/* ===========================================================
   spinss 下载站 — 样式表（赛博深色 / Cyber Dark）
   强制深色 · 青(#22d3ee)×紫(#a78bfa)霓虹 · 玻璃拟态 · 粒子场背景
   展示字体：Orbitron（自托管，仅拉丁；中文回退系统字体）
   =========================================================== */

/* ---------- 自托管科幻展示字体（变量字体，覆盖 400–900） ---------- */
@font-face {
  font-family: "Orbitron";
  src: url("assets/fonts/orbitron.woff2") format("woff2");
  font-weight: 400 900;
  font-style: normal;
  font-display: swap;
}

:root {
  /* 底色（深空） */
  --bg: #05060d;
  --bg-alt: #0a0c16;
  --surface: rgba(20, 24, 42, .55);          /* 玻璃面（半透） */
  --surface-solid: #121627;                   /* 不宜半透处（下拉、复制键等） */

  /* 文字 */
  --text: #e6ecff;
  --text-soft: #aab3d6;
  --text-mute: #6f7aa0;

  /* 描边 / 霓虹 */
  --border: rgba(255, 255, 255, .08);
  --border-strong: rgba(255, 255, 255, .14);
  --border-neon: rgba(34, 211, 238, .38);

  /* 主题色：青 × 紫 */
  --primary: #22d3ee;                         /* 霓虹青 */
  --accent: #a78bfa;                          /* 霓虹紫 */
  --primary-600: #22d3ee;
  --primary-700: #0ea5c4;
  --cyan-glow: rgba(34, 211, 238, .5);
  --violet-glow: rgba(167, 139, 250, .5);

  /* 卡片色调（玻璃内霓虹晕） */
  --spinss-tint: rgba(34, 211, 238, .10);
  --mdex-tint: rgba(167, 139, 250, .12);

  /* 阴影（深色下加深） */
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, .35);
  --shadow-md: 0 14px 34px -14px rgba(0, 0, 0, .6);
  --shadow-lg: 0 28px 70px -22px rgba(0, 0, 0, .7);

  --radius: 18px;
  --radius-sm: 11px;
  --maxw: 1080px;

  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas,
    "Roboto Mono", monospace;
  --font-display: "Orbitron", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    sans-serif;
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  /* 底色 + 径向霓虹晕 + 极淡网格，全部固定，铺在 canvas 之下 */
  background-color: var(--bg);
  background-image:
    radial-gradient(60% 50% at 15% -5%, rgba(34, 211, 238, .12), transparent 60%),
    radial-gradient(55% 50% at 100% 8%, rgba(167, 139, 250, .14), transparent 60%),
    radial-gradient(80% 55% at 50% 120%, rgba(99, 102, 241, .10), transparent 60%),
    linear-gradient(rgba(255, 255, 255, .022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .022) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 100% 100%, 46px 46px, 46px 46px;
  background-attachment: fixed;
  background-position: 0 0;
}

/* ---------- 粒子场背景（固定、置于内容下、不挡点击） ---------- */
#bg-particles {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

a { color: inherit; }

::selection { background: rgba(34, 211, 238, .28); color: #fff; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(8, 10, 20, .55);
  backdrop-filter: saturate(150%) blur(14px);
  -webkit-backdrop-filter: saturate(150%) blur(14px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 0 rgba(34, 211, 238, .12);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  height: 64px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: .06em;
}
.brand-mark {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  box-shadow: 0 0 12px var(--cyan-glow), 0 0 0 4px rgba(34, 211, 238, .12);
}
.site-nav { display: flex; gap: 8px; }
.site-nav a {
  text-decoration: none;
  color: var(--text-soft);
  font-size: 14.5px;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: 8px;
  transition: color .15s, background .15s;
}
.site-nav a:hover { color: var(--text); background: rgba(255, 255, 255, .05); }

/* ---------- Hero（若启用） ---------- */
.hero {
  position: relative;
  text-align: center;
  padding: 84px 24px 64px;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 70% at 18% 0%, rgba(34, 211, 238, .18), transparent 70%),
    radial-gradient(55% 60% at 100% 10%, rgba(167, 139, 250, .20), transparent 70%);
  pointer-events: none;
}
.hero-inner { position: relative; }
.eyebrow {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--primary);
  background: rgba(34, 211, 238, .08);
  border: 1px solid var(--border-neon);
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.hero-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(34px, 6vw, 52px);
  line-height: 1.1;
  letter-spacing: .03em;
  background: linear-gradient(110deg, var(--primary), var(--accent) 60%, var(--primary));
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: shimmer 6s linear infinite;
}
@keyframes shimmer { to { background-position: 200% center; } }
.hero-tagline {
  margin: 0 auto;
  max-width: 620px;
  font-size: clamp(16px, 2.2vw, 19px);
  color: var(--text-soft);
}
.hero-tagline strong { color: var(--text); }
.hero-actions {
  margin-top: 30px;
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .12s ease, box-shadow .22s, background .22s, color .22s, border-color .22s;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-lg { padding: 15px 26px; font-size: 16px; }
.btn-block { width: 100%; }
.card-ext-link { margin-left: auto; padding: 7px 12px; font-size: 13.5px; flex: none; }
.card-ext-links { margin-left: auto; display: flex; align-items: center; gap: 8px; flex: none; }
.card-ext-links .card-ext-link { margin-left: 0; }

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #04121a;
  font-weight: 700;
  box-shadow: 0 8px 24px -10px var(--cyan-glow), var(--shadow-md);
}
.btn-primary:hover {
  box-shadow: 0 10px 30px -8px var(--violet-glow), 0 0 0 1px rgba(34, 211, 238, .3);
  transform: translateY(-1px);
}
.btn-ghost {
  background: rgba(255, 255, 255, .03);
  color: var(--text);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}
.btn-ghost:hover {
  border-color: var(--border-neon);
  color: var(--primary);
  background: rgba(34, 211, 238, .08);
  box-shadow: 0 0 0 1px rgba(34, 211, 238, .18), 0 8px 22px -12px var(--cyan-glow);
}
.btn-light {
  background: #eafcff;
  color: #04121a;
  box-shadow: var(--shadow-md);
}

/* ---------- Section ---------- */
.section { padding: 24px 0 80px; }
.section-alt { background: var(--bg-alt); padding: 72px 0; }

/* ---------- 入场动画工具类 ----------
   用独立的 `translate` 属性，把 `transform` 留给卡片 hover 放大，二者互不干扰。 */
.reveal {
  opacity: 0;
  translate: 0 18px;
  transition: opacity .6s cubic-bezier(.2, .7, .2, 1), translate .6s cubic-bezier(.2, .7, .2, 1);
}
.reveal.in { opacity: 1; translate: 0 0; }
/* 卡片错峰入场 */
.cards > .card.reveal:nth-child(1) { transition-delay: .05s; }
.cards > .card.reveal:nth-child(2) { transition-delay: .15s; }
.cards > .card.reveal:nth-child(3) { transition-delay: .25s; }

/* ---------- Cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 34px;
}
.card {
  position: relative;
  isolation: isolate;
  background: var(--surface);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .05), var(--shadow-md);
  display: flex;
  flex-direction: column;
  transition: border-color .25s, box-shadow .3s, transform .3s cubic-bezier(.2, .7, .2, 1);
  overflow: hidden;
}
/* 卡片顶部霓虹细线 */
.card-spinss { border-top: 1px solid var(--border-neon); box-shadow: inset 0 1px 0 rgba(255,255,255,.05), inset 0 1.5px 0 var(--cyan-glow), var(--shadow-md); }
.card-spinss .card-body { margin-top: auto; margin-bottom: auto; }
.card-mdex { border-top: 1px solid var(--border-neon); box-shadow: inset 0 1px 0 rgba(255,255,255,.05), inset 0 1.5px 0 var(--violet-glow), var(--shadow-md); }

/* hover：放大 + 发光描边 + 斜向霓虹扫光（transform 与 .reveal 的 translate 互不冲突） */
.card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(120deg, transparent 32%, rgba(34, 211, 238, .10) 50%, transparent 68%);
  transform: translateX(-130%);
  transition: transform .75s ease;
  pointer-events: none;
  z-index: -1;
}
.card:hover::after { transform: translateX(130%); }
.card:hover {
  transform: scale(1.025);
  z-index: 2;
  border-color: var(--border-neon);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.06), 0 0 0 1px rgba(34, 211, 238, .18), 0 26px 56px -22px rgba(34, 211, 238, .30), var(--shadow-lg);
}

.card-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}
.card-icon {
  width: 48px; height: 48px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  color: var(--primary);
  background: var(--spinss-tint);
  border: 1px solid var(--border);
  box-shadow: inset 0 0 18px rgba(34, 211, 238, .12);
  flex: none;
}
.card-mdex .card-icon {
  color: var(--accent);
  background: var(--mdex-tint);
  box-shadow: inset 0 0 18px rgba(167, 139, 250, .16);
}
.card-icon-img { overflow: hidden; padding: 0; }
.card-icon-img img {
  width: 48px;
  height: 48px;
  min-width: 0;
  object-fit: cover;
  display: block;
}

.card-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: .04em;
  background: linear-gradient(110deg, var(--text), var(--primary) 78%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.card-title .ver {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--primary);
  background: rgba(34, 211, 238, .08);
  border: 1px solid var(--border-neon);
  padding: 2px 9px;
  border-radius: 999px;
  margin-inline-start: 8px;
  vertical-align: middle;
  white-space: nowrap;
  -webkit-text-fill-color: var(--primary);
}
.card-sub { margin: 2px 0 0; font-size: 13.5px; color: var(--text-mute); }
.card-desc { margin: 0 0 16px; color: var(--text-soft); font-size: 15px; }
.card-meta {
  margin: 0 0 16px;
  font-size: 13px;
  color: var(--text-mute);
}
.card-meta span { color: var(--text); font-weight: 600; }

.alt-links {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 14px;
  font-size: 13.5px;
  color: var(--text-mute);
}
.alt-links a {
  text-decoration: none;
  color: var(--primary);
  font-weight: 500;
}
.alt-links a:hover { text-decoration: underline; }

/* ---------- Tabs (mdex) ---------- */
.tabs {
  display: inline-flex;
  background: rgba(255, 255, 255, .03);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 4px;
  margin-bottom: 18px;
  align-self: flex-start;
}
.tab {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--text-soft);
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  padding: 7px 16px;
  border-radius: 7px;
  cursor: pointer;
  transition: background .2s, color .2s, box-shadow .2s;
}
.tab:hover { color: var(--text); }
/* 选中的 OS 标签：与「访问 AI 智慧学院」同款的青→紫霓虹渐变 */
.tab.active {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #04121a;
  font-weight: 700;
  box-shadow: 0 8px 22px -10px var(--cyan-glow), 0 0 0 1px rgba(34, 211, 238, .25);
}
.tabs-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  column-gap: 14px;
  row-gap: 8px;
  align-self: flex-start;
  margin-bottom: 18px;
}
.tabs-row .tabs { align-self: auto; margin-bottom: 0; }
.tab-total {
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-mute);
  white-space: nowrap;
}

.tab-panels { display: flex; flex-direction: column; gap: 10px; }
.panel { display: flex; flex-direction: column; gap: 10px; animation: fade .25s ease; }
.panel[hidden] { display: none; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

.os-line {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 2px;
}
.os-icon { color: var(--text-soft); display: inline-flex; }
.os-text { font-size: 14px; color: var(--text-soft); font-weight: 500; }

/* MDeX 下载按钮：默认玻璃，悬停时整项变青紫霓虹 */
.card-mdex .panel .btn-ghost:hover,
.card-mdex .panel .btn-ghost:focus-visible {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #04121a;
  font-weight: 700;
  border-color: transparent;
  box-shadow: 0 10px 26px -10px var(--cyan-glow), var(--shadow-md);
  transform: translateY(-1px);
}

/* ---------- About ---------- */
.about-inner { text-align: center; max-width: 680px; margin: 0 auto; }
.about-eyebrow {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.about-title { margin: 0 0 12px; font-family: var(--font-display); font-weight: 700; font-size: clamp(26px, 4vw, 34px); letter-spacing: .02em; }
.about-desc { margin: 0 auto 26px; color: var(--text-soft); font-size: 16px; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  color: var(--text-mute);
  font-size: 14px;
  background: rgba(8, 10, 20, .4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}
.footer-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-inner a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}
.footer-inner a:hover { text-decoration: underline; }

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
  .cards { grid-template-columns: 1fr; gap: 22px; }
  /* 卡片头部的外链按钮在窄屏下独占一行，避免被 .card 的 overflow:hidden 裁切（GitHub 按钮曾因此被遮挡） */
  .card-head > .card-ext-link,
  .card-head .card-ext-links { width: 100%; margin-left: 0; }
  .card-head .card-ext-links .card-ext-link { flex: 1 1 0; }
  .site-nav { gap: 2px; }
  .site-nav a { padding: 8px; font-size: 14px; }
  .lang-menu { min-width: 130px; }
}

/* ---------- 顶部留白 ---------- */
#downloads.section { padding-top: 64px; }

/* ---------- 语言切换器 ---------- */
.lang-switch { position: relative; }
.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, .03);
  color: var(--text-soft);
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  padding: 8px 12px;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: border-color .15s, color .15s, box-shadow .2s;
}
.lang-btn:hover { border-color: var(--border-neon); color: var(--primary); box-shadow: 0 0 0 1px rgba(34,211,238,.15); }
.lang-chev { transition: transform .15s; }
.lang-btn[aria-expanded="true"] .lang-chev { transform: rotate(180deg); }
.lang-menu {
  position: absolute;
  top: calc(100% + 8px);
  inset-inline-end: 0;
  margin: 0;
  padding: 6px;
  list-style: none;
  background: var(--surface-solid);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(34, 211, 238, .08);
  min-width: 150px;
  z-index: 60;
  display: grid;
  gap: 2px;
  max-height: min(70vh, 460px);
  overflow-y: auto;
}
.lang-menu[hidden] { display: none; }
.lang-opt {
  width: 100%;
  text-align: start;
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--text-soft);
  font: inherit;
  font-size: 14px;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: background .12s, color .12s;
}
.lang-opt:hover { background: rgba(34, 211, 238, .10); color: var(--text); }
.lang-opt.active { color: var(--primary); font-weight: 700; }

/* ---------- AI 智慧学院 卡片（宽幅） ---------- */
.card-about { border-top: 1px solid var(--border-neon); box-shadow: inset 0 1px 0 rgba(255,255,255,.05), inset 0 1.5px 0 var(--violet-glow), var(--shadow-md); }
.card-about .card-icon { color: var(--accent); background: var(--mdex-tint); box-shadow: inset 0 0 18px rgba(167, 139, 250, .16); }
.card-wide {
  grid-column: 1 / -1;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.card-wide .card-wide-body { min-width: 0; flex: 1 1 320px; }
.card-wide .card-desc { margin-bottom: 0; }
.card-wide .btn { flex: none; }
@media (max-width: 760px) {
  .card-wide { flex-direction: column; align-items: stretch; }
  .card-wide .btn { width: 100%; }
}

/* ---------- 页脚（备案号 + 隐私政策） ---------- */
.footer-inner { justify-content: center; }
.site-footer .footer-icp,
.site-footer .footer-privacy { color: var(--text-mute); text-decoration: none; }
.site-footer .footer-icp:hover,
.site-footer .footer-privacy:hover { text-decoration: underline; }

/* ---------- 下载项 + 内联校验值 ---------- */
.dl-item { display: flex; flex-direction: column; gap: 4px; }
.dl-checksum {
  direction: ltr;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 4px;
}
.dl-checksum::before {
  content: "SHA-256";
  flex: none;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--primary);
  opacity: .8;
}
.dl-checksum-hash {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--text-mute);
  min-width: 0;
}
.dl-copy {
  margin-left: auto;
  flex: none;
  appearance: none;
  border: 1px solid var(--border-strong);
  background: rgba(255, 255, 255, .03);
  color: var(--text-soft);
  font: inherit;
  font-size: 12px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  cursor: pointer;
  transition: background .12s, color .12s, border-color .12s;
}
.dl-copy:hover { border-color: var(--border-neon); color: var(--primary); }
.dl-copy.copied { background: var(--primary); color: #04121a; border-color: transparent; }
.dl-count {
  flex: none;
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 600;
  color: var(--text-mute);
  font-variant-numeric: tabular-nums;   /* 滚动计数时数字等宽，不抖动 */
}

/* ---------- 降低动态偏好：关停一切动效，内容直接可见 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1 !important; translate: none !important; transition-delay: 0s !important; }
  .card:hover { transform: none !important; }
  .card::after { display: none; }
}