/* ==================== VARIABLES ==================== */
:root {
    --primary: #e91e63;
    --primary-dark: #c2185b;
    --primary-light: #f8bbd9;
    --secondary: #9c27b0;
    --success: #4caf50;
    --warning: #ff9800;
    --danger: #f44336;
    --info: #2196f3;
    --dark: #212121;
    --gray-900: #333;
    --gray-700: #555;
    --gray-500: #888;
    --gray-300: #ccc;
    --gray-100: #f5f5f5;
    --white: #fff;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-lg: 0 5px 20px rgba(0,0,0,0.15);
    --radius: 8px;
    --transition: all 0.3s ease;
}

/* ==================== RESET & BASE ==================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--gray-900);
    background: var(--gray-100);
    min-height: 100vh;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
}

img {
    max-width: 100%;
    height: auto;
}

/* ==================== LAYOUT ==================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

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

/* Sidebar */
.sidebar {
    width: 260px;
    background: linear-gradient(180deg, var(--dark) 0%, #1a1a2e 100%);
    color: var(--white);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: 1000;
}

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

.sidebar-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-logo span {
    color: var(--white);
}

.sidebar-nav {
    padding: 20px 0;
}

.nav-item {
    display: block;
    padding: 12px 20px;
    color: rgba(255,255,255,0.7);
    display: flex;
    align-items: center;
    gap: 12px;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.nav-item:hover, .nav-item.active {
    background: rgba(255,255,255,0.1);
    color: var(--white);
    border-left-color: var(--primary);
}

.nav-item i {
    width: 20px;
    text-align: center;
}

.nav-divider {
    height: 1px;
    background: rgba(255,255,255,0.1);
    margin: 10px 20px;
}

.nav-section-title {
    padding: 10px 20px;
    font-size: 0.75rem;
    text-transform: uppercase;
    color: rgba(255,255,255,0.4);
    letter-spacing: 1px;
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 260px;
    min-height: 100vh;
}

/* Header */
.header {
    background: var(--white);
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    padding: 8px 15px;
    border-radius: var(--radius);
    transition: var(--transition);
}

.user-menu:hover {
    background: var(--gray-100);
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--primary);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

/* Page Content */
.page-content {
    padding: 30px;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.page-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--dark);
}

/* ==================== CARDS ==================== */
.card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.card-header {
    padding: 20px;
    border-bottom: 1px solid var(--gray-100);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0;
}

.card-body {
    padding: 20px;
}

.card-footer {
    padding: 15px 20px;
    border-top: 1px solid var(--gray-100);
    background: var(--gray-100);
    border-radius: 0 0 var(--radius) var(--radius);
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 25px;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary);
}

.stat-card.success::before { background: var(--success); }
.stat-card.warning::before { background: var(--warning); }
.stat-card.info::before { background: var(--info); }
.stat-card.danger::before { background: var(--danger); }

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 15px;
    background: var(--primary-light);
    color: var(--primary);
}

.stat-card.success .stat-icon { background: #c8e6c9; color: var(--success); }
.stat-card.warning .stat-icon { background: #ffe0b2; color: var(--warning); }
.stat-card.info .stat-icon { background: #bbdefb; color: var(--info); }
.stat-card.danger .stat-icon { background: #ffcdd2; color: var(--danger); }

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark);
    line-height: 1.2;
}

.stat-label {
    color: var(--gray-500);
    font-size: 0.875rem;
    margin-top: 5px;
}

.stat-change {
    font-size: 0.8rem;
    margin-top: 10px;
}

.stat-change.positive { color: var(--success); }
.stat-change.negative { color: var(--danger); }

/* ==================== TABLES ==================== */
.table-responsive {
    overflow-x: auto;
}

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

th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--gray-100);
}

th {
    background: var(--gray-100);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    color: var(--gray-700);
}

tr:hover {
    background: rgba(233, 30, 99, 0.02);
}

/* ==================== FORMS ==================== */
.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--gray-700);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="url"],
input[type="date"],
select,
textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--white);
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

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

.form-hint {
    font-size: 0.85rem;
    color: var(--gray-500);
    margin-top: 5px;
}

.form-error {
    color: var(--danger);
    font-size: 0.85rem;
    margin-top: 5px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

/* ==================== BUTTONS ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--primary-dark);
    color: var(--white);
}

.btn-secondary {
    background: var(--gray-500);
    color: var(--white);
}

.btn-secondary:hover {
    background: var(--gray-700);
}

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

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

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

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

.btn-sm {
    padding: 8px 16px;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 16px 32px;
    font-size: 1.125rem;
}

.btn-block {
    width: 100%;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* ==================== BADGES ==================== */
.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-success { background: #c8e6c9; color: #2e7d32; }
.badge-warning { background: #ffe0b2; color: #ef6c00; }
.badge-danger { background: #ffcdd2; color: #c62828; }
.badge-info { background: #bbdefb; color: #1565c0; }
.badge-secondary { background: var(--gray-300); color: var(--gray-700); }

/* ==================== ALERTS ==================== */
.alert {
    padding: 15px 20px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.alert-success { background: #c8e6c9; color: #2e7d32; border-left: 4px solid var(--success); }
.alert-warning { background: #ffe0b2; color: #ef6c00; border-left: 4px solid var(--warning); }
.alert-danger { background: #ffcdd2; color: #c62828; border-left: 4px solid var(--danger); }
.alert-info { background: #bbdefb; color: #1565c0; border-left: 4px solid var(--info); }

/* ==================== MODALS ==================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--white);
    border-radius: var(--radius);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid var(--gray-100);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--gray-500);
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    padding: 15px 20px;
    border-top: 1px solid var(--gray-100);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* ==================== CHARTS PLACEHOLDER ==================== */
.chart-container {
    position: relative;
    height: 300px;
}

/* ==================== TABS ==================== */
.tabs {
    display: flex;
    border-bottom: 2px solid var(--gray-100);
    margin-bottom: 20px;
}

.tab {
    padding: 15px 25px;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: var(--transition);
    color: var(--gray-500);
    font-weight: 500;
}

.tab:hover {
    color: var(--primary);
}

.tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ==================== COPY BUTTON ==================== */
.copy-container {
    display: flex;
    gap: 10px;
}

.copy-container input {
    flex: 1;
    background: var(--gray-100);
}

.copy-btn {
    padding: 12px 15px;
    background: var(--gray-300);
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

.copy-btn:hover {
    background: var(--primary);
    color: var(--white);
}

/* ==================== DATE PICKER ==================== */
.date-range {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--white);
    padding: 10px 15px;
    border-radius: var(--radius);
    border: 1px solid var(--gray-300);
}

.date-range input {
    border: none;
    padding: 5px;
    width: 130px;
}

/* ==================== PAGINATION ==================== */
.pagination {
    display: flex;
    justify-content: center;
    margin-top: 30px;
}

.pagination ul {
    display: flex;
    list-style: none;
    gap: 5px;
}

.pagination li a,
.pagination li span {
    display: block;
    padding: 10px 15px;
    border-radius: var(--radius);
    background: var(--white);
    color: var(--gray-700);
    transition: var(--transition);
}

.pagination li a:hover {
    background: var(--primary-light);
    color: var(--primary);
}

.pagination li.active a {
    background: var(--primary);
    color: var(--white);
}

/* ==================== DROPDOWN ==================== */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    display: none;
    z-index: 1000;
}

.dropdown-menu.show {
    display: block;
}

.dropdown-item {
    display: block;
    padding: 12px 20px;
    color: var(--gray-700);
    transition: var(--transition);
}

.dropdown-item:hover {
    background: var(--gray-100);
    color: var(--primary);
}

.dropdown-divider {
    height: 1px;
    background: var(--gray-100);
}

/* ==================== LOADING ==================== */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 50px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--gray-300);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ==================== EMPTY STATE ==================== */
.empty-state {
    text-align: center;
    padding: 50px 20px;
    color: var(--gray-500);
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 20px;
    opacity: 0.5;
}

.empty-state h3 {
    margin-bottom: 10px;
    color: var(--gray-700);
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
        transition: var(--transition);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .mobile-menu-btn {
        display: block !important;
    }
}

@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .page-header {
        flex-direction: column;
        gap: 15px;
    }
    
    .header {
        padding: 15px;
    }
    
    .page-content {
        padding: 15px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* ==================== UTILITY CLASSES ==================== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.text-muted { color: var(--gray-500); }
.font-bold { font-weight: 700; }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }
.p-20 { padding: 20px; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-10 { gap: 10px; }
.gap-20 { gap: 20px; }
.hidden { display: none; }