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.pos{border-color:var(--danger-mid);background:var(--danger-pos);color:var(--danger)}.answer.pending{border-color:var(--ans-pending-border);color:var(--ink);background:var(--ans-pending-fill)}.answer:disabled{cursor:default}.next-row{justify-content:stretch;margin-top:.9rem;display:flex}.btn-next{width:100%;min-height:3rem;font-size:1.05rem}.hint-block{gap:.65rem;margin-top:.75rem;display:grid}.hint-actions{gap:.5rem;display:grid}@media(min-width:520px){.hint-actions{grid-template-columns:repeat(2,minmax(0,1fr))}}.btn-hint{border:1px solid var(--line);background:var(--surface-2);width:100%;min-height:2.75rem;color:var(--ink);box-shadow:none;cursor:pointer;border-radius:.75rem;font-weight:700}.btn-hint:hover{border-color:var(--line-strong);background:var(--fill-press)}.btn-hint.on{border-color:var(--ok-mid);background:var(--accent-soft);color:var(--accent)}.btn-ai-hint.on{border-color:var(--ai,#3b6ea5)}@supports (color:color-mix(in lab,red,red)){.btn-ai-hint.on{border-color:color-mix(in srgb,var(--ai,#3b6ea5) 35%,var(--line))}}.btn-ai-hint.on{background:var(--ai-bg,#eef3fb);color:var(--ai,#3b6ea5)}.btn-ai-hint:disabled{cursor:wait;opacity:.7}.hint-text{border:1px solid var(--hint-border);background:var(--hint);color:var(--muted);overflow-wrap:anywhere;border-radius:.75rem;margin:0;padding:.75rem .9rem;font-size:1.02rem;line-height:1.4}.hint-text.ai-tip{border-color:var(--ai,#3b6ea5)}@supports (color:color-mix(in lab,red,red)){.hint-text.ai-tip{border-color:color-mix(in srgb,var(--ai,#3b6ea5) 30%,var(--line))}}.hint-text.ai-tip{background:var(--ai-bg,#eef3fb)}@supports (color:color-mix(in lab,red,red)){.hint-text.ai-tip{background:color-mix(in srgb,var(--ai-bg,#eef3fb) 70%,white)}}.feedback{border-top:1px solid var(--line);margin-top:1.1rem;padding-top:1rem}.feedback-verdict{margin-bottom:.25rem;font-size:1.05rem;display:block}.feedback-verdict.ok{color:var(--ok)}.feedback-verdict.bad{color:var(--danger)}.feedback-verdict.sync{color:var(--muted);font-weight:600}.hint-text.tip-linked a,.feedback .tip a{color:var(--accent);text-underline-offset:2px;font-weight:600;text-decoration:underline}.nav-chip{border:1px solid var(--line);background:var(--surface);min-width:2.25rem;height:2.25rem;font-family:var(--mono);color:var(--ink);border-radius:10px;justify-content:center;align-items:center;padding:0 .5rem;font-size:.82rem;font-weight:500;display:inline-flex}.nav-chip.active{border-color:var(--accent);background:var(--accent);color:#fff}.nav-chip.ok{border-color:var(--ok-mid);background:var(--ok-soft)}.nav-chip.bad{border-color:var(--danger-mid);background:var(--danger-soft)}.nav-chip.active.ok,.nav-chip.active.bad{border-color:var(--accent);background:var(--accent);color:#fff}@media(max-width:640px){.q-image{max-height:min(280px,38vh)}.btn-next{bottom:calc(8px + var(--safe-bottom));z-index:5;position:sticky}.quiz-panel{padding-top:.75rem}.quiz-head{border-bottom:1px solid var(--line);flex-wrap:nowrap;gap:.5rem;margin-top:0;margin-bottom:.9rem;padding-bottom:.75rem}.quiz-head-mobile{flex:1;align-items:center;gap:.5rem;min-width:0;display:flex}.quiz-head-label{display:none!important}.quiz-head-right{flex-shrink:0}.question-text{margin-top:.15rem}.answer{gap:.65rem;min-height:48px;padding:.75rem .9rem;font-size:1.02rem}.answer .pos{width:1.55rem;height:1.55rem;font-size:.8rem}}.nav-strip{z-index:20;background:var(--surface);border:1px solid var(--line);box-shadow:none;border-radius:12px;margin-bottom:12px;padding:12px;position:sticky;top:0}.quiz-toolbar-desktop{border-bottom:1px solid var(--line);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;margin-bottom:8px;padding-bottom:8px;display:flex}.quiz-toolbar-end{flex-wrap:wrap;align-items:center;gap:8px;margin-left:auto;display:flex}.quiz-where{min-width:0;color:var(--ink);flex-wrap:wrap;align-items:baseline;gap:4px 0;font-size:1.02rem;font-weight:700;line-height:1.25;display:flex}.quiz-where-title{font-size:inherit;font-weight:inherit;color:inherit}.quiz-where-sub,.quiz-where-hint{color:var(--muted);font-size:.85rem;font-weight:500}.quiz-where-sub:before,.quiz-where-hint:before{content:"·";color:var(--line-strong);margin:0 8px;font-weight:600}.quiz-back{background:var(--accent);border:1px solid var(--accent);color:#fff;white-space:nowrap;cursor:pointer;border-radius:10px;justify-content:center;align-items:center;min-height:40px;padding:8px 14px;font-size:.95rem;font-weight:700;text-decoration:none;display:inline-flex}.quiz-back:hover{filter:brightness(1.05);color:#fff;text-decoration:none}.nav-strip-row{grid-template-columns:repeat(20,minmax(0,1fr));gap:4px;display:grid}.nav-strip-row.is-flexible{grid-template-columns:repeat(auto-fill,minmax(36px,1fr))}.nav-chip{box-sizing:border-box;border:1px solid var(--line);width:100%;height:32px;min-height:32px;font-family:var(--mono);color:var(--ink);cursor:pointer;background:#f7f9fc;border-radius:8px;place-items:center;padding:0;font-size:.72rem;font-weight:500;line-height:1;text-decoration:none;display:grid}.nav-chip:hover{border-color:var(--line-hover);color:var(--ink);text-decoration:none}.nav-chip.active{background:var(--accent);border-color:var(--accent);color:#fff}.nav-chip.ok{background:var(--ok-soft);border-color:var(--ok-mid)}.nav-chip.bad{background:var(--danger-soft);border-color:var(--danger-mid)}.nav-chip.done:not(.active){border-color:#7bc9ab}.nav-chip.active.ok,.nav-chip.active.bad{color:#fff;background:var(--accent);border-color:var(--accent)}.quiz-mobile-timer{font-family:var(--mono);flex-shrink:0;font-size:.82rem;font-weight:600;display:none}.marathon-nav-controls{flex-wrap:wrap;align-items:center;gap:8px;margin-left:auto;display:flex}.marathon-progress-label{text-align:center;min-width:4.5rem;font-family:var(--mono);font-size:.95rem;font-weight:600}.marathon-step{min-width:36px;min-height:36px;padding:6px 10px;font-weight:700}.marathon-step:disabled{cursor:default;opacity:.4}.marathon-nav .quiz-toolbar-desktop{border-bottom:0;margin-bottom:0;padding-bottom:0}.quiz-mobile-line,.marathon-mobile-line,.quiz-back-icon{display:none}.quiz-back-icon{border:1px solid var(--line);background:var(--surface-2);width:40px;height:40px;color:var(--ink);border-radius:12px;flex-shrink:0;place-items:center;font-size:1.1rem;text-decoration:none}.nav-strip-toggle{background:var(--surface-2);min-width:0;min-height:40px;color:var(--ink);cursor:pointer;border:1px solid #0000;border-radius:12px;flex:1;align-items:center;gap:8px;padding:0 10px 0 12px;font-size:.9rem;font-weight:600;display:none}.nav-strip-toggle-meta{color:var(--muted);text-overflow:ellipsis;white-space:nowrap;min-width:0;font-size:.84rem;font-weight:600;overflow:hidden}.nav-strip-toggle-progress{font-family:var(--mono);color:var(--accent);flex-shrink:0;font-size:.82rem;font-weight:600}.nav-error-dot{background:#e8a39b;border-radius:50%;flex-shrink:0;width:8px;height:8px;box-shadow:0 0 0 3px #c23b2e1f}.nav-strip-toggle.has-errors{border-color:#f0cfc9}.nav-strip-chevron{width:18px;height:18px;color:var(--muted);flex-shrink:0;place-items:center;margin-left:auto;transition:transform .2s,color .15s;display:grid}.nav-strip-toggle.is-open{background:var(--accent-soft);border-color:#c5e6d6}.nav-strip-toggle.is-open .nav-strip-chevron{color:var(--accent);transform:rotate(180deg)}.quiz-head-mobile,.quiz-icon-btn{display:none}.quiz-icon-btn{border:1px solid var(--line);background:var(--surface-2);width:40px;height:40px;color:var(--ink);cursor:pointer;border-radius:12px;flex-shrink:0;place-items:center;text-decoration:none}.image-zoom-dialog{color:#fff;background:#0a0e14f0;border:0;width:100vw;max-width:100vw;height:100dvh;max-height:100dvh;margin:0;padding:0;overflow:hidden}.image-zoom-dialog::backdrop{background:#0a0e14e0}.image-zoom-dialog[open]{place-items:center;display:grid}.image-zoom-dialog img{object-fit:contain;touch-action:pinch-zoom;-webkit-user-select:none;user-select:none;-webkit-user-drag:none;background:0 0;border-radius:12px;width:auto;max-width:min(100vw,100%);height:auto;max-height:min(100dvh,100vh);display:block}@media(max-width:640px){.quiz-toolbar-desktop,.nav-strip:not(.is-open){display:none!important}.nav-strip.is-open{z-index:40;max-height:calc(100vh - 24px);display:block;position:fixed;top:12px;left:12px;right:12px;overflow:auto}.nav-strip.is-open>.nav-strip-row{flex-wrap:nowrap;grid-template-columns:none;gap:6px;display:flex;overflow-x:auto}.nav-strip.is-open>.nav-strip-row .nav-chip{flex:0 0 36px;width:36px;min-width:36px}.quiz-head-mobile{flex:1;align-items:center;gap:8px;min-width:0;display:flex}.nav-strip-toggle{display:flex}.quiz-icon-btn{display:grid}.quiz-head-label{display:none!important}.quiz-mobile-timer{align-items:center;display:inline-flex}.marathon-nav .quiz-toolbar-desktop{display:none!important}.marathon-nav{display:block!important}.quiz-mobile-line,.marathon-mobile-line{align-items:center;gap:8px;width:100%;display:flex}.quiz-back-icon{margin-left:auto;display:grid}}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-leading{syntax:"*";inherits:false}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-tracking{syntax:"*";inherits:false}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}