:root {
    --bg-primary: #000000;
    --bg-card: #0a0a0a;
    --text-primary: #ffffff;
    --text-secondary: #888888;
    --text-muted: #555555;
    --border-color: #333333;
    --border-hover: #555555;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

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

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.logo-img {
    width: 28px;
    height: 28px;
}

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

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
    font-size: 0.9rem;
}

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

/* Hero Section */
.hero {
    padding: 140px 0 80px;
    background: var(--bg-primary);
}

.hero-content {
    text-align: left;
    max-width: 800px;
}

.hero-content h1 {
    font-size: 4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    letter-spacing: -2px;
    line-height: 1.1;
}

.bitcoin-symbol {
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-weight: 400;
}

.hero-description {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
    line-height: 1.7;
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.btn {
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 9999px;
    font-size: 0.85rem;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

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

.btn-primary:hover {
    border-color: var(--text-primary);
}

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

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

.btn-icon {
    font-size: 1rem;
}

.version-info {
    display: flex;
    gap: 1rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.version {
    color: var(--text-secondary);
}

/* Features Section */
.features {
    padding: 80px 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

.section-title {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 3rem;
    font-weight: 600;
    letter-spacing: -1px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1px;
    background: var(--border-color);
}

.feature-card {
    background: var(--bg-primary);
    padding: 2rem;
    transition: background 0.2s;
}

.feature-card:hover {
    background: var(--bg-card);
}

.feature-icon {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    opacity: 0.7;
}

.feature-card h3 {
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
    font-weight: 500;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* Modes Section */
.modes {
    padding: 80px 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

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

.mode-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 2rem;
    transition: border-color 0.2s;
}

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

.mode-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    opacity: 0.7;
}

.mode-card h3 {
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    font-size: 1.2rem;
    font-weight: 500;
}

.mode-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* Download Section */
.download {
    padding: 80px 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

.download-content {
    max-width: 500px;
}

.download-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 2.5rem;
    margin-bottom: 2rem;
}

.download-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

.download-card h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.download-details {
    display: flex;
    gap: 0.75rem;
    margin: 1.5rem 0;
    flex-wrap: wrap;
}

.detail-item {
    padding: 6px 14px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.btn-download {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 12px 28px;
    font-size: 0.9rem;
    border-radius: 9999px;
    text-decoration: none;
    display: inline-block;
    transition: all 0.2s;
}

.btn-download:hover {
    border-color: var(--text-primary);
}

.download-note {
    margin-top: 1rem;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.installation {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 2rem;
}

.installation h3 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    font-weight: 500;
    font-size: 1.1rem;
}

.installation ol {
    list-style: none;
    counter-reset: step;
}

.installation li {
    counter-increment: step;
    margin-bottom: 1rem;
    position: relative;
    padding-left: 2rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.installation li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 1.4rem;
    height: 1.4rem;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
}

/* Security Notice */
.security-notice {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 2rem;
    margin: 2rem 0;
}

.security-notice h3 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-weight: 500;
    font-size: 1.1rem;
}

.security-notice p {
    color: var(--text-muted);
    margin-bottom: 1rem;
    font-size: 0.9rem;
    line-height: 1.6;
}

.security-notice ol {
    list-style: none;
    counter-reset: security-step;
    margin-bottom: 1rem;
}

.security-notice li {
    counter-increment: security-step;
    margin-bottom: 0.75rem;
    position: relative;
    padding-left: 1.75rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.5;
}

.security-notice li::before {
    content: counter(security-step);
    position: absolute;
    left: 0;
    top: 0;
    width: 1.2rem;
    height: 1.2rem;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
}

.security-notice code {
    background: var(--bg-card);
    padding: 2px 6px;
    color: var(--text-secondary);
    font-family: 'SF Mono', 'Monaco', monospace;
    font-size: 0.85rem;
}

.security-note {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-style: italic;
}

/* Screenshots */
.screenshots {
    padding: 80px 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

.screenshot-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1px;
    background: var(--border-color);
}

.screenshot-card {
    background: var(--bg-primary);
    overflow: hidden;
}

.screenshot-placeholder {
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Footer */
.footer {
    padding: 40px 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.footer-icon {
    width: 20px;
    height: 20px;
    opacity: 0.7;
}

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

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.85rem;
    transition: color 0.2s;
}

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

.footer-info {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* Remove all cyberpunk elements */
.cyber-grid,
.cyber-bg,
.cyber-line,
.cyber-lines,
.glitch,
.glitch::before,
.glitch::after {
    display: none !important;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2.5rem;
    }

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

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

    .mode-cards {
        grid-template-columns: 1fr;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: flex-start;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .navbar {
        padding: 0.75rem 0;
    }

    .nav-links {
        gap: 1rem;
        font-size: 0.85rem;
    }
}