/* =============================================================================
   RAPPsquare Design System
   ============================================================================= */

:root {
    /* Colors - Dark Theme (Default) */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --bg-card: #16161f;
    --bg-hover: #1f1f2a;

    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #606070;

    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);

    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;

    --border-color: #2a2a35;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f0f1f3;
    --bg-card: #ffffff;
    --bg-hover: #e9ecef;

    --text-primary: #1a1a2e;
    --text-secondary: #4a4a5a;
    --text-muted: #8a8a9a;

    --border-color: #e0e0e5;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
}

/* =============================================================================
   Reset & Base
   ============================================================================= */

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

html {
    scroll-behavior: smooth;
}

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

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

a:hover {
    color: var(--accent-secondary);
}

/* =============================================================================
   Typography
   ============================================================================= */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
}

h1 { font-size: 3rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-title {
    font-size: 2rem;
    text-align: center;
    margin-bottom: var(--space-2xl);
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

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

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

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

.btn-lg {
    padding: var(--space-md) var(--space-xl);
    font-size: 1.1rem;
}

/* =============================================================================
   Navigation
   ============================================================================= */

.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-xl);
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.nav-brand {
    display: flex;
    align-items: baseline;
    gap: var(--space-md);
}

.nav-brand .logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-brand .logo sup {
    font-size: 0.8rem;
}

.nav-brand .tagline {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.nav-links {
    display: flex;
    gap: var(--space-xs);
}

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

.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.nav-link.active {
    color: var(--accent-primary);
}

.nav-actions {
    display: flex;
    gap: var(--space-sm);
}

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

.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    padding: 120px var(--space-xl) var(--space-3xl);
    min-height: 100vh;
    align-items: center;
}

.hero-title {
    font-size: 5rem;
    font-weight: 800;
    margin-bottom: var(--space-md);
}

.hero-title .squared {
    font-size: 2rem;
    vertical-align: super;
    color: var(--accent-secondary);
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

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

.hero-actions {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
}

.hero-stats {
    display: flex;
    gap: var(--space-2xl);
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Platform Grid */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(3, 120px);
    grid-template-rows: repeat(3, 120px);
    gap: var(--space-md);
}

.platform-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.platform-card i {
    font-size: 2rem;
    color: var(--accent-primary);
}

.platform-card span {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.platform-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.platform-card.center {
    grid-column: 2;
    grid-row: 2;
    background: var(--accent-gradient);
    border: none;
}

.platform-card.center i,
.platform-card.center span {
    color: white;
}

.platform-card[data-platform="marketplace"] { grid-column: 1; grid-row: 1; }
.platform-card[data-platform="rappbook"] { grid-column: 3; grid-row: 1; }
.platform-card[data-platform="cards"] { grid-column: 1; grid-row: 3; }
.platform-card[data-platform="rappverse"] { grid-column: 3; grid-row: 3; }

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

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    padding: var(--space-xl);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-normal);
}

.feature-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
}

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-gradient);
    border-radius: var(--border-radius);
    margin-bottom: var(--space-md);
}

.feature-icon i {
    font-size: 1.5rem;
    color: white;
}

.feature-card h3 {
    margin-bottom: var(--space-sm);
}

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.feature-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 500;
}

.feature-link i {
    transition: transform var(--transition-fast);
}

.feature-link:hover i {
    transform: translateX(4px);
}

/* =============================================================================
   Live Feed Section
   ============================================================================= */

.live-feed {
    padding: var(--space-3xl) var(--space-xl);
}

.feed-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.feed-column h3 {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
}

.feed-items {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.feed-item {
    padding: var(--space-md);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
}

.feed-item:hover {
    border-color: var(--accent-primary);
}

.feed-item-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.feed-item-avatar {
    width: 32px;
    height: 32px;
    background: var(--accent-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    color: white;
}

.feed-item-meta {
    flex: 1;
}

.feed-item-author {
    font-weight: 500;
    font-size: 0.9rem;
}

.feed-item-time {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.feed-item-content {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* =============================================================================
   Quick Start Section
   ============================================================================= */

.quick-start {
    padding: var(--space-3xl) var(--space-xl);
    background: var(--bg-secondary);
}

.quick-start-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    max-width: 1000px;
    margin: 0 auto var(--space-xl);
}

.quick-start-card {
    padding: var(--space-xl);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    text-align: center;
}

.step-number {
    width: 40px;
    height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-gradient);
    border-radius: 50%;
    font-weight: 700;
    color: white;
    margin-bottom: var(--space-md);
}

.quick-start-card h3 {
    margin-bottom: var(--space-md);
}

.quick-start-card pre {
    background: var(--bg-primary);
    padding: var(--space-md);
    border-radius: var(--border-radius-sm);
    overflow-x: auto;
}

.quick-start-card code {
    font-family: 'Fira Code', 'Monaco', monospace;
    font-size: 0.85rem;
    color: var(--accent-primary);
}

.quick-start-cta {
    text-align: center;
}

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

.main-footer {
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    padding: var(--space-3xl) var(--space-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.footer-brand .logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.footer-brand p {
    color: var(--text-muted);
    margin-top: var(--space-sm);
}

.footer-links {
    display: flex;
    gap: var(--space-3xl);
}

.footer-column h4 {
    color: var(--text-primary);
    margin-bottom: var(--space-md);
    font-size: 0.9rem;
}

.footer-column a {
    display: block;
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding: var(--space-xs) 0;
}

.footer-column a:hover {
    color: var(--accent-primary);
}

.footer-bottom {
    text-align: center;
    padding: var(--space-lg);
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-bottom i {
    color: var(--error);
}

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

@media (max-width: 1024px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-description {
        margin: 0 auto var(--space-xl);
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-visual {
        display: none;
    }

    .feed-container {
        grid-template-columns: 1fr;
    }

    .quick-start-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .main-nav {
        flex-wrap: wrap;
        gap: var(--space-md);
    }

    .nav-links {
        order: 3;
        width: 100%;
        justify-content: center;
        overflow-x: auto;
    }

    .nav-link span {
        display: none;
    }

    .hero-title {
        font-size: 3rem;
    }

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

    .footer-content {
        flex-direction: column;
        gap: var(--space-xl);
    }

    .footer-links {
        flex-wrap: wrap;
        gap: var(--space-xl);
    }
}

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

.hidden { display: none !important; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }

/* Loading States */
.skeleton {
    background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-hover) 50%, var(--bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

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

.fade-in {
    animation: fadeIn 0.4s ease forwards;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}