/* ============================================================
   宝马娱乐馆 · CN 中文站  共享样式 /assets/site.css
   构图：框架式导航（左竖栏 + 顶编号条 + 右色带）
   气质：夜间赛道仪表盘 × 数字娱乐大厅
   ============================================================ */

/* ---------- 01 复位 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dt, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
img, svg, video { display: block; max-width: 100%; }
table { width: 100%; border-collapse: collapse; }

/* ---------- 02 变量 ---------- */
:root {
  --deep: #0A1730;
  --steel: #12395E;
  --red: #D0112B;
  --cyan: #22E0D6;
  --violet: #7B4DFF;
  --amber: #FFB020;
  --silver: #9AA9BC;
  --white: #F3F6FA;
  --teal: #0B3B3C;
  --green: #2ED47A;
  --ink: #050B18;

  --rail: 0px;
  --band: 0px;
  --max: 1280px;
  --gap: clamp(16px, 2.4vw, 28px);
  --hard: 4px 4px 0 rgba(5, 11, 24, .92);

  --font-display: "Arial Narrow", "Helvetica Neue Condensed", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
}
@media (min-width: 1100px) {
  :root { --rail: 58px; --band: 10px; }
}

/* ---------- 03 基础排版 ---------- */
body {
  min-height: 100vh;
  padding-left: var(--rail);
  padding-right: var(--band);
  background-color: var(--deep);
  background-image:
    radial-gradient(circle at 88% -8%, rgba(123, 77, 255, .30), transparent 55%),
    radial-gradient(circle at 4% 14%, rgba(34, 224, 214, .16), transparent 42%),
    repeating-linear-gradient(90deg, rgba(154, 169, 188, .055) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(0deg, rgba(154, 169, 188, .04) 0 1px, transparent 1px 96px);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  letter-spacing: .01em;
}
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-stretch: condensed;
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: .01em;
}
h1 { font-size: clamp(30px, 4.6vw, 56px); }
h2 { font-size: clamp(24px, 3.2vw, 36px); }
h3 { font-size: clamp(19px, 2.2vw, 24px); }
h4 { font-size: clamp(16px, 1.6vw, 19px); }
:focus-visible { outline: 3px solid var(--cyan); outline-offset: 3px; }

.wrap {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding-left: clamp(14px, 3vw, 32px);
  padding-right: clamp(14px, 3vw, 32px);
}

/* ---------- 04 跳至主内容 ---------- */
.skip-link {
  position: fixed;
  top: 8px;
  left: calc(var(--rail) + 8px);
  z-index: 200;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink);
  background: var(--cyan);
  border: 2px solid var(--ink);
  transform: translateY(-160%);
  transition: transform .2s ease;
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 05 页头框架 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: linear-gradient(180deg, rgba(9, 20, 42, .98), rgba(8, 18, 38, .94));
  border-bottom: 2px solid var(--steel);
  box-shadow: 0 12px 0 -9px rgba(34, 224, 214, .22);
}

.header-rail {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  z-index: 90;
  width: var(--rail);
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 14px 0 18px;
  background: linear-gradient(180deg, #0B1B36 0%, #071127 58%, var(--teal) 100%);
  border-right: 2px solid var(--steel);
}
@media (min-width: 1100px) { .header-rail { display: flex; } }
.rail-mark {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  color: var(--ink);
  background: var(--cyan);
  padding: 4px 7px;
  box-shadow: 3px 3px 0 var(--red);
}
.rail-text {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .34em;
  color: var(--silver);
  text-transform: uppercase;
}
.rail-line {
  flex: 1;
  width: 2px;
  background: repeating-linear-gradient(180deg, var(--silver) 0 6px, transparent 6px 15px);
  opacity: .5;
}

.header-band {
  position: fixed;
  right: 0;
  top: 0;
  bottom: 0;
  z-index: 90;
  width: var(--band);
  display: none;
  background: linear-gradient(180deg,
    var(--cyan) 0 16.6%,
    var(--violet) 16.6% 33.2%,
    #22B7AE 33.2% 49.8%,
    var(--amber) 49.8% 66.4%,
    var(--red) 66.4% 83%,
    var(--green) 83% 100%);
}
@media (min-width: 1100px) { .header-band { display: block; } }

.header-inner {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 clamp(14px, 3vw, 32px);
}
.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  min-height: 66px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(154, 169, 188, .22);
}
.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.brand-badge {
  flex: none;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--ink);
  background: var(--cyan);
  padding: 5px 7px;
  border: 2px solid var(--ink);
  box-shadow: 3px 3px 0 var(--red);
}
.brand-text { display: block; min-width: 0; }
.brand-name {
  display: block;
  font-family: var(--font-display);
  font-stretch: condensed;
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
  color: var(--white);
  white-space: nowrap;
}
.brand-sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--silver);
  text-transform: uppercase;
}
.header-tools { display: flex; align-items: center; gap: 12px; }

.header-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--silver);
  border: 1px solid rgba(154, 169, 188, .35);
}
.dot {
  width: 7px;
  height: 7px;
  flex: none;
  background: var(--green);
  box-shadow: 0 0 10px var(--green);
}

.cta-collect {
  position: relative;
  flex: none;
  padding: 9px 16px;
  font-family: var(--font-display);
  font-stretch: condensed;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .04em;
  white-space: nowrap;
  color: var(--white);
  border: 2px solid var(--red);
  background: linear-gradient(120deg, rgba(208, 17, 43, .26), rgba(208, 17, 43, .07));
  box-shadow: 4px 4px 0 rgba(208, 17, 43, .35);
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, color .2s ease;
}
.cta-collect:hover {
  transform: translate(-1px, -2px);
  background: rgba(208, 17, 43, .3);
  box-shadow: 6px 6px 0 rgba(208, 17, 43, .5);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 7px;
  padding: 9px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--cyan);
  border: 2px solid var(--steel);
  background: rgba(18, 57, 94, .35);
}
.nav-toggle-bar {
  display: block;
  width: 16px;
  height: 2px;
  background: var(--cyan);
  transition: transform .22s ease, opacity .22s ease;
}
.nav-toggle[aria-expanded="true"] { color: var(--amber); border-color: var(--amber); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar { background: var(--amber); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(4px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { transform: translateY(-4px) rotate(-45deg); }

.primary-nav { display: block; }
.nav-index {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 1px;
  background: rgba(154, 169, 188, .22);
}
.nav-index li { background: #091530; }
.nav-index a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 11px 12px;
  font-size: 14.5px;
  color: var(--silver);
  border-bottom: 3px solid transparent;
  transition: color .2s ease, background .2s ease, border-color .2s ease;
}
.nav-index a:hover { color: var(--white); background: var(--steel); }
.nav-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--amber);
}
.nav-label { display: inline-block; }
.nav-index a[aria-current="page"] {
  color: var(--white);
  background: linear-gradient(180deg, rgba(208, 17, 43, .26), rgba(208, 17, 43, .02));
  border-bottom-color: var(--red);
}
.nav-index a[aria-current="page"] .nav-num { color: var(--red); }

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 3px;
  background: rgba(154, 169, 188, .16);
}
.scroll-progress > span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--violet) 55%, var(--red));
  transition: width .12s linear;
}

/* ---------- 06 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 104px);
  background: linear-gradient(180deg, #081227 0%, var(--ink) 74%);
  border-top: 3px solid var(--steel);
}
.footer-frame {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 clamp(14px, 3vw, 32px) 30px;
}
.footer-frame::before {
  content: "";
  display: block;
  height: 6px;
  margin: 0 calc(-1 * clamp(14px, 3vw, 32px)) 28px;
  background: linear-gradient(90deg,
    var(--cyan) 0 16.6%, var(--violet) 16.6% 33.2%, #22B7AE 33.2% 49.8%,
    var(--amber) 49.8% 66.4%, var(--red) 66.4% 83%, var(--green) 83% 100%);
}
.footer-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  margin-bottom: 34px;
  border: 2px solid var(--steel);
  border-left: 6px solid var(--red);
  background: linear-gradient(115deg, rgba(18, 57, 94, .55), rgba(11, 59, 60, .35));
}
.footer-cta-title {
  font-family: var(--font-display);
  font-stretch: condensed;
  font-weight: 700;
  font-size: clamp(18px, 2.1vw, 23px);
  color: var(--white);
}
.footer-cta-note {
  font-size: 14.5px;
  color: var(--silver);
}
.footer-cta-copy { min-width: 0; }

.footer-grid {
  display: grid;
  grid-template-columns: 1.05fr 1.05fr .85fr 1.3fr;
  gap: clamp(20px, 3vw, 40px);
  padding-bottom: 26px;
  border-bottom: 1px solid rgba(154, 169, 188, .22);
}
.footer-col { min-width: 0; }
.footer-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--cyan);
  text-transform: uppercase;
}
.footer-list li, .footer-zones li { margin-bottom: 8px; }
.footer-list a, .footer-zones a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 15px;
  color: rgba(243, 246, 250, .84);
  transition: color .18s ease, transform .18s ease;
}
.footer-list a:hover, .footer-zones a:hover { color: var(--cyan); transform: translateX(3px); }
.footer-num, .z-num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--silver);
}
.footer-zones li:nth-child(1) .z-num { color: var(--cyan); }
.footer-zones li:nth-child(2) .z-num { color: var(--violet); }
.footer-zones li:nth-child(3) .z-num { color: #22B7AE; }
.footer-zones li:nth-child(4) .z-num { color: var(--amber); }
.footer-zones li:nth-child(5) .z-num { color: var(--red); }
.footer-zones li:nth-child(6) .z-num { color: var(--green); }
.z-name { display: inline-block; }

.footer-meta { display: grid; gap: 0; }
.footer-meta > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px dashed rgba(154, 169, 188, .26);
}
.footer-meta dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--silver);
}
.footer-meta dd {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--amber);
}
.footer-contact li {
  margin-bottom: 8px;
  font-size: 14.5px;
  color: rgba(243, 246, 250, .84);
  word-break: break-word;
}
.footer-icp {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--silver);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-top: 20px;
}
.footer-legal {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--silver);
}
.footer-links { display: flex; flex-wrap: wrap; gap: 18px; }
.footer-links a {
  font-size: 13.5px;
  color: rgba(243, 246, 250, .82);
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}
.footer-links a:hover { color: var(--cyan); border-bottom-color: var(--cyan); }

/* ---------- 07 通用组件 ---------- */
.breadcrumbs {
  padding-top: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--silver);
}
.breadcrumbs ol { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.breadcrumbs li { display: flex; align-items: center; gap: 8px; }
.breadcrumbs li + li::before { content: "/"; color: rgba(154, 169, 188, .55); }
.breadcrumbs a:hover { color: var(--cyan); }
.breadcrumbs [aria-current="page"] { color: var(--amber); }

.section { padding: clamp(38px, 6vw, 78px) 0 0; }
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 22px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(154, 169, 188, .22);
}
.section-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--red);
}
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.divider-band {
  height: 6px;
  margin: clamp(30px, 5vw, 58px) 0;
  background: linear-gradient(90deg,
    var(--cyan) 0 16.6%, var(--violet) 16.6% 33.2%, #22B7AE 33.2% 49.8%,
    var(--amber) 49.8% 66.4%, var(--red) 66.4% 83%, var(--green) 83% 100%);
}

.grid { display: grid; gap: var(--gap); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.panel {
  padding: clamp(18px, 2.4vw, 28px);
  border: 2px solid var(--steel);
  border-left: 5px solid var(--cyan);
  background: rgba(18, 57, 94, .32);
  box-shadow: var(--hard);
}
.panel--steel { background: rgba(18, 57, 94, .5); border-left-color: var(--violet); }
.panel--teal { background: rgba(11, 59, 60, .55); border-left-color: var(--green); }
.panel--violet { background: rgba(123, 77, 255, .18); border-left-color: var(--amber); }

.data-list { display: grid; gap: 0; }
.data-list > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px dashed rgba(154, 169, 188, .28);
}
.data-list dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--silver);
}
.data-list dd {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--amber);
}
.stat-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1.1;
  color: var(--cyan);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--silver);
  border: 1px solid rgba(154, 169, 188, .45);
}
.tag--cyan { color: var(--cyan); border-color: var(--cyan); }
.tag--violet { color: var(--violet); border-color: var(--violet); }
.tag--amber { color: var(--amber); border-color: var(--amber); }
.tag--red { color: var(--red); border-color: var(--red); }
.tag--green { color: var(--green); border-color: var(--green); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  font-family: var(--font-display);
  font-stretch: condensed;
  font-weight: 700;
  font-size: 14.5px;
  letter-spacing: .04em;
  color: var(--white);
  border: 2px solid var(--silver);
  background: transparent;
  transition: transform .2s ease, background .2s ease, border-color .2s ease, box-shadow .2s ease, color .2s ease;
}
.btn:hover { background: var(--steel); border-color: var(--cyan); transform: translateY(-2px); }
.btn--solid {
  background: var(--red);
  border-color: var(--red);
  box-shadow: 4px 4px 0 rgba(34, 224, 214, .35);
}
.btn--solid:hover {
  background: #E3132F;
  border-color: #E3132F;
  box-shadow: 6px 6px 0 rgba(34, 224, 214, .5);
}
.btn--ghost { color: var(--cyan); border-color: var(--cyan); }
.btn--ghost:hover { color: var(--white); background: rgba(34, 224, 214, .16); }

.prose { max-width: 38em; }
.prose h2 { margin: 1.5em 0 .55em; }
.prose h3 { margin: 1.3em 0 .5em; }
.prose p { margin-bottom: 1.1em; color: rgba(243, 246, 250, .88); }
.prose ul { margin-bottom: 1.2em; }
.prose ul li { position: relative; margin-bottom: .5em; padding-left: 22px; color: rgba(243, 246, 250, .88); }
.prose ul li::before {
  content: "\25B8";
  position: absolute;
  left: 0;
  color: var(--cyan);
  font-family: var(--font-mono);
}
.prose strong { color: var(--white); }
.prose a { color: var(--cyan); border-bottom: 1px solid var(--cyan); }

.media-frame {
  position: relative;
  overflow: hidden;
  border: 2px solid var(--steel);
  background: linear-gradient(135deg, #0E2745 0%, #071127 100%);
  box-shadow: var(--hard);
}
.media-frame img,
.media-frame video { width: 100%; height: 100%; object-fit: cover; }
.media-frame figcaption {
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--silver);
  border-top: 1px solid rgba(154, 169, 188, .24);
}
.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame__glow {
  position: absolute;
  inset: auto -20% -45% 30%;
  height: 70%;
  background: radial-gradient(closest-side, rgba(34, 224, 214, .35), transparent);
  pointer-events: none;
}

/* ---------- 08 显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .3s ease, transform .3s ease;
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 09 响应式 ---------- */
@media (max-width: 1080px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 900px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .header-status { display: none; }
}
@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }
  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    background: #071228;
    border-bottom: 2px solid var(--steel);
    box-shadow: 0 26px 46px rgba(0, 0, 0, .55);
  }
  .primary-nav[data-open] { display: block; animation: navDrop .24s ease-out both; }
  .nav-index { grid-template-columns: 1fr; gap: 0; background: transparent; }
  .nav-index li { background: transparent; border-bottom: 1px solid rgba(154, 169, 188, .16); }
  .nav-index a { padding: 14px 16px; font-size: 16px; border-bottom: none; }
  .nav-index a[aria-current="page"] {
    background: linear-gradient(90deg, rgba(208, 17, 43, .28), transparent);
    box-shadow: inset 4px 0 0 var(--red);
  }
  .brand-sub { display: none; }
}
@keyframes navDrop {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: none; }
}
@media (max-width: 600px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .brand-name { font-size: 16px; }
  .brand-badge { font-size: 11px; padding: 4px 6px; }
  .cta-collect { font-size: 12px; padding: 7px 10px; }
  .nav-toggle { padding: 7px 10px; font-size: 11px; }
  .media-frame--wide { aspect-ratio: 16 / 9; }
  .footer-base { flex-direction: column; align-items: flex-start; }
}

/* ---------- 10 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .skip-link { transition: none; }
}