/* ============================================
   Enhanced SEO Management System - Styles
   ============================================ */

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #8b5cf6;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    
    --bg-light: #ffffff;
    --bg-light-secondary: #f9fafb;
    --text-light: #1f2937;
    --text-light-secondary: #6b7280;
    --border-light: #e5e7eb;
    
    --bg-dark: #0f172a;
    --bg-dark-secondary: #1e293b;
    --text-dark: #f1f5f9;
    --text-dark-secondary: #cbd5e1;
    --border-dark: #334155;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
}

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

html, body {
    height: 100%;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-light);
    background-color: var(--bg-light);
    transition: background-color 0.3s ease, color 0.3s ease;
}

body.dark-mode {
    background-color: var(--bg-dark);
    color: var(--text-dark);
}

/* ============================================
   Layout Structure
   ============================================ */

.app-container {
    display: grid;
    grid-template-columns: 250px 1fr;
    height: 100vh;
    overflow: hidden;
}

.sidebar {
    background-color: var(--bg-light);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

body.dark-mode .sidebar {
    background-color: var(--bg-dark-secondary);
    border-right-color: var(--border-dark);
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-light);
}

body.dark-mode .sidebar-header {
    border-bottom-color: var(--border-dark);
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.navbar-brand:hover {
    color: var(--primary-dark);
}

.sidebar-nav {
    flex: 1;
    padding: 1rem 0;
    overflow-y: auto;
}

.sidebar-menu {
    list-style: none;
}

.sidebar-menu li {
    margin: 0;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.5rem;
    color: var(--text-light-secondary);
    text-decoration: none;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

body.dark-mode .sidebar-menu a {
    color: var(--text-dark-secondary);
}

.sidebar-menu a:hover,
.sidebar-menu a.active {
    background-color: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    border-left-color: var(--primary);
}

.sidebar-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

body.dark-mode .sidebar-footer {
    border-top-color: var(--border-dark);
}

.user-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.user-name {
    font-weight: 600;
    font-size: 0.875rem;
}

.user-role {
    font-size: 0.75rem;
    color: var(--text-light-secondary);
}

body.dark-mode .user-role {
    color: var(--text-dark-secondary);
}

.main-content {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.navbar {
    background-color: var(--bg-light);
    border-bottom: 1px solid var(--border-light);
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

body.dark-mode .navbar {
    background-color: var(--bg-dark-secondary);
    border-bottom-color: var(--border-dark);
}

.navbar-left, .navbar-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 600;
}

.content-body {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    background-color: var(--bg-light-secondary);
}

body.dark-mode .content-body {
    background-color: var(--bg-dark);
}

/* ============================================
   Cards
   ============================================ */

.card {
    background-color: var(--bg-light);
    border: 1px solid var(--border-light);
    border-radius: 0.75rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    overflow: hidden;
}

body.dark-mode .card {
    background-color: var(--bg-dark-secondary);
    border-color: var(--border-dark);
}

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

.card-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-light);
}

body.dark-mode .card-header {
    border-bottom-color: var(--border-dark);
}

.card-header h3 {
    margin: 0;
    font-size: 1.125rem;
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border-light);
    background-color: var(--bg-light-secondary);
}

body.dark-mode .card-footer {
    border-top-color: var(--border-dark);
    background-color: var(--bg-dark);
}

/* ============================================
   Forms
   ============================================ */

.form-group {
    margin-bottom: 1.5rem;
}

.form-group:last-child {
    margin-bottom: 0;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    font-size: 0.875rem;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="date"],
input[type="url"],
textarea,
select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-light);
    border-radius: 0.5rem;
    font-family: inherit;
    font-size: 0.875rem;
    transition: all 0.3s ease;
    background-color: var(--bg-light);
    color: var(--text-light);
}

body.dark-mode input[type="text"],
body.dark-mode input[type="email"],
body.dark-mode input[type="password"],
body.dark-mode input[type="number"],
body.dark-mode input[type="date"],
body.dark-mode input[type="url"],
body.dark-mode textarea,
body.dark-mode select {
    background-color: var(--bg-dark);
    border-color: var(--border-dark);
    color: var(--text-dark);
}

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

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

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    white-space: nowrap;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: translateY(0);
}

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

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

.btn-secondary {
    background-color: #6b7280;
    color: white;
}

.btn-secondary:hover {
    background-color: #4b5563;
}

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

.btn-success:hover {
    background-color: #059669;
}

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

.btn-danger:hover {
    background-color: #dc2626;
}

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

.btn-warning:hover {
    background-color: #d97706;
}

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

.btn-info:hover {
    background-color: #2563eb;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
}

.btn-block {
    width: 100%;
    display: flex;
}

.btn-outline {
    background-color: transparent;
    border: 1px solid currentColor;
}

/* ============================================
   Tables
   ============================================ */

.table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.5rem;
}

.table thead {
    background-color: var(--bg-light-secondary);
}

body.dark-mode .table thead {
    background-color: var(--bg-dark);
}

.table th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.875rem;
    border-bottom: 2px solid var(--border-light);
}

body.dark-mode .table th {
    border-bottom-color: var(--border-dark);
}

.table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-light);
}

body.dark-mode .table td {
    border-bottom-color: var(--border-dark);
}

.table tbody tr:hover {
    background-color: var(--bg-light-secondary);
}

body.dark-mode .table tbody tr:hover {
    background-color: var(--bg-dark-secondary);
}

/* ============================================
   Badges
   ============================================ */

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-primary {
    background-color: rgba(99, 102, 241, 0.1);
    color: var(--primary);
}

.badge-success {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success);
}

.badge-danger {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.badge-warning {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

.badge-info {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--info);
}

/* ============================================
   Alerts
   ============================================ */

.alert {
    padding: 1rem;
    margin-bottom: 1.5rem;
    border-radius: 0.5rem;
    border-left: 4px solid;
    animation: slideIn 0.3s ease;
}

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

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
    border-color: var(--success);
}

body.dark-mode .alert-success {
    background-color: rgba(16, 185, 129, 0.1);
    color: #86efac;
}

.alert-danger {
    background-color: #fee2e2;
    color: #7f1d1d;
    border-color: var(--danger);
}

body.dark-mode .alert-danger {
    background-color: rgba(239, 68, 68, 0.1);
    color: #fca5a5;
}

.alert-warning {
    background-color: #fef3c7;
    color: #78350f;
    border-color: var(--warning);
}

body.dark-mode .alert-warning {
    background-color: rgba(245, 158, 11, 0.1);
    color: #fcd34d;
}

.alert-info {
    background-color: #dbeafe;
    color: #0c2d6b;
    border-color: var(--info);
}

body.dark-mode .alert-info {
    background-color: rgba(59, 130, 246, 0.1);
    color: #93c5fd;
}

/* ============================================
   Utilities
   ============================================ */

.d-flex {
    display: flex;
}

.align-items-center {
    align-items: center;
}

.justify-content-between {
    justify-content: space-between;
}

.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }
.gap-4 { gap: 1.5rem; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }

.ml-2 { margin-left: 0.5rem; }
.ml-3 { margin-left: 1rem; }

.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 1rem; }
.p-4 { padding: 1.5rem; }

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.text-muted {
    color: var(--text-light-secondary);
}

body.dark-mode .text-muted {
    color: var(--text-dark-secondary);
}

.hidden { display: none; }
.visible { display: block; }

/* ============================================
   Grid System
   ============================================ */

.row {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.col-1 { grid-column: span 1; }
.col-2 { grid-column: span 2; }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-10 { grid-column: span 10; }
.col-11 { grid-column: span 11; }
.col-12 { grid-column: span 12; }

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 1024px) {
    .app-container {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100vh;
        z-index: 1000;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .col-6 { grid-column: span 12; }
    .col-4 { grid-column: span 6; }
    .col-3 { grid-column: span 6; }
}

@media (max-width: 768px) {
    .content-body {
        padding: 1rem;
    }
    
    .col-4 { grid-column: span 12; }
    .col-3 { grid-column: span 12; }
    .col-2 { grid-column: span 6; }
    
    .table {
        font-size: 0.875rem;
    }
    
    .table th, .table td {
        padding: 0.75rem 0.5rem;
    }
    
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    .navbar {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
    
    .col-2 { grid-column: span 12; }
    .col-6 { grid-column: span 12; }
    
    .card {
        border-radius: 0.5rem;
    }
    
    .card-header, .card-body, .card-footer {
        padding: 1rem;
    }
}

/* ============================================
   Loading Animation
   ============================================ */

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(99, 102, 241, 0.2);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ============================================
   Charts
   ============================================ */

.chart-container {
    position: relative;
    height: 300px;
    margin-bottom: 1.5rem;
}