/* ============================================================
   CapSub — Refined academic aesthetic
   Inspired by typography of academic presses + technical journals
   ============================================================ */

:root {
  /* Paper-and-ink palette with a single accent for emphasis */
  --paper:        #f7f3ec;
  --paper-warm:   #f1ece2;
  --ink:          #1a1814;
  --ink-soft:     #3d3935;
  --ink-faint:    #8a847a;
  --rule:         #d9d2c4;
  --rule-faint:   #e8e2d4;

  /* Accent: deep reading-glasses red used sparingly */
  --accent:       #b8412e;
  --accent-soft:  #d6826f;

  /* Speaker tones */
  --prof-tone:    #1a1814;   /* full ink */
  --stud-tone:    #6b5d52;   /* warm gray-brown */
  --stud-bg:      #ede6d6;

  /* Confidence badges */
  --conf-high:    #2d5a3d;
  --conf-med:     #8a6f1f;
  --conf-low:     #8a847a;

  /* Type */
  --serif:  'Fraunces', 'Iowan Old Style', Georgia, serif;
  --sans:   'Inter Tight', system-ui, sans-serif;
  --mono:   'JetBrains Mono', ui-monospace, monospace;

  /* Geometry */
  --rule-w:    1px;
  --max-w:     1280px;
  --gutter:    clamp(1.25rem, 3vw, 2.5rem);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.5;
  text-rendering: geometricPrecision;
  background-image:
    radial-gradient(circle at 20% 0%, rgba(184, 65, 46, 0.025) 0%, transparent 40%),
    radial-gradient(circle at 80% 100%, rgba(60, 40, 20, 0.03) 0%, transparent 50%);
  background-attachment: fixed;
  position: relative;
}

/* Subtle paper grain */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.4;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' /%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.06 0' /%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)' /%3E%3C/svg%3E");
}

/* ============================================================
   Masthead
   ============================================================ */
.masthead {
  border-bottom: var(--rule-w) solid var(--ink);
  background: var(--paper);
  position: relative;
  z-index: 2;
}
.masthead-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1.1rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
}
.brand-mark {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.4rem;
  color: var(--accent);
  font-weight: 500;
  line-height: 1;
}
.brand-name {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}
.meta-nav {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  font-family: var(--sans);
  font-size: 0.78rem;
}
.meta-item {
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
}
.meta-label {
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  font-weight: 500;
  font-size: 0.7rem;
}
.meta-value {
  color: var(--ink);
  font-weight: 500;
}
.meta-divider {
  width: 1px;
  height: 0.9rem;
  background: var(--rule);
}
@media (max-width: 720px) {
  .meta-nav { display: none; }
}

/* ============================================================
   Page container
   ============================================================ */
.page {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
  position: relative;
  z-index: 2;
}

/* ============================================================
   Title block
   ============================================================ */
.title-block {
  padding: clamp(3rem, 7vw, 5.5rem) 0 clamp(2rem, 4vw, 3rem);
  border-bottom: var(--rule-w) solid var(--rule);
  position: relative;
}
.kicker {
  font-family: var(--sans);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 1.4rem;
  display: flex;
  align-items: center;
  gap: 0.7rem;
}
.kicker::before {
  content: '';
  width: 1.5rem;
  height: 1px;
  background: var(--accent);
}
.title {
  font-family: var(--serif);
  font-size: clamp(2.3rem, 5.5vw, 4.2rem);
  font-weight: 400;
  line-height: 1.04;
  letter-spacing: -0.025em;
  margin-bottom: 1.5rem;
  max-width: 22ch;
}
.title em {
  font-style: italic;
  font-weight: 400;
  color: var(--accent);
}
.dek {
  font-family: var(--serif);
  font-size: clamp(1.05rem, 1.5vw, 1.2rem);
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 56ch;
  margin-bottom: 2.5rem;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: var(--rule-w) solid var(--rule);
  border-bottom: var(--rule-w) solid var(--rule);
  background: var(--paper-warm);
}
.stat {
  padding: 1.4rem 1.2rem;
  border-right: var(--rule-w) solid var(--rule);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  text-align: center;
}
.stat:last-child { border-right: none; }
.stat-num {
  font-family: var(--serif);
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: lining-nums tabular-nums;
}
.stat-lbl {
  font-family: var(--sans);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  font-weight: 500;
}
@media (max-width: 600px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: none; }
  .stat:nth-child(1), .stat:nth-child(2) { border-bottom: var(--rule-w) solid var(--rule); }
}

/* ============================================================
   Video player
   ============================================================ */
.player-block {
  padding: clamp(2.5rem, 5vw, 3.5rem) 0 clamp(1.5rem, 3vw, 2rem);
  border-bottom: var(--rule-w) solid var(--rule);
}
.player-frame {
  position: relative;
  background: #0a0908;
  aspect-ratio: 16 / 9;
  width: 100%;
  max-width: 980px;
  margin: 0 auto;
  border: var(--rule-w) solid var(--ink);
}
.player-frame video {
  width: 100%;
  height: 100%;
  display: block;
  background: #0a0908;
}
.frame-corners .corner {
  position: absolute;
  width: 14px;
  height: 14px;
  border: var(--rule-w) solid var(--ink);
  background: var(--paper);
  pointer-events: none;
}
.corner.tl { top: -8px; left: -8px; border-bottom: 0; border-right: 0; }
.corner.tr { top: -8px; right: -8px; border-bottom: 0; border-left: 0; }
.corner.bl { bottom: -8px; left: -8px; border-top: 0; border-right: 0; }
.corner.br { bottom: -8px; right: -8px; border-top: 0; border-left: 0; }

/* Caption overlay - YouTube/Netflix style single-line captions */
.caption-overlay {
  position: absolute;
  left: 50%;
  bottom: 60px;  /* sits above native video controls */
  transform: translateX(-50%) translateY(8px);
  max-width: 88%;
  padding: 0.55rem 1rem;
  background: rgba(10, 9, 8, 0.78);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  color: #f7f3ec;
  font-family: var(--serif);
  font-size: clamp(0.95rem, 1.4vw, 1.15rem);
  line-height: 1.35;
  text-align: center;
  border-radius: 2px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease, transform 0.2s ease;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.6);
  letter-spacing: 0.005em;
}
.caption-overlay.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.caption-overlay.caption-student {
  font-style: italic;
  color: #ede6d6;
  border-left: 3px solid var(--accent-soft);
  padding-left: 0.9rem;
  text-align: left;
}

/* On smaller screens, push caption up so it doesn't collide with controls */
@media (max-width: 640px) {
  .caption-overlay {
    bottom: 50px;
    font-size: 0.9rem;
    padding: 0.45rem 0.8rem;
  }
}

.player-meta {
  max-width: 980px;
  margin: 1rem auto 0;
}
.pipeline-stages {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.4rem 1.4rem;
  font-family: var(--sans);
}
.stage {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.78rem;
  color: var(--ink-faint);
  position: relative;
}
.stage:not(:last-child)::after {
  content: '·';
  position: absolute;
  right: -0.85rem;
  top: 50%;
  transform: translateY(-55%);
  color: var(--rule);
  font-size: 1.1rem;
  pointer-events: none;
}
.stage-check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background: transparent;
  color: var(--ink-faint);
  font-size: 0.7rem;
  font-weight: 600;
  border: 1px solid var(--rule);
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.stage-done .stage-check {
  background: var(--accent);
  color: var(--paper);
  border-color: var(--accent);
}
.stage-done .stage-name {
  color: var(--ink);
  font-weight: 500;
}
.stage-name {
  letter-spacing: 0.005em;
}

@media (max-width: 640px) {
  .pipeline-stages {
    gap: 0.5rem 1rem;
    font-size: 0.72rem;
  }
  .stage:not(:last-child)::after { display: none; }
}

/* ============================================================
   Two-column transcript + Q&A grid
   ============================================================ */
.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
  gap: 0;
  padding: clamp(2.5rem, 5vw, 4rem) 0;
  position: relative;
}
.content-grid::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc((100% - 360px) / 1 * 0.715);  /* visual rule between columns */
}

@media (max-width: 920px) {
  .content-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

.column-head {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: var(--rule-w) solid var(--ink);
}
.column-title {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 0.4rem;
}
.column-sub {
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--ink-faint);
}

/* ============================================================
   Transcript column
   ============================================================ */
.transcript-column {
  padding-right: clamp(1.5rem, 3vw, 2.5rem);
  border-right: var(--rule-w) solid var(--rule);
}
@media (max-width: 920px) {
  .transcript-column {
    padding-right: 0;
    border-right: none;
    border-bottom: var(--rule-w) solid var(--rule);
    padding-bottom: 2.5rem;
  }
}

.legend {
  display: flex;
  gap: 1.2rem;
  margin-top: 0.8rem;
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--ink-faint);
  flex-wrap: wrap;
}
.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  display: inline-block;
}
.dot-prof { background: var(--prof-tone); }
.dot-stud { background: var(--stud-tone); }
.dot-corr { background: var(--accent); }

.transcript-scroll {
  max-height: 70vh;
  overflow-y: auto;
  padding-right: 1rem;
  scrollbar-width: thin;
  scrollbar-color: var(--rule) transparent;
}
.transcript-scroll::-webkit-scrollbar { width: 8px; }
.transcript-scroll::-webkit-scrollbar-track { background: transparent; }
.transcript-scroll::-webkit-scrollbar-thumb {
  background: var(--rule);
  border-radius: 4px;
}

/* Search bar */
.search-bar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0.75rem;
  margin-bottom: 1rem;
  border: var(--rule-w) solid var(--rule);
  background: var(--paper);
  transition: border-color 0.15s ease, background-color 0.15s ease;
  position: relative;
}
.search-bar:focus-within {
  border-color: var(--ink);
  background: var(--paper-warm);
}
.search-icon {
  font-size: 1rem;
  color: var(--ink-faint);
  font-family: var(--serif);
  line-height: 1;
  user-select: none;
}
.search-input {
  flex: 1;
  border: none;
  background: transparent;
  font-family: var(--serif);
  font-size: 0.95rem;
  color: var(--ink);
  outline: none;
  padding: 0.25rem 0;
}
.search-input::placeholder {
  color: var(--ink-faint);
  font-style: italic;
}
/* Hide native clear button in search inputs (redundant with our custom one) */
.search-input::-webkit-search-cancel-button,
.search-input::-webkit-search-decoration,
.search-input::-webkit-search-results-button,
.search-input::-webkit-search-results-decoration {
  -webkit-appearance: none;
  appearance: none;
  display: none;
}
.search-input::-ms-clear,
.search-input::-ms-reveal {
  display: none;
  width: 0;
  height: 0;
}
.search-count {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
  user-select: none;
  white-space: nowrap;
}
.search-clear {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--ink-faint);
  font-size: 1.3rem;
  line-height: 1;
  padding: 0 0.2rem;
  font-family: var(--sans);
  transition: color 0.15s ease;
}
.search-clear:hover {
  color: var(--accent);
}

/* Hide segments not matching the active search */
.segment.search-hidden {
  display: none;
}

/* When search is active and no segments match */
.search-empty {
  padding: 2rem 1rem;
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink-faint);
  font-size: 0.95rem;
  text-align: center;
}

.segment {
  padding: 0.9rem 0;
  display: grid;
  grid-template-columns: 4rem 1fr;
  gap: 1.2rem;
  border-bottom: var(--rule-w) dashed var(--rule-faint);
  transition: background-color 0.15s ease;
}
.segment:last-child { border-bottom: none; }

.segment-time {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
  padding-top: 0.2rem;
  cursor: pointer;
  transition: color 0.15s ease;
  user-select: none;
}
.segment-time:hover {
  color: var(--accent);
}

.segment-body {
  font-family: var(--serif);
  font-size: 1.04rem;
  line-height: 1.6;
}

.segment-speaker {
  font-family: var(--sans);
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 600;
  color: var(--ink-faint);
  margin-right: 0.5rem;
  display: inline-block;
  vertical-align: 1px;
}

.segment-student .segment-body { color: var(--stud-tone); }
.segment-student .segment-speaker { color: var(--accent); }

/* Word-level highlighting */
.word {
  display: inline;
  padding: 0 0.05em;
  margin: 0 -0.05em;
  border-radius: 2px;
  cursor: pointer;
  transition: background-color 0.12s ease, color 0.12s ease;
}
.word:hover {
  background: var(--rule-faint);
}
.word.spoken {
  color: var(--ink);
}
.word.unspoken {
  color: var(--ink-faint);
}
.word.corrected {
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.word-gap {
  display: inline;
}
.word.search-match,
.word-gap.search-match {
  background: rgba(184, 65, 46, 0.18);
  color: var(--ink);
}
.word.search-match-start {
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
}
.word.search-match-middle,
.word-gap.search-match-middle {
  border-radius: 0;
}
.word.search-match-end {
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
}
.word.search-match:hover {
  background: rgba(184, 65, 46, 0.28);
}

/* Active segment visual emphasis */
.segment.is-current {
  background: linear-gradient(90deg, transparent 0%, var(--paper-warm) 8%, var(--paper-warm) 100%);
  margin: 0 -1rem;
  padding-left: 1rem;
  padding-right: 1rem;
  border-radius: 2px;
}
.segment.is-current .segment-time {
  color: var(--accent);
  font-weight: 500;
}

/* ============================================================
   Q&A column
   ============================================================ */
.qa-column {
  padding-left: clamp(1.5rem, 3vw, 2.5rem);
}
@media (max-width: 920px) {
  .qa-column { padding-left: 0; }
}

.qa-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 2.5rem;
}
.qa-item {
  border: var(--rule-w) solid var(--rule);
  background: var(--paper);
  padding: 0.9rem 1rem;
  cursor: pointer;
  transition: border-color 0.15s ease, transform 0.15s ease;
  position: relative;
}
.qa-item:hover {
  border-color: var(--ink);
  transform: translateX(-2px);
}
.qa-item.is-current {
  border-color: var(--accent);
  background: var(--paper-warm);
}
.qa-item.is-current::before {
  content: '';
  position: absolute;
  left: -1px;
  top: -1px;
  bottom: -1px;
  width: 3px;
  background: var(--accent);
}

/* Hidden Q&A items (when filter is active) */
.qa-item.qa-hidden {
  display: none;
}

/* "Show all" toggle button */
.qa-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: none;
  border: none;
  padding: 0;
  margin: -1.5rem 0 2.5rem;
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--ink-faint);
  cursor: pointer;
  text-decoration: none;
  border-bottom: 1px dotted var(--rule);
  padding-bottom: 2px;
  align-self: flex-start;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.qa-toggle:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.qa-toggle::before {
  content: '+';
  font-size: 0.95rem;
  font-weight: 500;
  line-height: 1;
}
.qa-toggle[hidden] {
  display: none;
}

.qa-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.35rem;
}
.qa-time {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  font-weight: 500;
}
.qa-conf {
  font-family: var(--sans);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 2px;
}
.qa-conf.conf-high {
  background: var(--conf-high);
  color: var(--paper);
}
.qa-conf.conf-medium {
  background: var(--conf-med);
  color: var(--paper);
}
.qa-conf.conf-low {
  background: transparent;
  color: var(--conf-low);
  border: 1px solid var(--rule);
}

.qa-detail {
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--ink-soft);
  line-height: 1.45;
}
.qa-cue {
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink);
}
.qa-signals {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--ink-faint);
  margin-top: 0.3rem;
}

.confidence-key {
  border-top: var(--rule-w) solid var(--rule);
  padding-top: 1.5rem;
}
.key-title {
  font-family: var(--sans);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  font-weight: 600;
  margin-bottom: 0.8rem;
}
.confidence-key dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.5rem 0.9rem;
  font-family: var(--serif);
  font-size: 0.88rem;
  line-height: 1.4;
}
.confidence-key dt {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--sans);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  padding: 1px 6px 2px;
  border-radius: 2px;
  text-align: center;
  align-self: start;
  margin-top: 2px;
  white-space: nowrap;
  height: fit-content;
}
.conf.conf-high { background: var(--conf-high); color: var(--paper); }
.conf.conf-medium { background: var(--conf-med); color: var(--paper); }
.conf.conf-low { background: transparent; color: var(--conf-low); border: 1px solid var(--rule); }
.confidence-key dd {
  color: var(--ink-soft);
  font-size: 0.85rem;
}

/* ============================================================
   Colophon
   ============================================================ */
.colophon {
  padding: 3rem 0 4rem;
  border-top: var(--rule-w) solid var(--ink);
}
.colophon-line {
  width: 3rem;
  height: 1px;
  background: var(--accent);
  margin: 0 auto 1.5rem;
}
.colophon-text {
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.95rem;
  color: var(--ink-faint);
  text-align: center;
  max-width: 60ch;
  margin: 0 auto;
  line-height: 1.55;
}

/* ============================================================
   Subtle reveal animation on load
   ============================================================ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.title-block, .player-block, .content-grid, .colophon {
  animation: fadeUp 0.6s cubic-bezier(.2,.6,.2,1) backwards;
}
.title-block { animation-delay: 0.05s; }
.player-block { animation-delay: 0.15s; }
.content-grid { animation-delay: 0.25s; }
.colophon { animation-delay: 0.4s; }