/* ============================================================
   九州体育门户 · 共享样式层 /assets/site.css
   包含：Reset、设计变量、排版、头部轨道导航、页脚索引、
   通用按钮/卡片/网格/Bento/标签页/面包屑/图片容器等
   ============================================================ */

/* ---------- 0. 设计变量 ---------- */
:root {
  --color-primary: #0A1B3D;
  --color-card: #0E2348;
  --color-accent: #FF6B00;
  --color-gold: #FFC400;
  --color-light: #E5EEFF;
  --color-white: #FFFFFF;
  --color-deep: #1A2F4E;
  --color-cyan: #00C8D7;
  --color-ink: #07132B;

  --font-headline: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, system-ui, sans-serif;

  --header-w: 272px;
  --container-max: 1320px;
  --radius-lg: 22px;
  --radius-md: 14px;
  --radius-sm: 9px;
  --shadow-card: 0 16px 40px rgba(2, 8, 20, .35);
  --ease: cubic-bezier(.22, .61, .36, 1);
  --transition: 240ms var(--ease);
}

/* ---------- 1. Reset 与基础元素 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  color: var(--color-light);
  background-color: var(--color-primary);
  background-image:
    radial-gradient(1200px 600px at 85% -100px, rgba(255, 107, 0, .08), transparent 60%),
    linear-gradient(180deg, var(--color-primary), var(--color-ink));
  background-repeat: no-repeat;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

button {
  font: inherit;
  border: none;
  background: none;
  color: inherit;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

ul,
ol {
  list-style: none;
}

/* ---------- 2. 无障碍与焦点 ---------- */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 6px;
}

::selection {
  background: rgba(255, 107, 0, .55);
  color: #fff;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 50%;
  z-index: 2000;
  transform: translate(-50%, -300%);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  background: var(--color-accent);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 700;
  box-shadow: 0 8px 24px rgba(255, 107, 0, .4);
  transition: transform 240ms var(--ease);
}

.skip-link:focus {
  transform: translate(-50%, 0);
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  clip-path: inset(50%) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* ---------- 3. 排版 ---------- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-headline);
  font-weight: 800;
  color: var(--color-white);
  line-height: 1.22;
  letter-spacing: -.01em;
}

h1 {
  font-size: clamp(34px, 5.2vw, 56px);
}

h2 {
  font-size: clamp(24px, 3.4vw, 38px);
}

h3 {
  font-size: 20px;
}

h4 {
  font-size: 17px;
}

p {
  margin: 0;
}

strong {
  font-weight: 700;
}

em {
  font-style: italic;
}

.main-content,
main#main-content {
  display: block;
  min-height: 60vh;
  scroll-margin-top: 80px;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 44px);
}

/* ---------- 4. 通用工具 ---------- */
.deco-grid {
  background-image:
    linear-gradient(rgba(229, 238, 255, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(229, 238, 255, .045) 1px, transparent 1px);
  background-size: 44px 44px;
}

.cut-corner {
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.divider {
  height: 1px;
  border: 0;
  margin-block: 16px;
  background: linear-gradient(90deg, rgba(255, 107, 0, .4), rgba(229, 238, 255, .06) 40%, transparent);
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 24px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.2;
  transition:
    background var(--transition),
    color var(--transition),
    box-shadow var(--transition),
    transform var(--transition),
    border-color var(--transition);
}

.btn:active {
  transform: scale(.98);
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
  box-shadow: 0 8px 24px rgba(255, 107, 0, .35);
}

.btn-primary:hover {
  background: #FF8A3C;
  box-shadow: 0 10px 28px rgba(255, 107, 0, .45);
}

.btn-gold {
  background: var(--color-gold);
  color: var(--color-primary);
  box-shadow: 0 8px 24px rgba(255, 196, 0, .25);
}

.btn-gold:hover {
  background: #FFD54A;
}

.btn-ghost {
  border: 1px solid rgba(229, 238, 255, .2);
  color: var(--color-light);
  background: transparent;
}

.btn-ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-white);
  background: rgba(255, 107, 0, .08);
}

.btn-block {
  display: flex;
  width: 100%;
}

/* ---------- 6. 卡片与标签 ---------- */
.card {
  background: var(--color-card);
  border: 1px solid rgba(255, 255, 255, .06);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition:
    transform var(--transition),
    box-shadow var(--transition),
    border-color var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-color: rgba(255, 107, 0, .35);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .05em;
  background: rgba(255, 107, 0, .12);
  color: var(--color-accent);
  border: 1px solid rgba(255, 107, 0, .25);
}

.tag-gold {
  background: rgba(255, 196, 0, .1);
  color: var(--color-gold);
  border-color: rgba(255, 196, 0, .25);
}

.tag-cyan {
  background: rgba(0, 200, 215, .08);
  color: var(--color-cyan);
  border-color: rgba(0, 200, 215, .2);
}

.data-number {
  font-family: var(--font-headline);
  font-size: clamp(44px, 6vw, 64px);
  font-weight: 800;
  font-style: italic;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--color-gold);
  font-variant-numeric: tabular-nums;
}

.data-number.is-accent {
  color: var(--color-accent);
}

/* ---------- 7. 网格与 Bento ---------- */
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap, 20px);
}

@media (min-width: 768px) {
  .grid-col-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid-col-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .grid-col-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .grid-bento {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .bento-span-4 {
    grid-column: span 4;
  }

  .bento-span-5 {
    grid-column: span 5;
  }

  .bento-span-6 {
    grid-column: span 6;
  }

  .bento-span-7 {
    grid-column: span 7;
  }

  .bento-span-8 {
    grid-column: span 8;
  }

  .bento-span-12 {
    grid-column: 1 / -1;
  }

  .bento-row-2 {
    grid-row: span 2;
  }
}

.list-row {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(min(78vw, 360px), 1fr);
  gap: 16px;
  overflow-x: auto;
  padding-bottom: 8px;
  scroll-snap-type: x mandatory;
}

.list-row > * {
  scroll-snap-align: start;
}

/* ---------- 8. 面包屑、页面头与分区 ---------- */
.breadcrumb {
  padding: 14px 0;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 8px;
  font-size: 13px;
  color: rgba(229, 238, 255, .55);
}

.breadcrumb-list li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb-list li + li::before {
  content: "/";
  color: rgba(229, 238, 255, .25);
}

.breadcrumb-list a:hover {
  color: var(--color-accent);
}

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

.page-head {
  position: relative;
  padding: clamp(32px, 6vw, 64px) 0;
}

.page-head::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(50% 60% at 80% 0%, rgba(255, 107, 0, .1), transparent 60%),
    radial-gradient(40% 50% at 10% 100%, rgba(0, 200, 215, .06), transparent 55%);
  pointer-events: none;
}

.page-head > * {
  position: relative;
}

.section {
  padding-block: clamp(24px, 5vw, 56px);
  scroll-margin-top: 80px;
}

.section.is-bg-card {
  background: var(--color-card);
  border-radius: var(--radius-lg);
}

.section-head {
  margin-bottom: 28px;
}

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.section-eyebrow::before {
  content: "";
  width: 24px;
  height: 3px;
  border-radius: 3px;
  background: var(--color-accent);
}

.section-title {
  margin-bottom: 8px;
}

.section-desc {
  color: rgba(229, 238, 255, .7);
  max-width: 640px;
}

/* ---------- 9. 标签页 ---------- */
.tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  border-bottom: 1px solid rgba(229, 238, 255, .1);
}

.tab-btn {
  padding: 10px 18px;
  border-radius: 12px 12px 0 0;
  font-size: 15px;
  font-weight: 700;
  color: rgba(229, 238, 255, .6);
  border: 1px solid transparent;
  border-bottom: none;
  background: transparent;
  transition:
    color var(--transition),
    background var(--transition),
    border-color var(--transition);
}

.tab-btn:hover {
  color: var(--color-white);
}

.tab-btn[aria-selected="true"] {
  color: var(--color-accent);
  background: var(--color-card);
  border-color: rgba(229, 238, 255, .1);
}

.tab-panel {
  padding-top: 20px;
  animation: tab-fade 240ms var(--ease);
}

@keyframes tab-fade {
  from {
    opacity: 0;
    transform: translateY(6px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 10. 头部：移动端顶栏与抽屉 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(10, 27, 61, .96);
  border-bottom: 1px solid rgba(229, 238, 255, .07);
}

.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 68px;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 44px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--color-accent), #FF8E3C 68%, var(--color-gold) 120%);
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
  color: var(--color-white);
  font-family: var(--font-headline);
  font-size: 21px;
  font-weight: 900;
  line-height: 1;
  box-shadow: 0 6px 18px rgba(255, 107, 0, .35);
  transition:
    transform var(--transition),
    box-shadow var(--transition);
}

.brand:hover .brand-mark {
  transform: rotate(-4deg);
  box-shadow: 0 6px 24px rgba(255, 107, 0, .55);
}

.brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  min-width: 0;
}

.brand-name {
  font-size: 18px;
  font-weight: 800;
  color: var(--color-white);
  letter-spacing: .08em;
  white-space: nowrap;
}

.brand-en {
  margin-top: 4px;
  font-size: 9px;
  font-weight: 700;
  letter-spacing: .32em;
  color: var(--color-gold);
  text-transform: uppercase;
  white-space: nowrap;
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  border-radius: 12px;
  background: var(--color-card);
  border: 1px solid rgba(229, 238, 255, .1);
  transition:
    border-color var(--transition),
    background var(--transition);
}

.nav-toggle:hover {
  border-color: var(--color-accent);
}

.nav-toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-light);
  transition:
    transform 280ms var(--ease),
    opacity 180ms ease;
}

.nav-toggle.is-active {
  border-color: var(--color-accent);
  background: var(--color-deep);
}

.nav-toggle.is-active .nav-toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.is-active .nav-toggle-line:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-active .nav-toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-nav {
  --nav-w: min(86vw, 340px);
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 300;
  display: flex;
  flex-direction: column;
  width: var(--nav-w);
  padding: 24px 20px 20px;
  overflow-y: auto;
  min-height: 0;
  background:
    radial-gradient(120% 30% at 100% 0%, rgba(255, 107, 0, .1), transparent 55%),
    linear-gradient(180deg, var(--color-deep), var(--color-card) 55%, var(--color-primary));
  border-right: 1px solid rgba(229, 238, 255, .08);
  transform: translateX(-105%);
  visibility: hidden;
  transition:
    transform 320ms var(--ease),
    visibility 0s linear 320ms;
}

.site-nav[data-open] {
  transform: translateX(0);
  visibility: visible;
  transition:
    transform 320ms var(--ease),
    visibility 0s;
  box-shadow: 34px 0 90px rgba(0, 0, 0, .55);
}

.nav-backdrop {
  position: fixed;
  inset: 0;
  z-index: 290;
  background: rgba(3, 8, 18, .72);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity 280ms ease,
    visibility 0s linear 280ms;
}

.nav-backdrop[data-open] {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition:
    opacity 280ms ease,
    visibility 0s;
}

.nav-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex: 0 0 auto;
}

.nav-eyebrow {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--color-gold);
}

.nav-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  font-size: 24px;
  line-height: 1;
  color: var(--color-light);
  background: rgba(255, 255, 255, .06);
  transition:
    background var(--transition),
    color var(--transition);
}

.nav-close:hover {
  background: var(--color-accent);
  color: var(--color-white);
}

.nav-list {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-list::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: rgba(229, 238, 255, .12);
}

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 50px;
  padding: 10px 16px 10px 38px;
  border-radius: 14px;
  font-size: 15px;
  font-weight: 600;
  color: rgba(229, 238, 255, .75);
  letter-spacing: .04em;
  transition:
    background var(--transition),
    color var(--transition),
    transform var(--transition);
}

.nav-link::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 50%;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-deep);
  border: 2px solid rgba(229, 238, 255, .22);
  transform: translateY(-50%);
  transition:
    background var(--transition),
    border-color var(--transition),
    box-shadow var(--transition);
}

.nav-link:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, .05);
  transform: translateX(4px);
}

.nav-link:hover::before {
  border-color: var(--color-gold);
}

.nav-link[aria-current="page"] {
  color: var(--color-white);
  font-weight: 800;
  background: linear-gradient(90deg, rgba(255, 107, 0, .2), rgba(255, 107, 0, 0));
}

.nav-link[aria-current="page"]::before {
  background: var(--color-accent);
  border-color: var(--color-accent);
  animation: rail-pulse 2.4s var(--ease) infinite;
}

@keyframes rail-pulse {
  0%,
  100% {
    box-shadow: 0 0 0 3px rgba(255, 107, 0, .3);
  }

  50% {
    box-shadow: 0 0 0 9px rgba(255, 107, 0, .05);
  }
}

.nav-aux {
  margin-top: auto;
  padding-top: 20px;
  border-top: 1px solid rgba(229, 238, 255, .08);
}

.nav-aux-tip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 14px;
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(229, 238, 255, .5);
}

.pulse-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-cyan);
  box-shadow: 0 0 12px rgba(0, 200, 215, .8);
  animation: dot-pulse 2.4s ease-in-out infinite;
}

@keyframes dot-pulse {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }

  50% {
    opacity: .45;
    transform: scale(.75);
  }
}

/* ---------- 11. 头部：桌面侧边轨道 ---------- */
@media (min-width: 1024px) {
  body {
    padding-left: var(--header-w);
  }

  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--header-w);
    height: 100vh;
    height: 100dvh;
    overflow-y: auto;
    background:
      radial-gradient(120% 45% at 85% 0%, rgba(255, 107, 0, .12), transparent 55%),
      linear-gradient(180deg, var(--color-deep) 0%, var(--color-primary) 70%);
    border-right: 1px solid rgba(229, 238, 255, .07);
    border-bottom: 0;
  }

  .header-bar {
    height: auto;
    max-width: none;
    margin: 0;
    padding: 30px 22px 0;
    justify-content: flex-start;
  }

  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    width: 100%;
    height: auto;
    flex: 1;
    padding: 26px 14px 22px;
    overflow-y: auto;
    background: transparent;
    border-right: 0;
    transform: none;
    visibility: visible;
    box-shadow: none;
    transition: none;
  }

  .site-nav::before,
  .nav-backdrop {
    display: none;
  }

  .nav-head {
    display: none;
  }

  .nav-list {
    gap: 2px;
  }

  .nav-aux {
    display: block;
  }
}

/* ---------- 12. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 10vw, 96px);
  padding: clamp(48px, 7vw, 72px) 0 28px;
  background:
    radial-gradient(70% 100% at 15% 0%, rgba(255, 107, 0, .07), transparent 55%),
    radial-gradient(50% 80% at 90% 100%, rgba(255, 196, 0, .04), transparent 50%),
    linear-gradient(180deg, var(--color-deep) 0%, var(--color-primary) 65%);
  border-top: 1px solid rgba(229, 238, 255, .07);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), rgba(255, 107, 0, .25) 38%, transparent 70%);
  pointer-events: none;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: start;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 44px 40px;
  }

  .footer-brand-block {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
  }

  .footer-brand-block {
    grid-column: auto;
  }
}

.footer-trust {
  margin-top: 18px;
  max-width: 420px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(229, 238, 255, .6);
}

.brand-footer .brand-mark {
  width: 48px;
  height: 48px;
  font-size: 23px;
}

.brand-footer .brand-name {
  font-size: 22px;
}

.footer-col {
  display: flex;
  flex-direction: column;
}

.footer-title {
  margin-bottom: 16px;
  padding-bottom: 10px;
  position: relative;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--color-gold);
}

.footer-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 26px;
  height: 3px;
  border-radius: 3px;
  background: var(--color-accent);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-links a {
  display: inline-block;
  padding: 6px 0;
  font-size: 15px;
  color: rgba(229, 238, 255, .72);
  transition:
    color var(--transition),
    transform var(--transition);
}

.footer-links a:hover {
  color: var(--color-accent);
  transform: translateX(4px);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-contact-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-contact-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(229, 238, 255, .4);
}

.footer-contact-value {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-light);
  word-break: break-all;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 28px;
  margin-top: 48px;
  padding-top: 22px;
  border-top: 1px solid rgba(229, 238, 255, .07);
  font-size: 13px;
  color: rgba(229, 238, 255, .45);
}

.footer-copy {
  display: flex;
  gap: 8px;
}

.footer-icp {
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--color-gold);
}

/* ---------- 13. 返回顶部 ---------- */
.to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 180;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--color-accent);
  color: var(--color-white);
  font-size: 20px;
  line-height: 1;
  box-shadow: 0 10px 30px rgba(255, 107, 0, .4);
  opacity: 0;
  transform: translateY(18px) scale(.85);
  pointer-events: none;
  transition:
    opacity var(--transition),
    transform var(--transition),
    background var(--transition);
}

.to-top.is-visible {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.to-top:hover {
  background: var(--color-gold);
  color: var(--color-primary);
}

@media (min-width: 1024px) {
  .to-top {
    right: 28px;
    bottom: 28px;
  }
}

/* ---------- 14. 动效与减少动态偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}