:root {
  --paper: #f4f4f1;
  --paper-card: #fafaf7;
  --grid-small: #dadad5;
  --grid-major: #c7c7c1;
  --ink: #292825;
  --ink-soft: #504e49;
  --ink-faint: #77736b;
  --red: #b9211d;
  --red-soft: #e65850;
  --blue: #168bd7;
  --blue-dark: #087fc8;
  --green: #22b58b;
  --green-dark: #159e7a;
  --yellow: #f4d95b;
  --yellow-light: #ffe67d;
  --mint: #85d9bb;
  --sky: #7ec9f0;
  --coral: #f2aaa1;
  --violet: #b4a6e8;
  --white: #ffffff;
  --black: #050505;
  --font-cn: "Comic Sans MS", "STKaiti", "KaiTi", "Microsoft YaHei", sans-serif;
  --font-brush: "Comic Sans MS", "STXingkai", "FZShuTi", "STKaiti", "KaiTi", cursive;
  --font-en: "Comic Sans MS", "Segoe Print", "STKaiti", cursive;
  --ease-paper: cubic-bezier(.2, .74, .16, 1);
  --stage-scale: 1;
}

* { box-sizing: border-box; }

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
}

body {
  color: var(--ink);
  font-family: var(--font-cn);
  background: var(--paper);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

button,
kbd { font: inherit; }

.paper-grid {
  background-color: var(--paper);
  background-image:
    linear-gradient(to right, color-mix(in srgb, var(--grid-major) 78%, transparent) 1.25px, transparent 1.25px),
    linear-gradient(to bottom, color-mix(in srgb, var(--grid-major) 78%, transparent) 1.25px, transparent 1.25px),
    linear-gradient(to right, color-mix(in srgb, var(--grid-small) 72%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in srgb, var(--grid-small) 72%, transparent) 1px, transparent 1px),
    radial-gradient(circle at 28% 20%, rgba(255,255,255,.48), transparent 40%);
  background-size: 96px 96px, 96px 96px, 24px 24px, 24px 24px, 100% 100%;
}

.segment-page {
  position: relative;
  background: var(--paper);
  user-select: none;
  cursor: default;
}

.stage {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 1600px;
  height: 900px;
  overflow: hidden;
  transform: translate(-50%, -50%) scale(var(--stage-scale));
  transform-origin: center;
  isolation: isolate;
}

.stage::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 100;
  opacity: .1;
  background-image: radial-gradient(circle, rgba(41,40,37,.22) .45px, transparent .6px);
  background-size: 7px 7px;
  mix-blend-mode: multiply;
}

.scene-kicker {
  position: absolute;
  top: 34px;
  left: 46px;
  z-index: 80;
  margin: 0;
  color: var(--blue-dark);
  font: 700 17px/1 var(--font-en);
  letter-spacing: .03em;
}

.scene-index {
  position: absolute;
  top: 34px;
  right: 46px;
  z-index: 80;
  color: var(--ink-faint);
  font: 700 14px/1 var(--font-en);
  letter-spacing: .12em;
}

.brush-title {
  margin: 0;
  font-family: var(--font-brush);
  font-weight: 800;
  line-height: .98;
  letter-spacing: -.035em;
}

.en-hand { font-family: var(--font-en); }
.ink-soft { color: var(--ink-soft); }
.blue-ink { color: var(--blue-dark); }
.green-ink { color: var(--green-dark); }
.red-ink { color: var(--red); }

.marker-stroke {
  position: absolute;
  z-index: -1;
  height: .7em;
  border-radius: 999px 86% 94% 999px;
  opacity: .42;
  transform: rotate(-.7deg);
  background: var(--yellow);
}

.marker-stroke::after {
  content: "";
  position: absolute;
  inset: 23% -2% 12% 2%;
  border-radius: inherit;
  opacity: .62;
  background: var(--yellow-light);
  transform: rotate(.9deg);
}

.rough-frame,
.rough-ui-card {
  position: relative;
  background: color-mix(in srgb, var(--paper-card) 90%, transparent);
  border: 4px solid var(--red);
  box-shadow: 2px 4px 14px rgba(76, 74, 69, .09);
  clip-path: polygon(.45% .8%, 99.55% .1%, 99.9% 99.2%, .08% 99.85%);
}

.rough-frame::after,
.rough-ui-card::after {
  content: "";
  position: absolute;
  inset: 10px 9px 9px 11px;
  pointer-events: none;
  border: 1.5px solid var(--red-soft);
  clip-path: polygon(.2% .5%, 99.7% .2%, 99.9% 99.5%, .1% 99.8%);
}

.pastel-card {
  position: relative;
  padding: 20px 24px;
  background: color-mix(in srgb, var(--paper-card) 92%, transparent);
  border: 2px solid color-mix(in srgb, var(--ink) 26%, transparent);
  box-shadow: 2px 4px 10px rgba(76, 74, 69, .06);
}

.pastel-card.mint { background: color-mix(in srgb, var(--mint) 24%, var(--paper-card)); }
.pastel-card.sky { background: color-mix(in srgb, var(--sky) 22%, var(--paper-card)); }
.pastel-card.coral { background: color-mix(in srgb, var(--coral) 22%, var(--paper-card)); }
.pastel-card.violet { background: color-mix(in srgb, var(--violet) 22%, var(--paper-card)); }
.pastel-card.yellow { background: color-mix(in srgb, var(--yellow) 24%, var(--paper-card)); }

.hand-note {
  color: var(--ink-soft);
  font: 700 18px/1.3 var(--font-brush);
}

.pill-label {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 5px 16px 6px;
  border-radius: 999px 82% 999px 87%;
  color: var(--ink);
  font: 700 17px/1 var(--font-brush);
  background: color-mix(in srgb, var(--yellow) 36%, var(--paper-card));
  transform: rotate(-.4deg);
}

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

/* Step-driven animation primitives */
[data-from] {
  opacity: 0;
  visibility: hidden;
  transition:
    opacity .18s var(--ease-paper),
    transform .28s var(--ease-paper),
    filter .22s ease,
    clip-path .32s var(--ease-paper);
}

[data-from].is-visible {
  opacity: 1;
  visibility: visible;
}

.reveal-up { transform: translateY(22px) rotate(var(--tilt, -.25deg)); }
.reveal-up.is-visible { transform: translateY(0) rotate(var(--tilt, -.25deg)); }
.reveal-left { transform: translateX(-30px) rotate(var(--tilt, -.3deg)); }
.reveal-left.is-visible { transform: translateX(0) rotate(var(--tilt, -.3deg)); }
.reveal-right { transform: translateX(30px) rotate(var(--tilt, .3deg)); }
.reveal-right.is-visible { transform: translateX(0) rotate(var(--tilt, .3deg)); }
.reveal-scale { transform: scale(.82) rotate(var(--tilt, 0deg)); filter: blur(2px); }
.reveal-scale.is-visible { transform: scale(1) rotate(var(--tilt, 0deg)); filter: blur(0); }
.reveal-pop { transform: scale(.45) rotate(var(--tilt, -2deg)); filter: blur(1.5px); }
.reveal-pop.is-visible { transform: scale(1) rotate(var(--tilt, 0deg)); filter: blur(0); }
.wipe-right { clip-path: inset(0 100% 0 0); }
.wipe-right.is-visible { clip-path: inset(0 -4% 0 0); }
.wipe-left { clip-path: inset(0 0 0 100%); }
.wipe-left.is-visible { clip-path: inset(0 0 0 -4%); }

svg [data-draw] {
  stroke-dasharray: var(--path-length, 1200);
  stroke-dashoffset: var(--path-length, 1200);
  transition: stroke-dashoffset .36s var(--ease-paper), opacity .12s ease;
}

svg [data-draw].is-visible { stroke-dashoffset: 0; }

/* Quick-pacing pages keep the same ordered choreography with shorter transitions. */
.fast-pacing [data-from] {
  transition-duration: .12s, .18s, .14s, .2s;
}

.fast-pacing svg [data-draw] { transition-duration: .2s, .08s; }

.guided-pacing [data-from] {
  transition-duration: .22s, .34s, .28s, .4s;
}

.guided-pacing svg [data-draw] { transition-duration: .46s, .12s; }

.sequencer-loading [data-from],
.sequencer-loading svg [data-draw],
.no-motion [data-from],
.no-motion svg [data-draw] { transition-duration: .001ms !important; transition-delay: 0s !important; }

/* Video-derived Codex screens: the authentic application frame stays intact;
   crop, watermark removal and teaching focus are applied as presentation layers. */
.codex-video-source-layer {
  position: absolute;
  z-index: 80;
  inset: 0;
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  color: #283038;
  background: #eef1f2;
  pointer-events: none;
  transition: opacity .12s ease, visibility 0s linear .12s;
}

.codex-video-source-layer.is-ready.is-active {
  opacity: 1;
  visibility: visible;
  transition-delay: 0s;
}

.codex-video-source-media,
.codex-video-source-frame {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.codex-video-source-media { z-index: 1; overflow: hidden; background: #f5f6f6; }

.codex-video-source-frame {
  opacity: 0;
  object-fit: cover;
  object-position: 50% 0;
  transform: scale(1.006);
  transform-origin: 50% 42%;
  filter: saturate(.93) contrast(1.025) brightness(1.01);
  transition: opacity .11s linear, transform .18s cubic-bezier(.2,.72,.2,1);
}

.codex-video-source-frame.is-active {
  opacity: 1;
  transform: scale(1.012);
}

.codex-video-watermark-mask {
  position: absolute;
  z-index: 5;
  top: 0;
  right: 0;
  width: 390px;
  height: 74px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  padding: 0 18px;
  color: #434b52;
  background: linear-gradient(135deg, rgba(248,249,249,.99), #eff2f3);
  border-left: 1px solid rgba(118,126,134,.16);
  border-bottom: 1px solid rgba(118,126,134,.16);
  border-bottom-left-radius: 15px;
  font: 800 10px/1 "Segoe UI", Arial, sans-serif;
  letter-spacing: .08em;
}

.codex-video-watermark-mask small {
  color: #8b9298;
  font-size: 7px;
  font-weight: 650;
  letter-spacing: .1em;
}

.codex-video-subtitle-mask {
  position: absolute;
  z-index: 4;
  left: 0;
  right: 0;
  bottom: 0;
  height: 30px;
  background: linear-gradient(180deg, rgba(246,247,247,0), rgba(246,247,247,.96) 72%, #f6f7f7);
}

.codex-video-focus {
  position: absolute;
  z-index: 6;
  left: var(--focus-left, 22%);
  top: var(--focus-top, 9%);
  width: var(--focus-width, 53%);
  height: var(--focus-height, 76%);
  border: 3px solid rgba(22,139,215,.92);
  border-radius: 10px;
  box-shadow: 0 0 0 9999px rgba(25,34,42,.075), 0 0 0 3px rgba(255,255,255,.52), 0 8px 26px rgba(22,74,112,.2);
  transition: left .18s var(--ease-paper), top .18s var(--ease-paper), width .18s var(--ease-paper), height .18s var(--ease-paper);
}

.codex-video-source-badge {
  position: absolute;
  z-index: 7;
  left: 14px;
  bottom: 12px;
  min-width: 104px;
  padding: 7px 10px;
  color: #fff;
  background: rgba(25,31,36,.88);
  border: 1px solid rgba(255,255,255,.42);
  border-radius: 7px;
  box-shadow: 0 4px 14px rgba(20,25,30,.16);
  font: 750 9px/1 "Segoe UI", Arial, sans-serif;
  letter-spacing: .07em;
}

.sequencer-loading .codex-video-source-layer,
.sequencer-loading .codex-video-source-frame,
.sequencer-loading .codex-video-focus,
.no-motion .codex-video-source-layer,
.no-motion .codex-video-source-frame,
.no-motion .codex-video-focus { transition-duration: .001ms !important; transition-delay: 0s !important; }

/* Controller */
.controller-page { background: #232320; }

.controller-shell {
  position: relative;
  width: 100%;
  height: 100%;
  display: grid;
  grid-template-rows: 52px minmax(0, 1fr) 38px;
  overflow: hidden;
  background: #232320;
}

.controller-stage {
  position: relative;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background: var(--paper);
  box-shadow: inset 0 1px rgba(255,255,255,.55), inset 0 -1px rgba(41,40,37,.18);
}

.segment-frame-stack {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background: var(--paper);
}

.segment-frame {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  background: var(--paper);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.segment-frame.is-active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.controller-chrome {
  transition: opacity .28s ease, transform .28s ease;
}

.controller-page.hud-idle .controller-chrome { opacity: .68; }
.controller-page.hud-idle .controller-header,
.controller-page.hud-idle .controller-footer { transform: none; }

.controller-header {
  position: relative;
  z-index: 40;
  display: grid;
  grid-template-columns: minmax(260px, .9fr) auto minmax(140px, .36fr);
  align-items: center;
  gap: 14px;
  min-width: 0;
  padding: 7px 16px 6px;
  pointer-events: none;
  color: var(--ink-soft);
  text-shadow: 0 1px 0 rgba(255,255,255,.72);
  border-bottom: 1px solid rgba(41,40,37,.2);
  background-color: var(--paper);
  background-image:
    linear-gradient(to right, rgba(199,199,193,.52) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(199,199,193,.52) 1px, transparent 1px);
  background-size: 24px 24px;
}

.controller-header > div:first-child { display: block; min-width: 0; }

.controller-kicker {
  margin: 0 0 2px;
  color: var(--blue-dark);
  font: 700 11px/1.1 var(--font-en);
  letter-spacing: .06em;
}

.controller-header h1 {
  margin: 0;
  font: 800 14px/1.1 var(--font-brush);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.controller-subindex {
  margin: 2px 0 0;
  color: var(--ink-faint);
  font: 700 10px/1.1 var(--font-en);
  letter-spacing: .04em;
}

.chapter-index {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3px;
  pointer-events: auto;
}

.chapter-index button {
  min-width: 39px;
  padding: 4px 6px 5px;
  border: 1px solid color-mix(in srgb, var(--ink) 14%, transparent);
  border-radius: 999px 82% 999px 88%;
  color: var(--ink-faint);
  background: rgba(250,250,247,.62);
  cursor: pointer;
  font: 800 10px/1 var(--font-en);
  transition: color .2s ease, background .2s ease, border-color .2s ease;
}

.chapter-index button.is-active {
  color: var(--white);
  border-color: var(--red);
  background: var(--red);
}

.chapter-index button:disabled {
  opacity: .32;
  cursor: default;
}

.controller-source {
  justify-self: end;
  padding: 5px 9px;
  border-radius: 999px;
  background: rgba(244, 217, 91, .28);
  font: 700 10px/1 var(--font-en);
  letter-spacing: .1em;
}

.controller-footer {
  position: relative;
  z-index: 45;
  display: grid;
  grid-template-columns: auto minmax(110px, 1fr) auto auto;
  align-items: center;
  gap: 12px;
  padding: 4px 12px 5px 16px;
  border-top: 1px solid rgba(41,40,37,.18);
  color: var(--ink-soft);
  background: var(--paper-card);
}

.progress-copy {
  white-space: nowrap;
  font: 700 11px/1 var(--font-en);
  letter-spacing: .04em;
}

.timeline-playing #step-count::after {
  content: ' · 自动演出中';
  color: var(--green-deep);
}

.progress-divider { color: var(--red); }

.progress-track {
  height: 5px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(41,40,37,.11);
}

.progress-track span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--blue), var(--green));
  transition: width .34s var(--ease-paper);
}

.segment-dots { display: flex; align-items: center; gap: 7px; }

.segment-dots button {
  width: 8px;
  height: 8px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  cursor: pointer;
  background: rgba(41,40,37,.22);
  transition: width .24s ease, border-radius .24s ease, background .24s ease;
}

.segment-dots button.is-active {
  width: 24px;
  border-radius: 999px;
  background: var(--red);
}

.controller-actions { display: flex; gap: 6px; }

.controller-actions button,
.help-close {
  display: grid;
  place-items: center;
  min-width: 28px;
  height: 26px;
  padding: 0 8px;
  border: 1px solid rgba(41,40,37,.22);
  border-radius: 8px;
  color: var(--ink);
  background: rgba(255,255,255,.72);
  cursor: pointer;
  font: 800 13px/1 var(--font-en);
}

.controller-actions button:hover,
.help-close:hover { border-color: var(--red); color: var(--red); }

.first-run-hint {
  position: absolute;
  z-index: 42;
  left: 50%;
  bottom: 18px;
  display: flex;
  align-items: center;
  gap: 9px;
  transform: translateX(-50%) rotate(-.3deg);
  padding: 8px 16px;
  border-radius: 999px;
  color: var(--ink);
  background: color-mix(in srgb, var(--yellow) 34%, rgba(250,250,247,.9));
  box-shadow: 0 4px 16px rgba(41,40,37,.08);
  font: 700 13px/1.2 var(--font-brush);
  transition: opacity .3s ease, transform .3s ease;
}

.first-run-hint.is-hidden { opacity: 0; transform: translateX(-50%) translateY(10px); pointer-events: none; }
.hint-pencil { color: var(--blue); font-size: 18px; }
kbd { display: inline-block; padding: 2px 7px; border: 1px solid currentColor; border-radius: 5px; font: 700 11px/1.2 var(--font-en); }

.transition-mask {
  position: absolute;
  z-index: 35;
  inset: 0;
  display: grid;
  place-items: center;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  background: var(--paper);
  transition: opacity .22s ease, visibility .22s ease;
}

.transition-mask.is-snapping { transition: none !important; }

.transition-mask.is-active { opacity: 1; visibility: visible; }

.transition-stroke {
  position: absolute;
  width: min(420px, 52vw);
  height: 34px;
  border-radius: 999px;
  background: rgba(244,217,91,.4);
  opacity: 0;
  visibility: hidden;
  transform: rotate(-1.5deg) scaleX(.2);
  transform-origin: left;
}

.transition-label {
  z-index: 1;
  opacity: 0;
  visibility: hidden;
  font: 800 16px/1 var(--font-brush);
  color: var(--ink-soft);
}

.transition-mask.is-delayed-hint .transition-stroke {
  opacity: 1;
  visibility: visible;
  animation: transition-swipe .5s var(--ease-paper) both;
}

.transition-mask.is-delayed-hint .transition-label {
  opacity: 1;
  visibility: visible;
  animation: delayed-hint-in .2s ease both;
}

@keyframes transition-swipe { to { transform: rotate(-1.5deg) scaleX(1); } }
@keyframes delayed-hint-in { from { opacity: 0; transform: translateY(4px); } }

.help-panel,
.blackout {
  position: absolute;
  z-index: 90;
  inset: 0;
  display: grid;
  place-items: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity .25s ease, visibility .25s ease;
}

.help-panel { background: rgba(41,40,37,.32); backdrop-filter: blur(7px); }
.help-panel.is-open,
.blackout.is-open { opacity: 1; visibility: visible; }

.help-card {
  width: min(780px, calc(100vw - 48px));
  padding: 48px 52px 42px;
  transform: rotate(-.2deg);
}

.help-close { position: absolute; z-index: 2; top: 18px; right: 18px; }
.ui-highlighter { position: absolute; z-index: -1; top: 45px; left: 44px; width: 310px; height: 34px; border-radius: 999px; background: rgba(244,217,91,.4); transform: rotate(-1.1deg); }
.help-eyebrow { margin: 0 0 7px; color: var(--blue-dark); font: 800 15px/1 var(--font-en); }
.help-card h2 { margin: 0 0 28px; font: 800 34px/1.1 var(--font-brush); }
.help-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 13px 18px; }
.help-grid > div { display: flex; align-items: center; flex-wrap: wrap; gap: 6px; min-height: 42px; padding: 9px 11px; background: rgba(126,201,240,.12); }
.help-grid span { margin-left: 5px; font-size: 14px; }
.help-note { margin: 23px 0 0; color: var(--ink-soft); font-size: 14px; }

.blackout { color: rgba(255,255,255,.56); background: var(--black); }
.blackout p { font: 700 16px/1 var(--font-cn); letter-spacing: .08em; }

@media (max-width: 760px) {
  .controller-shell { grid-template-rows: 0 minmax(0, 1fr) 34px; }
  .controller-header { display: none; }
  .controller-footer { grid-template-columns: auto 1fr auto; }
  .segment-dots { display: none; }
  .help-grid { grid-template-columns: 1fr; }
}

:fullscreen .controller-shell,
:-webkit-full-screen .controller-shell {
  grid-template-rows: 0 minmax(0, 1fr) 0;
}

:fullscreen .controller-header,
:fullscreen .controller-footer,
:-webkit-full-screen .controller-header,
:-webkit-full-screen .controller-footer {
  opacity: 0 !important;
  visibility: hidden;
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}