/* ============================================================
   Bugatti Tourbillon · 中文介绍站
   深色 · 精密机械 · 品牌蓝 #004bfa
   ============================================================ */

@font-face {
  font-family: 'BUGATTI Display';
  src: url('../fonts/bugatti-display-400.woff2') format('woff2');
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: 'BUGATTI Text';
  src: url('../fonts/bugatti-text-400.woff2') format('woff2');
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: 'BUGATTI Text';
  src: url('../fonts/bugatti-text-700.woff2') format('woff2');
  font-weight: 700;
  font-display: swap;
}
@font-face {
  font-family: 'BUGATTI Mono';
  src: url('../fonts/bugatti-mono-400.woff2') format('woff2');
  font-weight: 400;
  font-display: swap;
}

:root {
  --bg: #050507;
  --bg2: #0a0b0f;
  --panel: #12141c;
  --line: rgba(255, 255, 255, 0.12);
  --line2: rgba(255, 255, 255, 0.22);
  --blue: #004bfa;
  --blue-soft: rgba(0, 75, 250, 0.16);
  --txt: #f2f2f5;
  --dim: #a9a9b3;
  --faint: #7d7d88;
  --display: 'BUGATTI Display', 'Archivo', 'Helvetica Neue', Arial, sans-serif;
  --text: 'BUGATTI Text', 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --mono: 'BUGATTI Mono', ui-monospace, 'Cascadia Mono', Consolas, 'Courier New', monospace;
  --ease: cubic-bezier(0.65, 0, 0.35, 1);
  --ease2: cubic-bezier(0.22, 1, 0.36, 1);
}

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

/* 禁用浏览器滚动锚定：防止点击/悬停引发的任何布局变化导致页面自动滚动 */
html, body { overflow-anchor: none; }
html { scroll-behavior: auto; }

body {
  background: var(--bg);
  color: var(--txt);
  font-family: var(--text);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: var(--blue); color: #fff; }

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; color: inherit; background: none; border: none; cursor: pointer; }

.mono { font-family: var(--mono); letter-spacing: 0.04em; }

.wrap {
  width: min(1280px, calc(100% - 48px));
  margin: 0 auto;
}

.section { padding: 120px 0; position: relative; }

/* 明亮层次：部分章节加入微弱的蓝色光晕与浅色卡片背景 */
#performance, #specs, #china, #tour {
  background: linear-gradient(180deg, rgba(0, 75, 250, 0.05), transparent 45%);
}
.sec-tag {
  color: #6f9dff;
  text-shadow: 0 0 14px rgba(0, 75, 250, 0.5);
  font-size: 12px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.sec-title { color: #fff; }

.sec-title {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(40px, 6vw, 76px);
  line-height: 1.08;
  letter-spacing: 0.01em;
  margin-bottom: 26px;
}
.sec-title-en {
  display: block;
  font-size: 0.42em;
  color: var(--dim);
  margin-top: 10px;
  letter-spacing: 0.14em;
}

.sec-lead {
  color: var(--dim);
  font-size: 19px;
  max-width: 640px;
  margin-bottom: 56px;
}

/* ---------- 滚动显现 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 0.9s var(--ease2), transform 0.9s var(--ease2);
}
.reveal.is-in { opacity: 1; transform: none; }

/* ---------- 自定义光标 ---------- */
.cursor {
  position: fixed;
  top: 0; left: 0;
  width: 34px; height: 34px;
  margin: -17px 0 0 -17px;
  pointer-events: none;
  z-index: 9999;
  opacity: 0;
  transition: opacity 0.4s;
  mix-blend-mode: difference;
}
.cursor span {
  position: absolute;
  inset: 0;
  border: 1px solid rgba(255, 255, 255, 0.85);
  border-radius: 50%;
  transform: scale(0.4);
  transition: transform 0.35s var(--ease);
}
.cursor span::before, .cursor span::after {
  content: '';
  position: absolute;
  background: rgba(255, 255, 255, 0.85);
}
.cursor span::before { left: 50%; top: -5px; bottom: -5px; width: 1px; transform: translateX(-50%); }
.cursor span::after { top: 50%; left: -5px; right: -5px; height: 1px; transform: translateY(-50%); }
.cursor.is-on { opacity: 1; }
.cursor.is-on span { transform: scale(1); }
.cursor.is-hot span { transform: scale(1.7); border-color: #fff; }
@media (pointer: coarse) { .cursor { display: none; } }

/* ---------- 导航 ---------- */
.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;
}
.nav.is-solid {
  background: rgba(5, 5, 7, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 14px 24px;
  border-bottom: 1px solid var(--line);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; }
.nav__brand { display: flex; align-items: baseline; gap: 12px; color: #fff; }
.nav__brand svg { height: 18px; width: auto; }
.nav__brand-sub {
  font-family: var(--display);
  font-size: 15px;
  letter-spacing: 0.34em;
  color: var(--dim);
}
.nav__dots { display: flex; gap: 18px; align-items: center; }
.nav__dots a { position: relative; display: block; width: 8px; height: 8px; }
.nav__dots i {
  position: absolute;
  inset: 0;
  border: 1px solid var(--line2);
  border-radius: 50%;
  transition: background 0.3s, border-color 0.3s, transform 0.3s;
}
.nav__dots a:hover i { transform: scale(1.35); }
.nav__dots a.is-active i {
  background: var(--blue);
  border-color: var(--blue);
  box-shadow: 0 0 10px rgba(0, 75, 250, 0.7);
}
.nav__dots a::after {
  content: attr(data-label);
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%) translateX(6px);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--txt);
  background: var(--panel);
  border: 1px solid var(--line2);
  padding: 3px 8px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s;
}
.nav__dots a:hover::after { opacity: 1; transform: translateY(-50%) translateX(0); }

/* ---------- 滚动进度表盘 ---------- */
.scroll-gauge {
  position: fixed;
  right: 26px;
  bottom: 26px;
  width: 44px; height: 44px;
  z-index: 90;
  opacity: 0;
  transition: opacity 0.5s;
}
.scroll-gauge.is-on { opacity: 1; }
.scroll-gauge svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.scroll-gauge circle { fill: none; stroke-width: 2; }
.scroll-gauge .sg__track { stroke: var(--line); }
.scroll-gauge .sg__bar {
  stroke: var(--blue);
  stroke-linecap: round;
  stroke-dasharray: 119.4;
  stroke-dashoffset: 119.4;
}
.sg__num {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 10px;
  color: var(--dim);
}

/* ---------- HERO ---------- */
.hero {
  position: relative;
  height: 100svh;
  min-height: 640px;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}
.hero__media { position: absolute; inset: 0; }
.hero__video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05);
}
.hero__veil {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 90% at 50% 110%, rgba(5, 5, 7, 0.95) 0%, rgba(5, 5, 7, 0.55) 45%, rgba(5, 5, 7, 0.25) 75%, rgba(5, 5, 7, 0.4) 100%),
    linear-gradient(to top, var(--bg) 0%, transparent 28%);
}
.hero__content {
  position: relative;
  z-index: 2;
  width: min(1280px, calc(100% - 48px));
  margin: 0 auto;
  padding-bottom: 88px;
}
.hero__kicker {
  font-size: 13px;
  letter-spacing: 0.32em;
  color: var(--dim);
  margin-bottom: 18px;
  opacity: 0;
  animation: heroIn 1s var(--ease2) 0.2s forwards;
}
.hero__title {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(64px, 13vw, 172px);
  line-height: 0.95;
  letter-spacing: 0.02em;
  color: #fff;
  opacity: 0;
  animation: heroIn 1.1s var(--ease2) 0.35s forwards;
}
.hero__sub {
  font-family: var(--display);
  font-size: clamp(18px, 2.4vw, 30px);
  letter-spacing: 0.22em;
  color: var(--blue);
  margin-top: 14px;
  opacity: 0;
  animation: heroIn 1.1s var(--ease2) 0.5s forwards;
}
.hero__desc {
  margin-top: 26px;
  color: var(--dim);
  font-size: 16px;
  max-width: 560px;
  opacity: 0;
  animation: heroIn 1.1s var(--ease2) 0.65s forwards;
}
.hero__specs {
  margin-top: 34px;
  display: flex;
  gap: 44px;
  opacity: 0;
  animation: heroIn 1.1s var(--ease2) 0.8s forwards;
}
.hero__specs span { color: var(--txt); font-size: 15px; letter-spacing: 0.1em; }
.hero__specs b { font-family: var(--display); font-size: 34px; font-weight: 400; color: #fff; margin-right: 4px; }
@keyframes heroIn { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: none; } }

.hero__scroll {
  position: absolute;
  right: 28px;
  bottom: 30px;
  z-index: 2;
  writing-mode: vertical-rl;
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--dim);
  display: flex;
  gap: 10px;
  align-items: center;
  opacity: 0;
  animation: heroIn 1s var(--ease2) 1.4s forwards;
}
.hero__line {
  width: 1px;
  height: 56px;
  background: var(--line2);
  position: relative;
  overflow: hidden;
}
.hero__line::after {
  content: '';
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--blue);
  animation: lineFall 2.2s var(--ease) infinite;
}
@keyframes lineFall { 0% { top: -100%; } 60%, 100% { top: 100%; } }

/* ---------- 传承 ---------- */
.heritage__row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 72px;
}
.hcard {
  position: relative;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--panel), rgba(14, 16, 22, 0.4));
  padding: 36px 30px 34px;
  transition: border-color 0.4s, transform 0.4s var(--ease);
}
.hcard:hover { border-color: var(--line2); transform: translateY(-6px); }
.hcard__year { font-size: 12px; color: var(--faint); letter-spacing: 0.24em; }
.hcard h3 { font-family: var(--display); font-weight: 400; font-size: 34px; margin: 14px 0 8px; letter-spacing: 0.04em; }
.hcard__num { font-size: 26px; color: var(--blue); margin-bottom: 16px; }
.hcard p:last-child { color: var(--dim); font-size: 16px; }
.hcard--now { border-color: rgba(0, 75, 250, 0.45); }
.hcard--now::before {
  content: '';
  position: absolute;
  top: -1px; left: -1px; right: -1px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--blue), transparent);
}

/* ---------- 引言 ---------- */
.quote {
  border-left: 2px solid var(--blue);
  padding: 10px 0 10px 30px;
  max-width: 860px;
}
.quote p {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(20px, 2.6vw, 30px);
  line-height: 1.5;
  color: var(--txt);
  letter-spacing: 0.01em;
}
.quote b { color: #fff; }
.quote footer {
  margin-top: 18px;
  font-family: var(--mono);
  font-size: 14px;
  color: var(--dim);
  letter-spacing: 0.08em;
}

/* ---------- 数据表盘 ---------- */
.gauges {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin: 48px 0 24px;
  justify-items: center;
}
.gauge {
  text-align: center;
  position: relative;
}
.gauge__svg {
  position: relative;
  width: min(200px, 100%);
  margin: 0 auto;
}
.gauge__svg svg {
  display: block;
  width: 100%;
  height: auto;
}
.gauge circle { fill: none; stroke-width: 7; }
.gauge__track { stroke: rgba(255, 255, 255, 0.06); }
.gauge__bar {
  stroke: var(--blue);
  stroke-linecap: round;
  stroke-dasharray: 527.8;
  stroke-dashoffset: 527.8;
  filter: drop-shadow(0 0 6px rgba(0, 75, 250, 0.55));
}
.gauge figcaption {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  pointer-events: none;
}
.gauge figcaption b {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(30px, 3.6vw, 46px);
  color: #fff;
  letter-spacing: 0.02em;
}
.gauge__unit { display: block; font-size: 13px; color: var(--dim); margin-top: 2px; letter-spacing: 0.2em; }
.gauge__label {
  margin-top: 18px;
  font-size: 16px;
  color: var(--txt);
  letter-spacing: 0.12em;
}
.gauge__label small { display: block; color: var(--dim); font-size: 13px; margin-top: 6px; letter-spacing: 0.06em; font-weight: 400; }
.specs__note { color: var(--faint); font-size: 12px; }

/* ---------- 设计 ---------- */
.design__hero {
  position: relative;
  margin: 40px 0 60px;
  overflow: hidden;
}
.design__hero img {
  width: 100%;
  height: clamp(320px, 56vw, 680px);
  object-fit: cover;
  filter: saturate(0.8) contrast(1.06);
}
.design__hero figcaption, .interior__hero figcaption, .china__img figcaption, .manu__img figcaption {
  position: absolute;
  left: 20px;
  bottom: 16px;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: rgba(255, 255, 255, 0.65);
}
.design__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 72px;
}
.dcard {
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
  transition: border-color 0.4s, transform 0.3s var(--ease);
  will-change: transform;
}
.dcard:hover { border-color: rgba(0, 75, 250, 0.5); }
.dcard img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(0.75);
  transition: transform 0.8s var(--ease2), filter 0.8s;
}
.dcard:hover img { transform: scale(1.06); filter: saturate(1); }
.dcard h3 {
  font-family: var(--display);
  font-weight: 400;
  font-size: 20px;
  letter-spacing: 0.06em;
  margin: 22px 20px 8px;
}
.dcard p { color: var(--dim); font-size: 15px; margin: 0 20px 24px; }

/* ---------- 动力总成 ---------- */
.pt__viewer {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 0;
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}
.pt__stage { position: relative; min-height: 420px; overflow: hidden; background: #000; }
.pt__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transform: scale(1.06);
  transition: opacity 0.7s var(--ease2), transform 1.4s var(--ease2);
  filter: saturate(0.75) contrast(1.05);
}
.pt__img.is-active { opacity: 1; transform: none; }
.pt__stage-tag {
  position: absolute;
  left: 18px;
  top: 16px;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: #fff;
  background: rgba(5, 5, 7, 0.7);
  border: 1px solid var(--line2);
  padding: 6px 12px;
  backdrop-filter: blur(6px);
}
.pt__panel { padding: 36px 34px; display: flex; flex-direction: column; }
.pt__tabs { display: flex; gap: 8px; margin-bottom: 30px; flex-wrap: wrap; }
.pt__tabs button {
  font-size: 13px;
  letter-spacing: 0.18em;
  padding: 9px 18px;
  border: 1px solid var(--line2);
  color: var(--dim);
  transition: all 0.3s;
}
.pt__tabs button:hover { border-color: var(--txt); color: var(--txt); }
.pt__tabs button.is-active { background: var(--blue); border-color: var(--blue); color: #fff; }
.pt__data { display: none; }
.pt__data.is-active { display: block; animation: fadeUp 0.6s var(--ease2); }
@keyframes fadeUp { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.pt__big {
  font-family: var(--display);
  font-size: clamp(44px, 5vw, 64px);
  color: #fff;
  margin-bottom: 22px;
}
.pt__list { list-style: none; margin-bottom: 20px; }
.pt__list li {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  letter-spacing: 0.06em;
}
.pt__list li span { color: var(--faint); }
.pt__list li b { color: var(--txt); font-weight: 400; }
.pt__note { color: var(--dim); font-size: 14px; }

/* ---------- 性能 ---------- */
.perf__img {
  margin-bottom: 48px;
  overflow: hidden;
  position: relative;
}
.perf__img img {
  width: 100%;
  height: clamp(280px, 44vw, 520px);
  object-fit: cover;
  filter: saturate(0.8);
}
.modes { display: grid; grid-template-columns: 300px 1fr; gap: 36px; align-items: start; }
.modes__tabs { display: flex; flex-direction: column; gap: 8px; }
.modes__tabs button {
  text-align: left;
  font-size: 14px;
  letter-spacing: 0.22em;
  padding: 14px 18px;
  border: 1px solid var(--line);
  color: var(--dim);
  transition: all 0.3s;
}
.modes__tabs button:hover { border-color: var(--line2); color: var(--txt); }
.modes__tabs button.is-active { border-color: var(--blue); color: #fff; background: var(--blue-soft); }
.modes__panel { border: 1px solid var(--line); background: var(--panel); padding: 34px; min-height: 170px; }
.modes__panel-title { font-family: var(--display); font-size: 24px; margin-bottom: 12px; letter-spacing: 0.04em; }
.modes__panel-desc { color: var(--dim); font-size: 15px; max-width: 560px; }
.perf__note { color: var(--faint); font-size: 12px; margin-top: 28px; }

/* ---------- 内饰 ---------- */
.interior__hero {
  position: relative;
  margin: 48px 0 64px;
  overflow: hidden;
}
.interior__hero img {
  width: 100%;
  height: clamp(340px, 60vw, 700px);
  object-fit: cover;
  filter: saturate(0.78) contrast(1.04);
}
.hotspot {
  position: absolute;
  transform: translate(-50%, -50%);
  cursor: help;
  z-index: 5;
}
.hotspot__dot {
  display: block;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid #fff;
  background: var(--blue);
  box-shadow: 0 0 0 0 rgba(0, 75, 250, 0.6);
  animation: pulse 2.4s var(--ease) infinite;
  transition: transform 0.3s;
}
.hotspot:hover .hotspot__dot { transform: scale(1.5); }
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(0, 75, 250, 0.55); }
  70% { box-shadow: 0 0 0 18px rgba(0, 75, 250, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 75, 250, 0); }
}
.hotspot::after {
  content: attr(data-title);
  position: absolute;
  left: 50%;
  bottom: calc(100% + 14px);
  transform: translateX(-50%) translateY(6px);
  background: rgba(5, 5, 7, 0.92);
  border: 1px solid var(--line2);
  padding: 10px 14px;
  width: max-content;
  max-width: 260px;
  font-family: var(--text);
  font-size: 13px;
  color: var(--txt);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s, transform 0.3s;
}
.hotspot::before {
  content: attr(data-text);
  position: absolute;
  left: 50%;
  bottom: calc(100% + 60px);
  transform: translateX(-50%) translateY(6px);
  background: rgba(5, 5, 7, 0.95);
  border: 1px solid var(--blue);
  padding: 12px 16px;
  width: max-content;
  max-width: 300px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--dim);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s, transform 0.3s 0.05s;
}
.hotspot:hover::before, .hotspot:hover::after { opacity: 1; transform: translateX(-50%) translateY(0); }

.interior__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 44px;
  margin-bottom: 56px;
}
.interior__text h3 { font-family: var(--display); font-weight: 400; font-size: 26px; margin-bottom: 14px; letter-spacing: 0.03em; }
.interior__text p { color: var(--dim); font-size: 15px; }
.interior__gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-bottom: 72px;
}
.interior__gallery img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(0.75);
  transition: filter 0.6s, transform 0.8s var(--ease2);
}
.interior__gallery img:hover { filter: saturate(1.05); transform: scale(1.03); }

/* ---------- 空气动力学 ---------- */
.aero__split {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 0;
  align-items: stretch;
}
.aero__img { position: relative; overflow: hidden; min-height: 420px; }
.aero__img img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.75) contrast(1.05);
}
.aero__list { display: flex; flex-direction: column; gap: 0; }
.aero__list article {
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
}
.aero__list h3 { font-size: 15px; letter-spacing: 0.16em; color: var(--blue); margin-bottom: 10px; }
.aero__list p { color: var(--dim); font-size: 16px; max-width: 480px; }

/* ---------- 测试（水平滚动） ---------- */
.hscroll {
  position: relative;
  margin-top: 56px;
  overflow: hidden;
  cursor: grab;
}
.hscroll.is-dragging { cursor: grabbing; }
.hscroll__track {
  display: flex;
  gap: 22px;
  padding: 0 max(24px, calc((100vw - 1280px) / 2 + 24px)) 40px;
  width: max-content;
  will-change: transform;
}
.tcard {
  width: min(430px, 82vw);
  flex-shrink: 0;
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color 0.4s;
}
.tcard:hover { border-color: rgba(0, 75, 250, 0.5); }
.tcard img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.75);
}
.tcard h3 { font-size: 14px; letter-spacing: 0.18em; color: var(--blue); margin: 22px 24px 10px; }
.tcard p { color: var(--dim); font-size: 15px; margin: 0 24px 26px; }
.hscroll__bar {
  height: 2px;
  background: var(--line);
  margin: 0 max(24px, calc((100vw - 1280px) / 2 + 24px));
  position: relative;
  overflow: hidden;
}
.hscroll__bar i {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 120px;
  background: var(--blue);
  transition: transform 0.2s linear;
}

/* ---------- 定制 ---------- */
.bespoke__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 48px;
}
.bespoke__img { position: relative; overflow: hidden; }
.bespoke__img img {
  width: 100%;
  height: clamp(300px, 42vw, 480px);
  object-fit: cover;
  filter: saturate(0.78);
}
.bespoke__img figcaption { margin-top: 12px; font-size: 11px; letter-spacing: 0.2em; color: var(--faint); }
.bespoke__data { display: flex; flex-direction: column; gap: 16px; }
.bstat {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 22px 26px;
  display: grid;
  grid-template-columns: 130px 1fr;
  align-items: baseline;
  gap: 8px 16px;
  transition: border-color 0.35s;
}
.bstat:hover { border-color: rgba(0, 75, 250, 0.5); }
.bstat span { font-size: 12px; letter-spacing: 0.22em; color: var(--faint); grid-row: 1 / 3; }
.bstat b {
  font-family: var(--display);
  font-weight: 400;
  font-size: 26px;
  color: #fff;
  letter-spacing: 0.03em;
}
.bstat small { color: var(--dim); font-size: 14px; }
.bespoke__lead { color: var(--dim); font-size: 16px; max-width: 760px; }

/* ---------- 中国 ---------- */
.china { background: linear-gradient(180deg, var(--bg), var(--bg2) 60%, var(--bg)); }
.china__inner {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 56px;
  align-items: center;
}
.china__desc { color: var(--dim); font-size: 16px; margin-bottom: 22px; max-width: 520px; }
.china__img { position: relative; overflow: hidden; }
.china__img img {
  width: 100%;
  height: clamp(320px, 46vw, 540px);
  object-fit: cover;
  filter: saturate(0.78);
}

/* ---------- 工厂 ---------- */
.manu__img {
  position: relative;
  margin: 48px 0 56px;
  overflow: hidden;
}
.manu__img img {
  width: 100%;
  height: clamp(320px, 50vw, 600px);
  object-fit: cover;
  filter: saturate(0.75) contrast(1.04);
}
.manu__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-bottom: 44px;
}
.manu__note {
  color: var(--dim);
  font-size: 15px;
  max-width: 860px;
  border-left: 2px solid var(--blue);
  padding-left: 24px;
}

/* ---------- FOOTER ---------- */
.footer {
  border-top: 1px solid var(--line);
  padding: 56px 0 40px;
}
.footer__top {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}
.footer__brand { font-size: 13px; letter-spacing: 0.3em; color: var(--dim); }
.footer__links { display: flex; gap: 26px; }
.footer__links a {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--txt);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, color 0.3s;
}
.footer__links a:hover { border-color: var(--blue); color: #fff; }
.footer__disclaimer p {
  color: var(--dim);
  font-size: 13px;
  line-height: 1.9;
  max-width: 860px;
}
.footer__disclaimer p.mono { margin-top: 14px; color: var(--faint); }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .gauges { grid-template-columns: repeat(2, 1fr); gap: 40px 24px; }
  .design__grid { grid-template-columns: repeat(2, 1fr); }
  .pt__viewer { grid-template-columns: 1fr; }
  .pt__stage { min-height: 320px; }
  .aero__split { grid-template-columns: 1fr; }
  .aero__img { min-height: 300px; }
  .bespoke__grid { grid-template-columns: 1fr; }
  .china__inner { grid-template-columns: 1fr; }
  .interior__row { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .section { padding: 84px 0; }
  .heritage__row { grid-template-columns: 1fr; }
  .modes { grid-template-columns: 1fr; }
  .interior__gallery { grid-template-columns: 1fr; }
  .manu__stats { grid-template-columns: 1fr; }
  .nav__dots { display: none; }
  .hero__specs { gap: 26px; flex-wrap: wrap; }
  .design__grid { grid-template-columns: 1fr; }
  .hscroll__track { padding-left: 24px; }
  .wrap { width: calc(100% - 40px); }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .reveal { opacity: 1; transform: none; }
  .gauge__bar { stroke-dashoffset: 0; }
  .cursor { display: none; }
}

/* ============================================================
   v2 · 展开详情（.more-btn / .more-panel）
   ============================================================ */

/* ============================================================
   v3 · 组件样式
   ============================================================ */
/* 正文双栏 */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 44px;
  margin: 48px 0;
}
.two-col p, .story__lead p {
  color: var(--dim);
  font-size: 16.5px;
  line-height: 2;
}
.two-col p b, .story__lead p b { color: var(--txt); font-weight: 700; }
.story__lead {
  max-width: 860px;
  margin-bottom: 52px;
}
.story__lead p { margin-bottom: 18px; }
.story__note {
  margin-top: 30px;
  color: var(--dim);
  font-size: 15px;
  line-height: 1.9;
  max-width: 860px;
  border-left: 2px solid var(--line2);
  padding-left: 20px;
}
@media (max-width: 900px) { .two-col { grid-template-columns: 1fr; } }

/* 详情条目列表 */
.detail-list {
  list-style: none;
  margin: 56px 0;
  border-top: 1px solid var(--line);
}
.detail-list li {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 22px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  color: var(--dim);
  font-size: 15.5px;
  line-height: 1.8;
  transition: background 0.3s, padding-left 0.3s;
}
.detail-list li:hover { background: var(--blue-soft); padding-left: 10px; }
.detail-list li b {
  color: #fff;
  font-size: 14px;
  letter-spacing: 0.2em;
  padding: 5px 12px;
  background: var(--blue-soft);
  border-left: 2px solid var(--blue);
  justify-self: start;
  align-self: center;
}

/* 媒体块（章节视频） */
.media-block {
  position: relative;
  margin: 64px 0;
  border: 1px solid var(--line);
  background: #000;
  overflow: hidden;
}
.media-block__video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: #000;
}
.media-block__cap {
  padding: 14px 20px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--faint);
  border-top: 1px solid var(--line);
}

/* 动力：主图 + 三栏卡片 */
.pt__main {
  position: relative;
  margin: 56px 0 40px;
  overflow: hidden;
}
.pt__main img {
  width: 100%;
  height: clamp(300px, 46vw, 560px);
  object-fit: cover;
  filter: saturate(0.78) contrast(1.05);
}
.pt__main figcaption {
  position: absolute;
  left: 20px;
  bottom: 16px;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: rgba(255, 255, 255, 0.7);
}
.pt__three {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-bottom: 64px;
}
.ptcard {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 28px 26px;
  transition: border-color 0.35s, transform 0.35s var(--ease);
}
.ptcard:hover { border-color: rgba(0, 75, 250, 0.55); transform: translateY(-4px); }
.ptcard h3 { font-size: 12px; letter-spacing: 0.24em; color: var(--blue); margin-bottom: 14px; }
.ptcard__big { font-family: var(--display); font-size: 42px; color: #fff; margin-bottom: 16px; }
.ptcard ul { list-style: none; margin-bottom: 14px; }
.ptcard li {
  color: var(--txt);
  font-size: 15px;
  padding: 7px 0;
  border-bottom: 1px solid var(--line);
}
.ptcard__note { color: var(--dim); font-size: 14px; line-height: 1.8; }
@media (max-width: 900px) { .pt__three { grid-template-columns: 1fr; } }

/* 马力对比条 */
.compare {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 34px 34px 26px;
  margin-bottom: 48px;
}
.compare h3 { font-size: 12px; letter-spacing: 0.26em; color: var(--faint); margin-bottom: 26px; }
.compare__row {
  display: grid;
  grid-template-columns: 170px 1fr 90px;
  align-items: center;
  gap: 18px;
  margin-bottom: 18px;
}
.compare__label { font-size: 12px; letter-spacing: 0.1em; color: var(--dim); }
.compare__val { font-size: 14px; color: var(--txt); text-align: right; }
.compare__track {
  height: 6px;
  background: rgba(255, 255, 255, 0.06);
  position: relative;
  overflow: hidden;
}
.compare__track i {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: var(--blue);
  transition: width 1.6s var(--ease2);
}
.compare__row:nth-child(4) .compare__track i { background: linear-gradient(90deg, var(--blue), #3f7bff); }
.compare.is-in .compare__track i { width: var(--w); }
@media (max-width: 720px) {
  .compare__row { grid-template-columns: 1fr; gap: 6px; }
  .compare__val { text-align: left; }
}

/* 驾驶模式三卡 */
.modes__head { margin: 56px 0 24px; color: var(--txt); font-family: var(--display); font-weight: 400; font-size: 22px; }
.modes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-bottom: 40px;
}
.modecard {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 30px 28px;
  position: relative;
  transition: border-color 0.35s, transform 0.35s var(--ease), background 0.35s;
}
.modecard:hover { border-color: var(--blue); background: var(--blue-soft); transform: translateY(-4px); }
.modecard h4 { font-size: 14px; letter-spacing: 0.3em; color: var(--blue); margin-bottom: 12px; }
.modecard__sub { color: var(--txt); font-size: 17px; margin-bottom: 12px; font-weight: 700; }
.modecard p:last-child { color: var(--dim); font-size: 15px; line-height: 1.9; }
@media (max-width: 900px) { .modes { grid-template-columns: 1fr; } }

/* 技术规格表 */
.spec-table { margin: 48px 0 20px; border-top: 1px solid var(--line); }
.spec-table__row {
  display: grid;
  grid-template-columns: 210px 1fr;
  gap: 24px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
  transition: background 0.3s, padding-left 0.3s;
}
.spec-table__row:hover { background: var(--blue-soft); padding-left: 26px; }
.spec-table__row span { font-size: 12px; letter-spacing: 0.2em; color: var(--faint); }
.spec-table__row b { color: var(--txt); font-weight: 400; font-size: 16px; }
@media (max-width: 720px) {
  .spec-table__row { grid-template-columns: 1fr; gap: 4px; padding: 14px 12px; }
}

/* 巡展画廊 */
.china__gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 64px;
}
.china__gallery img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.75);
  transition: filter 0.6s, transform 0.8s var(--ease2);
}
.china__gallery img:hover { filter: saturate(1.05); transform: scale(1.02); }
@media (max-width: 900px) { .china__gallery { grid-template-columns: 1fr; } }

/* 减少动效 */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .reveal { opacity: 1; transform: none; }
  .gauge__bar { stroke-dashoffset: 0; }
  .cursor { display: none; }
}

/* ---------- v4 · 金句英文原文 ---------- */
.quote__en {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--faint);
  font-style: italic;
  letter-spacing: 0.02em;
  max-width: 720px;
}

/* ---------- v4 · 巡展足迹 ---------- */
.tour__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  padding: 0 max(24px, calc((100vw - 1280px) / 2 + 24px));
  margin-top: 56px;
}
.tour__card img { aspect-ratio: 3 / 2; }
.tour__card p { font-size: 13.5px; }
@media (max-width: 1080px) { .tour__grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .tour__grid { grid-template-columns: 1fr; } }

/* ---------- v4 · 品牌与社区图组 ---------- */
.community__pics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 56px;
}
.community__pics img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  filter: saturate(0.75);
  transition: filter 0.6s, transform 0.8s var(--ease2);
}
.community__pics img:hover { filter: saturate(1.05); transform: scale(1.02); }
@media (max-width: 900px) { .community__pics { grid-template-columns: 1fr; } }

/* ---------- v6 · 自动播放背景视频 ---------- */
.media-block--auto {
  margin: 0;
  border: none;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.media-block--auto .media-block__video {
  aspect-ratio: 21 / 9;
  filter: saturate(0.9) contrast(1.02);
}
@media (max-width: 900px) {
  .media-block--auto .media-block__video { aspect-ratio: 16 / 9; }
}

/* ---------- v6 · 鼠标光斑 ---------- */
.glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 520px;
  height: 520px;
  margin: -260px 0 0 -260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 75, 250, 0.07), rgba(0, 75, 250, 0.02) 45%, transparent 70%);
  pointer-events: none;
  z-index: 1;
  opacity: 0;
  transition: opacity 0.8s;
  will-change: transform;
}
.glow.is-on { opacity: 1; }
@media (pointer: coarse) { .glow { display: none; } }

/* ---------- v6 · 图片进入视口缩放 ---------- */
.zoom {
  opacity: 0;
  transform: scale(1.06);
  transition: opacity 1s var(--ease2), transform 1.6s var(--ease2);
}
.zoom.is-in { opacity: 1; transform: none; }

/* ============================================================
   v7 · 章节导航（索引栏 / 移动菜单）与官方细节卡片
   ============================================================ */
/* 桌面端章节索引栏：默认收起为右侧窄进度条，悬停展开列表（防误触跳转） */
.index-rail {
  position: fixed;
  right: 0;
  left: auto;
  top: 50%;
  transform: translateY(-50%);
  z-index: 95;
  width: 30px;
  padding: 18px 0 14px;
  border: none;
  border-left: 1px solid var(--line);
  background: rgba(10, 11, 15, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 0;
  overflow: hidden;
  opacity: 0;
  transform: translateY(-50%) translateX(10px);
  transition: opacity 0.6s, transform 0.6s, width 0.45s var(--ease2);
}
.index-rail.is-on { opacity: 1; transform: translateY(-50%) translateX(0); }
.index-rail:hover { width: 172px; }
/* 收起态的垂直进度线 */
.index-rail::before {
  content: '';
  position: absolute;
  right: 14px;
  top: 22px;
  bottom: 42px;
  width: 2px;
  background: rgba(255, 255, 255, 0.1);
}
.index-rail::after {
  content: '';
  position: absolute;
  right: 14px;
  top: 22px;
  width: 2px;
  height: 0;
  background: var(--blue);
  box-shadow: 0 0 8px rgba(0, 75, 250, 0.7);
  transition: height 0.2s linear;
}
.index-rail__title {
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--faint);
  padding: 0 12px 8px;
  border-bottom: 1px solid var(--line);
  margin: 0 12px 4px;
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.3s 0.15s;
}
.index-rail:hover .index-rail__title { opacity: 1; }
.index-rail__nav {
  display: flex;
  flex-direction: column;
  padding: 0 12px;
  opacity: 0;
  transform: translateX(10px);
  transition: opacity 0.3s 0.1s, transform 0.3s 0.1s;
}
.index-rail:hover .index-rail__nav { opacity: 1; transform: none; }
.index-rail__nav a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 5px 6px;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--dim);
  border-left: 2px solid transparent;
  transition: color 0.3s, border-color 0.3s, padding-left 0.3s;
  white-space: nowrap;
}
.index-rail__nav a .idx { font-family: var(--mono); font-size: 10px; color: var(--faint); }
.index-rail__nav a:hover { color: var(--txt); }
.index-rail__nav a.is-active {
  color: #fff;
  border-left-color: var(--blue);
  padding-left: 10px;
  background: linear-gradient(90deg, var(--blue-soft), transparent);
}
.index-rail__nav a.is-active .idx { color: #6f9dff; }
.index-rail__progress {
  margin-top: 6px;
  padding: 6px 12px 0;
  border-top: 1px solid var(--line);
  text-align: right;
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.3s 0.15s;
}
.index-rail:hover .index-rail__progress { opacity: 1; }
.index-rail__progress span { font-size: 10px; color: var(--faint); }
@media (max-width: 1279px) { .index-rail { display: none; } }

/* 移动端菜单按钮：所有屏幕显示，进入缘起后才可见 */
.nav__menu-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  letter-spacing: 0.24em;
  color: var(--txt);
  padding: 8px 14px;
  border: 1px solid var(--line2);
  background: rgba(10, 11, 15, 0.6);
  transition: border-color 0.3s, opacity 0.6s var(--ease2);
}
.nav__menu-btn:hover { border-color: var(--blue); }
.nav__menu-btn.is-hidden {
  opacity: 0;
  pointer-events: none;
}
.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);
}
.nav__menu-icon i:first-child { top: 0; }
.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:last-child { transform: translateY(-4.5px) rotate(-45deg); }

/* 移动端全屏菜单 */
.menu-overlay {
  position: fixed;
  inset: 0;
  z-index: 89;
  background: rgba(5, 5, 7, 0.97);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: grid;
  place-items: center;
  opacity: 0;
  transition: opacity 0.4s var(--ease2);
}
.menu-overlay.is-open { opacity: 1; }
.menu-overlay__nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(140px, 220px));
  gap: 6px 40px;
  padding: 24px;
}
.menu-overlay__nav a {
  display: flex;
  gap: 12px;
  padding: 14px 10px;
  font-family: var(--display);
  font-size: 22px;
  letter-spacing: 0.1em;
  color: var(--txt);
  border-bottom: 1px solid var(--line);
  transition: color 0.3s, border-color 0.3s, padding-left 0.3s;
}
.menu-overlay__nav a:hover { color: #6f9dff; border-color: var(--blue); padding-left: 16px; }
.menu-overlay__nav a .idx { font-family: var(--mono); font-size: 12px; color: var(--faint); align-self: center; }
@media (max-width: 640px) {
  .menu-overlay__nav { grid-template-columns: 1fr; gap: 2px; }
  .menu-overlay__nav a { font-size: 19px; }
}

/* 官方细节卡片 */
.dcards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 56px;
}
.dcard2 {
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
  transition: border-color 0.35s, transform 0.35s var(--ease);
}
.dcard2:hover { border-color: rgba(0, 75, 250, 0.55); transform: translateY(-4px); }
.dcard2 img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  filter: saturate(0.78);
  transition: transform 0.8s var(--ease2), filter 0.8s;
}
.dcard2:hover img { transform: scale(1.05); filter: saturate(1.02); }
.dcard2 h3 {
  font-family: var(--display);
  font-weight: 400;
  font-size: 19px;
  letter-spacing: 0.08em;
  margin: 20px 20px 8px;
  line-height: 1.35;
}
.dcard2 h3 span {
  display: block;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--blue);
  margin-top: 4px;
  font-weight: 400;
}
.dcard2 p { color: var(--dim); font-size: 14.5px; line-height: 1.85; margin: 0 20px 22px; }
@media (max-width: 1080px) { .dcards { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .dcards { grid-template-columns: 1fr; } }

/* 锚点偏移（固定导航遮挡） */
section[id] { scroll-margin-top: 72px; }

/* ============================================================
   v8 · 背景视频区（视频 + 叠加文字，官网风格）
   ============================================================ */
.vsection {
  position: relative;
  height: clamp(420px, 64vh, 660px);
  overflow: hidden;
  margin: 72px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.vsection__video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.88) contrast(1.04);
  transform: scale(1.04);
  transition: transform 1.8s var(--ease2);
}
.vsection.is-in .vsection__video { transform: scale(1); }
.vsection__veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to top, rgba(5, 5, 7, 0.92) 0%, rgba(5, 5, 7, 0.35) 38%, rgba(5, 5, 7, 0.18) 70%, rgba(5, 5, 7, 0.45) 100%),
    linear-gradient(to right, rgba(5, 5, 7, 0.55), transparent 55%);
}
.vsection__content {
  position: absolute;
  left: max(24px, calc((100vw - 1280px) / 2 + 24px));
  bottom: 56px;
  max-width: 640px;
  z-index: 2;
}
.vsection__kicker {
  font-size: 11px;
  letter-spacing: 0.32em;
  color: #6f9dff;
  margin-bottom: 14px;
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.8s var(--ease2) 0.15s, transform 0.8s var(--ease2) 0.15s;
}
.vsection__title {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(30px, 4.6vw, 56px);
  line-height: 1.12;
  color: #fff;
  margin-bottom: 16px;
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.9s var(--ease2) 0.3s, transform 0.9s var(--ease2) 0.3s;
}
.vsection__text {
  color: var(--dim);
  font-size: 15.5px;
  line-height: 1.9;
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.9s var(--ease2) 0.45s, transform 0.9s var(--ease2) 0.45s;
}
.vsection.is-in .vsection__kicker,
.vsection.is-in .vsection__title,
.vsection.is-in .vsection__text { opacity: 1; transform: none; }
@media (max-width: 720px) {
  .vsection { height: clamp(380px, 58vh, 520px); }
  .vsection__content { bottom: 36px; }
}

/* ---------- 加速大数字（官网风格） ---------- */
.accel {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin: 8px 0 12px;
}
.accel__item {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--panel), rgba(18, 20, 28, 0.5));
  padding: 28px 22px;
  text-align: center;
  transition: border-color 0.35s, transform 0.35s var(--ease);
}
.accel__item:hover { border-color: var(--blue); transform: translateY(-4px); }
.accel__item b {
  display: block;
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(34px, 4.4vw, 56px);
  color: #fff;
  line-height: 1.1;
  margin-bottom: 8px;
}
.accel__item span { font-size: 12.5px; letter-spacing: 0.18em; color: var(--dim); }
@media (max-width: 900px) { .accel { grid-template-columns: repeat(2, 1fr); } }

/* ---------- 顶部导航：当前章节 + 进度条 ---------- */
.nav__now {
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--dim);
  padding: 8px 14px;
  border: 1px solid var(--line2);
  background: rgba(10, 11, 15, 0.6);
  border-radius: 0;
  transition: color 0.3s, border-color 0.3s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.nav__now::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 8px rgba(0, 75, 250, 0.8);
}
.nav__now b { color: #fff; font-weight: 400; }
.nav__progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: transparent;
}
.nav__progress i {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--blue), #3f7bff);
  box-shadow: 0 0 10px rgba(0, 75, 250, 0.6);
  transition: width 0.2s linear;
}
@media (max-width: 720px) {
  .nav__now { display: none; }
}

/* ---------- 章节标题下划线动画 ---------- */
.sec-title { position: relative; padding-bottom: 18px; }
.sec-title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--blue), transparent);
  transition: width 1.2s var(--ease2) 0.3s;
}
.sec-title.is-in::after { width: 120px; }

/* ============================================================
   v9 · 官网细节视频卡（.webcard）
   ============================================================ */
.webcards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 56px;
}
.webcard {
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
  transition: border-color 0.35s, transform 0.35s var(--ease);
}
.webcard:hover { border-color: rgba(0, 75, 250, 0.55); transform: translateY(-4px); }
.webcard__video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.85);
  transition: filter 0.6s;
}
.webcard:hover .webcard__video { filter: saturate(1.05); }
.webcard__body { padding: 18px 20px 20px; }
.webcard__body h3 {
  font-family: var(--display);
  font-weight: 400;
  font-size: 16px;
  letter-spacing: 0.1em;
  color: #fff;
  margin-bottom: 8px;
}
.webcard__body h3 span {
  display: block;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--blue);
  margin-top: 3px;
  font-weight: 400;
}
.webcard__body p { color: var(--dim); font-size: 14px; line-height: 1.8; }
@media (max-width: 1080px) { .webcards { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .webcards { grid-template-columns: 1fr; } }

/* ============================================================
   v10 · 差异化卡片布局 / 水印 / stagger / hero 逐字
   ============================================================ */
/* 细节视频卡：3 列错落布局 */
.webcards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-flow: dense;
  gap: 18px;
  margin-top: 56px;
  align-items: stretch;
}
.webcard {
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
  position: relative;
  transition: border-color 0.35s, transform 0.35s var(--ease);
}
.webcard:hover { border-color: rgba(0, 75, 250, 0.6); transform: translateY(-4px); }
.webcard--wide { grid-column: span 2; }
.webcard--tall { grid-row: span 2; }
.webcard__video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.85);
  transition: filter 0.6s, transform 0.9s var(--ease2);
}
.webcard--tall .webcard__video { aspect-ratio: 4 / 4.6; }
.webcard:hover .webcard__video { filter: saturate(1.08); transform: scale(1.05); }
.webcard__body { padding: 18px 20px 22px; position: relative; }
.webcard__num {
  position: absolute;
  top: -30px;
  right: 14px;
  font-size: 34px;
  color: rgba(255, 255, 255, 0.16);
  transition: color 0.35s;
  pointer-events: none;
}
.webcard:hover .webcard__num { color: var(--blue); }
.webcard__body h3 {
  font-family: var(--display);
  font-weight: 400;
  font-size: 17px;
  letter-spacing: 0.1em;
  color: #fff;
  margin-bottom: 8px;
  position: relative;
  padding-bottom: 8px;
}
.webcard__body h3::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--blue);
  transition: width 0.5s var(--ease2);
}
.webcard:hover .webcard__body h3::after { width: 44px; }
.webcard__body h3 span {
  display: block;
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--blue);
  margin-top: 3px;
  font-weight: 400;
}
.webcard__body p { color: var(--dim); font-size: 14px; line-height: 1.8; }
@media (max-width: 1080px) { .webcards { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) {
  .webcards { grid-template-columns: 1fr; }
  .webcard--wide { grid-column: span 1; }
  .webcard--tall { grid-row: span 1; }
}

/* 章节编号水印 */
.section { overflow: hidden; }
.section::before {
  content: attr(data-num);
  position: absolute;
  right: 2vw;
  top: 30px;
  font-family: var(--display);
  font-size: clamp(90px, 13vw, 190px);
  line-height: 1;
  color: rgba(255, 255, 255, 0.028);
  pointer-events: none;
  z-index: 0;
}
.section > .wrap, .section > .sec-tag, .section > .sec-title { position: relative; z-index: 1; }
.section .hscroll { position: relative; z-index: 1; }

/* reveal stagger（相邻元素依次延迟） */
.design__grid .dcard:nth-child(2), .ptcard:nth-child(2), .modecard:nth-child(2) { transition-delay: 0.1s; }
.design__grid .dcard:nth-child(3), .ptcard:nth-child(3), .modecard:nth-child(3) { transition-delay: 0.2s; }
.design__grid .dcard:nth-child(4), .modecard:nth-child(4) { transition-delay: 0.3s; }
.webcard:nth-child(2), .tour__card:nth-child(2), .interior__gallery img:nth-child(2) { transition-delay: 0.08s; }
.webcard:nth-child(3), .tour__card:nth-child(3), .interior__gallery img:nth-child(3) { transition-delay: 0.16s; }
.webcard:nth-child(4), .tour__card:nth-child(4) { transition-delay: 0.08s; }
.webcard:nth-child(5), .tour__card:nth-child(5) { transition-delay: 0.16s; }
.webcard:nth-child(6), .tour__card:nth-child(6) { transition-delay: 0.24s; }
.webcard:nth-child(7), .tour__card:nth-child(7) { transition-delay: 0.08s; }
.webcard:nth-child(8), .tour__card:nth-child(8) { transition-delay: 0.16s; }
.webcard:nth-child(9) { transition-delay: 0.08s; }

/* hero 标题逐字 */
.hero__title span {
  display: inline-block;
  opacity: 0;
  transform: translateY(0.4em);
  animation: heroLetter 0.7s var(--ease2) forwards;
  animation-delay: var(--d, 0.3s);
}
@keyframes heroLetter {
  from { opacity: 0; transform: translateY(0.4em); }
  to { opacity: 1; transform: none; }
}

/* ============================================================
   v11 · 图文穿插 / 内嵌视频卡 / 原生横滚 / 卡片光效
   ============================================================ */
/* 图文穿插行 */
.media-row {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
  margin: 44px 0;
}
.media-row--rev .media-row__img { order: 2; }
.media-row__img {
  overflow: hidden;
  border: 1px solid var(--line);
  position: relative;
}
.media-row__img img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  filter: saturate(0.82);
  transition: transform 0.9s var(--ease2), filter 0.6s;
}
.media-row__img:hover img { transform: scale(1.04); filter: saturate(1.05); }
.media-row__text h3 {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(22px, 2.6vw, 30px);
  color: #fff;
  margin-bottom: 14px;
  letter-spacing: 0.04em;
  position: relative;
  padding-bottom: 12px;
}
.media-row__text h3::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 46px;
  height: 2px;
  background: var(--blue);
}
.media-row__text p {
  color: var(--dim);
  font-size: 16px;
  line-height: 2;
}
@media (max-width: 900px) {
  .media-row { grid-template-columns: 1fr; }
  .media-row--rev .media-row__img { order: 0; }
}

/* 章节内嵌视频卡（2 列） */
.webcards--inline { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 720px) { .webcards--inline { grid-template-columns: 1fr; } }
/* 概念名改为标签样式 */
.webcard__num {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.26em;
  color: #6f9dff;
  margin-bottom: 10px;
  position: static;
  transition: none;
}
.webcard:hover .webcard__num { color: #9db9ff; }
.webcard__body h3 {
  font-size: 21px;
  letter-spacing: 0.14em;
}
.webcard__body h3::after { bottom: -1px; }

/* 原生横向滚动（开发测试时间线） */
.hscroll {
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  scrollbar-color: var(--blue) rgba(255, 255, 255, 0.08);
  -webkit-overflow-scrolling: touch;
}
.hscroll::-webkit-scrollbar { height: 6px; }
.hscroll::-webkit-scrollbar-track { background: rgba(255, 255, 255, 0.06); }
.hscroll::-webkit-scrollbar-thumb { background: var(--blue); border-radius: 3px; }
.hscroll__track { scroll-snap-type: none; }
.tcard { scroll-snap-align: start; }

/* 图片容器全部预留固定比例占位，杜绝加载/悬停引发的布局变化 */
.dcard img, .tcard img, .webcard__video, .media-row__img img, .tl-body img,
.interior__gallery img, .bespoke__img img, .china__img img, .manu__img img,
.community__pics img, .tour__card img, .design__hero img, .pt__main img,
.interior__hero img, .aero__img img, .perf__img img {
  aspect-ratio: attr(width) / attr(height);
}
.hcard:hover, .dcard:hover, .ptcard:hover, .modecard:hover, .tcard:hover,
.webcard:hover, .bstat:hover, .accel__item:hover {
  box-shadow: 0 0 0 1px rgba(0, 75, 250, 0.45), 0 22px 48px -22px rgba(0, 75, 250, 0.4);
}
.dcard img, .tcard img, .webcard__video, .community__pics img, .interior__gallery img {
  transition: filter 0.6s, transform 0.9s var(--ease2), box-shadow 0.45s;
}

/* ============================================================
   v12 · 章节分隔提示 / 测试网格 / 标题分级修正
   ============================================================ */
/* 章节分隔提示页 */
.chapter-break {
  padding: 96px 0 40px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 56px;
  position: relative;
}
.chapter-break .wrap { display: flex; align-items: baseline; gap: 22px; flex-wrap: wrap; }
.cb__no {
  font-family: var(--display);
  font-size: clamp(64px, 9vw, 120px);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 255, 255, 0.35);
  letter-spacing: 0.02em;
  opacity: 0;
  transform: translateX(-24px);
  transition: opacity 0.9s var(--ease2), transform 0.9s var(--ease2);
}
.cb__name {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(30px, 4.4vw, 52px);
  color: #fff;
  letter-spacing: 0.1em;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.9s var(--ease2) 0.12s, transform 0.9s var(--ease2) 0.12s;
}
.cb__meta {
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--faint);
  margin-left: auto;
  opacity: 0;
  transition: opacity 0.9s var(--ease2) 0.24s;
}
.chapter-break::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 1px;
  width: 0;
  background: var(--blue);
  transition: width 1.2s var(--ease2) 0.2s;
}
.chapter-break.is-in::after { width: 180px; }
.chapter-break.is-in .cb__no, .chapter-break.is-in .cb__name, .chapter-break.is-in .cb__meta { opacity: 1; transform: none; }

/* 测试卡片：3 列网格 */
.tgrid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 48px;
}
.tcard { width: auto; min-width: 0; }
.tcard--wide { grid-column: span 2; }
.tcard--wide img { aspect-ratio: 21 / 9; }
@media (max-width: 1080px) { .tgrid { grid-template-columns: 1fr; } .tcard--wide { grid-column: span 1; } }

/* 巡展卡片：2 列，杜绝溢出 */
.tour__grid {
  grid-template-columns: repeat(2, 1fr);
  padding: 0;
  margin-top: 48px;
}
.tour__card { min-width: 0; }
@media (max-width: 720px) { .tour__grid { grid-template-columns: 1fr; } }

/* 设计卡片：2 列大图 */
.design__grid { grid-template-columns: repeat(2, 1fr); gap: 22px; }
.dcard__body { padding: 22px 24px 26px; }
.dcard__body h3 {
  font-family: var(--display);
  font-weight: 400;
  font-size: 22px;
  letter-spacing: 0.06em;
  margin: 0 0 10px;
  position: relative;
  padding-bottom: 10px;
  color: #fff;
}
.dcard__body h3::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--blue);
  transition: width 0.5s var(--ease2);
}
.dcard:hover .dcard__body h3::after { width: 40px; }
.dcard__body p { color: var(--dim); font-size: 15px; margin: 0; }
.dcard img { aspect-ratio: 16 / 9; }
@media (max-width: 900px) { .design__grid { grid-template-columns: 1fr; } }

/* 空气动力学小标题：不小于正文 */
.aero__list h3 {
  font-family: var(--display);
  font-weight: 400;
  font-size: 24px;
  letter-spacing: 0.04em;
  color: #fff;
  margin-bottom: 10px;
  position: relative;
  padding-bottom: 10px;
}
.aero__list h3::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 34px;
  height: 2px;
  background: var(--blue);
}

/* 章节内 h2 不再需要 sec-tag 上方空格（分隔页已提供） */
.section > .wrap { position: relative; z-index: 1; }

/* ============================================================
   v13 · 章节分隔页强化 / 模式卡等高 / 标题层级修正
   ============================================================ */
/* 章节分隔页：极简排版 */
.chapter-break {
  padding: 72px 0 28px;
  margin-bottom: 40px;
  border: none;
  background: none;
}
.chapter-break::before { content: none; }
.chapter-break .wrap { display: flex; align-items: baseline; gap: 24px; flex-wrap: wrap; padding-top: 0; }
.cb__no {
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: 0.3em;
  color: var(--faint);
  -webkit-text-stroke: 0;
  text-shadow: none;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.8s var(--ease2) 0.1s, transform 0.8s var(--ease2) 0.1s;
}
.cb__name {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(40px, 5.6vw, 68px);
  letter-spacing: 0.08em;
  color: #fff;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.9s var(--ease2) 0.18s, transform 0.9s var(--ease2) 0.18s;
}
.cb__meta {
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--faint);
  margin-left: auto;
  opacity: 0;
  transition: opacity 0.8s var(--ease2) 0.3s;
}
.chapter-break::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  height: 1px;
  width: 0;
  background: linear-gradient(90deg, var(--blue), rgba(0, 75, 250, 0.15), transparent);
  transition: width 1.1s var(--ease2) 0.25s;
}
.chapter-break.is-in::after { width: 100%; }
.chapter-break.is-in .cb__no, .chapter-break.is-in .cb__name, .chapter-break.is-in .cb__meta { opacity: 1; transform: none; }

/* 驾驶模式卡等高 */
.modes { align-items: stretch; }
.modecard { display: flex; flex-direction: column; height: 100%; }
.modecard p:last-child { flex: 1; }

/* 标题层级统一（颜色/大小） */
.sec-title { color: #fff; }
.media-row__text h3, .aero__list h3, .modes__head, .webcard__body h3 { color: #fff; }
.cb__name { color: #fff; }

/* ============================================================
   v14 · 纵向时间线 / 总结章节
   ============================================================ */
/* 开发时间线 */
.timeline {
  position: relative;
  margin: 56px 0 20px;
  padding-left: 0;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--blue), rgba(0, 75, 250, 0.12));
}
.tl-item {
  position: relative;
  padding: 0 0 44px 52px;
}
.tl-item::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 10px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--blue);
  box-shadow: 0 0 12px rgba(0, 75, 250, 0.6);
}
.tl-date {
  font-size: 12px;
  letter-spacing: 0.28em;
  color: #6f9dff;
  margin-bottom: 10px;
}
.tl-body {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 24px;
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
  transition: border-color 0.35s, transform 0.35s var(--ease);
}
.tl-body:hover { border-color: rgba(0, 75, 250, 0.5); transform: translateX(6px); }
.tl-body img {
  width: 100%;
  height: 100%;
  min-height: 200px;
  object-fit: cover;
  filter: saturate(0.8);
  transition: transform 0.9s var(--ease2), filter 0.6s;
}
.tl-body:hover img { transform: scale(1.04); filter: saturate(1.05); }
.tl-text { padding: 26px 28px; display: flex; flex-direction: column; justify-content: center; }
.tl-text h3 {
  font-family: var(--display);
  font-weight: 400;
  font-size: 24px;
  color: #fff;
  margin-bottom: 12px;
  letter-spacing: 0.06em;
}
.tl-text p { color: var(--dim); font-size: 15px; line-height: 1.95; }
@media (max-width: 900px) {
  .tl-body { grid-template-columns: 1fr; }
  .tl-body img { min-height: 160px; }
}

/* 总结章节 */
.conclusion { text-align: center; }
.conclusion__inner { max-width: 860px; margin: 0 auto; padding: 40px 0 20px; }
.conclusion__en {
  font-size: 13px;
  letter-spacing: 0.5em;
  color: #6f9dff;
  margin-bottom: 18px;
}
.conclusion__title {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(44px, 7vw, 88px);
  color: #fff;
  letter-spacing: 0.1em;
  margin-bottom: 26px;
  position: relative;
  display: inline-block;
  padding-bottom: 20px;
}
.conclusion__title::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 90px;
  height: 2px;
  background: var(--blue);
}
.conclusion__lead {
  color: var(--dim);
  font-size: 17px;
  line-height: 2;
  margin-bottom: 44px;
}
.conclusion .quote { margin: 0 auto 48px; text-align: left; }
.conclusion__links { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.conclusion__btn {
  padding: 15px 34px;
  border: 1px solid var(--blue);
  background: var(--blue);
  color: #fff;
  font-size: 13px;
  letter-spacing: 0.24em;
  transition: background 0.3s, box-shadow 0.3s, transform 0.3s;
}
.conclusion__btn:hover { background: #0a5aff; box-shadow: 0 0 24px rgba(0, 75, 250, 0.5); transform: translateY(-2px); }
.conclusion__btn--ghost { background: transparent; color: var(--txt); }
.conclusion__btn--ghost:hover { background: var(--blue-soft); color: #fff; }


/* ============================================================
   v15 · 空气条目编号 / 卡片点击放大
   ============================================================ */
.aero__list { margin: 16px 0 56px; }
.aero__list article {
  position: relative;
  padding: 26px 0 26px 64px;
  border-bottom: 1px solid var(--line);
}
.aero__no {
  position: absolute;
  left: 0;
  top: 26px;
  font-size: 13px;
  color: var(--blue);
  letter-spacing: 0.1em;
}
.aero__list h3 {
  font-family: var(--display);
  font-weight: 400;
  font-size: 24px;
  letter-spacing: 0.04em;
  color: #fff;
  margin-bottom: 10px;
}
.aero__list p { color: var(--dim); font-size: 15.5px; line-height: 1.95; max-width: 720px; }

/* 卡片点击放大强化（原地动画，不跳转） */
@keyframes cardTap {
  0% { transform: scale(1); }
  35% { transform: scale(0.97); }
  70% { transform: scale(1.03); }
  100% { transform: scale(1); }
}
.hcard, .dcard, .ptcard, .modecard, .tcard, .webcard, .bstat, .accel__item, .tl-body, .compare {
  cursor: pointer;
}
.is-tapped {
  animation: cardTap 0.45s var(--ease);
}

/* ============================================================
   v16 · 章节分隔页突出 / 标题层级 / 交互微调
   ============================================================ */
/* 章节分隔页：突出但克制（左侧蓝条 + 微弱渐变 + 大标题） */
.chapter-break {
  padding: 84px 0 32px;
  margin-bottom: 44px;
  border: none;
  background: linear-gradient(90deg, rgba(0, 75, 250, 0.09), transparent 62%);
  border-left: 4px solid var(--blue);
  padding-left: 0;
}
.chapter-break::before { content: none; }
.chapter-break .wrap { display: flex; align-items: baseline; gap: 26px; flex-wrap: wrap; padding-top: 0; }
.cb__no {
  font-family: var(--mono);
  font-size: 19px;
  letter-spacing: 0.24em;
  color: #6f9dff;
  -webkit-text-stroke: 0;
  text-shadow: none;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.8s var(--ease2) 0.08s, transform 0.8s var(--ease2) 0.08s;
}
.cb__name {
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(56px, 8vw, 96px);
  line-height: 1;
  letter-spacing: 0.06em;
  color: #fff;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.9s var(--ease2) 0.16s, transform 0.9s var(--ease2) 0.16s;
}
.cb__meta {
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--faint);
  margin-left: auto;
  opacity: 0;
  transition: opacity 0.8s var(--ease2) 0.28s;
}
.chapter-break::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--blue), rgba(0, 75, 250, 0.2), transparent);
  transition: width 1.1s var(--ease2) 0.2s;
}
.chapter-break.is-in::after { width: 100%; }
.chapter-break.is-in .cb__no, .chapter-break.is-in .cb__name, .chapter-break.is-in .cb__meta { opacity: 1; transform: none; }

/* 标题层级：章节名 > 主题句 > 小节 */
.sec-title { font-size: clamp(32px, 4.6vw, 58px); }

/* aero 小标题下划线加长 */
.aero__list h3::after {
  width: 64px;
  height: 2px;
}

/* 卡片点击动画：柔和脉冲 */
@keyframes cardTap {
  0% { transform: scale(1); }
  40% { transform: scale(1.02); }
  100% { transform: scale(1); }
}
.hcard, .dcard, .ptcard, .modecard, .tcard, .webcard, .bstat, .accel__item, .tl-body, .compare { cursor: pointer; }
.is-tapped { animation: cardTap 0.3s var(--ease); }

/* ============================================================
   v17 · 章节面板强化 / 间距紧凑 / 点击动画去跳变
   ============================================================ */
/* 章节分隔页：整块面板 + 超大编号水印 */
.chapter-break {
  position: relative;
  padding: 68px 0 34px;
  margin-bottom: 38px;
  border: 1px solid var(--line);
  border-left: 5px solid var(--blue);
  background: linear-gradient(115deg, rgba(0, 75, 250, 0.15) 0%, rgba(18, 20, 28, 0.92) 52%);
  overflow: hidden;
}
.chapter-break::before {
  content: attr(data-ch);
  position: absolute;
  right: 2vw;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--display);
  font-size: clamp(120px, 17vw, 230px);
  line-height: 1;
  color: rgba(255, 255, 255, 0.05);
  pointer-events: none;
  user-select: none;
}
.chapter-break::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--blue), rgba(0, 75, 250, 0.25), transparent);
  transition: width 1.1s var(--ease2) 0.2s;
}
.chapter-break.is-in::after { width: 100%; }
.cb__no {
  font-size: 20px;
  letter-spacing: 0.28em;
  color: #6f9dff;
}
.cb__name {
  font-size: clamp(58px, 8vw, 100px);
  letter-spacing: 0.05em;
}
.cb__meta { color: var(--dim); }

/* 间距紧凑化 */
.section { padding: 96px 0; }
.story__lead { margin-bottom: 40px; }
.two-col { margin: 38px 0; }
.media-row { margin: 36px 0; }
.sec-lead { margin-bottom: 42px; }
.detail-list { margin: 44px 0; }
.webcards { margin-top: 44px; }
.gauges { margin: 48px 0 24px; }
.pt__three { margin-bottom: 48px; }
.interior__hero { margin: 40px 0 48px; }
.modes__head { margin: 42px 0 22px; }
.timeline { margin: 44px 0 16px; }
.tl-item { padding-bottom: 36px; }
.aero__list { margin: 12px 0 44px; }
.conclusion__inner { padding: 30px 0 10px; }
.compare { margin-bottom: 38px; }
.bespoke__grid { margin-bottom: 38px; }
.manu__img { margin: 40px 0 44px; }
.manu__stats { margin-bottom: 36px; }
.community__pics { margin-top: 44px; }
.hscroll { margin-top: 44px; }

/* 点击动画：仅亮度脉冲，不触碰 transform/布局 */
@keyframes cardTap {
  0% { filter: brightness(1); }
  40% { filter: brightness(1.25); }
  100% { filter: brightness(1); }
}
.hcard, .dcard, .ptcard, .modecard, .tcard, .webcard, .bstat, .accel__item, .tl-body, .compare { cursor: pointer; }
.is-tapped { animation: cardTap 0.35s var(--ease); }

/* 索引栏进度线高度由 JS 以 CSS 变量驱动 */
.index-rail::after { height: var(--rail-h, 0%); }

/* ============================================================
   v21 · 透明层可点击根因修复
   ============================================================ */
/* 根治：hidden 属性优先级被 CSS display 覆盖的问题 */
[hidden] { display: none !important; }

/* 索引栏：未激活（透明收起）时完全不可点击 */
.index-rail { pointer-events: none; }
.index-rail.is-on { pointer-events: auto; }

/* 滚动进度表盘：未显示时不可点击 */
.scroll-gauge:not(.is-on) { pointer-events: none; }

/* 菜单层：打开时正常交互；关闭由 [hidden] 规则强制隐藏 */
.menu-overlay { pointer-events: auto; }

/* ============================================================
   v22 · 导航三栏布局 / 汉堡图标 / 点击波纹 / 卡片特效
   ============================================================ */
/* 顶部导航：左=章节进度，中=品牌，右=菜单 */
.nav__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
}
.nav__now { justify-self: start; }
.nav__brand {
  justify-self: center;
  transition: opacity 0.6s var(--ease2);
}
.nav__brand.is-hidden {
  opacity: 0;
  pointer-events: none;
}
.nav__menu-btn { justify-self: end; }

/* 汉堡图标：三线，展开变 X */
.nav__menu-icon { position: relative; width: 20px; height: 14px; }
.nav__menu-icon i {
  position: absolute;
  left: 0;
  width: 20px;
  height: 1.5px;
  background: currentColor;
  border-radius: 1px;
  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: 6.25px; }
.nav__menu-icon i:last-child { bottom: 0; }
.nav__menu-btn[aria-expanded="true"] i:first-child { transform: translateY(6.25px) 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(-6.25px) rotate(-45deg); }

/* 点击波纹（全站，纯特效不跳转） */
.ripple {
  position: fixed;
  width: 14px;
  height: 14px;
  margin: -7px 0 0 -7px;
  border-radius: 50%;
  border: 2px solid rgba(0, 75, 250, 0.75);
  pointer-events: none;
  z-index: 9997;
  animation: rippleAnim 0.7s var(--ease2) forwards;
}
@keyframes rippleAnim {
  0% { transform: scale(0); opacity: 0.9; }
  100% { transform: scale(7); opacity: 0; }
}

/* 卡片点击：放大 + 蓝色辉光 + 变色 */
@keyframes cardTap {
  0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(0, 75, 250, 0); filter: brightness(1); }
  35% { transform: scale(1.02); box-shadow: 0 0 0 1px rgba(0, 75, 250, 0.65), 0 0 34px rgba(0, 75, 250, 0.4); filter: brightness(1.15); }
  100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(0, 75, 250, 0); filter: brightness(1); }
}
.hcard, .dcard, .ptcard, .modecard, .tcard, .webcard, .bstat, .accel__item, .tl-body, .compare { cursor: pointer; }
.is-tapped { animation: cardTap 0.45s var(--ease); }

/* 设计卡片：鼠标高光跟随 */
.dcard { position: relative; overflow: hidden; }
.dcard::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(340px circle at var(--mx, 50%) var(--my, 50%), rgba(0, 75, 250, 0.16), transparent 62%);
  opacity: 0;
  transition: opacity 0.35s;
  pointer-events: none;
  z-index: 1;
}
.dcard:hover::after { opacity: 1; }
.dcard__body, .dcard h3 { position: relative; z-index: 2; }

/* ============================================================
   v24 · 呈现优化：金属点缀 / 章节导语 / 数据带 / 交互增强
   ============================================================ */
:root { --metal: #c9ccd3; }

/* 章节编号改为钛银金属色 */
.cb__no { color: var(--metal); }

/* 章节导语 */
.cb__lead {
  flex-basis: 100%;
  font-size: 14.5px;
  color: var(--dim);
  letter-spacing: 0.06em;
  margin-top: 6px;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.8s var(--ease2) 0.36s, transform 0.8s var(--ease2) 0.36s;
}
.chapter-break.is-in .cb__lead { opacity: 1; transform: none; }

/* 超大数字带 */
.bigstats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 44px 0;
}
.bigstats__item {
  border: 1px solid var(--line);
  border-top: 2px solid var(--blue);
  background: var(--panel);
  padding: 24px 18px;
  text-align: center;
  transition: border-color 0.35s, transform 0.35s var(--ease), box-shadow 0.45s;
  cursor: pointer;
}
.bigstats__item:hover {
  border-color: rgba(0, 75, 250, 0.55);
  transform: translateY(-4px);
  box-shadow: 0 0 0 1px rgba(0, 75, 250, 0.45), 0 22px 48px -22px rgba(0, 75, 250, 0.4);
}
.bigstats__item b {
  display: block;
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(30px, 3.6vw, 46px);
  color: #fff;
  line-height: 1.1;
  margin-bottom: 8px;
}
.bigstats__item span { font-size: 12px; letter-spacing: 0.2em; color: var(--metal); }
@media (max-width: 900px) { .bigstats { grid-template-columns: repeat(2, 1fr); } }

/* 总结收尾数字 */
.final-stats {
  display: flex;
  justify-content: center;
  gap: clamp(28px, 6vw, 80px);
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.final-stats__item { text-align: center; }
.final-stats__item b {
  display: block;
  font-family: var(--display);
  font-weight: 400;
  font-size: clamp(40px, 6vw, 72px);
  color: #fff;
  line-height: 1;
}
.final-stats__item span {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--metal);
}

/* Hero：蓝色生长线 + 数字下划线 */
.hero__content { position: relative; }
.hero__content::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 8px;
  height: 2px;
  width: var(--line-w, 0%);
  background: linear-gradient(90deg, var(--blue), transparent);
  transition: width 0.25s ease;
}
.hero__specs span { position: relative; padding-bottom: 6px; }
.hero__specs span::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  height: 1px;
  width: 0;
  background: var(--blue);
  transition: width 1.4s var(--ease2) 1s;
}
.hero.is-inview .hero__specs span::after { width: 100%; }

/* 章节背景层次（极淡交替） */
#story, #interior, #performance, #testing, #bespoke {
  background: linear-gradient(180deg, rgba(10, 11, 15, 0.5), transparent 34%);
}

/* 规格表 hover：数值变蓝 */
.spec-table__row:hover b { color: #6f9dff; transition: color 0.3s; }

/* 时间线 hover：日期放大 + 节点光点 */
.tl-item:hover .tl-date { transform: scale(1.12); color: #fff; transform-origin: left; transition: transform 0.3s, color 0.3s; }
.tl-item:hover::before {
  background: var(--blue);
  box-shadow: 0 0 0 6px rgba(0, 75, 250, 0.25), 0 0 22px rgba(0, 75, 250, 0.8);
  transition: box-shadow 0.3s;
}

/* 图片信息浮层（hover 显示标题） */
.dcard, .tour__card, .tcard, .tl-body { position: relative; }
.dcard::before, .tour__card::before, .tcard::before {
  content: attr(data-cap);
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  z-index: 3;
  padding: 40px 20px 16px;
  background: linear-gradient(180deg, rgba(5, 5, 7, 0.85), transparent 85%);
  font-family: var(--display);
  font-size: 17px;
  letter-spacing: 0.06em;
  color: #fff;
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity 0.35s, transform 0.35s;
  pointer-events: none;
}
.dcard:hover::before, .tour__card:hover::before, .tcard:hover::before { opacity: 1; transform: none; }
.tl-body::before {
  content: attr(data-cap);
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  z-index: 3;
  padding: 40px 24px 16px;
  background: linear-gradient(180deg, rgba(5, 5, 7, 0.85), transparent 85%);
  font-family: var(--display);
  font-size: 17px;
  letter-spacing: 0.06em;
  color: #fff;
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity 0.35s, transform 0.35s;
  pointer-events: none;
}
.tl-body:hover::before { opacity: 1; transform: none; }

/* 表盘 hover：数字放大 + 光晕增强 */
.gauge:hover figcaption b { transform: scale(1.07); transition: transform 0.3s; }
.gauge:hover .gauge__bar { filter: drop-shadow(0 0 10px rgba(0, 75, 250, 0.85)); transition: filter 0.3s; }

/* 移动端：大图竖版裁切 */
@media (max-width: 720px) {
  .design__hero img { aspect-ratio: 4 / 5; object-fit: cover; }
  .interior__hero img { aspect-ratio: 4 / 5; object-fit: cover; }
  .pt__main img { aspect-ratio: 1 / 1; object-fit: cover; }
  .manu__img img { aspect-ratio: 4 / 5; object-fit: cover; }
}

/* ============================================================
   v25 · 多尺寸屏幕适配优化
   ============================================================ */
/* 超窄屏（≤600px）：单列/紧凑 */
@media (max-width: 600px) {
  .gauges { grid-template-columns: 1fr; }
  .bigstats { grid-template-columns: 1fr 1fr; }
  .detail-list li { grid-template-columns: 1fr; gap: 4px; padding: 14px 0; }
  .detail-list li b { justify-self: start; }
  .hero__scroll { display: none; }
  .hero__specs b { font-size: 28px; }
  .hero__specs span { font-size: 13px; }
  .hero__desc { font-size: 14.5px; }
  .quote { padding-left: 20px; }
  .quote__en { font-size: 12px; }
  .media-row__text h3 { font-size: 22px; }
  .modes__head { font-size: 19px; }
  .tl-body img { min-height: 130px; }
  .webcard__body h3 { font-size: 18px; }
  .footer__top { flex-direction: column; align-items: flex-start; gap: 14px; }
  .footer__links { flex-wrap: wrap; gap: 16px; }
  .cb__name { font-size: 52px; }
  .cb__lead { font-size: 13.5px; }
  .accel { grid-template-columns: repeat(2, 1fr); }
  .accel__item b { font-size: 30px; }
}

/* 极窄屏（≤400px）：导航精简 */
@media (max-width: 420px) {
  .nav__brand-sub { display: none; }
  .nav__now { font-size: 12px; padding: 6px 10px; }
  .nav__brand svg { width: 64px; }
  .nav__inner { gap: 8px; }
  .vsection { height: clamp(340px, 56vh, 460px); }
  .vsection__text { font-size: 14px; }
  .sec-title { font-size: 30px; }
  .bigstats__item b { font-size: 28px; }
  .final-stats__item b { font-size: 38px; }
}

/* 横屏/矮屏（平板横放、笔记本矮窗口） */
@media (max-height: 640px) and (min-width: 720px) {
  .section { padding: 72px 0; }
  .hero { min-height: 100svh; }
  .vsection { height: 72vh; }
  .chapter-break { padding: 56px 0 24px; margin-bottom: 32px; }
  .gauges { margin: 36px 0 20px; }
}

/* 平板中间态（721–900px）：双栏间距微调 */
@media (min-width: 721px) and (max-width: 900px) {
  .two-col { gap: 30px; }
  .media-row { gap: 30px; }
  .bespoke__grid { gap: 36px; }
}

/* 超宽屏（≥1921px）：标题封顶、内容仍居中 */
@media (min-width: 1921px) {
  .hero__title { font-size: 172px; }
  .gauges { max-width: 1100px; margin-left: auto; margin-right: auto; }
  .accel { max-width: 1100px; margin-left: auto; margin-right: auto; }
}

/* 触屏设备：隐藏桌面端专属组件 */
@media (pointer: coarse) {
  .nav__dots { display: none; }
  .index-rail { display: none; }
  .dcard::after { display: none; }
}

/* iPhone 刘海/底部安全区 */
@supports (padding: env(safe-area-inset-top)) {
  .nav { padding-top: calc(14px + env(safe-area-inset-top)); }
  .hero__content { padding-bottom: calc(88px + env(safe-area-inset-bottom)); }
  .scroll-gauge { bottom: calc(26px + env(safe-area-inset-bottom)); }
  .footer { padding-bottom: calc(40px + env(safe-area-inset-bottom)); }
}

/* 打印友好：隐藏动效与视频 */
@media print {
  .cursor, .glow, .scroll-gauge, .index-rail, .nav, .vsection, .media-block, .webcard__video { display: none !important; }
  body { background: #fff; color: #111; }
  .section { padding: 40px 0; }
  img { max-width: 100%; }
}

/* ============================================================
   v26 · 语言切换按钮
   ============================================================ */
.nav__lang {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: opacity 0.6s var(--ease2);
}
.nav__lang.is-hidden {
  opacity: 0;
  pointer-events: none;
}
.lang-btn {
  padding: 8px 6px;
  border: none;
  background: none;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--dim);
  position: relative;
  transition: color 0.3s;
}
.lang-btn::after {
  content: '';
  position: absolute;
  left: 6px;
  right: 6px;
  bottom: 4px;
  height: 1px;
  background: var(--blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}
.lang-btn:hover {
  color: #fff;
}
.lang-btn:hover::after {
  transform: scaleX(1);
}