:root {
    --bg: #fafaf7;
    --bg-alt: #f0ede6;
    --text: #1a1a1a;
    --text-soft: #555;
    --accent: #2a5d4e;
    --accent-soft: #e8f0ed;
    --border: #e0ddd4;
    --radius: 6px;
    --max-width: 760px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #151513;
        --bg-alt: #1f1e1b;
        --text: #ebe8e0;
        --text-soft: #a8a59a;
        --accent: #84c9b4;
        --accent-soft: #1d2f2a;
        --border: #2a2a26;
    }
}

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

html { font-size: 17px; }
body {
    font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
    line-height: 1.6;
    background: var(--bg);
    color: var(--text);
    -webkit-font-smoothing: antialiased;
}

header {
    border-bottom: 1px solid var(--border);
    background: var(--bg);
    position: sticky; top: 0; z-index: 10;
}
nav {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo { font-weight: 600; color: var(--text); text-decoration: none; font-size: 1.05rem; }
.nav-links a {
    color: var(--text-soft);
    text-decoration: none;
    margin-left: 1.5rem;
    font-size: 0.95rem;
}
.nav-links a:hover { color: var(--text); }

main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 3rem 1.5rem;
}

section { margin-bottom: 4rem; }

h1 { font-size: 2rem; line-height: 1.2; margin-bottom: 1rem; font-weight: 600; }
h2 { font-size: 1.3rem; margin-bottom: 1rem; margin-top: 2rem; font-weight: 600; }
p { margin-bottom: 1rem; color: var(--text); }
.lead { font-size: 1.15rem; color: var(--text-soft); }

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

.hero { padding: 2rem 0 1rem; }

.concept-grid {
    display: grid;
    gap: 1.25rem;
    grid-template-columns: 1fr;
}
@media (min-width: 640px) {
    .concept-grid { grid-template-columns: 1fr 1fr; }
}

.concept-card {
    display: block;
    padding: 1.5rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    text-decoration: none;
    color: var(--text);
    transition: transform 0.15s ease, border-color 0.15s ease;
}
.concept-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}
.concept-card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; font-weight: 600; }
.concept-card p { font-size: 0.95rem; color: var(--text-soft); margin-bottom: 0.75rem; }
.concept-card .stage {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent);
    font-weight: 600;
}

/* concept page */
.breadcrumb { margin-bottom: 2rem; font-size: 0.9rem; }
.breadcrumb a { text-decoration: none; color: var(--text-soft); }

.concept-header { margin-bottom: 2rem; }
.concept-stage {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: 3px;
    margin-bottom: 1rem;
    font-weight: 600;
}
.concept-tagline { font-size: 1.2rem; color: var(--text-soft); margin-top: 0.5rem; }

.concept-body {
    font-size: 1.05rem;
    line-height: 1.7;
    margin: 2rem 0;
}
.concept-body h2 { font-size: 1.2rem; margin-top: 2rem; }
.concept-body h3 { font-size: 1.05rem; margin-top: 1.5rem; font-weight: 600; }
.concept-body ul, .concept-body ol { margin: 1rem 0 1rem 1.5rem; }
.concept-body li { margin-bottom: 0.35rem; }
.concept-body blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 1rem;
    margin: 1.5rem 0;
    color: var(--text-soft);
    font-style: italic;
}

.pricing-block {
    background: var(--bg-alt);
    padding: 1.5rem;
    border-radius: var(--radius);
    margin: 2rem 0;
}
.pricing-block h3 { margin-bottom: 0.5rem; }
.pricing-block .price { font-size: 1.3rem; font-weight: 600; color: var(--accent); }
.pricing-block .price-note { font-size: 0.9rem; color: var(--text-soft); }

.concept-cta {
    padding: 2rem 0;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    margin: 3rem 0;
    text-align: center;
}
.cta-buttons { display: flex; gap: 0.75rem; justify-content: center; margin-top: 1rem; flex-wrap: wrap; }
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: opacity 0.15s;
}
.btn:hover { opacity: 0.85; }
.btn-primary { background: var(--accent); color: var(--bg); }
.btn-secondary { border: 1px solid var(--border); color: var(--text); }

.concept-meta dl {
    display: grid;
    grid-template-columns: max-content 1fr;
    gap: 0.5rem 1.5rem;
    font-size: 0.85rem;
    color: var(--text-soft);
    margin-top: 2rem;
}
.concept-meta dt { font-weight: 600; }

.about ul { margin: 1rem 0 1rem 1.5rem; }
.about li { margin-bottom: 0.5rem; }

/* Forms (lead capture + subscribe) */
.lead-form, .subscribe-form {
    display: grid;
    gap: 1rem;
    margin: 1.5rem auto 0.5rem;
    max-width: 480px;
    text-align: left;
}
.lead-form label, .subscribe-form label {
    display: grid;
    gap: 0.35rem;
}
.lead-form label span, .subscribe-form label span {
    font-size: 0.85rem;
    color: var(--text-soft);
    font-weight: 500;
}
.lead-form input[type="text"],
.lead-form input[type="email"],
.lead-form textarea,
.subscribe-form input[type="email"] {
    padding: 0.7rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg);
    color: var(--text);
    font-family: inherit;
    font-size: 0.95rem;
    width: 100%;
}
.lead-form input:focus,
.lead-form textarea:focus,
.subscribe-form input:focus {
    outline: none;
    border-color: var(--accent);
}
.lead-form textarea { resize: vertical; min-height: 5rem; }

.form-note {
    font-size: 0.8rem;
    color: var(--text-soft);
    margin-top: -0.5rem;
}

.form-success, .subscribe-success {
    padding: 1rem;
    background: var(--accent-soft);
    color: var(--accent);
    border-radius: var(--radius);
    margin-top: 1rem;
    font-weight: 500;
}

/* Stripe CTA block */
.stripe-cta {
    margin: 2rem 0;
    padding: 1.5rem;
    border: 2px solid var(--accent);
    border-radius: var(--radius);
    text-align: center;
}
.stripe-cta h3 { color: var(--accent); margin-bottom: 0.5rem; }
.stripe-cta .btn-primary { margin-top: 0.75rem; }
.stripe-cta .price-note { font-size: 0.85rem; color: var(--text-soft); margin-top: 0.5rem; }

footer {
    border-top: 1px solid var(--border);
    padding: 2rem 1.5rem;
    text-align: center;
    color: var(--text-soft);
    font-size: 0.9rem;
}
footer a { color: var(--text-soft); }