:root{--navy:#033371;--navy-dark:#021f45;--navy-tint-10:#e6ecf4;--navy-tint-20:#ccd9e9;--yellow:#ffd203;--yellow-dark:#e0ba00;--white:#fff;--bg:#f5f7fa;--surface:#fff;--text:#172033;--text-secondary:#667085;--text-muted:#98a2b3;--border:#e5e7eb;--border-strong:#d0d5dd;--success:#12805c;--success-bg:#e6f4ef;--warning:#b7791f;--warning-bg:#fdf3e3;--danger:#c0362c;--danger-bg:#fceae8;--info:#1d4ed8;--info-bg:#e8eefc;--radius-lg:16px;--radius:12px;--radius-sm:8px;--radius-pill:999px;--shadow-sm:0 1px 2px #1720330f;--shadow-md:0 4px 16px #17203314;--shadow-lg:0 12px 32px #1720331f;--space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:20px;--space-6:24px;--space-8:32px;--space-10:40px;--space-12:48px;--font-sans:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}*{box-sizing:border-box}html,body{margin:0;padding:0}body{font-family:var(--font-sans);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;line-height:1.5}#root{min-height:100vh}h1,h2,h3,h4,h5,h6{color:var(--text);letter-spacing:-.01em;margin:0;font-weight:700}p{margin:0}a{color:var(--navy);text-decoration:none}a:hover{text-decoration:underline}button{font-family:inherit}img{max-width:100%;display:block}ul,ol{margin:0;padding:0;list-style:none}:focus-visible{outline:2px solid var(--navy);outline-offset:2px}.container{width:100%;max-width:1180px;padding:0 var(--space-5);margin:0 auto}.stack{flex-direction:column;display:flex}.row{align-items:center;display:flex}.grid{gap:var(--space-5);display:grid}.visually-hidden{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.skip-link{background:var(--navy);color:var(--white);padding:var(--space-2) var(--space-4);z-index:1000;border-radius:0 0 var(--radius-sm) 0;position:absolute;top:0;left:-999px}.skip-link:focus{left:0}.btn{justify-content:center;align-items:center;gap:var(--space-2);border-radius:var(--radius-sm);cursor:pointer;white-space:nowrap;border:1px solid #0000;padding:.7rem 1.25rem;font-size:.9375rem;font-weight:600;transition:background-color .15s,border-color .15s,color .15s,transform 50ms;display:inline-flex}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.55;cursor:not-allowed;transform:none}.btn-block{width:100%}.btn-sm{padding:.45rem .85rem;font-size:.8125rem}.btn-lg{padding:.9rem 1.5rem;font-size:1rem}.btn-primary{background:var(--navy);color:var(--white)}.btn-primary:hover:not(:disabled){background:var(--navy-dark)}.btn-accent{background:var(--yellow);color:var(--navy-dark)}.btn-accent:hover:not(:disabled){background:var(--yellow-dark)}.btn-secondary{background:var(--white);color:var(--navy);border-color:var(--border-strong)}.btn-secondary:hover:not(:disabled){background:var(--navy-tint-10)}.btn-ghost{color:var(--text-secondary);background:0 0}.btn-ghost:hover:not(:disabled){background:var(--navy-tint-10);color:var(--navy)}.btn-danger{background:var(--white);color:var(--danger);border-color:var(--danger)}.btn-danger:hover:not(:disabled){background:var(--danger-bg)}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:var(--space-6)}.card-tight{padding:var(--space-4)}.card-interactive{cursor:pointer;transition:border-color .15s,box-shadow .15s}.card-interactive:hover{border-color:var(--navy);box-shadow:var(--shadow-md)}.card-selected{border-color:var(--navy);background:var(--navy-tint-10)}.panel-dark{background:var(--navy-dark);color:var(--white);border-radius:var(--radius-lg);padding:var(--space-6)}.panel-dark .text-secondary{color:#ffffffa6}.field{gap:var(--space-2);margin-bottom:var(--space-4);flex-direction:column;display:flex}.field label{color:var(--text);font-size:.8125rem;font-weight:600}.field-hint{color:var(--text-secondary);font-size:.75rem}.field-error{color:var(--danger);font-size:.75rem}.input,.select{border:1px solid var(--border-strong);border-radius:var(--radius-sm);width:100%;color:var(--text);background:var(--white);padding:.7rem .9rem;font-family:inherit;font-size:.9375rem}.input:focus,.select:focus{border-color:var(--navy);box-shadow:0 0 0 3px var(--navy-tint-10);outline:none}.input.has-error,.select.has-error{border-color:var(--danger)}.input-icon-wrap{position:relative}.input-icon-wrap .input{padding-left:2.5rem}.input-icon-wrap svg{color:var(--text-muted);position:absolute;top:50%;left:.85rem;transform:translateY(-50%)}.checkbox-row{align-items:flex-start;gap:var(--space-2);color:var(--text-secondary);font-size:.8125rem;display:flex}.badge{align-items:center;gap:var(--space-1);text-transform:uppercase;letter-spacing:.03em;border-radius:var(--radius-pill);padding:.25rem .6rem;font-size:.6875rem;font-weight:700;display:inline-flex}.badge-navy{background:var(--navy-tint-10);color:var(--navy)}.badge-yellow{color:#6b5900;background:#fff6cc}.badge-success{background:var(--success-bg);color:var(--success)}.badge-warning{background:var(--warning-bg);color:var(--warning)}.badge-danger{background:var(--danger-bg);color:var(--danger)}.badge-neutral{background:var(--bg);color:var(--text-secondary);border:1px solid var(--border)}.progress-track{border-radius:var(--radius-pill);background:var(--border);width:100%;height:8px;overflow:hidden}.progress-fill{border-radius:var(--radius-pill);background:var(--navy);height:100%;transition:width .7s cubic-bezier(.16,1,.3,1)}@media (prefers-reduced-motion:reduce){.progress-fill{transition:none}}.progress-fill.tone-success{background:var(--success)}.progress-fill.tone-warning{background:var(--warning)}.progress-fill.tone-danger{background:var(--danger)}.step-indicator{gap:var(--space-2);justify-content:center;display:flex}.step-indicator .step{border-radius:var(--radius-pill);background:var(--border);width:40px;height:4px}.step-indicator .step.done{background:var(--navy-tint-20)}.step-indicator .step.active{background:var(--navy)}.app-shell{flex-direction:column;min-height:100vh;display:flex}.top-nav{background:var(--white);border-bottom:1px solid var(--border);z-index:40;position:sticky;top:0}.top-nav-inner{justify-content:space-between;align-items:center;height:64px;display:flex}.brand{align-items:center;gap:var(--space-2);color:var(--navy);font-size:1.05rem;font-weight:800;display:flex}.brand-mark{border-radius:var(--radius-sm);background:var(--navy);width:34px;height:34px;color:var(--white);justify-content:center;align-items:center;display:flex}.top-nav-links{align-items:center;gap:var(--space-1);display:flex}.top-nav-link{border-radius:var(--radius-sm);color:var(--text-secondary);padding:.55rem .9rem;font-size:.875rem;font-weight:600}.top-nav-link:hover{background:var(--bg);color:var(--text);text-decoration:none}.top-nav-link.active{background:var(--navy-tint-10);color:var(--navy)}.main-content{width:100%;padding:var(--space-6) 0 calc(var(--space-10) + 64px);flex:1}.bottom-nav{display:none}@media (width<=860px){.top-nav-links.desktop-only{display:none}.main-content{padding-bottom:calc(72px + var(--space-6))}.bottom-nav{background:var(--white);border-top:1px solid var(--border);z-index:40;padding:var(--space-1) 0;padding-bottom:max(var(--space-1), env(safe-area-inset-bottom));display:flex;position:fixed;bottom:0;left:0;right:0}.bottom-nav-link{padding:var(--space-2) 0;color:var(--text-secondary);flex-direction:column;flex:1;align-items:center;gap:2px;font-size:.6875rem;font-weight:600;display:flex}.bottom-nav-link.active{color:var(--navy)}}.text-secondary{color:var(--text-secondary)}.text-muted{color:var(--text-muted)}.text-success{color:var(--success)}.text-warning{color:var(--warning)}.text-danger{color:var(--danger)}.text-center{text-align:center}.divider{background:var(--border);height:1px;margin:var(--space-5) 0;border:none}.spinner{border:3px solid var(--navy-tint-20);border-top-color:var(--navy);border-radius:50%;width:22px;height:22px;animation:.7s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.page-header{margin-bottom:var(--space-6)}.page-header h1{font-size:1.5rem}.page-header p{color:var(--text-secondary);margin-top:var(--space-1)}.empty-state{text-align:center;padding:var(--space-10) var(--space-6);color:var(--text-secondary)}.option-card{border:1px solid var(--border-strong);border-radius:var(--radius);padding:var(--space-4);cursor:pointer;background:var(--white);text-align:left;width:100%;transition:border-color .15s,background-color .15s}.option-card:hover{border-color:var(--navy)}.option-card.selected{border-color:var(--navy);background:var(--navy-tint-10)}.option-card.correct{border-color:var(--success);background:var(--success-bg)}.option-card.incorrect{border-color:var(--danger);background:var(--danger-bg)}@media (width<=640px){.container{padding:0 var(--space-4)}.card{padding:var(--space-4)}}.reveal{animation:.5s cubic-bezier(.16,1,.3,1) both reveal-in;animation-delay:var(--reveal-delay,0s)}@keyframes reveal-in{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@media (prefers-reduced-motion:reduce){.reveal{animation:none}}.tutor-overlay{z-index:100;background:#021f4573;animation:.15s tutor-fade;position:fixed;inset:0}.tutor-panel{background:var(--surface);width:440px;max-width:100vw;box-shadow:var(--shadow-lg);z-index:101;flex-direction:column;animation:.22s cubic-bezier(.16,1,.3,1) tutor-slide-in;display:flex;position:fixed;top:0;bottom:0;right:0}@keyframes tutor-fade{0%{opacity:0}to{opacity:1}}@keyframes tutor-slide-in{0%{opacity:0;transform:translate(24px)}to{opacity:1;transform:translate(0)}}@media (width<=520px){.tutor-panel{width:100vw}}@media (prefers-reduced-motion:reduce){.tutor-overlay,.tutor-panel{animation:none}}.tutor-header{justify-content:space-between;align-items:flex-start;gap:var(--space-3);padding:var(--space-5);border-bottom:1px solid var(--border);flex-shrink:0;display:flex}.tutor-messages{padding:var(--space-5);gap:var(--space-3);flex-direction:column;flex:1;display:flex;overflow-y:auto}.tutor-bubble{white-space:pre-wrap;max-width:86%;padding:.7rem .95rem;font-size:.9rem;line-height:1.55}.tutor-bubble.assistant{background:var(--navy-tint-10);color:var(--text);border-radius:var(--radius) var(--radius) var(--radius) 4px;align-self:flex-start}.tutor-bubble.user{background:var(--navy);color:var(--white);border-radius:var(--radius) var(--radius) 4px var(--radius);align-self:flex-end}.tutor-bubble.error{background:var(--danger-bg);color:var(--danger);border-radius:var(--radius) var(--radius) var(--radius) 4px;align-self:flex-start}.tutor-typing{align-items:center;gap:4px;padding:.2rem 0;display:inline-flex}.tutor-typing span{background:var(--navy);opacity:.4;border-radius:50%;width:6px;height:6px;animation:1s ease-in-out infinite tutor-typing-bounce}.tutor-typing span:nth-child(2){animation-delay:.15s}.tutor-typing span:nth-child(3){animation-delay:.3s}@keyframes tutor-typing-bounce{0%,60%,to{opacity:.4;transform:translateY(0)}30%{opacity:.9;transform:translateY(-4px)}}.tutor-chips{gap:var(--space-2);padding:0 var(--space-5) var(--space-3);flex-shrink:0;display:flex;overflow-x:auto}.tutor-chip{border:1px solid var(--border-strong);background:var(--white);color:var(--text-secondary);border-radius:var(--radius-pill);cursor:pointer;white-space:nowrap;flex-shrink:0;padding:.4rem .75rem;font-size:.75rem;font-weight:600;transition:border-color .15s,color .15s}.tutor-chip:hover:not(:disabled){border-color:var(--navy);color:var(--navy)}.tutor-chip:disabled{opacity:.5;cursor:not-allowed}.tutor-input-row{gap:var(--space-2);padding:var(--space-4) var(--space-5);border-top:1px solid var(--border);flex-shrink:0;align-items:center;display:flex}.tutor-footnote{padding:0 var(--space-5) var(--space-4);color:var(--text-muted);flex-shrink:0;font-size:.6875rem}.auth-split{grid-template-columns:1fr 1fr;width:100%;max-width:960px;min-height:640px;padding:0;display:grid;overflow:hidden}.auth-side-panel{background:var(--navy-dark);color:var(--white);border-radius:0;flex-direction:column;display:flex;position:relative}.auth-side-panel .text-secondary{color:#ffffffa6}.auth-side-photo{object-fit:cover;width:100%;height:46%;display:block}.auth-side-body{justify-content:center;gap:var(--space-4);padding:var(--space-6) var(--space-8);flex-direction:column;flex:1;display:flex}.auth-side-panel.auth-side-panel--photo{background-position:50%;background-size:cover;justify-content:flex-end}.auth-side-scrim{background:linear-gradient(#021f4500 0%,#021f4559 38%,#021f45d1 68%,#021f45f5 100%);position:absolute;inset:0}.auth-side-panel--photo .auth-side-body{padding:var(--space-8);flex:none;justify-content:flex-end;position:relative}.auth-mobile-brand{margin-bottom:var(--space-6);justify-content:center;display:none}.auth-form-side{padding:var(--space-8);flex-direction:column;justify-content:center;display:flex}@media (width<=760px){.auth-split{grid-template-columns:1fr;min-height:0}.auth-side-panel{display:none}.auth-mobile-brand{display:flex}}