/* ==========================================================================
   亿电竞 · 数据台 — 共享外壳样式 /assets/site.css
   深空屏幕墙 · 印刷说明牌 · 等宽索引
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

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

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

a { color: inherit; text-decoration: none; }

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

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

h1, h2, h3, h4 { text-wrap: balance; }

/* ---------- tokens ---------- */
:root {
  --void: #060A12;
  --panel: #0D1624;
  --steel: #18263A;
  --mist: #8FA4C2;
  --paper: #F2F7FF;
  --cyan: #31F2DF;
  --magenta: #FF3D9E;
  --amber: #F4B84C;
  --mint: #9AD9C8;
  --print: #02040A;

  --line: rgba(143, 164, 194, 0.2);
  --line-strong: rgba(143, 164, 194, 0.42);
  --line-cyan: rgba(49, 242, 223, 0.38);
  --line-amber: rgba(244, 184, 76, 0.42);
  --line-magenta: rgba(255, 61, 158, 0.4);

  --font-display: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC",
    "Microsoft YaHei", "Heiti SC", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "JetBrains Mono",
    "IBM Plex Mono", Menlo, Consolas, monospace;

  --wrap: 1240px;
  --gutter: clamp(16px, 4vw, 40px);
  --header-h: 62px;

  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --dur: 220ms;
  --radius: 2px;
}

@media (min-width: 1024px) {
  :root { --header-h: 76px; }
}

/* ---------- base ---------- */
body {
  background-color: var(--void);
  background-image:
    linear-gradient(180deg, rgba(13, 22, 36, 0.85) 0%, rgba(6, 10, 18, 0) 420px),
    repeating-linear-gradient(0deg, rgba(143, 164, 194, 0.045) 0 1px, transparent 1px 4px);
  background-attachment: scroll;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.65;
  padding-top: var(--header-h);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.012em;
}

p { max-width: 68ch; }

::selection {
  background: var(--cyan);
  color: var(--void);
}

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

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

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

.visually-hidden {
  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;
}

.rule-line {
  height: 1px;
  border: 0;
  background: var(--line);
}

.divider-skew {
  height: clamp(28px, 5vw, 56px);
  background: linear-gradient(100deg, rgba(24, 38, 58, 0.9), transparent 72%);
  clip-path: polygon(0 0, 100% 26%, 100% 100%, 0 74%);
  border: 0;
  pointer-events: none;
}

.section-head {
  display: flex;
  align-items: flex-end;
  gap: clamp(12px, 2vw, 22px);
  flex-wrap: wrap;
  margin-bottom: clamp(18px, 3vw, 32px);
}

.section-index {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(42px, 7vw, 78px);
  line-height: 0.8;
  letter-spacing: -0.03em;
  color: rgba(143, 164, 194, 0.24);
}

.grid-bento {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(12px, 1.6vw, 20px);
}

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 300;
  transform: translateY(-240%);
  padding: 10px 18px;
  background: var(--cyan);
  color: var(--void);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  transition: transform 180ms var(--ease);
}

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

/* ---------- header ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 90;
  background: linear-gradient(
    180deg,
    rgba(6, 10, 18, 0.94) 0%,
    rgba(6, 10, 18, 0.58) 62%,
    rgba(6, 10, 18, 0) 100%
  );
  border-bottom: 1px solid transparent;
  color: var(--paper);
  transition:
    background var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.site-header[data-stuck] {
  background: rgba(13, 22, 36, 0.97);
  border-bottom-color: var(--line-cyan);
  box-shadow:
    0 1px 0 rgba(49, 242, 223, 0.14),
    0 22px 46px -34px rgba(2, 4, 10, 0.95);
}

.header-inner {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 22px);
}

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--cyan), var(--magenta));
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  .scroll-progress { transition: none; }
}

/* brand */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  padding: 4px 0;
}

.brand-mark {
  width: 11px;
  height: 26px;
  background: var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% 64%, 0 100%);
  box-shadow: 0 0 14px rgba(49, 242, 223, 0.55);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: 0.05em;
}

.brand-sub {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--mist);
}

.brand--footer .brand-name { font-size: 20px; }
.brand--footer .brand-mark { height: 30px; }

/* season chip */
.season-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  flex: 0 0 auto;
  padding: 4px 10px;
  border: 1px solid var(--line-amber);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber);
  white-space: nowrap;
}

.season-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 9px var(--amber);
  animation: seasonPulse 3.4s ease-in-out infinite;
}

@keyframes seasonPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.32; }
}

/* nav */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.4vw, 20px);
  margin-inline-start: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(2px, 0.8vw, 12px);
}

.nav-item { display: flex; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 9px 9px 11px;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: rgba(242, 247, 255, 0.76);
  white-space: nowrap;
  transition: color var(--dur) var(--ease);
}

.nav-link::before {
  content: attr(data-idx);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  color: rgba(143, 164, 194, 0.55);
  transform: translateY(-0.35em);
  transition: color var(--dur) var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 9px;
  right: 9px;
  bottom: 5px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--paper);
}

.nav-link:hover::after,
.nav-link:focus-visible::after {
  transform: scaleX(1);
}

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

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

.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--magenta);
}

.nav-quick {
  display: flex;
  align-items: center;
  gap: 6px;
  padding-inline-start: clamp(8px, 1.2vw, 16px);
  border-inline-start: 1px solid var(--line);
}

.quick-link {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  padding: 6px 10px;
  border: 1px solid var(--line-strong);
  color: var(--mist);
  white-space: nowrap;
  transition:
    color var(--dur) var(--ease),
    background var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.quick-link:hover,
.quick-link:focus-visible {
  color: var(--void);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* nav toggle */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-inline-start: auto;
  padding: 9px 12px;
  border: 1px solid var(--line-strong);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  min-height: 44px;
}

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

.nav-toggle-mark {
  position: relative;
  display: block;
  width: 16px;
  height: 12px;
}

.nav-toggle-mark i {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--cyan);
  transition: transform var(--dur) var(--ease);
}

.nav-toggle-mark i:nth-child(1) { top: 0; }
.nav-toggle-mark i:nth-child(2) { bottom: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle-mark i:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-mark i:nth-child(2) {
  transform: translateY(-5px) rotate(-45deg);
}

/* ---------- footer ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 9vw, 128px);
  background: linear-gradient(180deg, var(--void) 0%, var(--panel) 38%);
  border-top: 1px solid var(--line);
  color: var(--paper);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 5px;
  background: repeating-linear-gradient(
    90deg,
    rgba(49, 242, 223, 0.55) 0 22px,
    transparent 22px 46px
  );
  opacity: 0.7;
  pointer-events: none;
}

.footer-inner {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(38px, 5.5vw, 68px) var(--gutter) clamp(26px, 4vw, 46px);
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.85fr) minmax(0, 1.1fr);
  gap: clamp(26px, 4vw, 56px);
}

.footer-summary {
  margin-top: 16px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
  max-width: 40ch;
}

.footer-note {
  margin-top: 14px;
  padding-left: 12px;
  border-left: 2px solid var(--steel);
  font-size: 12px;
  line-height: 1.65;
  color: rgba(143, 164, 194, 0.78);
  max-width: 44ch;
}

.footer-nav-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
  margin-bottom: 14px;
}

.footer-nav-list li + li { margin-top: 2px; }

.footer-nav-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  min-height: 32px;
  font-size: 14px;
  color: rgba(242, 247, 255, 0.82);
  transition: color var(--dur) var(--ease);
}

.footer-nav-list a::before {
  content: "";
  width: 6px;
  height: 1px;
  background: var(--line-strong);
  transition: width var(--dur) var(--ease), background var(--dur) var(--ease);
}

.footer-nav-list a:hover,
.footer-nav-list a:focus-visible {
  color: var(--cyan);
}

.footer-nav-list a:hover::before,
.footer-nav-list a:focus-visible::before {
  width: 14px;
  background: var(--cyan);
}

.footer-contact-list li {
  padding: 9px 0;
  border-bottom: 1px dashed var(--line);
}

.footer-field {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
  margin-bottom: 3px;
}

.footer-value {
  display: block;
  font-size: 14px;
  line-height: 1.5;
  color: rgba(242, 247, 255, 0.9);
  overflow-wrap: anywhere;
}

.footer-contact .btn {
  margin-top: 18px;
}

.footer-base {
  border-top: 1px solid var(--line);
  background: rgba(2, 4, 10, 0.62);
}

.footer-base-inner {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 16px var(--gutter) 22px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 28px;
  font-size: 12px;
  color: var(--mist);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  max-width: none;
}

.footer-legal a {
  padding: 4px 0;
  transition: color var(--dur) var(--ease);
}

.footer-legal a:hover,
.footer-legal a:focus-visible { color: var(--cyan); }

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 18px;
  max-width: none;
  font-size: 12px;
}

.footer-icp {
  padding: 2px 8px;
  border: 1px solid var(--line);
  color: rgba(143, 164, 194, 0.9);
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-align: center;
  transition:
    color var(--dur) var(--ease),
    background var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

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

.btn--primary {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--void);
  font-weight: 700;
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--paper);
  border-color: var(--paper);
}

.btn--ghost {
  color: var(--mist);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  color: var(--void);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- tags ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--line-strong);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  line-height: 1.6;
}

.tag--cyan {
  color: var(--cyan);
  border-color: var(--line-cyan);
}

.tag--magenta {
  color: var(--magenta);
  border-color: var(--line-magenta);
}

.tag--amber {
  color: var(--amber);
  border-color: var(--line-amber);
}

/* ---------- plaque (说明牌卡片) ---------- */
.plaque {
  position: relative;
  padding: clamp(16px, 2.2vw, 26px);
  background: var(--panel);
  border: 1px solid var(--line);
}

.plaque::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: var(--steel);
  transition: background var(--dur) var(--ease);
}

.plaque:hover::before { background: var(--cyan); }

.plaque--stack {
  box-shadow:
    8px 8px 0 -1px rgba(24, 38, 58, 0.85),
    8px 8px 0 0 var(--line);
}

/* ---------- media frame ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--steel);
  aspect-ratio: 16 / 10;
}

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

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    rgba(6, 10, 18, 0.26) 0 1px,
    transparent 1px 4px
  );
  opacity: 0.55;
  pointer-events: none;
}

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

.media-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- breadcrumb ---------- */
.breadcrumb {
  padding-block: 16px;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

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

.breadcrumb-list li + li::before {
  content: "/";
  color: rgba(143, 164, 194, 0.4);
}

.breadcrumb-list a { transition: color var(--dur) var(--ease); }

.breadcrumb-list a:hover,
.breadcrumb-list a:focus-visible { color: var(--cyan); }

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

/* ---------- reveal ---------- */
html.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 520ms var(--ease), transform 520ms var(--ease);
}

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

/* ---------- responsive ---------- */
@media (max-width: 1023px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    z-index: 80;
    display: block;
    margin: 0;
    padding: 18px var(--gutter) 26px;
    background: rgba(9, 15, 25, 0.985);
    border-bottom: 1px solid var(--line-cyan);
    box-shadow: 0 34px 60px -32px rgba(2, 4, 10, 0.98);
    max-height: calc(100vh - var(--header-h));
    max-height: calc(100dvh - var(--header-h));
    overflow-y: auto;
    overscroll-behavior: contain;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transition:
      opacity var(--dur) var(--ease),
      transform var(--dur) var(--ease),
      visibility var(--dur) var(--ease);
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }

  .nav-list {
    display: block;
  }

  .nav-item { display: block; }

  .nav-link {
    display: flex;
    width: 100%;
    padding: 14px 2px;
    font-size: 16px;
    border-bottom: 1px solid var(--line);
    align-items: baseline;
  }

  .nav-link::before {
    font-size: 11px;
    width: 26px;
    flex: 0 0 26px;
    transform: none;
  }

  .nav-link::after { display: none; }

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

  .nav-quick {
    margin-top: 16px;
    padding: 14px 0 0;
    border-inline-start: 0;
    border-top: 1px solid var(--line);
    flex-wrap: wrap;
    gap: 8px;
  }

  .quick-link { padding: 8px 14px; }

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

  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .header-inner { gap: 8px; }

  .season-chip {
    font-size: 10px;
    padding: 3px 7px;
    letter-spacing: 0.1em;
  }

  .brand-name { font-size: 16px; }

  .nav-toggle-text { display: none; }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .footer-base-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 380px) {
  .season-chip { display: none; }
}

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

  .season-dot { animation: none; }

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

  .nav-link::after,
  .btn,
  .quick-link,
  .nav-toggle-mark i {
    transition: none;
  }

  .btn:hover,
  .btn:focus-visible { transform: none; }

  .site-nav { transition: none; }
}