/* ========================================
   CSS Variables - Spatially.dev Inspired Theme
   ======================================== */

:root {
    /* Dark Mode Colors */
    --primary-bg: #0f172a;
    --secondary-bg: #1e293b;
    --accent-cyan: #0891b2;
    --accent-amber: #f59e0b;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --border-color: rgba(8, 145, 178, 0.2);
    --card-bg: #1e293b;
    --code-bg: #0f172a;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #06b6d4, #0891b2);
    --gradient-card: linear-gradient(135deg, rgba(6, 182, 212, 0.1), rgba(8, 145, 178, 0.1));

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Typography */
    --font-system: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-mono: 'Monaco', 'Menlo', 'Courier New', monospace;

    /* Transitions */
    --transition: all 0.3s ease;
}

[data-theme="light"] {
    --primary-bg: #f8fafc;
    --secondary-bg: #ffffff;
    --accent-cyan: #0891b2;
    --accent-amber: #d97706;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --border-color: rgba(8, 145, 178, 0.3);
    --card-bg: #ffffff;
    --code-bg: #f1f5f9;
}

/* ========================================
   Global Styles
   ======================================== */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-system);
    background-color: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ========================================
   Header
   ======================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

[data-theme="light"] .header {
    background: rgba(248, 250, 252, 0.8);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
}

.logo-icon {
    font-size: 2rem;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.nav a:hover {
    color: var(--accent-cyan);
}

.theme-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition);
}

.theme-toggle:hover {
    border-color: var(--accent-cyan);
    transform: scale(1.05);
}

.download-btn {
    background: var(--gradient-primary);
    color: white;
    border: none;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: var(--transition);
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(8, 145, 178, 0.3);
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
    margin-top: 5rem;
    padding: var(--spacing-3xl) 0;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.75rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xl);
    font-weight: 500;
    line-height: 1.4;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-decoration: none;
    display: inline-block;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(8, 145, 178, 0.3);
}

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

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

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.125rem;
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-xl);
}

.stat {
    text-align: left;
}

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent-cyan);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Code Preview */
.code-preview {
    background: var(--code-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.code-header {
    background: rgba(8, 145, 178, 0.1);
    padding: var(--spacing-sm);
    display: flex;
    gap: var(--spacing-xs);
}

.code-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-secondary);
}

.code-preview pre {
    padding: var(--spacing-lg);
    overflow-x: auto;
}

.code-preview code {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.8;
    color: var(--text-primary);
}

.code-comment { color: #64748b; }
.code-keyword { color: #0891b2; font-weight: 600; }
.code-string { color: #f59e0b; }
.code-success { color: #10b981; }

/* ========================================
   Features Section
   ======================================== */

.features {
    padding: var(--spacing-3xl) 0;
    background: var(--secondary-bg);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    background: var(--card-bg);
    padding: var(--spacing-lg);
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-cyan);
    box-shadow: 0 15px 40px rgba(8, 145, 178, 0.2);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========================================
   Editions Section
   ======================================== */

.editions {
    padding: var(--spacing-3xl) 0;
}

.editions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    max-width: 900px;
    margin: 0 auto;
}

.edition-card {
    background: var(--card-bg);
    padding: var(--spacing-xl);
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    position: relative;
    transition: var(--transition);
}

.edition-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 50px rgba(8, 145, 178, 0.2);
}

.edition-featured {
    border: 2px solid var(--accent-cyan);
    background: var(--gradient-card);
}

.edition-badge {
    display: inline-block;
    background: var(--gradient-primary);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
}

.edition-price {
    margin-bottom: var(--spacing-lg);
}

.price {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent-cyan);
    display: block;
}

.price-detail {
    color: var(--text-secondary);
    font-size: 1rem;
}

.edition-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.edition-features {
    list-style: none;
    margin-bottom: var(--spacing-lg);
}

.edition-features li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
}

.edition-btn {
    width: 100%;
}

/* ========================================
   Use Cases Section
   ======================================== */

.use-cases {
    padding: var(--spacing-3xl) 0;
    background: var(--secondary-bg);
}

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

.use-case {
    text-align: center;
    padding: var(--spacing-lg);
}

.use-case-icon {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
}

.use-case h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.use-case p {
    color: var(--text-secondary);
}

/* ========================================
   CTA Section
   ======================================== */

.cta {
    padding: var(--spacing-3xl) 0;
    text-align: center;
}

.cta-content {
    background: var(--gradient-card);
    padding: var(--spacing-2xl);
    border-radius: 1rem;
    border: 1px solid var(--border-color);
}

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

.cta p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

/* ========================================
   Footer
   ======================================== */

.footer {
    background: var(--secondary-bg);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.25rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
}

.footer-section h4 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: var(--spacing-xs);
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--accent-cyan);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ========================================
   Modal
   ======================================== */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
}

.modal-content {
    position: relative;
    background: var(--card-bg);
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.5);
}

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

.modal-header h3 {
    font-size: 1.5rem;
}

.modal-close {
    background: transparent;
    border: none;
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    line-height: 1;
    padding: 0;
    width: 2rem;
    height: 2rem;
}

.modal-close:hover {
    color: var(--accent-cyan);
    transform: rotate(90deg);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-subtitle {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.download-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.download-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--primary-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    transition: var(--transition);
}

.download-option:hover {
    border-color: var(--accent-cyan);
}

.download-option-icon {
    font-size: 2.5rem;
}

.download-option-content {
    flex: 1;
}

.download-option h4 {
    margin-bottom: 0.25rem;
}

.download-option p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.download-note {
    background: var(--gradient-card);
    padding: var(--spacing-lg);
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
}

.download-note p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

.email-signup {
    display: flex;
    gap: var(--spacing-sm);
}

.email-input {
    flex: 1;
    padding: var(--spacing-sm);
    background: var(--primary-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    color: var(--text-primary);
    font-size: 1rem;
}

.email-input:focus {
    outline: none;
    border-color: var(--accent-cyan);
}

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

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

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero-stats {
        gap: var(--spacing-md);
    }

    .nav {
        gap: var(--spacing-sm);
    }

    .nav a {
        display: none;
    }

    .cta-buttons {
        flex-direction: column;
    }

    .editions-grid {
        grid-template-columns: 1fr;
    }

    .email-signup {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }
}

/* ========================================
   Animations
   ======================================== */

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.hero-visual {
    animation: float 6s ease-in-out infinite;
}

/* Disabled button styles */
button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

button:disabled:hover {
    transform: none;
    box-shadow: none;
}