:root {
    --primary: #4f46e5; /* ���� */
    --primary-hover: #4338ca;
    --bg-body: #f3f4f6;
    --bg-card: #ffffff;
    --text-main: #111827;
    --text-sub: #6b7280;
    --border: #e5e7eb;
    --sidebar-w: 260px;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    outline: none;
}

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background: var(--bg-body);
    color: var(--text-main);
    height: 100vh;
    overflow: hidden;
}

/* ���ֿ�� */
.layout-container {
    display: flex;
    height: 100%;
}

/* �������ʽ */
.sidebar {
    width: var(--sidebar-w);
    background: #1e293b;
    color: #fff;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    box-shadow: 4px 0 10px rgba(0,0,0,0.05);
}

.logo-area {
    height: 64px;
    display: flex;
    align-items: center;
    padding: 0 20px;
    gap: 12px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

    .logo-area h1 {
        font-size: 18px;
        font-weight: 600;
        letter-spacing: 0.5px;
    }

.user-card {
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(0,0,0,0.1);
}

.avatar {
    width: 40px;
    height: 40px;
    background: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: #fff;
}

.user-card .info .name {
    font-size: 14px;
    font-weight: 500;
}

.user-card .info .role {
    font-size: 12px;
    color: #94a3b8;
}

.nav-links {
    flex: 1;
    overflow-y: auto;
    padding: 10px 0;
}

.nav-group {
    padding: 16px 20px 8px;
    font-size: 11px;
    text-transform: uppercase;
    color: #64748b;
    font-weight: 700;
    letter-spacing: 0.05em;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: #cbd5e1;
    text-decoration: none;
    transition: all 0.2s;
    font-size: 14px;
}

    .nav-item:hover {
        background: rgba(255,255,255,0.05);
        color: #fff;
    }

    .nav-item.active {
        background: var(--primary);
        color: #fff;
        border-right: 3px solid #a5b4fc;
    }

    .nav-item .material-symbols-rounded {
        font-size: 20px;
    }

.nav-footer {
    border-top: 1px solid rgba(255,255,255,0.1);
    margin-top: auto;
}

/* �������� */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.top-header {
    height: 64px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 30px;
}

.page-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-main);
}

.content-body {
    flex: 1;
    overflow-y: auto;
    padding: 30px;
}

/* ͨ����� */
.grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 20px;
}

.card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    border: 1px solid var(--border);
}

    .card h2 {
        font-size: 16px;
        font-weight: 600;
        margin-bottom: 16px;
        display: flex;
        align-items: center;
        gap: 8px;
        color: var(--text-main);
        border-left: 4px solid var(--primary);
        padding-left: 12px;
    }

/* ���������� */
.form {
    display: grid;
    gap: 16px;
}

    .form label {
        display: block;
        font-size: 13px;
        font-weight: 500;
        color: var(--text-sub);
        margin-bottom: 4px;
    }

input, select, textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.2s;
}

    input:focus, select:focus {
        border-color: var(--primary);
        box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
    }

/* ��ť */
button {
    cursor: pointer;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    border: none;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

    button[type="submit"], button.primary {
        background: var(--primary);
        color: #fff;
    }

    button:hover {
        opacity: 0.9;
        transform: translateY(-1px);
    }

    button.secondary {
        background: #fff;
        border: 1px solid var(--border);
        color: var(--text-main);
    }

        button.secondary:hover {
            background: #f8fafc;
        }

    button.danger {
        background: #fee2e2;
        color: var(--danger);
    }

    button.btn-text {
        background: transparent;
        color: var(--text-sub);
        padding: 8px;
    }

        button.btn-text:hover {
            color: var(--danger);
        }

/* ���� */
.table-container {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: 8px;
}

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

    .table th {
        background: #f8fafc;
        text-align: left;
        padding: 12px 16px;
        font-weight: 600;
        color: var(--text-sub);
        border-bottom: 1px solid var(--border);
    }

    .table td {
        padding: 12px 16px;
        border-bottom: 1px solid var(--border);
        color: var(--text-main);
    }

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

    .table tr:hover {
        background: #f9fafb;
    }

/* ״̬���� */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    border-radius: 99px;
    font-size: 12px;
    font-weight: 500;
}

    .badge.success {
        background: #d1fae5;
        color: #065f46;
    }

    .badge.warn {
        background: #fef3c7;
        color: #92400e;
    }

    .badge.info {
        background: #dbeafe;
        color: #1e40af;
    }

    .badge.error {
        background: #fee2e2;
        color: #991b1b;
    }

/* ���� */
.row {
    display: flex;
    gap: 12px;
    align-items: center;
}

.stat-card {
    background: linear-gradient(135deg, #fff, #f8fafc);
    border-left: 4px solid var(--primary);
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-main);
    margin: 8px 0 4px;
}

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

.hidden {
    display: none !important;
}


.mobile-only-item {
    display: none;
}


@media (max-width: 768px) {

    body {
        height: auto !important;
        overflow: auto !important;
        overflow-x: hidden; 
    }

    .layout-container {
        flex-direction: column;
        height: auto;
        overflow: auto;
    }

    .sidebar {
        display: flex !important;
        width: var(--sidebar-w); 
        position: fixed;
        top: 0;
        bottom: 0;
        left: 0;
        z-index: 1000;
        transform: translateX(calc(-1 * var(--sidebar-w)));
        box-shadow: 0 0 10px rgba(0,0,0,0.5);
    }

    .sidebar.sidebar-open {
        transform: translateX(0);
    }

    .mobile-only-item {
        display: inline-flex !important;
    }

    .main-content {
        width: 100%;
        margin-left: 0;
        overflow-y: auto;
    }

    .top-header {
        padding: 0 15px;
    }

    .page-title {
        font-size: 18px;
    }

    .content-body {
        padding: 15px;
    }

    .grid {
        grid-template-columns: repeat(1, 1fr);
        gap: 15px;
    }

    .card {
        padding: 16px;
        border-radius: 8px;
    }

    .form {
        gap: 12px;
    }

    .table-container {
        margin-top: 15px;
    }

    .table th, .table td {
        padding: 10px 12px;
    }

    .stat-card {
        grid-column: span 1 !important;
    }

    .row {
        flex-wrap: wrap;
    }

    #btn-main-logout {
        margin-left: 0 !important;
    }
}