:root {
    --ink: #1a1a1a;
    --paper: #fafaf9;
    --accent: #c45a2d;
    --accent-dark: #a34820;
    --muted: #6b6b6b;
    --border: #e5e5e3;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--ink);
    background: var(--paper);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Nav */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1100px;
    margin: 0 auto;
    padding: 1.5rem 2rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--ink);
    text-decoration: none;
}

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

nav a.cta-link {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
}

nav a.cta-link:hover { text-decoration: underline; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.85rem 2rem;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: background 0.2s;
}

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

.btn-primary:hover { background: var(--accent-dark); }

.btn-secondary {
    background: transparent;
    color: var(--ink);
    border: 1.5px solid var(--border);
}

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

/* Section labels */
.section-label {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    font-weight: 700;
}

.section-title {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-top: 0.5rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    color: var(--muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--border);
}

/* Stack page styles */
.stack-hero {
    max-width: 1100px;
    margin: 0 auto;
    padding: 4rem 2rem 3rem;
}

.stack-hero .breadcrumb {
    font-size: 0.85rem;
    color: var(--muted);
    margin-bottom: 1.5rem;
}

.stack-hero .breadcrumb a {
    color: var(--accent);
    text-decoration: none;
}

.stack-hero .breadcrumb a:hover { text-decoration: underline; }

.stack-hero h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    max-width: 700px;
}

.stack-hero h1 .highlight { color: var(--accent); }

.stack-hero .subtitle {
    margin-top: 1rem;
    font-size: 1.15rem;
    color: var(--muted);
    max-width: 600px;
    line-height: 1.5;
}

/* Comparison section */
.comparison {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem 4rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.compare-card {
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border);
}

.compare-card.before { border-color: #fecaca; }
.compare-card.after { border-color: #bbf7d0; }

.compare-card .card-header {
    padding: 1rem 1.5rem;
    font-weight: 700;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.compare-card.before .card-header {
    background: #fef2f2;
    color: #dc2626;
}

.compare-card.after .card-header {
    background: #f0fdf4;
    color: #16a34a;
}

.compare-card .card-img {
    width: 100%;
    aspect-ratio: 16/10;
    object-fit: cover;
    display: block;
    background: #eee;
}

.compare-card .card-body {
    padding: 1.5rem;
}

.compare-card .card-body h3 {
    font-size: 1.1rem;
    font-weight: 700;
}

.compare-card .card-body p {
    margin-top: 0.5rem;
    color: var(--muted);
    font-size: 0.95rem;
}

/* Feature list */
.features {
    max-width: 1100px;
    margin: 0 auto;
    padding: 3rem 2rem 4rem;
}

.features h2 {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 2rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.feature {
    padding: 1.5rem;
    border: 1px solid var(--border);
    border-radius: 8px;
}

.feature-icon {
    width: 36px;
    height: 36px;
    min-width: 36px;
    max-width: 36px;
    margin-bottom: 0.75rem;
}

.feature h3 {
    font-size: 1rem;
    font-weight: 700;
}

.feature p {
    margin-top: 0.5rem;
    color: var(--muted);
    font-size: 0.9rem;
}

/* CTA banner */
.stack-cta {
    text-align: center;
    padding: 4rem 2rem;
    background: #f4f3f1;
}

.stack-cta h2 {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.stack-cta p {
    margin-top: 0.75rem;
    color: var(--muted);
    font-size: 1.05rem;
}

.stack-cta .btn { margin-top: 1.5rem; }

/* Responsive */
@media (max-width: 768px) {
    .comparison {
        grid-template-columns: 1fr;
    }
}