/* ==========================================================================
   XBET国际入口 — 共享样式表 /assets/site.css
   夜间球场泛光灯 + 数据流仪表盘：深墨蓝底、电光青交互、霓虹橙落点
   ========================================================================== */

/* ---------- 1. 重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  background-color: #0A1428;
}

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, blockquote, dl, dd, hr { margin: 0; }

ul, ol { padding: 0; list-style: none; }

img, svg, video, canvas { display: block; max-width: 100%; }

button { font: inherit; color: inherit; background: none; border: 0; }

a { color: inherit; text-decoration: none; }

table { border-collapse: collapse; width: 100%; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- 2. 设计变量 ---------- */
:root {
  --ink-900: #0A1428;
  --ink-800: #101F3C;
  --ink-700: #16294D;

  --cyan: #00E5FF;
  --orange: #FF6B1A;
  --amber: #FFC940;
  --wine: #8E1D3C;
  --indigo: #3B2A6B;

  --g300: #B0B8C4;
  --g500: #6C7688;
  --white: #FFFFFF;

  --line: rgba(176, 184, 196, 0.18);
  --line-strong: rgba(0, 229, 255, 0.38);

  --r-sm: 12px;
  --r-md: 20px;
  --r-lg: 30px;
  --r-pill: 999px;

  --pad: clamp(18px, 4vw, 40px);
  --gap: clamp(16px, 2.4vw, 30px);
  --maxw: 1240px;

  --font-head: 'Oswald', 'Noto Sans SC', 'PingFang SC', sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Roboto Mono', ui-monospace, monospace;
}

/* ---------- 3. 页面底色与光晕 ---------- */
body {
  min-height: 100vh;
  overflow-x: hidden;
  font-family: var(--font-body);
  font-size: clamp(16px, 0.5vw + 14px, 18px);
  line-height: 1.75;
  letter-spacing: 0.01em;
  color: var(--g300);
  background-color: var(--ink-900);
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    radial-gradient(1020px 620px at 82% -10%, rgba(0, 229, 255, 0.16), transparent 62%),
    radial-gradient(840px 520px at 2% 4%, rgba(255, 107, 26, 0.13), transparent 60%),
    radial-gradient(900px 700px at 50% 118%, rgba(59, 42, 107, 0.42), transparent 68%);
}

/* ---------- 4. 布局容器 ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.stack { display: grid; gap: var(--gap); }
.stack--sm { gap: 12px; }
.center { text-align: center; }
.muted { color: var(--g500); }

.hr-line {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
}

/* ---------- 5. 跳过导航 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 50%;
  z-index: 120;
  transform: translate(-50%, -180%);
  padding: 12px 24px;
  border-radius: var(--r-pill);
  background: var(--cyan);
  color: #05121F;
  font-weight: 700;
  font-size: 0.9rem;
  transition: transform 0.25s ease;
}
.skip-link:focus { transform: translate(-50%, 0); }

/* ---------- 6. 共享头部：居中刊头 ---------- */
.masthead {
  position: relative;
  z-index: 40;
  background: linear-gradient(180deg, rgba(10, 20, 40, 0.97), rgba(16, 31, 60, 0.9));
  border-bottom: 1px solid var(--line);
  padding-bottom: clamp(14px, 2vw, 22px);
}

.masthead::after {
  content: "";
  position: absolute;
  inset: auto 0 -1px 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 229, 255, 0.6) 30%, rgba(255, 107, 26, 0.6) 70%, transparent);
  opacity: 0.55;
}

.masthead__bar {
  border-bottom: 1px solid var(--line);
  background: rgba(0, 229, 255, 0.045);
}

.masthead__bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-block: 9px;
}

.masthead__ticker {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.masthead__core {
  position: relative;
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(18px, 2.6vw, 28px) var(--pad) 0;
  text-align: center;
}

.masthead__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--g500);
}

.masthead__brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.2em;
  margin-top: 8px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(2rem, 5.2vw, 3.3rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--white);
}

.masthead__brand-mark { color: var(--white); }

.masthead__brand-text {
  position: relative;
  color: var(--cyan);
}

.masthead__brand-text::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.06em;
  height: 3px;
  background: var(--orange);
  transform: scaleX(0.28);
  transform-origin: left center;
  transition: transform 0.35s ease, background 0.35s ease;
}

.masthead__brand:hover .masthead__brand-text::after,
.masthead__brand:focus-visible .masthead__brand-text::after {
  transform: scaleX(1);
  background: var(--cyan);
}

.masthead__tagline {
  margin-top: 12px;
  font-size: 0.86rem;
  letter-spacing: 0.5em;
  text-indent: 0.5em;
  color: var(--g300);
}

.masthead__actions {
  display: none;
  justify-content: center;
  margin-top: clamp(12px, 2vw, 18px);
}

/* 移动导航开关 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 22px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: var(--ink-800);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  cursor: pointer;
  transition: border-color 0.24s ease, background 0.24s ease, color 0.24s ease;
}
.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}
.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 栏目导航 */
.site-nav {
  width: 100%;
  padding-inline: var(--pad);
  margin-top: clamp(14px, 2.2vw, 22px);
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: clamp(4px, 1vw, 12px);
}

.site-nav__list a {
  position: relative;
  display: inline-block;
  padding: 9px 18px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font-size: 0.94rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--g300);
  transition: color 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}

.site-nav__list a::after {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 3px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.28s ease, background 0.28s ease;
}

.site-nav__list a:hover,
.site-nav__list a:focus-visible { color: var(--white); }

.site-nav__list a:hover::after,
.site-nav__list a:focus-visible::after {
  transform: scaleX(1);
  background: var(--orange);
}

.site-nav__list a[aria-current="page"] {
  color: #05121F;
  font-weight: 700;
  background: linear-gradient(120deg, var(--cyan), #6BF4FF);
  border-color: var(--cyan);
}
.site-nav__list a[aria-current="page"]::after { display: none; }

/* ---------- 7. 共享页脚 ---------- */
.site-foot {
  position: relative;
  margin-top: clamp(56px, 9vw, 120px);
  background: linear-gradient(180deg, rgba(16, 31, 60, 0.6), #070F1E 88%);
  border-top: 1px solid var(--line);
}

.site-foot__beam {
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--cyan) 16%, var(--orange) 52%, var(--wine) 78%, transparent);
  opacity: 0.85;
}

.site-foot__inner {
  display: grid;
  grid-template-columns: 1.2fr 0.85fr 1.15fr;
  gap: clamp(26px, 4vw, 56px);
  padding-block: clamp(40px, 6vw, 72px) clamp(28px, 3.5vw, 44px);
}

.site-foot__wordmark {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--white);
}
.site-foot__wordmark span {
  display: block;
  margin-top: 0.55em;
  font-family: var(--font-mono);
  font-size: 0.44em;
  font-weight: 400;
  letter-spacing: 0.36em;
  color: var(--cyan);
}

.site-foot__tagline {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.36em;
  color: var(--amber);
}

.site-foot__blurb {
  margin-top: 14px;
  max-width: 34ch;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--g300);
}

.site-foot__heading {
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--cyan);
}

.foot-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 20px;
}
.foot-links a {
  position: relative;
  display: inline-block;
  font-size: 0.92rem;
  color: var(--g300);
  transition: color 0.22s ease;
}
.foot-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.26s ease, background 0.26s ease;
}
.foot-links a:hover,
.foot-links a:focus-visible { color: var(--white); }
.foot-links a:hover::after,
.foot-links a:focus-visible::after { transform: scaleX(1); background: var(--orange); }

.contact-list { display: grid; gap: 14px; }

.contact-list__key {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--g500);
}

.contact-list__value {
  display: block;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--white);
}

.copy-chip {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  max-width: 100%;
  padding: 8px 15px;
  border: 1px dashed rgba(0, 229, 255, 0.34);
  border-radius: var(--r-pill);
  background: rgba(0, 229, 255, 0.05);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  text-align: left;
  cursor: pointer;
  transition: border-color 0.24s ease, background 0.24s ease, color 0.24s ease;
}
.copy-chip:hover { border-color: var(--cyan); background: rgba(0, 229, 255, 0.12); }
.copy-chip.is-copied { border-color: var(--orange); background: rgba(255, 107, 26, 0.16); }
.copy-chip__value { word-break: break-all; }
.copy-chip__hint {
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  color: var(--g500);
  transition: color 0.24s ease;
}
.copy-chip.is-copied .copy-chip__hint { color: var(--amber); }

.site-foot__note {
  margin-top: 18px;
  font-size: 0.8rem;
  line-height: 1.75;
  color: var(--g500);
}

.site-foot__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 26px;
  padding-block: 20px 30px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--g500);
}
.site-foot__copy { color: var(--g300); }
.site-foot__icp { color: var(--g500); }

/* ---------- 8. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55em;
  padding: 0.78em 1.55em;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  background: rgba(0, 229, 255, 0.07);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: background 0.24s ease, border-color 0.24s ease, color 0.24s ease,
              box-shadow 0.24s ease, transform 0.24s ease;
}
.btn:hover,
.btn:focus-visible {
  border-color: var(--cyan);
  background: rgba(0, 229, 255, 0.16);
  box-shadow: 0 0 0 1px rgba(0, 229, 255, 0.3), 0 12px 32px -20px rgba(0, 229, 255, 0.95);
}

.btn--cta {
  background: linear-gradient(115deg, var(--orange), #FF9130);
  border-color: transparent;
  color: #1A0A02;
  font-weight: 800;
}
.btn--cta:hover,
.btn--cta:focus-visible {
  background: linear-gradient(115deg, #FF8A3D, var(--orange));
  box-shadow: 0 14px 36px -18px rgba(255, 107, 26, 0.95);
}

.btn--ghost { background: transparent; }
.btn--ghost:hover { background: rgba(0, 229, 255, 0.1); }

.btn--sm { padding: 0.5em 1.15em; font-size: 0.78rem; letter-spacing: 0.12em; }
.btn--block { width: 100%; }

/* ---------- 9. 排版层级 ---------- */
.t-display,
.t-h1,
.t-h2,
.t-h3 { font-family: var(--font-head); color: var(--white); }

.t-display {
  font-size: clamp(2.6rem, 9vw, 7rem);
  font-weight: 700;
  line-height: 0.94;
  letter-spacing: -0.015em;
  text-wrap: balance;
}
.t-h1 {
  font-size: clamp(2rem, 5.6vw, 4.2rem);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.t-h2 {
  font-size: clamp(1.5rem, 3.4vw, 2.5rem);
  font-weight: 600;
  line-height: 1.12;
  text-wrap: balance;
}
.t-h3 {
  font-size: clamp(1.15rem, 1.8vw, 1.5rem);
  font-weight: 600;
  line-height: 1.28;
  letter-spacing: 0.01em;
}
.t-lead {
  font-size: clamp(1rem, 0.5vw + 0.9rem, 1.18rem);
  line-height: 1.8;
  color: var(--g300);
}
.t-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--cyan);
}
.t-mono {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.06em;
  color: var(--g300);
}

.accent-cyan { color: var(--cyan); }
.accent-orange { color: var(--orange); }
.accent-amber { color: var(--amber); }

/* ---------- 10. 面包屑 ---------- */
.breadcrumb { padding-block: 20px 0; }
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45em;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
}
.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 0.45em;
  color: var(--g500);
}
.breadcrumb li + li::before {
  content: "/";
  color: var(--g500);
  opacity: 0.65;
}
.breadcrumb a { color: var(--g300); transition: color 0.2s ease; }
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb [aria-current="page"] { color: var(--white); }

/* ---------- 11. 正文容器 ---------- */
.prose {
  max-width: 72ch;
  font-size: clamp(1rem, 0.3vw + 0.94rem, 1.06rem);
  line-height: 1.85;
  color: var(--g300);
}
.prose > * + * { margin-top: 1.1em; }
.prose h2 {
  margin-top: 2em;
  font-family: var(--font-head);
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  font-weight: 600;
  line-height: 1.2;
  color: var(--white);
}
.prose h3 {
  margin-top: 1.6em;
  font-family: var(--font-head);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--white);
}
.prose a {
  color: var(--cyan);
  text-decoration: underline;
  text-decoration-color: rgba(0, 229, 255, 0.42);
  text-underline-offset: 4px;
  transition: color 0.22s ease, text-decoration-color 0.22s ease;
}
.prose a:hover { color: var(--orange); text-decoration-color: var(--orange); }
.prose strong { color: var(--white); }
.prose ul { display: grid; gap: 0.65em; }
.prose ul li { position: relative; padding-left: 1.4em; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
}
.prose ol { display: grid; gap: 0.65em; padding-left: 1.5em; list-style: decimal; }
.prose ol li::marker { font-family: var(--font-mono); color: var(--amber); }
.prose blockquote {
  padding-left: 1.2em;
  border-left: 2px solid var(--orange);
  color: var(--white);
}
.prose code {
  padding: 0.15em 0.45em;
  border-radius: 6px;
  background: rgba(0, 229, 255, 0.08);
  font-family: var(--font-mono);
  font-size: 0.88em;
  color: var(--cyan);
}

/* ---------- 12. 分区节奏 ---------- */
.section { padding-block: clamp(48px, 7vw, 96px); }
.section--tight { padding-block: clamp(28px, 4vw, 52px); }
.section--band {
  background: linear-gradient(180deg, rgba(16, 31, 60, 0.72), rgba(10, 20, 40, 0.35));
  border-block: 1px solid var(--line);
}
.section--wine {
  background: linear-gradient(135deg, rgba(142, 29, 60, 0.36), rgba(10, 20, 40, 0.12));
  border-block: 1px solid rgba(142, 29, 60, 0.42);
}
.section--indigo {
  background: linear-gradient(135deg, rgba(59, 42, 107, 0.5), rgba(10, 20, 40, 0.12));
  border-block: 1px solid rgba(59, 42, 107, 0.58);
}

/* ---------- 13. 网格 ---------- */
.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)); }
.grid--asym { grid-template-columns: minmax(0, 1.28fr) minmax(0, 0.82fr); }

/* ---------- 14. 面板与磁贴 ---------- */
.panel {
  padding: clamp(20px, 3vw, 34px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: rgba(16, 31, 60, 0.6);
  transition: border-color 0.3s ease, background 0.3s ease;
}
.panel:hover {
  border-color: rgba(0, 229, 255, 0.42);
  background: rgba(16, 31, 60, 0.82);
}

.tile {
  position: relative;
  display: block;
  overflow: hidden;
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(150deg, rgba(16, 31, 60, 0.92), rgba(10, 20, 40, 0.7));
  transition: transform 0.32s ease, border-color 0.32s ease, box-shadow 0.32s ease;
}
.tile::after {
  content: "";
  position: absolute;
  right: -30%;
  bottom: -55%;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.24), transparent 68%);
  opacity: 0.45;
  pointer-events: none;
  transition: opacity 0.32s ease;
}
.tile:hover,
.tile:focus-visible {
  transform: translateY(-4px);
  border-color: rgba(0, 229, 255, 0.5);
  box-shadow: 0 30px 62px -42px rgba(0, 229, 255, 0.9);
}
.tile:hover::after,
.tile:focus-visible::after { opacity: 1; }
.tile--accent::after { background: radial-gradient(circle, rgba(255, 107, 26, 0.3), transparent 68%); }
.tile--accent:hover { border-color: rgba(255, 107, 26, 0.55); }

.tile__index {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  color: var(--amber);
}
.tile__title {
  margin-top: 12px;
  font-family: var(--font-head);
  font-size: clamp(1.2rem, 2.2vw, 1.7rem);
  font-weight: 600;
  line-height: 1.2;
  color: var(--white);
}
.tile__text {
  margin-top: 10px;
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--g300);
}

/* ---------- 15. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.3em 0.85em;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  background: rgba(176, 184, 196, 0.06);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--g300);
}
.tag--cyan { color: var(--cyan); border-color: rgba(0, 229, 255, 0.4); background: rgba(0, 229, 255, 0.1); }
.tag--orange { color: var(--orange); border-color: rgba(255, 107, 26, 0.44); background: rgba(255, 107, 26, 0.1); }
.tag--amber { color: var(--amber); border-color: rgba(255, 201, 64, 0.42); background: rgba(255, 201, 64, 0.1); }

/* ---------- 16. 横向滑动带 ---------- */
.rail {
  display: flex;
  gap: var(--gap);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  padding: 4px var(--pad) 18px;
  margin-inline: calc(-1 * var(--pad));
  scrollbar-width: thin;
}
.rail > * {
  flex: 0 0 min(320px, 78vw);
  scroll-snap-align: start;
}
.rail::-webkit-scrollbar { height: 6px; }
.rail::-webkit-scrollbar-track { background: rgba(108, 118, 136, 0.14); border-radius: 99px; }
.rail::-webkit-scrollbar-thumb { background: rgba(0, 229, 255, 0.34); border-radius: 99px; }

/* ---------- 17. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background-color: #0D1B33;
  background-image: linear-gradient(140deg, rgba(0, 229, 255, 0.16), rgba(59, 42, 107, 0.4) 52%, rgba(255, 107, 26, 0.16));
}
.media-frame > img,
.media-frame > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(180deg, transparent 46%, rgba(6, 13, 26, 0.78));
  pointer-events: none;
}
.media-frame__caption {
  position: absolute;
  left: clamp(14px, 2vw, 24px);
  right: clamp(14px, 2vw, 24px);
  bottom: clamp(14px, 2vw, 24px);
  z-index: 2;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--white);
  text-shadow: 0 2px 18px rgba(4, 10, 22, 0.9);
}
.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x5 { aspect-ratio: 4 / 5; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--21x9 { aspect-ratio: 21 / 9; }

/* ---------- 18. 滚动进度与显现 ---------- */
.scroll-meter {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  z-index: 60;
  pointer-events: none;
  background: rgba(10, 20, 40, 0.4);
}
.scroll-meter__bar {
  display: block;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--cyan), var(--orange) 62%, var(--amber));
}

[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
[data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 19. 响应式 ---------- */
@media (max-width: 1080px) {
  .site-foot__inner { grid-template-columns: 1fr 1fr; }
  .site-foot__contact { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .grid--2,
  .grid--3,
  .grid--4,
  .grid--asym { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 860px) {
  .masthead__actions { display: flex; }

  .site-nav {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    margin-top: 12px;
    transition: max-height 0.42s ease, opacity 0.3s ease;
  }
  .site-nav[data-open] {
    max-height: 300px;
    opacity: 1;
  }

  .site-nav__list {
    flex-wrap: nowrap;
    justify-content: flex-start;
    gap: 8px;
    overflow-x: auto;
    padding: 10px 2px 12px;
    scroll-snap-type: x proximity;
    scrollbar-width: none;
  }
  .site-nav__list::-webkit-scrollbar { display: none; }
  .site-nav__list li { flex: 0 0 auto; scroll-snap-align: start; }
  .site-nav__list a { white-space: nowrap; padding: 10px 16px; }
  .site-nav__list a::after { display: none; }
}

@media (max-width: 720px) {
  .site-foot__inner { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .site-foot__contact { grid-column: auto; }
  .foot-links { grid-template-columns: minmax(0, 1fr); }
  .site-foot__legal { flex-direction: column; align-items: flex-start; }
  .masthead__ticker { font-size: 0.62rem; letter-spacing: 0.18em; }
}

@media (max-width: 420px) {
  .masthead__tagline { letter-spacing: 0.36em; text-indent: 0.36em; }
  .btn--sm { padding: 0.46em 0.9em; font-size: 0.72rem; }
  .copy-chip { font-size: 0.76rem; padding: 7px 12px; }
}

/* ---------- 20. 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .tile:hover { transform: none; }
}