/* VISE Admin Modern Dashboard Stylesheet (Light Theme) */
:root {
    --bg-main: #f1f5f9;
    --bg-card: #ffffff;
    --bg-sidebar: #ffffff;
    --border-color: #e2e8f0;
    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --glass-blur: 16px;
    --transition-speed: 0.25s;
    --shadow-premium: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    overflow-x: hidden;
}

/* Scrollbar customization */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-main);
}
::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}

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

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
    transition: width var(--transition-speed);
}

.sidebar-brand {
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-brand img {
    height: 36px;
    width: auto;
}

.sidebar-brand span {
    font-weight: 700;
    font-size: 18px;
    letter-spacing: 0.3px;
    color: var(--text-main);
}

.sidebar-menu {
    list-style: none;
    padding: 20px 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex-grow: 1;
    overflow-y: auto;
}

.menu-item a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    transition: all var(--transition-speed);
}

.menu-item a:hover, .menu-item.active a {
    color: var(--color-primary);
    background-color: rgba(59, 130, 246, 0.1);
}

.menu-item.active a {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--color-primary);
    font-weight: 600;
}

.menu-item a .material-symbols-outlined {
    font-size: 20px;
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-muted);
}

.logout-btn {
    background: none;
    border: none;
    color: var(--color-danger);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
}

/* Main Content Area */
.main-wrapper {
    margin-left: 260px;
    flex-grow: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    width: calc(100% - 260px);
}

/* Header */
.main-header {
    height: 70px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(var(--glass-blur));
    position: sticky;
    top: 0;
    z-index: 90;
}

.page-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-main);
}

.user-profile-header {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-avatar-header {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: #f1f5f9;
    border: 2px solid var(--border-color);
}

.user-info-header {
    text-align: right;
}

.user-name-header {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-main);
}

.user-role-header {
    font-size: 11px;
    color: var(--text-muted);
}

/* Main Container */
.main-container {
    padding: 32px;
    flex-grow: 1;
}

/* Grid System */
.grid-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: border-color var(--transition-speed);
}

.stat-card:hover {
    border-color: var(--color-primary);
}

.stat-value {
    font-size: 28px;
    font-weight: 800;
    color: var(--text-main);
    margin-top: 4px;
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-icon.primary { background: rgba(59, 130, 246, 0.1); color: var(--color-primary); }
.stat-icon.success { background: rgba(16, 185, 129, 0.1); color: var(--color-success); }
.stat-icon.warning { background: rgba(245, 158, 11, 0.1); color: var(--color-warning); }
.stat-icon.danger { background: rgba(239, 68, 68, 0.1); color: var(--color-danger); }

/* Dashboard Content Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 24px;
}

@media (max-width: 1024px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
}

/* Card */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
}

.card-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Form Styles */
.form-group {
    margin-bottom: 20px;
}

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

.form-control {
    width: 100%;
    background-color: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 16px;
    color: var(--text-main);
    font-size: 14px;
    outline: none;
    transition: all var(--transition-speed);
}

.form-control:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-weight: 600;
    font-size: 14px;
    padding: 12px 20px;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: all var(--transition-speed);
    text-decoration: none;
}

.btn-primary {
    background-color: var(--color-primary);
    color: #fff;
}
.btn-primary:hover {
    background-color: var(--color-primary-hover);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-secondary {
    background-color: #e2e8f0;
    color: #1e293b;
}
.btn-secondary:hover {
    background-color: #cbd5e1;
}

.btn-success {
    background-color: var(--color-success);
    color: #fff;
}
.btn-success:hover {
    background-color: #059669;
}

.btn-danger {
    background-color: var(--color-danger);
    color: #fff;
}
.btn-danger:hover {
    background-color: #dc2626;
}

.btn-sm {
    padding: 8px 12px;
    font-size: 12px;
    border-radius: 6px;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    width: 100%;
}

.table-custom {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 14px;
}

.table-custom th {
    background-color: #f1f5f9;
    color: var(--text-muted);
    font-weight: 600;
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
}

.table-custom td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-main);
}

.table-custom tr:hover td {
    background-color: #f8fafc;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 4px 8px;
    font-size: 11px;
    font-weight: 600;
    border-radius: 9999px;
    text-transform: uppercase;
}

.badge-admin { background: rgba(59, 130, 246, 0.1); color: var(--color-primary); }
.badge-giaovien { background: rgba(245, 158, 11, 0.1); color: var(--color-warning); }
.badge-hocsinh { background: rgba(16, 185, 129, 0.1); color: var(--color-success); }

/* Notifications / Alerts */
.alert {
    padding: 16px;
    border-radius: 8px;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    font-weight: 500;
}

.alert-success {
    background-color: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: #059669;
}

.alert-danger {
    background-color: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #dc2626;
}

/* Login Page specific styling */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-main);
    padding: 20px;
    height: 100vh;
}

.login-card {
    width: 100%;
    max-width: 420px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 40px;
    box-shadow: var(--shadow-premium);
    backdrop-filter: blur(var(--glass-blur));
}

.login-logo {
    text-align: center;
    margin-bottom: 24px;
}

.login-logo img {
    height: 48px;
    margin-bottom: 8px;
}

.login-logo h2 {
    font-weight: 800;
    font-size: 24px;
    color: var(--text-main);
}

.login-desc {
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 32px;
}

/* Modal styling */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.modal.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    width: 100%;
    max-width: 500px;
    padding: 28px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    transform: scale(0.9);
    transition: transform 0.3s;
}

.modal.active .modal-content {
    transform: scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
}

.modal-title {
    font-weight: 700;
    font-size: 18px;
    color: var(--text-main);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 24px;
    border-bottom: none;
    border-top: 1px solid var(--border-color);
    padding-top: 16px;
}

/* responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 70px;
    }
    .sidebar-brand span, .sidebar-footer span, .menu-text {
        display: none;
    }
    .main-wrapper {
        margin-left: 70px;
        width: calc(100% - 70px);
    }
    .main-header {
        padding: 0 16px;
    }
    .main-container {
        padding: 16px;
    }
}