/* ============================================================
   FERRARI F80 · 非官方展示站
   设计语言参照 tourbillon.hypercar.site(Bugatti 官方站风格):
   深色精密 · 法拉利红点缀 · 章节分隔页 · 右侧索引 · 进度表盘
   ============================================================ */

@font-face {
  font-family: 'Ferrari Sans';
  src: url('../fonts/Ferrari-SansRegular.woff2') format('woff2');
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: 'Ferrari Sans';
  src: url('../fonts/Ferrari-SansMedium.woff2') format('woff2');
  font-weight: 500;
  font-display: swap;
}
@font-face {
  font-family: 'Noto Sans';
  src: url('../fonts/NotoSans-Regular.woff2') format('woff2');
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: 'Noto Sans';
  src: url('../fonts/NotoSans-Bold.woff2') format('woff2');
  font-weight: 700;
  font-display: swap;
}

:root {
  --bg: #07070b;
  --bg2: #0c0d13;
  --panel: #1a1e28;
  --panel2: #20242f;
  --line: rgba(255, 255, 255, 0.13);
  --line2: rgba(255, 255, 255, 0.24);
  --red: #dc0000;
  --red-soft: rgba(220, 0, 0, 0.14);
  --txt: #f5f5f7;
  --dim: #b6b6c0;
  --faint: #8d8d99;
  --sans: 'Ferrari Sans', 'Noto Sans', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --mono: 'Ferrari Sans', 'Noto Sans', ui-monospace, 'Cascadia Mono', Consolas, 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(--sans);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: var(--red); 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; }

/* ============ 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; } }

/* 光斑(鼠标缓动) */
.glow {
  position: fixed;
  width: 520px; height: 520px;
  margin: -260px 0 0 -260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(220, 0, 0, 0.06) 0%, transparent 65%);
  pointer-events: none;
  z-index: 1;
  opacity: 0;
  transition: opacity 1s;
}
.glow.is-on { opacity: 1; }
@media (pointer: coarse) { .glow { display: none; } }

/* ============ 导航 ============ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 20px 26px;
  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: 12px 26px;
  border-bottom: 1px solid var(--line);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.nav__now {
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--dim);
  transition: opacity 0.4s;
  white-space: nowrap;
}
.nav__now b { color: var(--red); font-weight: 500; margin-right: 4px; }
.nav__brand { display: flex; align-items: baseline; gap: 10px; color: #fff; opacity: 1; transition: opacity 0.4s; }
.nav__brand.is-hidden { opacity: 0; pointer-events: none; }
.nav__brand-mark {
  font-size: 17px;
  font-weight: 500;
  letter-spacing: 0.34em;
}
.nav__brand-mark span { color: var(--red); }
.nav__brand-sub { font-size: 13px; letter-spacing: 0.28em; color: var(--dim); }
.nav__lang { display: flex; align-items: center; gap: 16px; transition: opacity 0.4s; }
.nav__lang.is-hidden { opacity: 0; pointer-events: none; }
.lang-btn {
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--dim);
  transition: color 0.25s;
}
.lang-btn:hover, .lang-btn.is-active { color: var(--red); }
.nav__menu-btn {
  width: 38px; height: 38px;
  border: 1px solid var(--line2);
  border-radius: 50%;
  display: grid;
  place-items: center;
  transition: border-color 0.3s;
}
.nav__menu-btn:hover { border-color: var(--red); }
.nav__menu-icon { display: flex; flex-direction: column; gap: 5px; align-items: center; }
.nav__menu-icon i {
  display: block;
  width: 14px; height: 1.5px;
  background: var(--txt);
  transition: transform 0.35s var(--ease), opacity 0.25s;
}
.nav__menu-btn.is-open .nav__menu-icon i:nth-child(1) { transform: translateY(3.25px) rotate(45deg); }
.nav__menu-btn.is-open .nav__menu-icon i:nth-child(2) { opacity: 0; }
.nav__menu-btn.is-open .nav__menu-icon i:nth-child(3) { transform: translateY(-3.25px) rotate(-45deg); }
.nav__progress {
  position: absolute;
  left: 0; bottom: -1px;
  width: 100%;
  height: 2px;
  background: transparent;
}
.nav__progress i {
  display: block;
  height: 100%;
  width: 0;
  background: var(--red);
}

/* ============ 全屏菜单 ============ */
.menu-overlay {
  position: fixed;
  inset: 0;
  z-index: 90;
  background: rgba(5, 5, 7, 0.97);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s var(--ease), visibility 0.4s;
  overflow-y: auto;
}
.menu-overlay.is-open { opacity: 1; visibility: visible; }
.menu-overlay__nav {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: clamp(6px, 1.4vh, 14px);
  padding: 80px 24px;
}
.menu-overlay__nav a {
  font-size: clamp(20px, 3.4vh, 30px);
  letter-spacing: 0.1em;
  color: var(--dim);
  display: inline-flex;
  align-items: baseline;
  gap: 16px;
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.4s var(--ease2), transform 0.4s var(--ease2), color 0.25s;
}
.menu-overlay.is-open .menu-overlay__nav a { opacity: 1; transform: none; }
.menu-overlay__nav a:hover, .menu-overlay__nav a.is-active { color: #fff; }
.menu-overlay__nav a .idx {
  font-size: 0.4em;
  color: var(--red);
  letter-spacing: 0.2em;
}

/* ============ 右侧章节索引 ============ */
.index-rail {
  position: fixed;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 80;
  width: 30px;
  background: rgba(10, 10, 14, 0.75);
  backdrop-filter: blur(10px);
  border-left: 1px solid var(--line);
  opacity: 0;
  transition: opacity 0.5s, width 0.4s var(--ease);
  overflow: hidden;
}
.index-rail.is-on { opacity: 1; }
.index-rail:hover { width: 190px; }
.index-rail__title {
  padding: 14px 0 4px;
  text-align: center;
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--faint);
  white-space: nowrap;
}
.index-rail__nav { display: flex; flex-direction: column; padding: 4px 0; }
.index-rail__nav a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 7px 12px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--dim);
  white-space: nowrap;
  position: relative;
  transition: color 0.3s, background 0.3s;
}
.index-rail__nav a .idx {
  font-size: 11px;
  color: var(--faint);
  min-width: 20px;
  text-align: right;
}
.index-rail__nav a:hover { color: var(--txt); background: rgba(255, 255, 255, 0.04); }
.index-rail__nav a.is-active { color: var(--red); }
.index-rail__nav a.is-active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--red);
}
.index-rail__progress {
  padding: 4px 0 14px;
  text-align: center;
  font-size: 11px;
  color: var(--faint);
  letter-spacing: 0.2em;
  white-space: nowrap;
}

/* ============ 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(--red);
  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(0.9) contrast(1.05) brightness(1.12);
}
.hero__veil {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 90% at 50% 110%, rgba(5, 5, 7, 0.92) 0%, rgba(5, 5, 7, 0.5) 45%, rgba(5, 5, 7, 0.12) 75%, rgba(5, 5, 7, 0.35) 100%),
    linear-gradient(to top, var(--bg) 0%, rgba(5, 5, 7, 0.25) 18%, transparent 42%);
}
.hero__content {
  position: relative;
  z-index: 2;
  width: min(1280px, calc(100% - 48px));
  margin: 0 auto;
  padding-bottom: 84px;
}
.hero__kicker {
  font-size: 12px;
  letter-spacing: 0.42em;
  color: var(--red);
  margin-bottom: 18px;
  opacity: 0;
  animation: heroIn 1s var(--ease2) 0.2s forwards;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.7);
}
.hero__title {
  font-weight: 400;
  font-size: clamp(52px, 9vw, 128px);
  line-height: 0.98;
  letter-spacing: 0.04em;
  color: #fff;
  opacity: 0;
  animation: heroIn 1.1s var(--ease2) 0.35s forwards;
  text-shadow: 0 3px 34px rgba(0, 0, 0, 0.65), 0 0 80px rgba(0, 0, 0, 0.45);
}
.hero__title span { display: inline-block; transform: translateY(110%); animation: lineUp 1.1s var(--ease2) forwards; animation-delay: var(--d, 0.35s); }
@keyframes lineUp { to { transform: translateY(0); } }
.hero__sub {
  font-size: clamp(15px, 1.8vw, 22px);
  letter-spacing: 0.3em;
  color: var(--red);
  margin-top: 16px;
  opacity: 0;
  animation: heroIn 1.1s var(--ease2) 0.55s forwards;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.8);
}
.hero__desc {
  margin-top: 24px;
  color: #d9d9de;
  font-size: 15.5px;
  max-width: 540px;
  line-height: 1.9;
  opacity: 0;
  animation: heroIn 1.1s var(--ease2) 0.7s forwards;
  text-shadow: 0 2px 14px rgba(0, 0, 0, 0.8);
}
.hero__specs {
  margin-top: 30px;
  display: flex;
  gap: clamp(26px, 4vw, 48px);
  opacity: 0;
  animation: heroIn 1.1s var(--ease2) 0.85s forwards;
}
.hero__specs span { color: var(--dim); font-size: 14px; letter-spacing: 0.14em; text-shadow: 0 2px 12px rgba(0, 0, 0, 0.8); }
.hero__specs b { font-size: clamp(26px, 3vw, 38px); font-weight: 400; color: #fff; margin-right: 4px; text-shadow: 0 2px 16px rgba(0, 0, 0, 0.8); }
@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(--red);
  animation: lineFall 2.2s var(--ease) infinite;
}
@keyframes lineFall { 0% { top: -100%; } 60%, 100% { top: 100%; } }

/* ============ 章节分隔页 ============ */
.chapter-break {
  position: relative;
  padding: 72px 0 64px;
  background:
    radial-gradient(42% 160% at 8% 50%, rgba(220, 0, 0, 0.24) 0%, transparent 60%),
    radial-gradient(50% 140% at 92% 50%, rgba(220, 0, 0, 0.16) 0%, transparent 64%),
    linear-gradient(180deg, #0d0e15 0%, #07080b 100%),
    repeating-linear-gradient(45deg, rgba(255, 255, 255, 0.012) 0 2px, transparent 2px 16px);
  border-top: 1px solid rgba(220, 0, 0, 0.16);
  overflow: hidden;
}
.chapter-break::before {
  content: '';
  position: absolute;
  right: -30px;
  top: 50%;
  transform: translateY(-50%);
  width: 220px;
  height: 220px;
  border: 1px solid rgba(220, 0, 0, 0.22);
  border-radius: 50%;
  box-shadow: 0 0 70px rgba(220, 0, 0, 0.12);
  pointer-events: none;
}
/* 扫描光带 */
.chapter-break .wrap::after {
  content: '';
  position: absolute;
  left: -20%;
  top: -40%;
  bottom: -40%;
  width: 26%;
  background: linear-gradient(105deg, transparent 0%, rgba(220, 0, 0, 0.07) 45%, rgba(255, 255, 255, 0.05) 50%, rgba(220, 0, 0, 0.07) 55%, transparent 100%);
  transform: skewX(-14deg);
  animation: scanSweep 7s ease-in-out infinite;
  pointer-events: none;
}
@keyframes scanSweep {
  0% { left: -30%; opacity: 0; }
  12% { opacity: 1; }
  42% { left: 110%; opacity: 0; }
  100% { left: 110%; opacity: 0; }
}
.chapter-break::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--red), transparent);
  transition: width 1.1s var(--ease2) 0.35s;
}
.chapter-break.is-in::after { width: 100%; }
.chapter-break__watermark {
  position: absolute;
  right: clamp(16px, 3vw, 48px);
  bottom: 8px;
  font-size: clamp(90px, 16vw, 190px);
  line-height: 1;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 255, 255, 0.05);
  pointer-events: none;
  user-select: none;
}
.chapter-break .wrap { position: relative; display: grid; grid-template-columns: auto 1fr; gap: 12px 40px; align-items: end; padding-left: 26px; border-left: 3px solid var(--red); box-shadow: inset 34px 0 46px -30px rgba(220, 0, 0, 0.45); }
.cb__no {
  font-size: clamp(46px, 6vw, 72px);
  color: var(--red);
  line-height: 1;
  grid-row: 1 / 3;
  align-self: center;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s var(--ease2), transform 0.7s var(--ease2);
}
.chapter-break.is-in .cb__no {  }

.cb__name {
  font-weight: 400;
  font-size: clamp(36px, 5vw, 62px);
  line-height: 1.05;
  color: transparent;
  background: linear-gradient(115deg, #ff5a4d 0%, #dc0000 45%, #ff8a2a 100%);
  -webkit-background-clip: text;
  background-clip: text;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s var(--ease2) 0.08s, transform 0.7s var(--ease2) 0.08s;
}


.cb__en {
  display: block;
  font-size: 0.26em;
  letter-spacing: 0.4em;
  color: var(--faint);
  margin-top: 14px;
  font-weight: 400;
}
.cb__meta {
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--faint);
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.7s var(--ease2) 0.16s, transform 0.7s var(--ease2) 0.16s;
}
.cb__lead {
  grid-column: 1 / -1;
  max-width: 620px;
  color: var(--dim);
  font-size: 17px;
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.7s var(--ease2) 0.24s, transform 0.7s var(--ease2) 0.24s;
}
.chapter-break.is-in .cb__no, .chapter-break.is-in .cb__name,
.chapter-break.is-in .cb__meta, .chapter-break.is-in .cb__lead { opacity: 1; transform: none; }

/* ============ 章节内容 ============ */
.sec-title {
  font-weight: 400;
  font-size: clamp(26px, 3.2vw, 40px);
  line-height: 1.2;
  letter-spacing: 0.02em;
  margin-bottom: 22px;
  color: #fff;
  text-shadow: 0 0 34px rgba(220, 0, 0, 0.3);
  position: relative;
  padding-bottom: 18px;
}
.sec-title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 64px;
  height: 2px;
  background: linear-gradient(90deg, var(--red), transparent);
  box-shadow: 0 0 14px rgba(220, 0, 0, 0.6);
}
.sec-title-en {
  display: block;
  font-size: 0.38em;
  letter-spacing: 0.3em;
  color: var(--faint);
  margin-top: 12px;
  text-shadow: none;
}
.story__lead {
  color: var(--dim);
  max-width: 660px;
  margin-bottom: 44px;
}
/* 标题段 + 配图左右布局 */
.lead-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: center;
  margin-bottom: 20px;
}
.lead-grid .story__lead { margin-bottom: 0; }
.lead-grid__img { position: relative; overflow: hidden; border: 1px solid var(--line); }
.lead-grid__img img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  filter: saturate(0.8);
  transition: transform 0.9s var(--ease2), filter 0.8s;
}
.lead-grid__img:hover img { transform: scale(1.04); filter: saturate(1); }
.lead-grid__img figcaption {
  position: absolute;
  left: 16px;
  bottom: 12px;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: rgba(255, 255, 255, 0.85);
}
@media (max-width: 900px) {
  .lead-grid { grid-template-columns: 1fr; }
}
.story__lead p { margin-bottom: 18px; font-size: 17px; line-height: 1.9; }
.story__lead b { color: var(--txt); font-weight: 500; }
.story__note {
  color: var(--faint);
  font-size: 13.5px;
  max-width: 720px;
  margin-top: 30px;
  line-height: 1.8;
}

/* ============ 影像 ============ */
.design__hero, .interior__hero {
  position: relative;
  margin: 40px 0 60px;
  overflow: hidden;
}
.design__hero img, .interior__hero img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.8) contrast(1.06);
}
.design__hero figcaption, .interior__hero figcaption,
.media-row__img figcaption, .pt__main figcaption, .bespoke__img figcaption {
  position: absolute;
  left: 20px;
  bottom: 16px;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: rgba(255, 255, 255, 0.82);
}
.media-full {
  position: relative;
  margin: 44px 0;
  overflow: hidden;
}
.media-full img, .media-full video {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.8);
}
.media-full figcaption {
  position: absolute;
  left: 20px;
  bottom: 16px;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: rgba(255, 255, 255, 0.82);
}

/* 图文交错 */
.media-row {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: clamp(28px, 4vw, 56px);
  align-items: center;
  margin: 56px 0;
}
.media-row--rev .media-row__img { order: 2; }
.media-row__img { position: relative; overflow: hidden; }
.media-row__img img, .media-row__img video {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.78);
  transition: transform 0.9s var(--ease2), filter 0.8s;
}
.media-row__img:hover img, .media-row__img:hover video { transform: scale(1.04); filter: saturate(1); }
.media-row__text h3 {
  font-weight: 400;
  font-size: clamp(22px, 2.6vw, 30px);
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}
.media-row__text h3::after {
  content: '';
  display: block;
  width: 46px;
  height: 2px;
  background: var(--red);
  margin-top: 14px;
}
.media-row__text p { color: var(--dim); font-size: 15px; line-height: 1.85; }
.media-row__text ul { list-style: none; margin-top: 14px; }
.media-row__text ul li {
  color: var(--dim);
  font-size: 14px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 20px;
}
.media-row__text ul li b { color: var(--txt); font-weight: 400; text-align: right; }

/* ============ 传承谱系卡 ============ */
.heritage__row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 56px;
}
.hcard {
  position: relative;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--panel), rgba(14, 16, 22, 0.4));
  padding: 32px 28px 30px;
  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-weight: 400; font-size: 32px; margin: 14px 0 8px; letter-spacing: 0.04em; }
.hcard__num { font-size: 24px; color: var(--red); margin-bottom: 14px; }
.hcard p:last-child { color: var(--dim); font-size: 14.5px; line-height: 1.8; }
.hcard--now { border-color: rgba(220, 0, 0, 0.45); }
.hcard--now::before {
  content: '';
  position: absolute;
  top: -1px; left: -1px; right: -1px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--red), transparent);
}

/* 马力/功率对比条 */
.compare { margin: 8px 0 48px; max-width: 720px; }
.compare h3 { font-size: 13px; color: var(--faint); letter-spacing: 0.2em; margin-bottom: 18px; }
.compare__row {
  display: grid;
  grid-template-columns: 150px 1fr 90px;
  gap: 14px;
  align-items: center;
  margin-bottom: 12px;
  font-size: 12.5px;
  color: var(--dim);
}
.compare__track {
  height: 6px;
  background: rgba(255, 255, 255, 0.07);
  overflow: hidden;
}
.compare__track i {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--red), rgba(220, 0, 0, 0.45));
  transition: width 1.6s var(--ease2) 0.2s;
}
.compare.is-in .compare__track i { width: var(--w, 50%); }
.compare__val { text-align: right; }

/* ============ 引言 ============ */
.quote {
  border-left: 2px solid var(--red);
  padding: 10px 0 10px 30px;
  max-width: 860px;
  margin: 36px 0;
  background: linear-gradient(90deg, rgba(220, 0, 0, 0.07), transparent 60%);
  border-radius: 0 8px 8px 0;
}
.quote p {
  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-size: 14px;
  color: var(--dim);
  letter-spacing: 0.08em;
  line-height: 1.8;
}
.quote .quote__en {
  display: block;
  font-size: 12.5px;
  color: var(--faint);
  font-style: italic;
  margin-top: 6px;
}

/* ============ 数据卡(数字带) ============ */
.bigstats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 18px;
  margin: 40px 0;
}
.bigstats__item {
  border-top: 2px solid var(--red);
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.bigstats__item b { font-size: clamp(30px, 3.6vw, 44px); font-weight: 400; color: #fff; line-height: 1; }
.bigstats__item span { font-size: 12.5px; color: var(--dim); letter-spacing: 0.16em; }

/* ============ 表盘 ============ */
.gauges {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 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(--red);
  stroke-linecap: round;
  stroke-dasharray: 527.8;
  stroke-dashoffset: 527.8;
  filter: drop-shadow(0 0 6px rgba(220, 0, 0, 0.5));
}
.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-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: 15px;
  color: var(--txt);
  letter-spacing: 0.1em;
}
.gauge__label small { display: block; color: var(--dim); font-size: 12.5px; margin-top: 6px; letter-spacing: 0.06em; font-weight: 400; }

/* 加速数字 */
.accel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 20px;
  margin: 40px 0 10px;
}
.accel__item { border-left: 1px solid var(--line); padding-left: 18px; }
.accel__item b { font-size: clamp(28px, 3.4vw, 42px); font-weight: 400; color: #fff; }
.accel__item span { display: block; font-size: 12.5px; color: var(--dim); margin-top: 6px; letter-spacing: 0.14em; }
.perf__note { color: var(--faint); font-size: 12px; margin-top: 20px; }

/* 卡片红色光效 */
.hcard, .dcard, .ptcard, .modecard {
  box-shadow: 0 0 0 1px rgba(220, 0, 0, 0.04), 0 8px 30px rgba(0, 0, 0, 0.35);
}
.hcard:hover, .dcard:hover, .ptcard:hover, .modecard:hover {
  box-shadow: 0 0 0 1px rgba(220, 0, 0, 0.4), 0 0 34px rgba(220, 0, 0, 0.12), 0 10px 36px rgba(0, 0, 0, 0.45);
}

/* ============ 驾驶模式 ============ */
.modes__title {
  font-size: 15px;
  letter-spacing: 0.3em;
  color: var(--red);
  text-transform: uppercase;
  margin: 56px 0 24px;
  text-align: center;
  text-shadow: 0 0 24px rgba(220, 0, 0, 0.4);
}
.modes__title::before, .modes__title::after {
  content: '';
  display: inline-block;
  width: 30px;
  height: 2px;
  background: var(--red);
  vertical-align: middle;
  margin: 0 16px;
  box-shadow: 0 0 10px rgba(220, 0, 0, 0.6);
}
.modes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}
.modecard {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 30px 28px;
  transition: border-color 0.4s, transform 0.4s var(--ease);
}
.modecard:hover { border-color: rgba(220, 0, 0, 0.5); transform: translateY(-4px); }
.modecard h4 { font-size: 14px; letter-spacing: 0.26em; color: var(--red); margin-bottom: 10px; }
.modecard__sub { font-size: 15px; color: var(--txt); margin-bottom: 12px; }
.modecard p { color: var(--dim); font-size: 14px; line-height: 1.8; }

/* ============ 车身亮点(滚动驱动,参照官方 CarHighlights) ============ */
.carhighlights {
  position: relative;
  height: 340vh;
  margin: 0;
}
.carhighlights__sticky {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: hidden;
  background: #ffffff;
}
.carhighlights__visual {
  position: absolute;
  inset: 0;
}
.carhighlights__visual img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.7s var(--ease2), visibility 0.7s;
}
.carhighlights__visual img.is-active { opacity: 1; visibility: visible; }
.carhighlights__veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to right, rgba(255, 255, 255, 0.97) 0%, rgba(255, 255, 255, 0.82) 30%, rgba(255, 255, 255, 0.1) 62%, transparent 100%),
    linear-gradient(to top, rgba(255, 255, 255, 0.4) 0%, transparent 28%);
}
.carhighlights__inner {
  position: relative;
  z-index: 2;
  width: min(1280px, calc(100% - 48px));
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
}
.carhighlights__kicker {
  font-size: 11px;
  letter-spacing: 0.4em;
  color: var(--red);
  text-transform: uppercase;
  margin-bottom: 16px;
}
.carhighlights__title {
  font-weight: 400;
  font-size: clamp(28px, 3.6vw, 44px);
  margin-bottom: 30px;
  line-height: 1.15;
  color: #0a0a0c;
}
.carhighlights__items { position: relative; min-height: 190px; max-width: 560px; }
.carhighlights__item {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity 0.5s var(--ease2), transform 0.5s var(--ease2), visibility 0.5s;
}
.carhighlights__item.is-active { opacity: 1; visibility: visible; transform: none; }
.carhighlights__item h3 {
  font-weight: 400;
  font-size: clamp(20px, 2.4vw, 28px);
  margin-bottom: 12px;
  letter-spacing: 0.02em;
  color: #0a0a0c;
}
.carhighlights__item h3::before {
  content: attr(data-no);
  display: inline-block;
  font-size: 0.55em;
  color: var(--red);
  margin-right: 12px;
  letter-spacing: 0.1em;
}
.carhighlights__item p { color: #3a3a42; font-size: 14.5px; line-height: 1.85; max-width: 460px; }
.carhighlights__progress {
  margin-top: 26px;
  width: 220px;
  height: 2px;
  background: rgba(10, 10, 12, 0.15);
  position: relative;
}
.carhighlights__progress i {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: var(--red);
  transition: width 0.2s linear;
}
@media (max-width: 900px) {
  .carhighlights__inner { align-items: flex-end; padding-bottom: 12vh; }
  .carhighlights__veil { background: linear-gradient(to top, rgba(255,255,255,0.96) 0%, rgba(255,255,255,0.7) 40%, transparent 75%); }
  .carhighlights { height: 480vh; }
}

/* ============ 设计卡片 ============ */
.design__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px 24px;
  margin: 48px 0;
}
.design__grid .dcard:nth-child(even) { margin-top: 52px; }
@media (max-width: 768px) {
  .design__grid { grid-template-columns: 1fr; gap: 24px; }
  .design__grid .dcard:nth-child(even) { margin-top: 0; }
}
.dcard {
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
  position: relative;
  transition: border-color 0.4s, transform 0.3s var(--ease);
  will-change: transform;
}
.dcard:hover { border-color: rgba(220, 0, 0, 0.5); }
.dcard img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.75);
  transition: transform 0.8s var(--ease2), filter 0.8s;
}
.dcard:hover img { transform: scale(1.05); filter: saturate(1); }
.dcard::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(320px circle at var(--mx, 50%) var(--my, 50%), rgba(220, 0, 0, 0.12), transparent 60%);
  opacity: 0;
  transition: opacity 0.4s;
  pointer-events: none;
}
.dcard:hover::after { opacity: 1; }
.dcard__body { padding: 20px 22px 24px; }
.dcard__body h3 {
  font-weight: 400;
  font-size: 20px;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}
.dcard__body h3::after {
  content: '';
  display: block;
  width: 30px;
  height: 1.5px;
  background: var(--red);
  margin-top: 10px;
}
.dcard__body p { color: var(--dim); font-size: 14px; line-height: 1.8; }
.tilt { transition: transform 0.3s var(--ease); }
@media (max-width: 768px) {
  .design__grid { grid-template-columns: 1fr; }
}

/* ============ 全宽视频区 ============ */
.vsection {
  position: relative;
  height: clamp(420px, 64vh, 700px);
  margin: 48px 0;
  overflow: hidden;
}
.vsection__video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06) brightness(1.08);
  transform: scale(1.04);
  transition: transform 2s 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, 0.45) 40%, rgba(5, 5, 7, 0.15) 75%, rgba(5, 5, 7, 0.35) 100%),
    linear-gradient(to right, rgba(5, 5, 7, 0.6) 0%, transparent 55%);
}
.vsection__content {
  position: absolute;
  left: clamp(22px, 4vw, 56px);
  bottom: clamp(28px, 5vh, 48px);
  max-width: 620px;
  z-index: 2;
}
.vsection__kicker {
  font-size: 11px;
  letter-spacing: 0.4em;
  color: var(--red);
  text-transform: uppercase;
  margin-bottom: 14px;
}
.vsection__title {
  font-weight: 400;
  font-size: clamp(26px, 3.6vw, 44px);
  color: #fff;
  letter-spacing: 0.02em;
  margin-bottom: 12px;
}
.vsection__text { font-size: 15px; color: var(--dim); max-width: 500px; }

/* ============ 视频卡(webcard) ============ */
.webcards { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 40px 0; }
.webcards--inline { display: block; }
.webcard {
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
  transition: border-color 0.4s;
}
.webcard:hover { border-color: var(--line2); }
.webcard__video {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.8);
  transition: filter 0.5s, transform 0.8s var(--ease2);
}
.webcard:hover .webcard__video { filter: saturate(1); transform: scale(1.02); }
.webcard__body { padding: 24px 26px 28px; }
.webcard__num {
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--red);
}
.webcard__body h3 {
  font-weight: 400;
  font-size: 22px;
  margin: 10px 0 8px;
  letter-spacing: 0.04em;
}
.webcard__body p { color: var(--dim); font-size: 14px; line-height: 1.8; }
.webcard--inline {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  align-items: center;
  margin: 28px 0;
}
.webcard--inline .webcard__video { aspect-ratio: 16 / 9; height: 100%; min-height: 220px; }
.webcard--inline .webcard__body { padding: 28px 32px; }

/* ============ 三卡(pt) ============ */
.pt__three {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 40px 0;
}
.ptcard {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 28px 26px;
  transition: border-color 0.4s, transform 0.4s var(--ease);
}
.ptcard:hover { border-color: rgba(220, 0, 0, 0.5); transform: translateY(-4px); }
.ptcard h3 { font-size: 13px; letter-spacing: 0.2em; color: var(--dim); margin-bottom: 14px; }
.ptcard__big { font-size: clamp(32px, 3.6vw, 44px); font-weight: 400; color: #fff; margin-bottom: 16px; }
.ptcard__big span { color: var(--red); font-size: 0.55em; }
.ptcard ul { list-style: none; }
.ptcard li {
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
  font-size: 13.5px;
  color: var(--dim);
  letter-spacing: 0.06em;
}
.ptcard__note { font-size: 12.5px; color: var(--faint); margin-top: 14px; line-height: 1.7; }

/* ============ 动力章节主图 ============ */
.pt__main {
  position: relative;
  margin: 40px 0 8px;
  overflow: hidden;
}
.pt__main img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(0.8);
}

/* ============ 空动列表 ============ */
.aero__list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 48px;
  margin: 48px 0;
}
.aero__list article {
  border-bottom: 1px solid var(--line);
  padding: 22px 0;
  transition: padding-left 0.4s var(--ease);
}
.aero__list article:hover { padding-left: 12px; }
.aero__no { font-size: 12px; color: var(--red); letter-spacing: 0.2em; }
.aero__list h3 { font-weight: 400; font-size: 21px; margin: 8px 0 8px; }
.aero__list p { color: var(--dim); font-size: 14px; line-height: 1.85; }

/* ============ 空动热点(交互) ============ */
.aero-stage {
  position: relative;
  margin: 36px auto;
  max-width: 1000px;
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}
.aero__viewer {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 8.4;
  min-height: 300px;
  background: #000;
}
.aero__media {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  z-index: 1;
  transition: opacity 0.6s var(--ease), visibility 0.6s;
}
.aero__media.is-active { opacity: 1; visibility: visible; pointer-events: auto; z-index: 2; }
.aero__media img, .aero__media video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.85);
}
.aero__media-fallback {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.aero__hotspot {
  position: absolute;
  transform: translate(-50%, -50%);
  z-index: 5;
}
.aero__dot {
  display: block;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 2px solid #fff;
  background: var(--red);
  box-shadow: 0 0 0 0 rgba(220, 0, 0, 0.6);
  animation: pulse 2.4s var(--ease) infinite;
  transition: transform 0.3s;
}
.aero__hotspot:hover .aero__dot { transform: scale(1.5); }
.aero__hotspot.is-active .aero__dot {
  background: #fff;
  border-color: var(--red);
  animation: none;
  box-shadow: 0 0 0 6px rgba(220, 0, 0, 0.35);
}
.aero__hotspot i {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 12px);
  transform: translateX(-50%) translateY(5px);
  font-style: normal;
  font-size: 10.5px;
  letter-spacing: 0.22em;
  background: rgba(5, 5, 7, 0.85);
  border: 1px solid var(--line2);
  padding: 5px 10px;
  white-space: nowrap;
  color: var(--txt);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s, transform 0.3s;
}
.aero__hotspot:hover i { opacity: 1; transform: translateX(-50%) translateY(0); }
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(220, 0, 0, 0.5); }
  70% { box-shadow: 0 0 0 16px rgba(220, 0, 0, 0); }
  100% { box-shadow: 0 0 0 0 rgba(220, 0, 0, 0); }
}
.aero__hotspot[data-aero="sduct"] { left: 22%; top: 40%; }
.aero__hotspot[data-aero="wing"] { left: 80%; top: 22%; }
.aero__hotspot[data-aero="cooling"] { left: 66%; top: 36%; }
.aero__hotspot[data-aero="floor"] { left: 56%; top: 70%; }
.aero__panel {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 4;
  max-height: 46%;
  overflow: hidden;
  padding: clamp(18px, 3vw, 30px);
  background: linear-gradient(to top, rgba(5, 5, 7, 0.94) 0%, rgba(5, 5, 7, 0.72) 60%, transparent 100%);
  min-height: 0;
  pointer-events: none;
}
.aero__panel-item { display: none; }
.aero__panel-item.is-active { display: block; animation: fadeUp 0.5s var(--ease2); }
@keyframes fadeUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
.aero__panel-item h3 {
  font-weight: 400;
  font-size: 20px;
  margin-bottom: 10px;
  letter-spacing: 0.04em;
}
.aero__panel-item h3::before {
  content: '';
  display: inline-block;
  width: 26px;
  height: 2px;
  background: var(--red);
  vertical-align: middle;
  margin-right: 12px;
}
.aero__panel-item p { color: var(--dim); font-size: 14.5px; max-width: 780px; line-height: 1.85; }

/* ============ 时间线 ============ */
.timeline {
  position: relative;
  max-width: 860px;
  margin: 48px 0;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 72px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--red), rgba(220, 0, 0, 0.15));
}
.tl-item { position: relative; padding: 0 0 44px 96px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-date {
  position: absolute;
  left: 0;
  top: 4px;
  width: 60px;
  text-align: right;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--dim);
}
.tl-item::before {
  content: '';
  position: absolute;
  left: 68px;
  top: 10px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--red);
  box-shadow: 0 0 8px rgba(220, 0, 0, 0.5);
}
.tl-body {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 22px;
  align-items: center;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 14px;
  transition: border-color 0.4s;
}
.tl-body:hover { border-color: var(--line2); }
.tl-body img {
  width: 100%;
  height: 130px;
  object-fit: cover;
  filter: saturate(0.8);
}
.tl-text h3 { font-weight: 400; font-size: 19px; margin-bottom: 6px; }
.tl-text p { color: var(--dim); font-size: 13.5px; line-height: 1.8; }

/* ============ 规格表 ============ */
.spec-table {
  max-width: 860px;
  border-top: 1px solid var(--line);
  margin: 40px 0 20px;
}
.spec-table__row {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 24px;
  padding: 15px 12px;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
  transition: background 0.3s;
}
.spec-table__row:hover { background: var(--red-soft); }
.spec-table__row > span { color: var(--faint); letter-spacing: 0.08em; }
.spec-table__row b { color: var(--txt); font-weight: 400; line-height: 1.7; }
.specs__note { color: var(--faint); font-size: 12px; margin-top: 20px; }

/* ============ 图库 ============ */
.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 48px;
}
.gallery__item {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--panel);
  padding: 0;
  display: block;
}
.gallery__item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.8);
  transition: transform 0.8s var(--ease2), filter 0.8s;
}
.gallery__item:hover img { transform: scale(1.05); filter: saturate(1); }
.gallery__item i {
  position: absolute;
  left: 14px;
  bottom: 12px;
  font-style: normal;
  font-size: 10.5px;
  letter-spacing: 0.26em;
  color: rgba(255, 255, 255, 0.8);
  opacity: 0;
  transition: opacity 0.35s;
}
.gallery__item:hover i { opacity: 1; }

/* ============ 总结 ============ */
.conclusion { background: linear-gradient(180deg, var(--bg2), var(--bg)); }
.conclusion__inner { max-width: 860px; margin: 0 auto; text-align: center; }
.conclusion__en {
  font-size: 13px;
  letter-spacing: 0.5em;
  color: var(--red);
  margin-bottom: 20px;
}
.conclusion__title {
  font-weight: 400;
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1.1;
  margin-bottom: 44px;
}
.final-stats {
  display: flex;
  justify-content: center;
  gap: 60px;
  margin-bottom: 48px;
}
.final-stats__item b { font-size: clamp(36px, 5vw, 60px); font-weight: 400; color: #fff; }
.final-stats__item span { display: block; font-size: 13px; color: var(--dim); letter-spacing: 0.2em; margin-top: 8px; }
.conclusion__lead {
  color: var(--dim);
  font-size: 17px;
  line-height: 2;
  max-width: 680px;
  margin: 0 auto 36px;
}
.conclusion__lead b { color: #fff; font-weight: 500; }
.conclusion .quote { text-align: left; margin: 0 auto 44px; }
.conclusion__links {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}
.conclusion__btn {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.2em;
  padding: 15px 34px;
  background: var(--red);
  color: #fff;
  transition: background 0.3s, transform 0.3s var(--ease);
}
.conclusion__btn:hover { background: #f40000; transform: translateY(-2px); }
.conclusion__btn--ghost {
  background: transparent;
  border: 1px solid var(--line2);
  color: var(--txt);
}
.conclusion__btn--ghost:hover { border-color: var(--red); color: var(--red); background: transparent; }

/* ============ 页脚 ============ */
.footer {
  border-top: 1px solid var(--line);
  padding: 48px 0 56px;
}
.footer__top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 28px;
}
.footer__brand { font-size: 14px; letter-spacing: 0.3em; }
.footer__brand span { color: var(--red); }
.footer__links { display: flex; gap: 22px; }
.footer__links a {
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--dim);
  transition: color 0.25s;
}
.footer__links a:hover { color: var(--red); }
.footer__disclaimer p {
  font-size: 12.5px;
  color: var(--faint);
  max-width: 720px;
  line-height: 1.8;
}

/* ============ 灯箱 ============ */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 210;
  background: rgba(5, 5, 7, 0.96);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s, visibility 0.35s;
}
.lightbox.is-open { opacity: 1; visibility: visible; }
.lightbox__stage { max-width: min(1200px, 88vw); max-height: 82vh; }
.lightbox__stage img { max-width: 100%; max-height: 72vh; object-fit: contain; }
.lightbox__stage figcaption {
  margin-top: 12px;
  font-size: 11.5px;
  letter-spacing: 0.24em;
  color: var(--dim);
  text-align: center;
}
.lightbox__close {
  position: absolute;
  top: 22px;
  right: 30px;
  font-size: 30px;
  color: var(--txt);
  z-index: 2;
  transition: color 0.25s, transform 0.25s;
}
.lightbox__close:hover { color: var(--red); transform: rotate(90deg); }
.lightbox__prev, .lightbox__next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 42px;
  color: var(--dim);
  padding: 14px;
  z-index: 2;
  transition: color 0.25s;
}
.lightbox__prev { left: 18px; }
.lightbox__next { right: 18px; }
.lightbox__prev:hover, .lightbox__next:hover { color: var(--red); }

/* ============ 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; }

/* 图片缩放揭示 */
.zoom img {
  transform: scale(1.08);
  transition: transform 1.6s var(--ease2);
}
.zoom.is-in img { transform: scale(1); }

/* 视差 */
.parallax { will-change: transform; }

/* 点击波纹 */
.ripple {
  position: fixed;
  width: 14px;
  height: 14px;
  margin: -7px 0 0 -7px;
  border-radius: 50%;
  border: 1px solid rgba(220, 0, 0, 0.6);
  pointer-events: none;
  z-index: 9998;
  animation: rippleAnim 0.75s var(--ease) forwards;
}
@keyframes rippleAnim {
  from { transform: scale(1); opacity: 0.8; }
  to { transform: scale(7); opacity: 0; }
}

/* 卡片点击脉冲 */
.is-tapped { animation: tapped 0.45s var(--ease); }
@keyframes tapped {
  0% { filter: brightness(1); }
  40% { filter: brightness(1.35); }
  100% { filter: brightness(1); }
}

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
  .heritage__row { grid-template-columns: repeat(2, 1fr); }
  .modes { grid-template-columns: 1fr; }
  .media-row { grid-template-columns: 1fr; }
  .media-row--rev .media-row__img { order: 0; }
  .webcard--inline { grid-template-columns: 1fr; }
  .pt__three { grid-template-columns: 1fr; }
  .aero__list { grid-template-columns: 1fr; }
  .webcards { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .index-rail, .scroll-gauge { display: none; }
  .section { padding: 90px 0; }
  .chapter-break .wrap { grid-template-columns: 1fr; }
  .cb__no { grid-row: auto; }
  .spec-table__row { grid-template-columns: 1fr; gap: 4px; }
  .tl-body { grid-template-columns: 1fr; }
  .tl-body img { height: 180px; }
  .timeline::before { left: 8px; }
  .tl-item { padding-left: 36px; }
  .tl-date { position: static; text-align: left; margin-bottom: 8px; width: auto; }
  .tl-item::before { left: 4px; }
  .hero__specs { gap: 24px; flex-wrap: wrap; }
  .aero__hotspot i { display: none; }
}

@media (max-width: 480px) {
  .heritage__row { grid-template-columns: 1fr; }
  .final-stats { gap: 20px 28px; flex-wrap: wrap; }
  .final-stats__item b { font-size: 30px; }
  .nav { padding: 14px 12px; }
  .nav__brand-mark { font-size: 14px; letter-spacing: 0.24em; }
  .nav__right { gap: 10px; }
  .nav__menu-btn { width: 34px; height: 34px; }
  .nav__menu-icon { gap: 4px; }
  .nav__menu-icon i { width: 12px; }
}

/* ============ 动效降级 ============ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  .hero__title span { transform: none; animation: none; }
  .zoom img { transform: none; }
  .cursor, .glow { display: none; }
}

/* 章节明暗交替:偶数章节微亮背景 + 顶部红色光带 */
#design, #powertrain, #architecture {
  background: linear-gradient(180deg, #0e1017 0%, #08090d 100%);
}
main section:not(.hero) {
  box-shadow: inset 0 1px 0 rgba(220, 0, 0, 0.07);
}
/* 卡片渐变提亮 */
.hcard, .dcard, .ptcard, .modecard, .webcard, .aero-stage, .lead-grid__img, .media-row__img {
  background: linear-gradient(180deg, var(--panel2) 0%, var(--panel) 100%);
}
/* 数据带光效 */
.bigstats__item {
  border-top: 2px solid rgba(220, 0, 0, 0.55);
  box-shadow: 0 3px 16px -8px rgba(220, 0, 0, 0.3);
}
/* 图片区默认微光 */
.media-row__img, .lead-grid__img, .design__hero, .interior__hero {
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.06), 0 18px 44px -18px rgba(0, 0, 0, 0.65);
}
/* 水印提亮 */
.chapter-break__watermark {
  -webkit-text-stroke-color: rgba(255, 255, 255, 0.09);
}
/* 分隔线红色微光 */
.chapter-break { border-top: 1px solid rgba(220, 0, 0, 0.16); }
.footer { border-top: 1px solid rgba(220, 0, 0, 0.1); }

/* ============ 细节美化与互动增强 ============ */
/* 数据卡 hover 发光 */
.bigstats__item { transition: transform 0.35s var(--ease); }
.bigstats__item:hover { transform: translateY(-3px); }
.bigstats__item:hover b { color: var(--red); text-shadow: 0 0 26px rgba(220, 0, 0, 0.55); }
.accel__item { transition: transform 0.35s var(--ease); }
.accel__item:hover { transform: translateX(6px); }
.accel__item:hover b { color: var(--red); text-shadow: 0 0 22px rgba(220, 0, 0, 0.5); }
/* 引言 hover 光晕 */
.quote { transition: box-shadow 0.4s, border-color 0.4s; }
.quote:hover { border-color: var(--red); box-shadow: -18px 0 34px -22px rgba(220, 0, 0, 0.45); }
/* 标题下划线生长 */
.sec-title::after { transform-origin: left; animation: secLine 1.2s var(--ease2) 0.4s backwards; }
@keyframes secLine { from { transform: scaleX(0); } to { transform: scaleX(1); } }
/* 视频卡 hover 上浮 */
.webcard { transition: border-color 0.4s, transform 0.4s var(--ease), box-shadow 0.4s; }
.webcard:hover { transform: translateY(-4px); box-shadow: 0 0 0 1px rgba(220, 0, 0, 0.25), 0 16px 40px rgba(0, 0, 0, 0.4); }
/* ptcard 数字 hover 变红 */
.ptcard:hover .ptcard__big { color: var(--red); text-shadow: 0 0 26px rgba(220, 0, 0, 0.45); }
.ptcard:hover .ptcard__big span { color: #fff; }
/* modecard 标题 hover 亮起 */
.modecard:hover h4 { text-shadow: 0 0 18px rgba(220, 0, 0, 0.6); }
/* 卡片 hover 光边跟随(通用) */
.hcard, .dcard, .ptcard, .modecard, .webcard { position: relative; }
.hcard:hover::after, .ptcard:hover::after, .modecard:hover::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(340px circle at var(--mx, 50%) var(--my, 50%), rgba(220, 0, 0, 0.08), transparent 62%);
  pointer-events: none;
}
/* 章节大标题 hover 微亮 */

/* 章节水印漂浮 */
.chapter-break__watermark {
  animation: wmFloat 9s ease-in-out infinite;
}
@keyframes wmFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
/* reveal 支持 stagger(--d) */
.reveal { transition-delay: var(--d, 0s); }

/* 按钮光晕扩散 */
.conclusion__btn { position: relative; overflow: hidden; }
.conclusion__btn::after {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 40%;
  background: linear-gradient(105deg, transparent, rgba(255, 255, 255, 0.25), transparent);
  transform: skewX(-18deg);
  animation: btnShine 3.4s ease-in-out infinite;
  pointer-events: none;
}
@keyframes btnShine {
  0% { left: -50%; }
  55% { left: 130%; }
  100% { left: 130%; }
}
/* 数据带数字常驻微光 */
.bigstats__item b { text-shadow: 0 0 18px rgba(220, 0, 0, 0.16); }
/* gauge 标签微光 */
.gauge__label { text-shadow: 0 0 14px rgba(220, 0, 0, 0.1); }
/* 导航当前章节红点呼吸 */
.chapter-nav button.is-active { animation: navDot 2.6s ease-in-out infinite; }
@keyframes navDot {
  0%, 100% { box-shadow: 0 0 0 0 rgba(220, 0, 0, 0.5); }
  50% { box-shadow: 0 0 0 6px rgba(220, 0, 0, 0); }
}
/* 空动红点提示:提示用户可点击 */
.aero__hotspot i { animation: tipFloat 2.2s ease-in-out infinite; }
@keyframes tipFloat {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(-4px); }
}

/* ============ 左右方向入场动画 ============ */
/* 仅淡入(用于图文区父容器,子元素做左右动画) */
.reveal--fade { transform: none; }
.reveal--left { transform: translateX(-46px); }
.reveal--right { transform: translateX(46px); }
.reveal--left.is-in, .reveal--right.is-in { transform: none; }

/* 图文交错:图与文分别从两侧进入(rev 版反向) */
.media-row .media-row__img { transform: translateX(-46px); }
.media-row .media-row__text { transform: translateX(46px); }
.media-row--rev .media-row__img { transform: translateX(46px); }
.media-row--rev .media-row__text { transform: translateX(-46px); }
.media-row .media-row__img.is-in, .media-row .media-row__text.is-in { transform: none; }

/* 卡片组交替进入 */
.design__grid .dcard:nth-child(odd),
.heritage__row .hcard:nth-child(odd),
.aero__list article:nth-child(odd) { transform: translateX(-46px); }
.design__grid .dcard:nth-child(even),
.heritage__row .hcard:nth-child(even),
.aero__list article:nth-child(even) { transform: translateX(46px); }
.design__grid .dcard.is-in,
.heritage__row .hcard.is-in,
.aero__list article.is-in { transform: none; }

.pt__three .ptcard:first-child,
.modes .modecard:first-child { transform: translateX(-46px); }
.pt__three .ptcard:last-child,
.modes .modecard:last-child { transform: translateX(46px); }
.pt__three .ptcard.is-in,
.modes .modecard.is-in { transform: none; }

.webcard--inline:nth-child(odd) { transform: translateX(-46px); }
.webcard--inline:nth-child(even) { transform: translateX(46px); }
.webcard--inline.is-in { transform: none; }

/* 引言:自左侧进入 */
.quote { transform: translateX(-46px); }
.quote.is-in { transform: none; }