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

:root {
    --primary-color: #000000;
    --secondary-color: #333333;
    --accent-color: #666666;
    --text-color: #ffffff;
    --text-muted: #cccccc;
    --background: #000000;
    --surface: #111111;
    --border: #333333;
    --success: #ffffff;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
}

body {
    font-family: var(--font-family);
    background: var(--background);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.nav-brand h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
}

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

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

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

.github-link {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    transition: all 0.3s ease;
}

.github-link:hover {
    background: var(--surface);
    border-color: var(--text-color);
}

/* Hero Section */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    min-height: 100vh;
    padding: 8rem 2rem 4rem;
    max-width: 1200px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #ffffff 0%, #cccccc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
    line-height: 1.6;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

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

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

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

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

/* Terminal Demo */
.terminal {
    background: #0a0a0a;
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.terminal-header {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    background: #1a1a1a;
    border-bottom: 1px solid var(--border);
}

.terminal-buttons {
    display: flex;
    gap: 0.5rem;
    margin-right: 1rem;
}

.terminal-buttons span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.btn-close { background: #ff5f57; }
.btn-minimize { background: #ffbd2e; }
.btn-maximize { background: #28ca42; }

.terminal-title {
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
}

.terminal-body {
    padding: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
}

.terminal-line {
    margin-bottom: 0.5rem;
}

.prompt {
    color: #00ff00;
    margin-right: 0.5rem;
}

.cursor {
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.success-message {
    color: var(--text-color);
    margin: 1rem 0;
    padding: 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    border-left: 3px solid var(--text-color);
}

.task-table {
    margin: 1rem 0;
}

.table-header {
    color: var(--text-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
    text-align: center;
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: 8px 8px 0 0;
}

.table-row {
    display: grid;
    grid-template-columns: auto auto auto 1fr auto;
    gap: 1rem;
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0 0 8px 8px;
    align-items: center;
}

.task-id { color: var(--text-muted); }
.task-status { color: var(--text-muted); }
.task-priority { color: var(--text-color); }
.task-desc { color: var(--text-color); }
.task-due { color: var(--text-color); }

/* Sections */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-color);
}

.features {
    padding: 6rem 0;
    background: var(--surface);
}

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

.feature-card {
    background: var(--background);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    text-align: center;
    transition: all 0.3s ease;
}

.feature-card:hover {
    border-color: var(--text-color);
    transform: translateY(-4px);
}

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

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-color);
}

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

.feature-card code {
    background: var(--surface);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-color);
}

/* Installation */
.installation {
    padding: 6rem 0;
}

.install-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.install-method {
    background: var(--surface);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border);
}

.install-method h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
    color: var(--text-color);
    text-align: center;
}

.install-method h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.install-note {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--text-color);
    text-align: center;
}

.install-note p {
    color: var(--text-muted);
    margin: 0;
}

.install-steps {
    display: grid;
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.step {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    background: var(--text-color);
    color: var(--background);
    border-radius: 50%;
    font-weight: 600;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.step-content pre {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    overflow-x: auto;
}

.step-content code {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-color);
}

/* Usage */
.usage {
    padding: 6rem 0;
    background: var(--surface);
}

.usage-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.usage-example {
    background: var(--background);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border);
}

.usage-example h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.usage-example pre {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    overflow-x: auto;
}

.command-reference {
    max-width: 800px;
    margin: 0 auto;
}

.command-reference h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--text-color);
}

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

.command-group {
    background: var(--background);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border);
}

.command-group h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.command-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.command-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem;
    background: var(--surface);
    border-radius: 6px;
}

.command-item code {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-color);
    background: transparent;
}

.command-item span:last-child {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Footer */
.footer {
    background: var(--surface);
    padding: 3rem 0 1rem;
    border-top: 1px solid var(--border);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 2rem;
    align-items: center;
    margin-bottom: 2rem;
}

.footer-info h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.footer-info p {
    color: var(--text-muted);
}

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

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

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
        padding: 6rem 1rem 4rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .nav {
        padding: 1rem;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .container {
        padding: 0 1rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .usage-grid {
        grid-template-columns: 1fr;
    }
    
    .commands-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .step {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}