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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #2d3748;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

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

/* Header Styles */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-img {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 18px;
}

.logo-img::before {
    content: "GM";
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: #4a5568;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: #667eea;
    background: rgba(102, 126, 234, 0.1);
}

/* Main Layout */
.main {
    margin-top: 80px;
    min-height: calc(100vh - 80px);
}

.layout {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 2rem;
    padding: 2rem 0;
}

/* Sidebar Styles */
.sidebar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 2rem;
    height: fit-content;
    position: sticky;
    top: 100px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.sidebar-menu {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 1rem;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.menu-item:hover {
    background: rgba(102, 126, 234, 0.05);
    transform: translateX(4px);
}

.menu-item.active {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.3);
}

.menu-icon {
    font-size: 1.5rem;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.2);
}

.menu-item.active .menu-icon {
    background: rgba(255, 255, 255, 0.2);
}

/* Content Styles */
.content {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 3rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.content-section {
    display: none;
}

.content-section.active {
    display: block;
}

.section-header {
    margin-bottom: 3rem;
    text-align: center;
}

.section-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.2rem;
    color: #718096;
    font-weight: 400;
}

/* Hero Banner */
.hero-banner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    margin-bottom: 4rem;
    padding: 2rem;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
    border-radius: 16px;
    border: 1px solid rgba(102, 126, 234, 0.1);
}

.hero-content h2 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #2d3748;
}

.hero-content p {
    font-size: 1.1rem;
    color: #718096;
    margin-bottom: 2rem;
    line-height: 1.8;
}

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

.btn {
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 500;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: transparent;
    color: #667eea;
    border: 2px solid #667eea;
}

.btn-secondary:hover {
    background: #667eea;
    color: white;
}

/* Security Illustration */
.security-illustration {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.shield-icon {
    font-size: 4rem;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 4px 8px rgba(102, 126, 234, 0.3));
}

.data-flow {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.data-node {
    font-size: 2rem;
    padding: 1rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.tunnel-line {
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 2px;
    position: relative;
    overflow: hidden;
}

.tunnel-line::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.8), transparent);
    animation: flow 2s infinite;
}

@keyframes flow {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    padding: 2rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    border: 1px solid rgba(102, 126, 234, 0.1);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #2d3748;
}

.feature-card p {
    color: #718096;
    line-height: 1.6;
}

/* Usage Guide */
.usage-content {
    max-width: 800px;
    margin: 0 auto;
}

.step-guide {
    margin-bottom: 3rem;
}

.step {
    display: flex;
    gap: 2rem;
    margin-bottom: 3rem;
    align-items: flex-start;
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 600;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #2d3748;
}

.step-content p {
    color: #718096;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.code-block {
    background: #1a202c;
    color: #e2e8f0;
    padding: 1.5rem;
    border-radius: 8px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9rem;
    line-height: 1.4;
    overflow-x: auto;
    margin-top: 1rem;
}

.code-block code {
    background: none;
    padding: 0;
    color: inherit;
}

.usage-tips {
    background: rgba(102, 126, 234, 0.05);
    padding: 2rem;
    border-radius: 12px;
    border-left: 4px solid #667eea;
}

.usage-tips h3 {
    color: #2d3748;
    margin-bottom: 1rem;
}

.usage-tips ul {
    list-style: none;
    padding-left: 0;
}

.usage-tips li {
    padding: 0.5rem 0;
    color: #718096;
    position: relative;
    padding-left: 2rem;
}

.usage-tips li::before {
    content: "💡";
    position: absolute;
    left: 0;
    top: 0.5rem;
}

/* Download Section */
.download-content {
    max-width: 900px;
    margin: 0 auto;
}

.version-info {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 3rem;
    border: 1px solid rgba(102, 126, 234, 0.1);
}

.current-version h2 {
    color: #2d3748;
    margin-bottom: 0.5rem;
}

.current-version p {
    color: #718096;
    margin-bottom: 1.5rem;
}

.version-highlights h4 {
    color: #2d3748;
    margin-bottom: 1rem;
}

.version-highlights ul {
    list-style: none;
    padding-left: 0;
}

.version-highlights li {
    padding: 0.5rem 0;
    color: #718096;
    position: relative;
    padding-left: 2rem;
}

.version-highlights li::before {
    content: "✨";
    position: absolute;
    left: 0;
    top: 0.5rem;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.download-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    border: 1px solid rgba(102, 126, 234, 0.1);
}

.download-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.os-icon {
    font-size: 3rem;
    text-align: center;
    margin-bottom: 1rem;
}

.download-card h3 {
    text-align: center;
    color: #2d3748;
    margin-bottom: 0.5rem;
    font-size: 1.5rem;
}

.download-card p {
    text-align: center;
    color: #718096;
    margin-bottom: 2rem;
}

.download-options {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.download-btn {
    display: block;
    padding: 1rem;
    background: rgba(102, 126, 234, 0.05);
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: 8px;
    text-decoration: none;
    color: #2d3748;
    transition: all 0.3s ease;
}

.download-btn:hover {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-color: transparent;
}

.download-btn span {
    display: block;
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.download-btn small {
    color: #718096;
    font-size: 0.85rem;
}

.download-btn:hover small {
    color: rgba(255, 255, 255, 0.8);
}

.sha256-info {
    background: rgba(102, 126, 234, 0.05);
    padding: 0.75rem;
    border-radius: 6px;
    border-left: 3px solid #667eea;
    word-break: break-all;
    overflow-wrap: break-word;
}

.sha256-info small {
    color: #4a5568;
    font-size: 0.8rem;
    line-height: 1.4;
}

.download-notes {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
}

.download-notes h3 {
    color: #2d3748;
    margin-bottom: 1.5rem;
    text-align: center;
}

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

.note-item h4 {
    color: #2d3748;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.note-item p {
    color: #718096;
    line-height: 1.6;
}

/* Contact Section */
.contact-content {
    max-width: 900px;
    margin: 0 auto;
}

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

.contact-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
    text-align: center;
    border: 1px solid rgba(102, 126, 234, 0.1);
}

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

.contact-card h3 {
    color: #2d3748;
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
}

.contact-info p {
    color: #718096;
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.contact-info strong {
    color: #2d3748;
}

/* Contact Form */
.contact-form {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
    margin-bottom: 3rem;
    border: 1px solid rgba(102, 126, 234, 0.1);
}

.contact-form h3 {
    color: #2d3748;
    margin-bottom: 2rem;
    text-align: center;
}

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

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

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    color: #2d3748;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 12px;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* Social Links */
.social-links {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
    text-align: center;
    border: 1px solid rgba(102, 126, 234, 0.1);
}

.social-links h3 {
    color: #2d3748;
    margin-bottom: 1.5rem;
}

.social-grid {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.social-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: #718096;
    transition: all 0.3s ease;
    padding: 1rem;
    border-radius: 8px;
}

.social-link:hover {
    color: #667eea;
    background: rgba(102, 126, 234, 0.05);
}

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

/* Footer */
.footer {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.footer-links {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: #718096;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #667eea;
}

.footer-copyright p {
    color: #718096;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .layout {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .sidebar {
        position: static;
        order: 2;
        margin-top: 2rem;
    }
    
    .sidebar-menu {
        flex-direction: row;
        overflow-x: auto;
        gap: 0.5rem;
    }
    
    .menu-item {
        flex-shrink: 0;
        min-width: 120px;
        flex-direction: column;
        text-align: center;
        padding: 1rem 0.5rem;
    }
    
    .hero-banner {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .social-grid {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .nav {
        display: none;
    }
    
    .section-header h1 {
        font-size: 2rem;
    }
    
    .hero-content h2 {
        font-size: 1.5rem;
    }
    
    .content {
        padding: 2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .content {
        padding: 1.5rem;
    }
    
    .section-header h1 {
        font-size: 1.75rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .download-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .notes-grid {
        grid-template-columns: 1fr;
    }
}