/* ============================================================
   /assets/site.css — 九州体育入口 共享外壳
   夜间赛场指挥台：深墨绿底 / 青柠信号 / 暖橙行动点 / 锐利直角
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 132px;
}

body { margin: 0; }
h1, h2, h3, h4, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; }
table { border-collapse: collapse; }

/* ---------- 2. tokens ---------- */
:root {
  --ink-950: #04120E;
  --ink-900: #071F18;
  --ink-800: #0B2A22;
  --ink-700: #103B2F;
  --lime-400: #C8FF3D;
  --lime-300: #DFFF7A;
  --orange-500: #FF8A3D;
  --orange-300: #FFB27A;
  --cream-100: #F7F2E7;
  --sage-300: #A9BFB5;
  --line-500: #2C4A40;
  --dim-400: #7D9A8E;

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

  --shell: 1240px;
  --gutter: clamp(16px, 4vw, 44px);
  --gap: clamp(16px, 2vw, 28px);
  --t-fast: 160ms;
  --t-mid: 240ms;
}

/* ---------- 3. base typography ---------- */
body {
  min-height: 100vh;
  background:
    radial-gradient(1100px 560px at 8% -12%, rgba(200, 255, 61, 0.07), transparent 62%),
    radial-gradient(900px 520px at 102% 0%, rgba(255, 138, 61, 0.06), transparent 58%),
    var(--ink-900);
  color: var(--cream-100);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  letter-spacing: 0.005em;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: condensed;
  line-height: 1.04;
  letter-spacing: -0.012em;
  color: var(--cream-100);
}

h1 { font-size: clamp(38px, 7vw, 88px); }
h2 { font-size: clamp(30px, 4.6vw, 56px); }
h3 { font-size: clamp(22px, 2.6vw, 32px); }
h4 { font-size: clamp(18px, 2vw, 24px); }

p { max-width: 34em; }

a { text-decoration-color: var(--line-500); }

::selection {
  background: var(--lime-400);
  color: var(--ink-950);
}

:where(a, button, summary, [tabindex], input, select, textarea):focus-visible {
  outline: 2px solid var(--lime-400);
  outline-offset: 3px;
}

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

.section {
  position: relative;
  padding-block: clamp(48px, 7vw, 96px);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}

.grid > .col-3  { grid-column: span 3; }
.grid > .col-4  { grid-column: span 4; }
.grid > .col-5  { grid-column: span 5; }
.grid > .col-6  { grid-column: span 6; }
.grid > .col-7  { grid-column: span 7; }
.grid > .col-8  { grid-column: span 8; }
.grid > .col-9  { grid-column: span 9; }
.grid > .col-12 { grid-column: span 12; }

.hairline {
  border: 0;
  height: 1px;
  background: var(--line-500);
  margin-block: clamp(24px, 4vw, 40px);
}

/* ---------- 5. type components ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--lime-400);
  text-transform: uppercase;
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--lime-400);
  flex: 0 0 auto;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: condensed;
  font-size: clamp(30px, 4.6vw, 56px);
  line-height: 1.02;
  letter-spacing: -0.014em;
}

.lede {
  max-width: 34em;
  margin-top: 16px;
  color: var(--sage-300);
  font-size: clamp(15px, 1.3vw, 18px);
  line-height: 1.72;
}

.mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--sage-300);
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

/* ---------- 6. buttons & tags ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 22px;
  border: 1px solid transparent;
  border-radius: 0;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--t-fast) ease, border-color var(--t-fast) ease,
              color var(--t-fast) ease, transform var(--t-fast) ease;
}
.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--orange-500);
  border-color: var(--orange-500);
  color: var(--ink-950);
}
.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--orange-300);
  border-color: var(--orange-300);
}

.btn--lime {
  background: var(--lime-400);
  border-color: var(--lime-400);
  color: var(--ink-950);
}
.btn--lime:hover,
.btn--lime:focus-visible {
  background: var(--lime-300);
  border-color: var(--lime-300);
}

.btn--ghost {
  background: transparent;
  border-color: var(--line-500);
  color: var(--cream-100);
}
.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--lime-400);
  color: var(--lime-400);
}

.btn--sm {
  padding: 9px 15px;
  font-size: 12px;
  letter-spacing: 0.1em;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--line-500);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  line-height: 1.5;
  color: var(--sage-300);
  white-space: nowrap;
}
.tag--lime {
  background: var(--lime-400);
  border-color: var(--lime-400);
  color: var(--ink-950);
}
.tag--orange {
  background: var(--orange-500);
  border-color: var(--orange-500);
  color: var(--ink-950);
}

/* ---------- 7. panels & media ---------- */
.panel {
  position: relative;
  background: var(--ink-800);
  border: 1px solid var(--line-500);
  padding: clamp(18px, 2.4vw, 28px);
}

.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--ink-800);
  border: 1px solid var(--line-500);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(4, 18, 14, 0) 42%, rgba(4, 18, 14, 0.78) 100%);
}
.media-frame--wide   { aspect-ratio: 16 / 9; }
.media-frame--band   { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall   { aspect-ratio: 3 / 4; }

/* ---------- 8. breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--dim-400);
}
.breadcrumb a {
  color: var(--sage-300);
  text-decoration: none;
  transition: color var(--t-fast) ease;
}
.breadcrumb a:hover { color: var(--lime-400); }
.breadcrumb__sep { color: var(--line-500); }
.breadcrumb [aria-current="page"] { color: var(--cream-100); }

/* ---------- 9. accordion ---------- */
.accordion {
  border-top: 1px solid var(--line-500);
}
.accordion__item {
  border-bottom: 1px solid var(--line-500);
}
.accordion__trigger {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 2px;
  font-family: var(--font-body);
  font-size: clamp(16px, 1.6vw, 18px);
  font-weight: 700;
  text-align: left;
  color: var(--cream-100);
  cursor: pointer;
  transition: color var(--t-fast) ease;
}
.accordion__trigger:hover { color: var(--lime-400); }
.accordion__trigger[aria-expanded="true"] { color: var(--lime-400); }
.accordion__sign {
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  position: relative;
  transition: transform var(--t-mid) ease;
}
.accordion__sign::before,
.accordion__sign::after {
  content: "";
  position: absolute;
  background: currentColor;
}
.accordion__sign::before { inset: 6px 0 auto 0; height: 2px; }
.accordion__sign::after  { inset: 0 auto 0 6px; width: 2px; }
.accordion__trigger[aria-expanded="true"] .accordion__sign { transform: rotate(45deg); }
.accordion__panel {
  padding: 0 2px 22px;
  color: var(--sage-300);
  font-size: 15.5px;
  line-height: 1.75;
}
.accordion__panel[hidden] { display: none; }

/* ---------- 10. header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: linear-gradient(180deg, var(--ink-950) 0%, var(--ink-900) 100%);
  border-bottom: 1px solid var(--line-500);
  transition: box-shadow var(--t-mid) ease;
}
.site-header[data-scrolled="true"] {
  box-shadow: 0 26px 44px -34px #000;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -120px;
  z-index: 120;
  padding: 10px 18px;
  background: var(--lime-400);
  color: var(--ink-950);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: top var(--t-fast) ease;
}
.skip-link:focus {
  top: 10px;
}

/* 顶部信号栏 */
.header-rail {
  background: var(--ink-950);
  border-bottom: 1px solid var(--line-500);
}
.header-rail__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.13em;
  color: var(--sage-300);
}
.rail-mark {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  max-width: none;
  white-space: nowrap;
}
.rail-dot {
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  background: var(--lime-400);
  box-shadow: 0 0 0 3px rgba(200, 255, 61, 0.16);
  animation: rail-pulse 2.8s ease-in-out infinite;
}
.rail-links {
  display: flex;
  align-items: center;
  gap: 20px;
}
.rail-link {
  color: var(--sage-300);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) ease, border-color var(--t-fast) ease;
}
.rail-link:hover,
.rail-link:focus-visible {
  color: var(--lime-400);
  border-bottom-color: var(--lime-400);
}

@keyframes rail-pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.32; }
}

/* 主导航条 */
.header-bar {
  position: relative;
}
.header-bar__inner {
  display: flex;
  align-items: center;
  gap: 24px;
  padding-block: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  text-decoration: none;
}
.brand__glyph {
  width: 34px;
  height: 34px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  padding-inline: 6px;
  background: var(--ink-800);
  border: 1px solid var(--line-500);
}
.brand__glyph i {
  display: block;
  height: 3px;
  background: var(--line-500);
  transition: transform var(--t-mid) ease;
}
.brand__glyph i:nth-child(1) { width: 100%; background: var(--lime-400); }
.brand__glyph i:nth-child(2) { width: 70%; background: var(--orange-500); }
.brand__glyph i:nth-child(3) { width: 42%; background: var(--sage-300); }
.brand:hover .brand__glyph i:nth-child(3) { transform: translateX(4px); }

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.brand__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: condensed;
  font-size: 19px;
  letter-spacing: 0.02em;
  color: var(--cream-100);
}
.brand__tagline {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--dim-400);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 8px 12px;
  border: 1px solid var(--line-500);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cream-100);
  cursor: pointer;
  transition: border-color var(--t-fast) ease, color var(--t-fast) ease;
}
.nav-toggle:hover { border-color: var(--lime-400); color: var(--lime-400); }
.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}
.nav-toggle__bars i {
  display: block;
  height: 2px;
  background: var(--lime-400);
  transition: transform var(--t-fast) ease, opacity var(--t-fast) ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}
.nav-link {
  position: relative;
  display: inline-block;
  padding: 9px 11px;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--sage-300);
  text-decoration: none;
  transition: color var(--t-fast) ease;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 11px;
  right: 11px;
  bottom: 4px;
  height: 1px;
  background: var(--lime-400);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t-fast) ease;
}
.nav-link:hover,
.nav-link:focus-visible { color: var(--cream-100); }
.nav-link:hover::after,
.nav-link:focus-visible::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: var(--lime-400); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); }

.nav-cta { flex: 0 0 auto; }

/* 滚动进度光带 */
.scroll-meter {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: transparent;
}
.scroll-meter i {
  display: block;
  height: 100%;
  width: calc(var(--progress, 0) * 100%);
  background: linear-gradient(90deg, var(--lime-400), var(--orange-500));
  transition: width 120ms linear;
}

/* ---------- 11. footer ---------- */
.site-footer {
  position: relative;
  background: var(--ink-950);
  border-top: 1px solid var(--line-500);
  color: var(--sage-300);
}
.footer-ruler {
  height: 12px;
  border-bottom: 1px solid var(--line-500);
  background-image: repeating-linear-gradient(
    90deg,
    var(--line-500) 0 1px,
    transparent 1px 48px
  );
}
.footer-top {
  padding-block: clamp(38px, 6vw, 72px) 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: minmax(240px, 1.5fr) repeat(3, minmax(0, 1fr));
  gap: clamp(24px, 3vw, 48px);
}
.footer-brand { max-width: 360px; }
.footer-mark {
  display: flex;
  gap: 4px;
  margin-bottom: 18px;
}
.footer-mark i {
  display: block;
  height: 4px;
  background: var(--line-500);
}
.footer-mark i:nth-child(1) { width: 40px; background: var(--lime-400); }
.footer-mark i:nth-child(2) { width: 26px; background: var(--orange-500); }
.footer-mark i:nth-child(3) { width: 12px; background: var(--sage-300); }

.footer-name {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: condensed;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.05;
  letter-spacing: 0.01em;
  color: var(--cream-100);
}
.footer-summary {
  margin-top: 12px;
  max-width: 30ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--sage-300);
}

.footer-col__title {
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-500);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--lime-400);
}
.footer-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.footer-link {
  display: inline-block;
  font-size: 14.5px;
  color: var(--sage-300);
  text-decoration: none;
  transition: color var(--t-fast) ease, padding-left var(--t-fast) ease;
}
.footer-link:hover,
.footer-link:focus-visible {
  color: var(--cream-100);
  padding-left: 5px;
}

.footer-lines {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-line {
  margin: 0;
  max-width: none;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--sage-300);
  word-break: break-word;
}
.footer-line--note {
  padding-left: 10px;
  border-left: 1px solid var(--line-500);
  font-size: 12.5px;
  color: var(--dim-400);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  margin-top: clamp(30px, 5vw, 56px);
  padding-block: 18px 26px;
  border-top: 1px solid var(--line-500);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--dim-400);
}
.footer-legal,
.footer-copy,
.footer-fine {
  margin: 0;
  max-width: none;
  font-family: inherit;
  font-size: inherit;
  letter-spacing: inherit;
}
.footer-fine { color: #6B877C; }

/* ---------- 12. reveal ---------- */
[data-reveal] {
  opacity: 1;
  transform: none;
}
html[data-reveal-ready] [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 520ms ease, transform 520ms cubic-bezier(0.2, 0.7, 0.3, 1);
}
html[data-reveal-ready] [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 13. responsive ---------- */
@media (max-width: 1040px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-left: 0;
    padding: 6px var(--gutter) 20px;
    background: var(--ink-950);
    border-top: 1px solid var(--line-500);
    border-bottom: 1px solid var(--line-500);
    box-shadow: 0 28px 48px -28px #000;
    max-height: calc(100vh - 96px);
    overflow-y: auto;
  }
  .site-nav[data-open] { display: flex; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .nav-list > li { border-bottom: 1px solid var(--line-500); }
  .nav-link {
    display: block;
    padding: 14px 2px;
    font-size: 17px;
    color: var(--cream-100);
  }
  .nav-link::after { display: none; }
  .nav-link[aria-current="page"] {
    color: var(--lime-400);
    border-left: 2px solid var(--lime-400);
    padding-left: 12px;
  }
  .nav-cta {
    width: 100%;
    margin-top: 16px;
    padding-block: 14px;
  }

  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .footer-brand { max-width: none; grid-column: span 2; }
}

@media (max-width: 900px) {
  .grid > [class^="col-"] { grid-column: span 12; }
  .grid { gap: 20px; }
}

@media (max-width: 720px) {
  html { scroll-padding-top: 112px; }
  body { font-size: 16px; }
  .brand__tagline { display: none; }
  .header-bar__inner { gap: 14px; padding-block: 10px; }
  .header-rail__inner { font-size: 10px; letter-spacing: 0.1em; }
  .rail-links { gap: 14px; }
  .header-rail__inner { justify-content: flex-end; }
  .rail-mark { display: none; }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

@media (max-width: 560px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-brand { grid-column: span 1; }
  .btn { padding: 12px 18px; }
}

/* ---------- 14. motion preferences ---------- */
@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;
  }
  .rail-dot { animation: none; }
  html[data-reveal-ready] [data-reveal] {
    opacity: 1;
    transform: none;
  }
}