/* ============================================================
   UED赛场 · shared site kit  /assets/site.css
   ============================================================ */

:root {
  --ink-900: #081C17;
  --ink-800: #0F2F27;
  --ink-700: #1B4D3E;
  --paper-100: #F3EFE6;
  --paper-200: #E4DDD0;
  --paper-400: #B9B3A6;
  --gray-500: #6C746E;
  --cyan-400: #2EE6C5;
  --cyan-200: #8FFFE6;
  --amber-400: #E8A83E;
  --amber-100: #F7E6C4;
  --alert: #C96A5A;
  --white: #FCFBF7;

  --rail-w: 248px;
  --bar-h: 60px;
  --content-max: 1180px;

  --font-display: "Barlow Condensed", "Archivo Narrow", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", "SFMono-Regular", Consolas, "Courier New", monospace;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --line-dark: rgba(46, 230, 197, 0.18);
  --line-soft: rgba(46, 230, 197, 0.32);
}

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

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

html.nav-open { overflow: hidden; }

body {
  margin: 0;
  min-height: 100vh;
  padding-block-start: var(--bar-h);
  background: var(--paper-100);
  color: var(--ink-900);
  font-family: var(--font-body);
  font-size: clamp(16px, 0.6vw + 14.6px, 18px);
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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, picture { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
input, textarea, select { font: inherit; color: inherit; }

:focus-visible {
  outline: 2px solid var(--ink-700);
  outline-offset: 3px;
}
.site-frame :focus-visible,
.site-foot :focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
}

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

/* ============================================================
   HEADER FRAME
   ============================================================ */
.site-frame {
  position: fixed;
  inset: 0;
  z-index: 120;
  pointer-events: none;
}

.skip-link {
  position: fixed;
  inset-block-start: 10px;
  inset-inline-start: 10px;
  z-index: 200;
  padding: 12px 18px;
  background: var(--cyan-400);
  color: var(--ink-900);
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.08em;
  transform: translateY(-180%);
  transition: transform 0.25s var(--ease);
  pointer-events: auto;
}
.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline-offset: 2px;
}

/* ---------- rail ---------- */
.frame-rail {
  position: absolute;
  inset-block: var(--bar-h) 0;
  inset-inline-start: 0;
  z-index: 3;
  display: flex;
  flex-direction: column;
  width: var(--rail-w);
  padding: 18px 20px 24px;
  background: var(--ink-900);
  color: var(--paper-100);
  border-inline-end: 1px solid var(--line-dark);
  transform: translateX(-104%);
  transition: transform 0.38s var(--ease);
  pointer-events: auto;
  overflow-y: auto;
  overscroll-behavior: contain;
}
.site-frame[data-open] .frame-rail {
  transform: translateX(0);
  box-shadow: 28px 0 70px rgba(4, 14, 12, 0.5);
}

.frame-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 4px 0 22px;
  border-block-end: 1px solid var(--line-dark);
}
.frame-brand__mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 42px;
  height: 42px;
  background: var(--cyan-400);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
}
.frame-brand__text {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}
.frame-brand__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.1;
  color: var(--white);
}
.frame-brand__sub {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.16em;
  line-height: 1.3;
  color: rgba(243, 239, 230, 0.5);
  white-space: nowrap;
}

.frame-nav { padding-block: 20px 0; }
.frame-nav__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.frame-nav__link {
  position: relative;
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  padding: 11px 10px 11px 12px;
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.1em;
  color: rgba(243, 239, 230, 0.66);
  transition: color 0.25s var(--ease), background-color 0.25s var(--ease);
}
.frame-nav__link::before {
  content: "";
  position: absolute;
  inset-block: 6px;
  inset-inline-start: 0;
  width: 2px;
  background: var(--cyan-400);
  transform: scaleY(0);
  transform-origin: 50% 0;
  transition: transform 0.3s var(--ease);
}
.frame-nav__link:hover {
  color: var(--white);
  background: rgba(46, 230, 197, 0.07);
}
.frame-nav__link:hover::before { transform: scaleY(1); }
.frame-nav__link[aria-current="page"] {
  color: var(--cyan-200);
  background: rgba(46, 230, 197, 0.1);
}
.frame-nav__link[aria-current="page"]::before {
  transform: scaleY(1);
  background: var(--amber-400);
}
.frame-nav__link[aria-current="page"] .frame-nav__idx { color: var(--amber-400); }
.frame-nav__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(243, 239, 230, 0.34);
}
.frame-nav__label { min-width: 0; }

.rail-status {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-block-start: auto;
  padding-block-start: 18px;
  border-block-start: 1px solid var(--line-dark);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: rgba(243, 239, 230, 0.55);
}
.rail-status__dot {
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan-400);
  animation: railPulse 2.8s ease-out infinite;
}
@keyframes railPulse {
  0% { box-shadow: 0 0 0 0 rgba(46, 230, 197, 0.45); }
  70% { box-shadow: 0 0 0 9px rgba(46, 230, 197, 0); }
  100% { box-shadow: 0 0 0 0 rgba(46, 230, 197, 0); }
}

/* ---------- top bar ---------- */
.frame-bar {
  position: absolute;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 4;
  display: flex;
  align-items: center;
  gap: 14px;
  height: var(--bar-h);
  padding-inline: 18px;
  background: rgba(8, 28, 23, 0.95);
  border-block-end: 1px solid var(--line-dark);
  color: var(--paper-100);
  backdrop-filter: blur(8px);
  pointer-events: auto;
}

.frame-bar__meta {
  display: flex;
  align-items: center;
  gap: 9px;
  flex: 1 1 auto;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(243, 239, 230, 0.62);
  white-space: nowrap;
  overflow: hidden;
}
.frame-bar__pulse {
  flex: none;
  width: 7px;
  height: 7px;
  background: var(--amber-400);
  animation: barPulse 2.2s steps(2, end) infinite;
}
@keyframes barPulse {
  0%, 60% { opacity: 1; }
  61%, 100% { opacity: 0.22; }
}

.frame-bar__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: none;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 9px 16px;
  border: 1px solid transparent;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  line-height: 1.2;
  white-space: nowrap;
  text-align: center;
  transition: background-color 0.22s var(--ease), color 0.22s var(--ease), border-color 0.22s var(--ease);
}
.btn--primary {
  background: var(--cyan-400);
  border-color: var(--cyan-400);
  color: var(--ink-900);
}
.btn--primary:hover {
  background: var(--cyan-200);
  border-color: var(--cyan-200);
}
.btn--ghost {
  background: transparent;
  border-color: var(--line-soft);
  color: var(--paper-100);
}
.btn--ghost:hover {
  background: rgba(46, 230, 197, 0.12);
  border-color: var(--cyan-400);
  color: var(--white);
}
.btn--outline {
  background: transparent;
  border-color: var(--ink-700);
  color: var(--ink-900);
}
.btn--outline:hover {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: var(--paper-100);
}

/* ---------- toggle + scrim + progress ---------- */
.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  flex: none;
  width: 44px;
  height: 44px;
  padding: 0 10px;
  border: 1px solid var(--line-soft);
  color: var(--paper-100);
  pointer-events: auto;
}
.nav-toggle__bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--cyan-200);
  transition: transform 0.3s var(--ease), opacity 0.18s linear;
}
.site-frame[data-open] .nav-toggle__bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.site-frame[data-open] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.site-frame[data-open] .nav-toggle__bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.frame-scrim {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: rgba(4, 14, 12, 0.66);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.3s var(--ease), visibility 0.3s;
}
.site-frame[data-open] .frame-scrim {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.frame-progress {
  position: absolute;
  inset-block-start: var(--bar-h);
  inset-inline: 0;
  z-index: 5;
  height: 2px;
  background: rgba(46, 230, 197, 0.1);
  pointer-events: none;
}
.frame-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan-400), var(--amber-400));
  transform: scaleX(0);
  transform-origin: 0 50%;
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-foot {
  position: relative;
  padding: clamp(44px, 6vw, 84px) clamp(20px, 5vw, 56px) 26px;
  background: var(--ink-900);
  color: var(--paper-100);
  border-block-start: 1px solid var(--line-dark);
}
.site-foot::before {
  content: "";
  position: absolute;
  inset-block-start: 0;
  inset-inline-start: 0;
  width: 120px;
  height: 2px;
  background: var(--amber-400);
}

.foot-grid {
  display: grid;
  grid-template-columns: minmax(240px, 1.5fr) minmax(150px, 0.8fr) minmax(150px, 0.8fr) minmax(220px, 1.1fr);
  gap: clamp(24px, 4vw, 56px);
  max-width: var(--content-max);
  margin-inline: auto;
}

.foot-brand__name {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0.1em;
  line-height: 1.1;
  color: var(--white);
}
.foot-brand__sub {
  margin-block-start: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--cyan-400);
}
.foot-brand__desc {
  max-width: 34ch;
  margin-block: 14px 22px;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(243, 239, 230, 0.66);
}
.foot-brand__cta { margin-block-start: 2px; }

.foot-col__title {
  margin-block-end: 16px;
  padding-block-end: 12px;
  border-block-end: 1px solid var(--line-dark);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-400);
}
.foot-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.foot-links a {
  display: inline-block;
  font-size: 14px;
  color: rgba(243, 239, 230, 0.72);
  border-block-end: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.foot-links a:hover {
  color: var(--cyan-200);
  border-block-end-color: var(--cyan-400);
}

.foot-contact__list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.foot-contact__item { min-width: 0; }
.foot-contact__key {
  display: block;
  margin-block-end: 3px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: rgba(243, 239, 230, 0.45);
}
.foot-contact__val {
  display: block;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(243, 239, 230, 0.86);
  overflow-wrap: anywhere;
}

.foot-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  justify-content: space-between;
  max-width: var(--content-max);
  margin: clamp(34px, 5vw, 60px) auto 0;
  padding-block-start: 20px;
  border-block-start: 1px solid var(--line-dark);
}
.foot-copy,
.foot-note {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: rgba(243, 239, 230, 0.5);
}

/* ============================================================
   SHARED CONTENT PRIMITIVES
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 56px);
}

.section { padding-block: clamp(44px, 6vw, 88px); }
.section--tight { padding-block: clamp(28px, 4vw, 52px); }

.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--paper-400);
  opacity: 0.55;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-700);
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--amber-400);
}

.display-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(56px, 9vw, 160px);
  line-height: 0.92;
  letter-spacing: 0.01em;
  color: var(--ink-900);
}
.page-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(40px, 5vw, 72px);
  line-height: 1.02;
  letter-spacing: 0.02em;
  color: var(--ink-900);
}
.lead {
  max-width: 62ch;
  font-size: clamp(17px, 1.4vw, 19px);
  line-height: 1.75;
  color: var(--gray-500);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-block-end: 2px;
  border-block-end: 1px solid currentColor;
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--ink-700);
  transition: color 0.2s var(--ease), gap 0.2s var(--ease);
}
.link-arrow::after { content: "\2192"; font-family: var(--font-mono); }
.link-arrow:hover { color: var(--ink-900); gap: 12px; }

/* panels / cards / tags / stats */
.panel {
  padding: clamp(20px, 3vw, 32px);
  background: var(--paper-200);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}
.panel--dark {
  background: var(--ink-800);
  color: var(--paper-100);
}
.panel--dark .stat__num { color: var(--amber-400); }
.panel--dark .stat__label { color: rgba(243, 239, 230, 0.55); }
.panel--amber { background: var(--amber-100); }

.card {
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--white);
  border: 1px solid var(--paper-200);
  border-block-start: 2px solid var(--ink-700);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border: 1px solid rgba(232, 168, 62, 0.5);
  background: var(--amber-100);
  color: var(--ink-800);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  line-height: 1.5;
}
.tag--cyan {
  background: rgba(46, 230, 197, 0.14);
  border-color: rgba(46, 230, 197, 0.5);
  color: var(--ink-700);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.stat__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 3.6vw, 48px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--ink-900);
}
.stat__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray-500);
}

/* grids */
.split {
  display: grid;
  gap: clamp(24px, 4vw, 56px);
  grid-template-columns: minmax(0, 1fr);
}
.grid-2 {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.grid-3 {
  display: grid;
  gap: clamp(18px, 2.6vw, 32px);
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

/* breadcrumb */
.breadcrumb { padding-block: 16px; }
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gray-500);
}
.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 10px;
}
.breadcrumb li + li::before {
  content: "/";
  color: var(--paper-400);
}
.breadcrumb a {
  color: var(--gray-500);
  border-block-end: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.breadcrumb a:hover {
  color: var(--ink-900);
  border-block-end-color: var(--cyan-400);
}
.breadcrumb [aria-current="page"] { color: var(--ink-900); }

/* media container base */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  width: 100%;
  aspect-ratio: var(--media-ratio, 16 / 9);
  background: var(--ink-800);
  color: var(--paper-100);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
}
.media-frame > img,
.media-frame > picture,
.media-frame > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--wide { --media-ratio: 21 / 9; }
.media-frame--tall { --media-ratio: 4 / 5; }
.media-frame--diag {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 40px), calc(100% - 40px) 100%, 0 100%);
}

/* filter protocol */
.filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-block-end: 24px;
}
.filter__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gray-500);
}
.filter__input {
  flex: 1 1 220px;
  min-width: 0;
  padding: 11px 14px;
  background: var(--white);
  border: 1px solid var(--paper-400);
  color: var(--ink-900);
  font-family: var(--font-body);
  font-size: 15px;
}
.filter__input:focus-visible {
  outline: 2px solid var(--ink-700);
  outline-offset: 2px;
  border-color: var(--ink-700);
}
.filter__empty {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gray-500);
}

/* reveal protocol */
.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
  will-change: opacity, transform;
}
.js-reveal [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
  will-change: auto;
}

/* ============================================================
   BREAKPOINTS
   ============================================================ */
@media (min-width: 720px) {
  .split { grid-template-columns: minmax(0, 4fr) minmax(0, 7fr); }
  .frame-bar { padding-inline: 24px; }
}

@media (min-width: 1024px) {
  :root { --bar-h: 60px; }

  body {
    padding-block-start: var(--bar-h);
    padding-inline-start: var(--rail-w);
  }

  .frame-rail {
    inset-block-start: 0;
    transform: none;
    transition: none;
  }
  .site-frame[data-open] .frame-rail {
    box-shadow: none;
  }

  .frame-bar {
    inset-inline-start: var(--rail-w);
    padding-inline: 28px;
  }
  .frame-progress { inset-inline-start: var(--rail-w); }

  .nav-toggle { display: none; }
  .frame-scrim { display: none; }
}

@media (max-width: 1023.98px) {
  :root {
    --rail-w: min(84vw, 322px);
    --bar-h: 64px;
  }

  .frame-bar__actions .btn--ghost { display: none; }
  .foot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .foot-brand { grid-column: 1 / -1; }
}

@media (max-width: 639.98px) {
  .foot-grid { grid-template-columns: minmax(0, 1fr); }
  .foot-bottom { flex-direction: column; }
  .frame-bar__meta { font-size: 9.5px; letter-spacing: 0.12em; }
  .frame-bar__actions .btn { min-height: 38px; padding: 8px 13px; font-size: 12px; }
}

/* ============================================================
   REDUCED MOTION
   ============================================================ */
@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-status__dot,
  .frame-bar__pulse { animation: none; }

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

  .frame-rail { transition: none; }
}