:root{--color-bg:#fafafa;--color-surface:#fff;--color-surface-2:#f4f4f5;--color-surface-glass:#ffffffd9;--color-border:#e4e4e7;--color-border-subtle:#f4f4f5;--color-text:#18181b;--color-text-secondary:#52525b;--color-text-muted:#71717a;--color-text-placeholder:#a1a1aa;--color-accent:#ea580c;--color-accent-hover:#c2410c;--color-accent-active:#9a3412;--color-accent-subtle:#fff7ed;--color-success:#16a34a;--color-success-bg:#f0fdf4;--color-success-ink:#15803d;--color-warning:#d97706;--color-warning-bg:#fffbeb;--color-warning-ink:#92400e;--color-error:#dc2626;--color-error-bg:#fef2f2;--color-error-ink:#b91c1c;--color-focus:#ea580c;--color-scrim:#0006;--color-scrim-deep:#000c;--color-scrim-text:#fafafa;--font-display:"Space Grotesk", "Instrument Sans", system-ui, sans-serif;--font-body:"Instrument Sans", "Avenir Next", system-ui, sans-serif;--font-mono:"IBM Plex Mono", "SFMono-Regular", ui-monospace, monospace;--font-wordmark:"Space Grotesk", "Instrument Sans", system-ui, sans-serif;--text-xs:.6875rem;--text-sm:.8125rem;--text-base:1rem;--text-md:1.25rem;--text-lg:1.5625rem;--text-xl:1.9531rem;--text-2xl:2.35rem;--text-display:clamp(2.65rem, 4.5vw + .75rem, 5.25rem);--space-3xs:.125rem;--space-2xs:.25rem;--space-xs:.5rem;--space-sm:.75rem;--space-md:1rem;--space-lg:1.5rem;--space-xl:2.5rem;--space-2xl:4rem;--space-3xl:6rem;--radius-sm:6px;--radius-md:8px;--radius-lg:10px;--z-base:1;--z-raised:10;--z-sticky:200;--z-sticky-nav:300;--z-sheet:400;--topbar-height:4.25rem;--ease-out:cubic-bezier(.16, 1, .3, 1);--ease-in:cubic-bezier(.7, 0, .84, 0);--dur-micro:.12s;--dur-short:.22s;--dur-long:.42s;--shadow-sm:0 1px 2px #0000000d}[data-theme=dark]{--color-bg:#09090b;--color-surface:#18181b;--color-surface-2:#27272a;--color-surface-glass:#18181bd9;--color-border:#27272a;--color-border-subtle:#3f3f46;--color-text:#fafafa;--color-text-secondary:#a1a1aa;--color-text-muted:#71717a;--color-text-placeholder:#52525b;--color-accent:#f97316;--color-accent-hover:#fb923c;--color-accent-active:#ea580c;--color-accent-subtle:#431407;--color-success:#22c55e;--color-success-bg:#052e16;--color-success-ink:#86efac;--color-warning:#fbbf24;--color-warning-bg:#451a03;--color-warning-ink:#fde68a;--color-error:#ef4444;--color-error-bg:#450a0a;--color-error-ink:#fca5a5;--color-focus:#f97316;--color-scrim:#0009;--color-scrim-deep:#000000e0;--color-scrim-text:#fafafa;--shadow-sm:0 1px 2px #0003}*{box-sizing:border-box}html,body{margin:0;padding:0;overflow-x:clip}html{-webkit-text-size-adjust:100%}body{background:var(--color-bg);color:var(--color-text);font-family:var(--font-body);font-size:var(--text-base);font-variant-numeric:tabular-nums;-webkit-font-smoothing:antialiased;touch-action:manipulation;-webkit-tap-highlight-color:transparent;line-height:1.55}.sr-only{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{z-index:100;padding:var(--space-xs) var(--space-sm);background:var(--color-text);color:var(--color-bg);font-size:var(--text-sm);transition:inset-block-start .12s var(--ease-out);text-decoration:none;position:absolute;inset-block-start:-40px;inset-inline-start:var(--space-md)}.skip-link:focus-visible{inset-block-start:var(--space-xs)}.list-item{content-visibility:auto;contain-intrinsic-size:auto 14rem}button{font:inherit;color:inherit;cursor:pointer;background:0 0;border:none;padding:0}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible{outline:2px solid var(--color-focus);outline-offset:2px}h1,h2,h3,h4{font-family:var(--font-display);letter-spacing:-.03em;overflow-wrap:anywhere;margin:0;font-style:normal;font-weight:600;line-height:1.08}p{margin:0}.shell{grid-template-columns:14rem minmax(0,1fr);min-height:100dvh;display:grid}@media (width<=60rem){.shell{grid-template-columns:1fr}}main{min-width:0;padding-inline:clamp(1rem,4vw,2.5rem);padding-block:var(--space-lg) var(--space-3xl)}.content{max-width:60rem;margin-inline:auto}@media (width<=40rem){main{padding-block-start:var(--space-md)}}.kicker,.section-label{font-family:var(--font-mono);font-size:var(--text-xs);letter-spacing:.09em;text-transform:uppercase;color:var(--color-text-muted);font-weight:600}.page-head{justify-content:space-between;align-items:end;gap:var(--space-md);border-block-end:1px solid var(--color-border);flex-wrap:wrap;margin-block-end:var(--space-xl);padding-block-end:var(--space-md);display:flex}.page-title{max-width:16ch;font-size:var(--text-display);letter-spacing:-.045em}.kicker{color:var(--color-accent);margin-block-end:var(--space-xs);display:block}.lede{color:var(--color-text-muted);max-width:45ch;margin-block-start:var(--space-sm)}.rule{border:0;border-block-start:1px solid var(--color-border);margin-block:var(--space-lg)}.small{font-family:var(--font-mono);font-size:var(--text-xs);letter-spacing:.09em;text-transform:uppercase;color:var(--color-text-muted);margin-block-end:var(--space-sm);font-weight:600;display:block}.chip:active{transform:translateY(1px)}.btn{justify-content:center;align-items:center;gap:var(--space-xs);min-height:2.5rem;padding:var(--space-xs) var(--space-lg);border-radius:var(--radius-sm);font-size:var(--text-sm);white-space:nowrap;transition:background var(--dur-micro) var(--ease-out), border-color var(--dur-micro) var(--ease-out), color var(--dur-micro) var(--ease-out), transform var(--dur-micro) var(--ease-out);font-weight:700;display:inline-flex}.btn:active{transform:translateY(1px)}.btn-primary{background:var(--color-accent);color:#fff;border:1px solid #0000}.btn-primary:hover{background:var(--color-accent-hover)}.btn-ghost{border:1px solid var(--color-border);color:var(--color-text);background:0 0}.btn-ghost:hover{border-color:var(--color-text);background:var(--color-surface-2)}.btn-plain{padding:var(--space-xs) var(--space-sm);color:var(--color-accent);font-weight:700}.btn-plain:hover{text-underline-offset:3px;text-decoration:underline}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-row{gap:var(--space-sm);flex-wrap:wrap;margin-block-start:var(--space-lg);display:flex}.btn-sm{min-height:2rem;padding:var(--space-2xs) var(--space-sm);font-size:var(--text-xs)}.panel{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md)}.panel-pad{padding:var(--space-lg)}.config-actions{z-index:2;padding:var(--space-md) 0 var(--space-lg);background:var(--color-surface-glass);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-block-start:1px solid var(--color-border);justify-content:flex-end;margin-block-start:var(--space-lg);display:flex;position:sticky;bottom:0}.empty-state{align-items:flex-start;gap:var(--space-md);padding:var(--space-lg);border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-surface);text-align:start;display:flex}.empty-state-icon{background:var(--color-success-bg);width:2.5rem;height:2.5rem;color:var(--color-success);border-radius:999px;flex:none;justify-content:center;align-items:center;display:inline-flex}.empty-state-title{font-family:var(--font-display);font-size:var(--text-md);letter-spacing:-.02em;color:var(--color-text);margin-block-end:var(--space-2xs);font-weight:600}.empty-state .btn-row{flex:none;margin-block-start:0}@media (width>=40rem){.empty-state .btn-row{margin-inline-start:auto}}.config-cta{width:100%}@media (width>=50rem){.config-cta{width:auto;min-width:16rem}}.seg{width:100%;border:1px solid var(--color-border);border-radius:var(--radius-sm);max-inline-size:24rem;display:flex;overflow:hidden}.seg-btn{justify-content:center;align-items:center;gap:var(--space-xs);min-width:0;min-height:2.5rem;padding:var(--space-2xs) var(--space-xs);font-size:var(--text-sm);color:var(--color-text-secondary);white-space:nowrap;transition:background var(--dur-micro) var(--ease-out), color var(--dur-micro) var(--ease-out);flex:1;font-weight:700;display:inline-flex}.seg-btn+.seg-btn{border-inline-start:1px solid var(--color-border)}.seg-btn:hover{background:var(--color-surface-2);color:var(--color-text)}.seg-btn[aria-pressed=true]{background:var(--color-text);color:var(--color-surface)}.grid-2,.grid-4{gap:var(--space-md);display:grid}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}@media (width<=50rem){.grid-2,.grid-4{grid-template-columns:1fr}}.chip-sub,.tag{font-family:var(--font-mono);font-size:var(--text-xs);letter-spacing:.06em;color:var(--color-text-muted);font-weight:600}.chapter-grid{gap:var(--space-sm);grid-template-columns:repeat(auto-fit,minmax(16rem,1fr));display:grid}.chip{align-items:flex-start;gap:var(--space-2xs);min-width:0;padding:var(--space-md);border-radius:var(--radius-sm);border:1px solid var(--color-border);background:var(--color-surface);text-align:start;transition:background var(--dur-micro) var(--ease-out), border-color var(--dur-micro) var(--ease-out), transform var(--dur-micro) var(--ease-out);flex-direction:column;display:flex}.chip:hover,.chip[data-active=true]{background:var(--color-surface-2);border-color:var(--color-accent)}.chip-title{font-family:var(--font-display);font-size:var(--text-md);letter-spacing:-.02em;color:var(--color-text);font-weight:600}.progress-wrap{align-items:center;gap:var(--space-sm);min-width:8rem;display:flex}.progress-track{background:var(--color-surface-2);border:1px solid var(--color-border);border-radius:999px;flex:auto;width:100%;min-width:0;height:6px;display:block;overflow:hidden}.progress-fill{background:var(--color-accent);height:100%;transition:width var(--dur-short) var(--ease-out);border-radius:999px;display:block}.progress-fill[data-tone=ok]{background:var(--color-success)}.progress-fill[data-tone=mid]{background:var(--color-accent)}.progress-fill[data-tone=low]{background:var(--color-error)}.progress-fill[data-tone=neutral]{background:var(--color-border)}.progress-pct{font-family:var(--font-mono);font-size:var(--text-xs);font-variant-numeric:tabular-nums;color:var(--color-text-muted)}@media (width<=40rem){.progress-wrap{width:100%;min-width:0}}.table{border-collapse:collapse;width:100%;font-size:var(--text-sm);border-block-start:1px solid var(--color-border)}.table th,.table td{padding:var(--space-sm);border-block-end:1px solid var(--color-border);vertical-align:top}.table th{font-family:var(--font-mono);font-size:var(--text-xs);color:var(--color-text-muted);text-align:start;font-weight:600}.table .num{text-align:end;font-variant-numeric:tabular-nums}@media (width<=40rem){.table thead{display:none}.table,.table tbody,.table tr,.table td{width:100%;display:block}.table tr{padding-block:var(--space-sm);padding-inline:var(--space-lg);border-block-end:1px solid var(--color-border)}.table td{justify-content:space-between;align-items:baseline;gap:var(--space-md);padding:var(--space-2xs) 0;border:0;display:flex}.table td:before{content:attr(data-label);font-family:var(--font-mono);font-size:var(--text-xs);color:var(--color-text-muted)}.table td[data-label=""]:before{content:none}}.muted{color:var(--color-text-muted)}.tag{padding:var(--space-2xs) var(--space-sm);border-radius:var(--radius-sm);border:1px solid var(--color-border);color:var(--color-text-muted);display:inline-block}.tag[data-kind=accent]{border-color:var(--color-accent);color:var(--color-accent)}@media (prefers-reduced-motion:reduce){.progress-fill{transition:none}}.text-sm{font-size:var(--text-sm)}.mt-0{margin-block-start:0}.mt-sm{margin-block-start:var(--space-sm)}.mb-sm{margin-block-end:var(--space-sm)}.mb-md{margin-block-end:var(--space-md)}.mb-lg{margin-block-end:var(--space-lg)}.mb-xl{margin-block-end:var(--space-xl)}.mx-auto{margin-inline:auto}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.clip{overflow:hidden}.minw-10{min-width:10rem}.text-md{font-size:var(--text-md)}.rail{gap:var(--space-lg);height:100dvh;padding:var(--space-lg) var(--space-md);background:var(--color-surface);border-inline-end:1px solid var(--color-border);flex-direction:column;display:flex;position:sticky;top:0;overflow-y:auto}.wordmark{font-family:var(--font-wordmark);font-size:var(--text-lg);letter-spacing:-.04em;color:var(--color-text);text-align:start;padding-inline:var(--space-sm);font-weight:600;line-height:1.05;text-decoration:none;display:block}.wordmark--compact{font-size:var(--text-base)}.logo{align-items:center;gap:var(--space-xs);display:inline-flex}.logo-text{font-family:var(--font-wordmark);letter-spacing:-.03em;font-weight:600}.wordmark small{font-family:var(--font-mono);font-size:var(--text-xs);letter-spacing:.08em;color:var(--color-accent);margin-block-start:var(--space-2xs);font-weight:600;display:block}.nav-group{border-block-start:1px solid var(--color-border);flex-direction:column;padding-block-start:var(--space-sm);display:flex}.nav-group-label{font-family:var(--font-mono);font-size:var(--text-xs);letter-spacing:.09em;text-transform:uppercase;color:var(--color-text-muted);padding-inline:var(--space-sm);padding-block-end:var(--space-xs);font-weight:600}.nav-item{align-items:baseline;gap:var(--space-sm);padding:var(--space-xs) var(--space-sm);color:var(--color-text-secondary);font-size:var(--text-sm);text-align:start;transition:background var(--dur-micro) var(--ease-out), color var(--dur-micro) var(--ease-out), transform var(--dur-micro) var(--ease-out);border-radius:0;display:flex}.nav-item:hover{background:var(--color-surface-2);color:var(--color-text)}.nav-item:active{transform:translateY(1px)}.nav-item[data-active=true]{background:var(--color-surface-2);color:var(--color-text);border-inline-start:2px solid var(--color-accent);padding-inline-start:calc(var(--space-sm) - 2px)}.nav-index{font-family:var(--font-mono);font-size:var(--text-sm);font-variant-numeric:tabular-nums;color:var(--color-text-secondary);min-width:1.5rem}.nav-item[data-active=true] .nav-index{color:var(--color-accent)}.rail-foot{padding-inline:var(--space-sm);font-family:var(--font-mono);font-size:var(--text-xs);color:var(--color-text-muted);margin-block-start:auto;line-height:1.5}.rail-foot button{color:inherit;text-underline-offset:2px;font-size:var(--text-xs);padding:var(--space-xs) var(--space-2xs);margin-inline-start:calc(-1 * var(--space-2xs));text-decoration:underline;display:block}.rail-foot .theme-toggle{align-items:center;gap:var(--space-xs);font-family:var(--font-body);color:var(--color-text-secondary);padding:var(--space-2xs) var(--space-sm);border-radius:var(--radius-sm);transition:color var(--dur-micro) var(--ease-out), background var(--dur-micro) var(--ease-out);margin-inline-start:0;font-weight:600;text-decoration:none;display:inline-flex}.rail-foot .theme-toggle:hover{color:var(--color-text);background:var(--color-surface-2)}.rail-foot .install-rail-item{align-items:center;gap:var(--space-xs);width:100%;font-family:var(--font-body);color:var(--color-accent);padding:var(--space-2xs) var(--space-sm);border-radius:var(--radius-sm);transition:color var(--dur-micro) var(--ease-out), background var(--dur-micro) var(--ease-out);margin-inline-start:0;font-weight:600;text-decoration:none;display:inline-flex}.rail-foot .install-rail-item:hover{color:var(--color-text);background:var(--color-surface-2)}.rail-foot button:hover{color:var(--color-text)}.topbar{z-index:var(--z-sticky-nav);justify-content:space-between;align-items:center;gap:var(--space-md);padding:var(--space-sm) var(--space-md);background:var(--color-surface-glass);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-block-end:1px solid var(--color-border);display:none;position:sticky;top:0}.burger{align-items:center;gap:var(--space-xs);font-size:var(--text-sm);color:var(--color-text);min-height:2.75rem;padding-inline:var(--space-xs);white-space:nowrap;margin-inline-start:calc(-1 * var(--space-xs));font-weight:600;display:inline-flex}.install-header-btn{align-items:center;gap:var(--space-xs);min-height:2.25rem;padding-inline:var(--space-sm);font-size:var(--text-sm);color:var(--color-text-secondary);border:1px solid var(--color-border);border-radius:var(--radius-sm);white-space:nowrap;transition:color var(--dur-micro) var(--ease-out), background var(--dur-micro) var(--ease-out), border-color var(--dur-micro) var(--ease-out);font-weight:600;display:inline-flex}.install-header-btn:hover{color:var(--color-text);background:var(--color-surface-2);border-color:var(--color-accent)}@media (width<=60rem){.rail{z-index:var(--z-sheet);width:min(78vw,16rem);box-shadow:var(--shadow-sm);transition:transform var(--dur-short) var(--ease-out);position:fixed;inset:0 auto 0 0;transform:translate(-101%)}.rail[data-open=true]{transform:translate(0)}.topbar{display:flex}.guide-banner{top:var(--topbar-height)}.scrim{z-index:calc(var(--z-sheet) - 1);background:var(--color-scrim);animation:scrim-in var(--dur-short) var(--ease-out);position:fixed;inset:0}@keyframes scrim-in{0%{opacity:0}to{opacity:1}}}.guide-banner{z-index:var(--z-sticky);justify-content:space-between;align-items:center;gap:var(--space-md);padding:var(--space-sm) var(--space-md);border:1px solid var(--color-success);border-radius:var(--radius-sm);background:var(--color-success-bg);color:var(--color-success-ink);margin-block-end:var(--space-lg);font-weight:600;transition:border-color .15s;display:flex;position:sticky;top:0}.guide-banner:hover{border-color:var(--color-success-ink)}.guide-banner-main{min-width:0}.guide-banner-tag{border:1px solid var(--color-success);border-radius:var(--radius-sm);font-family:var(--font-mono);font-size:var(--text-xs);letter-spacing:.04em;text-transform:uppercase;white-space:nowrap;flex-shrink:0;padding:.15rem .5rem;font-weight:700}.option:active{transform:translateY(1px)}.opt-key{font-family:var(--font-mono);font-size:var(--text-sm);font-variant-numeric:tabular-nums;color:var(--color-text-secondary);min-width:1.5rem}@media (width<=60rem){.timer-bar{top:var(--topbar-height)}}.timer{font-family:var(--font-mono);font-variant-numeric:tabular-nums}.quiz-meta{font-family:var(--font-mono);font-size:var(--text-xs);letter-spacing:.06em;color:var(--color-text-muted);font-weight:600}.quiz-head{justify-content:space-between;align-items:baseline;gap:var(--space-md);border-block-end:1px solid var(--color-border);flex-wrap:wrap;margin-block-end:var(--space-lg);padding-block-end:var(--space-sm);display:flex}.q-text{font-family:var(--font-display);font-size:var(--text-lg);letter-spacing:-.025em;margin-block-end:var(--space-lg);font-weight:600;line-height:1.25}.option-list{border-block-start:1px solid var(--color-border);margin:0;padding:0;list-style:none}.option{align-items:baseline;gap:var(--space-md);width:100%;padding:var(--space-sm) var(--space-xs);text-align:start;border-block-end:1px solid var(--color-border);font-size:var(--text-base);transition:background var(--dur-micro) var(--ease-out), color var(--dur-micro) var(--ease-out), box-shadow var(--dur-short) var(--ease-out), transform var(--dur-micro) var(--ease-out);display:flex}.option:hover:not(:disabled){background:var(--color-surface-2)}.option:disabled{cursor:default}.option[data-state=selected]{background:var(--color-accent-subtle);box-shadow:inset 3px 0 0 var(--color-accent)}.option[data-state=selected] .opt-key{color:var(--color-accent)}.option[data-state=correct]{color:var(--color-success-ink);box-shadow:inset 3px 0 0 var(--color-success)}.option[data-state=wrong]{color:var(--color-error-ink);box-shadow:inset 3px 0 0 var(--color-error)}.feedback{align-items:baseline;gap:var(--space-sm);padding:var(--space-sm) var(--space-md);border-radius:var(--radius-sm);font-size:var(--text-sm);animation:feedback-in var(--dur-short) var(--ease-out);margin-block-start:var(--space-md);display:flex}@keyframes feedback-in{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.feedback[data-kind=ok]{background:var(--color-success-bg);color:var(--color-success-ink)}.feedback[data-kind=ko]{background:var(--color-error-bg);color:var(--color-error-ink)}.explanation{border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface-2);color:var(--color-text-secondary);animation:explanation-pulse var(--dur-long) var(--ease-out);margin-block-start:var(--space-md)}@keyframes explanation-pulse{0%{border-color:var(--color-accent)}to{border-color:var(--color-border)}}.explanation-toggle{align-items:center;gap:var(--space-xs);width:100%;padding:var(--space-sm) var(--space-md);color:var(--color-text);cursor:pointer;text-align:left;transition:color var(--dur-micro) var(--ease-out);font-weight:700;display:flex}.explanation-toggle:hover{color:var(--color-accent)}.explanation-toggle:active{transform:translateY(1px)}.explanation-chevron{transition:transform var(--dur-short) var(--ease-out);flex-shrink:0;margin-inline-start:auto}.explanation.open .explanation-chevron{transform:rotate(180deg)}.explanation-body{transition:grid-template-rows var(--dur-short) var(--ease-out);grid-template-rows:0fr;display:grid}.explanation.open .explanation-body{grid-template-rows:1fr}.explanation-body>p{padding:0 var(--space-md) var(--space-sm);min-height:0;margin-block:0;line-height:1.6;overflow:hidden}.question-tools{gap:var(--space-sm);border-block-start:1px solid var(--color-border);flex-direction:column;margin-block-start:var(--space-lg);padding-block-start:var(--space-md);display:flex}.question-tools-row{gap:var(--space-sm);flex-wrap:wrap;display:flex}.flag-btn:disabled{cursor:default;opacity:.7}.flag-btn:disabled:hover{border-color:var(--color-border)}.flag-btn{padding:var(--space-2xs) var(--space-sm);border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface);color:var(--color-text-muted);font-size:var(--text-sm);cursor:pointer;align-self:flex-start;align-items:center;gap:.45rem;transition:border-color .15s,color 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var(--color-border);border-radius:var(--radius-md);background:var(--color-surface);color:var(--color-text-secondary);text-align:start;cursor:pointer;flex-wrap:wrap;margin-block-end:var(--space-xl);transition:border-color .15s;display:flex}.review-banner:hover{border-color:var(--color-accent)}.review-banner-main{flex-direction:column;gap:.15rem;display:flex}.review-banner-count{font-weight:700;font-size:var(--text-md);color:var(--color-text-secondary)}.review-banner--guide{background:var(--color-surface);border-color:var(--color-border);color:var(--color-text-secondary)}.review-banner--guide .muted{color:var(--color-text-muted)}.timer-bar{z-index:var(--z-sticky);justify-content:space-between;align-items:center;gap:var(--space-md);padding-block:var(--space-sm);background:var(--color-surface-glass);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-block-end:1px solid var(--color-border);margin-block-end:var(--space-lg);display:flex;position:sticky;top:0}.timer{font-size:var(--text-md);color:var(--color-text);font-weight:600}.timer[data-low=true]{color:var(--color-error)}.timer[data-paused=true]{opacity:.55}.exam-progress{width:min(100%,24rem)}.guia-qa{padding:var(--space-md);border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface)}.guia-question .q-text{font-size:var(--text-base);margin-block-end:var(--space-sm);font-weight:600}.guia-question .option-list{margin-block-end:var(--space-sm)}.guia-question .option{cursor:default}.guia-question .option:hover:not(:disabled){background:0 0}.guia-qa-text{font-size:var(--text-sm);color:var(--color-text-secondary);margin-block-end:0;line-height:1.6}.figure-wrap{margin-block-end:var(--space-lg)}.figure-card{padding:var(--space-sm);border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface-2);display:block}.figure-card img{max-width:100%;height:auto;transition:transform var(--dur-short) var(--ease-out);margin-inline:auto}.figure-card:hover img{transform:scale(1.015)}.figure-card figcaption{font-family:var(--font-mono);font-size:var(--text-xs);color:var(--color-text-muted);text-align:center;margin-block-start:var(--space-sm)}.lightbox{z-index:var(--z-sheet);padding:var(--space-lg);background:var(--color-scrim-deep);animation:lightbox-in var(--dur-short) var(--ease-out);overscroll-behavior:contain;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}@keyframes lightbox-in{0%{opacity:0}to{opacity:1}}.lightbox figure{max-width:min(92vw,68rem);max-height:92dvh}.lightbox img{border-radius:var(--radius-sm);width:auto;max-width:100%;height:auto;max-height:84dvh;animation:lightbox-img-in var(--dur-long) var(--ease-out)}@keyframes lightbox-img-in{0%{opacity:0;transform:scale(.92)}to{opacity:1;transform:scale(1)}}.lightbox figcaption{justify-content:center;align-items:center;gap:var(--space-sm);color:var(--color-scrim-text);font-size:var(--text-sm);text-align:center;margin-block-start:var(--space-sm);display:flex}.lightbox-close{align-items:center;gap:var(--space-2xs);padding:var(--space-2xs) var(--space-xs);color:var(--color-scrim-text);font-size:var(--text-xs);border:1px solid #ffffff59;border-radius:999px;display:inline-flex}.lightbox-close:hover,.lightbox-close:focus-visible{background:#ffffff24}.toc-item{align-items:baseline;gap:var(--space-sm);padding:var(--space-xs) var(--space-sm);color:var(--color-text-secondary);font-size:var(--text-sm);text-align:start;transition:background var(--dur-micro) var(--ease-out), color var(--dur-micro) var(--ease-out), transform var(--dur-micro) 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var(--space-md);grid-template-columns:repeat(auto-fit,minmax(9.5rem,1fr));margin-block-end:var(--space-lg);display:grid}.stat-instrument{align-items:center;gap:var(--space-sm);text-align:center;flex-direction:column;display:flex}.stat-gauge{place-items:center;width:100%;height:8.75rem;display:grid}.gauge{--gauge-ink:var(--color-accent);width:100%;max-width:8.75rem;height:auto;overflow:visible}.gauge[data-tone=ok]{--gauge-ink:var(--color-success-ink)}.gauge[data-tone=mid]{--gauge-ink:var(--color-accent)}.gauge[data-tone=low]{--gauge-ink:var(--color-error-ink)}.gauge[data-tone=empty]{--gauge-ink:var(--color-text-muted)}.gauge text{font-family:var(--font-mono);font-variant-numeric:tabular-nums}.gauge-face{fill:var(--color-surface-2)}.gauge-ring{fill:none;stroke:var(--color-text);stroke-width:2.5px}.gauge-ring-2{fill:none;stroke:var(--color-border);stroke-width:1px}.gauge-tick{stroke:var(--color-text-secondary);stroke-width:1px;stroke-linecap:round}.gauge-tick[data-major=true]{stroke:var(--color-text);stroke-width:2px}.gauge-num{fill:var(--color-text-muted);font-size:5px;font-weight:600}.gauge-zone{stroke:var(--color-success);opacity:.16;transition:opacity var(--dur-short) var(--ease-out)}.gauge[data-tone=empty] .gauge-zone{opacity:.06}.gauge-bug{stroke:var(--color-accent);stroke-width:2px;stroke-linecap:round}.gauge-needle{fill:var(--gauge-ink);color:var(--color-text)}.gauge-pivot{fill:var(--color-surface);stroke:var(--color-text);stroke-width:1.5px}.gauge-pivot-core{fill:var(--color-text)}.gauge-plate{fill:var(--color-surface-2);stroke:var(--color-border)}.gauge-value{fill:var(--gauge-ink);letter-spacing:-.03em;font-size:21px;font-weight:700}.gauge-empty{fill:var(--color-text-muted);letter-spacing:.06em;font-size:9px;font-weight:600}.gauge[data-type=circle] .gauge-value{font-size:11.5px}.stat-instrument:hover .gauge-zone{opacity:.3}.inst-fuel{align-items:center;gap:var(--space-sm);flex-direction:column;width:100%;max-width:8.75rem;display:flex}.inst-fuel-track{border:1px solid var(--color-border);background:var(--color-surface-2);border-radius:6px;width:100%;height:.7rem;position:relative;overflow:hidden}.inst-fuel-track:before{content:"";background-image:repeating-linear-gradient(90deg, 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textarea{padding:var(--space-sm);border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface);color:var(--color-text);font:inherit;font-size:var(--text-sm);resize:vertical;line-height:1.5}.note-box textarea:focus{outline:2px solid var(--color-accent);outline-offset:1px}.note-box select{padding:var(--space-sm);border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface);color:var(--color-text);font:inherit;font-size:var(--text-sm)}.fab{z-index:var(--z-sheet);right:clamp(1rem,4vw,2.5rem);bottom:max(clamp(1rem, 4vw, 2rem), env(safe-area-inset-bottom));align-items:center;gap:var(--space-xs);padding:var(--space-sm) var(--space-md);background:var(--color-text);color:var(--color-bg);font-family:var(--font-display);font-size:var(--text-base);box-shadow:var(--shadow-sm), 0 6px 18px #00000040;transition:transform var(--dur-micro) var(--ease-out), background var(--dur-micro) 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var(--color-accent);outline-offset:1px}.note-editor-actions{justify-content:space-between;align-items:center;gap:var(--space-sm);flex-wrap:wrap;display:flex}.note-link-chip{font-family:var(--font-mono);font-size:var(--text-xs);letter-spacing:.06em;text-transform:uppercase;color:var(--color-accent);font-weight:600}.tag-input{gap:var(--space-2xs);flex-direction:column;display:flex}.tag-chips{align-items:center;gap:var(--space-2xs);flex-wrap:wrap;display:flex}.tag-chip{align-items:center;gap:var(--space-xs);background:var(--color-accent-subtle);color:var(--color-accent);font-family:var(--font-mono);font-size:var(--text-xs);border-radius:999px;padding:.2rem 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var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface-2);color:var(--color-text-secondary);font-size:var(--text-sm);margin-block-start:var(--space-sm)}.tag-chip--active{align-items:center;gap:var(--space-2xs);background:var(--color-accent-subtle);color:var(--color-accent);cursor:pointer;display:inline-flex}.tag-chip--active:hover{background:var(--color-accent-hover)}.note-card-head{justify-content:space-between;align-items:center;gap:var(--space-2xs);flex-wrap:wrap;display:flex}.note-card-text{white-space:pre-wrap;overflow-wrap:anywhere;margin-block-end:var(--space-sm)}.note-card-textarea{width:100%;padding:var(--space-sm);border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface);color:var(--color-text);font:inherit;font-size:var(--text-sm);resize:vertical;margin-block-start:var(--space-sm);line-height:1.5}.note-card-textarea:focus{outline:2px solid var(--color-accent);outline-offset:1px}.note-card-actions{gap:var(--space-2xs);flex-wrap:wrap;display:flex}.note-card--pinned{border-color:var(--color-accent);background:var(--color-surface)}.install{align-items:flex-start;gap:var(--space-2xs);flex-direction:column;margin-block-start:var(--space-sm);display:flex}.install-hint{font-size:var(--text-xs);color:var(--color-text-muted);max-width:45ch}.install-banner{justify-content:space-between;align-items:center;gap:var(--space-md);padding:var(--space-md) var(--space-lg);border:1px solid var(--color-border);border-block-start:2px solid var(--color-accent);border-radius:var(--radius-md);background:var(--color-surface);flex-wrap:wrap;margin-block-end:var(--space-xl);display:flex}.install-banner-main{max-width:46ch}.install-banner-title{margin:0 0 var(--space-2xs);font-weight:700;font-size:var(--text-md);color:var(--color-text)}.install-banner-sub{margin:0}.install-banner-guide{font-size:var(--text-xs);color:var(--color-text-muted);margin-block-start:var(--space-sm);margin-block-end:0}.install-banner-actions{margin-block-start:var(--space-sm);margin-inline-start:auto}.result-score{font-family:var(--font-mono);font-variant-numeric:tabular-nums}.footer-label{font-family:var(--font-mono);font-size:var(--text-xs);letter-spacing:.06em;color:var(--color-text-muted);font-weight:600}.loading,.result-banner{padding-block:var(--space-3xl);text-align:center;position:relative}.stamp{z-index:1;border:2px solid var(--color-success);color:var(--color-success);font-family:var(--font-mono);text-transform:uppercase;letter-spacing:.06em;opacity:0;border-radius:6px;flex-direction:column;justify-content:center;align-items:center;gap:.12rem;padding:.65rem 1.35rem;font-weight:700;animation:.7s cubic-bezier(.16,1,.3,1) .35s forwards stamp-in;display:flex;position:absolute;top:1.25rem;right:0;transform:rotate(-8deg)scale(.6)}.stamp:after{content:"";pointer-events:none;border:2px solid;border-radius:4px;position:absolute;inset:.32rem}.stamp--fail{border-color:var(--color-error);color:var(--color-error)}.stamp-ring{letter-spacing:.24em;font-size:.62rem}.stamp-result{letter-spacing:.04em;font-size:1.4rem;line-height:1}.stamp-sub{letter-spacing:.16em;font-size:.62rem}@keyframes stamp-in{to{opacity:1;transform:rotate(-8deg)scale(1)}}@media (prefers-reduced-motion:reduce){.stamp{opacity:1;animation:none;transform:rotate(-8deg)}}.loading{color:var(--color-text-muted)}.result-score{font-size:var(--text-display);letter-spacing:-.02em;animation:result-score-in var(--dur-long) var(--ease-out);font-weight:600}@keyframes result-score-in{0%{opacity:0;transform:scale(.85)}to{opacity:1;transform:scale(1)}}.streak-line{color:var(--color-text-muted);margin-block-start:var(--space-md);font-weight:600}.streak-line[data-live=true]{color:var(--color-accent)}.error-box{padding:var(--space-lg);border:1px solid var(--color-error);border-radius:var(--radius-sm);background:var(--color-error-bg);color:var(--color-error-ink)}.site-footer{max-width:60rem;margin:var(--space-2xl) auto 0;border-block-start:1px solid var(--color-border);color:var(--color-text-muted);font-size:var(--text-sm);gap:var(--space-2xs);flex-direction:column;padding-block-start:var(--space-md);line-height:1.7;display:flex}.torre-memo{align-items:center;gap:var(--space-sm) var(--space-md);font-family:var(--font-mono);font-size:var(--text-xs);color:var(--color-text-secondary);flex-wrap:wrap;display:flex}.torre-memo-text{min-width:16rem;transition:opacity var(--dur-short) var(--ease-out);flex:1 1 0;font-style:italic;display:block}.torre-memo-cat{letter-spacing:.12em;text-transform:uppercase;color:var(--color-text-muted);margin-block-end:var(--space-2xs);font-size:.625rem;font-style:normal;font-weight:600;display:block}.torre-squawk{border:1px solid var(--color-border);letter-spacing:.1em;white-space:nowrap;border-radius:999px;align-items:center;gap:.35rem;padding:.1rem .5rem;font-size:.625rem;display:inline-flex}.torre-squawk-icon{width:.7rem;height:.7rem;color:var(--color-text-muted);flex-shrink:0}.torre-tower{width:1.35rem;height:1.95rem;color:var(--color-text-muted);animation:4.5s ease-in-out infinite torre-glow}@keyframes torre-glow{0%,to{filter:drop-shadow(0 0 4px color-mix(in srgb, var(--color-accent) 45%, transparent))}50%{filter:drop-shadow(0 0 12px color-mix(in srgb, var(--color-accent) 85%, transparent))}}@media (prefers-reduced-motion:reduce){.torre-tower{filter:drop-shadow(0 0 6px color-mix(in srgb, var(--color-accent) 65%, transparent));animation:none}}.site-footer .footer-label{color:var(--color-text-placeholder);margin-block-start:var(--space-xl)}.site-footer p{max-width:42rem;color:var(--color-text-placeholder)}.site-footer a,.site-footer strong{color:var(--color-text-placeholder)}.site-footer strong{font-weight:500}.site-footer a{text-underline-offset:2px;text-decoration:underline}@media (prefers-reduced-motion:reduce){*,:before,:after{transition:none!important;animation:none!important}}