:root{color-scheme:light;--navy:#172554;--blue:#1d4ed8;--paper:#f8fafc;--line:#cbd5e1;--ink:#172033;--muted:#526079;--white:#fff}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",sans-serif;background:var(--paper);color:var(--ink);line-height:1.55}a{color:inherit}.site-header{min-height:68px;display:flex;align-items:center;justify-content:space-between;padding:0 clamp(18px,4vw,64px);background:var(--navy);color:#fff;position:sticky;top:0;z-index:20;box-shadow:0 5px 18px #0f172a22}.brand{color:#fff;text-decoration:none;font-weight:850;font-size:1.08rem}.site-nav{display:flex;gap:28px}.site-nav a{color:#dbeafe;text-decoration:none;font-weight:700}.site-nav a:hover,.site-nav a:focus{color:#fff}.menu-button{display:none;border:1px solid #93c5fd;border-radius:8px;background:transparent;color:#fff;padding:8px 12px;font:inherit}
.hero{max-width:1220px;margin:0 auto;padding:clamp(52px,8vw,100px) clamp(20px,4vw,56px);display:grid;grid-template-columns:minmax(0,1.5fr) minmax(280px,.7fr);gap:clamp(36px,7vw,88px);align-items:center;background:radial-gradient(circle at 85% 20%,#dbeafe 0,transparent 30%)}.eyebrow{margin:0 0 12px;color:var(--blue);font-size:.75rem;font-weight:850;text-transform:uppercase;letter-spacing:.11em}.hero h1{max-width:800px;margin:0;font-size:clamp(2.45rem,6vw,5rem);line-height:1.02;letter-spacing:-.045em;color:var(--navy)}.hero-text{max-width:760px;margin:26px 0;color:var(--muted);font-size:clamp(1.05rem,2vw,1.25rem)}.primary-action{display:inline-block;padding:14px 20px;border-radius:10px;background:var(--blue);color:#fff;text-decoration:none;font-weight:800;box-shadow:0 10px 24px #1d4ed82e}.primary-action:hover,.primary-action:focus{background:#1e40af}.sequence-card{padding:28px;border:1px solid #bfdbfe;border-radius:18px;background:#ffffffd9;box-shadow:0 18px 50px #1e3a8a1a}.sequence-card>span{color:var(--blue);font-weight:850;text-transform:uppercase;font-size:.75rem;letter-spacing:.1em}.sequence-card ol{margin:18px 0 0;padding-left:22px}.sequence-card li{padding:7px 0;border-bottom:1px solid #e2e8f0;font-weight:650}.sequence-card li:last-child{border:0}
.chapter-section{padding:72px clamp(20px,4vw,64px);background:#fff}.section-heading{max-width:1180px;margin:0 auto 32px;display:flex;align-items:end;justify-content:space-between;gap:28px}.section-heading h2,.study-features h2{margin:0;color:var(--navy);font-size:clamp(2rem,4vw,3.2rem);letter-spacing:-.025em}.section-heading>p{max-width:430px;margin:0;color:var(--muted)}.chapter-grid{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.chapter-card{min-height:260px;display:flex;flex-direction:column;padding:26px;border:1px solid #d9e1ec;border-radius:16px;background:#fff;text-decoration:none;transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}.chapter-card:hover,.chapter-card:focus{transform:translateY(-4px);border-color:#93c5fd;box-shadow:0 15px 35px #17255417;outline:none}.chapter-card>span{color:var(--blue);font-weight:900;font-size:.8rem;letter-spacing:.1em}.chapter-card h3{margin:18px 0 10px;color:var(--navy);font-size:1.35rem;line-height:1.2}.chapter-card p{margin:0 0 22px;color:var(--muted)}.chapter-card strong{margin-top:auto;color:var(--blue)}.chapter-card:last-child{grid-column:2}
.study-features{padding:64px clamp(20px,4vw,64px);display:grid;grid-template-columns:1fr 1.4fr;gap:52px;max-width:1180px;margin:0 auto}.study-features ul{margin:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;padding:0;list-style:none}.study-features li{padding:18px;border:1px solid var(--line);border-radius:12px;background:#fff;font-weight:750}.study-features li::before{content:"✓";color:var(--blue);margin-right:10px}.web-ad{max-width:1180px;min-height:90px;margin:0 auto 60px;display:flex;align-items:center;justify-content:center;border:1px dashed #94a3b8;border-radius:12px;background:#fff;color:#64748b;font-size:.72rem;text-transform:uppercase;letter-spacing:.08em}.site-footer{padding:44px clamp(20px,4vw,64px);background:#0f172a;color:#cbd5e1;display:grid;grid-template-columns:1.3fr 1fr;gap:28px}.site-footer strong{color:#fff}.site-footer p{font-size:.86rem}.site-footer nav{display:flex;flex-wrap:wrap;gap:18px;align-content:start;justify-content:end}.site-footer a{color:#dbeafe}.copyright{grid-column:1/-1;margin:0;padding-top:20px;border-top:1px solid #334155}
.policy{max-width:850px;margin:0 auto;padding:42px 20px 72px;line-height:1.7}.policy h1,.policy h2{color:var(--navy)}.policy h1{font-size:clamp(2.2rem,5vw,3.5rem);letter-spacing:-.03em}.policy h2{margin-top:32px}.policy-footer{margin-top:42px;padding-top:22px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:16px;font-size:.9rem}
@media(max-width:900px){.hero{grid-template-columns:1fr}.chapter-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.chapter-card:last-child{grid-column:auto}.study-features{grid-template-columns:1fr}.section-heading{align-items:start;flex-direction:column}.site-footer{grid-template-columns:1fr}.site-footer nav{justify-content:start}.copyright{grid-column:auto}}
@media(max-width:650px){.menu-button{display:block}.site-nav{display:none;position:absolute;top:68px;left:0;right:0;padding:18px 22px;background:var(--navy);border-top:1px solid #334155;flex-direction:column;gap:14px}.site-nav.open{display:flex}.hero{padding-top:52px}.chapter-grid,.study-features ul{grid-template-columns:1fr}.chapter-card{min-height:220px}.site-footer nav{flex-direction:column;gap:10px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.chapter-card{transition:none}}