/* ============================================
   Context Pilot — Landing Page Styles
   Dark theme. Clean. Professional. Developer-first.
   ============================================ */

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

:root {
    --bg-primary: #0a0a12;
    --bg-secondary: #0f0f1a;
    --bg-card: #13131f;
    --bg-card-hover: #1a1a2e;
    --bg-terminal: #0d0d14;
    --border: #1e1e32;
    --border-light: #2a2a44;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-dim: #64748b;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --accent-glow: rgba(99, 102, 241, 0.15);
    --cyan: #22d3ee;
    --green: #34d399;
    --yellow: #fbbf24;
    --red: #f87171;
    --purple: #a78bfa;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --max-width: 1140px;
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

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

/* --- Navigation --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 10, 18, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.nav-logo-icon { font-size: 1.4rem; }

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}

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

/* --- Hero --- */
.hero {
    padding: 160px 0 80px;
    text-align: center;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 600px;
    background: radial-gradient(ellipse, var(--accent-glow) 0%, transparent 70%);
    pointer-events: none;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    border: 1px solid var(--border-light);
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
    margin-bottom: 32px;
}

.hero-title {
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--accent) 0%, var(--cyan) 50%, var(--purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    line-height: 1.8;
    max-width: 600px;
    margin: 0 auto 40px;
}

.hero-cta { position: relative; z-index: 1; }

.install-block {
    display: inline-flex;
    align-items: center;
    background: var(--bg-terminal);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 16px;
    margin-bottom: 24px;
    max-width: 100%;
    overflow-x: auto;
}

.install-block-large { padding: 16px 20px; }

.install-cmd {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

.install-prompt { color: var(--green); margin-right: 8px; }

.copy-btn {
    background: none;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    padding: 4px 8px;
    margin-left: 12px;
    transition: color 0.2s;
    flex-shrink: 0;
}

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

.hero-buttons {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 600;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.3);
}

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

.btn-secondary:hover {
    color: var(--text-primary);
    border-color: var(--text-dim);
    transform: translateY(-1px);
}

/* --- Stats Bar --- */
.stats {
    padding: 48px 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
}

.stats-grid {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 48px;
}

.stat { text-align: center; }

.stat-number {
    display: block;
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text-primary);
    font-family: var(--font-mono);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 500;
}

.stat-divider {
    width: 1px;
    height: 48px;
    background: var(--border);
}

/* --- Section Shared --- */
.section-label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--accent);
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    max-width: 680px;
}

/* --- Problem → Solution --- */
.problem-solution {
    padding: 120px 0 80px;
    text-align: center;
}

.problem-solution .section-subtitle {
    margin: 0 auto 60px;
}

.problem-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.problem-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    text-align: left;
    transition: border-color 0.3s, transform 0.3s;
}

.problem-card:hover {
    border-color: var(--border-light);
    transform: translateY(-2px);
}

.problem-icon { font-size: 2rem; margin-bottom: 16px; }
.problem-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; }
.problem-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }

/* --- Solution --- */
.solution {
    padding: 80px 0;
    text-align: center;
}

.solution .section-subtitle { margin: 0 auto; }

/* --- Use Cases --- */
.use-cases { padding: 80px 0 120px; }

.use-case {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
    margin-bottom: 100px;
}

.use-case:last-child { margin-bottom: 0; }
.use-case-reverse { direction: rtl; }
.use-case-reverse > * { direction: ltr; }

.use-case-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--accent);
    margin-bottom: 12px;
}

.use-case-content h3 {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.01em;
}

.use-case-content p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.use-case-tools { display: flex; flex-wrap: wrap; gap: 8px; }

.tool-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--accent-glow);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 100px;
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--accent-hover);
    font-family: var(--font-mono);
}

/* --- Terminal Mockup --- */
.terminal {
    background: var(--bg-terminal);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.terminal-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid var(--border);
}

.terminal-dots { display: flex; gap: 6px; }
.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot-red { background: #ff5f57; }
.dot-yellow { background: #febc2e; }
.dot-green { background: #28c840; }

.terminal-title {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-dim);
}

.terminal-body {
    padding: 20px;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    line-height: 1.7;
    overflow-x: auto;
}

.terminal-body code { font-family: inherit; }
.t-dim { color: var(--text-dim); }
.t-blue { color: #60a5fa; }
.t-cyan { color: var(--cyan); }
.t-green { color: var(--green); }
.t-yellow { color: var(--yellow); }
.t-red { color: var(--red); }
.t-purple { color: var(--purple); }
.t-white { color: var(--text-primary); }

/* --- Bento Feature Grid --- */
.features {
    padding: 120px 0;
    text-align: center;
}

.features .section-title { margin-bottom: 60px; }

.bento-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    text-align: left;
}

.bento-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: border-color 0.3s, transform 0.3s;
}

.bento-card:hover {
    border-color: var(--border-light);
    transform: translateY(-2px);
}

.bento-large { grid-column: span 2; }
.bento-icon { font-size: 1.8rem; margin-bottom: 16px; }
.bento-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; }
.bento-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }

.bento-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 16px;
}

.bento-tags span {
    display: inline-block;
    padding: 3px 10px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.72rem;
    font-family: var(--font-mono);
    color: var(--text-dim);
}

/* --- How It Works --- */
.how-it-works {
    padding: 120px 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    text-align: center;
}

.how-it-works .section-title { margin-bottom: 60px; }

.steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    text-align: left;
}

.step {
    position: relative;
    padding: 28px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}

.step-number {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 800;
    color: var(--accent);
    opacity: 0.4;
    margin-bottom: 16px;
    display: block;
}

.step h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 12px; }

.step code {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--cyan);
    background: rgba(34, 211, 238, 0.06);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    white-space: nowrap;
    overflow-x: auto;
}

.step p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.5; }

/* --- Comparison Table --- */
.comparison {
    padding: 120px 0;
    text-align: center;
}

.comparison .section-subtitle {
    margin: 0 auto 60px;
}

.comparison-table-wrapper {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.comparison-table th, .comparison-table td {
    padding: 16px 20px;
    text-align: center;
    border-bottom: 1px solid var(--border);
}

.comparison-table thead th {
    background: var(--bg-secondary);
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.comparison-table th:first-child, .comparison-table td:first-child {
    text-align: left;
    font-weight: 500;
}

.comparison-table tbody tr:hover { background: rgba(255, 255, 255, 0.02); }
.comparison-table tbody tr:last-child td { border-bottom: none; }

.highlight-col {
    color: var(--accent) !important;
    font-weight: 700 !important;
}

.yes { color: var(--green); font-weight: 600; }
.no { color: var(--text-dim); }
.partial { color: var(--yellow); }

/* --- Architecture --- */
.architecture {
    padding: 120px 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    text-align: center;
}

.architecture .section-title { margin-bottom: 60px; }

.arch-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    text-align: left;
}

.arch-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.arch-item h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.arch-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* --- FAQ --- */
.faq {
    padding: 120px 0;
    text-align: center;
}

.faq .section-title { margin-bottom: 48px; }

.faq-list {
    max-width: 720px;
    margin: 0 auto;
    text-align: left;
}

.faq-item {
    border-bottom: 1px solid var(--border);
}

.faq-item summary {
    padding: 20px 0;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: color 0.2s;
}

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

.faq-item summary::after {
    content: '+';
    font-size: 1.4rem;
    font-weight: 400;
    color: var(--text-dim);
    transition: transform 0.3s;
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-item summary:hover { color: var(--accent-hover); }

.faq-item p {
    padding: 0 0 20px;
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.faq-item code {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--cyan);
    background: rgba(34, 211, 238, 0.08);
    padding: 2px 6px;
    border-radius: 4px;
}

/* --- Final CTA --- */
.final-cta {
    padding: 120px 0;
    text-align: center;
    position: relative;
}

.final-cta::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 400px;
    background: radial-gradient(ellipse, var(--accent-glow) 0%, transparent 70%);
    pointer-events: none;
}

.final-cta .section-title { margin-bottom: 16px; }
.final-cta .section-subtitle { margin: 0 auto 40px; }

/* --- Footer --- */
.footer {
    padding: 64px 0 32px;
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-brand span { font-weight: 700; font-size: 1.1rem; }
.footer-tagline { color: var(--text-dim); font-size: 0.9rem; }

.footer-links h4 {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-dim);
    margin-bottom: 16px;
}

.footer-links a {
    display: block;
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding: 4px 0;
    transition: color 0.2s;
}

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

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.85rem;
    color: var(--text-dim);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .use-case { grid-template-columns: 1fr; gap: 40px; }
    .use-case-reverse { direction: ltr; }
    .bento-grid { grid-template-columns: repeat(2, 1fr); }
    .bento-large { grid-column: span 2; }
    .steps { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
    .nav-links { display: none; } /* TODO: mobile menu */
    .hero { padding: 120px 0 60px; }
    .hero-subtitle br { display: none; }
    .problem-cards { grid-template-columns: 1fr; }
    .bento-grid { grid-template-columns: 1fr; }
    .bento-large { grid-column: span 1; }
    .steps { grid-template-columns: 1fr; }
    .stats-grid { flex-wrap: wrap; gap: 24px; }
    .stat-divider { display: none; }
    .comparison-table { font-size: 0.8rem; }
    .comparison-table th, .comparison-table td { padding: 10px 12px; }
    .arch-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .install-block { max-width: 100%; }
    .install-cmd { font-size: 0.72rem; }
}

@media (max-width: 480px) {
    .hero-title { font-size: 2.5rem; }
    .section-title { font-size: 1.8rem; }
    .hero-buttons { flex-direction: column; width: 100%; }
    .btn { width: 100%; justify-content: center; }
}