/* ===========================================================
   长城体育赛场 — 共享样式 /assets/site.css
   夜场战术板 · 悬浮胶囊浮岛 · 橙蓝对撞 · 编号索引
   =========================================================== */

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

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

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

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

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

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

a {
  color: var(--linkblue);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

/* ---------- 2. Tokens ---------- */
:root {
  --ink: #10161C;
  --stand: #1D252D;
  --concrete: #46515B;
  --silver: #A7B0B8;
  --light: #F4F1E8;
  --paper: #E9E4D8;
  --flame: #FF6B2C;
  --night: #2F6BFF;
  --linkblue: #8FB0FF;
  --turf: #3FA66B;
  --alert: #E5484D;

  --ink-rgb: 16, 22, 28;
  --stand-rgb: 29, 37, 45;
  --light-rgb: 244, 241, 232;
  --silver-rgb: 167, 176, 184;
  --flame-rgb: 255, 107, 44;
  --night-rgb: 47, 107, 255;
  --turf-rgb: 63, 166, 107;

  --font-display: "Barlow Condensed", "Archivo Narrow", "HarmonyOS Sans SC",
    "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei",
    "Helvetica Neue", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace,
    SFMono-Regular, Menlo, Consolas, monospace;

  --edge: 1px solid rgba(var(--silver-rgb), .18);
  --edge-strong: 1px solid rgba(var(--silver-rgb), .32);
  --cut: 16px;
  --pill: 999px;
  --shadow-island: 0 20px 44px -26px rgba(0, 0, 0, .96);
  --ease: cubic-bezier(.4, .1, .2, 1);
}

/* ---------- 3. Base ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    radial-gradient(58vw 58vh at 90% -12%, rgba(var(--night-rgb), .16), transparent 70%),
    radial-gradient(52vw 52vh at 2% -4%, rgba(var(--flame-rgb), .10), transparent 68%);
  background-repeat: no-repeat;
  background-attachment: fixed;
  color: var(--light);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -.02em;
}

p { text-wrap: pretty; }

::selection {
  background: rgba(var(--flame-rgb), .38);
  color: var(--light);
}

:focus-visible {
  outline: 3px solid var(--flame);
  outline-offset: 3px;
  border-radius: 4px;
}

main { padding-block-start: clamp(96px, 11vh, 132px); }

#main-content { scroll-margin-top: 120px; }

/* ---------- 4. Utilities ---------- */
.wrap {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 36px);
}

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

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: .7em 1.2em;
  border-radius: var(--pill);
  background: var(--flame);
  color: #14181B;
  font-weight: 700;
  font-size: .9rem;
  text-decoration: none;
  transform: translateY(-170%);
  transition: transform .18s var(--ease);
}

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

.rule {
  height: 1px;
  border: 0;
  background: rgba(var(--silver-rgb), .16);
  margin-block: clamp(20px, 3vw, 34px);
}

.mono {
  font-family: var(--font-mono);
  letter-spacing: .02em;
  font-variant-numeric: tabular-nums;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: .6em;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .22em;
  color: var(--silver);
  text-transform: uppercase;
}

.kicker::before {
  content: "";
  width: 11px;
  height: 11px;
  background: var(--flame);
  clip-path: polygon(0 0, 100% 0, 100% 100%);
}

.section-index {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 900;
  line-height: .9;
  letter-spacing: -.03em;
  color: var(--flame);
  font-variant-numeric: tabular-nums;
}

.lede {
  max-width: 44ch;
  font-size: clamp(1rem, 1.3vw, 1.14rem);
  line-height: 1.8;
  color: var(--silver);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: .4em;
  padding: .22em .72em;
  border-radius: var(--pill);
  border: 1px solid rgba(var(--night-rgb), .5);
  color: var(--linkblue);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: .45em;
  padding: .42em .95em;
  border-radius: var(--pill);
  border: 1px solid rgba(var(--silver-rgb), .3);
  background: transparent;
  color: var(--silver);
  font-size: .86rem;
  font-weight: 600;
  letter-spacing: .04em;
  cursor: pointer;
  transition: color .16s var(--ease), border-color .16s var(--ease),
    background-color .16s var(--ease);
}

.chip:hover { color: var(--light); border-color: var(--silver); }

.chip[aria-pressed="true"] {
  background: rgba(var(--flame-rgb), .14);
  border-color: var(--flame);
  color: var(--flame);
}

/* ---------- 5. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5em;
  padding: .62em 1.15em;
  border: 1px solid transparent;
  border-radius: var(--pill);
  font-family: var(--font-body);
  font-size: .9rem;
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .18s var(--ease), color .18s var(--ease),
    border-color .18s var(--ease), transform .18s var(--ease);
}

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

.btn--primary {
  background: var(--flame);
  color: #14181B;
  box-shadow: 0 10px 24px -16px rgba(var(--flame-rgb), .95);
}

.btn--primary:hover { background: #FF8347; }

.btn--ghost {
  background: transparent;
  border-color: rgba(var(--silver-rgb), .4);
  color: var(--light);
}

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

.btn--line {
  background: transparent;
  border-color: rgba(var(--night-rgb), .55);
  color: var(--linkblue);
}

.btn--line:hover {
  border-color: var(--linkblue);
  background: rgba(var(--night-rgb), .16);
}

/* ---------- 6. Header / 悬浮胶囊浮岛 ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 90;
  padding: 12px clamp(10px, 2.5vw, 26px) 0;
  pointer-events: none;
}

.header-shell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 1264px;
  margin-inline: auto;
  pointer-events: auto;
}

.island {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 26px);
  padding: 9px 10px 9px 14px;
  border-radius: var(--pill);
  background: rgba(23, 30, 37, .92);
  border: 1px solid rgba(var(--silver-rgb), .2);
  box-shadow: var(--shadow-island);
  backdrop-filter: blur(16px) saturate(1.25);
  -webkit-backdrop-filter: blur(16px) saturate(1.25);
  transition: padding .24s var(--ease), background-color .24s var(--ease),
    border-color .24s var(--ease);
}

.site-header[data-collapsed="true"] .island {
  padding-block: 5px;
  background: rgba(16, 22, 28, .96);
  border-color: rgba(var(--flame-rgb), .3);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  color: var(--light);
  text-decoration: none;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  background: linear-gradient(145deg, var(--flame), #FF9457);
  color: #14181B;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 900;
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, 100% 62%, 62% 100%, 0 100%);
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  line-height: 1.15;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 1.04rem;
  font-weight: 800;
  letter-spacing: .04em;
  color: var(--light);
}

.brand__line {
  font-size: .66rem;
  letter-spacing: .14em;
  color: var(--silver);
  max-height: 1.4em;
  overflow: hidden;
  transition: opacity .2s var(--ease), max-height .2s var(--ease);
}

.site-header[data-collapsed="true"] .brand__line {
  opacity: 0;
  max-height: 0;
}

/* 导航 */
.nav { margin-inline: auto; }

.nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0px, .4vw, 6px);
}

.nav__link {
  position: relative;
  display: inline-block;
  padding: .42em .78em;
  border-radius: var(--pill);
  color: var(--silver);
  font-size: .9rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-decoration: none;
  white-space: nowrap;
  transition: color .16s var(--ease), background-color .16s var(--ease);
}

.nav__link:hover {
  color: var(--light);
  background: rgba(var(--silver-rgb), .12);
}

.nav__link[aria-current="page"] {
  color: var(--flame);
  background: rgba(var(--flame-rgb), .13);
}

.nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: .16em;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: var(--flame);
  transform: translateX(-50%);
}

/* 动作区 */
.island__actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

.island__hint { font-size: .82rem; padding: .5em .95em; }

.site-header[data-collapsed="true"] .island__hint { display: none; }

.island__cta { font-size: .84rem; padding: .52em 1.05em; }

/* 移动开关 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: .5em .85em;
  border: 1px solid rgba(var(--silver-rgb), .4);
  border-radius: var(--pill);
  background: transparent;
  color: var(--light);
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .1em;
  cursor: pointer;
  transition: border-color .16s var(--ease), color .16s var(--ease);
}

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

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 16px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .18s var(--ease), opacity .18s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child {
  transform: translateY(3px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child {
  transform: translateY(-3px) rotate(-45deg);
}

.nav-toggle__label { line-height: 1; }

/* 滚动进度 */
.scroll-progress {
  height: 2px;
  width: 100%;
  border-radius: 2px;
  background: rgba(var(--silver-rgb), .16);
  overflow: hidden;
}

.scroll-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--flame), var(--night));
  transition: width .12s linear;
}

/* ---------- 7. Footer ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 10vh, 120px);
  background: linear-gradient(180deg, #151C23 0%, #10161C 62%);
  border-top: 1px solid rgba(var(--silver-rgb), .14);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--flame), var(--night) 48%, transparent 92%);
}

.footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1.6fr) minmax(0, .95fr);
  gap: clamp(22px, 4vw, 56px);
  padding-block: clamp(40px, 6vw, 72px) clamp(26px, 4vw, 44px);
}

.footer__brand { min-width: 0; }

.footer__eyebrow {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .22em;
  color: var(--silver);
  text-transform: uppercase;
}

.footer__wordmark {
  margin-top: 10px;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--light);
}

.footer__intro {
  max-width: 32ch;
  margin-top: 12px;
  font-size: .95rem;
  line-height: 1.7;
  color: var(--silver);
}

.footer__cta { margin-top: 20px; }

.footer__nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 36px);
}

.footer__col { min-width: 0; }

.footer__col-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .2em;
  color: var(--flame);
  text-transform: uppercase;
}

.footer__list {
  display: grid;
  gap: 9px;
}

.footer__link {
  display: inline-block;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  color: var(--light);
  font-size: .94rem;
  text-decoration: none;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.footer__link:hover {
  color: var(--linkblue);
  border-bottom-color: var(--linkblue);
}

.footer__contact { min-width: 0; }

.footer__row {
  display: grid;
  gap: 2px;
  padding-block: 10px;
  border-top: 1px solid rgba(var(--silver-rgb), .12);
}

.footer__row:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.footer__key {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  color: var(--silver);
}

.footer__value {
  color: var(--light);
  font-size: .94rem;
  word-break: break-word;
}

.footer__value--mono { font-family: var(--font-mono); letter-spacing: .02em; }

.footer__value--text { font-family: var(--font-body); line-height: 1.6; }

.footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px 28px;
  padding-block: 18px clamp(24px, 3vw, 32px);
  border-top: 1px solid rgba(var(--silver-rgb), .12);
}

.footer__fine {
  max-width: 62ch;
  font-size: .8rem;
  line-height: 1.7;
  color: var(--silver);
}

.footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .04em;
  color: var(--silver);
}

.footer__legal-item { white-space: nowrap; }

/* ---------- 8. Panels / Breadcrumb / Media / Grid ---------- */
.panel {
  background: var(--stand);
  border: var(--edge);
  border-radius: 6px;
  padding: clamp(18px, 2.4vw, 30px);
}

.panel--cut {
  border: 0;
  border-radius: 0;
  background: linear-gradient(160deg, #232C35, #1A222A);
  box-shadow: 0 24px 50px -34px rgba(0, 0, 0, .95);
  clip-path: polygon(
    0 0,
    calc(100% - var(--cut)) 0,
    100% var(--cut),
    100% 100%,
    0 100%
  );
}

.breadcrumb { font-size: .82rem; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5em;
  font-family: var(--font-mono);
  letter-spacing: .06em;
  color: var(--silver);
}

.breadcrumb__list li + li::before {
  content: "/";
  margin-right: .5em;
  color: var(--concrete);
}

.breadcrumb__list a {
  color: var(--silver);
  text-decoration: none;
}

.breadcrumb__list a:hover { color: var(--flame); }

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

.media {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: #161E25;
  border: var(--edge);
  clip-path: polygon(
    0 0,
    calc(100% - 22px) 0,
    100% 22px,
    100% 100%,
    0 100%
  );
}

.media > img,
.media > svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--wide { aspect-ratio: 16 / 9; }
.media--tall { aspect-ratio: 4 / 5; }
.media--square { aspect-ratio: 1 / 1; }
.media--band { aspect-ratio: 21 / 9; }

.media__placeholder {
  display: grid;
  place-items: center;
  height: 100%;
  min-height: 120px;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .18em;
  color: var(--silver);
  text-align: center;
  background-image: repeating-linear-gradient(
    135deg,
    rgba(var(--silver-rgb), .1) 0 1px,
    transparent 1px 14px
  );
}

.media figcaption {
  position: absolute;
  inset: auto 0 0 0;
  padding: .6em .85em;
  font-size: .75rem;
  color: var(--light);
  background: linear-gradient(0deg, rgba(var(--ink-rgb), .94), transparent);
}

.grid {
  display: grid;
  gap: clamp(18px, 2.6vw, 32px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.grid--split-rev { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }

/* ---------- 9. Reveal ---------- */
.reveal-armed [data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}

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

/* ---------- 10. Responsive ---------- */
@keyframes nav-drop {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 1024px) {
  .footer__inner { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .footer__brand { grid-column: 1 / -1; }
  .footer__intro { max-width: 46ch; }
}

@media (max-width: 900px) {
  .island {
    flex-wrap: wrap;
    row-gap: 6px;
    border-radius: 22px;
    padding: 10px 12px;
  }

  .brand { margin-right: auto; }

  .nav {
    order: 3;
    flex: 1 1 100%;
    display: none;
    margin-inline: 0;
  }

  .nav[data-open] {
    display: block;
    animation: nav-drop .2s var(--ease);
  }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    margin-top: 6px;
    padding-top: 6px;
    border-top: 1px solid rgba(var(--silver-rgb), .16);
  }

  .nav__link {
    display: block;
    padding: .7em .8em;
    font-size: 1rem;
    border-radius: 10px;
  }

  .nav__link[aria-current="page"]::after {
    left: .8em;
    bottom: .5em;
    transform: none;
  }

  .island__hint { display: none; }

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

  .scroll-progress { display: none; }

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

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

@media (max-width: 640px) {
  body { font-size: .98rem; }

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

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

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

@media (max-width: 420px) {
  .island__cta { padding: .5em .8em; font-size: .8rem; }
  .brand__line { display: none; }
}

/* ---------- 11. Motion preference ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

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

  .btn:hover { transform: none; }
}