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var(--ease-apple);font-size:12px}.site-nav a:hover{opacity:1}.hero{text-align:center;background:linear-gradient(180deg, var(--bg-elevated) 0%, var(--bg) 100%);padding:88px 22px 56px}.hero h1{letter-spacing:-.015em;margin-bottom:12px;font-size:clamp(40px,6vw,64px);font-weight:700;line-height:1.05}.hero p{color:var(--text-secondary);max-width:560px;margin:0 auto;font-size:clamp(18px,2.4vw,24px);font-weight:400}.section{padding:56px 22px}.section-title{letter-spacing:-.015em;text-align:center;margin-bottom:40px;font-size:32px;font-weight:700}.book-grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px;max-width:1024px;margin:0 auto;display:grid}.book-card{background:var(--card-bg);border:1px solid var(--border);transition:transform .35s var(--ease-apple), box-shadow .35s var(--ease-apple);border-radius:20px;flex-direction:column;display:flex;overflow:hidden}.book-card:hover{box-shadow:var(--shadow);transform:translateY(-4px)}.book-cover{aspect-ratio:3/4;background:var(--bg-elevated);width:100%}.book-info{flex-direction:column;flex:1;gap:4px;padding:20px;display:flex}.book-title{letter-spacing:-.01em;font-size:17px;font-weight:600}.book-author{color:var(--text-secondary);font-size:13px}.book-tagline{color:var(--text-secondary);flex:1;margin-top:6px;font-size:13px}.book-price-row{justify-content:space-between;align-items:center;margin-top:16px;display:flex}.book-price{font-size:15px;font-weight:600}.badge{color:var(--text-secondary);background:var(--bg-elevated);border-radius:980px;padding:4px 10px;font-size:11px;font-weight:600}.btn{cursor:pointer;transition:background-color .2s var(--ease-apple), transform .15s var(--ease-apple);white-space:nowrap;border:none;border-radius:980px;justify-content:center;align-items:center;gap:8px;padding:10px 20px;font-size:15px;font-weight:500;display:inline-flex}.btn:active{transform:scale(.97)}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover)}.btn-primary:active{background:var(--accent-active)}.btn-primary:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn-secondary{background:var(--bg-elevated);color:var(--text)}.btn-secondary:hover{background:var(--border)}.btn-block{width:100%}.book-detail{grid-template-columns:320px 1fr;align-items:start;gap:48px;max-width:1024px;margin:0 auto;padding:56px 22px 80px;display:grid}@media (max-width:720px){.book-detail{text-align:center;grid-template-columns:1fr;justify-items:center}}.book-detail-cover{width:100%;box-shadow:var(--shadow);border-radius:24px;overflow:hidden}.book-detail-eyebrow{color:var(--accent);margin-bottom:8px;font-size:13px;font-weight:600}.book-detail h1{letter-spacing:-.015em;margin-bottom:8px;font-size:clamp(32px,4vw,44px);font-weight:700}.book-detail-author{color:var(--text-secondary);margin-bottom:20px;font-size:17px}.book-detail-description{color:var(--text);max-width:480px;margin-bottom:28px;font-size:17px;line-height:1.6}.purchase-card{border:1px solid var(--border);background:var(--bg-elevated);border-radius:18px;width:100%;max-width:380px;padding:24px}.purchase-row{justify-content:space-between;align-items:baseline;margin-bottom:16px;display:flex}.purchase-price{letter-spacing:-.02em;font-size:28px;font-weight:700}.purchase-note{color:var(--text-secondary);text-align:center;margin-top:12px;font-size:12px}.error-text{color:#ff3b30;text-align:center;margin-top:10px;font-size:13px}.checkout-shell{background:var(--bg-elevated);justify-content:center;align-items:center;min-height:100dvh;padding:24px;display:flex}.checkout-card{background:var(--card-bg);box-shadow:var(--shadow);border-radius:20px;width:100%;max-width:420px;padding:32px}.demo-banner{color:#664d03;text-align:center;background:#fff3cd;border-radius:10px;margin-bottom:20px;padding:10px 14px;font-size:12px;font-weight:600}@media (prefers-color-scheme:dark){.demo-banner{color:#ffd970;background:#3d3316}}.checkout-summary{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;margin-bottom:20px;padding-bottom:16px;display:flex}.checkout-field{margin-bottom:14px}.checkout-field label{color:var(--text-secondary);margin-bottom:6px;font-size:12px;font-weight:600;display:block}.checkout-field input{border:1px solid var(--border);background:var(--bg);width:100%;color:var(--text);border-radius:10px;padding:11px 12px;font-family:inherit;font-size:15px}.checkout-field input:focus{outline:2px solid var(--accent);outline-offset:1px}.checkout-row{gap:12px;display:flex}.checkout-row .checkout-field{flex:1}.reader-shell{flex-direction:column;flex:1;display:flex}.reader-bar{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:14px 22px;display:flex}.reader-frame{border:none;flex:1;width:100%;min-height:70dvh}.status-shell{text-align:center;flex:1;justify-content:center;align-items:center;padding:60px 22px;display:flex}.status-card h1{letter-spacing:-.01em;margin-bottom:12px;font-size:28px;font-weight:700}.status-card p{color:var(--text-secondary);max-width:420px;margin-bottom:24px}.site-footer{border-top:1px solid var(--border);text-align:center;color:var(--text-secondary);padding:28px 22px;font-size:12px}.spinner{border:2px solid #fff6;border-top-color:#fff;border-radius:50%;width:16px;height:16px;animation:.7s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}