:root{--bg: #f4f5fa;--surface: #ffffff;--surface-alt: #eef0f7;--text: #181a24;--text-muted: #5c6178;--border: #dde1ec;--primary: #3454d1;--primary-hover: #2a44ad;--primary-contrast: #ffffff;--accent: #c2660d;--accent-contrast: #ffffff;--success: #1f9d55;--danger: #d1453b;--chart-1: #3454d1;--chart-2: #c2660d;--chart-3: #1f9d55;--chart-4: #7c4fd1;--chart-5: #0f9b8e;--radius: 12px;--radius-sm: 8px;--radius-lg: 18px;--shadow: 0 1px 2px rgba(20, 22, 40, .06), 0 6px 16px rgba(20, 22, 40, .06);--shadow-hover: 0 2px 4px rgba(20, 22, 40, .08), 0 10px 24px rgba(20, 22, 40, .09);--shadow-lg: 0 8px 24px rgba(20, 22, 40, .08), 0 24px 56px rgba(20, 22, 40, .12);--font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--font-display: "Lexend", var(--font-body)}@media (prefers-color-scheme: dark){:root{--bg: #121319;--surface: #1b1d27;--surface-alt: #252836;--text: #eef0f7;--text-muted: #9aa0b8;--border: #333649;--primary: #7292ff;--primary-hover: #93aeff;--primary-contrast: #0e0f16;--accent: #e8963e;--accent-contrast: #221200;--success: #45c581;--danger: #ff6b61;--chart-1: #7292ff;--chart-2: #e8963e;--chart-3: #45c581;--chart-4: #a98af0;--chart-5: #3dc5b8;--shadow: 0 1px 2px rgba(0, 0, 0, .35), 0 8px 20px rgba(0, 0, 0, .3);--shadow-hover: 0 2px 4px rgba(0, 0, 0, .4), 0 12px 28px rgba(0, 0, 0, .38);--shadow-lg: 0 12px 32px rgba(0, 0, 0, .4), 0 32px 64px rgba(0, 0, 0, .35)}}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:var(--font-body);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent}a{color:var(--primary)}:focus-visible{outline:2px solid var(--primary);outline-offset:2px}.app-frame{min-height:100%;display:flex;flex-direction:column}.app-shell{flex:1;width:100%;max-width:880px;margin:0 auto;padding:16px 16px 48px}.topbar{padding:14px 0 16px;border-bottom:1px solid var(--border);margin-bottom:24px}.topbar__row{display:flex;align-items:center;justify-content:space-between}.topbar__brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:800;font-size:1.25rem;letter-spacing:-.02em;text-decoration:none;color:var(--text)}.topbar__toggle{display:none;flex-direction:column;justify-content:center;gap:4px;width:40px;height:40px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--surface);cursor:pointer}.topbar__toggle span{display:block;height:2px;margin:0 8px;background:var(--text);border-radius:2px}.topbar__nav{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:14px}.topbar__nav a.btn{border-color:transparent;background:transparent}.topbar__nav a.btn.active{background:var(--surface-alt);border-color:var(--border);color:var(--primary)}.topbar__user{margin-left:auto;padding:0 4px}@media (max-width: 640px){.topbar__toggle{display:flex}.topbar__nav{display:none;flex-direction:column;align-items:stretch;margin-top:12px}.topbar__nav--open{display:flex}.topbar__nav a.btn,.topbar__nav button.btn{width:100%}.topbar__user{margin-left:0;padding:6px 4px}}.app-footer{border-top:1px solid var(--border);padding:18px 16px 28px;text-align:center;color:var(--text-muted);font-size:.82rem;max-width:640px;margin:0 auto;line-height:1.5}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow);padding:24px;margin-bottom:16px}.card--interactive{transition:box-shadow .15s,transform .15s}.card--interactive:hover{box-shadow:var(--shadow-hover);transform:translateY(-1px)}.card--accent{border-color:color-mix(in srgb,var(--accent) 35%,var(--border));border-left:4px solid var(--accent)}.grid{display:grid;gap:16px}@media (min-width: 640px){.grid--2{grid-template-columns:1fr 1fr}}h1,h2,h3{font-family:var(--font-display);line-height:1.22;letter-spacing:-.015em;font-weight:700}h1{font-size:1.7rem}h2{font-size:1.25rem}h3{font-size:1.05rem}.text-muted{color:var(--text-muted)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:44px;padding:10px 18px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--surface);color:var(--text);font-size:.95rem;font-weight:600;cursor:pointer;text-decoration:none;transition:background .15s,border-color .15s,transform .05s}.btn:hover{background:var(--surface-alt)}.btn:active{transform:translateY(1px)}.btn--primary{background:var(--primary);border-color:var(--primary);color:var(--primary-contrast)}.btn--primary:hover{background:var(--primary-hover);border-color:var(--primary-hover)}.btn--accent{background:var(--accent);border-color:var(--accent);color:var(--accent-contrast)}.btn--accent:hover{filter:brightness(1.08)}.btn--full{width:100%}.btn:disabled{opacity:.5;cursor:not-allowed}.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}.field label{font-size:.85rem;font-weight:600;color:var(--text-muted)}.field input,.field select{min-height:44px;padding:10px 12px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--surface);color:var(--text);font-size:1rem}.field input:focus,.field select:focus{outline:2px solid var(--primary);outline-offset:1px}.error-text{color:var(--danger);font-size:.9rem}.badge{display:inline-block;padding:3px 10px;border-radius:999px;background:var(--surface-alt);color:var(--text-muted);font-size:.76rem;font-weight:700;letter-spacing:.02em;text-transform:uppercase}.badge--accent{background:color-mix(in srgb,var(--accent) 18%,var(--surface));color:var(--accent)}.notice{display:flex;gap:10px;align-items:flex-start;padding:12px 14px;border-radius:var(--radius-sm);background:var(--surface-alt);border:1px solid var(--border);color:var(--text-muted);font-size:.86rem;line-height:1.5;margin-bottom:16px}.notice__icon{flex-shrink:0;font-weight:800;color:var(--accent)}.option-list{display:flex;flex-direction:column;gap:10px;margin:16px 0}.option{display:flex;align-items:flex-start;gap:12px;min-height:48px;padding:13px 15px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--surface);cursor:pointer;text-align:left;font-size:1rem;color:var(--text);transition:border-color .15s,background .15s}.option:hover{border-color:var(--primary)}.option--selected{border-color:var(--primary);background:color-mix(in srgb,var(--primary) 12%,var(--surface))}.option--correct{border-color:var(--success);background:color-mix(in srgb,var(--success) 16%,var(--surface))}.option--incorrect{border-color:var(--danger);background:color-mix(in srgb,var(--danger) 16%,var(--surface))}.progress-bar{height:8px;border-radius:999px;background:var(--surface-alt);overflow:hidden}.progress-bar__fill{height:100%;background:var(--primary);transition:width .2s}.timer{font-variant-numeric:tabular-nums;font-weight:700;font-size:1.1rem}.timer--low{color:var(--danger)}table{border-collapse:collapse;width:100%}.diagram-wrap{background:var(--surface-alt);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px;margin-bottom:12px;overflow-x:auto}.diagram-wrap svg{display:block;width:100%;height:auto;max-width:480px;margin:0 auto}.passage-text{white-space:pre-wrap;line-height:1.6;background:var(--surface-alt);border-radius:var(--radius-sm);padding:14px 16px;margin-bottom:16px}.stat-row{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:10px 0;border-bottom:1px solid var(--border)}.stat-row:last-child{border-bottom:none}.auth-page{min-height:100%;display:flex;align-items:center;justify-content:center;padding:24px;background:radial-gradient(560px circle at 12% 8%,color-mix(in srgb,var(--primary) 14%,transparent),transparent 60%),radial-gradient(560px circle at 88% 92%,color-mix(in srgb,var(--accent) 12%,transparent),transparent 60%),var(--bg)}.auth-card{width:100%;max-width:408px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:40px 34px}.auth-brand{display:flex;flex-direction:column;align-items:center;text-align:center;gap:12px;margin-bottom:28px}.auth-brand__logo{filter:drop-shadow(0 6px 14px color-mix(in srgb,var(--primary) 35%,transparent))}.auth-brand h1{font-size:1.4rem;margin:0}.auth-brand p{color:var(--text-muted);margin:0;font-size:.92rem;max-width:30ch}.auth-footer-link{text-align:center;margin-top:22px;font-size:.9rem;color:var(--text-muted)}.auth-footer-link a{font-weight:600}.auth-disclaimer{text-align:center;margin-top:18px;font-size:.76rem;color:var(--text-muted);max-width:340px;line-height:1.5}.page-header{margin-bottom:24px}.page-header__eyebrow{display:inline-block;font-size:.76rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--primary);margin-bottom:8px}.page-header h1{margin:0 0 6px}.page-header p{color:var(--text-muted);margin:0;max-width:62ch}.stat-tile{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow);padding:20px 22px}.stat-tile__label{color:var(--text-muted);font-size:.82rem;font-weight:600}.stat-tile__value{font-family:var(--font-display);font-size:2rem;font-weight:700;letter-spacing:-.02em;margin-top:4px}.landing{min-height:100%;display:flex;flex-direction:column}.landing__header{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:20px 24px;max-width:1100px;margin:0 auto;width:100%}.landing__header-brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:800;font-size:1.2rem;letter-spacing:-.02em;text-decoration:none;color:var(--text)}.landing__hero{padding:40px 24px 64px;text-align:center;background:radial-gradient(700px circle at 18% 0%,color-mix(in srgb,var(--primary) 16%,transparent),transparent 60%),radial-gradient(700px circle at 85% 25%,color-mix(in srgb,var(--accent) 12%,transparent),transparent 55%),var(--bg)}.landing__hero-inner{max-width:700px;margin:0 auto}.landing__eyebrow{display:inline-flex;align-items:center;gap:7px;padding:7px 16px;border-radius:999px;background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow);font-size:.8rem;font-weight:700;color:var(--primary);margin-bottom:22px}.landing__hero h1{font-size:clamp(2rem,5vw,2.9rem);margin:0 0 16px}.landing__hero p{font-size:1.08rem;color:var(--text-muted);max-width:54ch;margin:0 auto 30px;line-height:1.6}.landing__cta-row{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-bottom:16px}.landing__cta-row .btn{min-width:190px}.landing__hero-note{font-size:.8rem;color:var(--text-muted)}.landing__section{max-width:1040px;margin:0 auto;padding:8px 24px 64px;width:100%}.landing__section-heading{text-align:center;margin-bottom:8px}.landing__section-sub{text-align:center;color:var(--text-muted);max-width:56ch;margin:0 auto 32px}.feature-grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}.feature-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow);padding:22px 20px}.feature-card__icon{width:40px;height:40px;border-radius:10px;display:flex;align-items:center;justify-content:center;background:color-mix(in srgb,var(--primary) 14%,var(--surface));color:var(--primary);margin-bottom:14px}.feature-card h3{margin:0 0 6px}.feature-card p{color:var(--text-muted);margin:0;font-size:.92rem;line-height:1.55}.landing__delprov-strip{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}.landing__cta-band{text-align:center;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow);padding:40px 24px}.landing__cta-band h2{margin:0 0 8px}.landing__cta-band p{color:var(--text-muted);margin:0 0 22px}.landing__footer{margin-top:auto;border-top:1px solid var(--border);padding:22px 24px 28px;text-align:center;color:var(--text-muted);font-size:.8rem;max-width:640px;margin-left:auto;margin-right:auto;line-height:1.5}