/* ============================================================
 * Gleam 官网 — 设计系统（与 Web UI 同源）
 * 深色玻璃拟态 + 状态绿 CTA + Fira Sans/Code
 * ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@400;500;600&family=Fira+Sans:wght@300;400;500;600;700&display=swap');

:root {
  --color-bg: #0F172A;
  --color-card: #1B2336;
  --color-muted: #272F42;
  --color-border: #475569;
  --glass-border: rgba(255, 255, 255, 0.10);
  --glass-highlight: rgba(255, 255, 255, 0.05);
  --color-fg: #F8FAFC;
  --color-fg-muted: #94A3B8;
  --color-accent: #22C55E;
  --color-on-accent: #0F172A;
  --color-destructive: #EF4444;
  --color-warning: #EAB308;
  --color-info: #38BDF8;

  --font-sans: 'Fira Sans', -apple-system, 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', sans-serif;
  --font-mono: 'Fira Code', ui-monospace, Consolas, monospace;
  --fs-xs: 12px;
  --fs-sm: 14px;
  --fs-md: 16px;
  --fs-lg: 19px;
  --fs-xl: 24px;
  --fs-2xl: 34px;
  --fs-3xl: 52px;

  --space-2: 8px; --space-3: 12px; --space-4: 16px;
  --space-5: 24px; --space-6: 32px; --space-7: 48px; --space-8: 80px;

  --radius-sm: 6px; --radius-md: 12px; --radius-lg: 18px; --radius-full: 999px;
  --blur: 14px;
  --shadow-1: 0 1px 2px rgba(2, 6, 23, 0.4);
  --shadow-2: 0 8px 24px rgba(2, 6, 23, 0.45);
  --shadow-3: 0 16px 48px rgba(2, 6, 23, 0.55);
  --dur-fast: 150ms; --dur-base: 220ms; --dur-slow: 320ms;
  --ease-out: cubic-bezier(0.2, 0, 0, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(1400px 600px at 85% -10%, rgba(34, 197, 94, 0.08), transparent 60%),
    radial-gradient(1000px 500px at 5% 30%, rgba(56, 189, 248, 0.05), transparent 60%),
    var(--color-bg);
  color: var(--color-fg);
  font-family: var(--font-sans);
  font-size: var(--fs-md);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--color-bg), 0 0 0 4px var(--color-accent);
  border-radius: var(--radius-sm);
}
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: var(--radius-full); }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ---------- 顶栏 ---------- */
.topbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(15, 23, 42, 0.78);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border-bottom: 1px solid var(--glass-border);
}
.topbar-inner {
  max-width: 1160px; margin: 0 auto; padding: var(--space-3) var(--space-5);
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-4);
}
.brand { display: flex; align-items: center; gap: var(--space-3); text-decoration: none; color: var(--color-fg); }
.brand-logo {
  width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center;
  color: var(--color-on-accent);
  background: linear-gradient(135deg, var(--color-accent), #16A34A);
  box-shadow: 0 0 20px rgba(34, 197, 94, 0.35);
}
.brand-text { font-size: var(--fs-lg); font-weight: 700; }
.brand-text em { font-style: normal; color: var(--color-fg-muted); font-weight: 400; font-size: var(--fs-sm); margin-left: 4px; }
.topnav { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.topnav a {
  color: var(--color-fg-muted); text-decoration: none; font-size: var(--fs-sm);
  padding: var(--space-2) var(--space-3); border-radius: var(--radius-sm);
  transition: color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}
.topnav a:hover { color: var(--color-fg); background: var(--glass-highlight); }

/* ---------- Hero ---------- */
.hero { padding: var(--space-8) var(--space-5) var(--space-7); }
.hero-inner { max-width: 1160px; margin: 0 auto; text-align: center; }
.hero-kicker {
  display: inline-block; margin: 0 0 var(--space-4);
  padding: 4px var(--space-3); border-radius: var(--radius-full);
  border: 1px solid rgba(34, 197, 94, 0.35); color: var(--color-accent);
  font-size: var(--fs-xs); letter-spacing: 1px;
}
.hero h1 { font-size: var(--fs-3xl); margin: 0 0 var(--space-4); font-weight: 700; letter-spacing: 1px; }
.hero .grad {
  background: linear-gradient(120deg, var(--color-accent), var(--color-info));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub { color: var(--color-fg-muted); font-size: var(--fs-lg); max-width: 720px; margin: 0 auto var(--space-5); }
.hero-sub strong { color: var(--color-fg); }
.hero-actions { display: flex; gap: var(--space-3); justify-content: center; margin-bottom: var(--space-7); }
.hero-stats {
  display: flex; justify-content: center; gap: var(--space-6); flex-wrap: wrap;
  margin: 0 auto; padding: var(--space-4) var(--space-5);
  max-width: 900px;
  background: rgba(27, 35, 54, 0.55);
  border: 1px solid var(--glass-border); border-radius: var(--radius-lg);
  backdrop-filter: blur(var(--blur)); -webkit-backdrop-filter: blur(var(--blur));
}
.hero-stats div { text-align: center; min-width: 96px; }
.hero-stats dt { font-family: var(--font-mono); font-size: var(--fs-xl); font-weight: 600; color: var(--color-accent); }
.hero-stats dd { margin: 0; color: var(--color-fg-muted); font-size: var(--fs-xs); }

/* ---------- 截图展示 ---------- */
.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-5);
  margin-top: var(--space-5);
}
.screenshot-card {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-card);
  border: 1px solid var(--glass-border);
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
.screenshot-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-3);
  border-color: rgba(255,255,255,0.12);
}
.screenshot-card img {
  width: 100%;
  height: auto;
  display: block;
  border-bottom: 1px solid var(--glass-border);
}
.screenshot-card figcaption {
  margin: 0;
  padding: var(--space-3) var(--space-4);
  font-size: var(--fs-sm);
  color: var(--color-fg-muted);
  text-align: center;
}

/* ---------- 通用 section ---------- */
.section { padding: var(--space-8) var(--space-5); }
.section-inner { max-width: 1160px; margin: 0 auto; }
.section h2 { font-size: var(--fs-2xl); margin: 0 0 var(--space-2); }
.section-sub { color: var(--color-fg-muted); margin: 0 0 var(--space-6); }
.dl-meta {
  display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2) var(--space-4);
  color: var(--color-fg-muted); font-size: var(--fs-sm);
  margin: calc(-1 * var(--space-4)) 0 var(--space-6);
}
.dl-ver {
  color: var(--color-fg); font-weight: 600; font-variant-numeric: tabular-nums;
  padding: 2px var(--space-3); border: 1px solid var(--glass-border);
  border-radius: var(--radius-full); background: var(--glass-highlight);
}
.group-title {
  font-size: var(--fs-sm); letter-spacing: 2px; text-transform: uppercase;
  color: var(--color-accent); margin: var(--space-6) 0 var(--space-4);
}
.grid-3 { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: var(--space-4); }

/* ---------- 卡片 ---------- */
.card {
  background: var(--color-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  transition: border-color var(--dur-fast) var(--ease-out), transform var(--dur-base) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}
.card:hover { border-color: var(--color-border); transform: translateY(-2px); box-shadow: var(--shadow-2); }
.pillar-no { font-family: var(--font-mono); color: var(--color-accent); font-size: var(--fs-sm); margin-bottom: var(--space-2); }
.pillar h3 { margin: 0 0 var(--space-2); font-size: var(--fs-lg); }
.card p { margin: 0 0 var(--space-2); color: var(--color-fg-muted); font-size: var(--fs-sm); }
.card strong { color: var(--color-fg); }
.card ul { margin: 0; padding-left: var(--space-4); color: var(--color-fg-muted); font-size: var(--fs-xs); }
.card li { margin: 2px 0; }
.mod-icon {
  width: 42px; height: 42px; border-radius: 10px; display: grid; place-items: center;
  background: rgba(34, 197, 94, 0.12); color: var(--color-accent); margin-bottom: var(--space-3);
}
.mod-icon svg { width: 20px; height: 20px; }
.mod h4 { margin: 0 0 var(--space-2); font-size: var(--fs-md); }

/* ---------- 架构图 ---------- */
.arch { display: flex; flex-direction: column; gap: var(--space-2); max-width: 860px; margin: 0 auto; }
.arch-layer {
  background: rgba(27, 35, 54, 0.6);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}
.arch-layer--core {
  border-color: rgba(34, 197, 94, 0.35);
  background: rgba(34, 197, 94, 0.05);
  box-shadow: 0 0 32px rgba(34, 197, 94, 0.08) inset;
}
.arch-label {
  font-size: var(--fs-xs); letter-spacing: 2px; color: var(--color-fg-muted);
  margin-bottom: var(--space-3); text-transform: uppercase;
}
.arch-layer--core .arch-label { color: var(--color-accent); }
.arch-boxes { display: flex; gap: var(--space-2); justify-content: center; flex-wrap: wrap; margin-bottom: var(--space-2); }
.arch-boxes:last-child { margin-bottom: 0; }
.arch-box {
  background: var(--color-card); border: 1px solid var(--color-border);
  border-radius: var(--radius-sm); padding: var(--space-2) var(--space-4);
  text-align: center; font-size: var(--fs-sm);
}
.arch-box small { color: var(--color-fg-muted); font-size: var(--fs-xs); }
.arch-wide { flex: 1; min-width: 200px; }
.arch-link { border: none; color: var(--color-accent); font-weight: 700; }
.arch-connector {
  text-align: center; color: var(--color-fg-muted); font-size: var(--fs-xs);
  font-family: var(--font-mono); padding: 2px 0;
}

/* ---------- 演示 ---------- */
.demo { max-width: 820px; margin: 0 auto; }
.demo-pick { display: flex; gap: var(--space-2); flex-wrap: wrap; margin-bottom: var(--space-4); }
.chip {
  padding: var(--space-2) var(--space-4); min-height: 36px;
  border-radius: var(--radius-full); border: 1px solid var(--color-border);
  background: transparent; color: var(--color-fg-muted);
  font-family: inherit; font-size: var(--fs-sm); cursor: pointer;
  transition: all var(--dur-fast) var(--ease-out);
}
.chip:hover { color: var(--color-fg); border-color: var(--color-fg-muted); }
.chip[aria-pressed="true"] {
  background: rgba(34, 197, 94, 0.14); color: var(--color-accent);
  border-color: rgba(34, 197, 94, 0.5); font-weight: 600;
}
.demo-bar { display: flex; gap: var(--space-3); align-items: center; margin-bottom: var(--space-3); }
.demo-goal {
  flex: 1; font-family: var(--font-mono); font-size: var(--fs-sm);
  background: var(--color-bg); border: 1px solid var(--color-border);
  border-radius: var(--radius-sm); padding: var(--space-3);
  min-height: 44px; display: flex; align-items: center;
}
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  min-height: 44px; padding: 0 var(--space-5);
  border-radius: var(--radius-sm); border: 1px solid transparent;
  font-family: inherit; font-size: var(--fs-md); font-weight: 600; cursor: pointer;
  text-decoration: none;
  transition: all var(--dur-fast) var(--ease-out);
}
.btn:active:not(:disabled) { transform: scale(0.97); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--color-accent); color: var(--color-on-accent); }
.btn-primary:hover:not(:disabled) { background: #4ADE80; }
.btn-secondary { background: transparent; color: var(--color-fg); border-color: var(--color-border); }
.btn-secondary:hover:not(:disabled) { background: var(--color-muted); }
.btn-danger { background: rgba(239, 68, 68, 0.14); color: var(--color-destructive); }
.btn-danger:hover:not(:disabled) { background: var(--color-destructive); color: #fff; }

.demo-progress {
  height: 6px; border-radius: var(--radius-full);
  background: rgba(34, 197, 94, 0.12); overflow: hidden; margin-bottom: var(--space-4);
}
.demo-progress-bar {
  height: 100%; width: 0; border-radius: inherit;
  background: linear-gradient(90deg, #16A34A, var(--color-accent));
  transition: width var(--dur-slow) var(--ease-out);
}
.timeline { position: relative; padding-left: var(--space-5); min-height: 20px; }
.timeline::before {
  content: ""; position: absolute; left: 6px; top: 4px; bottom: 4px;
  width: 2px; background: var(--glass-border); border-radius: 1px;
}
.timeline-item { position: relative; padding: var(--space-1) 0; font-size: var(--fs-sm); animation: item-in var(--dur-base) var(--ease-out); }
.timeline-item::before {
  content: ""; position: absolute; left: calc(-1 * var(--space-5) + 1px);
  top: 10px; width: 12px; height: 12px; border-radius: var(--radius-full);
  background: var(--color-card); border: 2px solid var(--color-border);
}
.timeline-item--done::before { background: var(--color-accent); border-color: transparent; }
.timeline-item--error::before { background: var(--color-destructive); border-color: transparent; }
.timeline-item--active::before { border-color: var(--color-accent); animation: dot-pulse 1.6s var(--ease-out) infinite; }
@keyframes dot-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.35); }
  50% { box-shadow: 0 0 0 5px rgba(34, 197, 94, 0.18); }
}
@keyframes item-in { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
.tl-kind {
  color: var(--color-accent); font-family: var(--font-mono);
  font-size: var(--fs-xs); margin-right: var(--space-2);
  text-transform: uppercase; letter-spacing: 1px;
}
.tl-kind--execute { color: var(--color-info); }
.tl-kind--reflect { color: var(--color-warning); }

.demo-approval {
  margin: var(--space-3) 0; padding: var(--space-4);
  background: rgba(239, 68, 68, 0.06);
  border: 1px solid rgba(239, 68, 68, 0.35); border-radius: var(--radius-md);
}
.demo-approval-head { display: flex; align-items: center; gap: var(--space-2); font-weight: 700; margin-bottom: var(--space-2); }
.badge {
  display: inline-flex; padding: 2px var(--space-2); border-radius: var(--radius-full);
  font-size: var(--fs-xs); font-weight: 600;
}
.badge--high { background: rgba(239, 68, 68, 0.14); color: var(--color-destructive); }
.demo-approval-actions { display: flex; gap: var(--space-2); margin-top: var(--space-3); }

.demo-result[hidden] { display: none; }
.demo-result {
  display: flex; align-items: center; gap: var(--space-4);
  margin-top: var(--space-4); padding: var(--space-4);
  background: rgba(34, 197, 94, 0.07);
  border: 1px solid rgba(34, 197, 94, 0.25); border-radius: var(--radius-md);
}
.score-ring { width: 56px; height: 56px; flex-shrink: 0; }
.score-ring .ring-bg { fill: none; stroke: var(--color-muted); stroke-width: 3.4; }
.score-ring .ring-fg {
  fill: none; stroke: var(--color-accent); stroke-width: 3.4; stroke-linecap: round;
  transform: rotate(-90deg); transform-origin: center;
  transition: stroke-dashoffset 900ms var(--ease-out);
}
.score-ring text { fill: var(--color-fg); font-size: 10px; font-weight: 600; font-family: var(--font-mono); }
.demo-summary { color: var(--color-fg); font-size: var(--fs-sm); white-space: pre-wrap; }

/* ---------- 快速开始 ---------- */
.qs { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: var(--space-4); }
.qs-step { display: flex; gap: var(--space-4); align-items: flex-start; }
.qs-no {
  width: 34px; height: 34px; flex-shrink: 0; border-radius: var(--radius-full);
  display: grid; place-items: center;
  background: rgba(34, 197, 94, 0.14); color: var(--color-accent);
  font-family: var(--font-mono); font-weight: 700;
}
.qs-step h4 { margin: 0 0 var(--space-2); font-size: var(--fs-md); }
.qs-step pre {
  margin: 0; padding: var(--space-3) var(--space-4);
  background: var(--color-bg); border: 1px solid var(--color-border);
  border-radius: var(--radius-sm); overflow-x: auto;
}
.qs-step code { font-family: var(--font-mono); font-size: var(--fs-sm); color: var(--color-fg); }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--glass-border); padding: var(--space-6) var(--space-5); margin-top: var(--space-7); }
.footer-inner {
  max-width: 1160px; margin: 0 auto;
  display: flex; justify-content: space-between; gap: var(--space-4); flex-wrap: wrap;
  color: var(--color-fg-muted); font-size: var(--fs-sm);
}
.footer p { margin: var(--space-1) 0 0; color: var(--color-fg-muted); }
.footer-links { display: flex; gap: var(--space-4); align-items: center; }
.footer-links a { color: var(--color-fg-muted); text-decoration: none; }
.footer-links a:hover { color: var(--color-accent); }

/* ---------- 滚动显现 ---------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity 600ms var(--ease-out), transform 600ms var(--ease-out); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
  .hero h1 { font-size: var(--fs-2xl); }
  .hero-sub { font-size: var(--fs-md); }
  .topnav { display: none; }
  .section { padding: var(--space-7) var(--space-4); }
  .hero-stats { gap: var(--space-4); }
  .demo-bar { flex-direction: column; align-items: stretch; }
}


/* ============ 下载区 ============ */
.dl-platforms {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-5);
  margin: var(--space-6) 0;
}
.dl-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: border-color var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
}
.dl-card:hover {
  border-color: rgba(var(--accent-rgb) / 0.3);
  box-shadow: var(--shadow-2);
  transform: translateY(-2px);
}
.dl-card--recommended {
  border-color: rgba(var(--accent-rgb) / 0.35);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb) / 0.08);
}
.dl-card-head {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}
.dl-platform-icon {
  width: 48px; height: 48px;
  display: grid; place-items: center;
  border-radius: var(--radius-md);
  background: rgba(var(--accent-rgb) / 0.1);
  color: var(--color-accent);
}
.dl-card--windows .dl-platform-icon { color: #38BDF8; background: rgba(56, 189, 248, 0.1); }
.dl-card--macos .dl-platform-icon { color: #A78BFA; background: rgba(167, 139, 250, 0.1); }
.dl-card--linux .dl-platform-icon { color: #FBBF24; background: rgba(251, 191, 36, 0.1); }
.dl-card h3 { font-size: var(--fs-lg); font-weight: 600; margin: 0; }
.dl-arch { font-size: var(--fs-xs); color: var(--color-fg-muted); display: block; margin-top: 2px; }

.dl-downloads { display: flex; flex-direction: column; gap: var(--space-3); }
.dl-btn {
  display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.03);
  color: var(--color-fg);
  text-decoration: none;
  transition: background var(--dur-fast) ease, border-color var(--dur-fast) ease, transform var(--dur-fast) var(--ease-out);
}
.dl-btn:hover {
  background: rgba(var(--accent-rgb) / 0.08);
  border-color: rgba(var(--accent-rgb) / 0.25);
  transform: translateY(-1px);
}
.dl-btn--primary {
  background: rgba(var(--accent-rgb) / 0.12);
  border-color: rgba(var(--accent-rgb) / 0.3);
  color: var(--color-accent);
}
.dl-btn--primary:hover {
  background: rgba(var(--accent-rgb) / 0.18);
}
.dl-btn span:first-of-type { font-weight: 600; font-size: var(--fs-md); }
.dl-size { margin-left: auto; font-size: var(--fs-xs); color: var(--color-fg-muted); font-family: var(--font-mono); }

.dl-note { margin-top: var(--space-3); }
.dl-tip {
  font-size: var(--fs-sm);
  color: var(--color-accent);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  background: rgba(var(--accent-rgb) / 0.08);
  margin: 0 0 var(--space-3);
  display: none;
}
.dl-tip--show { display: block; }
.dl-guide { font-size: var(--fs-sm); color: var(--color-fg-muted); }
.dl-guide summary { cursor: pointer; color: var(--color-fg); font-weight: 500; padding: var(--space-2) 0; }
.dl-guide summary:hover { color: var(--color-accent); }
.dl-guide ol { margin: var(--space-2) 0 0; padding-left: var(--space-5); line-height: 1.8; }
.dl-guide li { margin-bottom: var(--space-1); }
.dl-guide code { font-family: var(--font-mono); font-size: var(--fs-xs); background: rgba(0,0,0,0.3); padding: 2px 6px; border-radius: 4px; }

.dl-other {
  margin-top: var(--space-6);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--glass-border);
}
.dl-other p { font-size: var(--fs-sm); color: var(--color-fg-muted); margin: 0 0 var(--space-2); }
.dl-other p:last-child { margin: 0; }
.dl-source { font-size: var(--fs-xs) !important; }
.dl-source code { font-family: var(--font-mono); background: rgba(0,0,0,0.3); padding: 2px 6px; border-radius: 4px; }

@media (max-width: 700px) {
  .dl-platforms { grid-template-columns: 1fr; }
  .dl-btn { flex-direction: row; }
}

/* ============================================================
 * 2026-09-07 优化：Impeccable & MattPocock Skills 指导
 * 目标：减少 AI 模板感，增加温度与材质感
 * ============================================================ */

/* ---- 背景：添加微妙的噪点纹理，增加物理质感 ---- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---- Hero 区域：更丰富的层次和呼吸感 ---- */
.hero {
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: '';
  position: absolute;
  top: 60%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 400px;
  background: radial-gradient(ellipse, rgba(34, 197, 94, 0.06), transparent 70%);
  pointer-events: none;
  z-index: 0;
}
.hero-inner { position: relative; z-index: 1; }

/* ---- Hero 标题：更克制的入场动画 ---- */
.hero h1 {
  background: linear-gradient(135deg, #F8FAFC 0%, rgba(248, 250, 252, 0.85) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero h1 .grad {
  background: linear-gradient(135deg, var(--color-accent), #4ADE80);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ---- 按钮：更有质感的交互 ---- */
.btn-primary {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-accent), #16A34A);
  box-shadow: 0 4px 14px rgba(34, 197, 94, 0.25), inset 0 1px rgba(255,255,255,0.1);
  transition: all var(--dur-fast) var(--ease-out);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(34, 197, 94, 0.35), inset 0 1px rgba(255,255,255,0.15);
  filter: brightness(1.05);
}
.btn-primary:active {
  transform: translateY(0) scale(0.98);
  box-shadow: 0 2px 8px rgba(34, 197, 94, 0.2);
}
.btn-secondary {
  border-color: rgba(255,255,255,0.15);
  background: rgba(255,255,255,0.03);
  transition: all var(--dur-fast) var(--ease-out);
}
.btn-secondary:hover {
  background: rgba(255,255,255,0.07);
  border-color: rgba(255,255,255,0.25);
}

/* ---- 卡片：增加微妙的悬浮光效 ---- */
.card {
  position: relative;
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
.card::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(255,255,255,0.06), transparent 50%, rgba(255,255,255,0.03));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--dur-base) var(--ease-out);
  pointer-events: none;
}
.card:hover::before {
  opacity: 1;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-3), 0 0 40px rgba(34, 197, 94, 0.06);
  border-color: rgba(255,255,255,0.12);
}

/* ---- 支柱卡片：更有层次感的序号 ---- */
.pillar-no {
  display: inline-block;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.2);
  margin-bottom: var(--space-3);
  font-weight: 600;
}

/* ---- 演示区域：更沉浸的暗色氛围 ---- */
.demo {
  background: linear-gradient(180deg, rgba(27, 35, 54, 0.8), rgba(15, 23, 42, 0.95));
  border: 1px solid rgba(255,255,255,0.06);
  box-shadow: inset 0 1px rgba(255,255,255,0.03), 0 20px 60px rgba(0,0,0,0.3);
}
.chip {
  transition: all var(--dur-fast) var(--ease-out);
  border-color: rgba(255,255,255,0.1);
}
.chip:hover {
  border-color: rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.03);
}
.chip[aria-pressed="true"] {
  background: rgba(34, 197, 94, 0.15);
  border-color: rgba(34, 197, 94, 0.4);
  box-shadow: 0 0 20px rgba(34, 197, 94, 0.1);
}

/* ---- 下载卡片：平台标识色更克制 ---- */
.dl-card {
  position: relative;
  overflow: hidden;
}
.dl-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), #4ADE80, var(--color-accent));
  opacity: 0.6;
  transition: opacity var(--dur-base) var(--ease-out);
}
.dl-card:hover::after {
  opacity: 1;
}
.dl-card--windows::after {
  background: linear-gradient(90deg, #38BDF8, #60A5FA);
}
.dl-card--macos::after {
  background: linear-gradient(90deg, #A78BFA, #C4B5FD);
}
.dl-card--linux::after {
  background: linear-gradient(90deg, #FBBF24, #FCD34D);
}

/* ---- 下载按钮：更清晰的视觉反馈 ---- */
.dl-btn {
  transition: all var(--dur-fast) var(--ease-out);
}
.dl-btn--primary {
  background: rgba(34, 197, 94, 0.1);
  border-color: rgba(34, 197, 94, 0.3);
  color: var(--color-accent);
}
.dl-btn--primary:hover {
  background: rgba(34, 197, 94, 0.15);
  border-color: rgba(34, 197, 94, 0.45);
  transform: translateY(-1px);
}

/* ---- 快速开始：步骤连接线更有设计感 ---- */
.qs-step {
  position: relative;
  padding-left: 24px;
}
.qs-step::before {
  content: '';
  position: absolute;
  left: 16px;
  top: 40px;
  bottom: -16px;
  width: 1px;
  background: linear-gradient(180deg, var(--color-accent), rgba(34, 197, 94, 0.1));
}
.qs-step:last-child::before {
  display: none;
}
.qs-no {
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.15);
  transition: all var(--dur-fast) var(--ease-out);
}
.qs-step:hover .qs-no {
  box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.2);
  transform: scale(1.05);
}

/* ---- 滚动显现：更柔和的入场 ---- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

/* ---- 底部区域更有温度 ---- */
.footer {
  border-top: 1px solid rgba(255,255,255,0.05);
  background: linear-gradient(180deg, transparent, rgba(0,0,0,0.2));
}

/* ---- 导航栏：更精致的毛玻璃效果 ---- */
.topbar {
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.topnav a {
  position: relative;
  transition: color var(--dur-fast) var(--ease-out);
}
.topnav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
  transition: transform var(--dur-fast) var(--ease-out);
}
.topnav a:hover::after {
  transform: translateX(-50%) scaleX(1);
}

/* ---- 指标卡片：更克制的呼吸灯 ---- */
.hero-stats dt {
  background: linear-gradient(135deg, var(--color-accent), #4ADE80);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ---- 架构图：更清晰的层次 ---- */
.arch-layer--core {
  border-color: rgba(34, 197, 94, 0.25);
  background: linear-gradient(180deg, rgba(34, 197, 94, 0.04), rgba(34, 197, 94, 0.02));
}
.arch-box {
  transition: all var(--dur-fast) var(--ease-out);
}
.arch-box:hover {
  border-color: rgba(255,255,255,0.2);
  transform: translateY(-2px);
}

/* ---- 响应式优化 ---- */
@media (max-width: 768px) {
  .hero h1 {
    font-size: var(--fs-2xl);
  }
  .hero-sub {
    font-size: var(--fs-md);
  }
  .card:hover {
    transform: translateY(-1px);
  }
}

/* ---- 底部联系方式 & 二维码 ---- */
.footer-contact {
  text-align: center;
  padding-bottom: var(--space-6);
  margin-bottom: var(--space-6);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.footer-contact h3 {
  font-size: var(--fs-lg);
  font-weight: 600;
  margin: 0 0 var(--space-1);
}
.footer-contact-sub {
  color: var(--color-fg-muted);
  margin: 0 0 var(--space-5);
  font-size: var(--fs-sm);
}
.footer-qr-grid {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  flex-wrap: wrap;
}
.footer-qr-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}
.footer-qr-card img {
  width: 160px;
  height: 160px;
  object-fit: contain;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.08);
  background: #fff;
  padding: 6px;
  transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}
.footer-qr-card img:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}
.footer-qr-label {
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-fg);
}
.footer-qr-hint {
  font-size: var(--fs-xs);
  color: var(--color-fg-muted);
  max-width: 160px;
  text-align: center;
  line-height: 1.4;
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

/* ---- 下载加速提示 ---- */
.dl-tip-slow {
  color: var(--color-fg-muted);
  font-size: var(--fs-xs);
  margin-top: var(--space-3);
}
.dl-tip-slow a {
  color: var(--color-accent);
  text-decoration: none;
}
.dl-tip-slow a:hover {
  text-decoration: underline;
}

/* ---- 偏好减少动画 ---- */
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  .card:hover,
  .btn-primary:hover,
  .btn-secondary:hover {
    transform: none;
  }
}