/* StereoWipe Design System - Base Styles */
/* Version 2.0 - Unified Dark Theme */

/* ===== CSS VARIABLES ===== */
:root {
    /* Background Colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a24;
    --bg-hover: #22222e;
    
    /* Text Colors */
    --text-primary: #f4f4f8;
    --text-secondary: #a8a8b8;
    --text-muted: #7a7a8c;
    
    /* Border & Accent */
    --border-color: #2a2a3a;
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    
    /* Status Colors */
    --gold: #fbbf24;
    --silver: #94a3b8;
    --bronze: #d97706;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    
    /* Gradients */
    --gradient-1: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-2: linear-gradient(135deg, #0ea5e9 0%, #6366f1 100%);
    --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
}

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

/* ===== TYPOGRAPHY ===== */
body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

h1 { font-size: 36px; }
h2 { font-size: 28px; }
h3 { font-size: 22px; }
h4 { font-size: 18px; }

p {
    color: var(--text-secondary);
    line-height: 1.7;
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* ===== NAVIGATION ===== */
.nav {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    font-weight: 700;
    font-size: 20px;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: color 0.2s;
    padding: 8px 0;
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-1);
    border-radius: 1px;
}

/* ===== MAIN CONTAINER ===== */
.main-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 48px 40px 64px;
}

/* ===== PAGE HEADER ===== */
.page-header {
    margin-bottom: 48px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border-color);
}

.page-header h1 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
    color: var(--text-primary);
}

.page-header p {
    color: var(--text-secondary);
    font-size: 17px;
    max-width: 680px;
    line-height: 1.7;
}

/* ===== HERO SECTION ===== */
.hero {
    background: var(--gradient-hero);
    padding: 80px 40px;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #fff 0%, #a8a8b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== BUTTONS ===== */
.btn {
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 600;
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient-1);
    color: white;
}

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    color: white;
}

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

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

/* ===== CARDS ===== */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    transition: border-color 0.2s ease;
}

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

.card h3 {
    color: var(--text-primary);
    margin-bottom: 12px;
}

.card p {
    color: var(--text-secondary);
    font-size: 15px;
}

/* ===== GRID LAYOUTS ===== */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

/* ===== SECTIONS ===== */
.section {
    padding: 64px 0;
}

.section-title {
    font-size: 28px;
    color: var(--text-primary);
    margin-bottom: 16px;
    text-align: center;
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 48px;
    text-align: center;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== FEATURE CARDS ===== */
.feature-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
    text-align: center;
    transition: all 0.2s ease;
}

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

.feature-icon {
    width: 56px;
    height: 56px;
    background: var(--bg-tertiary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 24px;
}

.feature-card h3 {
    color: var(--text-primary);
    margin-bottom: 12px;
    font-size: 18px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
}

/* ===== STEPS ===== */
.steps-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 32px;
}

.step {
    text-align: center;
}

.step-number {
    width: 48px;
    height: 48px;
    background: var(--gradient-1);
    color: white;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 700;
    margin: 0 auto 16px;
}

.step h4 {
    color: var(--text-primary);
    margin-bottom: 8px;
}

.step p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 48px 40px;
    margin-top: 64px;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 24px;
}

.footer p {
    color: var(--text-muted);
    font-size: 14px;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 14px;
}

.footer-links a:hover {
    color: var(--text-primary);
}

/* ===== CONTENT SECTIONS ===== */
.content-section {
    max-width: 800px;
    margin: 0 auto;
}

.content-section p {
    margin-bottom: 24px;
    font-size: 16px;
    line-height: 1.8;
}

.content-section ul,
.content-section ol {
    margin-bottom: 24px;
    padding-left: 24px;
}

.content-section li {
    color: var(--text-secondary);
    margin-bottom: 12px;
    line-height: 1.7;
}

.content-section strong {
    color: var(--text-primary);
}

/* ===== HIGHLIGHT BOX ===== */
.highlight-box {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-left: 3px solid var(--accent-primary);
    border-radius: 8px;
    padding: 24px;
    margin: 32px 0;
}

.highlight-box h3 {
    color: var(--text-primary);
    margin-bottom: 16px;
    font-size: 18px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .main-container {
        padding: 32px 20px 48px;
    }
    
    .hero {
        padding: 60px 20px;
    }
    
    .hero h1 {
        font-size: 32px;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .page-header h1 {
        font-size: 28px;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}