/* ===== 德信体育看台 · shared site kit ===== */

*,
*::before,
*::after { box-sizing: border-box; }

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

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

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

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

button { font: inherit; color: inherit; }

:root {
  --ink: #06120F;
  --ink-2: #0C201B;
  --ink-3: #081915;
  --line: #1E3A32;
  --lime: #C6FF3D;
  --lime-dim: #8FBF1F;
  --orange: #FF8A3D;
  --paper: #EAF2EE;
  --muted: #9FB5AC;
  --on-lime: #04100C;
  --snow: #FFFFFF;

  --cut: 18px;
  --tilt: 8deg;

  --font-serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --font-sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-narrow: "Roboto Condensed", "Arial Narrow", "PingFang SC", "Noto Sans SC", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --shell: 1320px;
  --gutter: 24px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

html { background: var(--ink); }

body {
  min-height: 100%;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  color: var(--paper);
  background:
    radial-gradient(1100px 460px at 50% -140px, rgba(198, 255, 61, 0.10), rgba(198, 255, 61, 0) 72%),
    var(--ink);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

#main-content {
  display: block;
  scroll-margin-top: 104px;
}

/* ---------- skip link ---------- */

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--lime);
  color: var(--on-lime);
  font-family: var(--font-narrow);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform 0.2s var(--ease);
}

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

/* ---------- header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(6, 18, 15, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(6px);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background:
    linear-gradient(90deg,
      var(--lime) 0,
      var(--lime) 96px,
      var(--orange) 96px,
      var(--orange) 120px,
      var(--line) 120px,
      var(--line) 100%);
}

.header-inner {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 14px var(--gutter);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  grid-template-areas: "brand nav actions";
  align-items: center;
  gap: 20px;
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
  transition: padding 0.22s var(--ease);
}

.brand {
  grid-area: brand;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--paper);
  text-decoration: none;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: none;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-bottom-color: var(--lime-dim);
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  transition: width 0.22s var(--ease), height 0.22s var(--ease), font-size 0.22s var(--ease);
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.brand__name {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.2;
  color: var(--paper);
}

.brand__note {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  line-height: 1.2;
  color: var(--muted);
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  grid-area: toggle;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
}

.nav-toggle__bars {
  display: grid;
  gap: 3px;
  width: 16px;
  flex: none;
}

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

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

.site-header[data-open] .nav-toggle__bars span:nth-child(1) { transform: translateY(5px) 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(-5px) rotate(-45deg); }

.primary-nav {
  grid-area: nav;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
}

.nav-item { display: block; }

.nav-link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 8px;
  border: 1px solid transparent;
  color: var(--muted);
  text-decoration: none;
  font-family: var(--font-narrow);
  font-size: 13.5px;
  letter-spacing: 0.02em;
  line-height: 1.3;
  white-space: nowrap;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.nav-link__key {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--lime-dim);
  transition: color 0.18s var(--ease);
}

.nav-link__label { display: inline-block; }

.nav-link:hover {
  color: var(--paper);
  background: var(--ink-2);
  border-color: var(--line);
}

.nav-link:hover .nav-link__key { color: var(--lime); }

.nav-link[aria-current="page"] { color: var(--paper); }

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

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

.header-actions {
  grid-area: actions;
  display: flex;
  align-items: center;
  gap: 12px;
}

.switch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.switch:hover {
  border-color: var(--lime-dim);
  color: var(--paper);
}

.switch__track {
  position: relative;
  display: block;
  width: 30px;
  height: 16px;
  flex: none;
  background: var(--ink-2);
  border: 1px solid var(--line);
}

.switch__thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 10px;
  height: 10px;
  background: var(--muted);
  transition: transform 0.18s var(--ease), background-color 0.18s var(--ease);
}

.switch__text { line-height: 1; white-space: nowrap; }

.switch[aria-pressed="true"] {
  border-color: var(--lime);
  color: var(--paper);
}

.switch[aria-pressed="true"] .switch__thumb {
  transform: translateX(14px);
  background: var(--lime);
}

.header-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--lime), var(--lime-dim));
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

.site-header[data-condensed] .header-inner {
  padding-top: 6px;
  padding-bottom: 6px;
}

.site-header[data-condensed] .brand__mark {
  width: 34px;
  height: 34px;
  font-size: 11px;
}

.site-header[data-condensed] .brand__note { display: none; }

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--paper);
  font-family: var(--font-narrow);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.btn--lime {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--on-lime);
  font-weight: 700;
}

.btn--lime:hover {
  background: var(--lime-dim);
  border-color: var(--lime-dim);
}

.btn--lime:focus-visible { outline-color: var(--snow); }

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

.btn--orange {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--on-lime);
  font-weight: 700;
}

.btn--orange:hover { background: #E5762B; border-color: #E5762B; }

/* ---------- layout primitives ---------- */

.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: 56px; }
.section--tight { padding-block: 32px; }

.page-head {
  padding-block: 40px 28px;
  border-bottom: 1px solid var(--line);
}

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

.rail-layout {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 7fr) minmax(0, 2fr);
  gap: var(--gutter);
  align-items: start;
}

.arc-rule {
  height: 1px;
  border: 0;
  background: var(--line);
  transform: skewY(calc(var(--tilt) * -0.25));
  transform-origin: 0 50%;
}

/* ---------- breadcrumb ---------- */

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

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

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

.breadcrumb a {
  color: var(--muted);
  text-decoration: none;
}

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

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

/* ---------- prose ---------- */

.prose {
  max-width: 70ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--paper);
}

.prose p { margin-bottom: 1.1em; }
.prose p:last-child { margin-bottom: 0; }

.prose h2 {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 700;
  line-height: 1.35;
  margin: 1.6em 0 0.6em;
  color: var(--snow);
}

.prose h3 {
  font-family: var(--font-narrow);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin: 1.4em 0 0.5em;
  color: var(--paper);
}

.prose ul,
.prose ol {
  margin: 0 0 1.1em;
  padding-left: 1.3em;
}

.prose ul { list-style: square; }
.prose ol { list-style: decimal; }
.prose li { margin-bottom: 0.35em; }
.prose li::marker { color: var(--lime-dim); }

.prose a {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose strong { color: var(--snow); font-weight: 600; }

.prose blockquote {
  border-left: 2px solid var(--orange);
  padding-left: 16px;
  color: var(--muted);
  margin: 0 0 1.1em;
}

/* ---------- panels / tags ---------- */

.panel {
  position: relative;
  background: var(--ink-2);
  border: 1px solid var(--line);
  padding: 22px;
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.panel--lime { border-color: var(--lime-dim); }

.panel__no {
  position: absolute;
  top: 10px;
  right: 24px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--lime);
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--lime);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  flex: none;
  background: var(--lime);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  background: var(--ink);
  border: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  line-height: 1.5;
}

.tag--lime {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--on-lime);
  font-weight: 700;
}

.tag--orange {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--on-lime);
  font-weight: 700;
}

/* ---------- media containers ---------- */

.media {
  position: relative;
  overflow: hidden;
  background: var(--ink-2);
  border: 1px solid var(--line);
  aspect-ratio: 16 / 9;
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

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

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(6, 18, 15, 0) 45%, rgba(6, 18, 15, 0.78) 100%);
}

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

.media[data-empty] {
  background-image:
    repeating-linear-gradient(135deg, rgba(30, 58, 50, 0.55) 0 2px, rgba(12, 32, 27, 0) 2px 16px),
    linear-gradient(180deg, var(--ink-2), var(--ink));
}

.media[data-empty]::before {
  content: attr(data-empty);
  position: absolute;
  top: 12px;
  left: 14px;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--lime-dim);
}

.media__cap {
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 12px;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--paper);
}

/* ---------- footer ---------- */

.site-footer {
  position: relative;
  margin-top: 64px;
  background: var(--ink-3);
  border-top: 1px solid var(--line);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background:
    linear-gradient(90deg,
      var(--lime) 0,
      var(--lime) 22%,
      var(--orange) 22%,
      var(--orange) 26%,
      var(--line) 26%,
      var(--line) 100%);
}

.footer-frame {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 44px var(--gutter) 28px;
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.footer-tagline {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.95fr) minmax(0, 1.35fr);
  gap: 34px var(--gutter);
  padding-block: 30px;
}

.footer-block { min-width: 0; }

.footer-title {
  font-family: var(--font-narrow);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  line-height: 1.4;
  color: var(--lime);
  margin-bottom: 14px;
}

.key-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 14px;
}

.key-chip {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 5px 0;
  color: var(--muted);
  text-decoration: none;
  font-family: var(--font-narrow);
  font-size: 13px;
  letter-spacing: 0.02em;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.key-chip:hover {
  color: var(--paper);
  border-bottom-color: var(--line);
}

.key-chip__no {
  flex: none;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--lime-dim);
  transition: color 0.18s var(--ease);
}

.key-chip:hover .key-chip__no { color: var(--lime); }

.key-chip__label { min-width: 0; }

.footer-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--paper);
}

.footer-meta__no {
  display: inline-block;
  padding: 2px 7px;
  background: var(--lime);
  color: var(--on-lime);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.footer-note {
  max-width: 34ch;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

.contact-list {
  display: grid;
  gap: 10px;
}

.contact-list li {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
}

.contact-list__key {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.contact-value {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  font-size: 12.5px;
}

.legal-links a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.legal-links a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.icp {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- responsive ---------- */

@media (max-width: 1279px) {
  .switch { display: none; }
}

@media (max-width: 1119px) {
  .header-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "brand toggle"
      "nav nav"
      "actions actions";
    row-gap: 0;
  }

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

  .primary-nav {
    display: none;
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px solid var(--line);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-link {
    padding: 13px 10px;
    font-size: 15px;
    border-bottom: 1px solid rgba(30, 58, 50, 0.7);
  }

  .nav-link[aria-current="page"] {
    box-shadow: inset 3px 0 0 var(--lime);
  }

  .nav-link[aria-current="page"]::after { display: none; }

  .header-actions {
    display: none;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid var(--line);
  }

  .header-actions .switch { display: inline-flex; }

  .site-header[data-open] .primary-nav { display: block; }
  .site-header[data-open] .header-actions { display: flex; }

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

@media (max-width: 1023px) {
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-block--keys { grid-column: 1 / -1; }
}

@media (max-width: 767px) {
  body { font-size: 16px; }

  :root { --gutter: 18px; }

  .brand__name { font-size: 17px; }

  .section { padding-block: 40px; }

  .page-head { padding-block: 28px 20px; }

  .prose h2 { font-size: 24px; }

  .footer-frame { padding-top: 32px; }

  .footer-brand { font-size: 21px; }
}

@media (max-width: 639px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-block--keys { grid-column: auto; }
  .key-grid { gap: 2px 10px; }
  .contact-list li { grid-template-columns: 58px minmax(0, 1fr); }
  .footer-legal { flex-direction: column; align-items: flex-start; gap: 10px; }
  .header-actions .btn { width: 100%; }
}

@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;
  }
}