/* =========================================================
   UED体育官网 · /assets/site.css
   堆叠面板 + 胶囊命令栏：复古出版纸面 × 电子脉冲
   ========================================================= */

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, p, ul, ol, dl, dd, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { max-width: 100%; display: block; }
button, input { font: inherit; color: inherit; }
button { background: none; border: 0; }
a { color: inherit; }
[hidden] { display: none; }
[id] { scroll-margin-top: 108px; }

/* ---------- tokens ---------- */
:root {
  --paper: #F6F1E6;
  --panel: #FFFFFF;
  --ink: #14100D;
  --blue: #0066FF;
  --blue-deep: #0047B3;
  --blue-mist: #DCE9FF;
  --orange: #FF6B00;
  --orange-sand: #FFE3D1;
  --violet: #7B2FF2;
  --ink-blue: #0B1030;
  --muted: #6B6257;

  --radius-s: 10px;
  --radius-m: 16px;
  --radius-l: 22px;
  --wrap: 1180px;

  --dur: .22s;
  --ease: cubic-bezier(.2, .8, .2, 1);
  --shadow-panel: 0 1px 0 rgba(20,16,13,.05), 0 22px 46px -30px rgba(11,16,48,.45);
  --shadow-lift: 0 -8px 0 -6px rgba(0,102,255,.16), 0 26px 54px -32px rgba(11,16,48,.5);

  --sans: "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;
}

/* ---------- base ---------- */
body {
  background-color: var(--paper);
  background-image:
    radial-gradient(circle at 10% 6%, rgba(0,102,255,.07), transparent 44%),
    radial-gradient(circle at 92% 2%, rgba(123,47,242,.07), transparent 40%),
    radial-gradient(circle at 60% 96%, rgba(255,107,0,.06), transparent 46%);
  background-attachment: fixed;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -.02em;
  margin-bottom: .6em;
}
h1 { font-size: clamp(30px, 5vw, 52px); }
h2 { font-size: clamp(24px, 3.4vw, 36px); }
h3 { font-size: clamp(19px, 2.2vw, 25px); }
h4 { font-size: clamp(17px, 1.6vw, 19px); }

p { margin-bottom: 1.1em; }
strong { font-weight: 900; }
::selection { background: var(--blue); color: #fff; }

:focus-visible {
  outline: 3px solid var(--violet);
  outline-offset: 3px;
  border-radius: 6px;
}

.mono, .index-num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

/* ---------- layout ---------- */
.wrap { width: min(100% - 32px, var(--wrap)); margin-inline: auto; }
.wrap--narrow { width: min(100% - 32px, 820px); }

.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--7-3 { grid-template-columns: minmax(0, 7fr) minmax(0, 3fr); }

.prose { max-width: 42em; font-size: 17px; line-height: 1.75; }
.prose h2 { margin-top: 1.5em; }
.prose ul { list-style: disc; padding-left: 1.3em; margin-bottom: 1.1em; }
.prose li { margin-bottom: .35em; }

/* ---------- panels ---------- */
.panel {
  position: relative;
  background: var(--panel);
  border: 1px solid rgba(20,16,13,.07);
  border-radius: var(--radius-l);
  padding: clamp(20px, 3vw, 36px);
  box-shadow: var(--shadow-panel);
}
.panel--tint { background: var(--blue-mist); border-color: rgba(0,71,179,.14); }
.panel--sand { background: var(--orange-sand); border-color: rgba(138,54,0,.14); }
.panel--ink { background: var(--ink-blue); color: #E6ECFF; border-color: transparent; }
.panel--ink h1, .panel--ink h2, .panel--ink h3 { color: #fff; }
.panel--glass {
  background: rgba(255,255,255,.72);
  backdrop-filter: blur(14px) saturate(1.15);
  -webkit-backdrop-filter: blur(14px) saturate(1.15);
}

.panel-stack { display: grid; gap: clamp(16px, 2.6vw, 30px); margin-bottom: clamp(24px, 4vw, 48px); }
.panel-stack > .panel:nth-child(2) { box-shadow: var(--shadow-lift); }

/* ---------- small parts ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--blue-deep);
  margin-bottom: 12px;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 3px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--blue), var(--violet));
}
.index-num { font-size: 12px; letter-spacing: .16em; color: var(--muted); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .1em;
  background: var(--blue-mist);
  color: var(--blue-deep);
}
.tag--orange { background: var(--orange-sand); color: #8A3600; }
.tag--violet { background: rgba(123,47,242,.12); color: var(--violet); }

.slash {
  height: 3px;
  margin: clamp(22px, 3.4vw, 38px) 0;
  background: linear-gradient(100deg, var(--blue), var(--violet) 48%, var(--orange));
  clip-path: polygon(0 0, 100% 0, 100% 62%, 0 100%);
  opacity: .9;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5em;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease),
              color var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.btn--primary { background: var(--blue); color: #fff; }
.btn--primary:hover { background: var(--blue-deep); transform: translateY(-2px); box-shadow: 0 14px 26px -16px rgba(0,71,179,.9); }
.btn--orange { background: var(--orange); color: var(--ink); }
.btn--orange:hover { background: #FF8226; transform: translateY(-2px); }
.btn--ghost { background: transparent; border-color: rgba(20,16,13,.22); color: var(--ink); }
.btn--ghost:hover { border-color: var(--blue); background: var(--blue-mist); color: var(--blue-deep); }
.btn--sm { padding: 8px 16px; font-size: 14px; }

/* ---------- breadcrumb ---------- */
.breadcrumb {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
  margin-bottom: 18px;
}
.breadcrumb__list { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb__item + .breadcrumb__item::before { content: "/"; color: rgba(107,98,87,.6); }
.breadcrumb__item a { color: var(--blue-deep); text-decoration: none; border-bottom: 1px solid rgba(0,71,179,.3); }
.breadcrumb__item a:hover { border-bottom-color: var(--orange); color: var(--orange); }

/* ---------- media (page stage image placeholders) ---------- */
.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-m);
  background: linear-gradient(135deg, var(--blue-mist), #F1F4FF 60%, var(--orange-sand));
}
.media::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 4px;
  background: linear-gradient(90deg, var(--blue), var(--violet), var(--orange));
  opacity: .8;
}
.media img { width: 100%; height: 100%; object-fit: cover; }
.media--wide { aspect-ratio: 16 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }
.media__cap { margin-top: 8px; font-family: var(--mono); font-size: 12px; color: var(--muted); }

/* ---------- collapse group ---------- */
.acc {
  background: var(--panel);
  border: 1px solid rgba(20,16,13,.1);
  border-radius: var(--radius-m);
  overflow: hidden;
}
.acc + .acc { margin-top: 10px; }
.acc__q {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 15px 18px;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}
.acc__q::-webkit-details-marker { display: none; }
.acc__q::after { content: "+"; font-family: var(--mono); font-size: 18px; color: var(--blue); }
.acc[open] .acc__q::after { content: "–"; }
.acc[open] .acc__q { border-bottom: 1px solid rgba(20,16,13,.08); }
.acc__a { padding: 14px 18px 18px; color: var(--muted); }

/* ---------- reveal ---------- */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}
.has-js [data-reveal].is-visible { opacity: 1; transform: none; }

/* =========================================================
   header — 悬浮胶囊命令栏
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  padding: 12px 16px 0;
}

.stream {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 90;
  pointer-events: none;
  background: rgba(20,16,13,.08);
}
.stream__flow,
.footer__stream {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--blue), var(--violet), var(--orange), var(--blue));
  background-size: 300% 100%;
  animation: flowline 8s linear infinite;
}
.stream__flow { opacity: .34; }
.stream__fill {
  position: absolute;
  inset: 0;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--blue), var(--violet));
  transition: transform .12s linear;
}
@keyframes flowline { to { background-position: -300% 0; } }

.skip-link {
  position: absolute;
  left: 24px;
  top: -64px;
  z-index: 120;
  padding: 10px 18px;
  border-radius: 0 0 12px 12px;
  background: var(--blue);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 0; }

.cmdbar {
  position: relative;
  width: min(100%, var(--wrap));
  margin-inline: auto;
  border: 1px solid rgba(20,16,13,.12);
  border-radius: 999px;
  background: rgba(255,255,255,.82);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  box-shadow: 0 12px 34px -26px rgba(11,16,48,.7);
  transition: box-shadow var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.site-header.is-stuck .cmdbar {
  background: rgba(255,255,255,.94);
  box-shadow: 0 18px 42px -26px rgba(11,16,48,.62);
}

.cmdbar__inner {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 8px 10px 8px 16px;
  min-height: 58px;
}

/* brand */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex: 0 0 auto;
}
.brand__mark {
  display: inline-grid;
  place-items: center;
  min-width: 46px;
  height: 34px;
  padding: 0 8px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--blue), var(--violet));
  color: #fff;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  transform: skewX(-8deg);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.25; }
.brand__name { font-size: 17px; font-weight: 900; letter-spacing: -.01em; }
.brand__tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .16em;
  color: var(--muted);
}
.brand--footer .brand__mark { background: linear-gradient(135deg, var(--orange), var(--violet)); }
.brand--footer .brand__name { color: #fff; }
.brand--footer .brand__tag { color: rgba(220,233,255,.66); }

/* nav */
.nav { flex: 1; display: flex; justify-content: center; min-width: 0; }
.nav__list { display: flex; align-items: center; gap: 2px; }
.nav__link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 13px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.nav__num { font-family: var(--mono); font-size: 10px; letter-spacing: .14em; color: var(--muted); }
.nav__link:hover { background: var(--blue-mist); color: var(--blue-deep); }
.nav__link[aria-current="page"] { background: var(--blue); color: #fff; }
.nav__link[aria-current="page"] .nav__num { color: rgba(255,255,255,.72); }

/* tools */
.cmdbar__tools { display: flex; align-items: center; gap: 8px; margin-left: auto; flex: 0 0 auto; }
.cmd-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid rgba(20,16,13,.16);
  border-radius: 999px;
  background: rgba(255,255,255,.72);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease),
              color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.cmd-btn:hover { border-color: var(--blue); background: var(--blue-mist); color: var(--blue-deep); }
.cmd-btn__key {
  display: grid;
  place-items: center;
  width: 20px;
  height: 20px;
  border-radius: 6px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 11px;
}
.cmd-btn--accent { background: var(--orange); border-color: transparent; color: var(--ink); }
.cmd-btn--accent:hover { background: #FF8226; color: var(--ink); transform: translateY(-2px); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid rgba(20,16,13,.16);
  border-radius: 999px;
  background: rgba(255,255,255,.72);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
}
.nav-toggle__bars { display: grid; gap: 3px; width: 16px; }
.nav-toggle__bars i {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--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); }

/* palette */
.palette {
  position: absolute;
  left: 0;
  right: 0;
  top: calc(100% + 10px);
  z-index: 70;
  padding: 16px;
  border: 1px solid rgba(20,16,13,.12);
  border-radius: 20px;
  background: var(--panel);
  box-shadow: 0 34px 66px -34px rgba(11,16,48,.6);
}
.palette[hidden] { display: none; }
.palette__label {
  display: block;
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--muted);
}
.palette__input {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid rgba(20,16,13,.16);
  border-radius: 12px;
  background: var(--paper);
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: .04em;
}
.palette__input:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px rgba(0,102,255,.2); }
.palette__list { display: grid; gap: 2px; margin-top: 10px; max-height: 46vh; overflow-y: auto; }
.palette__item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  font-weight: 700;
  text-decoration: none;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.palette__item:hover { background: var(--blue-mist); color: var(--blue-deep); }
.palette__num { font-family: var(--mono); font-size: 11px; letter-spacing: .12em; color: var(--blue-deep); }
.palette__empty { margin: 12px 4px 0; font-size: 14px; color: var(--muted); }

/* =========================================================
   footer — 深墨蓝整幅收口
   ========================================================= */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 96px);
  padding: 0 0 26px;
  background: var(--ink-blue);
  color: #CFDBFF;
  overflow: hidden;
}
.footer__stream { z-index: 1; height: 3px; }
.footer__inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
  gap: clamp(20px, 3vw, 40px);
  padding: clamp(36px, 5vw, 64px) 0 30px;
}
.footer__brand { display: flex; flex-direction: column; gap: 14px; }
.footer__desc { font-size: 14px; line-height: 1.7; color: rgba(220,233,255,.66); max-width: 30em; }

.footer__title {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 14px;
}
.footer__list { display: grid; gap: 9px; font-size: 14px; }
.footer__list a {
  color: #CFDBFF;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.footer__list a:hover { color: #fff; border-bottom-color: var(--orange); }
.footer__list--mono {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .02em;
  color: rgba(220,233,255,.78);
}

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-top: 18px;
  border-top: 1px solid rgba(220,233,255,.16);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(220,233,255,.7);
}
.footer__icp { color: var(--orange-sand); }
.footer__hours { color: rgba(220,233,255,.55); }

/* =========================================================
   responsive
   ========================================================= */
@media (max-width: 1000px) {
  .nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    display: none;
    flex: none;
    z-index: 66;
    padding: 10px;
    border: 1px solid rgba(20,16,13,.12);
    border-radius: 18px;
    background: var(--panel);
    box-shadow: 0 34px 66px -34px rgba(11,16,48,.6);
  }
  .nav[data-open] { display: block; animation: navIn .22s var(--ease); }
  .nav__list { flex-direction: column; align-items: stretch; gap: 2px; }
  .nav__link { padding: 12px 14px; border-radius: 12px; font-size: 16px; }
  .nav-toggle { display: inline-flex; }

  .footer__inner { grid-template-columns: 1fr 1fr; }
  .grid--3, .grid--2, .grid--7-3 { grid-template-columns: minmax(0, 1fr); }
}
@keyframes navIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 760px) {
  .cmdbar__inner { gap: 8px; padding: 8px 8px 8px 12px; min-height: 54px; }
  .nav__num { display: none; }
  .cmd-btn__label { display: none; }
  .cmd-btn { padding: 9px 11px; }
  .footer__bottom { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 560px) {
  .brand__tag { display: none; }
  .cmd-btn--accent { display: none; }
  .footer__inner { grid-template-columns: 1fr; }
  .skip-link { left: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  html { scroll-behavior: auto; }
  .has-js [data-reveal] { opacity: 1; transform: none; }
  .stream__fill { transition: none; }
}