/* ==========================================================================
   YT赛场 · 共享样式表 /assets/site.css
   夜场记分牌气质：墨绿轨道 + 炭黑层 + 荧光青焦点 + 信号橙提醒
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, ul, ol { margin: 0; }

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

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

button, input, select, textarea { font: inherit; color: inherit; }

button {
  background: none;
  border: 0;
  cursor: pointer;
}

a { color: inherit; }

table { border-collapse: collapse; width: 100%; }

/* ---------- 2. tokens ---------- */
:root {
  --ink-green: #0B1F1A;
  --charcoal: #101314;
  --deep-green: #14332B;
  --neon-cyan: #2FE3C8;
  --signal-orange: #FF6A2B;
  --paper: #F2F7F5;
  --sage: #8FA8A0;
  --line: #25423A;
  --orange-brown: #A8461F;

  --rail-w: 96px;
  --shell-max: 1320px;
  --shell-pad: 20px;

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC",
    "Noto Sans CJK SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-num: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo,
    Consolas, "Liberation Mono", monospace;

  --step-1: 13px;
  --step0: 17px;
  --step1: 20px;
  --step2: 28px;
  --step3: 40px;
  --step4: 56px;
}

/* ---------- 3. base ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink-green);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: var(--step0);
  line-height: 1.75;
  letter-spacing: 0.01em;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(115deg, rgba(47, 227, 200, 0.05) 0 1px, transparent 1px 100%),
    linear-gradient(0deg, rgba(37, 66, 58, 0.5) 0 1px, transparent 1px 100%);
  background-size: 100% 240px, 100% 48px;
  opacity: 0.85;
}

body.is-nav-open { overflow: hidden; }

h1, h2, h3, h4 {
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.14;
  color: var(--paper);
}

h1 { font-size: clamp(34px, 6vw, var(--step4)); }
h2 { font-size: clamp(26px, 4.2vw, var(--step3)); }
h3 { font-size: clamp(20px, 3vw, var(--step2)); }
h4 { font-size: var(--step1); }

p { text-wrap: pretty; }

::selection {
  background: var(--neon-cyan);
  color: var(--ink-green);
}

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

#main-content {
  position: relative;
  z-index: 1;
  scroll-margin-top: 84px;
}

/* ---------- 4. utilities ---------- */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--shell-pad);
}

.grid {
  display: grid;
  gap: 20px;
  grid-template-columns: minmax(0, 1fr);
}

.prose {
  max-width: 40ch;
  font-size: var(--step0);
  line-height: 1.78;
  color: rgba(242, 247, 245, 0.8);
}

.prose p + p { margin-top: 1em; }
.prose h2,
.prose h3 { margin-top: 1.7em; margin-bottom: 0.5em; color: var(--paper); }
.prose strong { color: var(--paper); }
.prose a { color: var(--neon-cyan); text-decoration: underline; text-underline-offset: 3px; }
.prose ul { margin: 1em 0; padding-left: 1.1em; list-style: square; }
.prose li + li { margin-top: 0.4em; }

/* ---------- 5. skip link ---------- */
.skip-link {
  position: absolute;
  top: -80px;
  left: 12px;
  z-index: 200;
  display: inline-block;
  padding: 11px 18px;
  background: var(--neon-cyan);
  color: var(--ink-green);
  font-size: var(--step-1);
  font-weight: 800;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: top 0.18s ease;
}

.skip-link:focus {
  top: 12px;
}

/* ---------- 6. header（移动优先） ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--charcoal);
  border-bottom: 1px solid var(--line);
  color: var(--paper);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  max-width: var(--shell-max);
  margin-inline: auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  color: var(--paper);
  flex: 0 0 auto;
}

.brand__mark {
  display: inline-block;
  padding: 4px 6px;
  background: var(--neon-cyan);
  color: var(--ink-green);
  font-family: var(--font-num);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
}

.brand__name {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.22em;
  line-height: 1;
}

.brand:hover .brand__mark { background: var(--paper); }

/* 移动端开关 */
.nav-toggle {
  position: relative;
  z-index: 80;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  color: var(--paper);
  font-size: var(--step-1);
  font-weight: 700;
  letter-spacing: 0.12em;
  background: var(--charcoal);
}

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

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: background 0.2s ease;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform 0.24s ease;
}

.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }

/* 抽屉 */
.site-nav {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 50;
  width: min(340px, 86vw);
  padding: 78px 22px 30px;
  background: var(--ink-green);
  border-left: 1px solid var(--line);
  overflow-y: auto;
  transform: translateX(102%);
  transition: transform 0.3s cubic-bezier(0.3, 0.8, 0.3, 1);
  display: flex;
  flex-direction: column;
}

.site-nav[data-open] { transform: translateX(0); }

.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-nav__link {
  display: block;
  padding: 13px 12px;
  border-left: 2px solid transparent;
  color: var(--sage);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.05em;
  line-height: 1.4;
  text-decoration: none;
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

.site-nav__link:hover {
  color: var(--paper);
  background: rgba(47, 227, 200, 0.08);
  border-left-color: var(--line);
}

.site-nav__link[aria-current="page"] {
  color: var(--neon-cyan);
  border-left-color: var(--neon-cyan);
  background: rgba(47, 227, 200, 0.07);
}

.site-nav__tail {
  margin-top: auto;
  padding-top: 26px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-nav__cta {
  display: block;
  padding: 13px 10px;
  background: var(--neon-cyan);
  color: var(--ink-green);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-align: center;
  text-decoration: none;
  line-height: 1.35;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.site-nav__cta:hover { background: var(--paper); }

.site-nav__util {
  display: block;
  padding: 9px 10px;
  border: 1px solid var(--line);
  color: var(--sage);
  font-size: var(--step-1);
  letter-spacing: 0.1em;
  text-align: center;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.site-nav__util:hover { color: var(--paper); border-color: var(--neon-cyan); }

/* ---------- 7. header 桌面端轨道 ---------- */
@media (min-width: 960px) {
  body { padding-left: var(--rail-w); }

  .site-header {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    width: var(--rail-w);
    border-bottom: 0;
    border-right: 1px solid var(--line);
    display: flex;
  }

  .site-header__inner {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 18px;
    width: 100%;
    max-width: none;
    margin: 0;
    padding: 18px 9px 20px;
    height: 100%;
  }

  .brand {
    flex-direction: column;
    gap: 10px;
    align-items: center;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--line);
  }

  .brand__name {
    writing-mode: vertical-rl;
    letter-spacing: 0.3em;
    font-size: 14px;
  }

  .nav-toggle { display: none; }

  .site-nav {
    position: static;
    width: auto;
    transform: none;
    background: transparent;
    border-left: 0;
    padding: 0;
    overflow: visible;
    flex: 1 1 auto;
    min-height: 0;
  }

  .site-nav__list { gap: 2px; }

  .site-nav__link {
    padding: 9px 7px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.04em;
    line-height: 1.35;
    word-break: break-word;
  }

  .site-nav__tail { padding-top: 16px; gap: 8px; }

  .site-nav__cta {
    padding: 10px 5px;
    font-size: 12px;
    letter-spacing: 0.04em;
  }

  .site-nav__util {
    padding: 7px 4px;
    font-size: 11px;
    letter-spacing: 0.04em;
  }
}

@media (min-width: 1280px) {
  .site-nav__link { font-size: 13px; }
  .site-nav__cta { font-size: 13px; }
}

/* ---------- 8. footer ---------- */
.site-footer {
  position: relative;
  background: var(--charcoal);
  border-top: 1px solid var(--line);
  color: var(--paper);
}

.site-footer__inner {
  padding-block: 56px 30px;
}

.site-footer__top {
  display: grid;
  gap: 34px;
  grid-template-columns: minmax(0, 1fr);
}

.site-footer__logo {
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--paper);
}

.site-footer__logo span { color: var(--neon-cyan); }

.site-footer__tagline {
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--sage);
  max-width: 34ch;
}

.site-footer__nav {
  display: grid;
  gap: 30px;
  grid-template-columns: minmax(0, 1fr);
}

.site-footer__colTitle {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.24em;
  color: var(--neon-cyan);
  margin: 0;
}

.site-footer__list {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.site-footer__link {
  font-size: 14px;
  line-height: 1.5;
  color: rgba(242, 247, 245, 0.78);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.site-footer__link:hover {
  color: var(--neon-cyan);
  border-bottom-color: var(--neon-cyan);
}

.site-footer__contact {
  margin-top: 42px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.site-footer__contactLine {
  font-size: 13px;
  line-height: 1.7;
  color: var(--sage);
  letter-spacing: 0.03em;
}

.site-footer__meta {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 26px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--sage);
}

.site-footer__legal { color: var(--sage); }
.site-footer__copy { color: var(--sage); }

@media (min-width: 720px) {
  .site-footer__nav { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .site-footer__inner { padding-block: 72px 34px; }
  .site-footer__top { grid-template-columns: 1.35fr repeat(3, minmax(0, 1fr)); gap: 40px; }
  .site-footer__nav { grid-column: span 3; }
}

/* ---------- 9. 通用组件 ---------- */
.section {
  position: relative;
  padding-block: clamp(46px, 7vw, 92px);
}

.section__head {
  display: grid;
  gap: 10px;
  margin-bottom: 30px;
}

.section__num {
  font-family: var(--font-num);
  font-size: var(--step-1);
  letter-spacing: 0.3em;
  color: var(--neon-cyan);
  font-variant-numeric: tabular-nums;
}

.section__title {
  font-size: clamp(26px, 4.4vw, var(--step3));
  font-weight: 800;
  letter-spacing: -0.02em;
}

.section__lede {
  max-width: 40ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--sage);
}

.card {
  position: relative;
  display: block;
  background: var(--deep-green);
  border: 1px solid var(--line);
  padding: 20px;
  color: var(--paper);
  text-decoration: none;
  transition: transform 0.22s ease, border-color 0.22s ease, background-color 0.22s ease;
}

@media (hover: hover) {
  .card:hover {
    transform: translateY(-4px);
    border-color: var(--neon-cyan);
    background: #17392F;
  }
}

.card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--neon-cyan);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--line);
  color: var(--sage);
  font-family: var(--font-num);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  line-height: 1.4;
  white-space: nowrap;
}

.tag--live {
  color: var(--neon-cyan);
  border-color: rgba(47, 227, 200, 0.5);
  background: rgba(47, 227, 200, 0.1);
}

.tag--hot {
  color: var(--signal-orange);
  border-color: rgba(255, 106, 43, 0.5);
  background: rgba(255, 106, 43, 0.1);
}

.stat {
  display: block;
}

.stat__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(38px, 6.4vw, 64px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  color: var(--neon-cyan);
}

.stat__num--signal { color: var(--signal-orange); }
.stat__num--paper { color: var(--paper); }

.stat__label {
  display: block;
  margin-top: 9px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--sage);
}

.paper {
  position: relative;
  isolation: isolate;
  background: var(--paper);
  color: var(--charcoal);
  border: 1px solid var(--line);
  padding: clamp(20px, 3vw, 32px);
}

.paper::before {
  content: "";
  position: absolute;
  inset: 8px -8px -8px 8px;
  z-index: -1;
  background: var(--deep-green);
  border: 1px solid var(--line);
}

.paper h2,
.paper h3,
.paper h4 { color: var(--charcoal); }

.paper a { color: var(--orange-brown); }

.media {
  position: relative;
  display: block;
  width: 100%;
  background: var(--deep-green);
  border: 1px solid var(--line);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.media::before {
  content: "";
  display: block;
  padding-top: 56.25%;
}

.media > img,
.media > video,
.media > picture,
.media > .media__inner {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media > picture > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--tall::before { padding-top: 120%; }
.media--square::before { padding-top: 100%; }
.media--wide::before { padding-top: 42%; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 24px;
  border: 1px solid var(--neon-cyan);
  background: transparent;
  color: var(--neon-cyan);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.35;
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn:hover { background: var(--neon-cyan); color: var(--ink-green); }

.btn--solid {
  background: var(--neon-cyan);
  color: var(--ink-green);
}

.btn--solid:hover {
  background: var(--paper);
  border-color: var(--paper);
  color: var(--charcoal);
}

.btn--signal {
  border-color: var(--signal-orange);
  color: var(--signal-orange);
}

.btn--signal:hover {
  background: var(--signal-orange);
  border-color: var(--signal-orange);
  color: var(--charcoal);
}

.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--sage);
}

.crumbs__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

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

.crumbs__link {
  color: var(--sage);
  text-decoration: none;
  transition: color 0.18s ease;
}

.crumbs__link:hover { color: var(--neon-cyan); }

.crumbs__current { color: var(--paper); }

/* ---------- 10. 阅读进度条 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 3px;
  z-index: 90;
  pointer-events: none;
  background: rgba(37, 66, 58, 0.5);
}

.scroll-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, var(--neon-cyan) 0%, var(--signal-orange) 100%);
  transform: scaleY(0);
  transform-origin: 50% 0;
  will-change: transform;
}

/* ---------- 11. 显现与计数 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

.js [data-count] { font-variant-numeric: tabular-nums; }

/* ---------- 12. 响应式栅格 ---------- */
@media (min-width: 720px) {
  :root { --shell-pad: 32px; }

  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .grid { gap: 22px; }
}

@media (min-width: 1024px) {
  #main-content { scroll-margin-top: 24px; }

  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .grid { gap: 26px; }
}

/* ---------- 13. 动效偏好 ---------- */
@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;
  }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .card:hover { transform: none; }
  .card:focus-visible { transform: none; }
}