:root {
    --primary: #2f6fed;
    --primary-dark: #1f4fc4;
    --bg: #f4f6fb;
    --card: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --border: #e5e7eb;
    --success: #16a34a;
    --danger: #dc2626;
    --warning: #d97706;
    --radius: 14px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: "Segoe UI", Roboto, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

a { color: var(--primary); text-decoration: none; }

.navbar {
    background: var(--card);
    border-bottom: 1px solid var(--border);
    padding: 14px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 50;
}

.navbar .brand {
    font-weight: 700;
    font-size: 20px;
    color: var(--primary);
}

.navbar nav {
    display: flex;
    gap: 18px;
    align-items: center;
    flex-wrap: wrap;
}

.navbar nav a {
    color: var(--text);
    font-weight: 500;
    font-size: 14px;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 28px 20px;
}

.card {
    background: var(--card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    padding: 24px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.card + .card { margin-top: 20px; }

h1, h2, h3 { margin-top: 0; }

.grid {
    display: grid;
    gap: 20px;
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

.form-group { margin-bottom: 16px; }

label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    font-size: 14px;
}

input, select, textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    background: #fff;
    color: var(--text);
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(47,111,237,0.15);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: 8px;
    border: none;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    background: var(--primary);
    color: #fff;
    transition: background 0.15s ease;
}

.btn:hover { background: var(--primary-dark); }
.btn.secondary { background: #eef2ff; color: var(--primary); }
.btn.danger { background: #fee2e2; color: var(--danger); }
.btn.success { background: #dcfce7; color: var(--success); }
.btn.small { padding: 6px 12px; font-size: 13px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
}

.badge.confirmed { background: #dcfce7; color: var(--success); }
.badge.cancelled { background: #fee2e2; color: var(--danger); }
.badge.pending { background: #fef3c7; color: var(--warning); }

.slots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
    gap: 10px;
    margin-top: 16px;
}

.slot-btn {
    padding: 10px 6px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #fff;
    cursor: pointer;
    font-size: 13px;
    text-align: center;
    font-weight: 600;
}

.slot-btn:hover { border-color: var(--primary); color: var(--primary); }
.slot-btn.selected { background: var(--primary); color: #fff; border-color: var(--primary); }

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

th, td {
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th { color: var(--muted); font-weight: 600; font-size: 13px; text-transform: uppercase; }

.alert {
    padding: 12px 16px;
    border-radius: 10px;
    margin-bottom: 16px;
    font-size: 14px;
}

.alert.success { background: #dcfce7; color: #166534; }
.alert.error { background: #fee2e2; color: #991b1b; }
.alert.info { background: #dbeafe; color: #1e40af; }

.steps {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.step {
    padding: 6px 14px;
    border-radius: 999px;
    background: #eef2ff;
    color: var(--primary);
    font-size: 13px;
    font-weight: 600;
}

.step.active { background: var(--primary); color: #fff; }

.admin-layout { display: flex; min-height: 100vh; }

.admin-sidebar {
    width: 230px;
    background: #111827;
    color: #fff;
    padding: 20px 0;
    flex-shrink: 0;
}

.admin-sidebar .brand { padding: 0 20px 20px; font-weight: 700; font-size: 18px; }

.admin-sidebar a {
    display: block;
    padding: 10px 20px;
    color: #cbd5e1;
    font-size: 14px;
    font-weight: 500;
}

.admin-sidebar a:hover, .admin-sidebar a.active { background: #1f2937; color: #fff; }

.admin-content { flex: 1; padding: 28px; max-width: 1200px; }

.top-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 16px; margin-bottom: 20px; }

.stat-card { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 18px; }
.stat-card .value { font-size: 26px; font-weight: 700; color: var(--primary); }
.stat-card .label { font-size: 13px; color: var(--muted); margin-top: 4px; }

.flex-between { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(17, 24, 39, 0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 16px;
}

.modal {
    background: var(--card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    padding: 24px;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.18);
}

.modal h3 { margin-top: 0; }

.resend-channels {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 12px;
}

.resend-channels label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 500;
}

.resend-channels input[type="checkbox"] { width: auto; }

@media (max-width: 768px) {
    .admin-layout { flex-direction: column; }
    .admin-sidebar { width: 100%; padding: 10px 0; }
    .admin-sidebar nav { display: flex; overflow-x: auto; }
    .admin-sidebar .brand { display: none; }
    .admin-content { padding: 16px; }
    .navbar { flex-direction: column; align-items: flex-start; gap: 10px; }
}