/* ==========================================================================
   Revision engine — Labs C1–C3 (Section, Spine, Home, Sections map, Cover).
   All rules are scoped under body.labs-on / body.labs-* so Classic stays
   identical when Labs is off. Tokens match assets/template/DESIGN.md.
   ========================================================================== */

/* Shell rules for Labs views: keep phone bottom bar through 1023px */
body.labs-cover .rail,
body.labs-home .rail,
body.labs-sections .rail,
body.labs-section .rail,
body.labs-practice .rail,
body.labs-exam .rail,
body.labs-mock .rail {
  display: none;
}

@media (max-width: 1023px) {
  body.labs-on .rail {
    display: none;
  }
  body.labs-cover .top,
  body.labs-home .top,
  body.labs-sections .top,
  body.labs-section .top,
  body.labs-practice .top,
  body.labs-exam .top,
  body.labs-mock .top {
    display: none;
  }
  body.labs-on .bnav {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
  body.labs-on #main {
    margin-left: 0;
    padding-bottom: calc(6.5rem + env(safe-area-inset-bottom, 0px));
  }
  /* Leave scroll room below the bottom bar + .fabs stack so final options can scroll clear */
  body.labs-on:not(.labs-cover) #main {
    padding-bottom: calc(12rem + env(safe-area-inset-bottom, 0px));
  }
  body.labs-cover #main,
  body.labs-home #main,
  body.labs-sections #main,
  body.labs-section #main,
  body.labs-practice #main,
  body.labs-exam #main,
  body.labs-mock #main {
    padding-top: 0;
    padding-left: 0;
    padding-right: 0;
  }
}

/* Selection Shape Rule on Labs 5-slot bottom bar */
.bnav.labs-bnav button[aria-current="page"] {
  color: var(--ink);
  font-weight: 600;
  box-shadow: inset 0 -2px 0 var(--accent);
  border-radius: var(--r3) var(--r3) 0 0;
}

.bnav.labs-bnav .bnind {
  display: none;
}

body.labs-section .wrap,
body.labs-practice .wrap {
  max-width: 48rem;
  padding-top: 0;
}

body.labs-cover .wrap,
body.labs-home .wrap,
body.labs-sections .wrap {
  max-width: 46rem;
  padding-top: 0;
}

.section-page {
  min-width: 0;
  max-width: 100%;
}

.labs-sr {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

#section-page:focus:not(:focus-visible) {
  outline: none;
}

.labs-spine,
.labs-drawer,
.drawerbtn {
  display: none;
}

/* Sticky section header: back + title + Read · Check · Keep progress */
.sechead {
  position: sticky;
  top: 0;
  z-index: 25;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  margin: 0 calc(-1 * var(--pad, 1rem)) 1rem;
  padding: 0.5rem var(--pad, 1rem) 0.5rem;
}

.sechead-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
}

.sechead-back,
.sechead-nav {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  min-height: 2.75rem;
  min-width: 2.75rem;
  padding: 0 0.65rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--surface);
  color: var(--ink);
  font-family: var(--ui);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  flex-shrink: 0;
}

.sechead-back:hover,
.sechead-nav:hover {
  border-color: var(--line2);
  background: var(--surface2);
}

.sechead-id {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--ink2);
  background: var(--surface2);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 0.2rem 0.45rem;
  flex-shrink: 0;
}

.sechead-title {
  margin: 0;
  font-size: 0.9375rem;
  font-weight: 650;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
  flex: 1;
}

.progress3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.375rem;
  margin-top: 0.375rem;
}

.p3 {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.25rem;
  min-height: 2.75rem;
  padding: 0.3rem 0.5rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--surface);
  color: var(--ink2);
  font-family: var(--ui);
  font-size: 0.75rem;
  text-align: left;
  cursor: pointer;
  min-width: 0;
}

.p3:hover {
  border-color: var(--line2);
  color: var(--ink);
}

.p3.is-active {
  border-color: var(--accent);
  color: var(--ink);
  background: var(--surface2);
}

.p3.is-done {
  border-color: var(--good-line);
  color: var(--good-ink);
}

.p3top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.25rem;
  min-width: 0;
}

.p3name {
  font-weight: 650;
  color: var(--ink);
}

.p3val {
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--ink2);
  white-space: nowrap;
}

.p3bar {
  display: block;
  width: 100%;
  height: 0.25rem;
  background: var(--surface3);
  border-radius: 999px;
  overflow: hidden;
}

.p3bar > i {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 999px;
  transition: width var(--d2) var(--ease);
}

.p3.is-done .p3bar > i {
  background: var(--good);
}

/* Section hero + compact section switcher */
.section-hero {
  padding: 0.5rem 0 1.25rem;
  border-bottom: 1px solid var(--line);
}

.section-title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 4.5vw, 2.125rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 750;
  color: var(--ink);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  margin-bottom: 0.75rem;
  font-size: 0.875rem;
  color: var(--ink2);
}

.hero-ch {
  font-weight: 600;
  color: var(--ink);
}

.hero-min,
.hero-cnt {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--ink2);
}

.section-lede {
  margin: 0 0 0.875rem;
  font-family: var(--prose);
  font-size: 1.0625rem;
  line-height: 1.55;
  color: var(--ink2);
  max-width: 68ch;
}

.head-marks {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.sec-marks {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
}

.sec-mk {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink2);
  font-size: 0.75rem;
  font-weight: 600;
}

.sec-mk svg {
  width: 0.875rem;
  height: 0.875rem;
  flex-shrink: 0;
}

.sec-mk.on {
  border-color: var(--good-line);
  background: var(--good-soft);
  color: var(--good-ink);
}

.sec-mk.solid.on {
  border-color: var(--brass-line);
  background: var(--brass-soft);
  color: var(--brass-ink);
}

/* Optional section switcher drawer/bar */
.sec-navwrap {
  margin: 0.75rem 0 0.25rem;
}

.sec-navwrap > summary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  min-height: 2.75rem;
  padding: 0 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--surface);
  color: var(--ink);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

.sec-navwrap > summary::-webkit-details-marker {
  display: none;
}

.sec-navlist {
  display: grid;
  gap: 0.375rem;
  margin-top: 0.5rem;
  padding: 0.625rem;
  border: 1px solid var(--line);
  border-radius: var(--r2);
  background: var(--surface);
}

.sec-navch {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--ink2);
  margin: 0.25rem 0 0.125rem;
}

.sec-navbtn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  width: 100%;
  min-height: 2.75rem;
  padding: 0.45rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--surface2);
  color: var(--ink);
  font-size: 0.875rem;
  text-align: left;
  cursor: pointer;
}

.sec-navbtn[aria-current="true"] {
  border-color: var(--accent);
  border-width: 2px;
  background: var(--accent-soft);
  font-weight: 650;
}

.sec-navid {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink2);
  flex-shrink: 0;
}

/* Pre-beat content (callouts between lede and first h4) */
.section-pre {
  margin-top: 1.25rem;
}

/* Beats and prose */
.beat {
  padding-top: 1.5rem;
  margin-top: 1.5rem;
  border-top: 1px solid var(--line);
  scroll-margin-top: 7.25rem;
}

.beat:first-of-type {
  border-top: 0;
  margin-top: 0.5rem;
}

.beat-head {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.beat-num {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--ink2);
  flex-shrink: 0;
}

.beat-title {
  margin: 0;
  font-size: 1.25rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
  font-weight: 700;
  color: var(--ink);
}

.beat.flashbeat {
  animation: labs-beat-flash var(--d3) var(--ease);
}

@keyframes labs-beat-flash {
  0% { background: var(--accent-soft); }
  100% { background: transparent; }
}

.section-prose {
  font-family: var(--prose);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--ink);
  max-width: 68ch;
  min-width: 0;
  overflow-wrap: anywhere;
}

@media (min-width: 1024px) {
  .section-prose {
    font-size: 1.125rem;
  }
}

.section-prose h4 {
  margin: 1.25rem 0 0.5rem;
  font-family: var(--ui);
  font-size: 1.0625rem;
  line-height: 1.35;
}

.section-prose p,
.section-prose ul,
.section-prose ol {
  margin: 0 0 0.85rem;
}

.section-prose ul,
.section-prose ol {
  padding-left: 1.35rem;
}

.section-prose figure.fig {
  max-width: 100%;
  margin: 1rem 0;
}

.section-prose figure.fig img,
.section-prose figure.fig svg {
  max-width: 100%;
  height: auto;
}

.section-prose .tscroll {
  overflow-x: auto;
  max-width: 100%;
  margin: 0.75rem 0;
}

.section-prose details.try {
  margin: 1rem 0;
  border: 1px solid var(--line);
  border-radius: var(--r2);
  background: var(--surface);
  padding: 0.25rem 0.875rem;
}

.section-prose details.try > summary {
  display: flex;
  align-items: center;
  min-height: 2.75rem;
  font-family: var(--ui);
  font-size: 0.9375rem;
  font-weight: 650;
  color: var(--ink);
  cursor: pointer;
}

/* Inline checks */
.checkblock {
  margin: 1.25rem 0;
}

.qcard {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r2);
  padding: 1rem;
  min-width: 0;
}

.qcard.is-right {
  border-color: var(--good-line);
}

.qcard.is-wrong {
  border-color: var(--bad-line);
}

.qcard.is-part {
  border-color: var(--brass-line);
}

.qcard-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.qcard-meta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink2);
}

.qcard-badge {
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface2);
  color: var(--ink2);
  font-family: var(--ui);
  font-size: 0.75rem;
  font-weight: 600;
}

.qcard-badge.good {
  border-color: var(--good-line);
  background: var(--good-bg);
  color: var(--good);
}

.qcard-badge.bad {
  border-color: var(--bad-line);
  background: var(--bad-bg);
  color: var(--bad);
}

.qcard-badge.part {
  border-color: var(--brass-line);
  background: var(--brass-bg);
  color: var(--brass);
}

.qcard-flag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  min-width: 2.75rem;
  padding: 0 0.5rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--surface2);
  color: var(--ink2);
  font-size: 0.8125rem;
  cursor: pointer;
}

.qcard-flag[aria-pressed="true"] {
  border-color: var(--brass-line);
  background: var(--brass-bg);
  color: var(--brass);
  font-weight: 650;
}

.qstem {
  margin: 0.625rem 0 0.875rem;
  font-family: var(--prose);
  font-size: 1.0625rem;
  line-height: 1.55;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.qcard .opts {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* Override Classic app.css 4px inset stripe on .opt — DESIGN.md uses shape, not stripe */
body.labs-on .qcard .opt {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  width: 100%;
  min-height: 2.75rem;
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--surface2);
  color: var(--ink);
  font-family: var(--ui);
  font-size: 0.9375rem;
  line-height: 1.4;
  text-align: left;
  cursor: pointer;
  box-shadow: none;
  transition: border-color var(--d1) var(--ease), background-color var(--d1) var(--ease);
}

body.labs-on .qcard .opt:hover:not(:disabled) {
  border-color: var(--line2);
}

body.labs-on .qcard .opt:disabled {
  cursor: default;
}

body.labs-on .qcard .opt.sel {
  border-color: var(--accent);
  border-width: 2px;
  background: var(--accent-soft);
  box-shadow: none;
}

body.labs-on .qcard .opt.right {
  border-color: var(--good-line);
  border-width: 2px;
  background: var(--good-bg);
  box-shadow: none;
}

body.labs-on .qcard .opt.wrong {
  border-color: var(--bad-line);
  border-width: 2px;
  background: var(--bad-bg);
  box-shadow: none;
}

body.labs-on .qcard .opt.missed {
  border-color: var(--good-line);
  border-style: dashed;
  border-width: 2px;
  background: var(--surface2);
  box-shadow: none;
}

.qcard .opt .ind {
  width: 1.375rem;
  height: 1.375rem;
  flex: 0 0 1.375rem;
  border: 2px solid var(--line2);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--surface);
  color: transparent;
}

.qcard .opt[role="checkbox"] .ind {
  border-radius: 4px;
}

.qcard .opt .ind svg {
  width: 0.875rem;
  height: 0.875rem;
}

.qcard .opt.sel .ind {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
}

.qcard .opt.sel[role="radio"] .ind::after {
  content: "";
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--accent-ink);
}

.qcard .opt.right .ind {
  border-color: var(--good);
  background: var(--good);
  color: #fff;
}

.qcard .opt.wrong .ind {
  border-color: var(--bad);
  background: var(--bad);
  color: #fff;
}

.qcard .opt.missed .ind {
  border-color: var(--good);
  background: var(--surface);
  color: var(--good-ink);
}

.opt-txt {
  flex: 1;
  min-width: 0;
  overflow-wrap: anywhere;
}

/* Compact non-choice check inputs inside .qcard */
.qnum-row,
.qmatch-row,
.qorder-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

.qfield {
  min-height: 2.75rem;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--line2);
  border-radius: var(--r);
  background: var(--surface2);
  color: var(--ink);
  font-family: var(--ui);
  font-size: 1rem;
  max-width: 100%;
}

.qfield-num {
  width: 9rem;
}

.qfield-wide {
  width: 100%;
  min-height: 5.5rem;
  resize: vertical;
}

.qmatch-row {
  justify-content: space-between;
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--surface2);
}

.qmatch-left {
  font-size: 0.9375rem;
  font-weight: 500;
  min-width: 0;
  flex: 1 1 9rem;
}

.qorder-row {
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--surface2);
}

.qorder-txt {
  flex: 1;
  min-width: 0;
  font-size: 0.9375rem;
}

.qorder-btns {
  display: inline-flex;
  gap: 0.25rem;
}

.qorder-mv {
  min-width: 2.75rem;
  min-height: 2.75rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--surface);
  color: var(--ink);
  font-weight: 650;
  cursor: pointer;
}

.qcloze-wrap {
  font-family: var(--prose);
  font-size: 1.0625rem;
  line-height: 2.1;
}

.qcloze-wrap .qfield {
  display: inline-block;
  width: 9.5rem;
  margin: 0 0.2rem;
  vertical-align: middle;
}

.qactions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

body.labs-on .qcard .btn,
body.labs-section .doneblock .btn,
body.labs-section .keepzone .btn {
  min-height: 2.75rem;
  padding: 0.5rem 0.9rem;
}

/* Inline feedback + beat peek */
.qfb {
  margin-top: 0.875rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--line);
  font-size: 0.9375rem;
  line-height: 1.5;
}

.qfb-verdict {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.qfb-verdict.good {
  color: var(--good);
}

.qfb-verdict.bad {
  color: var(--bad);
}

.qfb-verdict.part {
  color: var(--brass);
}

.qfb-verdict svg {
  width: 1rem;
  height: 1rem;
}

.qfb-ans {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--ink2);
  margin: 0.25rem 0 0.4rem;
}

.qfb-why {
  font-family: var(--prose);
  color: var(--ink);
  margin: 0.25rem 0;
}

.qfb-ox {
  font-size: 0.875rem;
  color: var(--ink2);
  margin: 0.25rem 0;
}

.qfb-work {
  font-family: var(--mono);
  font-size: 0.8125rem;
  background: var(--surface2);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 0.5rem 0.65rem;
  margin: 0.4rem 0;
  overflow-x: auto;
}

.peek {
  margin-top: 0.75rem;
  border: 1px solid var(--line2);
  border-radius: var(--r);
  background: var(--surface2);
  padding: 0.65rem 0.75rem;
}

.peek-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.peek-label {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--ink);
}

.peek-body {
  margin-top: 0.4rem;
  font-family: var(--prose);
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--ink2);
}

.peek-jump {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  min-height: 2.75rem;
  padding: 0 0.65rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--surface);
  color: var(--accent);
  font-family: var(--ui);
  font-size: 0.8125rem;
  font-weight: 650;
  cursor: pointer;
}

/* Done reading block */
.doneblock {
  margin-top: 1.75rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--r2);
  background: var(--surface);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.doneblock.isseen {
  border-color: var(--good-line);
  background: var(--good-soft);
}

.done-copy {
  min-width: 0;
  flex: 1 1 12rem;
}

.done-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

.done-sub {
  margin: 0.2rem 0 0;
  font-size: 0.875rem;
  color: var(--ink2);
}

.seenbadge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  min-height: 2.75rem;
  padding: 0 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--good-line);
  background: var(--surface);
  color: var(--good-ink);
  font-size: 0.875rem;
  font-weight: 650;
}

.seenbadge svg {
  width: 1rem;
  height: 1rem;
}

/* Keep zone: Cards, Formulas, Traps */
.keepzone {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  scroll-margin-top: 7.25rem;
}

.keep-title {
  margin: 0 0 0.25rem;
  font-size: 1.25rem;
  font-weight: 750;
  color: var(--ink);
}

.keep-sub {
  margin: 0 0 1rem;
  font-size: 0.875rem;
  color: var(--ink2);
}

.keep-group {
  margin-top: 1.25rem;
}

.keep-h {
  margin: 0 0 0.625rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

.kdeck {
  display: grid;
  gap: 0.75rem;
}

.kcard {
  border: 1px solid var(--line);
  border-radius: var(--r2);
  background: var(--surface);
  padding: 0.875rem 1rem;
}

.kcard.is-knew {
  border-color: var(--good-line);
}

.kcard.is-miss {
  border-color: var(--brass-line);
}

.kcard-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}

.kcard-k {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--ink);
}

.kcard-status {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink2);
}

.kcard-front {
  font-family: var(--prose);
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--ink2);
}

.kcard-back {
  margin-top: 0.625rem;
  padding-top: 0.625rem;
  border-top: 1px dashed var(--line2);
  font-family: var(--prose);
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--ink);
}

.kcard-acts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.625rem;
}

.fitems,
.traps {
  display: grid;
  gap: 0.625rem;
}

.fitem,
.trapitem {
  border: 1px solid var(--line);
  border-radius: var(--r2);
  background: var(--surface);
  padding: 0.75rem 0.875rem;
}

.fitem-name {
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--ink);
  margin-bottom: 0.25rem;
}

.fitem-eq {
  font-family: var(--mono);
  font-size: 0.875rem;
  background: var(--surface2);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 0.4rem 0.6rem;
  margin: 0.25rem 0;
  overflow-x: auto;
}

.fitem-note {
  font-size: 0.875rem;
  color: var(--ink2);
}

.trapitem {
  border-color: var(--bad-line);
  background: var(--bad-soft);
  color: var(--ink);
  font-family: var(--prose);
  font-size: 0.9375rem;
  line-height: 1.5;
}

.trapitem > p:last-child {
  margin-bottom: 0;
}

/* Sources footer & Prev/Next links */
.section-sources {
  margin-top: 1.75rem;
  padding-top: 0.875rem;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--ink3);
  overflow-wrap: anywhere;
}

.nextsec {
  margin-top: 1.25rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
  gap: 0.625rem;
}

.nextsec-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 0.15rem;
  min-height: 2.75rem;
  padding: 0.65rem 0.875rem;
  border: 1px solid var(--line);
  border-radius: var(--r2);
  background: var(--surface);
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}

.nextsec-btn.is-next {
  align-items: flex-end;
  text-align: right;
}

.nextsec-btn:hover {
  border-color: var(--line2);
  background: var(--surface2);
}

.nextsec-dir {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink2);
}

.nextsec-name {
  font-size: 0.9375rem;
  font-weight: 650;
  color: var(--ink);
}

/* Formula enrichment inside Keep (shared by inline Keep & desktop drawer) */
.fitem-say {
  margin: 0 0 0.35rem;
  font-family: var(--prose);
  font-size: 0.9375rem;
  line-height: 1.45;
  color: var(--ink2);
}

.fitem-sym {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.2rem 0.625rem;
  margin: 0.45rem 0;
  font-size: 0.8125rem;
  color: var(--ink2);
}

.fitem-sy {
  font-family: var(--mono);
  font-weight: 700;
  color: var(--ink);
}

/* ==========================================================================
   C3 — Marks, In-app notice, Cover, Home (Quick 5), Sections map
   ========================================================================== */

.labs-marks {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

/* Distinct shapes per mark: seen (circle + dot), checked (rounded square + tick), solid (diamond) */
.labs-mk {
  position: relative;
  width: 13px;
  height: 13px;
  border: 1.25px solid var(--line);
  background: var(--surface);
  color: var(--ink3);
  display: grid;
  place-items: center;
  flex: none;
}

.labs-mk.seen {
  border-radius: 50%;
}

.labs-mk.seen.on {
  border-color: var(--good);
  background: var(--good-bg);
}

.labs-mk.seen.on::after {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--good);
}

.labs-mk.checked {
  border-radius: 3px;
}

.labs-mk.checked svg,
.labs-mk.solid svg {
  width: 8px;
  height: 8px;
  opacity: 0;
}

.labs-mk.checked.on {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
}

.labs-mk.checked.on svg {
  opacity: 1;
}

.labs-mk.solid {
  border-radius: 2px;
  transform: rotate(45deg) scale(0.86);
}

.labs-mk.solid svg {
  transform: rotate(-45deg);
}

.labs-mk.solid.on {
  border-color: var(--brass);
  background: var(--brass-bg);
  color: var(--brass);
}

.labs-mk.solid.on svg {
  opacity: 1;
}

.labs-notice {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.875rem 1rem;
  margin-bottom: 1rem;
  border: 1px solid var(--brass-line);
  border-radius: var(--r2);
  background: var(--brass-bg);
  color: var(--ink);
}

.labs-notice-body strong {
  display: block;
  font-size: 0.875rem;
  margin-bottom: 0.2rem;
}

.labs-notice-body p {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.45;
  color: var(--ink2);
}

.labs-dayschip {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.625rem;
  border: 1px solid var(--accent-line);
  border-radius: 999px;
  background: var(--accent-soft);
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
}

/* Cover (first open) */
.labs-cover-wrap {
  padding: 1.5rem 1rem 2rem;
}

.labs-cover {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: clamp(1.375rem, 4vw, 2.25rem);
}

.labs-cover-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.875rem;
}

.labs-brand-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: var(--r3);
  background: var(--bg);
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--ink2);
}

.labs-cover-title {
  margin: 0 0 0.625rem;
  font-family: var(--prose);
  font-size: clamp(1.5rem, 4.5vw, 2.125rem);
  font-weight: 600;
  line-height: 1.2;
  color: var(--ink);
}

.labs-cover-sub {
  margin: 0 0 1.25rem;
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--ink2);
  max-width: 54ch;
}

.labs-cover-acts {
  display: grid;
  gap: 0.625rem;
  margin-bottom: 1.25rem;
}

.labs-cover-cta {
  width: 100%;
  min-height: 2.875rem;
  justify-content: center;
}

.labs-cover-sec {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.labs-cover-sec .btn {
  flex: 1 1 8.5rem;
  min-height: 2.75rem;
}

.labs-tickrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem;
}

.labs-tick {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  border: 1px solid var(--line);
  background: var(--surface2);
}

.labs-tick.is-seen {
  border-color: var(--good);
  background: var(--good-bg);
}

.labs-tick.is-solid {
  border-color: var(--brass);
  background: var(--brass);
}

.labs-tick-more {
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--ink3);
  margin-left: 0.2rem;
}

/* Home */
.labs-home {
  padding: 1.25rem 1rem 2rem;
}

.labs-home-head {
  margin-bottom: 1rem;
}

.labs-home-titlebar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.labs-home-titlebar h1 {
  margin: 0;
  font-family: var(--prose);
  font-size: clamp(1.375rem, 4vw, 1.875rem);
  font-weight: 600;
  line-height: 1.2;
}

.labs-nextcard {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 1.125rem;
  margin-bottom: 0.875rem;
}

.labs-next-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.45rem;
}

.labs-next-kicker {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
}

.labs-next-title {
  margin: 0 0 0.25rem;
  font-family: var(--prose);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--ink);
}

.labs-next-meta {
  display: block;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink3);
  margin-bottom: 0.45rem;
}

.labs-why {
  margin: 0 0 0.875rem;
  font-size: 0.9375rem;
  line-height: 1.45;
  color: var(--ink2);
}

.labs-next-acts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.labs-next-cta {
  min-height: 2.75rem;
}

.labs-quiet-stack,
.labs-quick5 {
  margin-bottom: 0.75rem;
}

.labs-quietrow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  width: 100%;
  min-height: 3.25rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--r2);
  background: var(--surface);
  color: var(--ink);
  font-family: var(--ui);
  text-align: left;
  cursor: pointer;
  transition: background var(--d1) var(--ease), border-color var(--d1) var(--ease);
}

.labs-quietrow:hover {
  background: var(--surface2);
  border-color: var(--ink3);
}

.labs-quiet-main {
  display: grid;
  gap: 0.125rem;
  min-width: 0;
}

.labs-quiet-main strong {
  font-size: 0.9375rem;
  font-weight: 600;
}

.labs-quiet-main span {
  font-size: 0.8125rem;
  color: var(--ink2);
}

.labs-quiet-act {
  flex: none;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
}

.labs-q5-panel {
  margin-top: 0.5rem;
  padding: 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--r2);
  background: var(--bg);
}

.labs-q5-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink2);
  margin-bottom: 0.5rem;
}

.labs-q5-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.labs-q5-nav .btn {
  min-height: 2.75rem;
}

.labs-home-foot {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line2);
  display: grid;
  gap: 0.5rem;
}

.labs-home-cov {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--ink3);
}

/* Sections map */
.labs-sections-page {
  padding: 1.25rem 1rem 2.5rem;
}

.labs-page-head {
  margin-bottom: 1.25rem;
}

.labs-page-head h1 {
  margin: 0 0 0.25rem;
  font-family: var(--prose);
  font-size: clamp(1.375rem, 4vw, 1.875rem);
  font-weight: 600;
}

.labs-page-sub {
  margin: 0 0 0.75rem;
  font-size: 0.875rem;
  color: var(--ink2);
}

.labs-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.75rem;
  font-size: 0.75rem;
  color: var(--ink2);
}

.labs-legend > span {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.labs-bankwrap {
  margin: 0.5rem 0;
}

.labs-bankhead {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--ink2);
  margin-bottom: 0.25rem;
}

.labs-bankn {
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--ink3);
}

.labs-bankbar {
  height: 5px;
  border-radius: 999px;
  background: var(--surface3);
  overflow: hidden;
}

.labs-bankbar > i {
  display: block;
  height: 100%;
  background: var(--accent);
}

.labs-map-ch {
  margin-bottom: 1.5rem;
}

.labs-chaphead {
  margin-bottom: 0.5rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid var(--line);
}

.labs-ch-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
}

.labs-chaphead h2,
.labs-band-head h2 {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

.labs-chstat {
  flex: none;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink3);
}

.labs-chintro {
  margin: 0.25rem 0 0.45rem;
  font-size: 0.875rem;
  line-height: 1.45;
  color: var(--ink2);
}

.labs-band-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px dashed var(--line);
}

.labs-band-head span {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink3);
}

.labs-map-list {
  display: grid;
  gap: 0.4rem;
}

.labs-map-row {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  width: 100%;
  min-height: 2.875rem;
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--r2);
  background: var(--surface);
  color: var(--ink);
  font-family: var(--ui);
  text-align: left;
  cursor: pointer;
  transition: background var(--d1) var(--ease), border-color var(--d1) var(--ease);
}

.labs-map-row.is-class {
  border-style: dashed;
}

.labs-map-row:hover {
  background: var(--surface2);
  border-color: var(--ink3);
}

.labs-map-id {
  flex: none;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--ink3);
  min-width: 2.25rem;
}

.labs-map-body {
  flex: 1;
  min-width: 0;
  display: grid;
  gap: 0.125rem;
}

.labs-map-title {
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.3;
  overflow-wrap: anywhere;
}

.labs-map-meta {
  font-size: 0.75rem;
  color: var(--ink3);
}

.labs-classtag {
  display: inline-block;
  margin-left: 0.35rem;
  padding: 0.05rem 0.35rem;
  border: 1px dashed var(--line);
  border-radius: var(--r3);
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--ink2);
  vertical-align: middle;
}

/* ==========================================================================
   C2 — Desktop section layout (>= 1024px) + Right drawer (>= 1440px)
   ========================================================================== */

@media (min-width: 1024px) {
  body.labs-home,
  body.labs-sections,
  body.labs-section,
  body.labs-practice,
  body.labs-exam,
  body.labs-mock {
    --rail: 304px;
  }

  body.labs-cover .top,
  body.labs-cover .bnav,
  body.labs-home .top,
  body.labs-home .bnav,
  body.labs-sections .top,
  body.labs-sections .bnav,
  body.labs-section .top,
  body.labs-section .bnav,
  body.labs-practice .top,
  body.labs-practice .bnav,
  body.labs-exam .top,
  body.labs-exam .bnav,
  body.labs-mock .top,
  body.labs-mock .bnav,
  body.labs-section .sec-navwrap,
  body.labs-section .sechead-back {
    display: none;
  }

  body.labs-home #main,
  body.labs-sections #main,
  body.labs-section #main,
  body.labs-practice #main,
  body.labs-exam #main,
  body.labs-mock #main {
    margin-left: var(--rail);
    padding: 0;
    min-width: 0;
  }

  body.labs-cover #main {
    margin-left: 0;
    padding: 0;
    min-width: 0;
  }

  body.labs-section .wrap {
    max-width: none;
    margin: 0;
    padding: 0;
  }

  body.labs-home .wrap,
  body.labs-sections .wrap,
  body.labs-practice .wrap,
  body.labs-exam .wrap,
  body.labs-mock .wrap {
    max-width: 52rem;
    margin: 0;
    padding: 2rem clamp(1.5rem, 3.6vw, 4.5rem) 4rem;
  }

  body.labs-mock .wrap {
    max-width: 54rem;
  }

  body.labs-cover .wrap {
    max-width: 44rem;
    margin: 0 auto;
    padding: 3rem 1.5rem 4rem;
  }

  body.labs-section .sechead {
    margin: 0 0 1.25rem;
    padding: 0.75rem clamp(1.5rem, 3.6vw, 4.5rem) 0.625rem;
    z-index: 20;
    transition: padding-right var(--d3) var(--ease);
  }

  body.labs-section .sechead > * {
    max-width: 860px;
  }

  body.labs-section .section-body {
    padding: 0 clamp(1.5rem, 3.6vw, 4.5rem) 4rem;
    min-width: 0;
    transition: padding-right var(--d3) var(--ease);
  }

  body.labs-section .section-col {
    max-width: 860px;
    margin: 0;
    min-width: 0;
  }

  body.labs-section .section-hero {
    padding-top: 0.5rem;
  }

  body.labs-section .section-prose {
    font-size: 1.125rem;
    line-height: 1.7;
    max-width: 68ch;
  }

  /* Left spine (304px fixed navigation + section marks) */
  body.labs-home .labs-spine,
  body.labs-sections .labs-spine,
  body.labs-section .labs-spine,
  body.labs-practice .labs-spine,
  body.labs-exam .labs-spine,
  body.labs-mock .labs-spine {
    display: flex;
    flex-direction: column;
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--rail);
    background: var(--bg);
    border-right: 1px solid var(--line);
    z-index: 50;
    overflow: hidden;
  }

  .labs-spine-head {
    flex: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    padding: 1rem 1rem 0.75rem;
    border-bottom: 1px solid var(--line);
  }

  .labs-spbrand {
    min-width: 0;
  }

  .labs-spcode {
    font-family: var(--mono);
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    color: var(--ink3);
    text-transform: uppercase;
  }

  .labs-spname {
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--ink);
    line-height: 1.25;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .labs-spkbd {
    flex: none;
    font-family: var(--mono);
    font-size: 0.6875rem;
    color: var(--ink3);
    border: 1px solid var(--line);
    border-radius: var(--r3);
    padding: 0.15rem 0.4rem;
    background: var(--surface);
  }

  .labs-spnav {
    flex: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--line);
  }

  .labs-spnav-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 2.75rem;
    padding: 0 0.55rem;
    border: 1px solid transparent;
    border-radius: var(--r3);
    background: transparent;
    color: var(--ink2);
    font-family: var(--ui);
    font-size: 0.78125rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--d1) var(--ease), color var(--d1) var(--ease), border-color var(--d1) var(--ease);
  }

  .labs-spnav-btn:hover {
    background: var(--surface2);
    color: var(--ink);
  }

  .labs-spnav-btn.is-on,
  .labs-spnav-btn[aria-current="page"] {
    border-color: var(--accent-line);
    background: var(--accent-soft);
    color: var(--ink);
    font-weight: 700;
  }

  .labs-spsum-bank {
    margin-top: 0.35rem;
    margin-bottom: 0;
  }

  .labs-spch-class {
    border-bottom-style: dashed;
  }

  .labs-srow.is-class {
    border-style: dashed;
  }

  .labs-spine-sum {
    flex: none;
    padding: 0.625rem 1rem 0.5rem;
    border-bottom: 1px solid var(--line);
  }

  .labs-spsum-row {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.5rem;
    font-size: 0.75rem;
    color: var(--ink2);
    margin-bottom: 0.35rem;
  }

  .labs-spsum-row .mono {
    font-family: var(--mono);
    font-size: 0.6875rem;
    color: var(--ink3);
  }

  .labs-spbar {
    height: 4px;
    border-radius: 999px;
    background: var(--surface3);
    overflow: hidden;
  }

  .labs-spbar > i {
    display: block;
    height: 100%;
    background: var(--accent);
    transition: width var(--d3) var(--ease);
  }

  .labs-spine-body {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 0.5rem 0.625rem 1.25rem;
    scrollbar-width: thin;
    scrollbar-color: var(--line) transparent;
  }

  .labs-spch {
    font-family: var(--mono);
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    color: var(--ink3);
    padding: 0.75rem 0.45rem 0.35rem;
    border-bottom: 1px solid var(--line2);
    margin-bottom: 0.25rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .labs-srow {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.45rem;
    width: 100%;
    min-height: 2.75rem;
    padding: 0.4375rem 0.55rem 0.4375rem 0.65rem;
    margin: 0.125rem 0;
    border: 1px solid transparent;
    border-radius: var(--r2);
    background: transparent;
    color: var(--ink);
    font-family: var(--ui);
    text-align: left;
    cursor: pointer;
    transition: background var(--d1) var(--ease), border-color var(--d1) var(--ease);
  }

  .labs-srow:hover {
    background: var(--surface2);
    border-color: var(--line);
  }

  .labs-srow[aria-current="page"] {
    background: var(--accent-soft);
    border-color: var(--accent-line);
    padding-left: 1.15rem;
  }

  /* Geometric dot cue for current section (shape + hue, no side stripe) */
  .labs-srow[aria-current="page"]::before {
    content: "";
    position: absolute;
    left: 0.45rem;
    top: 50%;
    width: 0.4rem;
    height: 0.4rem;
    border-radius: 50%;
    transform: translateY(-50%);
    background: var(--accent);
  }

  .labs-srow-id {
    flex: none;
    font-family: var(--mono);
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--ink3);
    min-width: 2rem;
  }

  .labs-srow[aria-current="page"] .labs-srow-id {
    color: var(--accent);
  }

  .labs-srow-title {
    flex: 1;
    min-width: 0;
    font-size: 0.8125rem;
    font-weight: 500;
    line-height: 1.3;
    color: var(--ink2);
    overflow-wrap: anywhere;
  }

  .labs-srow[aria-current="page"] .labs-srow-title {
    font-weight: 700;
    color: var(--ink);
  }

  .labs-spine-foot {
    flex: none;
    display: flex;
    gap: 0.375rem;
    padding: 0.625rem 0.75rem;
    border-top: 1px solid var(--line);
  }

  .labs-spine-foot .btn {
    flex: 1;
    min-height: 2.75rem;
    justify-content: center;
    font-size: 0.78125rem;
    padding: 0 0.5rem;
  }
}

/* ==========================================================================
   Right drawer >= 1440px (Keep + Mistakes)
   ========================================================================== */

@media (min-width: 1440px) {
  body.labs-section .drawerbtn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    min-height: 2.75rem;
    padding: 0 0.75rem;
    border: 1px solid var(--line);
    border-radius: var(--r);
    background: var(--surface);
    color: var(--ink);
    font-family: var(--ui);
    font-size: 0.8125rem;
    font-weight: 650;
    cursor: pointer;
    flex-shrink: 0;
    transition: border-color var(--d1) var(--ease), background var(--d1) var(--ease);
  }

  body.labs-section .drawerbtn:hover {
    border-color: var(--line2);
    background: var(--surface2);
  }

  body.labs-section .drawerbtn[aria-expanded="true"] {
    border-color: var(--accent-line);
    background: var(--accent-soft);
  }

  .drawerbtn-cnt {
    font-family: var(--mono);
    font-size: 0.75rem;
    padding: 0.05rem 0.35rem;
    border-radius: 999px;
    border: 1px solid var(--bad-line);
    background: var(--bad-bg);
    color: var(--bad);
  }

  body.labs-section .labs-drawer {
    display: flex;
    flex-direction: column;
    position: fixed;
    right: 0;
    top: 0;
    bottom: 0;
    width: 380px;
    background: var(--surface);
    border-left: 1px solid var(--line);
    z-index: 45;
    box-shadow: var(--shadow-pop);
    visibility: hidden;
    pointer-events: none;
    transform: translateX(102%);
    transition: transform var(--d3) var(--ease), visibility 0s linear var(--d3);
  }

  body.labs-section.drawer-open .labs-drawer {
    visibility: visible;
    pointer-events: auto;
    transform: none;
    transition: transform var(--d3) var(--ease), visibility 0s;
  }

  body.labs-section.drawer-open .sechead,
  body.labs-section.drawer-open .section-body {
    padding-right: calc(380px + clamp(1.5rem, 3.6vw, 4.5rem));
  }

  body.labs-section.drawer-open .fabs,
  body.labs-section.drawer-open .updbar {
    right: calc(380px + 1.25rem);
  }

  .labs-drawer-head {
    flex: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1rem 0.75rem;
    border-bottom: 1px solid var(--line);
  }

  .labs-drawer-titles {
    flex: 1;
    min-width: 0;
  }

  .labs-drawer-sub {
    font-family: var(--mono);
    font-size: 0.6875rem;
    color: var(--ink3);
    text-transform: uppercase;
    letter-spacing: 0.04em;
  }

  .labs-drawer-title {
    margin: 0.1rem 0 0;
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--ink);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .labs-drawer-close {
    display: inline-grid;
    place-items: center;
    min-width: 2.75rem;
    min-height: 2.75rem;
    border: 1px solid var(--line);
    border-radius: var(--r);
    background: var(--bg);
    color: var(--ink2);
    cursor: pointer;
    flex: none;
  }

  .labs-drawer-close:hover {
    color: var(--ink);
    background: var(--surface2);
  }

  .labs-drawer-close svg {
    width: 1.125rem;
    height: 1.125rem;
  }

  .labs-drawer-body {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 1rem 1rem 2rem;
    scrollbar-width: thin;
    scrollbar-color: var(--line) transparent;
  }

  .drawer-sec {
    margin-bottom: 1.25rem;
  }

  .drawer-sec:last-child {
    margin-bottom: 0;
  }

  .drawer-sec-h {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    margin: 0 0 0.625rem;
    font-family: var(--mono);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--ink2);
    border-bottom: 1px solid var(--line);
    padding-bottom: 0.35rem;
  }

  .drawer-empty {
    border: 1px dashed var(--line);
    border-radius: var(--r2);
    padding: 0.75rem;
    font-size: 0.875rem;
    line-height: 1.45;
    color: var(--ink2);
    background: var(--bg);
  }

  .mistake-list {
    display: grid;
    gap: 0.625rem;
  }

  .mistake-item {
    border: 1px solid var(--bad-line);
    border-radius: var(--r2);
    background: var(--bg);
    overflow: hidden;
  }

  .mistake-item.is-fixed {
    border-color: var(--good-line);
  }

  .mistake-summary {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-height: 2.75rem;
    padding: 0.5rem 0.75rem;
    cursor: pointer;
    list-style: none;
    font-size: 0.875rem;
    color: var(--ink);
  }

  .mistake-summary::-webkit-details-marker {
    display: none;
  }

  .mistake-stem {
    flex: 1;
    min-width: 0;
    font-weight: 600;
    line-height: 1.35;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .mistake-tag {
    flex: none;
    font-family: var(--mono);
    font-size: 0.6875rem;
    font-weight: 700;
    padding: 0.125rem 0.4rem;
    border-radius: 999px;
    border: 1px solid var(--bad-line);
    background: var(--bad-bg);
    color: var(--bad);
  }

  .mistake-item.is-fixed .mistake-tag {
    border-color: var(--good-line);
    background: var(--good-bg);
    color: var(--good);
  }

  .mistake-body {
    padding: 0 0.625rem 0.625rem;
  }

  /* Compact qcard & kcard tuning inside narrow 380px drawer */
  .labs-drawer .qcard {
    padding: 0.75rem;
    background: var(--surface);
  }

  .labs-drawer .qcard-stem {
    font-size: 0.9375rem;
  }

  .labs-drawer .keep-group {
    margin-top: 0.75rem;
  }

  .labs-drawer .keep-h {
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
  }
}

/* ==========================================================================
   C4 — Practise (three doors, section filter sheet, details, swipe motion)
   ========================================================================== */

.qtop {
  gap: 0.45rem;
  flex-wrap: wrap;
}

.qno {
  font-weight: 700;
  color: var(--ink);
}

.qspacer {
  flex: 1;
}

.qlast {
  display: inline-flex;
  align-items: center;
  padding: 0.12rem 0.45rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface2);
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--ink2);
}

.qlast.is-warn {
  border-color: var(--brass-line);
  background: var(--brass-bg);
  color: var(--brass);
}

.qlast.is-good {
  border-color: var(--good-line);
  background: var(--good-bg);
  color: var(--good);
}

.qcard .dmeter {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
}

.qcard .dmeter > i {
  display: block;
  width: 0.35rem;
  height: 0.35rem;
  border-radius: 50%;
  background: var(--line2);
}

.qcard .dmeter > i.on {
  background: var(--ink2);
}

.qcard .opt .k {
  flex: none;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--ink3);
  min-width: 1rem;
  text-align: center;
}

.qcard .ex {
  margin: 0.5rem 0 0.75rem;
}

.qcloze-wrap .blank.ok,
.qcloze-wrap .blank.no {
  display: inline-block;
  padding: 0.08rem 0.4rem;
  border-radius: var(--r3);
  font-family: var(--mono);
  font-size: 0.9375rem;
  font-weight: 600;
}

.qcloze-wrap .blank.ok {
  border: 1px solid var(--good-line);
  background: var(--good-bg);
  color: var(--good);
}

.qcloze-wrap .blank.no {
  border: 1px solid var(--bad-line);
  background: var(--bad-bg);
  color: var(--bad);
  text-decoration: line-through;
}

/* Collapsed question metadata behind one summary line */
.qdetails {
  margin: 0.35rem 0 0.5rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.35rem;
}

.qdetails-sum {
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
  min-height: 2.25rem;
  padding: 0.25rem 0;
  cursor: pointer;
  list-style: none;
  color: var(--ink2);
  font-size: 0.8125rem;
  line-height: 1.35;
}

.qdetails-sum::-webkit-details-marker {
  display: none;
}

.qdetails-k {
  flex: none;
  font-weight: 650;
  color: var(--ink);
}

.qdetails-k::after {
  content: '▸';
  display: inline-block;
  margin-left: 0.3rem;
  color: var(--ink3);
  transition: transform var(--d1) var(--ease);
}

.qdetails[open] .qdetails-k::after {
  transform: rotate(90deg);
}

.qdetails-line {
  flex: 1;
  min-width: 0;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.qdetail-grid {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.25rem 0.75rem;
  margin: 0.35rem 0 0.25rem;
  font-size: 0.8125rem;
  line-height: 1.4;
}

.qdetail-grid dt {
  color: var(--ink3);
  font-weight: 600;
}

.qdetail-grid dd {
  margin: 0;
  color: var(--ink);
  overflow-wrap: anywhere;
}

/* Practise layout */
.pract-page {
  min-width: 0;
}

.pract-wrap {
  padding: 1rem 1rem 2rem;
  min-width: 0;
}

.pract-head h1 {
  margin: 0 0 0.2rem;
  font-family: var(--prose);
  font-size: 1.625rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.pract-head .lead {
  margin: 0 0 0.875rem;
  font-size: 0.9375rem;
  color: var(--ink2);
}

.doors {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
}

.door {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 0.2rem;
  min-height: 2.85rem;
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--surface);
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  transition: border-color var(--d1) var(--ease), background-color var(--d1) var(--ease);
}

.door:hover {
  border-color: var(--line2);
  background: var(--surface2);
}

.door.is-on {
  border-width: 2px;
  border-color: var(--accent);
  background: var(--accent-soft);
}

.door-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  width: 100%;
}

.door-lbl {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--ink);
}

.door-n {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.5rem;
  padding: 0.08rem 0.45rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg);
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--ink2);
}

.door.is-on .door-n {
  border-color: var(--accent-line);
  background: var(--accent);
  color: var(--accent-ink);
}

.door-meta {
  font-size: 0.75rem;
  color: var(--ink2);
  line-height: 1.3;
}

.doorwhy {
  margin: 0.625rem 0 0.75rem;
  font-size: 0.875rem;
  line-height: 1.45;
  color: var(--ink2);
}

.queuebar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 0.75rem;
  padding: 0.5rem 0;
  margin-bottom: 0.625rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.queuebar-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.65rem;
  min-width: 0;
}

.qpos {
  font-family: var(--mono);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--ink);
}

.qstat {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink2);
}

.queuebar-acts {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  max-width: 100%;
}

.qfilter {
  display: inline-flex;
  align-items: center;
  min-height: 2.375rem;
  max-width: 100%;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink);
  font-family: var(--ui);
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
}

.qfilter span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 14rem;
}

.qfilter::after {
  content: '▾';
  margin-left: 0.4rem;
  color: var(--ink3);
  font-size: 0.75rem;
}

.qfilter.is-filtered {
  border-color: var(--accent);
  border-width: 2px;
  background: var(--accent-soft);
}

.pract-scope {
  margin: 0 0 0.75rem;
  font-size: 0.8125rem;
  color: var(--ink2);
}

.pract-single-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  margin-bottom: 0.875rem;
}

.pract-single-lbl {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--ink2);
  padding: 0.15rem 0.5rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface2);
}

.qwrap {
  min-width: 0;
}

.qwrap.is-enter-next {
  animation: practFwd var(--d2) var(--ease);
}

.qwrap.is-enter-prev {
  animation: practBack var(--d2) var(--ease);
}

@keyframes practFwd {
  from { opacity: 0; transform: translateX(12px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes practBack {
  from { opacity: 0; transform: translateX(-12px); }
  to { opacity: 1; transform: translateX(0); }
}

.practfoot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-top: 0.875rem;
}

.practfoot .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  min-height: 2.75rem;
  min-width: 5.5rem;
}

.practfoot-mid {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--ink2);
}

.pract-kbd {
  display: none;
  margin: 0.625rem 0 0;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink3);
  text-align: center;
}

.pract-empty,
.queueend {
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--surface);
  padding: 1.25rem;
  margin-top: 0.5rem;
}

.pract-empty h2,
.queueend h2 {
  margin: 0 0 0.35rem;
  font-family: var(--prose);
  font-size: 1.25rem;
  color: var(--ink);
}

.pract-empty p,
.queueend p {
  margin: 0 0 0.875rem;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--ink2);
}

/* Section Filter Sheet inside #ovFilt.labs-filtsheet */
#ovFilt.labs-filtsheet .sheetp {
  max-height: 82vh;
  display: flex;
  flex-direction: column;
}

.sheetgrab {
  width: 2.25rem;
  height: 4px;
  border-radius: 999px;
  background: var(--line2);
  margin: 0 auto 0.75rem;
  flex: none;
}

.labs-fs-head {
  flex: none;
  margin-bottom: 0.5rem;
}

.labs-fs-head h2 {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 700;
}

.labs-fs-note {
  margin: 0 0 0.5rem;
  font-size: 0.8125rem;
  color: var(--ink2);
  flex: none;
}

.labs-fs-list {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding-bottom: 0.5rem;
}

.labs-fs-ch {
  margin: 0.65rem 0 0.25rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--ink2);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.frow {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  width: 100%;
  min-height: 2.75rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--r2);
  background: var(--surface);
  color: var(--ink);
  font-family: var(--ui);
  font-size: 0.9375rem;
  text-align: left;
  cursor: pointer;
}

.frow:hover {
  border-color: var(--line2);
  background: var(--surface2);
}

.frow.is-on {
  border-width: 2px;
  border-color: var(--accent);
  background: var(--accent-soft);
  font-weight: 600;
}

.frow-ind {
  width: 1.25rem;
  height: 1.25rem;
  flex: none;
  border: 2px solid var(--line2);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--surface);
  color: var(--accent-ink);
}

.frow.is-on .frow-ind {
  border-color: var(--accent);
  background: var(--accent);
}

.frow-ind svg {
  width: 0.85rem;
  height: 0.85rem;
}

.frow-txt {
  flex: 1;
  min-width: 0;
  overflow-wrap: anywhere;
}

.frow-n {
  flex: none;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink2);
}

@media (min-width: 480px) {
  .doors {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 700px) {
  .sheetgrab {
    display: none;
  }
  .pract-wrap {
    padding: 1.5rem 1.25rem 3rem;
  }
}

@media (min-width: 1024px) {
  .pract-wrap {
    padding: 0;
  }
  .pract-kbd {
    display: block;
  }
}

/* ==========================================================================
   C5 — Exam hub, Mock runner & results, Cram sheet, Papers, Frameworks, Essay
   ========================================================================== */

.exam-page,
.mock-page,
.cram-page {
  min-width: 0;
}

.exam-head h1,
.subview-head h1,
.resulthead h1 {
  margin: 0 0 0.25rem;
  font-family: var(--prose);
  font-size: 1.625rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.exam-date {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.75rem;
  margin-bottom: 1rem;
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--ink2);
}

.exam-sub {
  margin: 0 0 0.875rem;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--ink2);
}

.exam-setup,
.exam-history,
.mk-sec-card,
.mk-review-card,
.resulthead {
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--surface);
  padding: 1rem 1rem 1.125rem;
  margin-bottom: 1rem;
  min-width: 0;
}

.exam-setup h2,
.exam-history h2,
.mk-sec-card h2,
.mk-review-head h2 {
  margin: 0 0 0.25rem;
  font-family: var(--prose);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink);
}

.exam-setup .form-row {
  margin-top: 0.875rem;
}

.exam-setup .chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
}

.exam-setup .seg,
.mk-review-ctrls .seg,
.subview-head .seg {
  display: inline-flex;
  flex-wrap: wrap;
  max-width: 100%;
}

.exam-setup .seg button,
.mk-review-ctrls .seg button,
.subview-head .seg button {
  min-height: 2.375rem;
}

body.labs-on .seg button[aria-pressed="true"],
body.labs-on .chip[aria-pressed="true"] {
  border-width: 2px;
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--ink);
  font-weight: 700;
}

.exam-row-inline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.625rem;
}

.exam-custom-num {
  width: 5.5rem;
  min-height: 2.375rem;
}

.exam-min-lbl {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.875rem;
  color: var(--ink2);
}

.exam-start-row {
  margin-top: 1.125rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.exam-start-row .btn {
  min-height: 2.75rem;
}

.exam-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13.5rem, 1fr));
  gap: 0.625rem;
  margin-bottom: 1rem;
}

.examdoor {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 0.25rem;
  min-height: 4.5rem;
  padding: 0.875rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--surface);
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  transition: border-color var(--d1) var(--ease), background-color var(--d1) var(--ease);
}

.examdoor:hover {
  border-color: var(--line2);
  background: var(--surface2);
}

.examdoor h3 {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

.examdoor p {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--ink2);
  line-height: 1.35;
}

.mockhist-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem 0.65rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.875rem;
}

.mockhist-row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

/* Active Mock Runner */
.mockbar {
  position: sticky;
  top: 0;
  z-index: 35;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  padding: 0.625rem 0 0;
  margin-bottom: 1rem;
}

.mockbar-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem 0.625rem;
  padding-bottom: 0.55rem;
}

.mockbar-time {
  display: inline-flex;
  align-items: baseline;
  gap: 0.375rem;
}

.mockbar-lbl {
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--ink3);
  text-transform: uppercase;
}

.mockbar-clock {
  font-family: var(--mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.mockbar-clock.is-low {
  color: var(--bad);
}

.mockbar-prog {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--ink2);
}

.mockbar-acts {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.375rem;
}

.mockbar-acts .btn {
  min-height: 2.375rem;
}

.mockbar-track {
  height: 3px;
  background: var(--surface3);
  border-radius: 999px;
  overflow: hidden;
}

.mockbar-track > i {
  display: block;
  height: 100%;
  background: var(--accent);
  transition: width var(--d2) var(--ease);
}

.mockbody,
.mockcol {
  min-width: 0;
}

.mockfoot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-top: 0.875rem;
}

.mockfoot .btn {
  min-height: 2.75rem;
  min-width: 5.5rem;
}

.mockfoot-pos {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--ink2);
}

#ovMkGrid .grid-nav button.cur {
  border-width: 2px;
  border-color: var(--accent);
  font-weight: 700;
}

#ovMkGrid .grid-nav button.ans {
  background: var(--accent-soft);
  border-color: var(--accent-line);
  color: var(--ink);
}

#ovMkGrid .grid-nav button.flg {
  box-shadow: inset 0 -2px 0 var(--brass);
}

/* Mock Results & Breakdown */
.mkres-meta {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink3);
  margin-bottom: 0.25rem;
}

.mkres-wrap {
  min-width: 0;
}

.resulthead .mkres {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem 1.75rem;
  margin: 0.75rem 0 1rem;
}

.mkstats {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.75rem;
}

.mkstats .n {
  font-family: var(--mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.mkstats .lbl {
  font-size: 0.75rem;
  color: var(--ink3);
}

.mkres-acts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.mkres-acts .btn {
  min-height: 2.75rem;
}

.mk-sec-list {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin-top: 0.625rem;
}

.mk-sec-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  width: 100%;
  min-height: 2.75rem;
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--r2);
  background: var(--bg);
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  transition: border-color var(--d1) var(--ease), background-color var(--d1) var(--ease);
}

.mk-sec-row:hover {
  border-color: var(--line2);
  background: var(--surface2);
}

.mk-sec-main {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  min-width: 0;
  flex: 1;
}

.mk-sec-name {
  font-size: 0.9375rem;
  font-weight: 650;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.mk-sec-sub {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink3);
}

.mk-sec-score {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  flex: none;
  font-family: var(--mono);
  font-size: 0.875rem;
  font-variant-numeric: tabular-nums;
}

.mk-sec-pct {
  font-weight: 700;
}

.mk-sec-pct.good {
  color: var(--good);
}

.mk-sec-pct.bad {
  color: var(--bad);
}

.mk-sec-go {
  color: var(--ink3);
}

.mk-review-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 0.75rem;
  margin-bottom: 0.75rem;
}

.mk-review-ctrls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.resultlist {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.875rem;
}

.rwrap {
  min-width: 0;
}

.rrow {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  width: 100%;
  min-height: 2.75rem;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--r2);
  background: var(--bg);
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}

.rrow:hover {
  border-color: var(--line2);
  background: var(--surface2);
}

.rrow.is-open {
  border-color: var(--accent-line);
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

.rrow-num {
  flex: none;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--ink3);
  min-width: 1.5rem;
}

.rrow-txt {
  flex: 1;
  min-width: 0;
  font-size: 0.875rem;
  line-height: 1.35;
  overflow-wrap: anywhere;
}

.rrow-card {
  border: 1px solid var(--accent-line);
  border-top: 0;
  border-bottom-left-radius: var(--r2);
  border-bottom-right-radius: var(--r2);
  padding: 0.5rem;
  background: var(--bg);
}

/* Subviews (Cram, Past papers, Frameworks, Essay drill) */
.subview-head {
  margin-bottom: 1rem;
}

.subview-head .sechead-back {
  display: inline-flex;
  margin-bottom: 0.5rem;
}

.subview-acts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.cramfilter,
.es-parts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.chip.weak {
  border-color: var(--brass-line);
}

.chip.weak[aria-pressed="true"] {
  border-width: 2px;
  border-color: var(--brass);
  background: var(--brass-bg);
}

.cramsec {
  margin-top: 1.25rem;
}

.cramsec h2 {
  margin: 0 0 0.625rem;
  font-family: var(--prose);
  font-size: 1.25rem;
  color: var(--ink);
}

.fgrid,
.ideagrid,
.trapgrid,
.pp-list,
.fw-list,
.es-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.625rem;
}

.fcard,
.ideacard,
.trapitem {
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--surface);
  padding: 0.875rem 1rem;
  min-width: 0;
}

.fcard-top,
.ideacard-top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.35rem 0.65rem;
  margin-bottom: 0.4rem;
}

.fcard-name {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

.fcard-f {
  font-family: var(--mono);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--r3);
  padding: 0.5rem 0.65rem;
  margin: 0.35rem 0 0.5rem;
  overflow-x: auto;
  overflow-wrap: anywhere;
}

.fcard-say,
.fcard-meta,
.ideacard-back {
  margin: 0.25rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--ink2);
  overflow-wrap: anywhere;
}

.fcard-meta b {
  color: var(--ink);
}

.fsym {
  margin: 0.4rem 0 0.25rem;
  padding-left: 1.15rem;
  font-size: 0.875rem;
  color: var(--ink2);
}

.ftrap {
  margin: 0.5rem 0 0;
  padding: 0.45rem 0.65rem;
  border: 1px solid var(--brass-line);
  border-radius: var(--r3);
  background: var(--brass-bg);
  font-size: 0.875rem;
  color: var(--ink);
}

.cram-syms {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.35rem 0.875rem;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--surface);
  padding: 0.875rem 1rem;
  margin: 0;
}

.cram-syms dt {
  font-family: var(--mono);
  font-weight: 700;
  color: var(--ink);
}

.cram-syms dd {
  margin: 0;
  color: var(--ink2);
  overflow-wrap: anywhere;
}

.trapitem {
  border-color: var(--brass-line);
  background: var(--brass-bg);
}

.trapitem-body {
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.trapitem-src,
.ideacard-sec {
  margin-top: 0.35rem;
}

.trapitem-lbl {
  display: inline-block;
  margin-top: 0.35rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink3);
}

.empty-cram {
  border: 1px dashed var(--line);
  border-radius: var(--r);
  padding: 1rem;
  font-size: 0.9375rem;
  color: var(--ink2);
  background: var(--surface);
}

.pp-row {
  flex-direction: row;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.625rem 1rem;
}

.pp-info {
  min-width: 0;
  flex: 1 1 12rem;
}

.pp-acts {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.pp-qs {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

@media (min-width: 700px) {
  .ideagrid,
  .trapgrid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ==========================================================================
   C6 — Settings (grouped summary -> phone drill-in, two-column desktop modal)
   ========================================================================== */
#setBody.labs-setp {
  padding: 0.625rem 0 0;
  max-height: 88vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#setBody.labs-setp .sheetgrab {
  margin-bottom: 0.5rem;
}

.labs-setp .sheet-h {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0;
}

.labs-setp .sheet-h .sh {
  flex: 1;
  min-width: 0;
}

.labs-setp .sheet-h h2 {
  margin: 0;
  font-family: var(--prose);
  font-size: 1.25rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.labs-setp .sheet-h .iconbtn {
  flex: none;
  width: 2.75rem;
  height: 2.75rem;
}

.labs-setp .btn.sm,
.labs-setp .seg button,
.labs-setp .chip {
  min-height: 2.375rem;
}

.labs-setp .input {
  min-height: 2.5rem;
}

.set-cols {
  display: flex;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.set-rail,
.set-detail {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.set-head {
  padding: 0 1.125rem 0.75rem;
  border-bottom: 1px solid var(--line2);
  flex: none;
  align-items: center;
}

.set-subhead h2 {
  font-size: clamp(1rem, 4.4vw, 1.1875rem);
  overflow-wrap: normal;
  word-break: normal;
}

.setback {
  padding-left: 0.375rem;
  padding-right: 0.5625rem;
  margin-left: -0.375rem;
  flex: none;
}

.setlist {
  overflow-y: auto;
  padding: 0.5rem 0.75rem calc(1.25rem + env(safe-area-inset-bottom));
  flex: 1;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.setbody {
  overflow-y: auto;
  padding: 0.875rem 1.125rem calc(1.5rem + env(safe-area-inset-bottom));
  flex: 1;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.setitem {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  text-align: left;
  padding: 0.625rem 0.75rem;
  min-height: 3.25rem;
  border: 1px solid transparent;
  border-radius: var(--r2);
  background: transparent;
  color: var(--ink);
  transition: background var(--d1) var(--ease), border-color var(--d1) var(--ease), transform var(--d1) var(--ease);
}

.setitem + .setitem {
  margin-top: 2px;
}

.setitem:hover {
  background: var(--surface2);
}

.setitem:active {
  transform: scale(0.99);
}

@media (min-width: 700px) {
  .setitem[aria-current="true"] {
    background: var(--accent-soft);
    border-color: var(--accent-line);
    font-weight: 600;
  }

  .setitem[aria-current="true"] .setitem-ic {
    background: var(--accent);
    color: var(--accent-ink);
  }

  .setitem.is-danger[aria-current="true"] {
    background: var(--bad-bg);
    border-color: var(--bad-line);
  }

  .setitem.is-danger[aria-current="true"] .setitem-ic {
    background: var(--bad);
    color: var(--surface);
  }
}

.setitem-ic {
  width: 2rem;
  height: 2rem;
  border-radius: var(--r3);
  background: var(--surface2);
  color: var(--accent);
  display: grid;
  place-items: center;
  flex: none;
}

.setitem.is-danger .setitem-ic {
  color: var(--bad);
  background: var(--bad-bg);
}

.setitem-ic svg {
  width: 1rem;
  height: 1rem;
}

.setitem-tx {
  flex: 1;
  min-width: 0;
  display: block;
}

.setitem-t {
  display: flex;
  align-items: center;
  gap: 0.4375rem;
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.25;
}

.setitem-s {
  display: block;
  font-size: 0.75rem;
  color: var(--ink3);
  font-weight: 400;
  margin-top: 2px;
  line-height: 1.35;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.setitem-arw {
  color: var(--ink3);
  flex: none;
  display: grid;
  place-items: center;
}

.setitem-arw svg {
  width: 0.9375rem;
  height: 0.9375rem;
}

.setitem-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--line);
  flex: none;
}

.setitem-dot.on {
  background: var(--good);
}

.setitem-dot.syncing {
  background: var(--accent);
}

.setitem-dot.error,
.setitem-dot.gone {
  background: var(--bad);
}

.setsep {
  height: 1px;
  background: var(--line2);
  margin: 0.5rem 0.25rem;
}

.setsep-lbl {
  font-family: var(--mono);
  font-size: 0.65625rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink3);
  padding: 0.625rem 0.75rem 0.25rem;
}

.labs-set-labs {
  padding: 0.625rem 0.75rem;
  border-bottom: 0;
}

@media (max-width: 699px) {
  #setBody.labs-setp[data-sub=""] .set-detail {
    display: none;
  }

  #setBody.labs-setp:not([data-sub=""]) .set-rail {
    display: none;
  }

  #setBody.labs-setp:not([data-sub=""]) .set-detail.slide-fwd {
    animation: setfwd var(--d2) var(--ease) both;
  }

  #setBody.labs-setp[data-sub=""] .set-rail.slide-back {
    animation: setback var(--d2) var(--ease) both;
  }
}

@keyframes setfwd {
  from { opacity: 0.4; transform: translateX(18px); }
  to { opacity: 1; transform: none; }
}

@keyframes setback {
  from { opacity: 0.4; transform: translateX(-14px); }
  to { opacity: 1; transform: none; }
}

@media (min-width: 700px) {
  #setBody.labs-setp {
    width: min(860px, 94vw);
    height: min(640px, 84vh);
    max-height: 84vh;
    padding: 0;
    border: 1px solid var(--line);
  }

  #setBody.labs-setp .sheetgrab {
    display: none;
  }

  .set-rail {
    flex: 0 0 18.5rem;
    border-right: 1px solid var(--line2);
    background: color-mix(in srgb, var(--bg) 55%, var(--surface));
  }

  .set-rail .set-head {
    padding: 1rem 1rem 0.75rem;
  }

  .set-rail .set-head .iconbtn {
    display: none;
  }

  .set-detail .set-head {
    padding: 1rem 1.25rem 0.75rem;
  }

  .setbody {
    padding: 1rem 1.25rem 1.375rem;
  }

  .setlist {
    padding: 0.625rem 0.625rem 1rem;
  }

  .setitem-arw {
    display: none;
  }
}

.setsub {
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink3);
  margin: 1.125rem 0 0.375rem;
}

.setnote {
  font-size: 0.78125rem;
  color: var(--ink3);
  line-height: 1.5;
  margin: 0.25rem 0 0.5rem;
}

.labs-setp .setrow {
  display: flex;
  align-items: center;
  gap: 0.5rem 0.75rem;
  flex-wrap: wrap;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--line2);
}

.labs-setp .setlist .labs-set-labs {
  padding: 0.5rem 0.75rem;
  border-bottom: 0;
}

.labs-setp .setrow:last-child {
  border-bottom: 0;
}

.labs-setp .setrow.off .st {
  color: var(--ink2);
}

.labs-setp .setrow > .grow {
  flex: 1 1 8rem;
  min-width: 0;
}

.labs-setp .setrow:has(> .tgl) > .grow {
  flex: 1 1 0;
}

.labs-setp .setrow.stack {
  flex-wrap: wrap;
}

.labs-setp .setrow.stack > .grow {
  flex: 1 1 100%;
}

.labs-setp .setrow .st {
  font-size: 0.875rem;
  font-weight: 600;
}

.labs-setp .setrow .sd {
  font-size: 0.78125rem;
  color: var(--ink3);
  margin-top: 2px;
  line-height: 1.42;
}

.labs-setp .setrow .seg,
.labs-setp .setrow .btn {
  flex: none;
}

.fspreview-card {
  border: 1px solid var(--line);
  background: var(--bg);
  border-radius: var(--r2);
  padding: 0.875rem;
  margin-bottom: 0.5rem;
}

.fsp-top {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.labs-setp .fsprev {
  font-family: var(--prose);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1;
  padding: 0.375rem 0.625rem;
  border-radius: var(--r3);
  background: var(--surface2);
  border: 1px solid var(--line);
  color: var(--ink);
  flex: none;
}

.fsp-copy {
  font-family: var(--prose);
  line-height: 1.55;
  color: var(--ink2);
  flex: 1;
  min-width: 0;
}

.fsp-copy b {
  color: var(--ink);
  font-weight: 600;
}

.fsp-meta {
  font-size: 0.6875rem;
  letter-spacing: 0.05em;
  color: var(--ink3);
  margin-top: 0.5rem;
}

.exrow {
  width: 100%;
  max-width: 22rem;
}

.exrow .input {
  flex: 1;
  min-width: 9rem;
}

.planline {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  border: 1px solid var(--accent-line);
  background: var(--accent-soft);
  border-radius: var(--r2);
  padding: 0.75rem 0.875rem;
  margin-bottom: 0.375rem;
}

.planline svg {
  width: 1.0625rem;
  height: 1.0625rem;
  color: var(--accent);
  flex: none;
  margin-top: 2px;
}

.pl-main {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.35;
}

.pl-sub {
  font-size: 0.78125rem;
  color: var(--ink2);
  margin-top: 2px;
  line-height: 1.4;
}

.syncbox {
  border: 1px solid var(--line);
  background: var(--bg);
  border-radius: var(--r2);
  padding: 0.875rem;
}

.syncbox.state-error,
.syncbox.state-gone {
  border-color: var(--bad-line);
  background: color-mix(in srgb, var(--bad-bg) 45%, var(--bg));
}

.syncbox.state-on {
  border-color: var(--good-line);
  background: color-mix(in srgb, var(--good-bg) 35%, var(--bg));
}

.syncbox-h {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
}

.sbt {
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.25;
}

.sbd {
  font-size: 0.8125rem;
  color: var(--ink2);
  line-height: 1.45;
  margin-top: 3px;
}

.labs-setp .syncdot {
  width: 0.625rem;
  height: 0.625rem;
  border-radius: 50%;
  background: var(--line);
  flex: none;
  margin-top: 5px;
}

.labs-setp .syncdot.ok {
  background: var(--good);
}

.labs-setp .syncdot.busy {
  background: var(--accent);
  animation: syncpulse 1s var(--ease) infinite;
}

.labs-setp .syncdot.err {
  background: var(--bad);
}

@keyframes syncpulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

.synccoderow {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 0.75rem;
}

.labs-setp .synccode {
  font-family: var(--mono);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 0.4375rem 0.6875rem;
  border-radius: var(--r3);
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  user-select: all;
}

.syncacts {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 0.75rem;
}

.syncjoin {
  margin-top: 0.875rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--line2);
}

.sjl {
  display: block;
  font-size: 0.78125rem;
  color: var(--ink3);
  margin-bottom: 0.375rem;
}

.labs-setp #syncIn {
  flex: 1 1 11rem;
  min-width: 0;
  max-width: 15.5rem;
  font-family: var(--mono);
  text-transform: uppercase;
}

.labs-setp .syncmsg {
  margin-top: 0.625rem;
  font-size: 0.8125rem;
  line-height: 1.4;
}

.labs-setp .syncmsg.bad {
  color: var(--bad);
  font-weight: 500;
}

.instbody {
  padding: 0.5rem 0 0.25rem;
}

.aboutmeta {
  display: grid;
  gap: 0.375rem;
  border: 1px solid var(--line2);
  border-radius: var(--r2);
  padding: 0.6875rem 0.8125rem;
  background: var(--bg);
}

.aboutmeta > div {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
  font-size: 0.8125rem;
  line-height: 1.4;
}

.aboutmeta span {
  color: var(--ink3);
}

.aboutmeta b {
  font-weight: 600;
  color: var(--ink);
  text-align: right;
  overflow-wrap: anywhere;
}

.dangerbox {
  margin-top: 1rem;
  border: 1px solid var(--bad-line);
  background: color-mix(in srgb, var(--bad-bg) 48%, var(--surface));
  border-radius: var(--r2);
  padding: 0.875rem;
}

.dangerbox .sd {
  font-size: 0.78125rem;
  color: var(--ink2);
  line-height: 1.45;
  margin-top: 0.25rem;
}

.danger {
  color: var(--bad);
}

.set-foot-note {
  font-size: 0.75rem;
  color: var(--ink3);
  line-height: 1.5;
  margin-top: 0.875rem;
}

/* ---------- C7 Search overlay, Install card, Update bar & FABs ---------- */
.fcard,
.ideacard,
.kcard,
.trapitem {
  scroll-margin-top: 7.25rem;
}

.labs-section .readbar {
  display: none;
}

body.labs-cover .fabs {
  display: none !important;
}

.labs-head-search {
  display: inline-grid;
  place-items: center;
  min-width: 2.75rem;
  min-height: 2.75rem;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink2);
  flex: none;
}

.labs-head-search:hover {
  color: var(--ink);
  border-color: var(--ink3);
}

.labs-head-search svg {
  width: 1.125rem;
  height: 1.125rem;
}

.labs-spine-foot .btn[data-act="search"] {
  display: inline-flex;
  align-items: center;
  gap: 0.4375rem;
  text-align: left;
}

.labs-spine-foot .btn[data-act="search"] svg {
  width: 0.9375rem;
  height: 0.9375rem;
  color: var(--ink3);
  flex: none;
}

.labs-spine-foot .btn[data-act="search"] .kbd {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 0.6875rem;
  padding: 0.0625rem 0.375rem;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--ink3);
  background: var(--bg);
}

@media (min-width: 1024px) {
  .labs-head-search {
    display: none;
  }
}

/* Search overlay (#ovSearch) aligned with DESIGN.md §9 & demo.css */
body.labs-on #ovSearch .searchp {
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  width: auto;
  max-height: 100vh;
  max-height: 100dvh;
  border-radius: 0;
  border: 0;
  transform: none;
  opacity: 0;
  padding: calc(env(safe-area-inset-top, 0px) + 0.375rem) 0 0;
  background: var(--surface);
  transition: opacity var(--d2) var(--ease);
}

body.labs-on #ovSearch.on .searchp {
  opacity: 1;
}

body.labs-on #ovSearch .sin {
  padding: 0.625rem 0.875rem;
  border-bottom: 1px solid var(--line);
}

body.labs-on #ovSearch .sres {
  padding: 0.375rem 0.5rem 1.5rem;
}

body.labs-on #ovSearch .sres button[data-act="s-go"] {
  border: 1px solid transparent;
  border-radius: var(--r3);
  min-height: 2.75rem;
  padding: 0.5625rem 0.625rem;
  transition: background var(--d1) var(--ease), border-color var(--d1) var(--ease);
}

body.labs-on #ovSearch .sres button[data-act="s-go"][aria-selected="true"] {
  background: var(--accent-soft);
  border-color: var(--accent-line);
  box-shadow: none;
}

body.labs-on #ovSearch .sfoot {
  padding: 0.5625rem 0.875rem calc(0.5625rem + env(safe-area-inset-bottom, 0px));
}

@media (min-width: 700px) {
  body.labs-on #ovSearch .searchp {
    left: 50%;
    right: auto;
    top: 8vh;
    bottom: auto;
    width: min(660px, 94vw);
    max-height: 78vh;
    border-radius: var(--r);
    border: 1px solid var(--line);
    padding: 0;
    transform: translate(-50%, 10px);
    transition: transform var(--d2) var(--ease), opacity var(--d2) var(--ease);
  }
  body.labs-on #ovSearch.on .searchp {
    transform: translate(-50%, 0);
  }
}

/* Install card in Home & Exam (#instSlot -> #instCard) */
body.labs-on #instCard {
  border: 1px solid var(--accent-line);
  border-radius: var(--r);
  background: var(--surface);
  padding: 1rem;
  margin: 0.75rem 0 1.25rem;
  box-shadow: none;
}

body.labs-on #instCard .eyebrow {
  display: none;
}

body.labs-on #instCard h2 {
  font-family: var(--prose);
  font-size: 1.0625rem;
  line-height: 1.3;
  margin: 0;
}

body.labs-on #instCard .instbtns {
  flex-wrap: wrap;
}

body.labs-on #instCard .btn {
  min-height: 2.75rem;
}

/* Update bar (#updBar) — 1 px accent border, no left stripe */
body.labs-on .updbar {
  border: 1px solid var(--accent-line);
  border-left: 1px solid var(--accent-line);
  border-radius: var(--r2);
  background: var(--surface);
  color: var(--ink);
  box-shadow: var(--shadow-pop);
  z-index: 60;
}

@media (max-width: 1023px) {
  body.labs-on .updbar {
    left: 0.75rem;
    right: 0.75rem;
    bottom: calc(env(safe-area-inset-bottom, 0px) + 5.25rem);
    max-width: none;
  }
  body.labs-on .fabs {
    right: 0.875rem;
    bottom: calc(env(safe-area-inset-bottom, 0px) + 4.875rem);
  }
  body.labs-on .fabsearch {
    display: grid;
  }
  body.labs-on .toast {
    bottom: calc(env(safe-area-inset-bottom, 0px) + 5.5rem);
  }
}

@media (min-width: 1024px) {
  body.labs-on .fabsearch {
    display: none;
  }
  body.labs-on .updbar {
    left: auto;
    right: 1.5rem;
    bottom: 1.5rem;
    max-width: 26.25rem;
  }
  body.labs-on .toast {
    bottom: 1.75rem;
  }
}

@media (max-width: 1439px) {
  body.labs-section.drawer-open .fabs {
    opacity: 0;
    pointer-events: none;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .p3bar > i,
  .beat.flashbeat,
  body.labs-on .qcard .opt,
  body.labs-section .labs-drawer,
  body.labs-section .sechead,
  body.labs-section .section-body,
  .labs-srow,
  .labs-spnav-btn,
  .labs-spbar > i,
  .labs-quietrow,
  .labs-map-row,
  .door,
  .frow,
  .qwrap.is-enter-next,
  .qwrap.is-enter-prev,
  .qdetails-k::after,
  body.labs-section .drawerbtn,
  .examdoor,
  .mk-sec-row,
  .mockbar-track > i,
  .setitem,
  #setBody.labs-setp .set-detail.slide-fwd,
  #setBody.labs-setp .set-rail.slide-back,
  .labs-setp .syncdot.busy,
  body.labs-on #ovSearch .searchp,
  body.labs-on .updbar,
  body.labs-on .fabs {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}