/* Base Styles & Variables */
:root {
    /* Primary Colors */
    --primary: #9C27B0;
    --primary-light: #BA68C8;
    --primary-dark: #7B1FA2;
    --secondary: #673AB7;
    --secondary-light: #9575CD;
    --secondary-dark: #512DA8;
    
    /* Background Colors */
    --bg-primary: #121212;
    --bg-secondary: #1A1A1A;
    --bg-tertiary: #242424;
    --bg-accent: rgba(156, 39, 176, 0.1);
    
    /* Text Colors */
    --text-primary: #FFFFFF;
    --text-secondary: rgba(255, 255, 255, 0.8);
    --text-tertiary: rgba(255, 255, 255, 0.6);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 24px;
    
    /* Shadows */
    --shadow-sm: 0 2px 5px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 10px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 20px rgba(0, 0, 0, 0.4);
    
    /* Animation */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Layout */
    --sidebar-width: 250px;
    --header-height: 60px;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

button,
input,
textarea {
    font-family: inherit;
    font-size: inherit;
}

/* App Shell Layout */
.app-shell {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    grid-template-rows: 1fr;
    min-height: 100vh;
    position: relative;
}

/* Sidebar */
.sidebar {
    background-color: var(--bg-secondary);
    height: 100vh;
    position: fixed;
    width: var(--sidebar-width);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform var(--transition-medium);
    overflow-y: auto;
}

.logo-container {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.logo {
    width: 40px;
    height: 40px;
    margin-right: var(--spacing-md);
}

.site-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin: 0;
}

.site-title span {
    color: var(--primary);
}

/* Main Navigation */
.main-nav {
    margin-top: var(--spacing-lg);
    flex: 1;
}

.main-nav ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.nav-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.nav-item:hover {
    background-color: var(--bg-accent);
    color: var(--text-primary);
}

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

.nav-cta {
    margin-top: var(--spacing-lg);
}

.btn-cta {
    display: block;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    text-align: center;
    font-weight: 600;
    transition: all var(--transition-fast);
}

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

/* Theme Toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: var(--spacing-xl);
    padding: var(--spacing-md) 0;
}

.toggle-track {
    width: 50px;
    height: 24px;
    background-color: var(--bg-tertiary);
    border-radius: 12px;
    position: relative;
    margin: 0 var(--spacing-md);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.toggle-thumb {
    position: absolute;
    left: 2px;
    top: 2px;
    width: 20px;
    height: 20px;
    background-color: white;
    border-radius: 50%;
    transition: transform var(--transition-fast);
}

.toggle-icon {
    width: 16px;
    height: 16px;
    opacity: 0.7;
}

body.dark-mode .toggle-thumb {
    transform: translateX(26px);
}

body.dark-mode .toggle-track {
    background-color: var(--primary);
}

/* Mobile Header */
.mobile-header {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--bg-secondary);
    padding: 0 var(--spacing-lg);
    align-items: center;
    justify-content: space-between;
    z-index: 90;
    box-shadow: var(--shadow-sm);
}

.mobile-logo {
    display: flex;
    align-items: center;
}

.logo-small {
    width: 30px;
    height: 30px;
    margin-right: var(--spacing-sm);
}

.mobile-title {
    font-size: 1rem;
    font-weight: 700;
}

.mobile-title span {
    color: var(--primary);
}

.menu-toggle {
    background: none;
    border: none;
    width: 30px;
    height: 20px;
    position: relative;
    cursor: pointer;
    z-index: 110;
}

.menu-toggle span {
    display: block;
    position: absolute;
    height: 2px;
    width: 100%;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.menu-toggle span:nth-child(1) {
    top: 0;
}

.menu-toggle span:nth-child(2) {
    top: 9px;
}

.menu-toggle span:nth-child(3) {
    bottom: 0;
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg);
    top: 9px;
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg);
    bottom: 9px;
}

/* Main Content */
.main-content {
    grid-column: 2 / -1;
    min-height: 100vh;
}

/* Section Containers */
.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

/* Section Titles */
.section-title {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.section-title span {
    color: var(--primary);
    position: relative;
}

.section-title span::after {
    content: "";
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--primary);
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

/* Hero Section */
.hero-section {
    padding: var(--spacing-xxl) 0;
}

.hero-section .section-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-title {
    font-size: 3rem;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
}

.hero-title span {
    color: var(--primary);
}

.hero-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    font-size: 1.1rem;
    max-width: 500px;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-graphic {
    width: 100%;
    max-width: 400px;
}

.ai-art {
    animation: pulse 3s infinite alternate;
}

@keyframes pulse {
    0% {
        opacity: 0.8;
    }
    100% {
        opacity: 1;
    }
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
}

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

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

.btn-secondary:hover {
    background-color: var(--bg-accent);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xxl);
    font-size: 1.1rem;
}

/* Create Section */
.create-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--bg-secondary);
}

.creation-interface {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: var(--spacing-xl);
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.options-panel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.panel-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.panel-section h3 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.option-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.option-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-secondary);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.option-btn:hover {
    background-color: var(--bg-accent);
    color: var(--text-primary);
}

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

.option-slider {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

input[type="range"] {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 3px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: white;
    border-radius: 50%;
    cursor: pointer;
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

.preview-panel {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.input-area {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.input-area label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.input-area textarea {
    height: 100px;
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border: 1px solid var(--bg-tertiary);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    resize: none;
}

.input-area textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.preview-container {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    overflow: hidden;
    aspect-ratio: 3/2;
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-placeholder {
    width: 100%;
    height: 100%;
}

.action-buttons {
    display: flex;
    justify-content: center;
}

/* Features Section */
.features-section {
    padding: var(--spacing-xxl) 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: transform var(--transition-fast);
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-lg);
}

.feature-card h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* CTA Section */
.cta-section {
    padding: var(--spacing-xxl) 0;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary) 100%);
}

.cta-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    color: white;
}

.cta-content h2 span {
    position: relative;
}

.cta-content h2 span::after {
    content: "";
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: white;
}

.cta-content p {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-xl);
    font-size: 1.1rem;
}

/* Footer */
.site-footer {
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
    background-color: var(--bg-secondary);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.footer-brand {
    display: flex;
    align-items: center;
}

.footer-logo {
    width: 36px;
    height: 36px;
    margin-right: var(--spacing-md);
}

.footer-name {
    font-weight: bold;
    margin-bottom: var(--spacing-xs);
}

.footer-tagline {
    color: var(--text-tertiary);
    font-size: 0.8rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-xl);
}

.link-group h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.link-group ul li {
    margin-bottom: var(--spacing-sm);
}

.link-group ul li a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

.link-group ul li a:hover {
    color: var(--primary);
}

.copyright {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.8rem;
}

/* Responsive Design */
@media screen and (max-width: 992px) {
    .app-shell {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .mobile-header {
        display: flex;
    }
    
    .main-content {
        grid-column: 1;
        padding-top: var(--header-height);
    }
    
    .hero-section .section-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .hero-content {
        text-align: center;
    }
    
    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .creation-interface {
        grid-template-columns: 1fr;
    }
    
    .options-panel {
        order: 2;
    }
    
    .preview-panel {
        order: 1;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
}

@media screen and (max-width: 576px) {
    .section-container {
        padding: var(--spacing-lg);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .cta-content h2 {
        font-size: 1.8rem;
    }
    
    .btn {
        padding: var(--spacing-sm) var(--spacing-lg);
    }
    
    .hero-actions {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
}