/* ============================================================
   Bugatti Tourbillon · Luxury 增强层
   深蓝 × 钛银白 · 精密机械（陀飞轮）主题
   追加于 css/style.css 之后加载；只新增/覆盖样式，
   不改动 style.css 任何既有规则。
   点缀色沿用站内既有钛银金属 --metal 与品牌蓝 --blue，
   不引入金色。
   ============================================================ */

/* ---------- 品牌色系统扩展 ---------- */
:root {
  --steel: #c9ccd3;                        /* 钛银（与站内 --metal 一致） */
  --steel-bright: #f2f4f8;                 /* 亮银白：渐变高光端 */
  --steel-dim: rgba(201, 204, 211, 0.32);  /* 银灰：细线、描边 */
  --steel-soft: rgba(201, 204, 211, 0.10); /* 银灰：浅底、光斑 */
  --blue-lux: #6f9dff;                     /* 明亮蓝：光效点缀（站内既有色） */
  --ink: #06070d;                          /* 深蓝黑：玻璃底、阴影基色 */
  --ink-glass: rgba(8, 10, 17, 0.72);      /* 玻璃拟态底 */
  --shadow-lux: 0 26px 60px -28px rgba(0, 0, 0, 0.85);
  --ease-lux: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- 全局质感：深蓝黑微光底（只叠加 background-image，不改底色） ---------- */
body {
  background-image:
    radial-gradient(1200px 560px at 88% -10%, rgba(0, 75, 250, 0.09), transparent 60%),
    radial-gradient(960px 520px at -12% 32%, rgba(201, 204, 211, 0.035), transparent 55%);
  text-rendering: optimizeLegibility;
}

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

a:focus-visible, button:focus-visible {
  outline: 2px solid var(--blue-lux);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- 排版层级：标题/英文小标/章节标签 ---------- */
.sec-title { letter-spacing: 0.02em; }
.sec-title::after { background: linear-gradient(90deg, var(--blue), transparent); }
.sec-title-en { color: var(--steel-bright); letter-spacing: 0.22em; }
.sec-tag { text-shadow: 0 0 16px rgba(0, 75, 250, 0.35); }
.sec-lead { color: #c8c8d2; }

/* ---------- 导航：滚动实底后深蓝黑玻璃 + 蓝色底线 + 阴影 ---------- */
.nav.is-solid {
  background: var(--ink-glass);
  box-shadow: 0 14px 44px -22px rgba(0, 0, 0, 0.85);
}
.nav.is-solid::after {
  content: '';
  position: absolute;
  left: 24px; right: 24px; bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(111, 157, 255, 0.45), transparent);
  opacity: 0.75;
  pointer-events: none;
}

/* 锚点跳转预留导航高度（不改变 scroll-behavior，不干扰现有 JS 瞬时定位） */
html { scroll-padding-top: 88px; }

/* ---------- Hero：陀飞轮光效 + 金属细节 ---------- */
.hero__veil {
  background:
    radial-gradient(56% 44% at 74% 26%, rgba(201, 204, 211, 0.10), rgba(201, 204, 211, 0.03) 45%, transparent 70%),
    radial-gradient(46% 36% at 22% 62%, rgba(0, 75, 250, 0.16), transparent 68%),
    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%);
}
/* 缓慢旋转的蓝白光带：机械腕表游丝意象 */
.hero__veil::before {
  content: '';
  position: absolute;
  inset: -45%;
  background: conic-gradient(from 0deg,
    transparent 0deg, rgba(201, 204, 211, 0.08) 38deg, transparent 92deg,
    rgba(0, 75, 250, 0.08) 190deg, transparent 250deg,
    rgba(201, 204, 211, 0.08) 318deg, transparent 360deg);
  animation: lux-rotate 52s linear infinite;
  will-change: transform;
  pointer-events: none;
}
@keyframes lux-rotate { to { transform: rotate(1turn); } }

.hero__title {
  text-shadow:
    0 2px 34px rgba(111, 157, 255, 0.18),
    0 0 110px rgba(0, 75, 250, 0.22);
}
/* 数据数字：钛银金属渐变（与站内 --metal 同源） */
.hero__specs b {
  background: linear-gradient(150deg, #ffffff 0%, #d7dbe2 48%, #9aa3b3 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}
.hero__line { background: var(--steel-dim); }
.hero__line::after { background: linear-gradient(180deg, transparent, var(--blue-lux)); }

/* ---------- 卡片：浮起 + 深阴影 + 银蓝描边（微交互） ---------- */
.hcard, .dcard, .tcard, .bstat, .modes__panel, .ptcard, .modecard, .webcard, .tour__card, .dcard2 {
  position: relative;
  transition:
    transform 0.5s var(--ease-lux),
    box-shadow 0.5s var(--ease-lux),
    border-color 0.5s var(--ease-lux),
    background-color 0.5s var(--ease-lux);
}
.hcard:hover, .dcard:hover, .tcard:hover, .bstat:hover, .modes__panel:hover,
.ptcard:hover, .modecard:hover, .webcard:hover, .tour__card:hover, .dcard2:hover {
  border-color: rgba(111, 157, 255, 0.4);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.35),
    var(--shadow-lux),
    0 0 30px -14px rgba(0, 75, 250, 0.35);
  transform: translateY(-6px);
}

/* .dcard 复用 main.js 已写入的 --mx/--my：鼠标高光保持品牌蓝 */
.dcard::after {
  background: radial-gradient(340px circle at var(--mx, 50%) var(--my, 50%), rgba(0, 75, 250, 0.18), transparent 62%);
}

/* 其余大卡片：蓝色径向光跟随鼠标（--mx/--my 由 luxury.js 写入） */
.hcard::after, .bstat::after, .modes__panel::after, .ptcard::after, .tour__card::after, .dcard2::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(320px circle at var(--mx, 50%) var(--my, 50%), rgba(0, 75, 250, 0.13), transparent 62%);
  opacity: 0;
  transition: opacity 0.4s;
  pointer-events: none;
}
.hcard:hover::after, .bstat:hover::after, .modes__panel:hover::after,
.ptcard:hover::after, .tour__card:hover::after, .dcard2:hover::after { opacity: 1; }

/* ---------- 玻璃拟态（克制使用） ---------- */
.menu-overlay { background: rgba(6, 7, 13, 0.86); }
.hotspot::after {
  background: var(--ink-glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(111, 157, 255, 0.4);
}

/* ---------- 章节卡：钛银编号 + 蓝色进度线辉光 ---------- */
.cb__no { color: var(--metal); }
.chapter-break::after {
  background: linear-gradient(90deg, var(--blue), rgba(0, 75, 250, 0.25), transparent);
  box-shadow: 0 0 16px rgba(0, 75, 250, 0.4);
}

/* ---------- 滚动进度表盘：品牌蓝描边 + 辉光 ---------- */
.scroll-gauge .sg__bar {
  stroke: var(--blue-lux);
  filter: drop-shadow(0 0 4px rgba(0, 75, 250, 0.6));
}

/* ---------- 页脚 ---------- */
.footer__top { border-top: 1px solid var(--steel-dim); }
.footer__portal-title { text-shadow: 0 0 30px rgba(0, 75, 250, 0.28); }
.footer__portal-dot { color: var(--blue-lux); }

/* ---------- 补充滚动显现（类由 luxury.js 注入，不重复观察已有 .reveal） ---------- */
.lux-reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease-lux), transform 0.8s var(--ease-lux);
}
.lux-reveal.is-in { opacity: 1; transform: none; }

/* ---------- 响应式细节 ---------- */
@media (max-width: 768px) {
  .section { padding: 72px 0; }
  .hero__title { font-size: clamp(56px, 15vw, 100px); }
  .hero__specs { gap: 22px; flex-wrap: wrap; }
  .hero__scroll { right: 18px; bottom: 20px; }
}
@media (max-width: 480px) {
  .hero__kicker { letter-spacing: 0.24em; }
  .hero__sub { letter-spacing: 0.16em; }
  .hero__specs { gap: 16px 20px; }
}

/* ---------- 无障碍降级：用户偏好减少动效时全部关闭 ---------- */
@media (prefers-reduced-motion: reduce) {
  .hero__veil::before,
  .hero__line::after { animation: none !important; }
  .hcard, .dcard, .tcard, .bstat, .modes__panel, .ptcard, .modecard, .webcard, .tour__card, .dcard2 {
    transition: none !important;
  }
  .hcard::after, .bstat::after, .modes__panel::after, .ptcard::after, .tour__card::after, .dcard2::after,
  .dcard::after { transition: none !important; }
  .lux-reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* ---------- 打印保护：style.css 的 print 块早于本文件，这里兜底 ---------- */
@media print {
  body { background-image: none !important; }
  .hero__veil::before,
  .nav.is-solid::after { display: none !important; }
}
/* ---------- HYPERCAR 门户跳转 ---------- */
.portal-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  width: fit-content;
  max-width: calc(100% - 48px);
  margin: 52px auto 20px;
  padding: 15px 40px;
  border: 1.5px solid var(--accent, var(--blue-lux, var(--red, var(--gold))));
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.045);
  color: var(--ink-dim, var(--dim));
  font-family: var(--font-mono, var(--mono));
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-decoration: none;
  transition: border-color .35s, color .35s, background .35s, transform .35s;
}
.portal-bar:hover { transform: translateY(-2px); background: rgba(255, 255, 255, 0.09); }
.portal-bar__rule {
  width: 36px;
  height: 1px;
  flex: none;
  background: linear-gradient(90deg, transparent, var(--accent, var(--blue-lux, var(--red, var(--gold)))));
}
.portal-bar__rule--r { background: linear-gradient(90deg, var(--accent, var(--blue-lux, var(--red, var(--gold)))), transparent); }
.portal-bar__badge {
  width: 24px;
  height: 24px;
  border-radius: 7px;
  flex: none;
  display: grid;
  place-items: center;
  background: var(--accent, var(--blue-lux, var(--red, var(--gold))));
  color: #0b0b0e;
  font-size: 13px;
  font-weight: 700;
  box-shadow: 0 0 14px var(--accent, var(--blue-lux, var(--red, var(--gold))));
}
.portal-bar__name {
  color: var(--accent, var(--blue-lux, var(--red, var(--gold))));
  font-weight: 700;
  letter-spacing: 0.24em;
  white-space: nowrap;
}
.portal-bar__sep {
  width: 1px;
  height: 16px;
  flex: none;
  background: var(--line);
}
.portal-bar__text {
  color: var(--ink-dim, var(--dim));
  letter-spacing: 0.12em;
  white-space: nowrap;
}
.portal-bar__arrow { font-style: normal; transition: transform .35s; }
.portal-bar:hover .portal-bar__arrow { transform: translateX(4px); }
@media (max-width: 720px) {
  .portal-bar { flex-wrap: wrap; justify-content: center; text-align: center; margin: 30px 20px 14px; padding: 13px 26px; gap: 12px; }
  .portal-bar__rule { display: none; }
  .portal-bar__text { white-space: normal; }
}