:root {
    --sidebar-width: 270px;
    --topbar-height: 64px;
    --primary: #4f46e5;
    --primary-light: #6366f1;
    --primary-dark: #4338ca;
    --primary-50: #eef2ff;
    --sidebar-bg: #0f172a;
    --sidebar-hover: #1e293b;
    --sidebar-active: rgba(99,102,241,0.15);
    --surface: #ffffff;
    --surface-2: #f8fafc;
    --border: #e2e8f0;
    --text: #0f172a;
    --text-secondary: #64748b;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -2px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.06);
    --transition: all 0.2s cubic-bezier(0.4,0,0.2,1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #f1f5f9;
    min-height: 100vh;
    color: var(--text);
    -webkit-font-smoothing: antialiased;
}

/* ===== SIDEBAR ===== */
.sidebar {
    width: var(--sidebar-width);
    min-height: 100vh;
    background: var(--sidebar-bg);
    position: fixed;
    left: 0;
    top: 0;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s cubic-bezier(0.4,0,0.2,1);
    border-right: 1px solid rgba(255,255,255,0.06);
}

.sidebar-header {
    padding: 20px 20px;
    display: flex;
    align-items: center;
    gap: 14px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    background: rgba(255,255,255,0.02);
}

.sidebar-header img {
    height: 40px;
    width: 40px;
    object-fit: contain;
    border-radius: 10px;
}

.sidebar-header span {
    font-weight: 700;
    color: #fff;
    font-size: 18px;
    letter-spacing: -0.3px;
}

.sidebar-menu {
    list-style: none;
    padding: 12px 10px;
    flex: 1;
    overflow-y: auto;
}

.sidebar-menu li a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 16px;
    color: #94a3b8;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    margin-bottom: 2px;
}

.sidebar-menu li a:hover {
    background: var(--sidebar-hover);
    color: #e2e8f0;
}

.sidebar-menu li a.active {
    background: var(--sidebar-active);
    color: #818cf8;
    font-weight: 600;
}

.sidebar-menu li a.active i {
    color: #818cf8;
}

.sidebar-menu li a i {
    font-size: 18px;
    width: 22px;
    text-align: center;
    opacity: 0.7;
}

.sidebar-menu li a:hover i,
.sidebar-menu li a.active i {
    opacity: 1;
}

.menu-divider {
    padding: 18px 16px 8px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: #475569;
    font-weight: 600;
}

.sidebar-footer {
    padding: 14px 16px;
    border-top: 1px solid rgba(255,255,255,0.06);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(255,255,255,0.02);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #e2e8f0;
    font-size: 13px;
    min-width: 0;
}

.user-info i {
    font-size: 32px;
    color: #6366f1;
    flex-shrink: 0;
}

.user-info small {
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.btn-logout {
    color: #94a3b8;
    font-size: 18px;
    text-decoration: none;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    flex-shrink: 0;
}

.btn-logout:hover {
    background: rgba(239,68,68,0.15);
    color: #ef4444;
}

/* ===== MAIN CONTENT ===== */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}

.topbar {
    height: var(--topbar-height);
    background: rgba(255,255,255,0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 28px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.topbar h5 {
    font-weight: 700;
    color: var(--text);
    font-size: 18px;
    letter-spacing: -0.3px;
}

.content-wrapper {
    padding: 28px;
}

/* ===== STAT CARDS ===== */
.stat-card {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 22px 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    opacity: 0;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.stat-card:hover::before {
    opacity: 1;
}

.stat-card .icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    transition: var(--transition);
}

.stat-card:hover .icon {
    transform: scale(1.05);
}

.stat-card .icon.blue { background: linear-gradient(135deg, #dbeafe, #bfdbfe); color: #2563eb; }
.stat-card .icon.red { background: linear-gradient(135deg, #fee2e2, #fecaca); color: #ef4444; }
.stat-card .icon.green { background: linear-gradient(135deg, #dcfce7, #bbf7d0); color: #16a34a; }
.stat-card .icon.yellow { background: linear-gradient(135deg, #fef9c3, #fef08a); color: #ca8a04; }
.stat-card .icon.purple { background: linear-gradient(135deg, #f3e8ff, #e9d5ff); color: #9333ea; }
.stat-card .icon.indigo { background: linear-gradient(135deg, #e0e7ff, #c7d2fe); color: #4f46e5; }

.stat-card .number {
    font-size: 30px;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.5px;
    line-height: 1;
}

.stat-card .label {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
    margin-top: 4px;
}

/* ===== CARDS ===== */
.card-custom {
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.card-custom .card-header-custom {
    padding: 18px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
    background: var(--surface-2);
}

.card-custom .card-header-custom h6 {
    margin: 0;
    font-weight: 700;
    color: var(--text);
    font-size: 15px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-custom .card-header-custom h6 i {
    color: var(--primary);
}

.card-custom .card-body-custom {
    padding: 20px 24px;
}

/* ===== TABLES ===== */
.table-custom {
    margin: 0;
}

.table-custom th {
    background: var(--surface-2);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--border);
    padding: 12px 16px;
    white-space: nowrap;
}

.table-custom td {
    vertical-align: middle;
    font-size: 14px;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
}

.table-custom tbody tr {
    transition: var(--transition);
}

.table-custom tbody tr:hover {
    background: var(--primary-50);
}

.table-custom tbody tr:last-child td {
    border-bottom: none;
}

/* ===== FORMS ===== */
.form-custom .form-label {
    font-weight: 600;
    color: var(--text);
    font-size: 13px;
    margin-bottom: 6px;
}

.form-custom .form-control,
.form-custom .form-select {
    border-radius: var(--radius-sm);
    border: 1.5px solid var(--border);
    font-size: 14px;
    padding: 10px 14px;
    transition: var(--transition);
    background: var(--surface);
}

.form-custom .form-control:focus,
.form-custom .form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.12);
    outline: none;
}

.form-custom .form-control::placeholder {
    color: #94a3b8;
}

/* ===== BUTTONS ===== */
.btn {
    font-weight: 600;
    font-size: 14px;
    border-radius: var(--radius-sm);
    padding: 9px 18px;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    box-shadow: 0 1px 2px rgba(79,70,229,0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    box-shadow: 0 4px 12px rgba(79,70,229,0.35);
    transform: translateY(-1px);
}

.btn-success {
    background: linear-gradient(135deg, #059669, #10b981);
    color: #fff;
    box-shadow: 0 1px 2px rgba(16,185,129,0.3);
}

.btn-success:hover {
    box-shadow: 0 4px 12px rgba(16,185,129,0.35);
    transform: translateY(-1px);
}

.btn-outline-primary {
    border: 1.5px solid var(--primary);
    color: var(--primary);
    background: transparent;
}

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

.btn-outline-danger {
    border: 1.5px solid var(--danger);
    color: var(--danger);
    background: transparent;
}

.btn-outline-danger:hover {
    background: var(--danger);
    color: #fff;
}

.btn-outline-secondary {
    border: 1.5px solid var(--border);
    color: var(--text-secondary);
    background: transparent;
}

.btn-outline-secondary:hover {
    background: var(--surface-2);
    color: var(--text);
}

.btn-sm {
    font-size: 13px;
    padding: 6px 12px;
}

/* ===== BADGES ===== */
.badge {
    font-weight: 600;
    font-size: 11px;
    padding: 5px 10px;
    border-radius: 6px;
    letter-spacing: 0.3px;
}

.badge-l { background: #dbeafe; color: #1e40af; }
.badge-p { background: #fce7f3; color: #9d174d; }
.badge-active { background: #dcfce7; color: #166534; }
.badge-lulus { background: #fef9c3; color: #854d0e; }
.badge-keluar { background: #fee2e2; color: #991b1b; }

/* ===== WA BUTTON ===== */
.btn-wa {
    background: linear-gradient(135deg, #25d366, #128c7e);
    color: #fff;
    border: none;
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    text-decoration: none;
    transition: var(--transition);
    box-shadow: 0 1px 2px rgba(37,211,102,0.3);
}

.btn-wa:hover {
    box-shadow: 0 4px 12px rgba(37,211,102,0.4);
    transform: translateY(-1px);
    color: #fff;
}

/* ===== ALERTS ===== */
.alert {
    border-radius: var(--radius);
    border: none;
    font-size: 14px;
    font-weight: 500;
    padding: 14px 18px;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: var(--shadow-sm);
}

.alert-success {
    background: linear-gradient(135deg, #dcfce7, #bbf7d0);
    color: #166534;
}

.alert-danger {
    background: linear-gradient(135deg, #fee2e2, #fecaca);
    color: #991b1b;
}

.alert-warning {
    background: linear-gradient(135deg, #fef9c3, #fef08a);
    color: #854d0e;
}

.alert-info {
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
    color: #1e40af;
}

/* ===== MODALS ===== */
.modal-content {
    border-radius: var(--radius);
    border: none;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    border-bottom: 1px solid var(--border);
    padding: 18px 24px;
}

.modal-header .modal-title {
    font-weight: 700;
    font-size: 16px;
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    border-top: 1px solid var(--border);
    padding: 16px 24px;
}

/* ===== LOGIN ===== */
.login-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #312e81 100%);
    position: relative;
    overflow: hidden;
}

.login-wrapper::before {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(99,102,241,0.15), transparent);
    top: -100px;
    right: -100px;
    border-radius: 50%;
}

.login-wrapper::after {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(99,102,241,0.1), transparent);
    bottom: -50px;
    left: -50px;
    border-radius: 50%;
}

.login-card {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 44px;
    width: 100%;
    max-width: 440px;
    box-shadow: 0 25px 60px rgba(0,0,0,0.4);
    position: relative;
    z-index: 1;
    border: 1px solid rgba(255,255,255,0.2);
}

.login-card img {
    display: block;
    margin: 0 auto 16px;
}

.login-card h4 {
    font-weight: 800;
    color: var(--text);
    font-size: 24px;
    letter-spacing: -0.5px;
}

.login-card .form-control {
    border-radius: var(--radius-sm);
    border: 1.5px solid var(--border);
    padding: 12px 16px;
    font-size: 14px;
    transition: var(--transition);
}

.login-card .form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.12);
}

.login-card .btn-primary {
    padding: 13px;
    font-size: 15px;
    border-radius: var(--radius-sm);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.show { transform: translateX(0); }
    .main-content { margin-left: 0; }
    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.5);
        backdrop-filter: blur(4px);
        z-index: 999;
    }
    .sidebar-overlay.show { display: block; }
    .content-wrapper { padding: 16px; }
    .topbar { padding: 0 16px; }
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #94a3b8; }

/* ===== PASSWORD TOGGLE ===== */
.password-hidden, .password-shown {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 13px;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.content-wrapper > * {
    animation: fadeIn 0.3s ease-out;
}