:root{--navy-950:#0c1b2a;--navy-800:#132437;--navy-700:#1c3049;--gold-500:#c8a24a;--gold-300:#e3c67c;--paper:#f6f4ef;--ink:#1b2530;--muted:#5b6672;--line:#dcd6c8;--good:#3b6b3f;--bad:#a6192e}*{box-sizing:border-box}body,html{padding:0;margin:0}body{background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Helvetica,Arial,sans-serif;line-height:1.6}h1,h2,h3{font-family:Georgia,Times New Roman,serif;color:var(--navy-800);margin:0}a{color:inherit}.wrap{max-width:980px}.wrap,.wrap-narrow{margin:0 auto;padding:0 24px}.wrap-narrow{max-width:820px}.nav{background:var(--navy-950);border-bottom:1px solid rgba(200,162,74,.25);position:-webkit-sticky;position:sticky;top:0;z-index:10}.nav-inner{display:flex;justify-content:space-between;height:60px;max-width:980px;margin:0 auto;padding:0 24px}.brand,.nav-inner{align-items:center}.brand{display:inline-flex;text-decoration:none}.brand-logo{height:36px;width:auto;display:block}.back-link{display:inline-flex;align-items:center;gap:8px;margin-top:28px;font-size:14px;font-weight:600;color:var(--navy-800);text-decoration:none;transition:color .12s ease}.back-link:hover{color:var(--gold-500)}.back-link-arrow{font-size:17px;line-height:1}.nav-links{display:flex;gap:20px;align-items:center}.nav-links a{color:#cfd6dc;text-decoration:none;font-size:14px}.nav-links a:hover{color:var(--gold-300)}.nav-links a.nav-active,.nav-links a.nav-login{color:var(--gold-300);font-weight:700}.nav-links button.nav-logout{background:none;border:none;padding:0;font-family:inherit;font-size:14px;color:#cfd6dc;cursor:pointer}.nav-links button.nav-logout:hover{color:var(--gold-300)}@media (max-width:640px){.nav-inner{height:auto;flex-wrap:wrap;gap:6px 0;padding:10px 16px}.nav-links{gap:14px;flex-wrap:wrap}.brand-logo{height:30px}}.hero{background:linear-gradient(160deg,var(--navy-950),var(--navy-800));color:#fff;padding:56px 0 44px}.hero h1{font-size:34px;color:#fff;max-width:680px}.hero p{color:#b9c2ca;font-size:16px;max-width:620px;margin-top:14px}.eyebrow{display:inline-block;font-size:12px;letter-spacing:2px;text-transform:uppercase;color:var(--gold-300);border:1px solid hsla(43,65%,69%,.4);padding:5px 12px;border-radius:999px;margin-bottom:18px}.meta-row{display:flex;gap:18px;margin-top:16px;font-size:13px;color:#8b96a1;flex-wrap:wrap}.btn-primary{display:inline-block;padding:13px 28px;border:none;border-radius:8px;background:var(--gold-500);color:var(--navy-950);font-size:15px;font-weight:700;cursor:pointer;text-decoration:none}.btn-primary:hover{background:var(--gold-300)}.btn-primary:disabled{background:#556;color:#999;cursor:not-allowed}.btn-secondary{display:inline-block;padding:12px 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rgba(19,36,55,.08)}.sec-card.locked{opacity:.55;cursor:default}.sec-num{flex:none;width:42px;height:42px;border-radius:50%;background:var(--navy-800);color:var(--gold-300);display:flex;align-items:center;justify-content:center;font-family:Georgia,serif;font-weight:700;font-size:17px}.sec-card.done .sec-num{background:var(--good);color:#fff}.sec-body{flex:1 1}.sec-body h3{font-size:17px}.sec-body p{color:var(--muted);font-size:13.5px;margin-top:4px}.sec-status{flex:none;font-size:12.5px;font-weight:700;letter-spacing:.5px;text-transform:uppercase;padding:6px 12px;border-radius:999px}.status-done{background:#e4efe5;color:var(--good)}.status-progress{background:#fbf0e4;color:#8a6d33}.status-locked,.status-todo{background:#eee;color:var(--muted)}.cert-panel{margin-top:36px;background:#fff;border:2px dashed var(--line);border-radius:12px;padding:30px;text-align:center}.cert-panel.unlocked{border-color:var(--gold-500);background:linear-gradient(160deg,#fffaf0,#fff)}.cert-panel h3{font-size:19px}.cert-panel p{color:var(--muted);font-size:14px;margin-top:8px;max-width:480px;margin-left:auto;margin-right:auto}.section-content .toc{background:#fff;border:1px solid var(--line);border-radius:10px;padding:20px 24px;margin:24px 0}.section-content .toc h3{font-size:13px;text-transform:uppercase;letter-spacing:1px;color:var(--muted);margin-bottom:10px}.section-content .toc-group{font-size:12px;text-transform:uppercase;letter-spacing:1px;color:var(--gold-500);font-weight:700;margin-top:12px;margin-bottom:4px}.section-content .toc ol{margin:0;padding-left:20px}.section-content .toc li{font-size:14px;margin-bottom:5px}.section-content .toc a{color:var(--navy-800);text-decoration:none}.section-content .toc a:hover{color:var(--gold-500)}.section-content .part-divider{margin:40px 0 18px;padding-bottom:10px;border-bottom:2px solid var(--gold-500)}.section-content .part-divider 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