/* CSS Variables - Brown-black + Neon Green Theme */
:root {
    /* Brown-black backgrounds */
    --bg-primary: #0d0b09;
    --bg-secondary: #1a1612;
    --bg-tertiary: #252018;
    --bg-card: #1f1a14;
    --bg-terminal: #0a0908;

    /* Neon green accents */
    --accent-primary: #00ec97;
    --accent-secondary: #00d489;
    --accent-dim: #00a36c;
    --accent-glow: rgba(0, 236, 151, 0.3);

    /* Text colors */
    --text-primary: #e8e4df;
    --text-secondary: #a39e96;
    --text-muted: #6b6660;
    --text-code: #c9c5bf;

    /* Border colors */
    --border-primary: #3d352c;
    --border-secondary: #2a241e;
    --border-accent: var(--accent-dim);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

    /* Spacing */
    --container-max: 1200px;
    --section-padding: 6rem 2rem;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--accent-secondary);
}

code {
    font-family: var(--font-mono);
    background: var(--bg-tertiary);
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--accent-primary);
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(13, 11, 9, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-secondary);
}

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

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 1.2rem;
    color: var(--text-primary);
}

.logo-icon {
    color: var(--accent-primary);
    text-shadow: 0 0 10px var(--accent-glow);
}

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

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: color 0.2s ease;
}

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

/* Hero Section */
.hero {
    padding: 10rem 2rem 6rem;
    text-align: center;
    background:
        radial-gradient(ellipse at 50% 0%, rgba(0, 236, 151, 0.05) 0%, transparent 50%),
        var(--bg-primary);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.hero-title .highlight {
    color: var(--accent-primary);
    text-shadow: 0 0 30px var(--accent-glow);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 3rem;
}

/* Installation Tabs */
.install-section {
    margin-bottom: 2.5rem;
}

.install-tabs {
    display: flex;
    justify-content: center;
    gap: 0.25rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.install-tab {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    color: var(--text-secondary);
    padding: 0.5rem 0.9rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.2s ease;
    border-radius: 4px;
}

.install-tab:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

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

.install-content {
    background: var(--bg-terminal);
    border: 1px solid var(--border-primary);
    border-radius: 6px;
    padding: 1rem 1.5rem;
    max-width: 700px;
    margin: 0 auto;
}

.install-pane {
    display: none;
    align-items: center;
    gap: 1rem;
}

.install-pane.active {
    display: flex;
}

.install-pane code {
    background: transparent;
    color: var(--accent-primary);
    font-size: 0.95rem;
    padding: 0;
    flex: 1;
    text-align: left;
    word-break: break-all;
}

/* Copy Button */
.copy-btn {
    background: transparent;
    border: 1px solid var(--border-primary);
    border-radius: 4px;
    padding: 0.5rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: all 0.2s ease;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.copy-btn:hover {
    border-color: var(--accent-dim);
    color: var(--accent-primary);
}

.copy-btn svg {
    width: 16px;
    height: 16px;
}

.copy-btn .check-icon {
    display: none;
    color: var(--accent-primary);
}

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

.copy-btn.copied .check-icon {
    display: block;
}

/* CTA Buttons */
.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 4px;
    transition: all 0.2s ease;
    border: 1px solid transparent;
}

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

.btn-primary:hover {
    background: var(--accent-secondary);
    border-color: var(--accent-secondary);
    color: var(--bg-primary);
    box-shadow: 0 0 20px var(--accent-glow);
}

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

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

/* Terminal Demo */
.demo-section {
    padding: 0 2rem 6rem;
}

.terminal-window {
    max-width: 900px;
    margin: 0 auto;
    background: var(--bg-terminal);
    border-radius: 8px;
    border: 1px solid var(--border-primary);
    overflow: hidden;
    box-shadow:
        0 0 0 1px var(--border-secondary),
        0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

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

.terminal-buttons {
    display: flex;
    gap: 8px;
}

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

.terminal-btn.close { background: #ff5f57; }
.terminal-btn.minimize { background: #ffbd2e; }
.terminal-btn.maximize { background: #28c840; }

.terminal-title {
    flex: 1;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.terminal-body {
    padding: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    min-height: 350px;
    line-height: 1.3;
}

.terminal-prompt {
    color: var(--accent-primary);
}

.terminal-command {
    color: var(--text-primary);
}

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

.terminal-highlight {
    color: var(--accent-primary);
}

.terminal-dim {
    color: var(--text-muted);
}

.terminal-cursor {
    display: inline-block;
    width: 8px;
    height: 1.2em;
    background: var(--accent-primary);
    animation: blink 1s step-end infinite;
    vertical-align: text-bottom;
}

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

/* Features Section */
.features {
    padding: var(--section-padding);
    background: var(--bg-secondary);
}

.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

.features-grid {
    max-width: var(--container-max);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    padding: 2rem;
    transition: all 0.2s ease;
}

.feature-card:hover {
    border-color: var(--accent-dim);
    transform: translateY(-2px);
}

.feature-icon {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--accent-primary);
    text-shadow: 0 0 15px var(--accent-glow);
}

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

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

/* Commands Section */
.commands-section {
    padding: var(--section-padding);
}

.commands-grid {
    max-width: var(--container-max);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.command-card {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    overflow: hidden;
}

.command-header {
    background: var(--bg-terminal);
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-secondary);
    font-family: var(--font-mono);
}

.command-prompt {
    color: var(--accent-primary);
    margin-right: 0.5rem;
}

.command-name {
    color: var(--text-primary);
}

.command-list {
    padding: 1.25rem;
    list-style: none;
}

.command-list li {
    padding: 0.4rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    position: relative;
    padding-left: 1.25rem;
}

.command-list li::before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--accent-dim);
}

/* Interactive Demo Section */
.interactive-section {
    padding: var(--section-padding);
    background: var(--bg-secondary);
}

.demo-grid {
    max-width: var(--container-max);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.demo-card h3 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-weight: 500;
}

.mini-terminal {
    background: var(--bg-terminal);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    padding: 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

.term-line {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.term-prompt {
    color: var(--accent-primary);
}

.term-question {
    color: var(--text-primary);
}

.term-options {
    margin-left: 1rem;
    border-left: 2px solid #4a90d9;
    padding-left: 1rem;
}

.term-option {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
    padding: 0.3rem 0;
    color: var(--text-muted);
}

.term-option.selected {
    color: var(--text-primary);
}

.radio {
    display: inline-block;
    width: 10px;
    text-align: center;
}

.radio::before {
    content: "○";
}

.radio.filled::before {
    content: "●";
    color: var(--accent-primary);
}

.term-desc {
    color: var(--text-muted);
}

.term-option.selected .term-desc {
    color: var(--text-secondary);
}

.term-hint {
    margin-top: 1rem;
    margin-left: 1rem;
    color: #c9a227;
    font-size: 0.8rem;
}

/* Stats Section */
.stats-section {
    padding: 4rem 2rem;
    border-top: 1px solid var(--border-secondary);
    border-bottom: 1px solid var(--border-secondary);
}

.stats-grid {
    max-width: 800px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    text-align: center;
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-primary);
    text-shadow: 0 0 20px var(--accent-glow);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

/* FAQ Section */
.faq-section {
    padding: var(--section-padding);
}

.faq-list {
    max-width: 700px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: 6px;
    margin-bottom: 1rem;
    overflow: hidden;
}

.faq-item summary {
    padding: 1.25rem 1.5rem;
    cursor: pointer;
    font-weight: 500;
    color: var(--text-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    list-style: none;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: "+";
    font-size: 1.25rem;
    color: var(--accent-dim);
    transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
    content: "−";
}

.faq-item p {
    padding: 0 1.5rem 1.25rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    padding: 3rem 2rem;
    border-top: 1px solid var(--border-secondary);
}

.footer-content {
    max-width: var(--container-max);
    margin: 0 auto;
    text-align: center;
}

.footer-logo {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

.footer-copyright {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero {
        padding: 8rem 1.5rem 4rem;
    }

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

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

    .stats-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .terminal-body {
        font-size: 0.8rem;
        padding: 1rem;
    }
}