/* ===== Global Styles ===== */
:root {
    --primary-color: #4A90E2;
    --secondary-color: #50C878;
    --accent-color: #FF6B6B;
    --dark-bg: #1a1a2e;
    --darker-bg: #16161e;
    --light-bg: #f8f9fa;
    --text-primary: #333;
    --text-secondary: #666;
    --text-light: #fff;
    --border-color: #e0e0e0;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.2);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    overflow-x: hidden;
}

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

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

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-light);
    text-decoration: none;
}

.logo a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-light);
    text-decoration: none;
}

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

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

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

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

.demo-link {
    background: var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: 5px;
}

.demo-link:hover {
    background: #3a7bc8;
    color: var(--text-light) !important;
}

.github-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, var(--dark-bg) 0%, var(--darker-bg) 100%);
    color: var(--text-light);
    padding: 6rem 0;
    min-height: 80vh;
    display: flex;
    align-items: center;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.highlight {
    color: var(--primary-color);
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    color: #ccc;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--text-light);
}

.btn-primary:hover {
    background: #3a7bc8;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

.hero-stats {
    display: flex;
    gap: 3rem;
    margin-top: 3rem;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.9rem;
    color: #ccc;
}

/* Hero Compass Preview */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.compass-preview {
    width: 300px;
    height: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.compass-circle {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(74, 144, 226, 0.2) 0%, rgba(74, 144, 226, 0.05) 70%);
    border: 3px solid var(--primary-color);
    position: relative;
    animation: pulse 2s ease-in-out infinite;
}

.compass-needle {
    position: absolute;
    width: 4px;
    height: 100px;
    background: linear-gradient(to top, var(--accent-color), transparent);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -100%);
    transform-origin: bottom center;
    animation: rotate 4s linear infinite;
}

.compass-direction {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.9; }
}

@keyframes rotate {
    from { transform: translate(-50%, -100%) rotate(0deg); }
    to { transform: translate(-50%, -100%) rotate(360deg); }
}

/* ===== Features Section ===== */
.features {
    padding: 6rem 0;
    background: var(--light-bg);
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 1rem;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--dark-bg);
}

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

/* ===== How It Works Section ===== */
.how-it-works {
    padding: 6rem 0;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.step {
    display: flex;
    gap: 1rem;
}

.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: bold;
    flex-shrink: 0;
}

.step-content h3 {
    margin-bottom: 0.5rem;
    color: var(--dark-bg);
}

.step-content p {
    color: var(--text-secondary);
}

.tech-stack {
    text-align: center;
    margin-top: 3rem;
}

.tech-stack h3 {
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

.tech-tag {
    background: var(--dark-bg);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
}

/* ===== Demo Section ===== */
.demo-section {
    padding: 6rem 0;
    background: var(--light-bg);
}

.demo-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.demo-features li {
    margin: 0.5rem 0;
    color: var(--text-secondary);
}

.browser-mockup {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.browser-bar {
    background: #e0e0e0;
    padding: 0.75rem;
    display: flex;
    align-items: center;
}

.browser-dots {
    display: flex;
    gap: 0.5rem;
}

.browser-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #999;
}

.browser-content {
    padding: 2rem;
    background: var(--dark-bg);
    height: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.demo-compass-large {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(74, 144, 226, 0.3) 0%, rgba(74, 144, 226, 0.1) 70%);
    border: 3px solid var(--primary-color);
    animation: pulse 2s ease-in-out infinite;
}

/* ===== Hardware Section ===== */
.hardware {
    padding: 6rem 0;
}

.hardware-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.hardware-item {
    display: flex;
    gap: 1rem;
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.hardware-icon {
    font-size: 2.5rem;
}

.hardware-details h3 {
    margin-bottom: 0.25rem;
    color: var(--dark-bg);
}

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

.price {
    display: inline-block;
    margin-top: 0.5rem;
    color: var(--secondary-color);
    font-weight: bold;
}

.hardware-total {
    text-align: center;
    margin: 2rem 0;
    padding: 2rem;
    background: var(--light-bg);
    border-radius: 8px;
}

.hardware-total p {
    font-size: 1.25rem;
    margin: 0.5rem 0;
}

.hardware-total strong {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.hardware-note {
    color: var(--text-secondary);
    font-size: 0.9rem !important;
}

/* ===== Use Cases Section ===== */
.use-cases {
    padding: 6rem 0;
    background: var(--light-bg);
}

.use-case-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.use-case-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-align: center;
}

.use-case-emoji {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.use-case-card h3 {
    margin-bottom: 0.5rem;
    color: var(--dark-bg);
}

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

/* ===== CTA Section ===== */
.cta-section {
    padding: 6rem 0;
    background: linear-gradient(135deg, var(--dark-bg) 0%, var(--darker-bg) 100%);
    color: var(--text-light);
    text-align: center;
}

.cta-section h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta-section p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: #ccc;
}

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

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

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

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

.footer-section ul li {
    margin: 0.5rem 0;
}

.footer-section a {
    color: #ccc;
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 1rem;
    text-align: center;
    color: #999;
}

.footer-bottom p {
    margin: 0.25rem 0;
}

/* ===== Demo Page Styles ===== */
.demo-page {
    background: var(--light-bg);
    min-height: 100vh;
}

.demo-container {
    padding: 3rem 0;
}

.demo-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 0.5rem;
    color: var(--dark-bg);
}

.demo-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

.demo-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
}

.demo-main {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.compass-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

#compassCanvas {
    max-width: 100%;
    height: auto;
    border-radius: 50%;
}

.compass-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    width: 100%;
}

.info-item {
    background: var(--light-bg);
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
}

.info-label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.info-value {
    display: block;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.demo-controls {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.control-section {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.control-section h3 {
    margin-bottom: 0.5rem;
    color: var(--dark-bg);
}

.control-hint {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.control-group {
    margin: 1rem 0;
}

.control-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark-bg);
}

.control-group input[type="range"] {
    width: 100%;
    margin-bottom: 0.25rem;
}

.range-value {
    display: inline-block;
    background: var(--light-bg);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-weight: bold;
    color: var(--primary-color);
}

.gps-group {
    margin: 1rem 0;
}

.gps-group h4 {
    margin-bottom: 0.5rem;
    color: var(--dark-bg);
}

.input-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.input-row input {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.9rem;
}

.preset-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 1rem;
}

.btn-preset {
    padding: 0.5rem;
    background: var(--light-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 0.85rem;
}

.btn-preset:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.algorithm-info {
    background: var(--light-bg);
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1rem;
}

.algorithm-info p {
    font-size: 0.85rem;
    margin: 0.25rem 0;
    color: var(--text-secondary);
}

.wasm-badge {
    margin-top: 1rem;
    padding: 0.5rem;
    background: var(--secondary-color);
    color: white;
    border-radius: 4px;
    text-align: center;
    font-weight: bold;
    font-size: 0.9rem;
}

.demo-features-note {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.demo-features-note h3 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--dark-bg);
}

.features-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.feature-note {
    text-align: center;
}

.feature-note strong {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

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

.demo-explanation {
    background: var(--light-bg);
    padding: 2rem;
    border-radius: 12px;
}

.demo-explanation h3 {
    margin-bottom: 1rem;
    color: var(--dark-bg);
}

.demo-explanation ol {
    margin-left: 1.5rem;
}

.demo-explanation li {
    margin: 0.75rem 0;
    color: var(--text-secondary);
}

.note {
    margin-top: 1rem;
    padding: 1rem;
    background: white;
    border-left: 4px solid var(--primary-color);
    font-style: italic;
    color: var(--text-secondary);
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    color: white;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .demo-content {
        grid-template-columns: 1fr;
    }
    
    .demo-layout {
        grid-template-columns: 1fr;
    }
    
    .nav-menu {
        gap: 1rem;
        flex-wrap: wrap;
    }
    
    .features-grid,
    .hardware-list,
    .use-case-cards {
        grid-template-columns: 1fr;
    }
}