:root {
    --bg: #f7f9fc;
    --card: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --accent: #f97316;
    --danger: #dc2626;
    --success: #16a34a;
    --border: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans TC", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 20px;
}

.site-header {
    background: var(--card);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 10;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
}

.site-header nav a {
    margin-left: 18px;
    color: var(--text);
    text-decoration: none;
    font-size: 0.95rem;
}

.site-header nav a:hover { color: var(--primary); }

.hero {
    padding: 48px 0 24px;
    text-align: center;
}

.hero h1 {
    font-size: 2rem;
    margin-bottom: 12px;
}

.hero p {
    color: var(--muted);
    max-width: 600px;
    margin: 0 auto;
}

.deal-list {
    display: grid;
    gap: 20px;
    padding: 24px 0 48px;
}

.deal-card {
    background: var(--card);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow);
    border-left: 5px solid var(--border);
}

.deal-card.tier-paid { border-left-color: var(--accent); }
.deal-card.tier-free { border-left-color: var(--success); }

.deal-meta {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    background: var(--border);
    color: var(--text);
}

.badge.type-direct { background: #dbeafe; color: #1e40af; }
.badge.type-interline { background: #fef3c7; color: #92400e; }
.badge.type-error_fare { background: #fee2e2; color: #991b1b; }
.badge.tier { background: #f3e8ff; color: #6b21a8; }

.deal-card h2 {
    margin: 0 0 8px;
    font-size: 1.4rem;
}

.savings {
    font-size: 1.1rem;
    color: var(--success);
    font-weight: 700;
    margin: 0 0 8px;
}

.savings.big { font-size: 1.4rem; }

.why, .urgency {
    color: var(--muted);
    margin: 4px 0;
}

.urgency { color: var(--accent); font-weight: 600; }

.btn {
    display: inline-block;
    margin-top: 14px;
    padding: 10px 18px;
    border-radius: 8px;
    background: var(--primary);
    color: #fff;
    text-decoration: none;
    font-weight: 600;
    border: none;
    cursor: pointer;
}

.btn:hover { background: var(--primary-dark); }

.btn-primary { background: var(--primary); }

.paywall, .detail-panel, .auth-form, .pricing {
    background: var(--card);
    border-radius: 12px;
    padding: 28px;
    margin: 24px 0;
    box-shadow: var(--shadow);
}

.paywall h2, .detail-panel h2 { margin-top: 0; }

.cta { display: flex; gap: 12px; flex-wrap: wrap; }

.warn { color: var(--danger); font-weight: 700; }

.segments { padding-left: 20px; }
.segments li { margin-bottom: 8px; }

.affiliate-links { display: flex; gap: 12px; flex-wrap: wrap; }

.breadcrumbs { margin-bottom: 16px; }
.breadcrumbs a { color: var(--muted); text-decoration: none; }

.auth-form { max-width: 420px; margin: 48px auto; }
.auth-form h1 { margin-top: 0; }
.auth-form label { display: block; margin-bottom: 14px; }
.auth-form input {
    width: 100%;
    padding: 10px;
    margin-top: 6px;
    border: 1px solid var(--border);
    border-radius: 6px;
}
.actions { display: flex; gap: 12px; }
.error { color: var(--danger); font-weight: 600; }

.plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; margin-top: 20px; }
.plan { border: 1px solid var(--border); border-radius: 10px; padding: 20px; text-align: center; }
.plan .price { font-size: 1.6rem; font-weight: 800; color: var(--primary); }
.plan ul { text-align: left; margin: 16px 0; padding-left: 20px; }
.hint { color: var(--muted); margin-top: 24px; }

.stats { display: flex; gap: 20px; margin: 20px 0; }
.stat {
    background: var(--card);
    border-radius: 10px;
    padding: 20px 28px;
    box-shadow: var(--shadow);
    text-align: center;
    flex: 1;
}
.stat span { display: block; font-size: 2rem; font-weight: 800; color: var(--primary); }

.admin-nav { margin: 20px 0; }
.admin-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
}
.admin-table th, .admin-table td { padding: 12px 14px; border-bottom: 1px solid var(--border); text-align: left; }
.admin-table th { background: #f3f4f6; font-weight: 700; }

.site-footer {
    text-align: center;
    padding: 32px 0;
    color: var(--muted);
    font-size: 0.9rem;
}

.empty { text-align: center; color: var(--muted); padding: 48px 0; }