/* ============================================================
   智方 CloudMatrix - QQ 风格设计系统
   保持与设计稿一致的设计令牌，并扩展交互、动画、响应式
   ============================================================ */

:root {
  /* 主题色 - 与设计稿完全一致 */
  --qq-background: #ffffff;
  --qq-foreground: #1f2937;
  --qq-card: #ffffff;
  --qq-card-foreground: #1f2937;
  --qq-popover: #ffffff;
  --qq-popover-foreground: #1f2937;
  --qq-primary: #2563eb;
  --qq-primary-foreground: #ffffff;
  --qq-muted: #f3f4f6;
  --qq-muted-foreground: #6b7280;
  --qq-border: #e5e7eb;
  --qq-input: #e5e7eb;
  --qq-ring: #2563eb;

  /* 圆角令牌 */
  --qq-radius-sm: 6px;
  --qq-radius-md: 12px;
  --qq-radius-lg: 24px;

  /* 状态色 */
  --qq-state-success: #10b981;
  --qq-state-warning: #f59e0b;
  --qq-state-error: #ef4444;
  --qq-state-info: #3b82f6;

  /* 字体栈 */
  --qq-font-sans: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --qq-font-mono: "SFMono-Regular", "JetBrains Mono", "Fira Code", Consolas, monospace;

  /* 间距阶 */
  --qq-s-1: 4px;
  --qq-s-2: 8px;
  --qq-s-3: 12px;
  --qq-s-4: 16px;
  --qq-s-5: 24px;
  --qq-s-6: 32px;
  --qq-s-7: 48px;
  --qq-s-8: 80px;
  --qq-s-9: 120px;

  /* 阴影 */
  --qq-shadow-1: 0 4px 12px rgba(15, 23, 42, 0.06), 0 1px 3px rgba(15, 23, 42, 0.04);
  --qq-shadow-2: 0 12px 32px -8px rgba(37, 99, 235, 0.22);
  --qq-shadow-3: 0 28px 64px -20px rgba(37, 99, 235, 0.32);

  --qq-footer: #1f2937;

  --qq-hero: #0b1220;
  --qq-hero-glow: #1e3a8a;
  --qq-hero-accent: #2563eb;

  /* Header 滚动状态 */
  --header-h: 64px;
}

/* 暗色模式（系统级，可选禁用） */
@media (prefers-color-scheme: dark) {
  html[data-theme="auto"] {
    --qq-background: #0b1220;
    --qq-foreground: #e5e7eb;
    --qq-card: #111a2e;
    --qq-card-foreground: #e5e7eb;
    --qq-popover: #111a2e;
    --qq-popover-foreground: #e5e7eb;
    --qq-muted: #1e293b;
    --qq-muted-foreground: #94a3b8;
    --qq-border: #1e293b;
    --qq-input: #1e293b;
    --qq-footer: #060b16;
  }
}

/* ============================================================
   基础重置
   ============================================================ */
* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  font-family: var(--qq-font-sans);
  background-color: var(--qq-background);
  color: var(--qq-foreground);
  line-height: 1.6;
  margin: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
:focus-visible {
  outline: 2px solid var(--qq-ring);
  outline-offset: 2px;
  border-radius: 4px;
}

.font-mono { font-family: var(--qq-font-mono); }

/* ============================================================
   语义化颜色类（与 Tailwind tokens 对齐）
   ============================================================ */
.bg-background { background-color: var(--qq-background); }
.text-foreground { color: var(--qq-foreground); }
.border-border { border-color: var(--qq-border); }
.bg-card { background-color: var(--qq-card); }
.text-card-foreground { color: var(--qq-card-foreground); }
.bg-primary { background-color: var(--qq-primary); }
.text-primary { color: var(--qq-primary); }
.text-primary-foreground { color: var(--qq-primary-foreground); }
.bg-muted { background-color: var(--qq-muted); }
.text-muted-foreground { color: var(--qq-muted-foreground); }
.border-input { border-color: var(--qq-input); }
.ring-primary { --tw-ring-color: var(--qq-primary); }

/* ============================================================
   QQ 风格背景与圆角工具类
   ============================================================ */
.bg-qq-footer { background-color: var(--qq-footer); }
.bg-qq-hero {
  background-color: var(--qq-hero);
  background-image:
    radial-gradient(circle at 70% 30%, rgba(37, 99, 235, 0.25) 0%, transparent 55%),
    radial-gradient(circle at 30% 80%, rgba(30, 58, 138, 0.35) 0%, transparent 50%);
}
.rounded-qq-card { border-radius: 32px; }

.shadow-1 { box-shadow: var(--qq-shadow-1); }
.shadow-2 { box-shadow: var(--qq-shadow-2); }
.shadow-3 { box-shadow: var(--qq-shadow-3); }

.no-scrollbar::-webkit-scrollbar { display: none; }
.no-scrollbar { -ms-overflow-style: none; scrollbar-width: none; }

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: background-color .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.site-header.is-scrolled {
  background-color: rgba(255, 255, 255, 0.95);
  border-bottom-color: var(--qq-border);
  box-shadow: 0 1px 0 rgba(15, 23, 42, 0.04);
}
@media (prefers-color-scheme: dark) {
  html[data-theme="auto"] .site-header {
    background-color: rgba(11, 18, 32, 0.85);
  }
  html[data-theme="auto"] .site-header.is-scrolled {
    background-color: rgba(11, 18, 32, 0.95);
  }
}

.nav-link {
  position: relative;
  color: var(--qq-muted-foreground);
  transition: color .2s ease;
}
.nav-link::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 2px;
  background: var(--qq-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s ease;
}
.nav-link:hover { color: var(--qq-primary); }
.nav-link:hover::after,
.nav-link.is-active::after { transform: scaleX(1); }
.nav-link.is-active { color: var(--qq-foreground); }

/* 移动端菜单按钮 */
.menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  border-radius: 10px;
  border: 1px solid var(--qq-border);
  background: var(--qq-card);
  color: var(--qq-foreground);
}
.menu-toggle:hover { color: var(--qq-primary); border-color: var(--qq-primary); }

/* PC（≥768px）不显示移动端菜单按钮与面板——独立于 Tailwind md:hidden 的兜底：
   Tailwind runtime 未加载/失效时也要保证正确隐藏 */
@media (min-width: 768px) {
  #menu-toggle, #mobile-menu { display: none !important; }
}

/* 移动端菜单面板 */
.mobile-menu {
  position: fixed;
  top: var(--header-h);
  left: 0; right: 0;
  background: var(--qq-card);
  border-bottom: 1px solid var(--qq-border);
  box-shadow: var(--qq-shadow-1);
  transform: translateY(-12px);
  opacity: 0;
  visibility: hidden;
  transition: transform .25s ease, opacity .25s ease, visibility .25s ease;
  z-index: 40;
}
.mobile-menu.is-open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}
.mobile-menu a {
  display: block;
  padding: 14px 24px;
  border-bottom: 1px solid var(--qq-border);
  color: var(--qq-foreground);
}
.mobile-menu a:last-child { border-bottom: 0; }
.mobile-menu a:hover { background: var(--qq-muted); color: var(--qq-primary); }

/* ============================================================
   Hero 区
   ============================================================ */
.hero-section {
  position: relative;
  overflow: hidden;
}
.hero-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 18% 20%, rgba(96, 165, 250, 0.15) 0%, transparent 35%),
    radial-gradient(circle at 82% 70%, rgba(37, 99, 235, 0.18) 0%, transparent 40%);
  pointer-events: none;
}
.hero-content { position: relative; z-index: 2; }

.hero-title {
  background: linear-gradient(135deg, #ffffff 0%, #bfdbfe 60%, #60a5fa 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(255, 255, 255, 0.45);
  color: #fff;
  padding: 12px 24px;
  border-radius: 999px;
  font-weight: 500;
  transition: background-color .2s ease, transform .2s ease, border-color .2s ease;
}
.hero-cta:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.8);
  transform: translateY(-2px);
}
.hero-cta:active { transform: translateY(0); }

.hero-visual {
  position: relative;
  width: 100%;
  max-width: 420px;
  aspect-ratio: 1 / 1;
}
.hero-visual img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: 42% 42%;
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* ============================================================
   下载卡片
   ============================================================ */
.download-card {
  background: var(--qq-card);
  border-radius: 32px;
  box-shadow: var(--qq-shadow-1);
  padding: 48px;
  text-align: center;
  transition: box-shadow .3s ease, transform .3s ease;
}
.download-card:hover { box-shadow: var(--qq-shadow-2); }

.os-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 24px 20px;
  border-radius: 20px;
  background: var(--qq-muted);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .2s ease, border-color .2s ease, background-color .2s ease, box-shadow .2s ease;
  position: relative;
}
.os-tile:hover {
  transform: translateY(-4px);
  border-color: var(--qq-primary);
  background: #fff;
  box-shadow: var(--qq-shadow-2);
}
.os-tile img { width: 48px; height: 48px; }
.os-tile .os-name { font-size: 14px; color: var(--qq-muted-foreground); }
.os-tile .os-size { font-size: 12px; color: var(--qq-muted-foreground); opacity: 0.7; }
.os-tile:hover .os-name { color: var(--qq-foreground); }

/* 平台无产物（更新源未登记该平台安装包 / 源不可达）：置灰且不可点 */
.os-tile.is-unavailable {
  opacity: .5;
  cursor: not-allowed;
}
.os-tile.is-unavailable:hover {
  transform: none;
  border-color: transparent;
  background: var(--qq-muted);
  box-shadow: none;
}

/* 多格式切换 chips（如 Linux 同时登记 .deb + .rpm）：span 实现（os-tile 是 button 不可嵌套 button） */
.os-fmts { display: inline-flex; gap: 6px; }
.os-fmt {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  border: 1px solid var(--qq-border);
  font-size: 12px;
  color: var(--qq-muted-foreground);
  cursor: pointer;
  transition: border-color .2s ease, color .2s ease, background-color .2s ease;
}
.os-fmt:hover { border-color: var(--qq-primary); color: var(--qq-primary); }
.os-fmt.is-active {
  border-color: var(--qq-primary);
  color: var(--qq-primary);
  background: rgba(37, 99, 235, 0.08);
  font-weight: 600;
}

/* 下载按钮 */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--qq-primary);
  color: var(--qq-primary-foreground);
  border-radius: 999px;
  font-weight: 600;
  border: 1px solid var(--qq-primary);
  transition: transform .2s ease, box-shadow .2s ease, background-color .2s ease;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--qq-shadow-2);
}
.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  background: transparent;
  color: var(--qq-foreground);
  border: 1px solid var(--qq-border);
  border-radius: 999px;
  font-weight: 500;
  transition: border-color .2s ease, color .2s ease, background-color .2s ease;
}
.btn-ghost:hover { border-color: var(--qq-primary); color: var(--qq-primary); background: var(--qq-muted); }

/* ============================================================
   特性卡片
   ============================================================ */
.feature-card {
  background: var(--qq-card);
  border: 1px solid var(--qq-border);
  border-radius: 20px;
  padding: 28px;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
  height: 100%;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--qq-primary);
  box-shadow: var(--qq-shadow-2);
}
.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px; height: 48px;
  border-radius: 12px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--qq-primary);
  margin-bottom: 16px;
}

/* ============================================================
   FAQ 折叠面板
   ============================================================ */
.faq-item {
  border: 1px solid var(--qq-border);
  border-radius: 16px;
  background: var(--qq-card);
  overflow: hidden;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.faq-item.is-open {
  border-color: var(--qq-primary);
  box-shadow: var(--qq-shadow-1);
}
.faq-question {
  width: 100%;
  text-align: left;
  padding: 18px 24px;
  background: transparent;
  border: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--qq-foreground);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.faq-question:hover { color: var(--qq-primary); }
.faq-question .chev {
  flex-shrink: 0;
  transition: transform .25s ease;
}
.faq-item.is-open .faq-question .chev { transform: rotate(180deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease;
}
.faq-answer-inner {
  padding: 0 24px 20px;
  color: var(--qq-muted-foreground);
  line-height: 1.7;
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  background-color: var(--qq-footer);
  color: #fff;
}
.site-footer a { color: rgba(255, 255, 255, 0.7); transition: color .2s ease; }
.site-footer a:hover { color: #fff; }

/* ============================================================
   滚动入场动画
   ============================================================ */
[data-animate] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .6s ease, transform .6s ease;
  will-change: transform, opacity;
}
[data-animate].is-visible {
  opacity: 1;
  transform: translateY(0);
}
[data-animate][data-animate-delay="1"] { transition-delay: .08s; }
[data-animate][data-animate-delay="2"] { transition-delay: .16s; }
[data-animate][data-animate-delay="3"] { transition-delay: .24s; }
[data-animate][data-animate-delay="4"] { transition-delay: .32s; }

/* Toast 提示 */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--qq-foreground);
  color: var(--qq-background);
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 14px;
  box-shadow: var(--qq-shadow-2);
  opacity: 0;
  visibility: hidden;
  transition: opacity .25s ease, transform .25s ease, visibility .25s ease;
  z-index: 100;
  pointer-events: none;
}
.toast.is-show {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

/* ============================================================
   响应式适配
   ============================================================ */
@media (max-width: 1024px) {
  .download-card { padding: 36px 28px; }
}

@media (max-width: 768px) {
  :root { --header-h: 56px; }

  .download-card {
    padding: 28px 20px;
    border-radius: 24px;
  }
  .download-card .os-row {
    flex-direction: row;
    justify-content: space-between;
    gap: 8px;
  }
  .os-tile {
    flex: 1;
    padding: 16px 8px;
    border-radius: 16px;
  }
  .os-tile img { width: 36px; height: 36px; }
  .os-tile .os-name { font-size: 12px; }
  .os-tile .os-size { font-size: 11px; }

  .hero-visual { max-width: 280px; }
}

@media (max-width: 480px) {
  .download-card { padding: 24px 16px; }
  .os-tile { padding: 12px 4px; }
  .os-tile img { width: 32px; height: 32px; }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
  html { scroll-behavior: auto; }
  .hero-visual img { animation: none; }
  [data-animate] { opacity: 1; transform: none; }
}

/* 打印友好 */
@media print {
  .site-header, .hero-cta, .menu-toggle, .mobile-menu, .toast { display: none !important; }
  .bg-qq-hero { background: #fff !important; color: #000 !important; }
  .hero-title { color: #1e3a8a !important; -webkit-text-fill-color: #1e3a8a; }
}