/* =============================================================
   满冠体育竞界 · 全站共享样式 site.css
   创意原型：赛道数据舱 / 暗夜黑 · 炽热红 · 金属银 · 荧光黄
   ============================================================= */

/* ---------- 0. 设计变量 ---------- */
:root {
  color-scheme: dark;
  --color-red: #E63946;
  --color-silver: #C0C0C0;
  --color-black: #0A0A0A;
  --color-yellow: #FFD700;
  --color-gray: #1A1A1A;
  --color-light: #F5F5F5;
  --color-silver-gray: #D3D3D3;
  --color-carbon: #2E2E2E;
  --font-display: Impact, "Arial Black", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Roboto Mono", Consolas, "Courier New", monospace;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --topbar-height: 4.25rem;
  --rail-width: 16.25rem;
  --content-width: 80rem;
  --radius: 0.375rem;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

body {
  background: var(--color-black);
  color: var(--color-light);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body.nav-lock {
  overflow: hidden;
}

@media (min-width: 64rem) {
  body.nav-lock {
    overflow: auto;
  }
}

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

button {
  font: inherit;
  color: inherit;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  color: var(--color-light);
  line-height: 1.12;
  letter-spacing: .01em;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 4rem);
  margin-bottom: .6em;
}

h2 {
  font-size: clamp(1.65rem, 3vw, 2.4rem);
  margin-bottom: .5em;
}

h3 {
  font-size: clamp(1.15rem, 1.6vw, 1.45rem);
  margin-bottom: .35em;
}

::selection {
  background: var(--color-red);
  color: var(--color-light);
}

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

::-webkit-scrollbar {
  width: .6rem;
  height: .6rem;
}

::-webkit-scrollbar-track {
  background: var(--color-black);
}

::-webkit-scrollbar-thumb {
  background: #333;
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-red);
}

/* ---------- 2. 正文容器与版式辅助 ---------- */
.site-main {
  min-height: 70vh;
  background:
    radial-gradient(ellipse 62% 38% at 88% 0%, rgba(230, 57, 70, .06), transparent 70%),
    var(--color-black);
  position: relative;
}

#main-content {
  scroll-margin-top: calc(var(--topbar-height) + .75rem);
  outline: none;
}

.page-wrap {
  max-width: var(--content-width);
  margin-inline: auto;
  padding: clamp(1.5rem, 4vw, 3.5rem) clamp(1rem, 4vw, 3rem) clamp(3rem, 6vw, 5rem);
}

.page-wrap a:not(.btn) {
  color: var(--color-yellow);
  text-decoration: underline;
  text-decoration-color: rgba(255, 215, 0, .35);
  text-underline-offset: .18em;
}

.page-wrap a:not(.btn):hover {
  color: var(--color-red);
  text-decoration-color: var(--color-red);
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 700;
  color: var(--color-red);
  letter-spacing: .2em;
  text-transform: uppercase;
  margin-bottom: .4rem;
}

.section-kicker::before {
  content: "";
  width: 1.75rem;
  height: 2px;
  background: var(--color-yellow);
}

.section-title {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.75rem, 4vw, 3rem);
  line-height: 1.12;
  color: var(--color-light);
  margin-bottom: 1rem;
}

.section-title .hl {
  color: var(--color-red);
}

.data-line {
  display: inline-flex;
  align-items: baseline;
  gap: .4rem;
  font-family: var(--font-mono);
  font-size: .85rem;
  color: var(--color-silver-gray);
}

.data-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--color-yellow);
}

.divider {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, transparent, rgba(192, 192, 192, .28), transparent);
  margin: 2.25rem 0;
}

.arena-band {
  display: block;
  height: .625rem;
  border: 0;
  background: repeating-linear-gradient(135deg, var(--color-red) 0 1rem, var(--color-black) 1rem 2rem);
}

/* ---------- 3. 面包屑与网格 ---------- */
.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem .75rem;
  margin: 0 0 1.5rem;
  padding: 0;
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: .75rem;
  font-size: .82rem;
  color: var(--color-silver-gray);
}

.breadcrumb li + li::before {
  content: "/";
  color: rgba(192, 192, 192, .35);
  font-family: var(--font-mono);
}

.breadcrumb a {
  color: var(--color-silver-gray);
  text-decoration: none;
}

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

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

.grid {
  display: grid;
  gap: clamp(1rem, 2vw, 1.75rem);
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 17rem), 1fr));
}

@media (min-width: 44rem) {
  .grid[data-cols="2"] {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 62rem) {
  .grid[data-cols="3"] {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .75rem 1.5rem;
  font-weight: 700;
  font-size: .92rem;
  letter-spacing: .05em;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: transform .18s var(--ease), box-shadow .18s var(--ease), background .18s, border-color .18s, color .18s;
}

.btn-primary {
  background: var(--color-red);
  color: var(--color-light);
}

.btn-primary:hover {
  background: #cf2f3d;
  color: var(--color-light);
  box-shadow: 0 .5rem 1.25rem rgba(230, 57, 70, .35);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  border-color: rgba(192, 192, 192, .4);
  color: var(--color-light);
}

.btn-ghost:hover {
  border-color: var(--color-yellow);
  color: var(--color-yellow);
}

/* ---------- 5. 卡片 ---------- */
.card {
  background: linear-gradient(160deg, var(--color-carbon), var(--color-gray));
  border: 1px solid rgba(192, 192, 192, .14);
  border-radius: var(--radius);
  padding: 1.5rem;
  position: relative;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), border-color .2s;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 .75rem 1.5rem rgba(0, 0, 0, .45);
  border-color: rgba(192, 192, 192, .3);
}

.card-dark {
  background: linear-gradient(160deg, #111, #191919);
}

.card-red-top {
  border-top: 3px solid var(--color-red);
}

.card-update {
  border-left: 3px solid var(--color-yellow);
  background: linear-gradient(135deg, rgba(255, 215, 0, .05), rgba(0, 0, 0, .35) 70%);
}

@media (prefers-reduced-motion: reduce) {
  .card:hover {
    transform: none;
  }
}

/* ---------- 6. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .25rem .7rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--color-silver-gray);
  background: var(--color-carbon);
  border: 1px solid rgba(192, 192, 192, .2);
  border-radius: 3px;
  white-space: nowrap;
}

.tag::before {
  content: "";
  width: .375rem;
  height: .375rem;
  border-radius: 50%;
  background: currentColor;
}

.tag-live {
  background: rgba(230, 57, 70, .15);
  border-color: rgba(230, 57, 70, .4);
  color: #ff9aa2;
}

.tag-live::before {
  animation: live-pulse 2s ease-in-out infinite;
}

.tag-update {
  background: rgba(255, 215, 0, .12);
  border-color: rgba(255, 215, 0, .35);
  color: var(--color-yellow);
}

/* ---------- 7. 折叠面板 ---------- */
.panel {
  background: var(--color-carbon);
  border: 1px solid rgba(192, 192, 192, .12);
  border-radius: var(--radius);
  overflow: hidden;
}

.panel + .panel {
  margin-top: .75rem;
}

.panel summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  color: var(--color-light);
  background: linear-gradient(90deg, rgba(230, 57, 70, .06), transparent 70%);
  border-left: 3px solid transparent;
  transition: border-color .2s, background .2s;
}

.panel summary::-webkit-details-marker,
.panel summary::marker {
  display: none;
  content: "";
}

.panel summary:hover {
  border-left-color: var(--color-red);
  background: linear-gradient(90deg, rgba(230, 57, 70, .14), transparent 70%);
}

.panel summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--color-red);
  flex-shrink: 0;
  transition: transform .2s;
}

.panel[open] summary::after {
  transform: rotate(45deg);
}

.panel-body {
  padding: 0 1.25rem 1.25rem;
  margin-left: 1.25rem;
  padding-left: 1.25rem;
  border-left: 3px solid rgba(230, 57, 70, .35);
  color: var(--color-silver-gray);
  font-size: .9rem;
  line-height: 1.8;
}

/* ---------- 8. 数据表格 ---------- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .9rem;
}

.data-table th {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .1em;
  text-align: left;
  padding: .65rem .75rem;
  color: var(--color-silver);
  background: var(--color-gray);
  border-bottom: 2px solid var(--color-red);
  white-space: nowrap;
}

.data-table td {
  padding: .65rem .75rem;
  border-bottom: 1px solid rgba(192, 192, 192, .12);
  color: var(--color-silver-gray);
}

.data-table tbody tr:hover td {
  background: rgba(230, 57, 70, .05);
  color: var(--color-light);
}

.data-table .num {
  font-family: var(--font-mono);
  color: var(--color-yellow);
}

/* ---------- 9. 图片容器 ---------- */
.image-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--color-gray);
  border: 1px solid rgba(192, 192, 192, .14);
  aspect-ratio: 16 / 9;
}

.image-frame[data-ratio="4/3"] {
  aspect-ratio: 4 / 3;
}

.image-frame[data-ratio="3/2"] {
  aspect-ratio: 3 / 2;
}

.image-frame[data-ratio="1/1"] {
  aspect-ratio: 1 / 1;
}

.image-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(230, 57, 70, .12), transparent 45%);
  pointer-events: none;
}

.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .3s var(--ease);
}

.image-frame:hover img {
  transform: scale(1.02);
}

.image-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  text-align: center;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .16em;
  color: var(--color-silver-gray);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, .03) 25%, transparent 25% 50%, rgba(255, 255, 255, .03) 50% 75%, transparent 75%) 0 0 / 1.5rem 1.5rem,
    linear-gradient(135deg, #1c1c1c, #262626);
}

.image-placeholder::before {
  content: attr(data-label);
  text-transform: uppercase;
}

@media (prefers-reduced-motion: reduce) {
  .image-frame:hover img {
    transform: none;
  }
}

/* ---------- 10. 头部与移动端导航 ---------- */
.site-header {
  position: relative;
  z-index: 100;
}

.skip-link {
  position: fixed;
  top: .75rem;
  left: .75rem;
  z-index: 999;
  background: var(--color-yellow);
  color: #0A0A0A;
  padding: .55rem 1rem;
  font-weight: 700;
  font-size: .85rem;
  border-radius: var(--radius);
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform .2s var(--ease);
}

.skip-link:focus {
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .skip-link {
    transition: none;
  }
}

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 400;
  background: linear-gradient(90deg, var(--color-red), var(--color-yellow));
  transform-origin: 0 50%;
  transform: scaleX(0);
  pointer-events: none;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 200;
  background: repeating-linear-gradient(90deg, rgba(255, 255, 255, .025) 0 2px, transparent 2px 18px), var(--color-black);
  border-bottom: 1px solid rgba(192, 192, 192, .14);
}

.topbar::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: clamp(13rem, 22vw, 19rem);
  height: 2px;
  background: linear-gradient(90deg, var(--color-red) 0 74%, var(--color-yellow) 74% 100%);
  opacity: .95;
  pointer-events: none;
}

.topbar-inner {
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0 clamp(1rem, 3vw, 2.5rem);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  text-decoration: none;
  color: var(--color-light);
}

.brand-totem,
.rail-mark,
.footer-mark {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 2.5rem;
  height: 2.5rem;
  background: linear-gradient(135deg, #f04451, #c12533);
  color: #fff;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: 1.1rem;
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - .55rem), calc(100% - .55rem) 100%, 0 100%);
}

.brand-totem::after,
.rail-mark::after,
.footer-mark::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(135deg, transparent 0 .4rem, rgba(10, 10, 10, .28) .4rem .8rem);
  mix-blend-mode: multiply;
  pointer-events: none;
}

.brand-title {
  display: grid;
  gap: .05rem;
}

.brand-name {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1rem, 2vw, 1.35rem);
  line-height: 1.15;
  color: var(--color-light);
  letter-spacing: .02em;
}

.brand-name em,
.rail-name em,
.footer-name em {
  color: var(--color-red);
  font-style: italic;
}

.brand-en {
  font-family: var(--font-mono);
  font-size: .6rem;
  letter-spacing: .28em;
  color: var(--color-silver-gray);
  white-space: nowrap;
}

.topbar-status {
  display: flex;
  align-items: center;
  gap: .75rem;
  margin-left: auto;
}

.topbar-clock {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .05em;
  color: var(--color-silver-gray);
  white-space: nowrap;
}

.live-pill {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  background: rgba(230, 57, 70, .14);
  border: 1px solid rgba(230, 57, 70, .45);
  color: #ffb8bd;
  border-radius: 999px;
  padding: .3rem .8rem;
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .08em;
  white-space: nowrap;
}

.live-dot {
  width: .425rem;
  height: .425rem;
  border-radius: 50%;
  background: var(--color-red);
  animation: live-pulse 2s ease-in-out infinite;
}

@keyframes live-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(230, 57, 70, .5);
  }
  60% {
    box-shadow: 0 0 0 .5rem rgba(230, 57, 70, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(230, 57, 70, 0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .live-dot,
  .tag-live::before {
    animation: none;
  }
}

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 2.6rem;
  height: 2.6rem;
  padding: 0;
  background: rgba(26, 26, 26, .9);
  border: 1px solid rgba(192, 192, 192, .28);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color .2s, background .2s;
}

.nav-toggle:hover {
  border-color: var(--color-red);
  background: rgba(230, 57, 70, .15);
}

.nav-toggle-bar {
  display: block;
  width: 1.1rem;
  height: 2px;
  background: var(--color-light);
  border-radius: 2px;
  transition: transform .25s var(--ease), opacity .2s;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) 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(-7px) rotate(-45deg);
}

@media (prefers-reduced-motion: reduce) {
  .nav-toggle-bar {
    transition: none;
  }
}

.nav-overlay {
  position: fixed;
  top: var(--topbar-height);
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 150;
  background: rgba(10, 10, 10, .66);
  opacity: 0;
  visibility: hidden;
  transition: opacity .25s var(--ease), visibility .25s;
}

.nav-overlay[data-open="true"] {
  opacity: 1;
  visibility: visible;
}

/* ---------- 11. 品牌轨道导航 ---------- */
.rail-nav {
  position: fixed;
  top: var(--topbar-height);
  bottom: 0;
  left: 0;
  z-index: 160;
  width: min(86vw, 21rem);
  background: repeating-linear-gradient(180deg, rgba(192, 192, 192, .045) 0 1px, transparent 1px 3.5rem), linear-gradient(180deg, #161616, #101010);
  border-right: 1px solid rgba(192, 192, 192, .14);
  transform: translateX(-105%);
  transition: transform .28s var(--ease);
}

.rail-nav::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--color-red), rgba(230, 57, 70, .12), var(--color-yellow));
}

.rail-nav::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-yellow), var(--color-red));
}

.rail-nav[data-open="true"] {
  transform: none;
  box-shadow: .75rem 0 2rem rgba(0, 0, 0, .55);
}

.rail-inner {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.rail-brand {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: 1.2rem 1.25rem .9rem;
  text-decoration: none;
  color: var(--color-light);
  border-bottom: 1px solid rgba(192, 192, 192, .12);
}

.rail-mark {
  width: 2.25rem;
  height: 2.25rem;
  font-size: 1rem;
}

.rail-id {
  display: grid;
  gap: .1rem;
}

.rail-name {
  display: block;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: 1.08rem;
  line-height: 1.2;
  color: var(--color-light);
}

.rail-tag {
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .22em;
  color: var(--color-silver-gray);
}

.rail-list {
  list-style: none;
  margin: .65rem 0;
  padding: 0 .75rem;
  display: grid;
  gap: .15rem;
}

.rail-link {
  display: flex;
  align-items: center;
  gap: .8rem;
  padding: .8rem .75rem;
  color: var(--color-silver-gray);
  text-decoration: none;
  font-weight: 700;
  font-size: .93rem;
  letter-spacing: .06em;
  border-radius: 3px;
  border-left: 3px solid transparent;
  transition: color .2s, background .2s, border-color .2s, transform .2s var(--ease);
}

.rail-link:hover {
  color: var(--color-light);
  background: rgba(230, 57, 70, .09);
  border-left-color: var(--color-yellow);
  transform: translateX(3px);
}

.rail-link[aria-current="page"] {
  color: var(--color-light);
  background: linear-gradient(90deg, rgba(230, 57, 70, .22), rgba(230, 57, 70, .02) 80%);
  border-left-color: var(--color-red);
}

.rail-index {
  font-family: var(--font-mono);
  font-size: .7rem;
  color: rgba(192, 192, 192, .55);
  width: 1.6rem;
  flex-shrink: 0;
  transition: color .2s;
}

.rail-link:hover .rail-index {
  color: var(--color-yellow);
}

.rail-link[aria-current="page"] .rail-index {
  color: var(--color-yellow);
}

.rail-foot {
  margin-top: auto;
  padding: 1rem 1.25rem;
  background: linear-gradient(135deg, rgba(230, 57, 70, .16), rgba(255, 215, 0, .05) 72%);
  border-top: 1px solid rgba(192, 192, 192, .12);
  display: grid;
  gap: .25rem;
}

.rail-foot-slogan {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: .92rem;
  color: var(--color-light);
  line-height: 1.3;
}

.rail-foot-note {
  font-family: var(--font-mono);
  font-size: .64rem;
  letter-spacing: .08em;
  color: var(--color-silver-gray);
}

/* ---------- 12. 桌面端侧轨固定 ---------- */
@media (min-width: 64rem) {
  .site-main,
  .site-footer {
    margin-left: var(--rail-width);
  }

  .rail-nav {
    width: var(--rail-width);
    transform: none;
    transition: none;
    box-shadow: none;
  }

  .nav-toggle,
  .nav-overlay {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .rail-nav,
  .nav-overlay {
    transition: none;
  }

  .rail-link:hover {
    transform: none;
  }
}

/* ---------- 13. 页脚 ---------- */
.site-footer {
  position: relative;
  background: #080808;
  border-top: 3px solid var(--color-red);
}

.site-footer::before {
  content: "";
  display: block;
  height: .75rem;
  background-image:
    repeating-linear-gradient(90deg, var(--color-yellow) 0 3.5rem, #080808 3.5rem 7rem),
    repeating-linear-gradient(90deg, #080808 0 3.5rem, var(--color-yellow) 3.5rem 7rem);
  background-position: 0 0, 0 100%;
  background-size: 100% 50%, 100% 50%;
  background-repeat: no-repeat, no-repeat;
  opacity: .85;
}

.footer-inner {
  max-width: calc(var(--content-width) + 4rem);
  margin-inline: auto;
  padding: 0 clamp(1rem, 4vw, 3rem);
}

.footer-grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  grid-template-columns: 1fr;
  padding: clamp(2.5rem, 5vw, 4.5rem) 0 clamp(1.75rem, 4vw, 3rem);
}

.footer-brand {
  max-width: 38rem;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  text-decoration: none;
  color: var(--color-light);
  margin-bottom: .9rem;
}

.footer-name {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  line-height: 1.1;
  color: var(--color-light);
}

.footer-about {
  color: var(--color-silver-gray);
  font-size: .9rem;
  line-height: 1.8;
  margin-bottom: .85rem;
}

.footer-trust {
  color: var(--color-silver);
  font-size: .85rem;
  line-height: 1.7;
  border-left: 2px solid var(--color-yellow);
  padding-left: .75rem;
}

.footer-title {
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 700;
  font-style: normal;
  letter-spacing: .18em;
  color: var(--color-red);
  text-transform: uppercase;
  margin-bottom: 1rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid rgba(192, 192, 192, .14);
  position: relative;
}

.footer-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 2.5rem;
  height: 2px;
  background: var(--color-yellow);
}

.footer-links {
  list-style: none;
  display: grid;
  gap: .45rem;
}

.footer-links a {
  color: var(--color-silver-gray);
  text-decoration: none;
  font-size: .92rem;
  transition: color .2s, padding-left .2s var(--ease);
}

.footer-links a:hover {
  color: var(--color-yellow);
  padding-left: .3rem;
}

.footer-contact-list {
  list-style: none;
  display: grid;
  gap: .5rem;
  font-size: .88rem;
  color: var(--color-silver-gray);
}

.contact-label {
  display: inline-block;
  min-width: 4.4em;
  color: var(--color-silver);
  font-weight: 700;
  font-size: .78rem;
  letter-spacing: .08em;
}

.contact-value {
  font-family: var(--font-mono);
  color: var(--color-light);
  word-break: break-all;
}

.footer-link-more {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  margin-top: .85rem;
  color: var(--color-yellow);
  text-decoration: none;
  font-weight: 700;
  font-size: .85rem;
}

.footer-link-more::after {
  content: "→";
  font-family: var(--font-mono);
}

.footer-link-more:hover {
  color: var(--color-red);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem 1.5rem;
  padding: 1.1rem 0 1.5rem;
  border-top: 1px solid rgba(192, 192, 192, .12);
  font-size: .8rem;
  color: var(--color-silver-gray);
}

.footer-copy {
  margin-right: auto;
}

.footer-icp {
  font-family: var(--font-mono);
  color: var(--color-silver);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem 1.25rem;
}

.footer-legal a {
  color: var(--color-silver-gray);
  text-decoration: none;
  font-weight: 600;
}

.footer-legal a:hover {
  color: var(--color-yellow);
  text-decoration: underline;
  text-underline-offset: .2em;
}

@media (min-width: 48rem) {
  .footer-grid {
    grid-template-columns: 1.4fr 1fr;
  }

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

@media (min-width: 62rem) {
  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1.4fr;
  }

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

/* ---------- 14. 返回顶部 ---------- */
.top-btn {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 220;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius);
  background: var(--color-carbon);
  border: 1px solid rgba(192, 192, 192, .3);
  color: var(--color-light);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - .5rem), calc(100% - .5rem) 100%, 0 100%);
  opacity: 0;
  visibility: hidden;
  transform: translateY(.5rem);
  transition: opacity .25s var(--ease), transform .25s var(--ease), visibility .25s, border-color .2s, background .2s;
}

.top-btn[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.top-btn:hover {
  background: var(--color-red);
  border-color: var(--color-red);
  color: #fff;
}

@media (prefers-reduced-motion: reduce) {
  .top-btn {
    transition: none;
  }
}

/* ---------- 15. 滚动显现 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(1rem);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}

.reveal[data-revealed="true"] {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

@media (scripting: none) {
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 16. 小屏微调 ---------- */
@media (max-width: 48rem) {
  .brand-en {
    display: none;
  }
}

@media (max-width: 30rem) {
  :root {
    --topbar-height: 3.9rem;
  }

  .topbar-inner {
    gap: .6rem;
    padding: 0 .75rem;
  }

  .brand-totem {
    width: 2.25rem;
    height: 2.25rem;
    font-size: .95rem;
  }

  .topbar-status {
    gap: .5rem;
  }

  .topbar-clock {
    display: none;
  }

  .live-pill {
    padding: .25rem .6rem;
    font-size: .72rem;
  }
}