/* AIPilot Site CSS - Clean UI Design System */
/* 遵循 clean-ui-designer 规范 */

:root {
  --bg: #f8f9fa;
  --card-bg: #ffffff;
  --card-border: #e8e8e8;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --accent: #16a34a;
  --accent-hover: #15803d;
  --text: #1a1a2e;
  --text-body: #333333;
  --text-muted: #666666;
  --text-light: #888888;
  --border: #e0e0e0;
  --shadow: 0 1px 3px rgba(0,0,0,.06);
  --shadow-hover: 0 4px 12px rgba(0,0,0,.1);
  --radius: 8px;
  --radius-sm: 6px;
  --font: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --max-width: 1100px;
  --max-content: 800px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-body);
  min-height: 100vh;
  line-height: 1.6;
}

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.container-narrow { max-width: var(--max-content); margin: 0 auto; padding: 0 24px; }

/* Navigation */
nav {
  display: flex; justify-content: space-between; align-items: center;
  padding: 20px 0; border-bottom: 1px solid var(--border);
  flex-wrap: wrap; gap: 12px;
}
.logo {
  font-size: 22px; font-weight: 700; text-decoration: none;
  color: var(--primary);
}
.nav-links { display: flex; gap: 24px; flex-wrap: wrap; align-items: center; }
.nav-links a { color: var(--text-muted); text-decoration: none; font-size: 14px; font-weight: 500; transition: color 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }

/* Language Switcher */
.lang-switch { display: flex; gap: 4px; margin-left: 12px; }
.lang-switch button {
  background: transparent; border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 4px 10px; font-size: 12px; cursor: pointer; color: var(--text-muted);
  font-family: var(--font); transition: all 0.2s;
}
.lang-switch button.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.lang-switch button:hover:not(.active) { border-color: var(--primary); color: var(--primary); }

/* Header */
.page-header { text-align: center; padding: 48px 0 32px; }
.page-header h1 { font-size: 36px; font-weight: 700; color: var(--text); margin-bottom: 8px; }
.page-header .subtitle { color: var(--text-muted); font-size: 16px; }

/* Buttons */
.btn {
  display: inline-block; padding: 12px 28px; border-radius: var(--radius-sm);
  font-size: 15px; font-weight: 600; text-decoration: none; cursor: pointer;
  transition: all 0.2s; border: none; font-family: var(--font);
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: var(--accent-hover); }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text-body); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-lg { padding: 16px 36px; font-size: 16px; }
.btn-block { display: block; width: 100%; text-align: center; }

.btn-group { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* Cards */
.card {
  background: var(--card-bg); border: 1px solid var(--card-border);
  border-radius: var(--radius); padding: 24px;
  box-shadow: var(--shadow); transition: all 0.2s;
}
.card:hover { box-shadow: var(--shadow-hover); }
.card h3 { font-size: 18px; font-weight: 700; color: var(--text); margin-bottom: 8px; }
.card p { color: var(--text-muted); font-size: 14px; line-height: 1.7; }

/* Product Card (通用) */
.product-card {
  background: var(--card-bg); border: 1px solid var(--card-border);
  border-radius: var(--radius); padding: 24px;
  box-shadow: var(--shadow); transition: all 0.2s;
  display: flex; flex-direction: column;
}
.product-card:hover { border-color: var(--primary); box-shadow: var(--shadow-hover); }
.product-card .price { font-size: 28px; font-weight: 700; color: var(--accent); }
.product-card .price-original { text-decoration: line-through; color: var(--text-light); font-size: 14px; }
.product-card .desc { color: var(--text-muted); font-size: 14px; flex-grow: 1; }

/* Product Section Row (products.html) */
.product-row {
  background: var(--card-bg); border: 1px solid var(--card-border);
  border-radius: var(--radius); padding: 28px 32px; margin-bottom: 20px;
  display: grid; grid-template-columns: 1fr 260px; gap: 32px; align-items: center;
  box-shadow: var(--shadow); transition: all 0.2s;
}
.product-row:hover { box-shadow: var(--shadow-hover); }
.product-row.featured { border-left: 4px solid var(--primary); }
.product-row h2 { font-size: 22px; font-weight: 700; color: var(--text); margin-bottom: 6px; }
.product-row .desc { color: var(--text-muted); font-size: 14px; line-height: 1.7; margin-bottom: 12px; }
.product-row .features-list { list-style: none; columns: 2; }
.product-row .features-list li { color: var(--text-muted); font-size: 13px; padding: 3px 0; }
.product-row .features-list li::before { content: '\2713'; color: var(--accent); margin-right: 8px; font-weight: 700; }
.product-row .price { font-size: 32px; font-weight: 700; color: var(--accent); }
.product-row .price-period { color: var(--text-muted); font-size: 13px; margin-bottom: 16px; }

.badge-new {
  display: inline-block; background: var(--accent); color: #fff;
  font-size: 12px; font-weight: 600; padding: 3px 12px; border-radius: 20px;
  margin-bottom: 10px;
}

/* Forms */
.form-group { margin-bottom: 16px; }
.form-group label {
  display: block; font-size: 13px; color: var(--text-muted);
  margin-bottom: 5px; font-weight: 600;
}
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 10px 14px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--card-bg);
  color: var(--text-body); font-size: 14px; font-family: var(--font);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}
.form-group textarea { min-height: 80px; resize: vertical; }

/* Grid helpers */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }

/* Panels (for product tools) */
.panel {
  background: var(--card-bg); border: 1px solid var(--card-border);
  border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow);
}
.panel h3 { font-size: 15px; font-weight: 700; color: var(--primary); margin-bottom: 16px; }
.panel.full { grid-column: 1 / -1; }

/* Metrics */
.metric-card {
  background: var(--bg); border: 1px solid var(--card-border);
  border-radius: var(--radius); padding: 16px; text-align: center;
}
.metric-card .metric-value { font-size: 28px; font-weight: 700; color: var(--primary); }
.metric-card .metric-label { font-size: 11px; color: var(--text-muted); margin-top: 4px; }

/* Tags */
.tag {
  display: inline-block; padding: 3px 10px; border-radius: var(--radius-sm);
  font-size: 11px; background: rgba(37,99,235,.08); color: var(--primary);
  border: 1px solid rgba(37,99,235,.2); margin: 2px;
}

/* Sections */
.section { padding: 48px 0; }
.section-title { font-size: 28px; font-weight: 700; color: var(--text); text-align: center; margin-bottom: 8px; }
.section-sub { text-align: center; color: var(--text-muted); font-size: 16px; margin-bottom: 40px; }

/* CTA Section */
.cta-box {
  background: var(--card-bg); border: 1px solid var(--card-border);
  border-radius: var(--radius); padding: 40px; text-align: center;
  max-width: 600px; margin: 0 auto; box-shadow: var(--shadow);
}
.cta-box h3 { font-size: 22px; font-weight: 700; color: var(--text); margin-bottom: 8px; }
.cta-box p { color: var(--text-muted); font-size: 14px; margin-bottom: 20px; }

/* Footer */
footer {
  border-top: 1px solid var(--border); padding: 32px 0; margin-top: 48px;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px;
}
footer span { color: var(--text-light); font-size: 13px; }
footer a { color: var(--text-muted); text-decoration: none; font-size: 13px; }
footer a:hover { color: var(--primary); }

/* Utility */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }

/* Code / pre blocks */
pre.code-block {
  background: #f1f5f9; border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 16px; overflow-x: auto;
  font-family: "Consolas", "Menlo", monospace; font-size: 12px;
  color: var(--text-body); line-height: 1.6;
}

/* Responsive */
@media (max-width: 768px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .grid-auto { grid-template-columns: 1fr; }
  .product-row { grid-template-columns: 1fr; }
  .product-row .features-list { columns: 1; }
  nav { flex-direction: column; align-items: flex-start; }
  .nav-links { flex-direction: column; gap: 12px; width: 100%; }
  .lang-switch { margin-left: 0; }
  .page-header h1 { font-size: 28px; }
}