/* ============================================================
   UED赛场 · 共享样式 /assets/site.css
   夜间赛场转播室 · 框架式导航 · 第二栏语法
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd, fieldset {
  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; cursor: pointer; }

[hidden] { display: none !important; }

:where(a, button, [tabindex], summary):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- 2. 设计变量 ---------- */
:root {
  /* 色彩体系 */
  --ink: #0B3B2E;
  --ink-deep: #061F18;
  --cyan: #3FFFD2;
  --orange: #FF6B2C;
  --cream: #F6F2E8;
  --mist: #C9D8CE;
  --line: #6E8B80;
  --glass: #143F35;
  --paper: #F4E9D6;
  --brown: #1A1512;

  /* 结构与节奏 */
  --header-h: 72px;
  --wrap: 1280px;
  --gutter: clamp(18px, 4vw, 48px);
  --radius: 2px;

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC",
    "Noto Sans CJK SC", sans-serif;
  --font-display: "Arial Narrow", "Helvetica Neue", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", var(--font-sans);
  --font-mono: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, Consolas,
    "Courier New", monospace;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    radial-gradient(1100px 540px at 84% -10%, rgba(63, 255, 210, 0.09), transparent 62%),
    radial-gradient(820px 480px at -6% 104%, rgba(255, 107, 44, 0.07), transparent 60%);
  background-attachment: fixed;
  color: var(--cream);
  font-family: var(--font-sans);
  font-size: clamp(16px, 0.55vw + 14px, 17.5px);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: 87.5%;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--cream);
  text-wrap: balance;
}

h1 { font-size: clamp(38px, 7vw, 64px); line-height: 0.98; letter-spacing: -0.035em; }
h2 { font-size: clamp(28px, 4.2vw, 48px); }
h3 { font-size: clamp(22px, 2.6vw, 34px); line-height: 1.1; }
h4 { font-size: clamp(18px, 1.7vw, 24px); line-height: 1.16; }
h5 { font-size: 18px; line-height: 1.2; }

p { max-width: none; }

strong { font-weight: 700; color: var(--cream); }

::selection { background: var(--cyan); color: var(--brown); }

#main-content { display: block; scroll-margin-top: calc(var(--header-h) + 14px); }

/* ---------- 4. 通用布局 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(32px, 5vw, 72px); }

.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)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--editorial { grid-template-columns: minmax(0, 7fr) minmax(0, 3fr); }

.stack { display: flex; flex-direction: column; gap: clamp(12px, 1.6vw, 20px); }

/* ---------- 5. 文字件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before {
  content: "";
  width: 16px;
  height: 1px;
  background: var(--cyan);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  border: 1px solid rgba(110, 139, 128, 0.5);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
  background: rgba(20, 63, 53, 0.45);
}

.tag--accent {
  color: var(--orange);
  border-color: rgba(255, 107, 44, 0.5);
  background: rgba(255, 107, 44, 0.08);
}

.prose {
  max-width: 68ch;
  color: rgba(246, 242, 232, 0.86);
}

.prose > * + * { margin-top: 1.1em; }
.prose h2, .prose h3 { margin-top: 1.8em; color: var(--cream); }
.prose ul, .prose ol { list-style: none; display: grid; gap: 0.6em; }
.prose li {
  position: relative;
  padding-left: 20px;
}
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 10px;
  height: 2px;
  background: var(--cyan);
}
.prose strong { color: var(--cyan); }

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.01em;
  transition: transform 0.16s var(--ease), background-color 0.16s var(--ease),
    color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.btn--primary {
  background: var(--orange);
  color: var(--brown);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
}

.btn--primary:hover {
  background: #ff8348;
  transform: translateY(-1px);
}

.btn--ghost {
  border-color: rgba(63, 255, 210, 0.55);
  color: var(--cyan);
  background: rgba(20, 63, 53, 0.35);
}

.btn--ghost:hover {
  background: rgba(63, 255, 210, 0.12);
  transform: translateY(-1px);
}

.btn--solid {
  background: var(--cyan);
  color: var(--brown);
}

.btn--solid:hover { background: #6affdf; transform: translateY(-1px); }

/* ---------- 7. 面包屑 ---------- */
.breadcrumbs {
  padding-block: clamp(14px, 2vw, 22px);
  margin-bottom: clamp(24px, 4vw, 44px);
  border-bottom: 1px solid rgba(110, 139, 128, 0.25);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

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

.breadcrumbs li + li::before { content: "/"; color: var(--line); }

.breadcrumbs a {
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.breadcrumbs a:hover { color: var(--cyan); border-color: var(--cyan); }

.breadcrumbs [aria-current="page"] { color: var(--cream); }

/* ---------- 8. 可复用图片容器 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid rgba(110, 139, 128, 0.4);
  border-radius: var(--radius);
  aspect-ratio: 16 / 9;
  background-color: var(--ink-deep);
  background-image:
    repeating-linear-gradient(115deg, rgba(63, 255, 210, 0.07) 0 2px, transparent 2px 9px),
    linear-gradient(160deg, var(--glass), var(--ink-deep));
}

.media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s var(--ease);
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, transparent 55%, rgba(6, 31, 24, 0.55));
}

a.media:hover > img { transform: scale(1.03); }

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

.media-caption {
  display: flex;
  gap: 8px;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--line);
}

.media-caption::before {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  margin-top: 0.45em;
  background: var(--orange);
}

/* ---------- 9. 跳至主内容 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 16px;
  border-radius: var(--radius);
  background: var(--cyan);
  color: var(--brown);
  font-size: 14px;
  font-weight: 700;
  transform: translateY(-180%);
  transition: transform 0.18s var(--ease);
}

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

/* ---------- 10. 头部框架导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(6, 31, 24, 0.94);
  border-bottom: 1px solid rgba(63, 255, 210, 0.22);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  backdrop-filter: blur(14px) saturate(120%);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 34px);
  width: 100%;
  max-width: var(--wrap);
  min-height: var(--header-h);
  margin-inline: auto;
  padding: 12px var(--gutter);
}

/* 品牌 */
.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 0 0 auto;
}

.brand__mark {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 900;
  font-stretch: 87.5%;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--cream);
}

.brand__mark::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 15px;
  margin-right: 8px;
  background: linear-gradient(180deg, var(--cyan), var(--orange));
  transform: skewX(-12deg) translateY(1px);
}

.brand__line {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--line);
  text-transform: uppercase;
}

.brand--footer .brand__mark { font-size: 24px; }

/* 主框架导航 */
.frame-nav {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.8vw, 26px);
  margin-left: auto;
}

.frame-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(2px, 1.1vw, 16px);
  counter-reset: navi;
}

.frame-nav__list li { counter-increment: navi; }

.frame-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 2px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--mist);
  white-space: nowrap;
  transition: color 0.18s var(--ease);
}

.frame-nav__link::before {
  content: counter(navi, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.05em;
  color: var(--line);
  transition: color 0.18s var(--ease);
}

.frame-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s var(--ease);
}

.frame-nav__link:hover { color: var(--cream); }
.frame-nav__link:hover::after { transform: scaleX(1); }

.frame-nav__link[aria-current="page"] { color: var(--cyan); }
.frame-nav__link[aria-current="page"]::before { color: var(--cyan); }
.frame-nav__link[aria-current="page"]::after { transform: scaleX(1); }

.frame-nav__utility {
  display: flex;
  align-items: center;
  gap: 6px;
  padding-left: clamp(8px, 1.4vw, 20px);
  border-left: 1px solid rgba(110, 139, 128, 0.35);
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: 3px 7px;
  border: 1px solid rgba(110, 139, 128, 0.5);
  border-radius: var(--radius);
  background: rgba(20, 63, 53, 0.5);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
  white-space: nowrap;
}

.chip--cyan {
  color: var(--cyan);
  border-color: rgba(63, 255, 210, 0.45);
}

.frame-nav__cta {
  flex: 0 0 auto;
  padding: 10px 16px;
  font-size: 13.5px;
  white-space: nowrap;
}

/* 移动按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 8px 12px;
  border: 1px solid rgba(63, 255, 210, 0.45);
  border-radius: var(--radius);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.site-header[data-open] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header[data-open] .nav-toggle__bars span:nth-child(2) { opacity: 0; }

.site-header[data-open] .nav-toggle__bars span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* 滚动进度轨道 */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0;
  height: 2px;
  pointer-events: none;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  box-shadow: 0 0 12px rgba(63, 255, 210, 0.55);
}

/* ---------- 11. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 96px);
  overflow: hidden;
  background: var(--ink-deep);
  border-top: 1px solid rgba(63, 255, 210, 0.25);
  color: var(--mist);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--cyan) 0 20%,
    transparent 20% 22%,
    var(--orange) 22% 44%,
    transparent 44% 46%,
    rgba(63, 255, 210, 0.35) 46% 100%
  );
}

.site-footer::after {
  content: "";
  position: absolute;
  top: -42%;
  right: -12%;
  width: 62vw;
  height: 62vw;
  max-width: 640px;
  max-height: 640px;
  pointer-events: none;
  background: radial-gradient(circle, rgba(63, 255, 210, 0.1), transparent 65%);
}

.site-footer__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr) minmax(0, 0.7fr);
  gap: clamp(28px, 4vw, 56px);
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(36px, 5vw, 64px) var(--gutter) clamp(24px, 3vw, 40px);
}

.footer-brand__intro {
  max-width: 34ch;
  margin-top: 16px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
}

.footer-contact {
  display: grid;
  gap: 9px;
  margin-top: 20px;
}

.footer-contact__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
}

.footer-contact__label {
  flex: 0 0 auto;
  min-width: 62px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--line);
}

.footer-contact__value {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--cream);
  word-break: break-word;
}

.footer-brand__note {
  max-width: 40ch;
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px dashed rgba(110, 139, 128, 0.4);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--line);
}

.footer-col__title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer-col__title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(63, 255, 210, 0.5), transparent);
}

.footer-col__list { display: grid; gap: 11px; }

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14.5px;
  color: var(--mist);
  transition: color 0.16s var(--ease);
}

.footer-link::before {
  content: "";
  flex: 0 0 auto;
  width: 10px;
  height: 1px;
  background: var(--line);
  transition: width 0.16s var(--ease), background-color 0.16s var(--ease);
}

.footer-link:hover { color: var(--cream); }
.footer-link:hover::before { width: 18px; background: var(--orange); }

.footer-link--sm { font-size: 12.5px; font-family: var(--font-mono); letter-spacing: 0.04em; }

.footer-base {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 16px var(--gutter) 28px;
  border-top: 1px solid rgba(110, 139, 128, 0.28);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--line);
}

.footer-base__meta { color: var(--line); }

.footer-base__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 18px;
}

/* ---------- 12. 平板 ---------- */
@media (max-width: 1180px) {
  .frame-nav__utility { display: none; }
}

@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--editorial { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 900px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-footer__inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .footer-brand { grid-column: 1 / -1; }
}

/* ---------- 13. 移动端导航与排版 ---------- */
@media (max-width: 960px) {
  :root { --header-h: 64px; }

  .nav-toggle { display: inline-flex; }

  .frame-nav {
    position: fixed;
    left: 0;
    right: 0;
    top: var(--header-h);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-left: 0;
    padding: 8px var(--gutter) 28px;
    max-height: calc(100dvh - var(--header-h));
    overflow-y: auto;
    background: var(--ink-deep);
    border-bottom: 1px solid rgba(110, 139, 128, 0.5);
    box-shadow: 0 28px 56px rgba(0, 0, 0, 0.55);
    transform: translateY(-10px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform 0.22s var(--ease), opacity 0.22s var(--ease),
      visibility 0.22s var(--ease);
  }

  .site-header[data-open] .frame-nav {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .frame-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .frame-nav__link {
    display: flex;
    padding: 15px 4px;
    font-size: 17px;
    border-bottom: 1px solid rgba(110, 139, 128, 0.22);
  }

  .frame-nav__link::after { display: none; }

  .frame-nav__link[aria-current="page"] {
    color: var(--cyan);
    box-shadow: inset 3px 0 0 var(--cyan);
    padding-left: 14px;
  }

  .frame-nav__utility {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 18px;
    padding: 16px 0 0;
    border-left: 0;
    border-top: 1px solid rgba(110, 139, 128, 0.28);
  }

  .frame-nav__cta {
    margin-top: 18px;
    width: 100%;
    padding: 14px 20px;
    font-size: 15px;
  }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }

  .site-footer__inner { grid-template-columns: minmax(0, 1fr); }

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

  .brand__line { display: none; }

  .footer-contact__value { font-size: 12px; }
}

/* ---------- 14. 减少动态偏好 ---------- */
@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;
  }

  .btn:hover,
  a.media:hover > img { transform: none; }

  .frame-nav__link::after { transform: scaleX(0); }
  .frame-nav__link[aria-current="page"]::after { transform: scaleX(1); }
  .scroll-progress { box-shadow: none; }
}

/* ---------- 15. 打印 ---------- */
@media print {
  .site-header,
  .site-footer,
  .skip-link,
  .scroll-progress,
  .nav-toggle { display: none !important; }

  body { background: #fff; color: #1A1512; }
  a { color: #1A1512; }
}