/* ====================================================
   KOK中欧 · 冠军数据舱 全站共享样式
   路径：/assets/site.css
   职责：reset、变量、中文排版、头部、页脚、通用组件
   ==================================================== */

/* ---------- 变量 ---------- */
:root {
  --font-display: 'DIN Condensed', 'Archivo Black', 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-title: 'Oswald', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  --c-bg: #0A0A0A;
  --c-surface: #FFFFFF;
  --c-brand: #1B3A8C;
  --c-brand-light: #2A56C8;
  --c-gold: #D4AF37;
  --c-gold-bright: #F8D66D;
  --c-red: #E63946;
  --c-green: #2A9D8F;
  --c-silver: #2E2E2E;
  --c-mist: #F1F1F1;
  --c-night-deep: #0D1B2A;
  --c-night: #1B263B;

  --c-ink: #0A0A0A;
  --c-ink-soft: rgba(255, 255, 255, 0.86);
  --c-line: rgba(255, 255, 255, 0.09);
  --c-line-dark: rgba(10, 10, 10, 0.12);

  --grad-gold: linear-gradient(135deg, #D4AF37, #F8D66D);
  --grad-night: linear-gradient(180deg, #0D1B2A, #1B263B);

  --container: 1200px;
  --radius-soft: 0.75rem;
  --radius-pill: 999px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --duration: 300ms;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 5rem;
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--c-ink-soft);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main {
  display: block;
}

img,
picture,
svg,
video {
  display: block;
  max-width: 100%;
  height: auto;
}

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

ul[class],
ol[class],
menu[class] {
  list-style: none;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: 0;
  cursor: pointer;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-title);
  font-weight: 700;
  line-height: 1.2;
  overflow-wrap: break-word;
}

p {
  overflow-wrap: break-word;
}

main ul:not([class]),
main ol:not([class]) {
  padding-left: 1.3rem;
  margin: 0.75rem 0;
}

main li:not([class]) {
  margin-bottom: 0.4rem;
}

hr {
  border: 0;
  border-top: 1px solid var(--c-line);
  margin: 2.5rem 0;
}

::selection {
  background: var(--c-gold);
  color: var(--c-ink);
}

/* ---------- 工具类 ---------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.display-xl {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(3.5rem, 12vw, 8rem);
  line-height: 0.92;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  color: var(--c-surface);
}

.gold-gradient-text {
  background-image: var(--grad-gold);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.8rem 1.6rem;
  border-radius: var(--radius-soft);
  font-family: var(--font-title);
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: nowrap;
  transition: transform var(--duration) var(--ease), box-shadow var(--duration) var(--ease), background-color var(--duration) var(--ease), border-color var(--duration) var(--ease), color var(--duration) var(--ease);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn--primary {
  background-color: var(--c-brand);
  color: #FFFFFF;
  box-shadow: 0 4px 16px rgba(27, 58, 140, 0.32);
}

.btn--primary:hover {
  background-color: var(--c-brand-light);
  box-shadow: 0 10px 28px rgba(27, 58, 140, 0.42);
}

.btn--gold {
  background-image: var(--grad-gold);
  color: var(--c-ink);
  box-shadow: 0 4px 18px rgba(212, 175, 55, 0.3);
}

.btn--gold:hover {
  box-shadow: 0 12px 32px rgba(212, 175, 55, 0.4);
}

.btn--ghost {
  border: 1px solid var(--c-line);
  color: var(--c-ink-soft);
  background: transparent;
}

.btn--ghost:hover {
  border-color: var(--c-gold);
  color: var(--c-gold-bright);
}

.btn--light {
  background-color: var(--c-surface);
  color: var(--c-ink);
}

.btn--light:hover {
  background-color: var(--c-mist);
}

.btn--sm {
  padding: 0.55rem 1.1rem;
  font-size: 0.85rem;
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.32rem 0.72rem;
  border-radius: var(--radius-pill);
  background: var(--c-silver);
  color: var(--c-ink-soft);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  line-height: 1.2;
}

.tag--live {
  background: var(--c-red);
  color: var(--c-ink);
}

.tag--live::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-ink);
  animation: tag-pulse 1.4s ease-in-out infinite;
}

.tag--gold {
  background-image: var(--grad-gold);
  color: var(--c-ink);
}

.tag--green {
  background: var(--c-green);
  color: #FFFFFF;
}

@keyframes tag-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.25; }
}

/* ---------- 跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 300;
  padding: 0.7rem 1.25rem;
  background: var(--c-brand);
  color: #FFFFFF;
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: var(--radius-soft);
  transform: translateY(-320%);
  transition: transform var(--duration) var(--ease);
  pointer-events: auto;
}

.skip-link:focus-visible {
  transform: translateY(0);
}

/* ---------- 固定悬浮头部 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0.75rem 1rem 0;
  pointer-events: none;
}

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background-image: var(--grad-gold);
  z-index: 150;
  pointer-events: none;
}

.nav-capsule {
  position: relative;
  max-width: var(--container);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.45rem 0.55rem 0.45rem 0.9rem;
  background: rgba(10, 10, 10, 0.86);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-pill);
  box-shadow: inset 0 1px 0 rgba(248, 214, 109, 0.22), 0 14px 44px rgba(0, 0, 0, 0.5);
  pointer-events: auto;
  transition: background var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}

.site-header[data-scrolled="true"] .nav-capsule {
  background: rgba(8, 8, 8, 0.94);
  box-shadow: inset 0 1px 0 rgba(248, 214, 109, 0.18), 0 10px 30px rgba(0, 0, 0, 0.6);
}

/* ---------- 品牌 ---------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
  white-space: nowrap;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.6rem;
  height: 2.6rem;
  background-image: var(--grad-gold);
  color: var(--c-ink);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.05rem;
  letter-spacing: 0.05em;
  border-radius: 4px;
  clip-path: polygon(0 0, 100% 0, 100% 74%, 72% 100%, 0 100%);
  transition: transform var(--duration) var(--ease);
}

.brand:hover .brand-mark {
  transform: rotate(-4deg);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-name {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 1.12rem;
  color: var(--c-surface);
  letter-spacing: 0.08em;
}

.brand-sub {
  font-size: 0.62rem;
  font-weight: 700;
  color: var(--c-gold-bright);
  letter-spacing: 0.3em;
  text-transform: uppercase;
}

/* ---------- 头部导航 ---------- */
.nav-links {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  margin-left: 0.25rem;
}

.nav-links a {
  position: relative;
  display: inline-block;
  padding: 0.55rem 0.8rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.7);
  border-radius: var(--radius-pill);
  transition: color var(--duration) var(--ease), background var(--duration) var(--ease);
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0.1rem;
  width: 0;
  height: 2px;
  background-image: var(--grad-gold);
  transform: translateX(-50%);
  transition: width var(--duration) var(--ease);
}

.nav-links a:hover {
  color: #FFFFFF;
  background: rgba(255, 255, 255, 0.06);
}

.nav-links a[aria-current="page"] {
  color: var(--c-gold-bright);
}

.nav-links a[aria-current="page"]::after {
  width: 50%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-left: auto;
}

.btn-navi {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1.05rem;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 0.85rem;
  line-height: 1;
  white-space: nowrap;
  transition: background var(--duration) var(--ease), color var(--duration) var(--ease), border-color var(--duration) var(--ease), transform var(--duration) var(--ease);
}

.btn-navi--primary {
  background: var(--c-brand);
  color: #FFFFFF;
}

.btn-navi--primary:hover {
  background: var(--c-brand-light);
  transform: translateY(-1px);
}

.btn-navi--ghost {
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: rgba(255, 255, 255, 0.8);
}

.btn-navi--ghost:hover {
  border-color: var(--c-gold);
  color: var(--c-gold-bright);
}

.nav-toggle {
  display: none;
  position: relative;
  width: 2.7rem;
  height: 2.7rem;
  flex-shrink: 0;
  border: 1px solid var(--c-line);
  border-radius: 50%;
  background: var(--c-silver);
  z-index: 2;
}

.nav-toggle-bar {
  display: block;
  width: 1.05rem;
  height: 2px;
  margin: 3.5px auto;
  background: #FFFFFF;
  border-radius: 2px;
  transition: transform var(--duration) var(--ease), opacity var(--duration) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(5.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-5.5px) rotate(-45deg);
}

/* ---------- 移动端导航 ---------- */
@media (max-width: 920px) {
  html[data-js="enabled"] .nav-links {
    position: absolute;
    top: calc(100% + 0.6rem);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
    margin-left: 0;
    padding: 0.75rem;
    background: rgba(9, 9, 9, 0.97);
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
    border: 1px solid var(--c-line);
    border-radius: 1.25rem;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.7);
    max-height: calc(100vh - 7rem);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity var(--duration) var(--ease), transform var(--duration) var(--ease), visibility var(--duration);
  }

  html[data-js="enabled"] .nav-links[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  html[data-js="enabled"] .nav-links a {
    padding: 0.9rem 1.1rem;
    border-radius: 0.75rem;
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.95rem;
  }

  html[data-js="enabled"] .nav-links a::after {
    display: none;
  }

  html[data-js="enabled"] .nav-links a:hover {
    background: rgba(255, 255, 255, 0.06);
    color: #FFFFFF;
  }

  html[data-js="enabled"] .nav-links a[aria-current="page"] {
    background: rgba(27, 58, 140, 0.4);
    color: var(--c-gold-bright);
  }

  html[data-js="enabled"] .nav-toggle {
    display: block;
  }
}

@media (max-width: 420px) {
  .brand-sub {
    display: none;
  }

  .btn-navi {
    padding: 0.42rem 0.8rem;
    font-size: 0.78rem;
  }

  .nav-capsule {
    gap: 0.5rem;
    padding-left: 0.6rem;
  }

  .nav-actions {
    gap: 0.35rem;
  }
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--grad-night);
  color: rgba(255, 255, 255, 0.7);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background-image: var(--grad-gold);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 2rem 1.5rem;
  padding: 4rem 0 3rem;
}

.footer-brand-col {
  grid-column: span 4;
}

.footer-col {
  grid-column: span 2;
}

.footer-contact-col {
  grid-column: span 2;
}

.brand--footer .brand-mark {
  width: 3rem;
  height: 3rem;
  font-size: 1.2rem;
}

.footer-trust {
  margin-top: 1.25rem;
  max-width: 36ch;
  font-size: 0.88rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.62);
}

.footer-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.footer-heading {
  font-family: var(--font-title);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-gold-bright);
  margin-bottom: 1.2rem;
  padding-bottom: 0.6rem;
  position: relative;
}

.footer-heading::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 1.75rem;
  height: 2px;
  background-image: var(--grad-gold);
}

.footer-list li + li {
  margin-top: 0.65rem;
}

.footer-list a,
.footer-contact-list a {
  color: rgba(255, 255, 255, 0.65);
  font-size: 0.9rem;
  transition: color var(--duration) var(--ease), padding-left var(--duration) var(--ease);
}

.footer-list a:hover,
.footer-contact-list a:hover {
  color: var(--c-gold-bright);
  padding-left: 0.3rem;
}

.footer-contact-list {
  display: grid;
  gap: 0.7rem;
}

.footer-contact-list li {
  display: grid;
  gap: 0.15rem;
}

.footer-contact-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.38);
}

.footer-contact-list li > span:last-child,
.footer-contact-list li > a:last-child {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.88rem;
  word-break: break-all;
}

.footer-service {
  margin-top: 1.25rem;
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.4);
  border-left: 2px solid rgba(212, 175, 55, 0.5);
  padding-left: 0.75rem;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 1.1rem 0;
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.42);
}

@media (max-width: 960px) {
  .footer-grid {
    grid-template-columns: repeat(6, 1fr);
    gap: 2rem 1.25rem;
  }

  .footer-brand-col,
  .footer-contact-col {
    grid-column: span 6;
  }

  .footer-col {
    grid-column: span 2;
  }
}

@media (max-width: 600px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-brand-col,
  .footer-col,
  .footer-contact-col {
    grid-column: span 1;
  }

  .footer-bottom-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem 0.75rem;
  font-size: 0.84rem;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 1.25rem;
}

.breadcrumb a {
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--duration) var(--ease);
}

.breadcrumb a:hover {
  color: var(--c-gold-bright);
}

.breadcrumb-sep {
  color: rgba(255, 255, 255, 0.3);
}

.breadcrumb [aria-current="page"] {
  color: var(--c-gold-bright);
  font-weight: 700;
}

/* ---------- 首页首屏 ---------- */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  padding: clamp(7rem, 16vh, 10.5rem) 0 4rem;
  background: var(--grad-night);
  overflow: hidden;
}

.grid-lines {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, #000000 30%, #000000 70%, transparent 100%);
  mask-image: linear-gradient(180deg, transparent 0%, #000000 30%, #000000 70%, transparent 100%);
  pointer-events: none;
}

/* ---------- 内页头图 ---------- */
.page-hero {
  position: relative;
  padding: clamp(7.5rem, 14vh, 10rem) 0 4.5rem;
  background: var(--grad-night);
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  right: -8%;
  top: -25%;
  width: 45%;
  height: 150%;
  background: repeating-linear-gradient(135deg, transparent 0 14px, rgba(255, 255, 255, 0.035) 14px 15px);
  transform: skewX(-8deg);
  pointer-events: none;
}

.page-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--c-gold) 0%, transparent 60%);
  opacity: 0.5;
}

.page-hero .page-kicker {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--c-gold-bright);
  margin-bottom: 1rem;
}

.page-hero .page-kicker::before {
  content: "";
  width: 2rem;
  height: 2px;
  background-image: var(--grad-gold);
}

.page-title {
  position: relative;
  z-index: 1;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.5rem, 8vw, 5rem);
  line-height: 0.98;
  text-transform: uppercase;
  color: var(--c-surface);
  letter-spacing: 0.01em;
}

/* ---------- 正文容器 ---------- */
.content-wrap {
  padding: clamp(6.5rem, 12vh, 8.5rem) 0 4.5rem;
  background: var(--c-mist);
  color: var(--c-ink);
  min-height: 65vh;
}

.content-wrap p {
  color: rgba(10, 10, 10, 0.72);
}

.content-panel {
  background: var(--c-surface);
  border: 1px solid rgba(10, 10, 10, 0.05);
  border-radius: var(--radius-soft);
  box-shadow: 0 6px 28px rgba(0, 0, 0, 0.06);
  padding: clamp(1.5rem, 4vw, 3rem);
}

.content-panel h1,
.content-panel h2,
.content-panel h3 {
  margin-bottom: 0.8rem;
  color: var(--c-ink);
}

.content-panel p {
  margin-bottom: 1rem;
  color: rgba(10, 10, 10, 0.72);
}

/* ---------- 章节 ---------- */
.section {
  padding: var(--space-8) 0;
  position: relative;
}

.section--dark {
  background: var(--c-bg);
  color: var(--c-ink-soft);
}

.section--light {
  background: var(--c-mist);
  color: var(--c-ink);
}

.section--light p {
  color: rgba(10, 10, 10, 0.72);
}

.section--light .section-kicker {
  color: var(--c-brand);
}

.section--light .section-title {
  color: var(--c-ink);
}

.section--light .section-index {
  background-image: none;
  color: var(--c-brand);
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.25rem;
  margin-bottom: 2.25rem;
}

.section-head-copy {
  display: grid;
  gap: 0.35rem;
}

.section-index {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.6rem, 6vw, 4rem);
  line-height: 0.9;
  margin-right: 1rem;
  background-image: var(--grad-gold);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.section-kicker {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--c-gold-bright);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4.5vw, 3.2rem);
  font-weight: 900;
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--c-surface);
}

.section-link {
  flex-shrink: 0;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--c-gold-bright);
  border-bottom: 2px solid rgba(212, 175, 55, 0.5);
  padding-bottom: 0.2rem;
  transition: border-color var(--duration) var(--ease), color var(--duration) var(--ease);
}

.section-link:hover {
  color: var(--c-gold);
  border-color: var(--c-gold);
}

@media (max-width: 640px) {
  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
}

/* ---------- 卡片 ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1.25rem;
}

.card {
  grid-column: span 4;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--c-surface);
  color: var(--c-ink);
  border: 1px solid rgba(10, 10, 10, 0.05);
  border-radius: var(--radius-soft);
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  transition: transform var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.12);
}

.card-inner {
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  flex: 1;
}

.card-title {
  font-family: var(--font-title);
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.3;
  color: inherit;
}

.card-text {
  font-size: 0.92rem;
  line-height: 1.7;
  color: rgba(10, 10, 10, 0.72);
  flex: 1;
}

.card--dark {
  background: var(--c-silver);
  color: #FFFFFF;
  border-color: rgba(255, 255, 255, 0.06);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.card--dark .card-text {
  color: rgba(255, 255, 255, 0.7);
}

.card--dark:hover {
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.36);
}

.card--span-3 { grid-column: span 3; }
.card--span-4 { grid-column: span 4; }
.card--span-5 { grid-column: span 5; }
.card--span-6 { grid-column: span 6; }
.card--span-7 { grid-column: span 7; }
.card--span-8 { grid-column: span 8; }

@media (max-width: 960px) {
  .card {
    grid-column: span 6;
  }
}

@media (max-width: 640px) {
  .card-grid {
    gap: 0.85rem;
  }

  .card {
    grid-column: span 12;
  }
}

/* ---------- 图片容器 ---------- */
.image-frame {
  position: relative;
  display: block;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--c-silver);
  border-radius: var(--radius-soft);
}

.image-frame--wide {
  aspect-ratio: 21 / 9;
}

.image-frame--portrait {
  aspect-ratio: 3 / 4;
}

.image-frame--square {
  aspect-ratio: 1;
}

.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease);
}

.card:hover .image-frame img {
  transform: scale(1.04);
}

.image-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(10, 10, 10, 0.4));
  pointer-events: none;
}

.image-frame--placeholder {
  display: grid;
  place-items: center;
  color: rgba(255, 255, 255, 0.35);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.image-frame--placeholder::before {
  content: "PHOTO";
}

/* ---------- 数据 ---------- */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.stat-num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.6rem, 6vw, 4.6rem);
  line-height: 0.9;
  background-image: var(--grad-gold);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  display: block;
  margin-top: 0.6rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
}

@media (max-width: 640px) {
  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
}

/* ---------- 手风琴 ---------- */
.accordion {
  border-top: 2px solid rgba(10, 10, 10, 0.08);
}

.acc-item {
  border-bottom: 1px solid rgba(10, 10, 10, 0.08);
}

.acc-item[data-open="true"] {
  background: rgba(27, 58, 140, 0.03);
}

.acc-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.2rem 0.25rem;
  text-align: left;
  font-family: var(--font-title);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--c-ink);
  transition: color var(--duration) var(--ease);
}

.acc-btn:hover {
  color: var(--c-brand);
}

.acc-icon {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 1.85rem;
  height: 1.85rem;
  border-radius: 50%;
  border: 1px solid rgba(10, 10, 10, 0.16);
  font-family: var(--font-body);
  font-size: 1.2rem;
  line-height: 1;
  color: var(--c-ink);
  transition: transform var(--duration) var(--ease), background var(--duration) var(--ease), border-color var(--duration) var(--ease), color var(--duration) var(--ease);
}

.acc-item[data-open="true"] .acc-icon {
  transform: rotate(45deg);
  background: var(--c-brand);
  border-color: var(--c-brand);
  color: #FFFFFF;
}

.acc-panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--duration) var(--ease);
}

.acc-item[data-open="true"] .acc-panel {
  grid-template-rows: 1fr;
}

.acc-panel-inner {
  overflow: hidden;
}

.acc-panel-body {
  padding: 0 2.75rem 1.5rem 0.25rem;
  font-size: 0.95rem;
  line-height: 1.8;
  color: rgba(10, 10, 10, 0.65);
}

/* ---------- 滚动显现 ---------- */
html[data-js="enabled"] [data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  will-change: opacity, transform;
}

html[data-js="enabled"] [data-reveal][data-revealed="true"] {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 焦点可见 ---------- */
:focus-visible {
  outline: 3px solid var(--c-gold);
  outline-offset: 2px;
}

.section--light :focus-visible,
.card :focus-visible,
.accordion :focus-visible,
.content-wrap :focus-visible {
  outline-color: var(--c-brand);
}

/* ---------- 动效降级 ---------- */
@supports not ((-webkit-background-clip: text) and (-webkit-text-fill-color: transparent)) {
  .stat-num,
  .section-index,
  .gold-gradient-text {
    background-image: none;
    color: var(--c-gold);
    -webkit-text-fill-color: var(--c-gold);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html[data-js="enabled"] [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}