:root{--bg:#f6f7f9;--surface:#fff;--ink:#0f1c2e;--ink-soft:#44546a;--brand:#1a4d8f;--brand-dark:#133a6b;--accent:#2e8b57;--border:#e3e7ed;--danger:#b3261e;--radius:12px;--shadow:0 1px 2px rgba(15,28,46,.04),0 4px 12px rgba(15,28,46,.06)}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:16px;line-height:1.5;-webkit-font-smoothing:antialiased}.header{background:var(--surface);border-bottom:1px solid var(--border)}.header-inner{max-width:720px;margin:0 auto;padding:16px 20px;display:flex;align-items:center;justify-content:space-between}.logo{font-weight:700;font-size:18px;color:var(--brand);letter-spacing:-.01em}.lock{font-size:13px;color:var(--ink-soft)}main{padding:24px 20px 48px}.footer,main{max-width:720px;margin:0 auto}.footer{padding:24px 20px 40px;text-align:center;color:var(--ink-soft);font-size:13px}.footer-sub{margin-top:4px;opacity:.8}.course-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);margin-bottom:20px}.course-family{display:inline-block;font-size:12px;font-weight:600;color:var(--brand);background:rgba(26,77,143,.08);padding:4px 10px;border-radius:999px;margin-bottom:12px;text-transform:uppercase;letter-spacing:.04em}.course-title{font-size:24px;font-weight:700;margin:0 0 8px;letter-spacing:-.01em}.course-desc{color:var(--ink-soft);margin:0 0 16px;font-size:15px}.course-meta{gap:16px;font-size:14px;color:var(--ink-soft)}.course-meta,.price-row{display:flex;border-top:1px solid var(--border);padding-top:16px}.price-row{justify-content:space-between;align-items:baseline;margin-top:16px}.price-label{color:var(--ink-soft);font-size:14px}.price-amount{font-size:28px;font-weight:700;color:var(--ink)}.checkout-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}.checkout-title{font-size:18px;font-weight:600;margin:0 0 16px}.field{margin-bottom:16px}.field label{display:block;font-size:13px;font-weight:600;color:var(--ink);margin-bottom:6px}.field input{width:100%;padding:11px 12px;font-size:15px;border:1px solid var(--border);border-radius:8px;background:var(--surface);color:var(--ink);font-family:inherit}.field input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(26,77,143,.15)}.stripe-mount{padding:11px 12px;border:1px solid var(--border);border-radius:8px;background:var(--surface)}.stripe-mount.focused{border-color:var(--brand);box-shadow:0 0 0 3px rgba(26,77,143,.15)}.pay-button{width:100%;padding:14px;margin-top:8px;background:var(--brand);color:#fff;border:none;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer;transition:background .15s;font-family:inherit}.pay-button:hover:not(:disabled){background:var(--brand-dark)}.pay-button:disabled{opacity:.6;cursor:not-allowed}.error{margin-top:12px;padding:10px 12px;background:rgba(179,38,30,.08);border:1px solid rgba(179,38,30,.2);border-radius:8px;color:var(--danger);font-size:14px}.fine-print{margin-top:16px;font-size:12px;color:var(--ink-soft);text-align:center;line-height:1.5}.center-state{text-align:center;padding:64px 20px}.center-state h1{font-size:22px;margin:0 0 8px}.center-state p{color:var(--ink-soft);margin:0}.success-icon{width:64px;height:64px;margin:0 auto 20px;background:var(--accent);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:32px}.return-button{display:inline-block;margin-top:24px;padding:12px 24px;background:var(--brand);color:#fff;text-decoration:none;border-radius:8px;font-weight:600}