/* 墨 · INK —— 宣纸白 / 焦墨黑 / 印泥红 */
:root {
  --paper: #f7f4ec;
  --ink: #1c1a17;
  --ink-soft: #6b665e;
  --seal: #b3352b;
  --serif: "Songti SC", "STSong", "SimSun", "Noto Serif SC", Georgia, serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: auto; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  -webkit-font-smoothing: antialiased;
}

/* ---------- 加载层 ---------- */
#loader {
  position: fixed; inset: 0; z-index: 50;
  background: var(--paper);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 18px; transition: opacity .9s ease;
}
#loader.gone { opacity: 0; pointer-events: none; }
.loader-char { font-size: 72px; letter-spacing: 0; }
.loader-count { font-size: 13px; letter-spacing: .35em; color: var(--ink-soft); }
.loader-count::after { content: " %"; }

/* ---------- 常驻 chrome ---------- */
.chrome {
  position: fixed; top: 0; left: 0; right: 0; z-index: 20;
  display: flex; justify-content: space-between; align-items: center;
  padding: 26px 34px; pointer-events: none;
}
.brand { font-size: 15px; letter-spacing: .3em; }
.brand i { font-style: normal; color: var(--seal); margin: 0 .4em; }
.chapters { pointer-events: auto; }
.chapters a {
  color: var(--ink); text-decoration: none; font-size: 14px;
  letter-spacing: .2em; margin-left: 26px;
}
.chapters a:hover { color: var(--seal); }
#global-progress {
  position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 21;
  background: var(--ink); transform-origin: 0 50%; transform: scaleX(0);
}

/* ---------- 序幕(叠在长镜头第一帧上) ---------- */
.chapter-block.hero {
  left: 7vw; top: 24vh;
  align-items: flex-start; text-align: left; gap: 20px;
}
.intro-char {
  font-size: clamp(110px, 16vw, 210px); font-weight: 400; line-height: 1;
  text-shadow: 0 0 30px var(--paper), 0 0 70px var(--paper);
}
.intro-sub {
  font-size: clamp(16px, 2.2vw, 22px); letter-spacing: .55em; text-indent: .55em;
  color: var(--ink); text-shadow: 0 0 16px var(--paper), 0 0 40px var(--paper);
}
.intro-note {
  font-size: 13px; letter-spacing: .35em; text-indent: .35em; color: var(--ink-soft);
  text-shadow: 0 0 14px var(--paper);
}
.scroll-hint {
  position: absolute; bottom: 34px; left: 0; right: 0; text-align: center;
  font-size: 18px; color: var(--ink-soft);
  animation: hint 2.2s ease-in-out infinite; transition: opacity .5s;
}
@keyframes hint { 50% { opacity: .35; } }

/* ---------- 电影段:302 帧一镜到底 ---------- */
.cinematic { height: 1000vh; position: relative; }
.cinematic .sticky {
  position: sticky; top: 0; height: 100vh; overflow: hidden;
}
.cinematic canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }

.chapter-block {
  position: absolute; left: 7vw; top: 30vh;
  opacity: 0; will-change: opacity, transform;
  display: flex; flex-direction: column; gap: 14px;
}
.chapter-block.low { top: auto; bottom: 12vh; transform: none; }
.chapter-char {
  font-size: clamp(90px, 14vw, 180px); line-height: 1; color: var(--ink);
  text-shadow: 0 0 24px var(--paper), 0 0 56px var(--paper), 0 0 90px rgba(247,244,236,.75);
}
.chapter-cap {
  font-size: clamp(14px, 1.6vw, 18px); letter-spacing: .45em; color: #4d4a44;
  text-shadow: 0 0 14px var(--paper), 0 0 34px var(--paper);
}
.chapter-cap.solo { color: var(--ink); font-size: clamp(16px, 2vw, 22px); }

/* 转场引文:整幅居中(不用 transform,引擎会覆写它) */
.chapter-block.center {
  left: 0; right: 0; top: 9vh;
  align-items: center; text-align: center; gap: 18px;
}
.quote-line {
  font-size: clamp(24px, 3.6vw, 44px); letter-spacing: .3em; text-indent: .3em;
  text-shadow: 0 0 24px var(--paper), 0 0 56px var(--paper);
}
.quote-src {
  font-size: 13px; letter-spacing: .25em; color: var(--ink-soft);
  text-shadow: 0 0 14px var(--paper);
}

/* ---------- 跋 ---------- */
.outro {
  min-height: 90vh; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 30px; padding: 60px 20px;
}
.seal {
  width: 64px; height: 64px; background: var(--seal); color: var(--paper);
  display: flex; align-items: center; justify-content: center;
  font-size: 34px; border-radius: 4px;
}
.outro-line { font-size: clamp(17px, 2.4vw, 26px); letter-spacing: .28em; text-indent: .28em; }
.colophon { font-size: 12px; letter-spacing: .22em; color: var(--ink-soft); }

/* ---------- 进场 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 1s ease, transform 1s ease; }
.reveal.in { opacity: 1; transform: none; }

@media (max-width: 640px) {
  .chrome { padding: 18px 20px; }
  .chapter-block { left: 8vw; }
}