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

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    background: var(--bg-white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 6rem 0;
    text-align: center;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

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

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

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

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

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

.btn-outline:hover {
    background: var(--primary-color);
    color: var(--bg-white);
}

/* Sections */
section {
    padding: 4rem 0;
}

section:nth-child(even) {
    background: var(--bg-light);
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--text-color);
}

h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

/* Ecosystem Section */
.ecosystem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.ecosystem-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
}

.ecosystem-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Categories Section */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.category-card {
    background: var(--bg-white);
    border-radius: 0.5rem;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.category-image img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.category-content {
    padding: 1.5rem;
}

.category-content h3 a {
    color: var(--text-color);
    text-decoration: none;
}

.category-content h3 a:hover {
    color: var(--primary-color);
}

.category-link {
    display: inline-block;
    margin-top: 1rem;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.category-link:hover {
    text-decoration: underline;
}

/* Mechanics Section */
.mechanics-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
    align-items: center;
}

.mechanics-visual {
    background: var(--bg-light);
    border-radius: 0.5rem;
    padding: 3rem;
    text-align: center;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.wheel-placeholder {
    font-size: 1.25rem;
    color: var(--text-light);
}

.mechanics-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.detail-item {
    background: var(--bg-white);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
}

.detail-item h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.mechanics-link {
    text-align: center;
}

/* Guide Section */
.guide-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.step {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
    position: relative;
}

.step-number {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.guide-cta {
    text-align: center;
    margin-top: 3rem;
}

/* Fairness Section */
.fairness-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-top: 2rem;
}

.fairness-principles ul,
.fairness-technical ul {
    list-style: none;
    margin-top: 1rem;
}

.fairness-principles li,
.fairness-technical li {
    padding: 0.75rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.fairness-principles li::before,
.fairness-technical li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 700;
}

/* Engagement Section */
.engagement-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.engagement-item {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
}

.engagement-item h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* FAQ Section */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
    margin-top: 2rem;
}

.faq-item {
    background: var(--bg-white);
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
}

.faq-item h3 {
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

/* Trust Section */
.trust-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.trust-item {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
}

.trust-item h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Footer */
.footer {
    background: var(--text-color);
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    color: white;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
}

.footer-bottom a:hover {
    color: white;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-menu {
        flex-direction: column;
        gap: 1rem;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .mechanics-content {
        grid-template-columns: 1fr;
    }
    
    .fairness-content {
        grid-template-columns: 1fr;
    }
    
    h2 {
        font-size: 2rem;
    }
}