:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --bg: #f3f4f6;
    --card-bg: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --border: #e5e7eb;
    --success: #059669;
    --error: #dc2626;
    --radius: 10px;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.55;
}
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* --- Public header/footer --- */
.site-header { background: var(--card-bg); border-bottom: 1px solid var(--border); }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 16px 20px; }
.logo { font-size: 1.4rem; font-weight: 700; color: var(--primary); }
.main-nav a { margin-left: 20px; color: var(--text); font-weight: 500; }
.main-content { padding: 30px 20px 60px; min-height: 60vh; }
.site-footer { text-align: center; padding: 20px; color: var(--muted); font-size: 0.9rem; }

/* --- Alerts --- */
.alert { padding: 12px 16px; border-radius: var(--radius); margin-bottom: 16px; font-size: 0.95rem; }
.alert-success { background: #d1fae5; color: #065f46; }
.alert-error { background: #fee2e2; color: #991b1b; }

/* --- Hero / homepage --- */
.hero { text-align: center; padding: 40px 0 20px; }
.hero h1 { font-size: 2rem; margin-bottom: 8px; }
.hero p { color: var(--muted); margin-bottom: 24px; }
.shorten-form { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; max-width: 700px; margin: 0 auto; }
.shorten-form input { flex: 1 1 200px; padding: 12px 14px; border: 1px solid var(--border); border-radius: var(--radius); font-size: 1rem; }
.shorten-form button, .card button, .login-box button, form button {
    padding: 12px 22px; background: var(--primary); color: #fff; border: none; border-radius: var(--radius);
    font-size: 1rem; cursor: pointer; font-weight: 600;
}
.shorten-form button:hover, .card button:hover, .login-box button:hover { background: var(--primary-dark); }
.result-box { max-width: 500px; margin: 24px auto 0; background: var(--card-bg); padding: 16px; border-radius: var(--radius); border: 1px solid var(--border); }
.result-row { display: flex; gap: 8px; margin-top: 8px; }
.result-row input { flex: 1; padding: 10px; border-radius: var(--radius); border: 1px solid var(--border); }
.result-row button { padding: 10px 16px; }

.features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 50px; }
.feature { background: var(--card-bg); padding: 20px; border-radius: var(--radius); text-align: center; border: 1px solid var(--border); }
.feature h3 { margin-top: 0; }
@media (max-width: 800px) { .features { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 500px) { .features { grid-template-columns: 1fr; } }

/* --- Cards / tables (shared) --- */
.card { background: var(--card-bg); border-radius: var(--radius); border: 1px solid var(--border); padding: 20px; margin-bottom: 20px; }
.card h2 { margin-top: 0; font-size: 1.15rem; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 800px) { .grid-2 { grid-template-columns: 1fr; } }

.table-scroll {
    width: 100%;
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius);
}
.data-table { width: 100%; min-width: 560px; border-collapse: collapse; font-size: 0.92rem; }
.data-table th, .data-table td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--border); white-space: nowrap; }
.data-table th { color: var(--muted); font-weight: 600; }
.truncate { max-width: 320px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
@media (max-width: 600px) {
    .truncate { max-width: 160px; }
}
.actions a { margin-right: 10px; font-size: 0.88rem; }
.text-danger { color: var(--error); }

.badge { padding: 3px 10px; border-radius: 20px; font-size: 0.78rem; font-weight: 600; }
.badge-success { background: #d1fae5; color: #065f46; }
.badge-muted { background: #e5e7eb; color: #4b5563; }

.pagination { margin-top: 14px; display: flex; gap: 6px; flex-wrap: wrap; }
.pagination a { padding: 6px 12px; border: 1px solid var(--border); border-radius: 6px; color: var(--text); }
.pagination a.active { background: var(--primary); color: #fff; border-color: var(--primary); }

.inline-form { display: flex; flex-wrap: wrap; gap: 10px; }
.inline-form input { flex: 1 1 180px; padding: 10px 12px; border: 1px solid var(--border); border-radius: var(--radius); }
.btn-secondary { display: inline-flex; align-items: center; padding: 10px 16px; border: 1px solid var(--border); border-radius: var(--radius); color: var(--text); }

/* --- Login / setup --- */
.login-body { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: linear-gradient(135deg, var(--primary), #7c3aed); }
.login-box { background: var(--card-bg); padding: 40px; border-radius: 16px; width: 100%; max-width: 380px; box-shadow: 0 10px 40px rgba(0,0,0,0.15); }
.login-box h1 { margin: 0 0 4px; text-align: center; color: var(--primary); }
.login-box .subtitle { text-align: center; color: var(--muted); margin-bottom: 20px; }
.login-box label { display: block; font-size: 0.88rem; margin: 12px 0 4px; font-weight: 600; }
.login-box input { width: 100%; padding: 11px 12px; border: 1px solid var(--border); border-radius: var(--radius); font-size: 1rem; }
.login-box button { width: 100%; margin-top: 20px; }

/* --- Docs --- */
.docs pre { background: #111827; color: #e5e7eb; padding: 14px; border-radius: 8px; overflow-x: auto; font-size: 0.85rem; }
.docs code { background: #f3f4f6; padding: 2px 6px; border-radius: 4px; }

/* --- Admin panel --- */
.admin-body { background: var(--bg); }
.admin-wrap { display: flex; min-height: 100vh; }
.admin-sidebar { width: 220px; background: #111827; color: #f9fafb; flex-shrink: 0; padding: 20px 0; }
.admin-logo { font-size: 1.3rem; font-weight: 700; padding: 0 20px 20px; }
.admin-sidebar nav a { display: block; color: #d1d5db; padding: 12px 20px; font-weight: 500; }
.admin-sidebar nav a:hover, .admin-sidebar nav a.active { background: rgba(255,255,255,0.08); color: #fff; text-decoration: none; }
.admin-main { flex: 1; min-width: 0; }
.admin-topbar { background: var(--card-bg); border-bottom: 1px solid var(--border); padding: 16px 24px; font-weight: 600; display: flex; align-items: center; gap: 12px; }
.sidebar-toggle { display: none; background: none; border: none; font-size: 1.3rem; cursor: pointer; }
.admin-content { padding: 24px; }

.stat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-bottom: 24px; }
.stat-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; text-align: center; }
.stat-num { display: block; font-size: 2rem; font-weight: 700; color: var(--primary); }
.stat-label { color: var(--muted); font-size: 0.9rem; }
@media (max-width: 700px) { .stat-grid { grid-template-columns: 1fr; } }

@media (max-width: 900px) {
    .admin-sidebar { position: fixed; left: -220px; top: 0; bottom: 0; z-index: 100; transition: left 0.2s; }
    .admin-sidebar.open { left: 0; }
    .sidebar-toggle { display: inline-block; }
}