/* AnyCode 产品介绍站 — 深色开发者工具风格，无外部依赖 */
:root {
  --bg: #0b0f14;
  --surface: #11161d;
  --border: #1f2937;
  --text: #e6edf3;
  --muted: #8b98a5;
  --accent: #38bdf8;
  --accent-2: #818cf8;
  --radius: 12px;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
code { font-family: var(--mono); font-size: 0.9em; background: var(--surface); border: 1px solid var(--border); border-radius: 6px; padding: 0.1em 0.4em; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Hero */
.hero {
  padding: 96px 0 72px;
  text-align: center;
  background:
    radial-gradient(ellipse 60% 50% at 50% -10%, rgba(56, 189, 248, .14), transparent),
    radial-gradient(ellipse 40% 40% at 80% 10%, rgba(129, 140, 248, .10), transparent);
}
.badge {
  display: inline-block;
  font-size: 13px;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 14px;
  background: var(--surface);
}
.hero h1 {
  font-size: clamp(34px, 6vw, 56px);
  line-height: 1.2;
  margin: 24px 0 16px;
  background: linear-gradient(120deg, var(--text) 60%, var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub { max-width: 640px; margin: 0 auto; color: var(--muted); font-size: 18px; }
.cta-row { margin-top: 36px; display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  font: inherit;
  font-weight: 600;
  border-radius: 10px;
  padding: 12px 28px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary {
  color: #06121c;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  box-shadow: 0 6px 24px rgba(56, 189, 248, .25);
}
.btn-ghost { color: var(--text); background: var(--surface); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--accent); }

/* 区块标题 */
.section-title { font-size: 30px; text-align: center; margin: 0 0 40px; }

/* 特性卡片 */
.features { padding: 72px 0; }
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  transition: border-color .15s ease, transform .15s ease;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card h3 { margin: 12px 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card-icon { font-size: 26px; }

/* 安装 */
.install { padding: 72px 0 96px; }
.install-sub { max-width: 720px; margin: -20px auto 40px; text-align: center; color: var(--muted); }
.tabs { max-width: 760px; margin: 0 auto; }
.tab-input { position: absolute; opacity: 0; pointer-events: none; }
.tab-label {
  display: inline-block;
  padding: 8px 20px;
  color: var(--muted);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: 10px 10px 0 0;
  background: var(--bg);
  cursor: pointer;
}
.tab-input:checked + .tab-label { color: var(--text); background: var(--surface); border-color: var(--accent); }
.tab-panel-1, .tab-panel-2 {
  display: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0 var(--radius) var(--radius) var(--radius);
  padding: 20px 24px 24px;
}
#tab-web:checked ~ .tab-panel-1 { display: block; }
#tab-cli:checked ~ .tab-panel-2 { display: block; }

/* 命令行 + 复制按钮 */
.cmd {
  position: relative;
  margin: 12px 0 0;
  padding: 16px 96px 16px 18px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow-x: auto;
}
.cmd code { background: none; border: none; padding: 0; color: #a5e3ff; font-size: 14px; white-space: pre; }
.copy-btn {
  position: absolute;
  top: 50%;
  right: 12px;
  transform: translateY(-50%);
  font: inherit;
  font-size: 13px;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 14px;
  cursor: pointer;
}
.copy-btn:hover { color: var(--text); border-color: var(--accent); }
.copy-btn.copied { color: #34d399; border-color: #34d399; }
/* Hero 里的复制按钮不在 .cmd 内，取消绝对定位并恢复与 .btn 对等的尺寸（终审批准的计划外修正） */
.cta-row .copy-btn {
  position: static;
  transform: none;
  font-size: inherit;
  padding: 12px 28px;
  border-radius: 10px;
}

/* 页脚 */
.footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  color: var(--muted);
  font-size: 14px;
  text-align: center;
}

/* 滚动显现：仅在 JS 就绪（html.reveal-init）时才初始隐藏，无 JS 全可见 */
html.reveal-init .reveal { opacity: 0; transform: translateY(16px); transition: opacity .5s ease, transform .5s ease; }
html.reveal-init .reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html.reveal-init .reveal { transition: none; transform: none; }
  .btn:hover, .card:hover { transform: none; }
}

/* 响应式 */
@media (max-width: 640px) {
  .hero { padding: 64px 0 48px; }
  .hero-sub { font-size: 16px; }
  .features, .install { padding: 48px 0 64px; }
  .tab-label { padding: 8px 12px; font-size: 14px; }
}