/* ============================================================
   星空体育入口 · 共享样式 /assets/site.css
   深空观测站基调 + 奶油纸编辑部并置
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
}

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 { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }

:root {
  --ink: #070A14;
  --ink-panel: #101728;
  --ink-deep: #0B1120;
  --orbit: #1E2740;
  --paper: #F3E9D8;
  --paper-shade: #E2D4BC;
  --ink-brown: #241C14;
  --nebula: #7B5CFF;
  --cyan: #29D8E8;
  --flame: #FF6B2C;
  --vermilion: #C6432B;
  --lg-1: #FFB020;
  --lg-2: #3ED598;
  --lg-3: #F05FA6;
  --lg-4: #A8D62B;
  --lg-5: #59A9FF;
  --text: #E6EAF4;
  --text-soft: #AEB7CC;
  --text-dim: #78829C;
  --font-sans: 'PingFang SC', 'Source Han Sans SC', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;
  --shell: 1280px;
  --gutter: clamp(18px, 4vw, 40px);
  --r-xl: 28px;
  --r-lg: 20px;
  --r-md: 14px;
  --ease: cubic-bezier(.22, .7, .3, 1);
}

body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    radial-gradient(circle at 14% 10%, rgba(123, 92, 255, .17), transparent 42%),
    radial-gradient(circle at 88% 6%, rgba(41, 216, 232, .13), transparent 38%),
    radial-gradient(circle at 72% 84%, rgba(255, 107, 44, .09), transparent 46%),
    radial-gradient(1px 1px at 22% 34%, rgba(243, 233, 216, .5), transparent),
    radial-gradient(1px 1px at 68% 18%, rgba(243, 233, 216, .38), transparent),
    radial-gradient(1px 1px at 42% 72%, rgba(243, 233, 216, .32), transparent),
    radial-gradient(1px 1px at 84% 58%, rgba(41, 216, 232, .45), transparent);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.9;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: .02em;
  color: var(--text);
}

a { transition: color .25s var(--ease), border-color .25s var(--ease); }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

[data-section] { scroll-margin-top: 96px; }

/* ---------- 排版组件 ---------- */

.shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section { padding: clamp(52px, 8vw, 108px) 0; }

.section-head {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 74ch;
  margin-bottom: clamp(26px, 4vw, 50px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}

.title-xl { font-size: clamp(2.5rem, 7vw, 4.25rem); line-height: 1.03; letter-spacing: .03em; }
.title-lg { font-size: clamp(1.9rem, 4.4vw, 3rem); line-height: 1.12; }
.title-md { font-size: clamp(1.35rem, 2.4vw, 2rem); line-height: 1.28; }

.section-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 700;
  line-height: .9;
  letter-spacing: -.03em;
  color: var(--nebula);
  text-shadow: 0 0 28px rgba(123, 92, 255, .45);
}

.lede {
  max-width: 62ch;
  font-size: clamp(1.02rem, 1.5vw, 1.2rem);
  line-height: 1.95;
  color: var(--text-soft);
}

.prose { max-width: 68ch; color: var(--text-soft); }
.prose > * + * { margin-top: 1.05em; }
.prose strong { color: var(--text); }
.prose h3 { color: var(--text); }

.mono { font-family: var(--font-mono); font-variant-ligatures: none; }

.sidenote {
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.8;
  letter-spacing: .16em;
  color: var(--text-dim);
}
.sidenote--vertical { writing-mode: vertical-rl; letter-spacing: .32em; }

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5em;
  padding: .72rem 1.5rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: .94rem;
  font-weight: 700;
  letter-spacing: .02em;
  transition: background-color .28s var(--ease), color .28s var(--ease),
              border-color .28s var(--ease), transform .28s var(--ease);
}
.btn:hover { transform: translateY(-1px); }

.btn-primary { background: var(--flame); color: #1A0A02; }
.btn-primary:hover { background: #FF8348; }

.btn-ghost {
  border-color: rgba(41, 216, 232, .5);
  background: rgba(41, 216, 232, .06);
  color: var(--cyan);
}
.btn-ghost:hover { background: rgba(41, 216, 232, .16); border-color: var(--cyan); }

.btn-quiet { border-color: var(--orbit); color: var(--text-soft); }
.btn-quiet:hover { color: var(--text); border-color: rgba(123, 92, 255, .7); }

/* ---------- 跳过链接 ---------- */

.skip-link {
  position: absolute;
  left: 16px;
  top: -70px;
  z-index: 120;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--cyan);
  color: #04121A;
  font-size: .85rem;
  font-weight: 700;
  transition: top .22s var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------- 页头：框架式导航 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(7, 10, 20, .93);
  border-bottom: 1px solid var(--orbit);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}
.site-header::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--nebula) 12%, var(--cyan) 54%, var(--flame) 86%, transparent);
  opacity: .75;
}

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--nebula), var(--cyan) 58%, var(--flame));
  transition: width .1s linear;
}

.header-frame {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 14px clamp(16px, 2.4vw, 36px);
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 14px var(--gutter);
  border-left: 1px solid rgba(123, 92, 255, .38);
  border-right: 1px solid rgba(30, 39, 64, .9);
}

.brand-lockup {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.16rem;
  font-weight: 800;
  letter-spacing: .1em;
  color: var(--text);
}
.brand-mark::after {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--flame);
  box-shadow: 0 0 12px var(--flame);
}
.brand-subline {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .07em;
  color: var(--text-dim);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid rgba(123, 92, 255, .5);
  color: var(--text);
  font-size: .85rem;
  font-weight: 600;
}
.nav-toggle-label { letter-spacing: .12em; }
.nav-toggle-bars { position: relative; width: 18px; height: 12px; }
.nav-toggle-bars i {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .3s var(--ease), opacity .2s var(--ease);
}
.nav-toggle-bars i:first-child { top: 1px; }
.nav-toggle-bars i:last-child { bottom: 1px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:first-child { transform: translateY(4px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:last-child { transform: translateY(-4px) rotate(-45deg); }

.primary-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(12px, 2vw, 26px);
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.6vw, 22px);
}
.nav-item { white-space: nowrap; }

.nav-link {
  position: relative;
  display: inline-block;
  padding: 8px 2px;
  font-size: .95rem;
  font-weight: 600;
  color: var(--text-soft);
  transition: color .25s var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 3px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .3s var(--ease);
}
.nav-link:hover { color: var(--cyan); }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: var(--text); }
.nav-link[aria-current="page"]::after {
  background: var(--flame);
  box-shadow: 0 0 10px rgba(255, 107, 44, .7);
  transform: scaleX(1);
}

.header-end { display: flex; align-items: center; gap: 14px; }
.header-note {
  padding-left: 14px;
  border-left: 1px solid var(--orbit);
  font-size: 11px;
  letter-spacing: .06em;
  white-space: nowrap;
  color: var(--text-dim);
}
.btn-cta {
  padding: .55rem 1.05rem;
  font-size: .85rem;
  background: var(--flame);
  color: #1A0A02;
}
.btn-cta:hover { background: #FF8348; }

/* ---------- 页脚 ---------- */

.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 110px);
  padding: clamp(44px, 7vw, 88px) 0 30px;
  background: linear-gradient(180deg, #0A0F1D 0%, #070A14 100%);
  border-top: 1px solid var(--orbit);
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(123, 92, 255, .7), rgba(41, 216, 232, .5), transparent);
}
.site-footer::after {
  content: "";
  position: absolute;
  top: -30%;
  right: -12%;
  width: 46%;
  height: 130%;
  background: radial-gradient(circle at 60% 40%, rgba(123, 92, 255, .16), transparent 62%);
  pointer-events: none;
}

.footer-inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1.7fr) minmax(0, 1.2fr);
  gap: clamp(26px, 4vw, 56px);
}

.footer-brandline {
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: .06em;
  color: var(--text);
}
.footer-subline { margin-top: 10px; font-size: .92rem; color: var(--text-soft); }
.footer-range {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--orbit);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--text-dim);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.footer-col-title {
  margin-bottom: 14px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}
.footer-list { display: flex; flex-direction: column; gap: 10px; }
.footer-link {
  font-size: .92rem;
  color: var(--text-soft);
  transition: color .25s var(--ease), padding-left .25s var(--ease);
}
.footer-link:hover { color: var(--cyan); padding-left: 4px; }

.footer-contact { display: flex; flex-direction: column; gap: 14px; }
.contact-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--orbit);
}
.contact-label {
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--text-dim);
}
.contact-value {
  font-size: .95rem;
  line-height: 1.75;
  color: var(--text);
  word-break: break-word;
}
.contact-note { font-size: 12.5px; line-height: 1.85; color: var(--text-dim); }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  margin-top: clamp(30px, 5vw, 56px);
  padding-top: 20px;
  border-top: 1px solid var(--orbit);
}
.footer-legal { font-size: 12px; letter-spacing: .05em; color: var(--text-dim); }
.footer-note { font-size: 12px; color: var(--text-dim); }

/* 返回顶部 */
.back-to-top {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 70;
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 999px;
  border: 1px solid rgba(41, 216, 232, .45);
  background: rgba(16, 23, 40, .94);
  color: var(--cyan);
  font-size: 1.1rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity .3s var(--ease), transform .3s var(--ease),
              visibility .3s var(--ease), border-color .3s var(--ease);
}
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.back-to-top:hover { border-color: var(--flame); color: var(--flame); }

/* ---------- 卡片：说明牌 / 奶油纸 ---------- */

.plate {
  position: relative;
  padding: clamp(20px, 2.8vw, 32px);
  border: 1px solid var(--orbit);
  border-radius: var(--r-xl);
  background: linear-gradient(180deg, rgba(16, 23, 40, .96), rgba(10, 15, 29, .96));
  transition: transform .35s var(--ease), border-color .35s var(--ease);
}
.plate:hover { transform: translateY(-3px); border-color: rgba(41, 216, 232, .55); }
.plate-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 16px;
  padding-bottom: 14px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--orbit);
}
.plate-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.paper-card {
  padding: clamp(22px, 3.4vw, 42px);
  border-radius: var(--r-xl);
  background: var(--paper);
  color: var(--ink-brown);
  box-shadow: 0 30px 60px -34px rgba(0, 0, 0, .85);
}
.paper-card h2, .paper-card h3, .paper-card h4 { color: var(--ink-brown); }
.paper-card .prose, .paper-card .lede { color: #4A3D2E; }
.paper-card .prose strong { color: var(--ink-brown); }
.paper-card .eyebrow { color: var(--vermilion); }
.paper-card .eyebrow::before { background: linear-gradient(90deg, var(--vermilion), transparent); }
.paper-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 16px;
  margin-bottom: 20px;
  border-bottom: 1px solid rgba(36, 28, 20, .22);
}

/* ---------- 色相筛选胶囊 ---------- */

.chip-row { display: flex; flex-wrap: wrap; gap: 10px; }

.hue-chip {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--orbit);
  background: rgba(16, 23, 40, .82);
  color: var(--text-soft);
  font-size: .86rem;
  font-weight: 600;
  line-height: 1.2;
  transition: background-color .28s var(--ease), color .28s var(--ease),
              border-color .28s var(--ease);
}
.hue-chip::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--hue, var(--nebula));
  box-shadow: 0 0 12px var(--hue, var(--nebula));
}
.hue-chip:hover { color: var(--text); border-color: rgba(41, 216, 232, .5); }
.hue-chip.is-active {
  background: var(--hue, var(--cyan));
  border-color: var(--hue, var(--cyan));
  color: #08101A;
}
.hue-chip.is-active::before { background: #08101A; box-shadow: none; }

/* ---------- 图片容器基础规则 ---------- */

.figure-frame {
  margin: 0;
  border: 1px solid var(--orbit);
  border-radius: var(--r-xl);
  background: var(--ink-deep);
  overflow: hidden;
}
.figure-media {
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: linear-gradient(140deg, #0A1020 0%, #131C33 46%, #1B1436 100%);
}
.figure-media::after {
  content: "";
  position: absolute;
  inset: -12%;
  background:
    radial-gradient(circle at 72% 26%, rgba(123, 92, 255, .34), transparent 56%),
    radial-gradient(circle at 22% 78%, rgba(41, 216, 232, .2), transparent 58%);
  pointer-events: none;
}
.figure-media img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.figure-media--wide { aspect-ratio: 21 / 9; }
.figure-media--tall { aspect-ratio: 4 / 5; }
.figure-caption {
  padding: 12px 18px;
  border-top: 1px solid var(--orbit);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--text-dim);
}

/* ---------- 分隔、面包屑、网格 ---------- */

.orbit-divider {
  height: 1px;
  border: 0;
  margin: clamp(34px, 5vw, 68px) 0;
  background: linear-gradient(90deg, transparent, var(--orbit) 12%, rgba(123, 92, 255, .7) 50%, var(--orbit) 88%, transparent);
}

.breadcrumbs { padding-top: clamp(20px, 3vw, 32px); }
.crumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--text-dim);
}
.crumb-list li { display: inline-flex; align-items: center; }
.crumb-list li + li::before { content: "/"; margin-right: 8px; color: #39425F; }
.crumb-link { color: var(--text-dim); }
.crumb-link:hover { color: var(--cyan); }
.crumb-current { color: var(--text-soft); }

.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(18px, 2.6vw, 32px); }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(18px, 2.6vw, 32px); }
.grid-split {
  display: grid;
  grid-template-columns: minmax(0, .72fr) minmax(0, 1.9fr);
  gap: clamp(22px, 4vw, 56px);
  align-items: start;
}

/* ---------- 显现动画 ---------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */

@media (max-width: 1080px) {
  .header-note { display: none; }
  .footer-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .header-frame { grid-template-columns: minmax(0, 1fr) auto; }
  .nav-toggle { display: inline-flex; }

  .primary-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: auto;
    z-index: 90;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    width: min(88vw, 380px);
    padding: 96px 26px 36px;
    border-left: 1px solid rgba(123, 92, 255, .45);
    background: var(--ink-panel);
    transform: translateX(102%);
    transition: transform .38s var(--ease);
    overflow-y: auto;
  }
  .site-header[data-open="true"] .primary-nav { transform: translateX(0); }

  body.nav-open { overflow: hidden; }

  .nav-list { flex-direction: column; width: 100%; gap: 0; }
  .nav-item { width: 100%; border-bottom: 1px solid var(--orbit); }
  .nav-link { display: block; padding: 15px 2px; font-size: 1.05rem; }
  .nav-link::after { right: auto; bottom: 12px; width: 22px; }

  .header-end {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    margin-top: 22px;
    width: 100%;
  }
  .header-note {
    display: block;
    padding-left: 0;
    border-left: 0;
    white-space: normal;
  }
  .btn-cta { width: 100%; }

  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-split { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 760px) {
  body { font-size: 16px; }
  .grid-2, .grid-3 { grid-template-columns: minmax(0, 1fr); }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-legal, .footer-note { width: 100%; }
}

@media (max-width: 460px) {
  .brand-mark { font-size: 1.02rem; letter-spacing: .06em; }
  .brand-subline { font-size: 10.5px; }
  .footer-nav { grid-template-columns: minmax(0, 1fr); }
  .back-to-top { width: 46px; height: 46px; }
}

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