/* ==================== AI 智算平台 - 全局样式 ==================== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: #eef2ff;
  --primary-glow: rgba(99,102,241,0.3);
  --accent: #06b6d4;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.1);
  --transition: all 0.25s cubic-bezier(0.4,0,0.2,1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; width: 100%; }

/* ==================== 导航栏 ==================== */
.navbar {
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(226,232,240,0.6);
  padding: 14px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar .container { display: flex; align-items: center; justify-content: space-between; }

.logo {
  font-size: 20px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
  letter-spacing: -0.5px;
}

.nav-links { display: flex; align-items: center; gap: 14px; }
.nav-links a { text-decoration: none; color: var(--text-muted); font-size: 14px; font-weight: 500; transition: var(--transition); }
.nav-links a:hover { color: var(--primary); }
.nav-user { font-weight: 600; color: var(--text); font-size: 14px; }

/* ==================== 按钮 ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 22px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  letter-spacing: 0.2px;
}

.btn-primary { background: linear-gradient(135deg, var(--primary), #7c3aed); color: #fff; box-shadow: 0 2px 8px var(--primary-glow); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px var(--primary-glow); }

.btn-outline { background: transparent; color: var(--primary); border: 1.5px solid var(--primary); }
.btn-outline:hover { background: var(--primary-light); }

.btn-block { width: 100%; }
.btn-sm { padding: 6px 16px; font-size: 13px; border-radius: 8px; cursor: pointer; background: var(--primary-light); color: var(--primary); border: none; font-weight: 600; transition: var(--transition); }
.btn-sm:hover { background: #dde3ff; }

/* ==================== 首页 Hero ==================== */
.hero { padding: 80px 0 60px; text-align: center; flex: 1; }

.hero-badge {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  padding: 6px 18px;
  border-radius: 50px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero h1 { font-size: 52px; font-weight: 850; background: linear-gradient(135deg, var(--primary) 0%, #7c3aed 50%, var(--accent) 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; margin-bottom: 16px; letter-spacing: -1px; }
.hero .subtitle { font-size: 18px; color: var(--text-muted); margin-bottom: 56px; max-width: 500px; margin-left: auto; margin-right: auto; }

.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; margin-bottom: 56px; }

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: left;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.feature-card:hover::before { opacity: 1; }

.feature-card .icon {
  font-size: 32px;
  margin-bottom: 12px;
}

.feature-card h3 { font-size: 18px; margin-bottom: 8px; color: var(--text); }
.feature-card p { font-size: 14px; color: var(--text-muted); line-height: 1.7; }

/* ==================== 订阅套餐卡片（首页） ==================== */
.pricing-section { text-align: center; margin-bottom: 60px; }
.pricing-section h2 { font-size: 32px; font-weight: 800; margin-bottom: 12px; }
.pricing-section > p { color: var(--text-muted); margin-bottom: 40px; }

.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; max-width: 960px; margin: 0 auto; }

.pricing-card {
  background: var(--card-bg);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  text-align: center;
}

.pricing-card:hover { border-color: var(--primary); box-shadow: var(--shadow-md); transform: translateY(-3px); }
.pricing-card.selected { border-color: var(--primary); background: var(--primary-light); }

.pricing-card .plan-name { font-size: 16px; font-weight: 700; margin-bottom: 4px; }
.pricing-card .plan-price { font-size: 36px; font-weight: 850; color: var(--primary); margin: 8px 0 2px; }
.pricing-card .plan-price span { font-size: 16px; font-weight: 500; }
.pricing-card .plan-desc { font-size: 13px; color: var(--success); font-weight: 600; margin-bottom: 4px; }
.pricing-card .plan-meta { font-size: 12px; color: var(--text-muted); }

.pricing-card.recommended { border-color: #7c3aed; }
.pricing-card.recommended .badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  color: #fff;
  padding: 3px 16px;
  border-radius: 50px;
  font-size: 11px;
  font-weight: 700;
  white-space: nowrap;
}

/* ==================== 认证页面 ==================== */
.auth-page { flex: 1; display: flex; align-items: center; justify-content: center; padding: 40px 24px; }

.auth-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 44px 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-md);
}

.auth-card h2 { font-size: 26px; font-weight: 800; text-align: center; margin-bottom: 6px; }
.auth-card .auth-subtitle { text-align: center; color: var(--text-muted); font-size: 14px; margin-bottom: 28px; }

.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; color: var(--text-muted); margin-bottom: 6px; }
.form-group input {
  width: 100%;
  padding: 11px 14px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  font-size: 14px;
  transition: var(--transition);
  outline: none;
  background: var(--bg);
}
.form-group input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(99,102,241,0.1); }

.auth-link { text-align: center; margin-top: 22px; font-size: 14px; color: var(--text-muted); }
.auth-link a { color: var(--primary); text-decoration: none; font-weight: 600; }

.optional { font-weight: 400; color: var(--text-muted); font-size: 12px; }

/* ==================== 消息提示 ==================== */
.error-message { background: #fef2f2; color: var(--danger); padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; font-size: 13px; border: 1px solid #fecaca; }
.success-message { background: #f0fdf4; color: var(--success); padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; font-size: 13px; border: 1px solid #bbf7d0; }
.info-box { background: var(--primary-light); padding: 18px; border-radius: var(--radius-sm); }

/* ==================== 仪表盘 ==================== */
.dashboard { padding: 36px 0; flex: 1; }

.overview-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; margin-bottom: 32px; }

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.card:hover { box-shadow: var(--shadow-md); }

.card h3 { font-size: 12px; text-transform: uppercase; color: var(--text-muted); letter-spacing: 1px; margin-bottom: 8px; font-weight: 600; }
.card-value { font-size: 28px; font-weight: 800; color: var(--text); }
.card-value.apikey { font-size: 16px; font-family: 'SF Mono', 'Fira Code', monospace; word-break: break-all; color: var(--text-muted); }
.card-value.subscription { color: var(--success); }
.card-value.expired { color: var(--danger); }

/* ==================== 标签页 ==================== */
.tabs { display: flex; gap: 4px; border-bottom: 2px solid var(--border); margin-bottom: 28px; overflow-x: auto; scrollbar-width: none; -ms-overflow-style: none; }
.tabs::-webkit-scrollbar { display: none; }

.tab-btn {
  padding: 11px 24px;
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  white-space: nowrap;
  transition: var(--transition);
  border-radius: 8px 8px 0 0;
}

.tab-btn:hover { color: var(--primary); background: var(--primary-light); }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); }

.tab-content { display: none; }
.tab-content.active { display: block; }

.content-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
}

.content-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 6px; }
.content-card h4 { font-size: 16px; margin: 24px 0 10px; color: var(--text); }

.text-muted { color: var(--text-muted); font-size: 14px; }

/* ==================== 订阅购买面板 ==================== */
.subscribe-plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 14px; margin: 18px 0; }

/* ==================== 表格 ==================== */
.data-table { width: 100%; border-collapse: collapse; font-size: 14px; margin-top: 12px; }

.data-table th {
  text-align: left;
  padding: 12px 16px;
  background: var(--bg);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 2px solid var(--border);
}

.data-table td { padding: 12px 16px; border-bottom: 1px solid var(--border); }

.status-pending { color: var(--warning); font-weight: 600; }
.status-paid { color: var(--success); font-weight: 600; }
.status-cancelled { color: var(--text-muted); }

/* ==================== Toast ==================== */
.toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: #1e293b;
  color: #fff;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 14px;
  font-weight: 600;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s, transform 0.3s;
  z-index: 999;
  box-shadow: 0 8px 24px rgba(0,0,0,0.2);
}

.toast.show { opacity: 1; transform: translateX(-50%) translateY(4px); }
.toast.error { background: var(--danger); }

/* ==================== 表单卡片 ==================== */
.form-card { max-width: 480px; }

/* ==================== 页脚 ==================== */
footer {
  background: var(--card-bg);
  border-top: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
  margin-top: auto;
}

/* ==================== 响应式 ==================== */
@media (max-width: 768px) {
  .hero h1 { font-size: 34px; }
  .overview-cards { grid-template-columns: 1fr 1fr; }
  .pricing-grid { grid-template-columns: 1fr 1fr; }
  .subscribe-plans { grid-template-columns: 1fr 1fr; }
  .card-value { font-size: 22px; }
  .tabs { gap: 0; }
  .tab-btn { padding: 8px 16px; font-size: 13px; }
  .content-card { padding: 22px; }
}

@media (max-width: 480px) {
  .pricing-grid { grid-template-columns: 1fr; }
  .subscribe-plans { grid-template-columns: 1fr; }
}