/* ============ 首屏 ============ */
.hero {
  position: relative;
  min-height: 100svh;
  padding: calc(var(--topbar-height) + 7vh) var(--space-gutter) 70px;
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 6vw;
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 78% 8%, rgba(207, 74, 43, 0.07), transparent 55%),
    radial-gradient(90% 70% at 12% 95%, rgba(165, 142, 94, 0.06), transparent 60%),
    var(--bg);
}
.hero::before {
  /* 巨幅水印「詞」 */
  content: "詞";
  position: absolute; right: -4vw; top: -8vh; z-index: 0;
  color: transparent;
  -webkit-text-stroke: 1px rgba(216, 210, 195, 0.06);
  font: 700 56vh/1 var(--font-display);
  pointer-events: none;
}
.hero-main { position: relative; z-index: 1; display: flex; flex-direction: column; }
.kicker {
  margin: 0 0 4vh;
  font: 11px var(--font-mono); letter-spacing: 0.32em;
  color: var(--muted);
}
.kicker b { color: var(--cinnabar); font-weight: 400; }
.hero-title {
  margin: 0;
  font: 600 var(--text-hero)/0.95 var(--font-display);
  letter-spacing: 0.02em;
  color: var(--paper);
  text-shadow: 0 0 80px rgba(207, 74, 43, 0.18);
}
.hero-sub {
  margin: 3vh 0 0;
  max-width: 520px;
  font: 11px/2 var(--font-mono); letter-spacing: 0.18em;
  color: var(--faint);
  text-transform: uppercase;
}
.hero-copy {
  margin: 4vh 0 0;
  padding-left: 20px;
  border-left: 2px solid var(--cinnabar);
  font: 18px/2.1 var(--font-kai);
  color: var(--text);
}
.hero-stats {
  margin-top: auto;
  padding-top: 6vh;
  display: flex; gap: clamp(28px, 4vw, 64px);
}
.hero-stats > div { display: grid; gap: 6px; }
.hero-stats > div + div { padding-left: clamp(28px, 4vw, 64px); border-left: 1px solid var(--hairline); }
.hero-stats b { font: 600 clamp(30px, 3.4vw, 46px)/1 var(--font-display); color: var(--paper); }
.hero-stats span { font: 10px var(--font-mono); letter-spacing: 0.2em; color: var(--muted); }

.hero-side {
  position: relative; z-index: 1;
  display: flex; align-items: flex-start; justify-content: flex-end;
  gap: clamp(20px, 3vw, 44px);
  padding-top: 4vh;
}
.vertical-note {
  margin: 0;
  writing-mode: vertical-rl;
  font: 17px/2 var(--font-kai);
  letter-spacing: 0.3em;
  color: var(--muted);
  border-left: 1px solid var(--hairline);
  padding-left: 22px;
  max-height: 420px;
}
.hero-side .seal { align-self: flex-end; margin-bottom: 8vh; }

/* 本日出土标本卡 */
.specimen {
  width: 230px;
  padding: 22px 22px 26px;
  text-align: left;
  color: var(--ink);
  border: 0;
  background:
    linear-gradient(160deg, var(--paper), var(--paper-2));
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.55);
  transform: rotate(-1.6deg);
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}
.specimen:hover { transform: rotate(0deg) translateY(-8px); box-shadow: 0 40px 90px rgba(0, 0, 0, 0.6); }
.sp-stamp {
  display: block; margin-bottom: 38px;
  font: 10px var(--font-mono); letter-spacing: 0.18em;
  color: var(--cinnabar-deep);
}
.specimen strong { display: block; font: 700 34px/1.2 var(--font-display); letter-spacing: 0.04em; }
.sp-score { display: block; margin-top: 10px; font: 11px var(--font-mono); color: #54503f; }
.sp-score b { font-size: 22px; color: var(--cinnabar-deep); }
.specimen small {
  display: block; margin-top: 18px; padding-top: 14px;
  border-top: 1px dashed var(--ink-hairline);
  font: 12px/1.9 var(--font-kai); color: #4d4839;
}
.downlink {
  position: absolute; left: 50%; bottom: 26px; z-index: 1;
  transform: translateX(-50%);
  font: 10px var(--font-mono); letter-spacing: 0.3em;
  color: var(--faint);
  transition: color var(--duration);
}
.downlink:hover { color: var(--cinnabar); }

/* ============ 何为词坟 ============ */
.about-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 6vw; }
.about-lead {
  margin: 0;
  font: 600 clamp(24px, 2.6vw, 36px)/1.7 var(--font-display);
  color: var(--paper);
}
.about-lead em { font-style: normal; color: var(--cinnabar); }
.about-copy p { margin: 0 0 22px; color: var(--muted); font-size: 15px; line-height: 2.1; }
.about-principles {
  margin-top: clamp(40px, 7vh, 72px);
  display: grid; grid-template-columns: repeat(3, 1fr);
  border-block: 1px solid var(--hairline);
}
.about-principles article { padding: 26px 28px; display: grid; gap: 8px; align-content: start; }
.about-principles article + article { border-left: 1px solid var(--hairline); }
.about-principles b { font: 600 19px var(--font-display); color: var(--paper); }
.about-principles span { color: var(--faint); font-size: 13px; }

/* ============ 文明时间轴 ============ */
.timeline-section { background: var(--bg-2); border-block: 1px solid var(--hairline); }
.timeline-stage {
  position: relative;
  padding: 34px 0 70px;
  border-block: 1px solid var(--hairline);
}
.timeline-years {
  display: flex; justify-content: space-between;
  font: 10px var(--font-mono); letter-spacing: 0.1em; color: var(--faint);
}
.civilization-track { position: relative; height: 452px; margin-top: 26px; }
.era-block {
  position: absolute; top: var(--top); left: var(--left);
  width: var(--width); min-width: 122px;
  padding: 14px 16px;
  text-align: left;
  color: var(--text);
  border: 1px solid var(--hairline-strong);
  background: color-mix(in srgb, var(--paper) 3%, transparent);
  transition: color var(--duration), background var(--duration), transform var(--duration), border-color var(--duration);
}
.era-block:hover, .era-block.active {
  z-index: 4;
  color: var(--ink);
  background: var(--paper);
  border-color: var(--paper);
  transform: translateY(-5px);
}
.era-block small { display: block; margin-bottom: 10px; font: 9px var(--font-mono); letter-spacing: 0.14em; opacity: 0.7; }
.era-block strong { display: block; font: 600 clamp(17px, 1.7vw, 26px)/1.2 var(--font-display); }
.era-block span { display: block; margin-top: 10px; font-size: 11px; line-height: 1.6; opacity: 0.6; }
.timeline-cursor {
  position: absolute; top: 22px; bottom: 46px; left: 80%;
  width: 1px; background: var(--cinnabar);
  pointer-events: none;
  transition: left 0.18s ease-out;
}
.timeline-cursor i {
  position: absolute; top: -5px; left: -5px;
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--cinnabar);
  box-shadow: 0 0 16px rgba(207, 74, 43, 0.7);
}
.timeline-cursor span {
  position: absolute; left: 10px; top: -8px;
  font: 9px var(--font-mono); letter-spacing: 0.1em;
  color: var(--cinnabar); white-space: nowrap;
}
#timelineRange {
  position: absolute; left: 0; right: 0; bottom: 20px;
  width: 100%;
  accent-color: var(--cinnabar);
  cursor: ew-resize;
}
.timeline-detail {
  min-height: 170px;
  padding-top: 34px;
  display: grid; grid-template-columns: 0.7fr 1.3fr; gap: 6vw;
}
.timeline-detail h3 { margin: 0; font: 600 clamp(26px, 3.4vw, 48px)/1.2 var(--font-display); color: var(--paper); }
.td-name span { display: block; margin-top: 10px; font: 11px var(--font-mono); letter-spacing: 0.14em; color: var(--faint); }
.td-body p { margin: 0; max-width: 700px; color: var(--muted); line-height: 2; }
.td-keywords { margin-top: 18px; font: 12px/1.9 var(--font-mono); color: var(--cinnabar); }

/* ============ 死亡学 ============ */
.lab-section { background: var(--bg-deep); border-bottom: 1px solid var(--hairline); }
.lab-grid { display: grid; grid-template-columns: 1fr 1.1fr; gap: 6vw; align-items: center; }
.formula-card {
  position: relative;
  padding: 54px 44px;
  color: var(--ink);
  background: linear-gradient(165deg, var(--paper), var(--paper-2));
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.6);
  transform: rotate(-1.2deg);
}
.formula-card .tape {
  position: absolute; top: -13px; left: 34%;
  padding: 8px 26px;
  border: 1px solid var(--cinnabar-deep);
  color: var(--cinnabar-deep);
  background: var(--paper);
  font: 9px var(--font-mono); letter-spacing: 0.24em;
  transform: rotate(2.4deg);
}
.formula-card > p { margin: 0 0 26px; font: 700 40px var(--font-display); }
.formula {
  display: flex; flex-wrap: wrap;
  gap: 10px 14px; align-items: center;
  font: 14px/1.7 var(--font-body); color: #45412f;
}
.formula b { font: 600 22px var(--font-display); color: var(--cinnabar-deep); }
.formula-note { margin: 26px 0 0; font: 12px/2 var(--font-mono); color: #6b6552; }
.meter-demo {
  margin-top: 44px;
  display: grid; grid-template-columns: auto 1fr auto; gap: 10px; align-items: center;
  font: 9px var(--font-mono);
}
.meter-demo i { height: 12px; padding: 2px; border: 1px solid var(--ink-hairline); }
.meter-demo i b { display: block; width: 78%; height: 100%; background: var(--cinnabar-deep); }
.lab-notes { display: grid; gap: 0; border-top: 1px solid var(--hairline); }
.lab-notes article { padding: 24px 0; display: grid; grid-template-columns: 52px 1fr; gap: 18px; border-bottom: 1px solid var(--hairline); }
.lab-notes b { font: 11px var(--font-mono); color: var(--cinnabar); padding-top: 8px; }
.lab-notes h3 { margin: 0 0 8px; font: 600 22px var(--font-display); color: var(--paper); }
.lab-notes p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.9; }

/* ============ 尾声 ============ */
.closing {
  min-height: 480px;
  display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: center;
  border-top: 1px solid var(--hairline);
}
.closing-line {
  margin: 0;
  font: 600 clamp(36px, 6vw, 88px)/1.3 var(--font-display);
  color: var(--paper);
}
.closing-line em { font-style: normal; color: var(--cinnabar); }
.closing .btn-round {
  width: 168px; height: 168px;
  border: 0; border-radius: 50%;
  color: #f3ece0; background: var(--cinnabar);
  font: 600 18px/1.6 var(--font-display); letter-spacing: 0.1em;
  box-shadow: 0 20px 60px rgba(207, 74, 43, 0.3);
  transform: rotate(4deg);
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}
.closing .btn-round:hover { transform: rotate(0deg) scale(1.05); box-shadow: 0 26px 70px rgba(207, 74, 43, 0.4); }
.closing small {
  grid-column: 1 / -1;
  font: 9px var(--font-mono); letter-spacing: 0.3em;
  color: var(--faint);
}