/* ============================================================
   竞博中心 · 共享样式 /assets/site.css
   深墨蓝基座 + 信号橙 / 电光青 / 暖金 的目录型框架
   ============================================================ */

:root {
  --ink-950: #04090F;
  --ink-900: #07111F;
  --ink-800: #0C1B2E;
  --ink-700: #18324D;

  --signal: #FF6B35;
  --cyan: #3BD8E8;
  --gold: #D6A84B;
  --mist: #A9BED2;
  --mist-dim: rgba(169, 190, 210, 0.55);
  --paper: #EAF2F8;
  --mint: #6FE3C1;

  --font-display: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --gutter: clamp(18px, 4vw, 56px);
  --frame-max: 1440px;
  --radius: 2px;
  --line: 1px solid var(--ink-700);
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --head-h: 78px;
}

/* ---------- reset ---------- */

*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 104px;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--ink-900);
  background-image:
    radial-gradient(920px 540px at 84% -12%, rgba(59, 216, 232, 0.10), transparent 62%),
    radial-gradient(780px 480px at 2% 6%, rgba(255, 107, 53, 0.075), transparent 60%);
  background-repeat: no-repeat;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 { margin: 0; font-family: var(--font-display); line-height: 1.2; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; }
img, svg, video { max-width: 100%; }
img { height: auto; }
a { color: var(--cyan); }
button { font: inherit; }
::selection { background: var(--signal); color: var(--ink-950); }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 1px;
}

.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;
}

.mono { font-family: var(--font-mono); font-weight: 500; letter-spacing: 0.04em; }

/* ---------- skip link ---------- */

.skip-link {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 200;
  display: inline-block;
  padding: 10px 18px;
  border-radius: var(--radius);
  background: var(--signal);
  color: #08111B;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-decoration: none;
  transform: translateY(-170%);
  transition: transform 0.2s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline: 2px solid var(--paper);
  outline-offset: 3px;
}

/* ---------- 站点头部 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(7, 17, 31, 0.94);
  -webkit-backdrop-filter: blur(18px) saturate(150%);
  backdrop-filter: blur(18px) saturate(150%);
  border-bottom: 1px solid var(--ink-700);
}

.site-header::before {
  content: "";
  display: block;
  height: 2px;
  width: 100%;
  background: linear-gradient(
    90deg,
    var(--signal) 0 18%,
    var(--cyan) 18% 25%,
    var(--ink-700) 25% 100%
  );
}

.header-frame {
  max-width: var(--frame-max);
  margin-inline: auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  padding: 12px var(--gutter);
  min-height: 68px;
}

/* 品牌锁合 */

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 4px 0;
  color: var(--paper);
  text-decoration: none;
}

.brand-glyph {
  flex: none;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  background: var(--signal);
  color: #08111B;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
  transition: background-color 0.2s var(--ease);
}

.brand:hover .brand-glyph { background: var(--cyan); }

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: 0.04em;
}

.brand-descriptor {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--mist-dim);
  white-space: nowrap;
}

/* 移动端索引按钮 */

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius);
  background: transparent;
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  cursor: pointer;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

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

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}

.nav-toggle-bars span {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform 0.22s var(--ease);
}

.site-header[data-open] .nav-toggle-bars span:first-child { transform: translateY(2.75px) rotate(45deg); }
.site-header[data-open] .nav-toggle-bars span:last-child { transform: translateY(-2.75px) rotate(-45deg); }
.site-header[data-open] .nav-toggle { border-color: var(--signal); color: var(--signal); }

/* 导航 */

.site-nav {
  display: none;
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  z-index: 95;
  padding: 18px var(--gutter) 26px;
  background: rgba(5, 13, 23, 0.985);
  border-bottom: 1px solid var(--ink-700);
  box-shadow: 0 24px 48px rgba(2, 6, 12, 0.6);
  max-height: calc(100vh - 96px);
  overflow-y: auto;
}

.site-header[data-open] .site-nav { display: block; }

.nav-index {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.22em;
  color: var(--mist-dim);
}

.nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.nav-item { display: block; }

.nav-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  width: 100%;
  padding: 13px 2px;
  border-bottom: 1px solid rgba(24, 50, 77, 0.55);
  color: var(--mist);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.nav-num {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--mist-dim);
  transition: color 0.18s var(--ease);
}

.nav-text { white-space: nowrap; }

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.22s var(--ease), background-color 0.22s var(--ease);
}

.nav-link:hover { color: var(--paper); }
.nav-link:hover .nav-num { color: var(--cyan); }

.nav-link[aria-current="page"] {
  color: var(--paper);
  border-bottom-color: var(--signal);
}

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

/* 头部 CTA */

.header-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--ink-700);
}

.header-actions .btn { flex: 1 1 160px; justify-content: center; }

/* 阅读进度条 */

.scroll-meter {
  height: 2px;
  background: rgba(24, 50, 77, 0.7);
  overflow: hidden;
}

.scroll-meter-fill {
  display: block;
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--signal));
  transition: width 0.12s linear;
}

/* ---------- 通用按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.03em;
  line-height: 1.3;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease), color 0.18s var(--ease), transform 0.18s var(--ease);
}

.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--signal);
  color: #08111B;
}

.btn-primary:hover { background: #FF8557; color: #08111B; }

.btn-ghost {
  background: transparent;
  border-color: var(--ink-700);
  color: var(--paper);
}

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

/* ---------- 站点页脚 ---------- */

.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 112px);
  border-top: 1px solid var(--ink-700);
  background: linear-gradient(180deg, rgba(12, 27, 46, 0.92), rgba(4, 9, 15, 0.99));
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(240px, 42%);
  height: 2px;
  background: var(--gold);
}

.footer-frame {
  max-width: var(--frame-max);
  margin-inline: auto;
  padding: clamp(40px, 6vw, 76px) var(--gutter) clamp(26px, 4vw, 44px);
  display: grid;
  grid-template-columns: 1.15fr 0.85fr 1fr;
  gap: clamp(26px, 4vw, 64px);
}

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

.footer-tagline {
  margin-top: 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 34ch;
}

.footer-mark {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  padding: 5px 11px;
  border: 1px solid rgba(214, 168, 75, 0.42);
  border-radius: 1px;
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.14em;
}

.footer-mark::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--gold);
  transform: rotate(45deg);
}

.footer-heading {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.22em;
  color: var(--mist-dim);
}

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

.footer-list {
  list-style: none;
  display: grid;
  gap: 0;
}

.footer-link {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 0;
  border-bottom: 1px solid rgba(24, 50, 77, 0.65);
  color: var(--paper);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), padding-left 0.18s var(--ease);
}

.footer-link::before {
  content: "";
  width: 10px;
  height: 1px;
  background: var(--ink-700);
  transition: background-color 0.18s var(--ease), width 0.18s var(--ease);
}

.footer-link:hover {
  color: var(--cyan);
  border-bottom-color: rgba(59, 216, 232, 0.55);
  padding-left: 4px;
}

.footer-link:hover::before { background: var(--cyan); width: 16px; }

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

.contact-list {
  list-style: none;
  display: grid;
  gap: 14px;
}

.contact-item { display: grid; gap: 3px; }

.contact-key {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--mist-dim);
}

.contact-value {
  font-size: 14px;
  line-height: 1.65;
  color: var(--paper);
  word-break: break-word;
}

.footer-note {
  margin-top: 18px;
  padding-left: 12px;
  border-left: 2px solid var(--ink-700);
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--mist-dim);
}

.footer-base {
  border-top: 1px solid var(--ink-700);
  background: rgba(4, 9, 15, 0.6);
}

.footer-base-inner {
  max-width: var(--frame-max);
  margin-inline: auto;
  padding: 16px var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--mist-dim);
}

.legal-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
}

.legal-link {
  font-size: 12px;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.legal-link:hover { color: var(--cyan); }

.footer-icp {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--gold);
}

/* ---------- 通用版式 ---------- */

.container {
  width: 100%;
  max-width: var(--frame-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(44px, 7vw, 96px); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--signal);
}

.display-title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(38px, 7.2vw, 86px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.display-title .accent { color: var(--signal); font-style: normal; }

.section-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.lede {
  max-width: 68ch;
  font-size: clamp(15px, 1.2vw, 17px);
  line-height: 1.8;
  color: var(--mist);
}

/* 面包屑 */

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--mist-dim);
}

.breadcrumb-link {
  color: var(--mist);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.breadcrumb-link:hover { color: var(--cyan); }

.breadcrumb-sep { color: var(--ink-700); }

.breadcrumb-current { color: var(--paper); }

/* 信息面板 */

.panel {
  display: block;
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--ink-700);
  border-radius: var(--radius);
  background: var(--ink-800);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease), background-color 0.2s var(--ease);
}

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

.panel-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 800;
  line-height: 1.3;
  color: var(--paper);
}

.panel-note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--mist-dim);
}

.index-tag {
  display: inline-block;
  padding: 3px 8px;
  border: 1px solid var(--ink-700);
  border-radius: 1px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

/* 网格 */

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 32px);
}

.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* 图片容器 */

.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius);
  background: linear-gradient(155deg, #0C1B2E, #07111F);
  aspect-ratio: 16 / 10;
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--band { aspect-ratio: 3 / 1; }
.media-frame--tall { aspect-ratio: 4 / 5; }

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(59, 216, 232, 0.10) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(0deg, rgba(59, 216, 232, 0.07) 0 1px, transparent 1px 64px);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(120deg, transparent 42%, rgba(255, 107, 53, 0.16) 74%, transparent 94%);
}

.media-frame > img,
.media-frame > svg {
  position: relative;
  z-index: 0;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 平板 ---------- */

@media (max-width: 900px) {
  .footer-frame { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-tagline { max-width: 52ch; }
}

@media (max-width: 720px) {
  .grid-2,
  .grid-3 { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 560px) {
  .footer-frame { grid-template-columns: minmax(0, 1fr); gap: 30px; }
  .footer-base-inner { flex-direction: column; align-items: flex-start; gap: 10px; }
  .brand-descriptor { letter-spacing: 0.1em; }
}

/* ---------- 桌面 ---------- */

@media (min-width: 1024px) {
  .header-frame {
    grid-template-columns: auto minmax(0, 1fr);
    gap: clamp(20px, 3vw, 44px);
    padding-block: 0;
    min-height: var(--head-h);
  }

  .nav-toggle { display: none; }

  .site-nav {
    display: flex;
    position: static;
    justify-self: end;
    align-items: center;
    gap: clamp(12px, 1.8vw, 28px);
    padding: 0;
    margin: 0;
    max-height: none;
    overflow: visible;
    background: none;
    border: 0;
    box-shadow: none;
  }

  .nav-index { display: none; }

  .nav-list {
    flex-direction: row;
    flex-wrap: nowrap;
    gap: clamp(6px, 1.1vw, 18px);
  }

  .nav-link {
    width: auto;
    padding: 10px 2px;
    border-bottom: 0;
    font-size: 13.5px;
  }

  .header-actions {
    flex-wrap: nowrap;
    margin: 0;
    padding: 0;
    border: 0;
  }

  .header-actions .btn { flex: 0 0 auto; }
  .header-actions .btn-ghost { display: none; }
}

@media (min-width: 1280px) {
  .header-actions .btn-ghost { display: inline-flex; }
  .nav-link { font-size: 14px; }
}

/* ---------- 减少动效 ---------- */

@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;
  }
}