:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --bg-sidebar: #1e1b4b;
    --bg-sidebar-hover: #312e81;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-light: #cbd5e1;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-main);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

.app-container { display: flex; min-height: 100vh; }

.sidebar {
    width: 260px;
    background: linear-gradient(180deg, var(--bg-sidebar) 0%, #312e81 100%);
    color: white;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: 100;
    transition: var(--transition);
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-logo-icon {
    width: 42px;
    height: 42px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.sidebar-logo-text h1 { font-size: 18px; font-weight: 700; }
.sidebar-logo-text span { font-size: 12px; opacity: 0.7; }

.sidebar-nav { padding: 16px 12px; }

.nav-section { margin-bottom: 24px; }

.nav-section-title {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: rgba(255,255,255,0.4);
    padding: 8px 12px;
    font-weight: 600;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 4px;
}

.nav-item:hover { background: var(--bg-sidebar-hover); color: white; }
.nav-item.active { background: var(--primary); color: white; }

.nav-item i { width: 20px; text-align: center; font-size: 16px; }
.nav-item span { font-size: 14px; font-weight: 500; }

.main-content {
    flex: 1;
    margin-left: 260px;
    min-height: 100vh;
    transition: var(--transition);
}

.topbar {
    background: var(--bg-card);
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 50;
}

.topbar-left { display: flex; align-items: center; gap: 16px; }

.menu-toggle {
    display: none;
    width: 40px;
    height: 40px;
    border: none;
    background: var(--bg-main);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 18px;
    color: var(--text-secondary);
}

.page-title h2 { font-size: 20px; font-weight: 700; color: var(--text-primary); }
.page-title p { font-size: 13px; color: var(--text-secondary); }

.topbar-right { display: flex; align-items: center; gap: 12px; }

.topbar-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--bg-main);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 16px;
    color: var(--text-secondary);
    position: relative;
    transition: var(--transition);
}

.topbar-btn:hover { background: var(--border-color); color: var(--text-primary); }

.user-menu {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 12px 6px 6px;
    background: var(--bg-main);
    border-radius: 24px;
    cursor: pointer;
}

.user-avatar {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 14px;
    font-weight: 600;
}

.user-info { display: none; }
.user-info span { font-size: 13px; font-weight: 600; color: var(--text-primary); }
.user-info small { font-size: 11px; color: var(--text-secondary); }

.page-content { padding: 24px; }

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }

.stat-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.stat-icon.primary { background: rgba(99, 102, 241, 0.1); color: var(--primary); }
.stat-icon.success { background: rgba(16, 185, 129, 0.1); color: var(--success); }
.stat-icon.warning { background: rgba(245, 158, 11, 0.1); color: var(--warning); }
.stat-icon.danger { background: rgba(239, 68, 68, 0.1); color: var(--danger); }

.stat-value { font-size: 28px; font-weight: 700; color: var(--text-primary); margin-bottom: 4px; }
.stat-label { font-size: 13px; color: var(--text-secondary); }

.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}

.card-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

.card-title { font-size: 16px; font-weight: 700; color: var(--text-primary); }

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

.card-body { padding: 24px; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 18px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn i { font-size: 14px; }

.btn-primary { background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%); color: white; }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4); }

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

.btn-warning { background: var(--warning); color: white; }
.btn-warning:hover { background: #d97706; }

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

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}
.btn-outline:hover { background: var(--bg-main); color: var(--text-primary); }

.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-lg { padding: 14px 24px; font-size: 15px; }

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

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.form-input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--text-primary);
    background: var(--bg-card);
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-input::placeholder { color: var(--text-muted); }

.form-row { display: flex; gap: 16px; flex-wrap: wrap; }
.form-row .form-group { flex: 1; min-width: 150px; }

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2364748b'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px;
    padding-right: 40px;
}

.form-textarea {
    min-height: 100px;
    resize: vertical;
}

.table-container { overflow-x: auto; }

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    background: var(--bg-main);
}

.data-table td { font-size: 14px; color: var(--text-primary); }

.data-table tbody tr:hover { background: rgba(99, 102, 241, 0.02); }

.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
}

.badge-primary { background: rgba(99, 102, 241, 0.1); color: var(--primary); }
.badge-success { background: rgba(16, 185, 129, 0.1); color: var(--success); }
.badge-warning { background: rgba(245, 158, 11, 0.1); color: var(--warning); }
.badge-danger { background: rgba(239, 68, 68, 0.1); color: var(--danger); }
.badge-info { background: rgba(59, 130, 246, 0.1); color: var(--info); }

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

.action-btn {
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: var(--transition);
}

.action-btn:hover { transform: scale(1.1); }

.action-btn.edit { background: rgba(59, 130, 246, 0.1); color: var(--info); }
.action-btn.delete { background: rgba(239, 68, 68, 0.1); color: var(--danger); }
.action-btn.success { background: rgba(16, 185, 129, 0.1); color: var(--success); }
.action-btn.warning { background: rgba(245, 158, 11, 0.1); color: var(--warning); }

.search-input {
    position: relative;
    flex: 1;
    max-width: 300px;
}

.search-input i {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.search-input .form-input { padding-left: 40px; }

.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-secondary);
}

.empty-state i { font-size: 48px; margin-bottom: 16px; opacity: 0.3; }
.empty-state h3 { font-size: 16px; margin-bottom: 8px; color: var(--text-primary); }
.empty-state p { font-size: 14px; }

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    padding: 16px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal-overlay.show { opacity: 1; visibility: visible; }

.modal {
    background: var(--bg-card);
    border-radius: var(--radius);
    width: 100%;
    max-width: 480px;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: var(--transition);
}

.modal-overlay.show .modal { transform: scale(1); }

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-title { font-size: 18px; font-weight: 700; }

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--bg-main);
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    color: var(--text-secondary);
}

.modal-body { padding: 24px; }

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

.toast {
    position: fixed;
    top: 24px;
    right: 24px;
    background: var(--text-primary);
    color: white;
    padding: 14px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    z-index: 300;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: var(--shadow-lg);
    transform: translateX(120%);
    transition: var(--transition);
}

.toast.show { transform: translateX(0); }
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
.toast.warning { background: var(--warning); }

.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--bg-sidebar) 0%, #312e81 50%, var(--primary-dark) 100%);
    padding: 16px;
}

.login-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 40px;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow-lg);
}

.login-header { text-align: center; margin-bottom: 32px; }

.login-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 28px;
    color: white;
}

.login-header h1 { font-size: 24px; margin-bottom: 8px; }
.login-header p { color: var(--text-secondary); font-size: 14px; }

.login-error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    margin-bottom: 20px;
    display: none;
}

.login-btn { width: 100%; padding: 14px; font-size: 15px; }

.generated-codes {
    background: var(--bg-main);
    border-radius: var(--radius-sm);
    padding: 16px;
    margin-top: 16px;
}

.generated-codes h4 {
    font-size: 14px;
    color: var(--text-primary);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.generated-list {
    font-family: 'Monaco', 'Consolas', monospace;
    font-size: 13px;
    line-height: 1.8;
    color: var(--text-primary);
    max-height: 200px;
    overflow-y: auto;
}

.tool-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    background: var(--bg-main);
    padding: 6px;
    border-radius: var(--radius-sm);
}

.tool-tab {
    flex: 1;
    padding: 12px 16px;
    border: none;
    background: transparent;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
}

.tool-tab:hover { color: var(--text-primary); }
.tool-tab.active { background: var(--bg-card); color: var(--primary); box-shadow: var(--shadow); }

.progress-bar {
    height: 8px;
    background: var(--bg-main);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 12px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: 4px;
    transition: width 0.3s;
}

.hidden { display: none !important; }

@media (max-width: 1200px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 992px) {
    .sidebar {
        transform: translateX(-100%);
    }

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

    .main-content { margin-left: 0; }

    .menu-toggle { display: flex; align-items: center; justify-content: center; }

    .sidebar-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 99;
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .sidebar-overlay.show { opacity: 1; visibility: visible; }
}

@media (max-width: 768px) {
    .stats-grid { grid-template-columns: 1fr; }

    .page-content { padding: 16px; }

    .card-header { padding: 16px; }

    .card-body { padding: 16px; }

    .topbar { padding: 12px 16px; }

    .user-info { display: block; }

    .search-input { max-width: none; }

    .form-row { flex-direction: column; }

    .form-row .form-group { min-width: auto; }

    .data-table th,
    .data-table td { padding: 12px; font-size: 13px; }

    .tool-tabs { flex-direction: column; }
}

@media (max-width: 480px) {
    .login-card { padding: 24px; }

    .page-title h2 { font-size: 18px; }

    .btn { padding: 8px 14px; font-size: 13px; }

    .modal { margin: 8px; }
}

.fade-in {
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}