/* ============================================================
   RIMAC NEVERA — v1
   设计语言:雷暴蓝黑 + 电光青 / 45° 倒角切角 / 刻度尺数据条
   字体:RA-XCondensed(官方 Display) + TT Supermolot Neue(可变)
   参照:f80-site / chiron-super-sport-site 工程范式(自有气质)
   ============================================================ */

/* ---------- 字体 ---------- */
@font-face {
  font-family: 'Space Grotesk';
  src: url('../fonts/SpaceGrotesk-500.woff2') format('woff2');
  font-weight: 500; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'Space Grotesk';
  src: url('../fonts/SpaceGrotesk-600.woff2') format('woff2');
  font-weight: 600; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'Space Grotesk';
  src: url('../fonts/SpaceGrotesk-700.woff2') format('woff2');
  font-weight: 700; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'Inter Web';
  src: url('../fonts/Inter-400.woff2') format('woff2');
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'Inter Web';
  src: url('../fonts/Inter-500.woff2') format('woff2');
  font-weight: 500; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'Inter Web';
  src: url('../fonts/Inter-600.woff2') format('woff2');
  font-weight: 600; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono Web';
  src: url('../fonts/JetBrainsMono-400.woff2') format('woff2');
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono Web';
  src: url('../fonts/JetBrainsMono-500.woff2') format('woff2');
  font-weight: 500; font-style: normal; font-display: swap;
}

/* ---------- 变量 ---------- */
:root {
  --bg:        #04070c;
  --bg-soft:   #081019;
  --bg-deep:   #020509;
  --panel:     #0d1622;
  --panel-2:   #122030;
  --ink:       #edf4f9;
  --ink-dim:   #9db2c2;
  --ink-faint: #64798a;
  --accent:    #37e0ff;
  --accent-2:  #0a86b8;
  --accent-dim:rgba(55, 224, 255, 0.14);
  --line:      rgba(148, 196, 224, 0.14);
  --line-soft: rgba(148, 196, 224, 0.08);
  --font-display: 'Space Grotesk', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-text: 'Inter Web', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono Web', ui-monospace, 'Cascadia Mono', Consolas, 'Courier New', monospace;
  --w-doc: 1280px;
  --w-prose: 660px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-inout: cubic-bezier(0.65, 0, 0.35, 1);
}

/* ---------- 基础 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: auto; }
html, body { overflow-anchor: none; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-text);
  font-size: 17px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
::selection { background: var(--accent); color: #03151c; }
img { display: block; max-width: 100%; height: auto; }
video { display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; color: inherit; background: none; border: none; cursor: pointer; }
ul, ol { list-style: none; }
.mono { font-family: var(--font-mono); letter-spacing: 0.05em; }

.wrap { max-width: var(--w-doc); margin: 0 auto; padding: 0 clamp(1.25rem, 4.5vw, 3.5rem); }
.prose { max-width: var(--w-prose); }
.prose--center { margin: 0 auto; text-align: center; }

/* 刻度尺母题:一段横向刻度线 */
.ticks {
  height: 10px;
  background: repeating-linear-gradient(90deg,
    var(--line) 0 1px, transparent 1px 9px);
  position: relative;
}
.ticks::after {
  content: '';
  position: absolute; left: 0; right: 0; top: 3px; height: 1px;
  background: linear-gradient(90deg, var(--accent-2), transparent 70%);
}
.lbl {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}
.lbl::before { content: '// '; color: var(--ink-faint); }

/* ============ 顶栏 ============ */
.nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 22px 24px;
  transition: background 0.5s, padding 0.5s, backdrop-filter 0.5s, opacity 0.5s var(--ease), transform 0.5s var(--ease);
}
.nav.is-hero { opacity: 0; pointer-events: none; transform: translateY(-8px); }
.nav.is-solid {
  background: rgba(3, 6, 10, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 13px 24px;
  border-bottom: 1px solid var(--line);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.nav__brand { display: flex; align-items: baseline; gap: 12px; color: #fff; }
.nav__brand-mark {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--ink);
  line-height: 1;
}
.nav__brand-mark span { color: var(--accent); }
.nav__brand-sub {
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.3em;
  color: var(--ink-dim);
}
.nav__now {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--ink-dim);
  padding: 8px 14px;
  border: 1px solid var(--line);
  background: rgba(8, 16, 25, 0.6);
  white-space: nowrap;
  max-width: 36vw;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 0.3s, border-color 0.3s;
}
.nav__now::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(55, 224, 255, 0.9);
  flex-shrink: 0;
}
.nav__lang { justify-self: end; display: inline-flex; align-items: center; gap: 10px; }
.lang-btn {
  font-family: var(--font-mono);
  padding: 8px 6px;
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--ink-dim);
  position: relative;
  transition: color 0.3s;
}
.lang-btn::after {
  content: '';
  position: absolute; left: 6px; right: 6px; bottom: 4px; height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}
.lang-btn:hover { color: var(--ink); }
.lang-btn:hover::after { transform: scaleX(1); }
.nav__menu-btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--ink);
  padding: 8px 14px;
  border: 1px solid var(--line);
  background: rgba(8, 16, 25, 0.6);
  transition: border-color 0.3s;
}
.nav__menu-btn:hover { border-color: var(--accent-2); }
.nav__menu-icon { position: relative; width: 16px; height: 10px; }
.nav__menu-icon i {
  position: absolute; left: 0; width: 16px; height: 1px;
  background: currentColor;
  transition: transform 0.35s var(--ease), opacity 0.25s;
}
.nav__menu-icon i:first-child { top: 0; }
.nav__menu-icon i:nth-child(2) { top: 4.5px; }
.nav__menu-icon i:last-child { bottom: 0; }
.nav__menu-btn[aria-expanded="true"] i:first-child { transform: translateY(4.5px) rotate(45deg); }
.nav__menu-btn[aria-expanded="true"] i:nth-child(2) { opacity: 0; }
.nav__menu-btn[aria-expanded="true"] i:last-child { transform: translateY(-4.5px) rotate(-45deg); }
.nav__progress { position: absolute; left: 0; right: 0; bottom: 0; height: 2px; }
.nav__progress i {
  display: block; height: 100%; width: 0;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  box-shadow: 0 0 10px rgba(55, 224, 255, 0.55);
  transition: width 0.15s linear;
}

/* ============ 章节菜单浮层 ============ */
.menu-overlay {
  position: fixed; inset: 0; z-index: 90;
  background: rgba(2, 5, 9, 0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  opacity: 0; pointer-events: none;
  transition: opacity 0.45s var(--ease);
  display: flex; flex-direction: column; justify-content: center;
  padding: 0 clamp(1.5rem, 10vw, 8rem);
}
.menu-overlay.is-open { opacity: 1; pointer-events: auto; }
.menu-overlay__nav { display: flex; flex-direction: column; gap: 2px; }
.menu-overlay__nav a {
  display: flex; align-items: baseline; gap: 1.2rem;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 4vh, 2rem);
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--ink-dim);
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--line-soft);
  transform: translateX(-14px);
  opacity: 0;
  transition: color 0.3s, transform 0.5s var(--ease), opacity 0.5s var(--ease);
}
.menu-overlay.is-open .menu-overlay__nav a { transform: none; opacity: 1; }
.menu-overlay.is-open .menu-overlay__nav a:nth-child(1) { transition-delay: 0.05s; }
.menu-overlay.is-open .menu-overlay__nav a:nth-child(2) { transition-delay: 0.1s; }
.menu-overlay.is-open .menu-overlay__nav a:nth-child(3) { transition-delay: 0.15s; }
.menu-overlay.is-open .menu-overlay__nav a:nth-child(4) { transition-delay: 0.2s; }
.menu-overlay.is-open .menu-overlay__nav a:nth-child(5) { transition-delay: 0.25s; }
.menu-overlay.is-open .menu-overlay__nav a:nth-child(6) { transition-delay: 0.3s; }
.menu-overlay.is-open .menu-overlay__nav a:nth-child(7) { transition-delay: 0.35s; }
.menu-overlay.is-open .menu-overlay__nav a:nth-child(8) { transition-delay: 0.4s; }
.menu-overlay__nav a:hover { color: var(--ink); }
.menu-overlay__nav a .idx {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  min-width: 2.2em;
}
.menu-overlay__sub {
  margin-top: 2.4rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--ink-faint);
}

/* ============ 滚动进度表盘 ============ */
.scroll-gauge {
  position: fixed; right: 22px; bottom: 22px;
  width: 46px; height: 46px;
  z-index: 80;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
  pointer-events: none;
}
.scroll-gauge.is-on { opacity: 1; transform: none; }
.scroll-gauge svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.scroll-gauge circle { fill: none; stroke-width: 2; }
.scroll-gauge circle:first-child { stroke: var(--line); }
.scroll-gauge .sg__bar { stroke: var(--accent); stroke-dasharray: 119.4; stroke-dashoffset: 119.4; }
.scroll-gauge .sg__num {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-dim);
}

/* ============ HERO ============ */
.hero { position: relative; height: 100svh; min-height: 620px; overflow: hidden; background: var(--bg-deep); }
.hero__media { position: absolute; inset: 0; }
.hero__parallax { position: absolute; inset: 0; transform: scale(1.1); will-change: transform; }
.hero__parallax video, .hero__parallax img { width: 100%; height: 100%; object-fit: cover; }
.hero__veil {
  position: absolute; inset: 0;
  background:
    radial-gradient(120% 90% at 50% 10%, transparent 30%, rgba(2, 5, 9, 0.55) 78%, var(--bg-deep) 100%),
    linear-gradient(180deg, rgba(2,5,9,0.5) 0%, transparent 26%, transparent 55%, rgba(2,5,9,0.82) 100%);
}
.hero__content {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center;
  padding: 0 5vw;
}
.hero__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.42em;
  color: var(--ink-dim);
  margin-bottom: 2rem;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.8s var(--ease) 0.15s, transform 0.8s var(--ease) 0.15s;
}
.hero__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(3.6rem, 12.5vw, 10rem);
  line-height: 0.98;
  letter-spacing: 0.02em;
  color: #fff;
  text-shadow: 0 0 60px rgba(10, 134, 184, 0.35);
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 1s var(--ease) 0.3s, transform 1s var(--ease) 0.3s;
}
.hero__sub {
  margin-top: 1.4rem;
  font-size: clamp(1rem, 1.6vw, 1.2rem);
  color: var(--ink-dim);
  letter-spacing: 0.12em;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.9s var(--ease) 0.5s, transform 0.9s var(--ease) 0.5s;
}
.hero.is-in .hero__kicker,
.hero.is-in .hero__title,
.hero.is-in .hero__sub { opacity: 1; transform: none; }
.hero__stats {
  margin-top: 3.2rem;
  display: flex; align-items: stretch; gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  opacity: 0;
  transition: opacity 1s var(--ease) 0.75s;
}
.hero.is-in .hero__stats { opacity: 1; }
.hero__stats span {
  padding: 0.9rem 2.2rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--ink-dim);
  display: flex; flex-direction: column; gap: 0.3rem;
}
.hero__stats span + span { border-left: 1px solid var(--line); }
.hero__stats b {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink);
  line-height: 1;
}
.hero__stats b em { font-style: normal; color: var(--accent); }
.hero__scroll {
  position: absolute; left: 50%; bottom: 28px;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.4em;
  color: var(--ink-dim);
  display: flex; flex-direction: column; align-items: center; gap: 12px;
  transition: opacity 0.4s;
}
.hero__scroll::after {
  content: '';
  width: 1px; height: 44px;
  background: linear-gradient(180deg, var(--accent), transparent);
}

/* ============ 章节分隔页 ============ */
.chapter-break {
  position: relative;
  min-height: min(86vh, 760px);
  display: flex; align-items: center;
  background: var(--bg-soft);
  overflow: hidden;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.chapter-break--deep { background: var(--bg-deep); }
.chapter-break__wm {
  position: absolute; right: -1.5vw; bottom: -6vh;
  font-family: var(--font-display);
  font-size: clamp(11rem, 30vw, 26rem);
  line-height: 0.8;
  color: transparent;
  -webkit-text-stroke: 1px rgba(148, 196, 224, 0.1);
  user-select: none;
  pointer-events: none;
}
.chapter-break__inner {
  position: relative;
  width: 100%;
  max-width: var(--w-doc);
  margin: 0 auto;
  padding: clamp(4rem, 9vh, 7rem) clamp(1.25rem, 4.5vw, 3.5rem);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(1.6rem, 4vw, 3.4rem);
  align-items: start;
}
.chapter-break__no {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 5vw, 4.2rem);
  line-height: 1;
  color: var(--accent);
  border-top: 3px solid var(--accent);
  padding-top: 0.5rem;
}
.chapter-break h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2rem, 4.4vw, 3.4rem);
  line-height: 1.1;
  letter-spacing: 0.05em;
  color: var(--ink);
}
.chapter-break h2 .latin {
  display: block;
  margin-top: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.chapter-break__sub {
  margin-top: 1.4rem;
  max-width: 560px;
  color: var(--ink-dim);
  font-size: 0.98rem;
}
.chapter-break__ticks { position: absolute; left: 0; right: 0; top: 0; }

/* ============ 章节容器 ============ */
.chapter { padding: clamp(4.5rem, 10vh, 8rem) 0; background: var(--bg); }
.chapter--dark { background: var(--bg-soft); }
.chapter--deep { background: var(--bg-deep); }

/* ============ 文本组件 ============ */
.lead {
  font-size: clamp(1.12rem, 1.6vw, 1.32rem);
  line-height: 1.85;
  color: var(--ink);
}
.prose p + p { margin-top: 1.2em; }
.prose b { color: var(--accent); font-weight: 600; }
.prose .lead b { color: #fff; border-bottom: 2px solid var(--accent); padding-bottom: 1px; }

.quote {
  max-width: 760px;
  margin: clamp(2.5rem, 6vh, 4rem) auto;
  padding: 0 1rem;
  text-align: center;
}
.quote blockquote {
  font-size: clamp(1.15rem, 1.9vw, 1.45rem);
  line-height: 1.75;
  color: var(--ink);
  quotes: none;
}
.quote blockquote::before {
  content: '';
  display: block;
  width: 44px; height: 2px;
  margin: 0 auto 1.6rem;
  background: linear-gradient(90deg, var(--accent), transparent);
}
.quote figcaption {
  margin-top: 1.4rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--ink-faint);
}
.quote figcaption b { color: var(--accent); font-weight: 400; }
.quote__en {
  display: block;
  margin-top: 1rem;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--ink-faint);
  font-style: italic;
  text-align: center;
}

/* ============ 时间线(起源) ============ */
.tline { margin-top: clamp(2.5rem, 6vh, 4rem); }
.tline__item {
  display: grid;
  grid-template-columns: 92px 22px 1fr;
  gap: 0 1.2rem;
  padding: 1.05rem 0;
  border-bottom: 1px solid var(--line-soft);
}
.tline__item:first-child { border-top: 1px solid var(--line-soft); }
.tline__year {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--accent);
  line-height: 1.3;
}
.tline__node { position: relative; }
.tline__node::before {
  content: '';
  position: absolute; left: 50%; top: 0.65rem;
  width: 7px; height: 7px;
  transform: translateX(-50%) rotate(45deg);
  background: var(--accent);
  box-shadow: 0 0 10px rgba(55, 224, 255, 0.7);
}
.tline__node::after {
  content: '';
  position: absolute; left: 50%; top: 1.3rem; bottom: -1.2rem;
  width: 1px;
  background: var(--line);
}
.tline__item:last-child .tline__node::after { display: none; }
.tline__name { font-size: 1.05rem; color: var(--ink); font-weight: 600; }
.tline__name small { display: block; font-weight: 400; color: var(--ink-dim); font-size: 0.88rem; margin-top: 0.15rem; }

/* ============ 图文行 ============ */
.media-row {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: clamp(1.6rem, 4vw, 3.4rem);
  align-items: center;
  margin-top: clamp(2.6rem, 7vh, 4.6rem);
}
.media-row--flip { grid-template-columns: 5fr 7fr; }
.media-row--flip .media-row__media { order: 2; }
.media-row__media {
  position: relative;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
  background: var(--panel);
}
.media-row__media img, .media-row__media video { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.media-row__body h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.4rem, 2.2vw, 1.9rem);
  letter-spacing: 0.04em;
  color: var(--ink);
  margin-bottom: 0.9rem;
}
.media-row__body p { color: var(--ink-dim); }
.media-row__body p b { color: var(--ink); font-weight: 600; }
.kv { margin-top: 1.3rem; border-top: 1px solid var(--line-soft); }
.kv li {
  display: flex; justify-content: space-between; gap: 1.4rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 0.9rem;
}
.kv li span { color: var(--ink-faint); font-family: var(--font-mono); letter-spacing: 0.08em; }
.kv li b { color: var(--ink); font-weight: 500; text-align: right; }

/* ============ 图片组 ============ */
.figrow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(0.9rem, 2vw, 1.4rem);
  margin-top: clamp(2.2rem, 6vh, 3.6rem);
}
.figrow--2 { grid-template-columns: repeat(2, 1fr); }
.figure { position: relative; }
.figure__media {
  position: relative;
  background: var(--panel);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  overflow: hidden;
}
.figure__media img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.9s var(--ease); }
.figure:hover .figure__media img { transform: scale(1.035); }
.figrow .figure__media { aspect-ratio: 4 / 3; }
.figrow--2 .figure__media { aspect-ratio: 16 / 9; }
.figure__cap {
  display: flex; gap: 0.8rem; align-items: baseline;
  margin-top: 0.7rem;
  font-size: 0.82rem;
  color: var(--ink-faint);
}
.figure__cap .no {
  font-family: var(--font-mono);
  color: var(--accent);
  letter-spacing: 0.12em;
}

/* ============ 倒角卡片组(dcards) ============ */
.dcards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(0.9rem, 2vw, 1.3rem);
  margin-top: clamp(2.2rem, 6vh, 3.6rem);
}
.dcards--3 { grid-template-columns: repeat(3, 1fr); }
.dcard {
  background: var(--panel);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  position: relative;
  transition: transform 0.5s var(--ease);
}
.dcard:hover { transform: translateY(-5px); }
.dcard img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.dcard--wide img { aspect-ratio: 16 / 10; }
.dcard__body { padding: 1.15rem 1.2rem 1.3rem; }
.dcard__body .no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--accent);
}
.dcard__body h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: 0.05em;
  margin: 0.5rem 0 0.55rem;
  color: var(--ink);
}
.dcard__body p { font-size: 0.88rem; color: var(--ink-dim); line-height: 1.7; }
.dcard__body p b { color: var(--ink); font-weight: 600; }

/* ============ 大数字带 ============ */
.bigstats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: clamp(2.4rem, 6vh, 3.8rem);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.bigstats__item {
  padding: 1.5rem 1.2rem;
  text-align: center;
}
.bigstats__item + .bigstats__item { border-left: 1px solid var(--line); }
.bigstats__item b {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  line-height: 1.05;
  letter-spacing: 0.04em;
  color: var(--ink);
}
.bigstats__item b em { font-style: normal; color: var(--accent); }
.bigstats__item span {
  display: block;
  margin-top: 0.5rem;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.22em;
  color: var(--ink-faint);
}

/* ============ 全出血视频节 ============ */
.vsection {
  position: relative;
  height: min(86vh, 760px);
  margin: clamp(3rem, 8vh, 5.5rem) 0;
  overflow: hidden;
  background: var(--bg-deep);
}
.vsection video, .vsection img { width: 100%; height: 100%; object-fit: cover; }
.vsection__veil {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(2,5,9,0.55) 0%, rgba(2,5,9,0.1) 40%, rgba(2,5,9,0.75) 100%);
}
.vsection__content {
  position: absolute; left: clamp(1.5rem, 6vw, 5rem); bottom: clamp(2rem, 7vh, 4rem);
  max-width: 620px;
}
.vsection__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.36em;
  color: var(--accent);
  margin-bottom: 1rem;
}
.vsection__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.8rem, 3.4vw, 2.8rem);
  letter-spacing: 0.04em;
  color: #fff;
  line-height: 1.15;
}
.vsection__text { margin-top: 0.9rem; color: var(--ink-dim); max-width: 520px; }

/* ============ 扭矩矢量实验台(签名交互) ============ */
.torquelab {
  margin-top: clamp(2.6rem, 7vh, 4.4rem);
  background: var(--panel);
  border: 1px solid var(--line);
  position: relative;
  display: grid;
  grid-template-columns: 11fr 9fr;
  gap: 0;
}
.torquelab::before {
  content: '';
  position: absolute; top: -1px; right: -1px;
  width: 26px; height: 26px;
  background: linear-gradient(135deg, var(--panel) 46%, var(--accent) 46%, var(--accent) 54%, transparent 54%);
}
.torquelab__stage {
  padding: clamp(1.4rem, 3vw, 2.6rem);
  border-right: 1px solid var(--line-soft);
  position: relative;
}
.torquelab__stage svg { width: 100%; height: auto; display: block; }
.torquelab__badge {
  position: absolute; top: 1.1rem; left: 1.3rem;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.3em;
  color: var(--ink-faint);
}
.tl-car__body { fill: url(#tlBody); stroke: rgba(148, 196, 224, 0.45); stroke-width: 1.6; }
.tl-car__cabin { fill: url(#tlGlass); stroke: rgba(55, 224, 255, 0.45); stroke-width: 1; }
.tl-car__center { stroke: rgba(148, 196, 224, 0.25); stroke-width: 1; stroke-dasharray: 5 7; }
.tl-detail { fill: rgba(148, 196, 224, 0.3); }
.tl-wing { fill: #0a121e; stroke: rgba(148, 196, 224, 0.4); stroke-width: 1; }
.tl-wheel { fill: #060b12; stroke: rgba(148, 196, 224, 0.35); stroke-width: 1; }
.tl-rim { fill: #0d1622; stroke: rgba(148, 196, 224, 0.16); stroke-width: 1; }
.tl-wheelbar { fill: url(#tlBarGrad); filter: url(#tlGlow); }
.tl-chip { fill: rgba(13, 22, 34, 0.72); stroke: rgba(148, 196, 224, 0.16); stroke-width: 1; }
.tl-wheeltxt { fill: var(--ink-dim); font-family: var(--font-mono); font-size: 13px; letter-spacing: 1.5px; }
.tl-wheeltxt--val { fill: var(--accent); }
.torquelab__panel { padding: clamp(1.4rem, 3vw, 2.4rem); display: flex; flex-direction: column; }
.torquelab__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.5rem;
  letter-spacing: 0.05em;
  color: var(--ink);
}
.torquelab__desc { font-size: 0.86rem; color: var(--ink-dim); margin-top: 0.5rem; line-height: 1.7; }
.torquelab__presets { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1.2rem; }
.torquelab__preset {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  padding: 0.55rem 0.95rem;
  border: 1px solid var(--line);
  color: var(--ink-dim);
  transition: color 0.25s, border-color 0.25s, background 0.25s;
}
.torquelab__preset:hover { color: var(--ink); border-color: var(--accent-2); }
.torquelab__preset.is-on {
  color: #03151c;
  background: var(--accent);
  border-color: var(--accent);
}
.torquelab__sliders { margin-top: 1.5rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.9rem 1.6rem; }
.torquelab__sl { display: flex; flex-direction: column; gap: 0.35rem; }
.torquelab__sl label {
  display: flex; justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--ink-dim);
}
.torquelab__sl label b { color: var(--accent); font-weight: 400; }
.torquelab__sl input[type="range"] {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 22px;
  background: transparent;
  cursor: pointer;
}
.torquelab__sl input[type="range"]::-webkit-slider-runnable-track {
  height: 3px;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
}
.torquelab__sl input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 14px; height: 14px;
  margin-top: -5.5px;
  background: var(--bg);
  border: 2px solid var(--accent);
  transform: rotate(45deg);
}
.torquelab__sl input[type="range"]::-moz-range-track {
  height: 3px;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
}
.torquelab__sl input[type="range"]::-moz-range-thumb {
  width: 12px; height: 12px;
  background: var(--bg);
  border: 2px solid var(--accent);
  border-radius: 0;
  transform: rotate(45deg);
}
.torquelab__readout {
  margin-top: auto;
  padding-top: 1.4rem;
  display: flex; gap: 2rem; align-items: baseline;
  border-top: 1px solid var(--line-soft);
}
.torquelab__readout div b {
  display: block;
  font-family: var(--font-display);
  font-size: 1.7rem;
  color: var(--ink);
  line-height: 1.1;
}
.torquelab__readout div b em { font-style: normal; color: var(--accent); }
.torquelab__readout div span {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.22em;
  color: var(--ink-faint);
}
.torquelab__note {
  margin-top: 1rem;
  font-size: 0.76rem;
  color: var(--ink-faint);
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

/* ============ 纪录数据条(0-400-0) ============ */
.databar { margin-top: clamp(2.4rem, 6vh, 3.8rem); }
.databar__row {
  display: grid;
  grid-template-columns: 210px 1fr 110px;
  align-items: center;
  gap: 1.2rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line-soft);
}
.databar__row:first-of-type { border-top: 1px solid var(--line-soft); }
.databar__name { font-size: 0.92rem; color: var(--ink-dim); }
.databar__name small { display: block; font-family: var(--font-mono); font-size: 10.5px; color: var(--ink-faint); letter-spacing: 0.14em; margin-top: 2px; }
.databar__row--hl .databar__name { color: var(--ink); }
.databar__track {
  position: relative;
  height: 12px;
  background: rgba(148, 196, 224, 0.07);
  clip-path: polygon(0 0, calc(100% - 6px) 0, 100% 100%, 0 100%);
}
.databar__fill {
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 0;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  transition: width 1.9s var(--ease);
}
.databar__row--hl .databar__fill { box-shadow: 0 0 16px rgba(55, 224, 255, 0.45); }
.databar__val {
  font-family: var(--font-mono);
  font-size: 1.02rem;
  color: var(--ink);
  text-align: right;
}
.databar__val em { font-style: normal; color: var(--ink-faint); font-size: 0.78em; }
.databar__row--hl .databar__val { color: var(--accent); }

/* ============ 纪录表 ============ */
.rec-table { margin-top: clamp(2.2rem, 6vh, 3.4rem); }
.rec-table__head, .rec-table__row {
  display: grid;
  grid-template-columns: 1fr 150px 150px;
  gap: 1rem;
  padding: 0.62rem 0.9rem;
  align-items: baseline;
}
.rec-table__head {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--ink-faint);
  border-bottom: 1px solid var(--line);
}
.rec-table__row { border-bottom: 1px solid var(--line-soft); transition: background 0.25s; }
.rec-table__row:hover { background: rgba(55, 224, 255, 0.04); }
.rec-table__row .k { color: var(--ink-dim); font-size: 0.92rem; }
.rec-table__row .v {
  font-family: var(--font-mono);
  color: var(--ink);
  text-align: right;
}
.rec-table__row .v small { color: var(--ink-faint); font-size: 0.76em; }
.rec-table__row .d {
  font-family: var(--font-mono);
  color: var(--accent);
  text-align: right;
}
.rec-table__row .d small { color: var(--ink-faint); font-size: 0.76em; }
.rec-table__fine {
  margin-top: 0.9rem;
  font-size: 0.76rem;
  color: var(--ink-faint);
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

/* ============ 纪录卡(hcards) ============ */
.hcards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(0.9rem, 2vw, 1.3rem);
  margin-top: clamp(2.2rem, 6vh, 3.4rem);
}
.hcard {
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--accent-2);
  padding: 1.4rem 1.4rem 1.5rem;
  position: relative;
  transition: transform 0.45s var(--ease), border-color 0.3s;
}
.hcard:hover { transform: translateY(-4px); border-top-color: var(--accent); }
.hcard__year {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.26em;
  color: var(--accent);
}
.hcard h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.35rem;
  letter-spacing: 0.05em;
  margin: 0.6rem 0 0.7rem;
  color: var(--ink);
}
.hcard__num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--ink-faint);
  margin-bottom: 0.7rem;
}
.hcard p { font-size: 0.88rem; color: var(--ink-dim); line-height: 1.7; }

/* ============ 圆环数据(gauges) ============ */
.gauges {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.2rem;
  margin-top: clamp(2.4rem, 6vh, 3.8rem);
}
.gauge { text-align: center; }
.gauge__svg { position: relative; width: 100%; max-width: 210px; margin: 0 auto; }
.gauge__svg svg { width: 100%; height: auto; transform: rotate(-90deg); }
.gauge__track { fill: none; stroke: rgba(148, 196, 224, 0.1); stroke-width: 6; }
.gauge__bar {
  fill: none; stroke: var(--accent); stroke-width: 6; stroke-linecap: butt;
  stroke-dasharray: 527.8;
  stroke-dashoffset: 527.8;
}
.gauge.is-on .gauge__bar {
  stroke-dashoffset: var(--gauge-off, 0);
  transition: stroke-dashoffset 2s var(--ease);
}
.gauge__svg figcaption {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.gauge__svg figcaption b {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 3vw, 2.5rem);
  font-weight: 600;
  color: var(--ink);
  line-height: 1;
}
.gauge__label {
  margin-top: 0.8rem;
  font-size: 0.88rem;
  color: var(--ink-dim);
}
.gauge__label small { display: block; color: var(--ink-faint); font-size: 0.78rem; margin-top: 2px; }

/* ============ 规格页签 ============ */
.specs-tabs { margin-top: clamp(2.4rem, 6vh, 3.8rem); }
.specs-tabs__nav { display: flex; gap: 0.5rem; border-bottom: 1px solid var(--line); }
.specs-tabs__btn {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  padding: 0.7rem 1.4rem 0.75rem;
  position: relative;
  transition: color 0.3s;
}
.specs-tabs__btn::after {
  content: '';
  position: absolute; left: 0; right: 0; bottom: -1px; height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform 0.4s var(--ease);
}
.specs-tabs__btn:hover { color: var(--ink-dim); }
.specs-tabs__btn.is-on { color: var(--ink); }
.specs-tabs__btn.is-on::after { transform: scaleX(1); }
.specs-tabs__panel { display: none; padding-top: 1.2rem; }
.specs-tabs__panel.is-on { display: block; animation: tabIn 0.5s var(--ease); }
@keyframes tabIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}
.specs__group { max-width: 880px; }
.specs__row {
  display: grid;
  grid-template-columns: minmax(200px, 2fr) 3fr;
  gap: 1.4rem;
  padding: 0.66rem 0.2rem;
  border-bottom: 1px solid var(--line-soft);
  font-size: 0.94rem;
}
.specs__row .k { color: var(--ink-dim); }
.specs__row .k small { color: var(--ink-faint); font-family: var(--font-mono); font-size: 0.78em; margin-left: 0.4em; }
.specs__row .v {
  font-family: var(--font-mono);
  color: var(--ink);
  letter-spacing: 0.02em;
  text-align: right;
}
.specs__row--hl { background: rgba(55, 224, 255, 0.045); }
.specs__row--hl .k { color: var(--ink); }
.specs__row--hl .v { color: var(--accent); }
.fine {
  margin-top: 1.6rem;
  font-size: 0.8rem;
  color: var(--ink-faint);
  line-height: 1.8;
}
.fine a { color: var(--accent); border-bottom: 1px solid rgba(55, 224, 255, 0.35); }

/* ============ 页脚 ============ */
.footer { background: var(--bg-deep); border-top: 1px solid var(--line-soft); }
.footer__portal {
  padding: clamp(3.5rem, 9vh, 6rem) 0;
  text-align: center;
  border-bottom: 1px solid var(--line-soft);
}
.footer__portal-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.4em;
  color: var(--ink-faint);
}
.footer__portal-title {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink);
  margin: 0.8rem 0 0.4rem;
}
.footer__portal-title .footer__portal-dot { color: var(--accent); }
.footer__portal-sub { color: var(--ink-dim); font-size: 0.92rem; }
.footer__portal-btn {
  display: inline-block;
  margin-top: 1.6rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.26em;
  color: var(--ink);
  padding: 0.85rem 1.8rem;
  border: 1px solid var(--line);
  transition: border-color 0.3s, color 0.3s, background 0.3s;
}
.footer__portal-btn:hover { border-color: var(--accent); color: var(--accent); }
.footer__contact { padding: 2.8rem 0 0; }
.footer__contact-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.4em;
  color: var(--ink-faint);
  margin-bottom: 1.1rem;
}
.footer__contact-btns { display: flex; gap: 1rem; flex-wrap: wrap; }
.sbtn {
  display: inline-flex; align-items: center; gap: 0.9rem;
  padding: 0.9rem 1.3rem;
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color 0.3s, transform 0.3s var(--ease);
}
.sbtn:hover { border-color: var(--accent-2); transform: translateY(-2px); }
.sbtn__txt { display: flex; flex-direction: column; line-height: 1.3; }
.sbtn__txt b { font-family: var(--font-mono); font-size: 0.82rem; letter-spacing: 0.18em; color: var(--ink); }
.sbtn__txt small { font-size: 0.72rem; color: var(--ink-faint); }
.sbtn__arrow { color: var(--accent); font-style: normal; }
.footer__top {
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  padding: 2.6rem 0 1.6rem;
}
.footer__brand {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--ink-dim);
}
.footer__links { display: flex; gap: 1.4rem; }
.footer__links a {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--ink-faint);
  transition: color 0.25s;
}
.footer__links a:hover { color: var(--accent); }
.footer__disclaimer {
  padding: 1.4rem 0 2.8rem;
  border-top: 1px solid var(--line-soft);
}
.footer__disclaimer p {
  font-size: 0.78rem;
  color: var(--ink-faint);
  line-height: 1.9;
}
.footer__disclaimer a { color: var(--ink-dim); border-bottom: 1px solid var(--line); }
.footer__disclaimer .mono { margin-top: 0.7rem; display: block; font-size: 0.74rem; }

/* ============ reveal 动效(三形态) ============ */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.8s var(--ease), transform 0.8s var(--ease); }
.reveal--left { transform: translateX(-34px); }
.reveal--right { transform: translateX(34px); }
/* 裁切入场作用于内部图片(元素自身不裁切,避免 IO 判为零交集) */
.reveal--clip { transform: none; opacity: 1; }
.reveal--clip .figure__media img { clip-path: inset(0 100% 0 0); transition: clip-path 1.1s var(--ease); }
.reveal--clip.is-in .figure__media img { clip-path: inset(0 0 0 0); }
.reveal--zoom { transform: scale(0.94); }
.reveal.is-in { opacity: 1; transform: none; clip-path: inset(0 0 0 0); }
.reveal[data-stagger="1"] { transition-delay: 0.08s; }
.reveal[data-stagger="2"] { transition-delay: 0.16s; }
.reveal[data-stagger="3"] { transition-delay: 0.24s; }

/* ============ 响应式 ============ */
@media (max-width: 1080px) {
  .dcards { grid-template-columns: repeat(2, 1fr); }
  .torquelab { grid-template-columns: 1fr; }
  .torquelab__stage { border-right: 0; border-bottom: 1px solid var(--line-soft); }
}

@media (max-width: 980px) {
  body { font-size: 16px; }
  .chapter-break__bg { display: none; }
  .nav__brand-sub { display: none; }
  .nav__now { max-width: 42vw; font-size: 11px; }
  .hero__stats span { padding: 0.8rem 1.1rem; font-size: 10.5px; }
  .hero__stats b { font-size: 1.5rem; }
  .chapter-break__inner { grid-template-columns: 1fr; gap: 1rem; }
  .chapter-break__no { font-size: 2.2rem; }
  .media-row, .media-row--flip { grid-template-columns: 1fr; }
  .media-row--flip .media-row__media { order: 0; }
  .figrow, .figrow--2 { grid-template-columns: 1fr 1fr; }
  .bigstats { grid-template-columns: 1fr 1fr; }
  .bigstats__item:nth-child(3) { border-left: 0; }
  .bigstats__item:nth-child(n+3) { border-top: 1px solid var(--line); }
  .gauges { grid-template-columns: 1fr 1fr; gap: 2rem 1rem; }
  .hcards { grid-template-columns: 1fr; }
  .databar__row { grid-template-columns: 1fr; gap: 0.5rem; }
  .databar__val { text-align: left; }
  .rec-table__head { display: none; }
  .rec-table__row { grid-template-columns: 1fr auto; }
  .rec-table__row .d { grid-column: 2; grid-row: 1; }
  .rec-table__row .v { grid-column: 1 / -1; text-align: left; }
  .vsection { height: 66vh; }
  .scroll-gauge { display: none; }
  .torquelab__sliders { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .figrow, .figrow--2 { grid-template-columns: 1fr; }
  .dcards, .dcards--3 { grid-template-columns: 1fr; }
  .hero__stats { flex-direction: column; width: min(78vw, 320px); }
  .hero__stats span { align-items: center; }
  .hero__stats span + span { border-left: 0; border-top: 1px solid var(--line); }
  .torquelab__sliders { grid-template-columns: 1fr; }
  .torquelab__readout { gap: 1.2rem; flex-wrap: wrap; }
  .tline__item { grid-template-columns: 70px 16px 1fr; }
  .tline__year { font-size: 1.2rem; }
}

/* ============ 动效增强 ============ */
/* 章节分隔页视频背景(移动端隐藏) */
.chapter-break--video { background: var(--bg-deep); }
.chapter-break__bg {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  opacity: 0.62;
  filter: saturate(1.02);
}
.chapter-break--video::before {
  content: '';
  position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(90deg, rgba(2,5,9,0.72) 0%, rgba(2,5,9,0.22) 55%, rgba(2,5,9,0.48) 100%);
}
.chapter-break--video .chapter-break__inner,
.chapter-break--video .chapter-break__ticks { position: relative; z-index: 2; }
.chapter-break--video .chapter-break__wm { z-index: 2; }

/* 章节分隔页与全屏视频文案入场 */
.chapter-break__inner, .vsection__content {
  opacity: 0; transform: translateY(20px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}
.chapter-break__inner.is-in, .vsection__content.is-in { opacity: 1; transform: none; }

/* 媒体 hover 微缩放 */
.media-row__media img, .media-row__media video { transition: transform 1.2s var(--ease); }
.media-row:hover .media-row__media img,
.media-row:hover .media-row__media video { transform: scale(1.03); }

/* 纪录表逐行入场 */
.rec-table .rec-table__row { opacity: 0; transform: translateX(-10px); transition: opacity 0.5s var(--ease), transform 0.5s var(--ease); }
.rec-table.is-in .rec-table__row { opacity: 1; transform: none; }
.rec-table.is-in .rec-table__row:nth-child(2) { transition-delay: 0.06s; }
.rec-table.is-in .rec-table__row:nth-child(3) { transition-delay: 0.12s; }
.rec-table.is-in .rec-table__row:nth-child(4) { transition-delay: 0.18s; }
.rec-table.is-in .rec-table__row:nth-child(5) { transition-delay: 0.24s; }
.rec-table.is-in .rec-table__row:nth-child(6) { transition-delay: 0.3s; }
.rec-table.is-in .rec-table__row:nth-child(7) { transition-delay: 0.36s; }
.rec-table.is-in .rec-table__row:nth-child(8) { transition-delay: 0.42s; }
.rec-table.is-in .rec-table__row:nth-child(9) { transition-delay: 0.48s; }
.rec-table.is-in .rec-table__row:nth-child(10) { transition-delay: 0.54s; }
.rec-table.is-in .rec-table__row:nth-child(11) { transition-delay: 0.6s; }

/* 卡片 3D 倾斜(JS 驱动) */
.dcard, .hcard { will-change: transform; }

/* 光标光晕 */
.cursor-glow {
  position: fixed; top: 0; left: 0;
  width: 460px; height: 460px;
  margin: -230px 0 0 -230px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(55,224,255,0.07) 0%, rgba(10,134,184,0.045) 35%, transparent 65%);
  pointer-events: none;
  z-index: 60;
  mix-blend-mode: screen;
  opacity: 0;
  transition: opacity 0.8s;
}
.cursor-glow.is-on { opacity: 1; }
@media (pointer: coarse) { .cursor-glow { display: none; } }

/* hero stats 逐项入场 */
.hero__stats span { opacity: 0; transform: translateY(10px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.hero.is-in .hero__stats span { opacity: 1; transform: none; }
.hero.is-in .hero__stats span:nth-child(1) { transition-delay: 0.85s; }
.hero.is-in .hero__stats span:nth-child(2) { transition-delay: 0.97s; }
.hero.is-in .hero__stats span:nth-child(3) { transition-delay: 1.09s; }
.hero.is-in .hero__stats span:nth-child(4) { transition-delay: 1.21s; }

/* 章节水印可被 JS 视差驱动 */
.chapter-break__wm { will-change: transform; }

/* ============ 减少动效 ============ */
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1 !important; transform: none !important; clip-path: none !important; transition: none !important; }
  .databar__fill { transition: none; }
  .hero__title, .hero__kicker, .hero__sub, .hero__stats { transition: none; opacity: 1; transform: none; }
  .chapter-break__inner, .vsection__content, .hero__stats span, .rec-table .rec-table__row { opacity: 1 !important; transform: none !important; transition: none !important; }
  .chapter-break__bg { display: none; }
}
/* ---------- HYPERCAR 门户跳转 ---------- */
.portal-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  width: fit-content;
  max-width: calc(100% - 48px);
  margin: 52px auto 20px;
  padding: 15px 40px;
  border: 1.5px solid var(--accent, var(--blue-lux, var(--red, var(--gold))));
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.045);
  color: var(--ink-dim, var(--dim));
  font-family: var(--font-mono, var(--mono));
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-decoration: none;
  transition: border-color .35s, color .35s, background .35s, transform .35s;
}
.portal-bar:hover { transform: translateY(-2px); background: rgba(255, 255, 255, 0.09); }
.portal-bar__rule {
  width: 36px;
  height: 1px;
  flex: none;
  background: linear-gradient(90deg, transparent, var(--accent, var(--blue-lux, var(--red, var(--gold)))));
}
.portal-bar__rule--r { background: linear-gradient(90deg, var(--accent, var(--blue-lux, var(--red, var(--gold)))), transparent); }
.portal-bar__badge {
  width: 24px;
  height: 24px;
  border-radius: 7px;
  flex: none;
  display: grid;
  place-items: center;
  background: var(--accent, var(--blue-lux, var(--red, var(--gold))));
  color: #0b0b0e;
  font-size: 13px;
  font-weight: 700;
  box-shadow: 0 0 14px var(--accent, var(--blue-lux, var(--red, var(--gold))));
}
.portal-bar__name {
  color: var(--accent, var(--blue-lux, var(--red, var(--gold))));
  font-weight: 700;
  letter-spacing: 0.24em;
  white-space: nowrap;
}
.portal-bar__sep {
  width: 1px;
  height: 16px;
  flex: none;
  background: var(--line);
}
.portal-bar__text {
  color: var(--ink-dim, var(--dim));
  letter-spacing: 0.12em;
  white-space: nowrap;
}
.portal-bar__arrow { font-style: normal; transition: transform .35s; }
.portal-bar:hover .portal-bar__arrow { transform: translateX(4px); }
@media (max-width: 720px) {
  .portal-bar { flex-wrap: wrap; justify-content: center; text-align: center; margin: 30px 20px 14px; padding: 13px 26px; gap: 12px; }
  .portal-bar__rule { display: none; }
  .portal-bar__text { white-space: normal; }
}