:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent: #58a6ff;
    --accent-green: #3fb950;
    --border: #30363d;
}

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

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(13, 17, 23, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.logo {
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.logo:hover {
    color: var(--accent);
}

.site-header nav {
    display: flex;
    align-items: center;
    gap: 24px;
}

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

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

.nav-home {
    color: var(--accent);
}

.nav-home:hover {
    color: var(--accent-green);
}

/* Hero Section */
.hero {
    padding: 140px 0 80px;
    text-align: center;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.tagline {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.install-box {
    display: inline-flex;
    align-items: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 16px;
    gap: 12px;
}

.install-box code {
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.95rem;
    color: var(--accent-green);
}

.copy-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    transition: color 0.2s;
}

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

.copy-btn svg {
    width: 18px;
    height: 18px;
}

.copy-btn .hidden {
    display: none;
}

.copy-btn.copied .icon-copy {
    display: none;
}

.copy-btn.copied .icon-check {
    display: block;
    color: var(--accent-green);
}

/* Problem Section */
.problem {
    padding: 60px 0;
    text-align: center;
}

.problem-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 2;
    font-style: italic;
}

/* Terminal Demo */
.demo {
    padding: 40px 0 80px;
}

.terminal {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4);
}

.terminal-header {
    background: var(--bg-tertiary);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.terminal-dot.red { background: #ff5f56; }
.terminal-dot.yellow { background: #ffbd2e; }
.terminal-dot.green { background: #27c93f; }

.terminal-title {
    margin-left: auto;
    margin-right: auto;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.terminal-body {
    padding: 24px;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.9rem;
    min-height: 280px;
    position: relative;
}

.terminal-body pre {
    margin: 0;
    white-space: pre-wrap;
}

.cursor {
    display: inline-block;
    width: 8px;
    height: 18px;
    background: var(--text-primary);
    animation: blink 1s step-end infinite;
    vertical-align: text-bottom;
}

@keyframes blink {
    50% { opacity: 0; }
}

.prompt { color: var(--accent-green); }
.command { color: var(--text-primary); }
.output { color: var(--text-secondary); }
.highlight { color: var(--accent); }
.selected { color: var(--accent-green); }

/* Features Section */
.features {
    padding: 80px 0;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 32px 24px;
    text-align: center;
    transition: border-color 0.2s;
}

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

.feature-card h3 {
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    color: var(--accent);
    margin-bottom: 16px;
}

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.feature-card code {
    display: inline-block;
    background: var(--bg-primary);
    padding: 8px 16px;
    border-radius: 6px;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.85rem;
    color: var(--accent-green);
}

/* Installation Section */
.installation {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.installation h2 {
    text-align: center;
    margin-bottom: 32px;
    font-size: 1.75rem;
}

.tabs {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 24px;
}

.tab {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 10px 24px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
}

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

.tab.active {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--bg-primary);
}

.tab-content {
    display: none;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 24px;
    max-width: 600px;
    margin: 0 auto;
}

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

.tab-content pre {
    margin: 0;
}

.tab-content code {
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.9rem;
    line-height: 1.8;
}

.tab-content .comment {
    color: var(--text-secondary);
}

/* Workflow Section */
.workflow {
    padding: 80px 0;
}

.workflow h2 {
    text-align: center;
    margin-bottom: 48px;
    font-size: 1.75rem;
}

.workflow-steps {
    display: flex;
    flex-direction: column;
    gap: 24px;
    max-width: 600px;
    margin: 0 auto;
}

.workflow-step {
    display: flex;
    align-items: flex-start;
    gap: 20px;
}

.step-number {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    background: var(--accent);
    color: var(--bg-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
}

.step-content {
    flex: 1;
}

.step-content p {
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.step-content code {
    display: inline-block;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    padding: 8px 16px;
    border-radius: 6px;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.85rem;
    color: var(--accent-green);
}

/* Footer */
footer {
    padding: 48px 0;
    text-align: center;
    border-top: 1px solid var(--border);
}

.footer-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 16px;
}

.footer-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.footer-link:hover {
    color: var(--accent);
}

.footer-divider {
    color: var(--border);
}

.license {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 600px) {
    .header-content {
        height: 52px;
    }

    .site-header nav {
        gap: 16px;
    }

    .nav-link {
        font-size: 0.85rem;
    }

    .hero {
        padding: 100px 0 60px;
    }

    .install-box {
        flex-direction: column;
        width: 100%;
        max-width: 320px;
    }

    .terminal-body {
        font-size: 0.8rem;
        padding: 16px;
        min-height: 240px;
    }

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

    .workflow-step {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}