/* =========================================================
   小鸟体育看台 /assets/site.css
   夜场看台视觉语言：深蓝夜空、草皮绿分区、荧光黄绿高亮
   ========================================================= */

/* ---------- 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, figure, blockquote, dl, dd {
  margin: 0;
}

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

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

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

a { color: inherit; }

/* ---------- 2. Tokens ---------- */
:root {
  --navy: #0B1B2B;
  --navy-2: #122A3F;
  --navy-3: #0E2335;
  --grass: #1F7A4D;
  --lime: #C8FF3D;
  --ember: #FF5A36;
  --paper: #F4EBD8;
  --ink: #241A12;
  --fog: #F2F6F4;
  --steel: #8FA3B0;
  --amber: #FFB627;

  --line: rgba(143, 163, 176, 0.22);
  --line-soft: rgba(143, 163, 176, 0.14);
  --lime-soft: rgba(200, 255, 61, 0.45);
  --lime-ghost: rgba(200, 255, 61, 0.07);

  --font-display: "Helvetica Neue", "Arial Narrow", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", "DIN Alternate", Menlo, Consolas, monospace;

  --wrap: 1200px;
  --gutter: clamp(16px, 4vw, 48px);
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;
  --dur: 180ms;
  --ease: cubic-bezier(0.32, 0.72, 0.28, 1);
  --lift: 0 20px 44px -26px rgba(0, 0, 0, 0.95);
}

/* ---------- 3. Base / 中文排版 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--fog);
  background-color: var(--navy);
  background-image:
    radial-gradient(1100px 520px at 82% -8%, rgba(31, 122, 77, 0.30), transparent 62%),
    radial-gradient(820px 460px at 4% 2%, rgba(18, 42, 63, 0.95), transparent 58%);
  background-repeat: no-repeat;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* 扫描线覆盖层 */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 5;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(242, 246, 244, 0.035) 0 1px,
    transparent 1px 4px
  );
  opacity: 0.6;
}

main { display: block; }

#main-content:focus { outline: none; }
#main-content { scroll-margin-top: 24px; }

p { line-height: 1.75; }

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

/* ---------- 4. 焦点 ---------- */
:where(a, button, [tabindex]):focus-visible {
  outline: 3px solid var(--lime);
  outline-offset: 2px;
  border-radius: 4px;
  box-shadow: 0 0 0 6px rgba(36, 26, 18, 0.9);
}

/* ---------- 5. 容器与通用布局 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: clamp(36px, 6.5vw, 80px);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 2.4vw, 28px);
}

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(238px, 1fr)); }

/* ---------- 6. 文字层级 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--lime);
}

.eyebrow::before {
  content: "";
  width: 20px;
  height: 2px;
  background: currentColor;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4vw, 40px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.lede {
  max-width: 62ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 7. 数字与标签 ---------- */
.numeric {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.score {
  font-family: var(--font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 5vw, 46px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ember);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--lime);
  background: var(--lime-ghost);
  white-space: nowrap;
}

.tag--amber { color: var(--amber); background: rgba(255, 182, 39, 0.08); }
.tag--ember { color: var(--ember); background: rgba(255, 90, 54, 0.10); }

/* ---------- 8. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 24px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: transform var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              color var(--dur) var(--ease);
}

.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background: var(--lime);
  color: var(--ink);
  box-shadow: 0 14px 26px -18px rgba(200, 255, 61, 0.9);
}

.btn--primary:hover { background: #d6ff68; }

.btn--ghost {
  border-color: var(--lime-soft);
  color: var(--lime);
  background: var(--lime-ghost);
}

.btn--ghost:hover {
  background: rgba(200, 255, 61, 0.16);
  border-color: var(--lime);
}

.btn--quiet {
  border-color: var(--line);
  color: var(--fog);
  background: rgba(18, 42, 63, 0.6);
}

.btn--quiet:hover {
  border-color: rgba(200, 255, 61, 0.4);
  color: var(--lime);
}

/* ---------- 9. 卡片 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 3vw, 28px);
  background: var(--navy-2);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  transition: transform var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--lime-soft);
  box-shadow: var(--lift);
}

.card--paper {
  background: var(--paper);
  color: var(--ink);
  border-color: rgba(36, 26, 18, 0.16);
  border-radius: 4px var(--r-md) 4px var(--r-md);
}

.card--paper:hover { border-color: rgba(31, 122, 77, 0.6); }

/* ---------- 10. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background-color: var(--navy-2);
  background-image: linear-gradient(145deg, var(--navy-3) 0%, var(--grass) 100%);
}

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

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(11, 27, 43, 0.16) 0 1px,
    transparent 1px 3px
  );
}

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

/* ---------- 11. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 16px 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
}

.breadcrumb a {
  color: var(--steel);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.breadcrumb a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime-soft);
}

.breadcrumb__sep { opacity: 0.45; }
.breadcrumb [aria-current="page"] { color: var(--fog); }

/* ---------- 12. 跳转链接与进度条 ---------- */
.skip-link {
  position: absolute;
  top: 0;
  left: 50%;
  z-index: 120;
  transform: translate(-50%, -160%);
  padding: 10px 20px;
  background: var(--lime);
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  border-radius: 0 0 12px 12px;
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus { transform: translate(-50%, 0); }

.progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: 3px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--grass) 0%, var(--lime) 62%, var(--amber) 100%);
  pointer-events: none;
}

/* ---------- 13. 页头 ---------- */
.site-header {
  position: relative;
  z-index: 30;
}

.status-strip {
  background: var(--navy-2);
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.status-strip__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 6px 18px;
  min-height: 36px;
  padding-block: 7px;
}

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

.status-strip__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(200, 255, 61, 0.14);
  flex: none;
}

.status-strip__item--muted { color: rgba(143, 163, 176, 0.78); }

.masthead {
  background: linear-gradient(180deg, rgba(18, 42, 63, 0.9) 0%, rgba(11, 27, 43, 0.35) 100%);
  border-bottom: 1px solid var(--line-soft);
}

.masthead__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding-block: 26px 18px;
  text-align: center;
}

.brand {
  position: relative;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding-top: 14px;
  text-decoration: none;
}

.brand::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  width: 56px;
  height: 2px;
  background: var(--lime);
  transform: translateX(-50%);
  transition: width var(--dur) var(--ease);
}

.brand:hover::before { width: 104px; }

.brand__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: condensed;
  font-size: clamp(26px, 5vw, 42px);
  line-height: 1.05;
  letter-spacing: 0.06em;
  color: var(--fog);
}

.brand__name em {
  font-style: normal;
  color: var(--lime);
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--steel);
}

.masthead__meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(143, 163, 176, 0.85);
}

/* 栏目索引栏 */
.nav-rail {
  background: var(--navy-2);
  border-top: 1px solid rgba(200, 255, 61, 0.16);
  border-bottom: 1px solid var(--line);
}

.nav-rail__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: clamp(2px, 1.4vw, 20px);
}

.nav-list__item { display: flex; }

.nav-list a {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 14px 8px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--steel);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.nav-list a:hover { color: var(--fog); }

.nav-list__num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: rgba(143, 163, 176, 0.7);
  transition: color var(--dur) var(--ease);
}

.nav-list a[aria-current="page"] { color: var(--lime); }

.nav-list a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 8px;
  right: 8px;
  bottom: 6px;
  height: 2px;
  background: var(--lime);
  border-radius: 2px;
}

.nav-list a[aria-current="page"] .nav-list__num { color: var(--amber); }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  border: 1px solid var(--lime-soft);
  border-radius: 999px;
  background: var(--lime-ghost);
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav-toggle:hover {
  background: rgba(200, 255, 61, 0.15);
  border-color: var(--lime);
}

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
  width: 16px;
  flex: none;
}

.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.nav-rail[data-open] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-rail[data-open] .nav-toggle__bars span:nth-child(1) { transform: translateY(4.5px) rotate(45deg); }
.nav-rail[data-open] .nav-toggle__bars span:nth-child(3) { transform: translateY(-4.5px) rotate(-45deg); }

/* ---------- 14. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 96px);
  padding-top: clamp(32px, 5vw, 56px);
  background: linear-gradient(180deg, rgba(18, 42, 63, 0.62) 0%, var(--navy) 48%);
  border-top: 1px solid rgba(200, 255, 61, 0.2);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--lime) 0 14px,
    transparent 14px 28px
  );
  opacity: 0.45;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.3fr 1fr;
  gap: clamp(20px, 3vw, 44px);
  padding-bottom: clamp(28px, 4vw, 48px);
}

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

.foot-brand {
  font-family: var(--font-display);
  font-weight: 900;
  font-stretch: condensed;
  font-size: 22px;
  letter-spacing: 0.06em;
  color: var(--fog);
}

.foot-brand__sub {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--lime);
}

.foot-brand__note {
  margin-top: 14px;
  max-width: 36ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel);
}

.foot-col__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--amber);
}

.foot-col__toggle {
  display: none;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fog);
  text-align: left;
}

.foot-col__sign {
  position: relative;
  width: 12px;
  height: 12px;
  flex: none;
}

.foot-col__sign::before,
.foot-col__sign::after {
  content: "";
  position: absolute;
  background: var(--lime);
}

.foot-col__sign::before {
  left: 0;
  right: 0;
  top: 50%;
  height: 1.5px;
  transform: translateY(-50%);
}

.foot-col__sign::after {
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1.5px;
  transform: translateX(-50%);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.foot-col[data-open] .foot-col__sign::after {
  transform: translateX(-50%) scaleY(0);
  opacity: 0;
}

.foot-col__panel { display: block; }

.foot-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 14.5px;
  line-height: 1.6;
}

.foot-list a {
  color: var(--steel);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.foot-list a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime-soft);
}

.foot-list--contact { gap: 14px; }

.foot-label {
  display: block;
  margin-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(143, 163, 176, 0.72);
}

.foot-value {
  display: block;
  color: var(--fog);
  font-size: 14px;
  line-height: 1.65;
  word-break: break-word;
}

.foot-meta {
  margin-top: 14px;
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(143, 163, 176, 0.8);
}

.footer-base {
  border-top: 1px solid var(--line);
  padding-block: 18px 22px;
}

.footer-base__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.footer-base__copy { color: var(--steel); }
.footer-base__icp { color: rgba(242, 246, 244, 0.8); }

/* 回到顶部 */
.to-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid var(--lime-soft);
  border-radius: 999px;
  background: rgba(11, 27, 43, 0.92);
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--dur) var(--ease),
              transform var(--dur) var(--ease),
              visibility var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}

.to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover { background: rgba(18, 42, 63, 0.98); }

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1000px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 26px 32px;
  }
  .foot-col--brand { grid-column: 1 / -1; }
}

@media (max-width: 880px) {
  .nav-rail__inner {
    flex-direction: column;
    align-items: stretch;
    justify-content: center;
  }

  .nav-toggle {
    display: inline-flex;
    align-self: center;
    margin-block: 12px;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-bottom: 6px;
  }

  .nav-rail[data-open] .nav-list {
    display: flex;
    animation: navFade 180ms var(--ease) both;
  }

  .nav-list__item { border-top: 1px solid var(--line-soft); }

  .nav-list a {
    justify-content: flex-start;
    padding: 14px 2px;
    font-size: 15.5px;
  }

  .nav-list a[aria-current="page"]::after {
    left: 2px;
    right: auto;
    width: 24px;
    bottom: 9px;
  }
}

@keyframes navFade {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

@media (max-width: 720px) {
  body { font-size: 15px; }

  .status-strip__inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 4px;
    padding-block: 9px;
  }

  .masthead__inner { padding-block: 20px 14px; gap: 10px; }
  .masthead__meta { font-size: 10px; letter-spacing: 0.14em; gap: 8px; }

  .footer-grid { grid-template-columns: 1fr; gap: 0; }

  .foot-col--brand { padding-bottom: 22px; }

  .foot-col__title { display: none; }
  .foot-col__toggle { display: flex; }
  .foot-col__panel { display: none; }
  .foot-col[data-open] .foot-col__panel {
    display: block;
    padding-bottom: 18px;
  }

  .footer-base__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .to-top { right: 12px; bottom: 12px; }
}

@media (max-width: 480px) {
  .brand__sub { letter-spacing: 0.24em; font-size: 10px; }
  .btn { padding: 11px 20px; font-size: 14.5px; }
  .status-strip { font-size: 10.5px; }
}

/* ---------- 16. 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;
  }

  .card:hover,
  .btn:hover { transform: none; }
}