.pub{max-width:1040px;margin:0 auto;padding:40px 24px 80px;font-family:Inter,sans-serif;color:var(--charcoal);line-height:1.65}.pub h1,.pub h2,.pub h3{font-family:DM Sans,sans-serif;font-weight:700;letter-spacing:-.025em;color:var(--charcoal)}.pub h1{font-size:2.6rem;line-height:1.1;margin:0 0 18px}.pub h2{font-size:1.6rem;margin:0 0 20px}.pub h3{font-size:1.05rem;font-weight:600;margin:0 0 8px}.pub p{margin:0 0 16px}.pub-breadcrumb{display:flex;gap:8px;align-items:center;font-size:.8rem;color:var(--gray-500);margin-bottom:24px}.pub-breadcrumb a{color:var(--ember);text-decoration:none;font-weight:500}.pub-breadcrumb a:hover{text-decoration:underline}.pub-overline{display:inline-block;font-family:DM Sans,sans-serif;font-weight:600;font-size:.72rem;text-transform:uppercase;letter-spacing:.07em;color:var(--ember);background:var(--ember-bg);padding:5px 12px;border-radius:100px;margin:0 0 18px}.pub-hero{position:relative;background:radial-gradient(120% 140% at 100% 0%,var(--cream-dark) 0%,transparent 55%),#fff;border-radius:24px;padding:52px 48px;border-top:4px solid var(--ember);box-shadow:0 1px 3px #2c2c2c0a,0 8px 28px #2c2c2c12;margin-bottom:48px;overflow:hidden}.pub-accent-forest{border-top-color:var(--forest)}.pub-accent-forest .pub-overline{color:var(--forest);background:var(--forest-bg)}.pub-accent-sunbeam{border-top-color:var(--sunbeam)}.pub-accent-sunbeam .pub-overline{color:#b8860b;background:var(--sunbeam-bg)}.pub-lede{font-size:1.18rem;color:#4a4a4a;max-width:66ch}.pub-cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}.pub-btn{display:inline-flex;align-items:center;padding:13px 24px;border-radius:10px;font-family:DM Sans,sans-serif;font-weight:600;font-size:.98rem;text-decoration:none;transition:transform .1s ease,background .15s ease,box-shadow .15s ease}.pub-btn:active{transform:translateY(1px)}.pub-btn-primary{background:var(--ember);color:#fff;box-shadow:0 4px 14px #e8683a47}.pub-btn-primary:hover{background:#d4582c;box-shadow:0 6px 18px #e8683a57}.pub-btn-ghost{background:var(--cream-dark);color:var(--charcoal)}.pub-btn-ghost:hover{background:#ece2d2}.pub-section{margin-bottom:56px}.pub-section-lede{color:var(--gray-500);max-width:68ch;margin:-8px 0 24px}.pub-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px}.pub-card{background:#fff;border-radius:16px;padding:26px;border-left:4px solid var(--forest);box-shadow:0 1px 3px #2c2c2c0a,0 4px 16px #2c2c2c0f}.pub-card p{margin:0;font-size:.95rem;color:#4a4a4a}.pub-formulas{list-style:none;padding:0;margin:0;display:grid;gap:12px}.pub-formulas li{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;background:#fff;border-radius:14px;padding:18px 24px;box-shadow:0 1px 3px #2c2c2c0a,0 3px 12px #2c2c2c0d}.pub-formula-math{font-size:1.2rem;flex:1 1 auto}.pub-formula-meta{display:flex;flex-direction:column;align-items:flex-end;text-align:right}.pub-formula-label{font-family:DM Sans,sans-serif;font-weight:600;font-size:.92rem}.pub-formula-page{font-family:JetBrains Mono,monospace;font-size:.72rem;color:var(--gray-500);margin-top:2px}.pub-problem{background:#fff;border-radius:16px;padding:26px;margin-bottom:16px;box-shadow:0 1px 3px #2c2c2c0a,0 4px 16px #2c2c2c0f}.pub-problem-q{margin-bottom:10px;line-height:1.6}.pub-problem-a{display:inline-block;color:var(--forest);background:var(--forest-bg);font-size:.92rem;padding:4px 12px;border-radius:8px;margin-bottom:12px}.pub-problem-eli5 summary{cursor:pointer;font-family:DM Sans,sans-serif;font-weight:600;font-size:.9rem;color:var(--ember);list-style:none}.pub-problem-eli5 summary:before{content:"＋ ";font-weight:700}.pub-problem-eli5[open] summary:before{content:"－ "}.pub-problem-eli5 p{margin-top:10px;font-size:.95rem;color:#4a4a4a}.pub-note{font-size:.92rem;color:var(--gray-500);margin-top:18px}.pub-traps{padding-left:22px;display:grid;gap:10px}.pub-traps li{color:#4a4a4a;font-size:.95rem}.pub-traps li::marker{color:var(--ember)}.pub-facts{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px}.pub-facts li{background:#fff;border-radius:14px;padding:18px 22px;display:flex;flex-direction:column;gap:4px;box-shadow:0 1px 3px #2c2c2c0a,0 3px 12px #2c2c2c0d}.pub-facts span{font-size:.7rem;text-transform:uppercase;letter-spacing:.06em;color:var(--gray-500);font-family:DM Sans,sans-serif;font-weight:600}.pub-facts strong{font-size:1rem}.pub-topic-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px}.pub-topic-card{display:flex;flex-direction:column;gap:6px;background:#fff;border-radius:16px;padding:22px;text-decoration:none;border-left:4px solid var(--ember);color:var(--charcoal);box-shadow:0 1px 3px #2c2c2c0a,0 4px 16px #2c2c2c0f;transition:transform .12s ease,box-shadow .12s ease}.pub-topic-card:hover{transform:translateY(-3px);box-shadow:0 2px 6px #2c2c2c0f,0 12px 28px #2c2c2c1a}.pub-topic-card.pub-accent-forest{border-left-color:var(--forest)}.pub-topic-card.pub-accent-sunbeam{border-left-color:var(--sunbeam)}.pub-topic-num{font-family:DM Sans,sans-serif;font-weight:600;font-size:.7rem;text-transform:uppercase;letter-spacing:.06em;color:var(--gray-500)}.pub-topic-name{font-family:DM Sans,sans-serif;font-weight:700;font-size:1.08rem;line-height:1.2}.pub-topic-qs{font-size:.82rem;color:var(--gray-500)}.pub-faq{display:grid;gap:10px}.pub-faq .pub-problem-eli5{background:#fff;border-radius:12px;padding:16px 20px;box-shadow:0 1px 3px #2c2c2c0a}.pub-final-cta{background:linear-gradient(135deg,var(--charcoal) 0%,#3a3a3a 100%);color:var(--cream);border-radius:24px;padding:56px 44px;text-align:center}.pub-final-cta h2{color:var(--cream)}.pub-final-cta p{color:#d8d0c4;max-width:58ch;margin:0 auto 28px}@media(max-width:640px){.pub{padding:24px 16px 56px}.pub h1{font-size:1.95rem}.pub h2{font-size:1.35rem}.pub-hero{padding:32px 24px}.pub-final-cta{padding:40px 24px}.pub-lede{font-size:1.05rem}}