:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --secondary: #10b981;
    --dark: #0f172a;
    --light: #f8fafc;
    --slate: #64748b;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: system-ui, -apple-system, sans-serif; background-color: var(--light); background-image: linear-gradient(#e2e8f04d 1px, transparent 1px), linear-gradient(90deg, #e2e8f04d 1px, transparent 1px); background-size: 32px 32px; color: #334155; line-height: 1.6; }

header { background: #fff; border-bottom: 1px solid #e2e8f0; position: sticky; top: 0; z-index: 100; }
.nav-container { max-width: 1100px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 1rem 1.5rem; }
.logo { font-size: 1.5rem; font-weight: 800; color: var(--dark); text-decoration: none; display: flex; align-items: center; gap: 0.5rem; }
.logo span { color: var(--primary); }
.nav-links { display: flex; gap: 1rem; align-items: center; }
.nav-links a { text-decoration: none; font-weight: 600; font-size: 0.95rem; }
.btn-link { color: var(--slate); padding: 0.5rem 1rem; }
.btn-link:hover { color: var(--dark); }
.btn-primary { background: var(--primary); color: #fff; padding: 0.6rem 1.2rem; border-radius: 6px; transition: background 0.2s; }
.btn-primary:hover { background: var(--primary-hover); }

.hero { padding: 5rem 1.5rem 4rem; text-align: center; max-width: 900px; margin: 0 auto; }
.eyebrow { color: var(--primary); font-size: 0.8rem; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase; }
.hero h1 { font-size: 3rem; font-weight: 900; color: var(--dark); letter-spacing: -0.025em; line-height: 1.15; margin-bottom: 1.5rem; }
.hero > .eyebrow { margin-bottom: 1rem; }
.hero > p:not(.eyebrow) { font-size: 1.2rem; color: var(--slate); max-width: 700px; margin: 0 auto 2.5rem; }
.hero-cta { display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap; }
.btn-lg { padding: 0.85rem 2rem; font-size: 1.05rem; font-weight: 700; border-radius: 8px; text-decoration: none; }
.btn-publisher { background: var(--dark); color: #fff; }
.btn-publisher:hover { background: #1e293b; }
.btn-referrer { background: var(--primary); color: #fff; }
.btn-referrer:hover { background: var(--primary-hover); }
.hero-points { display: flex; justify-content: center; gap: 1rem 1.5rem; flex-wrap: wrap; margin-top: 2.25rem; color: var(--slate); font-size: 0.9rem; font-weight: 600; }
.hero-points span::before { color: var(--secondary); content: "•"; font-size: 1.15rem; margin-right: 0.4rem; }

.portal-section { padding: 4rem 1.5rem; background: #fff; border-top: 1px solid #e2e8f0; border-bottom: 1px solid #e2e8f0; }
.portal-container { max-width: 1100px; margin: 0 auto; display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 2rem; }
.portal-card { background: var(--light); border: 1px solid #e2e8f0; border-radius: 8px; padding: 2.5rem; display: flex; flex-direction: column; justify-content: space-between; }
.portal-card h2 { font-size: 1.75rem; color: var(--dark); margin-bottom: 1rem; }
.portal-card ul { list-style: none; margin: 1.5rem 0; }
.portal-card li { margin-bottom: 0.75rem; color: var(--slate); display: flex; align-items: center; gap: 0.5rem; }
.portal-card li::before { content: "✓"; color: var(--secondary); font-weight: bold; }

.workflow-section, .embed-section { max-width: 1100px; margin: 0 auto; padding: 5rem 1.5rem; }
.section-heading { max-width: 700px; margin: 0 auto 2.5rem; text-align: center; }
.section-heading .eyebrow { margin-bottom: 0.75rem; }
.section-heading h2, .platform-layout h2, .cta-section h2 { color: var(--dark); font-size: 2.25rem; line-height: 1.2; margin-bottom: 1rem; }
.section-heading > p:last-child, .section-copy { color: var(--slate); }
.workflow-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.workflow-step { border-top: 3px solid var(--primary); padding: 1.5rem 0.25rem 0; }
.step-number { color: var(--secondary); font-size: 0.85rem; font-weight: 800; letter-spacing: 0.08em; }
.workflow-step h3 { color: var(--dark); font-size: 1.25rem; margin: 0.5rem 0; }
.workflow-step p { color: var(--slate); }

.platform-section { background: #0f172a; color: #cbd5e1; padding: 5rem 1.5rem; }
.platform-layout { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: 4rem; margin: 0 auto; max-width: 1100px; }
.platform-layout h2 { color: #fff; margin-top: 0.75rem; }
.platform-section .eyebrow { color: #6ee7b7; }
.platform-section .section-copy { color: #cbd5e1; }
.text-link { color: #6ee7b7; display: inline-block; font-weight: 800; margin-top: 1.5rem; text-decoration: none; }
.feature-list { border-top: 1px solid #334155; }
.feature-list div { border-bottom: 1px solid #334155; padding: 1.2rem 0; }
.feature-list dt { color: #fff; font-weight: 800; }
.feature-list dd { color: #94a3b8; margin-top: 0.25rem; }

.embed-section { padding-bottom: 5rem; }
.code-sample { background: #172033; border: 1px solid #334155; border-radius: 8px; color: #e2e8f0; font-size: 0.9rem; line-height: 1.7; margin: 0 auto; max-width: 720px; overflow-x: auto; padding: 1.5rem; }
.cta-section { align-items: center; background: #fff; border-top: 1px solid #e2e8f0; display: flex; gap: 2rem; justify-content: space-between; padding: 4rem max(1.5rem, calc((100% - 1100px) / 2)); }
.cta-section .eyebrow { margin-bottom: 0.75rem; }
.cta-section h2 { margin: 0; max-width: 520px; }
.cta-actions { display: flex; flex-wrap: wrap; gap: 1rem; }

footer { padding: 3rem 1.5rem; text-align: center; color: var(--slate); font-size: 0.9rem; }

@media (max-width: 760px) {
    .nav-container { align-items: flex-start; flex-direction: column; gap: 0.75rem; }
    .nav-links { flex-wrap: wrap; gap: 0.25rem; }
    .btn-link { padding: 0.4rem 0.5rem; }
    .hero { padding-top: 3.5rem; }
    .hero h1 { font-size: 2.35rem; }
    .workflow-grid, .platform-layout { grid-template-columns: 1fr; }
    .platform-layout { gap: 2.5rem; }
    .cta-section { align-items: flex-start; flex-direction: column; }
    .section-heading h2, .platform-layout h2, .cta-section h2 { font-size: 1.9rem; }
}