/* ===== CSS Variables ===== */
:root {
    --primary: #06B6D4;
    --secondary: #3B82F6;
    --accent: #10B981;
    --dark-accent: #0891B2;
    --light-accent: #67E8F9;
    --background: #0F172A;
    --text: #F1F5F9;
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
    --white: #FFFFFF;
    --gray-100: #1E293B;
    --gray-200: #334155;
    --gray-300: #475569;
    --gray-400: #64748B;
    --gray-500: #94A3B8;
    --gray-600: #CBD5E1;
    --gray-700: #E2E8F0;
    --gray-800: #F1F5F9;
    --gray-900: #F8FAFC;
    
    --sidebar-width: 280px;
    --header-height: 80px;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* ===== Base Styles ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--background);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 0.5rem;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }

/* ===== Layout ===== */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--gray-100);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    border-right: 1px solid var(--gray-200);
}

.sidebar-header {
    padding: 2rem 1.5rem;
    border-bottom: 1px solid var(--gray-200);
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    font-family: 'Poppins', sans-serif;
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo img {
    height: 50px;
    width: auto;
    max-width: 100%;
}

.logo i {
    font-size: 1.75rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.sidebar-nav {
    flex: 1;
    padding: 1.5rem 0;
    overflow-y: auto;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.875rem 1.5rem;
    color: var(--gray-500);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background: var(--gray-200);
    color: var(--primary);
}

.nav-item.active {
    background: linear-gradient(90deg, rgba(6, 182, 212, 0.15), transparent);
    color: var(--primary);
    border-left-color: var(--primary);
}

.nav-item i {
    font-size: 1.25rem;
    width: 24px;
    text-align: center;
}

.sidebar-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--gray-200);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.125rem;
}

.user-details {
    flex: 1;
}

.user-name {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text);
}

.user-plan {
    font-size: 0.75rem;
    color: var(--gray-500);
}

.main-content {
    margin-left: var(--sidebar-width);
    padding: 2rem;
    min-height: 100vh;
}

/* ===== Page Styles ===== */
.page {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.page.active {
    display: block;
}

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

.page-header {
    margin-bottom: 2rem;
}

.page-header h1 {
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--gray-500);
    font-size: 1.125rem;
}

/* ===== Stats Grid ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--gray-100);
    padding: 1.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 1.25rem;
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid var(--gray-200);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.75rem;
}

.stat-info h3 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text);
}

.stat-info p {
    color: var(--gray-500);
    font-size: 0.875rem;
}

/* ===== Quick Actions ===== */
.quick-actions {
    margin-bottom: 2rem;
}

.quick-actions h2 {
    margin-bottom: 1rem;
}

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

.action-btn {
    background: var(--gray-100);
    border: 2px solid var(--gray-200);
    padding: 1.5rem;
    border-radius: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    color: var(--text);
}

.action-btn:hover {
    border-color: var(--primary);
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.1), rgba(59, 130, 246, 0.1));
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.action-btn i {
    font-size: 2rem;
    color: var(--primary);
}

/* ===== Creative Grid ===== */
.recent-creatives h2 {
    margin-bottom: 1rem;
}

.creative-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.creative-card {
    background: var(--gray-100);
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
    cursor: pointer;
    border: 1px solid var(--gray-200);
}

.creative-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.creative-preview {
    width: 100%;
    height: 200px;
    background: var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.creative-preview canvas {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.creative-info {
    padding: 1rem;
}

.creative-info h4 {
    margin-bottom: 0.5rem;
    color: var(--text);
}

.creative-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-bottom: 1rem;
}

.creative-actions {
    display: flex;
    gap: 0.5rem;
}

.creative-actions button {
    flex: 1;
    padding: 0.5rem;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
}

.btn-edit {
    background: var(--gray-100);
    color: var(--text);
}

.btn-edit:hover {
    background: var(--gray-200);
}

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

.btn-download-card:hover {
    background: var(--secondary);
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem 2rem;
    color: var(--gray-400);
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.empty-state p {
    font-size: 1.125rem;
}

/* ===== Create Page ===== */
.create-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.create-form {
    background: var(--gray-100);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
}

.form-section {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--gray-200);
}

.form-section:last-of-type {
    border-bottom: none;
}

.form-section h3 {
    margin-bottom: 1.5rem;
    color: var(--text);
}

.form-group {
    margin-bottom: 1.25rem;
    position: relative;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--gray-200);
    border-radius: 0.5rem;
    font-family: 'Inter', sans-serif;
    font-size: 0.875rem;
    transition: border-color 0.2s;
    background: var(--gray-200);
    color: var(--text);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
}

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

.form-group input[type="color"] {
    height: 50px;
    cursor: pointer;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.btn-generate-text {
    margin-top: 0.5rem;
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    font-size: 0.875rem;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

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

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

/* ===== Preview Panel ===== */
.preview-panel {
    background: var(--gray-100);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 2rem;
    height: fit-content;
    border: 1px solid var(--gray-200);
}

.preview-panel h3 {
    margin-bottom: 1.5rem;
}

.ad-preview {
    background: var(--gray-200);
    border-radius: 0.5rem;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    overflow: hidden;
    position: relative;
}

.ad-preview canvas {
    max-width: 100%;
    max-height: 600px;
    border-radius: 0.5rem;
}

.preview-placeholder {
    text-align: center;
    color: var(--gray-400);
}

.preview-placeholder i {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.preview-actions {
    display: flex;
    gap: 1rem;
}

/* ===== Buttons ===== */
.btn {
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    justify-content: center;
    font-family: 'Inter', sans-serif;
    flex: 1;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--gray-200);
    color: var(--text);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--gray-300);
}

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

.btn-success:hover:not(:disabled) {
    background: #059669;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-info:hover:not(:disabled) {
    background: #0891B2;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-danger:hover:not(:disabled) {
    background: #DC2626;
}

/* ===== Gallery Page ===== */
.gallery-filters {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.gallery-filters input,
.gallery-filters select {
    padding: 0.75rem 1rem;
    border: 2px solid var(--gray-200);
    border-radius: 0.5rem;
    font-family: 'Inter', sans-serif;
    font-size: 0.875rem;
    background: var(--gray-100);
    color: var(--text);
}

.gallery-filters input {
    flex: 1;
}

.gallery-filters select {
    min-width: 200px;
}

/* ===== Brand Kit Page ===== */
.brand-kit-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.brand-form,
.brand-list {
    background: var(--gray-100);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
}

.brand-form h3,
.brand-list h3 {
    margin-bottom: 1.5rem;
}

.brand-card {
    background: var(--gray-200);
    padding: 1.5rem;
    border-radius: 0.75rem;
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand-colors {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.color-swatch {
    width: 30px;
    height: 30px;
    border-radius: 0.25rem;
    border: 2px solid var(--white);
    box-shadow: var(--shadow-sm);
}

.brand-card h4 {
    margin-bottom: 0.25rem;
}

.brand-card p {
    font-size: 0.875rem;
    color: var(--gray-500);
}

.brand-card-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-icon {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.btn-icon-edit {
    background: var(--gray-200);
    color: var(--text);
}

.btn-icon-edit:hover {
    background: var(--gray-300);
}

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

.btn-icon-delete:hover {
    background: #DC2626;
}

/* ===== Templates Page ===== */
.templates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
}

.template-card {
    background: var(--gray-100);
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid var(--gray-200);
}

.template-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.template-preview {
    width: 100%;
    height: 200px;
    background: var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: center;
}

.template-demo {
    width: 120px;
    height: 120px;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 2.5rem;
}

.template-card h4 {
    padding: 1rem 1rem 0.25rem;
}

.template-card p {
    padding: 0 1rem;
    color: var(--gray-500);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.btn-use-template {
    width: 100%;
    padding: 0.75rem;
    background: var(--primary);
    color: var(--white);
    border: none;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
}

.btn-use-template:hover {
    background: var(--secondary);
}

/* ===== Toast Notification ===== */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--gray-900);
    color: var(--white);
    padding: 1rem 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow-xl);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s;
    z-index: 9999;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    max-width: 400px;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.toast.success {
    background: var(--success);
}

.toast.error {
    background: var(--danger);
}

.toast.info {
    background: var(--accent);
}

/* ===== Loading Overlay ===== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    backdrop-filter: blur(4px);
}

.loading-overlay.show {
    display: flex;
}

.loading-spinner {
    text-align: center;
    color: var(--white);
}

.loading-spinner i {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.loading-spinner p {
    font-size: 1.125rem;
    font-weight: 600;
}

/* ===== Responsive Design ===== */
@media (max-width: 1200px) {
    .create-container,
    .brand-kit-container {
        grid-template-columns: 1fr;
    }
    
    .preview-panel {
        position: relative;
        top: 0;
    }
}

@media (max-width: 768px) {
    :root {
        --sidebar-width: 0;
    }
    
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s;
    }
    
    .sidebar.mobile-open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
        padding: 1rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .action-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .creative-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
    
    .gallery-filters {
        flex-direction: column;
    }
    
    .gallery-filters select {
        width: 100%;
    }
}

@media (max-width: 480px) {
    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.25rem; }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .action-grid {
        grid-template-columns: 1fr;
    }
    
    .creative-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}