:root {
    --bg-dark: #0e1118;
    --card-bg: #161b26;
    --card-border: #252b3b;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --accent: #ef4444;
    --success: #10b981;
    --warning: #f59e0b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
}

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

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

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

.admin-sidebar {
    width: 250px;
    background: #111420;
    border-right: 1px solid var(--card-border);
    display: flex;
    flex-direction: column;
}

.sidebar-brand {
    padding: 24px 20px;
    border-bottom: 1px solid var(--card-border);
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-brand h2 {
    font-size: 18px;
    font-weight: 800;
    color: #fff;
}

.brand-tag {
    background: rgba(239, 68, 68, 0.2);
    color: var(--accent);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 10px;
    font-weight: 800;
}

.admin-nav {
    padding: 20px 0;
    flex: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.nav-item:hover, .nav-item.active {
    color: #fff;
    background: #191e2e;
    border-left-color: var(--primary);
}

.nav-item.active {
    color: var(--primary);
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--card-border);
}

.btn-logout {
    display: block;
    width: 100%;
    text-align: center;
    padding: 10px;
    background: #1c2233;
    border: 1px solid var(--card-border);
    border-radius: 6px;
    color: #fca5a5;
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    transition: background 0.2s;
}

.btn-logout:hover {
    background: rgba(239, 68, 68, 0.2);
}

/* Main Content Area */
.admin-main {
    flex: 1;
    padding: 30px 40px;
    overflow-y: auto;
}

.page-header {
    margin-bottom: 28px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.page-title {
    font-size: 24px;
    font-weight: 800;
    color: #fff;
    margin-bottom: 4px;
}

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

/* Cards & Grid */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 20px;
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 28px;
    font-weight: 800;
    color: #fff;
}

.content-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 28px;
}

.card-title {
    font-size: 17px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 18px;
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Forms */
.form-group {
    margin-bottom: 18px;
}

label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 8px;
}

input[type="text"], input[type="password"], input[type="number"], select, textarea {
    width: 100%;
    background: #0d1017;
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 10px 14px;
    color: #fff;
    font-size: 14px;
    transition: border-color 0.2s;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.form-grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    text-decoration: none;
    transition: opacity 0.2s;
}

.btn:hover { opacity: 0.9; }

.btn-primary { background: var(--primary); color: #fff; }
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--accent); color: #fff; }
.btn-secondary { background: #22293a; color: #fff; border: 1px solid var(--card-border); }

/* Tables */
.admin-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

.admin-table th {
    text-align: left;
    padding: 12px 14px;
    color: var(--text-muted);
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    border-bottom: 1px solid var(--card-border);
}

.admin-table td {
    padding: 14px;
    border-bottom: 1px solid #1a2030;
    font-size: 14px;
    vertical-align: middle;
}

.video-thumb-sm {
    width: 60px;
    height: 36px;
    object-fit: cover;
    border-radius: 4px;
}

.badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 700;
}

.badge-success { background: rgba(16, 185, 129, 0.15); color: #6ee7b7; }
.badge-muted { background: rgba(148, 163, 184, 0.15); color: #94a3b8; }

.actions-cell {
    display: flex;
    gap: 8px;
}

.btn-icon {
    background: #1c2233;
    border: 1px solid var(--card-border);
    color: #fff;
    padding: 6px 10px;
    border-radius: 6px;
    font-size: 12px;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.2s;
}

.btn-icon:hover { background: #28314a; }
.btn-icon.del:hover { background: var(--accent); }

/* Alerts */
.admin-alert {
    padding: 14px 18px;
    border-radius: 8px;
    margin-bottom: 22px;
    font-size: 14px;
}

.alert-success { background: rgba(16, 185, 129, 0.15); border: 1px solid rgba(16, 185, 129, 0.3); color: #6ee7b7; }
.alert-error { background: rgba(239, 68, 68, 0.15); border: 1px solid rgba(239, 68, 68, 0.3); color: #fca5a5; }

/* Code preview */
.code-box {
    background: #090b10;
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 16px;
    font-family: monospace;
    font-size: 13px;
    color: #93c5fd;
    white-space: pre-wrap;
    word-break: break-all;
    user-select: all;
    margin-bottom: 12px;
}