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

:root {
    --primary-color: #ff6b35;
    --secondary-color: #004e89;
    --dark-bg: #1a1a2e;
    --light-bg: #f8f9fa;
    --text-dark: #2d3436;
    --text-light: #636e72;
    --border-color: #e1e8ed;
    --success-color: #00b894;
    --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

html {
    scroll-behavior: smooth;
}

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

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

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    z-index: 1000;
    padding: 1rem 0;
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
}

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

.version {
    font-size: 0.75rem;
    background: var(--light-bg);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    color: var(--text-light);
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

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

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

.lang-switch {
    border-left: 1px solid var(--border-color);
    padding-left: 1rem;
}

.lang-switch a {
    padding: 0.4rem 0.8rem;
    background: var(--light-bg);
    border-radius: 4px;
    font-size: 0.9rem;
    transition: opacity 0.3s;
    display: none; /* Hide all buttons by default */
}

/* Show button when it has active class */
.lang-switch a.active {
    display: inline-block;
}

/* Hero Section */
.hero {
    padding: 150px 0 100px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    opacity: 0.95;
    font-weight: 300;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 4rem;
}

.btn {
    padding: 0.9rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    display: inline-block;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.2);
}

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

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

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

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

.hero-stats {
    display: flex;
    gap: 3rem;
    justify-content: center;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-label {
    opacity: 0.9;
    font-size: 0.95rem;
}

/* Features Section */
.features {
    padding: 100px 0;
    background: var(--light-bg);
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    font-weight: 700;
}

.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: 0 4px 20px rgba(0,0,0,0.08);
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}

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

.feature-card h3 {
    font-size: 1.4rem;
    margin-bottom: 0.8rem;
    color: var(--secondary-color);
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.7;
}

/* Quick Start Section */
.quickstart {
    padding: 100px 0;
    background: white;
}

.quickstart h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    font-weight: 700;
}

.quickstart-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.quickstart-step {
    text-align: center;
    padding: 2rem;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--gradient);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    font-weight: 700;
    margin: 0 auto 1.5rem;
}

.quickstart-step h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.quickstart-step p {
    color: var(--text-light);
    margin-bottom: 1rem;
}

.code-block {
    background: var(--dark-bg);
    color: #fff;
    padding: 1rem;
    border-radius: 8px;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    overflow-x: auto;
    text-align: left;
    margin-top: 1rem;
}

.code-block code {
    white-space: pre;
}

/* Download Section */
.download {
    padding: 100px 0;
    background: var(--light-bg);
}

.download h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

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

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.download-card {
    background: white;
    padding: 2.5rem 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    text-align: center;
}

.platform-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.download-card h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--secondary-color);
}

.platform-options {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.download-link {
    padding: 0.7rem 1.2rem;
    background: var(--gradient);
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
    transition: all 0.3s;
    display: block;
}

.download-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.download-link.secondary {
    background: var(--light-bg);
    color: var(--secondary-color);
}

.download-link.secondary:hover {
    background: var(--secondary-color);
    color: white;
}

.download-footer {
    text-align: center;
}

/* Footer */
.footer {
    background: var(--dark-bg);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.footer-section p {
    color: rgba(255,255,255,0.8);
    line-height: 1.8;
}

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

/* Responsive */
@media (max-width: 768px) {
    .nav .container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }

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

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .hero-stats {
        gap: 2rem;
    }

    .stat-value {
        font-size: 2rem;
    }

    .features h2,
    .quickstart h2,
    .download h2 {
        font-size: 2rem;
    }

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

@media (max-width: 480px) {
    .hero {
        padding: 120px 0 80px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .btn {
        padding: 0.7rem 1.5rem;
        font-size: 0.9rem;
    }
}