/* ============================================================
   亚新体育 · 共享站点工具箱
   文件位置：/assets/site.css
   夜间赛场氛围 + 展览画册式骨架
   ============================================================ */

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

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

body { margin: 0; }

main { display: block; }

h1, h2, h3, h4, h5, p, figure, blockquote, ul, ol { margin: 0; }

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

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

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

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

table { border-collapse: collapse; }

/* ---------- 2 · 设计变量 ---------- */
:root {
  /* 调色板 */
  --ink-900: #08111F;   /* 深空蓝 */
  --ink-800: #14181D;   /* 炭黑 */
  --ink-700: #1D2C42;   /* 层叠蓝灰 */
  --paper:   #F6F2E9;   /* 暖白 */
  --mist:    #C7CDD6;   /* 浅灰 */
  --print:   #8C929B;   /* 印刷灰 */
  --orange:  #FF5A1F;   /* 赛道橙 */
  --cyan:    #20E3C2;   /* 荧光青 */

  /* 语义色 */
  --bg: var(--ink-900);
  --surface: var(--ink-800);
  --surface-raised: var(--ink-700);
  --line: rgba(140, 146, 155, 0.30);
  --line-soft: rgba(140, 146, 155, 0.15);
  --text: var(--paper);
  --text-muted: var(--mist);
  --text-faint: var(--print);

  /* 字体 */
  --font-display: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC",
    "Noto Sans CJK SC", "Microsoft YaHei", system-ui, -apple-system,
    "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", "Roboto Mono",
    Menlo, Consolas, "Courier New", monospace;

  /* 12 级字号阶 */
  --step-1: 0.6875rem;
  --step-2: 0.75rem;
  --step-3: 0.8125rem;
  --step-4: 0.875rem;
  --step-5: 1rem;
  --step-6: 1.125rem;
  --step-7: 1.375rem;
  --step-8: 1.75rem;
  --step-9: 2.25rem;
  --step-10: 3rem;
  --step-11: 4.5rem;
  --step-12: 7.5rem;

  /* 版面 */
  --shell-max: 1320px;
  --gutter: clamp(1.125rem, 4vw, 4.5rem);
  --radius: 2px;
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --header-offset: 118px;
}

/* ---------- 3 · 基础排版 ---------- */
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-display);
  font-size: var(--step-5);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text);
}

h1 { font-size: clamp(var(--step-9), 5vw, var(--step-11)); line-height: 1.04; }
h2 { font-size: clamp(var(--step-8), 3.4vw, var(--step-10)); }
h3 { font-size: clamp(var(--step-7), 2vw, var(--step-8)); }
h4 { font-size: var(--step-6); }

p { line-height: 1.75; }

::selection {
  background: var(--orange);
  color: var(--ink-900);
}

#main-content { scroll-margin-top: calc(var(--header-offset) + 1rem); }

/* ---------- 4 · 可访问性 ---------- */
a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--radius);
}

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

.skip-link {
  position: absolute;
  top: -120px;
  left: var(--gutter);
  z-index: 300;
  padding: 0.7rem 1.15rem;
  background: var(--orange);
  color: var(--ink-900);
  font-size: var(--step-4);
  font-weight: 900;
  letter-spacing: 0.04em;
  border-radius: 0 0 var(--radius) var(--radius);
  transition: top 0.2s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 0;
  outline-offset: 2px;
}

/* ---------- 5 · 容器与工具类 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.page-body {
  padding-block: clamp(2rem, 5vw, 4rem);
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--step-2);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

/* ---------- 6 · 头部骨架 ---------- */
.header-rail {
  background: #060c16;
  border-bottom: 1px solid var(--line-soft);
}

.header-rail-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 34px;
  font-family: var(--font-mono);
  font-size: var(--step-2);
  letter-spacing: 0.1em;
  color: var(--text-faint);
}

.rail-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.rail-contact {
  margin: 0;
  white-space: nowrap;
  color: var(--mist);
}

.live-dot {
  display: inline-block;
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  animation: live-pulse 2.2s var(--ease) infinite;
}

@keyframes live-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(32, 227, 194, 0.55); }
  70%  { box-shadow: 0 0 0 8px rgba(32, 227, 194, 0); }
  100% { box-shadow: 0 0 0 0 rgba(32, 227, 194, 0); }
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--ink-900);
  border-bottom: 1px solid var(--line);
  transition: box-shadow 0.25s var(--ease), background-color 0.25s var(--ease);
}

.site-header[data-stuck] {
  background: #060e1a;
  box-shadow: 0 22px 48px -30px rgba(0, 0, 0, 0.95);
}

.header-main {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 1.6vw, 1.75rem);
  min-height: 74px;
  padding-block: 0.85rem;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  flex: 0 0 auto;
  transition: transform 0.18s var(--ease);
}

.brand:hover { transform: translateY(-1px); }

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  background: var(--orange);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: var(--step-3);
  font-weight: 700;
  letter-spacing: 0.04em;
  border-radius: var(--radius);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-size: var(--step-6);
  font-weight: 900;
  letter-spacing: 0.03em;
  color: var(--paper);
}

.brand-line {
  font-family: var(--font-mono);
  font-size: var(--step-1);
  letter-spacing: 0.14em;
  color: var(--text-faint);
}

/* 主导航：左右分置 */
.site-nav {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  gap: clamp(0.5rem, 1.5vw, 1.5rem);
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  min-width: 0;
}

.nav-list--tail { margin-inline-start: auto; }

.nav-item { display: flex; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.6rem;
  font-size: var(--step-4);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text-muted);
  border-radius: var(--radius);
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.nav-link:hover {
  color: var(--paper);
  background: rgba(29, 44, 66, 0.9);
}

.nav-link[aria-current="page"] { color: var(--orange); }

.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0.6rem;
  right: 0.6rem;
  bottom: 0.15rem;
  height: 2px;
  background: var(--orange);
}

/* 头部主按钮 */
.header-cta {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.62rem 1.05rem;
  background: var(--orange);
  border: 1px solid var(--orange);
  border-radius: var(--radius);
  color: var(--ink-900);
  font-size: var(--step-4);
  font-weight: 900;
  letter-spacing: 0.04em;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease),
    border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.header-cta:hover {
  background: var(--paper);
  border-color: var(--paper);
  color: var(--ink-900);
  transform: translateY(-2px);
}

/* 移动菜单按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  flex: 0 0 auto;
}

.nav-toggle-bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--paper);
  transition: transform 0.22s var(--ease), opacity 0.18s var(--ease);
}

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

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

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-of-type(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* 滚动进度 */
.header-progress {
  position: relative;
  height: 2px;
  background: var(--line-soft);
  overflow: hidden;
}

.header-progress::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--orange) 0%, var(--cyan) 100%);
  transform: scaleX(var(--progress, 0));
  transform-origin: 0 50%;
  transition: transform 0.1s linear;
}

/* ---------- 7 · 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3.5rem, 8vw, 7rem);
  padding-block: clamp(2.75rem, 6vw, 5rem) clamp(1.5rem, 3vw, 2.25rem);
  background: var(--ink-900);
  border-top: 1px solid var(--line);
  color: var(--text);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: clamp(80px, 12vw, 160px);
  height: 2px;
  background: var(--orange);
}

.footer-shell {
  display: flex;
  flex-direction: column;
  gap: clamp(2rem, 4vw, 3.25rem);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 2fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.9rem;
}

.footer-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--step-2);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer-wordmark {
  margin: 0;
  font-size: clamp(var(--step-10), 6vw, var(--step-11));
  font-weight: 900;
  line-height: 0.94;
  letter-spacing: -0.035em;
  color: var(--paper);
}

.footer-summary {
  margin: 0;
  max-width: 34ch;
  font-size: var(--step-5);
  line-height: 1.75;
  color: var(--text-muted);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(1rem, 2vw, 2rem);
}

.footer-col { min-width: 0; }

.footer-col-title {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin: 0;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--line);
  font-size: var(--step-3);
  font-weight: 900;
  letter-spacing: 0.16em;
  color: var(--paper);
}

.footer-col-index {
  font-family: var(--font-mono);
  font-size: var(--step-2);
  letter-spacing: 0.02em;
  color: var(--orange);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.9rem;
}

.footer-links a {
  display: inline-block;
  font-size: var(--step-4);
  color: var(--text-muted);
  transition: color 0.16s var(--ease), transform 0.16s var(--ease);
}

.footer-links a:hover {
  color: var(--paper);
  transform: translateX(3px);
}

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem clamp(1rem, 2.5vw, 2rem);
  padding-top: clamp(1.25rem, 3vw, 2rem);
  border-top: 1px solid var(--line);
}

.footer-contact-line {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--step-3);
  letter-spacing: 0.02em;
  color: var(--text-muted);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: var(--step-2);
  letter-spacing: 0.06em;
  color: var(--text-faint);
}

.footer-legal,
.footer-icp { margin: 0; }

/* ---------- 8 · 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.4rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: var(--step-4);
  font-weight: 900;
  letter-spacing: 0.04em;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease),
    border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.btn--primary {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink-900);
}

.btn--primary:hover {
  background: var(--paper);
  border-color: var(--paper);
  transform: translateY(-2px);
}

.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--paper);
}

.btn--ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translateY(-2px);
}

/* 面包屑 */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: var(--step-2);
  letter-spacing: 0.1em;
  color: var(--text-faint);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb-item:not(:last-child)::after {
  content: "/";
  color: var(--print);
  opacity: 0.6;
}

.breadcrumb-item a { color: var(--text-muted); }
.breadcrumb-item a:hover { color: var(--orange); }
.breadcrumb-item[aria-current="page"] { color: var(--paper); }

/* 正文容器 */
.prose {
  max-width: 68ch;
  font-size: var(--step-6);
  line-height: 1.8;
  color: var(--text-muted);
}

.prose > * + * { margin-top: 1.1em; }
.prose h2,
.prose h3 { margin-top: 1.9em; color: var(--paper); }
.prose strong { color: var(--paper); }
.prose a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(32, 227, 194, 0.4);
}
.prose ul,
.prose ol { padding-left: 1.2em; list-style: disc; }
.prose li + li { margin-top: 0.4em; }

/* 网格 */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(1rem, 2vw, 1.75rem);
}

.span-3  { grid-column: span 3; }
.span-4  { grid-column: span 4; }
.span-5  { grid-column: span 5; }
.span-6  { grid-column: span 6; }
.span-7  { grid-column: span 7; }
.span-8  { grid-column: span 8; }
.span-9  { grid-column: span 9; }
.span-12 { grid-column: span 12; }

/* 章节头 */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  margin-bottom: clamp(1.25rem, 3vw, 2.25rem);
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--line);
}

.section-title {
  margin: 0;
  font-size: clamp(var(--step-8), 3vw, var(--step-10));
}

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.55rem;
  background: var(--paper);
  color: var(--ink-900);
  border-radius: 1px;
  font-family: var(--font-mono);
  font-size: var(--step-2);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.tag--accent {
  background: var(--orange);
  color: var(--ink-900);
}

.tag--live {
  background: transparent;
  border: 1px solid rgba(32, 227, 194, 0.55);
  color: var(--cyan);
}

/* 旁注 */
.note {
  margin: 0;
  padding: 0.15rem 0 0.15rem 1rem;
  border-left: 2px solid var(--orange);
  font-size: var(--step-3);
  line-height: 1.7;
  color: var(--text-faint);
}

/* 纸张叠层卡片 */
.sheet {
  position: relative;
  padding: clamp(1.1rem, 2.2vw, 1.75rem);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: background-color 0.2s var(--ease), border-color 0.2s var(--ease),
    transform 0.2s var(--ease);
}

.sheet::after {
  content: "";
  position: absolute;
  inset: auto -6px -6px auto;
  width: calc(100% - 18px);
  height: calc(100% - 18px);
  border-right: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  border-radius: var(--radius);
  pointer-events: none;
  transition: border-color 0.2s var(--ease);
}

.sheet:hover {
  background: var(--surface-raised);
  border-color: rgba(140, 146, 155, 0.5);
  transform: translateY(-3px);
}

.sheet:hover::after { border-color: rgba(32, 227, 194, 0.35); }

/* ---------- 9 · 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--ink-700);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.media-frame img,
.media-frame .media-slot {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--16x9   { aspect-ratio: 16 / 9; }
.media-frame--4x3    { aspect-ratio: 4 / 3; }
.media-frame--1x1    { aspect-ratio: 1 / 1; }
.media-frame--21x9   { aspect-ratio: 21 / 9; }
.media-frame--portrait { aspect-ratio: 3 / 4; }

.media-frame--empty::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    135deg,
    rgba(140, 146, 155, 0.10) 0 2px,
    transparent 2px 12px
  );
}

.media-caption {
  margin-top: 0.6rem;
  font-family: var(--font-mono);
  font-size: var(--step-2);
  letter-spacing: 0.06em;
  color: var(--text-faint);
}

/* ---------- 10 · 响应式 ---------- */
@media (max-width: 1080px) {
  .footer-top { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (max-width: 980px) {
  :root { --header-offset: 108px; }

  .nav-toggle { display: flex; }
  .header-cta { display: none; }
  .brand-line { display: none; }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 120;
    flex: none;
    width: min(88vw, 360px);
    margin: 0;
    padding: 5.25rem 1.75rem 2.5rem;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--ink-800);
    border-left: 1px solid var(--line);
    box-shadow: -30px 0 60px -30px rgba(0, 0, 0, 0.9);
    overflow-y: auto;
    visibility: hidden;
    opacity: 0;
    transform: translateX(16%);
    transition: transform 0.28s var(--ease), opacity 0.2s ease,
      visibility 0.28s linear;
  }

  .site-nav[data-open] {
    visibility: visible;
    opacity: 1;
    transform: none;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-inline-start: 0;
  }

  .nav-list--tail {
    margin-inline-start: 0;
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--line-soft);
  }

  .nav-item { display: block; }

  .nav-link {
    width: 100%;
    justify-content: space-between;
    padding: 0.85rem 0.25rem;
    font-size: var(--step-6);
    border-bottom: 1px solid var(--line-soft);
    border-radius: 0;
  }

  .nav-link[aria-current="page"] {
    background: rgba(255, 90, 31, 0.1);
  }

  .nav-link[aria-current="page"]::after { display: none; }

  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .span-3,
  .span-4,
  .span-5 { grid-column: span 6; }

  .span-6,
  .span-7,
  .span-8,
  .span-9 { grid-column: span 12; }
}

@media (max-width: 760px) {
  .rail-contact { display: none; }
  .header-rail-inner { justify-content: flex-start; }
  .brand-name { font-size: var(--step-5); }
  .footer-wordmark { font-size: clamp(var(--step-9), 12vw, var(--step-10)); }
}

@media (max-width: 640px) {
  .footer-cols { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .footer-contact { flex-direction: column; gap: 0.4rem; }

  .span-3,
  .span-4,
  .span-5,
  .span-6,
  .span-7,
  .span-8,
  .span-9 { grid-column: span 12; }

  .prose { font-size: var(--step-5); }
}

/* ---------- 11 · 动效降级 ---------- */
@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;
    scroll-behavior: auto !important;
  }

  .header-progress::before { transition: none; }
  .sheet:hover { transform: none; }
  .btn:hover,
  .header-cta:hover,
  .footer-links a:hover,
  .brand:hover { transform: none; }
}