/* ── 基础 ── */
:root {
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --success: #059669;
  --danger: #dc2626;
  --bg: #f8fafc;
  --card: #fff;
  --border: #e2e8f0;
  --text: #1e293b;
  --text-muted: #64748b;
  --radius: 12px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ── 导航 ── */
nav {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

nav .logo { font-size: 20px; font-weight: 700; color: var(--primary); text-decoration: none; }
nav .nav-links { display: flex; gap: 16px; align-items: center; }
nav .nav-links a { text-decoration: none; color: var(--text); font-weight: 500; font-size: 14px; }
nav .nav-links a:hover { color: var(--primary); }

.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 20px; border-radius: 8px; border: none;
  font-size: 14px; font-weight: 600; cursor: pointer;
  text-decoration: none; transition: all .15s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-outline { background: transparent; border: 2px solid var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* ── 卡片 ── */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 1px 3px rgba(0,0,0,.04);
}

/* ── 表单 ── */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; color: var(--text); }
.form-group input, .form-group select {
  width: 100%; padding: 10px 14px;
  border: 2px solid var(--border); border-radius: 8px;
  font-size: 15px; transition: border-color .15s;
}
.form-group input:focus, .form-group select:focus {
  outline: none; border-color: var(--primary);
}

/* ── 提示 ── */
.alert {
  padding: 12px 16px; border-radius: 8px; font-size: 14px; margin-bottom: 16px;
}
.alert-error { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; }
.alert-success { background: #f0fdf4; color: var(--success); border: 1px solid #bbf7d0; }

/* ── 表格 ── */
table { width: 100%; border-collapse: collapse; }
th, td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--border); font-size: 14px; }
th { font-weight: 600; color: var(--text-muted); font-size: 13px; text-transform: uppercase; letter-spacing: .5px; }

.badge {
  display: inline-block; padding: 2px 10px; border-radius: 20px;
  font-size: 12px; font-weight: 600;
}
.badge-free { background: #f1f5f9; color: #475569; }
.badge-pro { background: #ede9fe; color: #7c3aed; }
.badge-team { background: #dbeafe; color: #2563eb; }
.badge-biz { background: #fef3c7; color: #b45309; }

/* ── 用量条 ── */
.usage-bar {
  background: var(--border); height: 8px; border-radius: 4px; margin-top: 8px; overflow: hidden;
}
.usage-bar-fill {
  height: 100%; border-radius: 4px; background: var(--primary); transition: width .3s;
}
.usage-bar-fill.warn { background: #f59e0b; }
.usage-bar-fill.danger { background: var(--danger); }

/* ── 空状态 ── */
.empty {
  text-align: center; padding: 48px 24px; color: var(--text-muted);
}
.empty h3 { margin-bottom: 8px; color: var(--text); }

/* ── Grid ── */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: 1fr 1fr; }
.grid-3 { grid-template-columns: 1fr 1fr 1fr; }
.grid-4 { grid-template-columns: 1fr 1fr 1fr 1fr; }

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* ── 页面容器 ── */
.container { max-width: 1100px; margin: 0 auto; padding: 32px 24px; }
.auth-container { max-width: 420px; margin: 60px auto; padding: 0 24px; }
.auth-container h1 { text-align: center; margin-bottom: 24px; font-size: 24px; }

.page-title { font-size: 24px; font-weight: 700; margin-bottom: 24px; }

/* ── 弹窗 ── */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.4);
  display: flex; align-items: center; justify-content: center; z-index: 100;
}
.modal {
  background: var(--card); border-radius: var(--radius);
  padding: 32px; max-width: 480px; width: 90%; max-height: 80vh; overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,.15);
}
.modal h2 { margin-bottom: 20px; }

/* ── Landing ── */
.hero { text-align: center; padding: 80px 24px 48px; }
.hero h1 { font-size: 42px; font-weight: 800; margin-bottom: 16px; letter-spacing: -.5px; }
.hero p { font-size: 18px; color: var(--text-muted); max-width: 600px; margin: 0 auto 32px; }
.pricing { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; max-width: 960px; margin: 0 auto; padding: 0 24px; }
@media (max-width: 768px) { .pricing { grid-template-columns: 1fr; } }
.pricing-card {
  background: var(--card); border: 2px solid var(--border); border-radius: var(--radius);
  padding: 28px; text-align: center;
}
.pricing-card.featured { border-color: var(--primary); box-shadow: 0 4px 20px rgba(79,70,229,.15); }
.pricing-card h3 { font-size: 20px; margin-bottom: 8px; }
.pricing-card .price { font-size: 32px; font-weight: 800; margin: 12px 0; }
.pricing-card .price span { font-size: 14px; font-weight: 400; color: var(--text-muted); }
.pricing-card ul { list-style: none; margin: 20px 0; font-size: 14px; color: var(--text-muted); }
.pricing-card ul li { padding: 4px 0; }

/* ── Dashboard ── */
.short-url { display: flex; align-items: center; justify-content: space-between; padding: 12px 0; }
.short-url + .short-url { border-top: 1px solid var(--border); }
.short-url .url-info { flex: 1; min-width: 0; }
.short-url .long-url { font-size: 13px; color: var(--text-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.short-url .short-url-link { color: var(--primary); font-weight: 600; font-size: 15px; }
.short-url .meta { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

/* ── 统计卡片 ── */
.stat-card { text-align: center; }
.stat-card .stat-num { font-size: 36px; font-weight: 800; }
.stat-card .stat-label { font-size: 14px; color: var(--text-muted); }

/* ── 快捷创建 ── */
.create-bar { display: flex; gap: 12px; margin-bottom: 24px; }
.create-bar input { flex: 1; }

/* ── 页面头部 ── */
.page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; }