:root{--color-primary:#f5a623;--color-primary-dim:#f5a62326;--color-primary-bg:#f5a62314;--color-success:#2ecc71;--color-success-bg:#2ecc711f;--color-success-dim:#2ecc7140;--color-error:#e74c3c;--color-error-bg:#e74c3c1f;--color-error-dim:#e74c3c40;--color-bg:#0c0f14;--color-surface:#151921;--color-card:#1a1f2b;--color-card-hover:#212838;--color-card-active:#252d3a;--color-text-primary:#f0f0f2;--color-text-secondary:#6b7280;--color-text-tertiary:#4b5563;--color-border:#ffffff0f;--color-border-subtle:#ffffff08;--color-glow:#f5a62314;--font:"Manrope", system-ui, -apple-system, sans-serif;--radius-sm:10px;--radius-md:14px;--radius-lg:20px;--radius-xl:24px;--shadow-card:0 1px 3px #0000004d, 0 0 0 1px #ffffff08;--shadow-elevated:0 8px 32px #0006, 0 0 0 1px #ffffff0a}[data-theme=light]{--color-bg:#f4f5f7;--color-surface:#edeef1;--color-card:#fff;--color-card-hover:#f8f8fa;--color-card-active:#f0f0f3;--color-text-primary:#1a1a2e;--color-text-secondary:#8c8c9e;--color-text-tertiary:#b0b0be;--color-border:#0000000f;--color-border-subtle:#00000008;--color-glow:#f5a6230f;--color-primary-dim:#f5a6231f;--shadow-card:0 1px 3px #0000000f, 0 0 0 1px #0000000a;--shadow-elevated:0 8px 32px #00000014, 0 0 0 1px #0000000d}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;margin:0;padding:0}html,body{height:100%}body{font-family:var(--font);background:var(--color-bg);color:var(--color-text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-webkit-text-size-adjust:100%;letter-spacing:-.01em;overflow:hidden}#root{height:100%}a{color:inherit;text-decoration:none}button{letter-spacing:inherit;font-family:inherit}img{max-width:100%;height:auto;display:block}::-webkit-scrollbar{width:0;display:none}.page{padding:calc(env(safe-area-inset-top,16px) + 16px) 20px 24px;animation:.35s ease-out pageIn}.page-standalone{-webkit-overflow-scrolling:touch;height:100dvh;overflow-y:auto}@keyframes pageIn{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.page-header{margin-bottom:24px}.page-header h1{letter-spacing:-.04em;background:linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-text-secondary) 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;margin:0;font-size:26px;font-weight:800}.page-subtitle{color:var(--color-text-tertiary);letter-spacing:.02em;text-transform:uppercase;margin:6px 0 0;font-size:13px;font-weight:500}.back-btn{color:var(--color-primary);cursor:pointer;letter-spacing:-.01em;background:0 0;border:none;align-items:center;gap:4px;margin-bottom:12px;padding:6px 0;font-size:15px;font-weight:600;display:flex}.back-btn svg{width:18px;height:18px}.next-btn{background:var(--color-primary);color:#0c0f14;border-radius:var(--radius-md);letter-spacing:-.02em;cursor:pointer;border:none;width:100%;margin-top:20px;padding:16px;font-size:16px;font-weight:700;transition:transform .15s,opacity .15s;display:block;box-shadow:0 4px 20px #f5a6234d}.next-btn:active{opacity:.9;transform:scale(.97)}.settings-section{margin-bottom:28px}.settings-title{color:var(--color-text-tertiary);text-transform:uppercase;letter-spacing:.06em;margin:0 0 10px;font-size:12px;font-weight:700}.settings-options{gap:8px;display:flex}.settings-option{border:1.5px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-card);color:var(--color-text-secondary);cursor:pointer;box-shadow:var(--shadow-card);flex:1;padding:12px;font-size:14px;font-weight:600;transition:all .25s}.settings-option.active{border-color:var(--color-primary);color:var(--color-primary);background:var(--color-primary-dim);box-shadow:0 0 0 1px var(--color-primary-dim)}.reset-btn{background:var(--color-error-bg);width:100%;color:var(--color-error);border-radius:var(--radius-md);cursor:pointer;border:1px solid #e74c3c26;padding:16px;font-size:15px;font-weight:700;transition:transform .12s,opacity .2s}.reset-btn:active{opacity:.8;transform:scale(.97)}.settings-about{text-align:center;color:var(--color-text-tertiary);border-top:1px solid var(--color-border);margin-top:40px;padding:20px;font-size:12px;font-weight:500}.settings-about p{margin:3px 0}.settings-about p:first-child{color:var(--color-text-secondary);font-size:13px;font-weight:700}.layout{flex-direction:column;height:100vh;display:flex}.layout-content{-webkit-overflow-scrolling:touch;flex:1;overflow-y:auto}.tab-bar{background:linear-gradient(to top, var(--color-bg) 60%, transparent);padding:0 12px calc(8px + env(safe-area-inset-bottom,0px)) 12px;z-index:100;position:sticky;bottom:0}.tab-bar-inner{background:var(--color-card);border:1px solid var(--color-border);box-shadow:var(--shadow-elevated);border-radius:20px;justify-content:space-around;align-items:center;padding:6px 4px;display:flex}.tab-item{color:var(--color-text-tertiary);letter-spacing:.01em;border-radius:14px;flex-direction:column;align-items:center;gap:3px;min-width:56px;padding:8px 12px 6px;font-size:10px;font-weight:600;text-decoration:none;transition:all .25s;display:flex;position:relative}.tab-item.tab-active{color:var(--color-primary);background:var(--color-primary-dim)}.tab-icon{justify-content:center;align-items:center;width:22px;height:22px;display:flex}.tab-icon svg{width:20px;height:20px}.tab-label{line-height:1}.progress-ring-wrap{flex-shrink:0;position:relative}.progress-ring{display:block;transform:rotate(-90deg)}.progress-ring-bg{fill:none;stroke:var(--color-border)}.progress-ring-fill{fill:none;stroke:var(--color-primary);stroke-linecap:round;transition:stroke-dashoffset .6s cubic-bezier(.4,0,.2,1)}.progress-ring-text{color:var(--color-text-secondary);letter-spacing:-.02em;justify-content:center;align-items:center;font-size:11px;font-weight:700;display:flex;position:absolute;inset:0}.topic-list{flex-direction:column;gap:8px;margin:0;padding:0;list-style:none;display:flex}.topic-list li{animation:.4s ease-out both topicIn}@keyframes topicIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.topic-item{background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius-md);color:inherit;box-shadow:var(--shadow-card);align-items:center;gap:14px;padding:14px 16px;text-decoration:none;transition:transform .12s,background .2s,box-shadow .2s;display:flex}.topic-item:active{background:var(--color-card-active);transform:scale(.98)}.topic-number-wrap{background:var(--color-primary-dim);border-radius:var(--radius-sm);flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px;display:flex}.topic-number{color:var(--color-primary);letter-spacing:-.02em;font-size:14px;font-weight:800}.topic-info{flex:1;min-width:0}.topic-name{letter-spacing:-.01em;font-size:14px;font-weight:600;line-height:1.35}.topic-meta{color:var(--color-text-tertiary);align-items:center;gap:8px;margin-top:3px;font-size:12px;font-weight:500;display:flex}.topic-meta-progress{color:var(--color-primary);font-weight:600}.topic-detail-hero{justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:32px;display:flex}.topic-detail-hero-text{flex:1;min-width:0}.topic-detail-label{color:var(--color-primary);text-transform:uppercase;letter-spacing:.08em;font-size:12px;font-weight:700}.topic-detail-title{letter-spacing:-.03em;color:var(--color-text-primary);-webkit-text-fill-color:unset;background:0 0;margin:6px 0 0;font-size:22px;font-weight:800;line-height:1.25}.topic-detail-meta{color:var(--color-text-tertiary);align-items:center;gap:10px;margin-top:8px;font-size:13px;font-weight:500;display:flex}.topic-detail-accuracy{color:var(--color-success);font-weight:600}.mode-list{flex-direction:column;gap:10px;display:flex}.mode-card{background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius-md);color:inherit;box-shadow:var(--shadow-card);align-items:center;gap:14px;padding:16px;text-decoration:none;transition:transform .12s,background .2s;animation:.4s ease-out both modeIn;display:flex}@keyframes modeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.mode-card:active{background:var(--color-card-active);transform:scale(.97)}.mode-icon{border-radius:12px;flex-shrink:0;justify-content:center;align-items:center;width:42px;height:42px;display:flex}.mode-icon svg{width:22px;height:22px}.mode-info{flex:1;min-width:0}.mode-title{letter-spacing:-.01em;font-size:15px;font-weight:700}.mode-desc{color:var(--color-text-tertiary);margin-top:2px;font-size:13px;font-weight:500}.mode-chevron{width:18px;height:18px;color:var(--color-text-tertiary);flex-shrink:0}.answer-option{background:var(--color-card);border:1.5px solid var(--color-border);border-radius:var(--radius-md);text-align:left;width:100%;color:var(--color-text-primary);cursor:pointer;box-shadow:var(--shadow-card);align-items:flex-start;gap:12px;padding:14px 16px;font-size:15px;line-height:1.45;transition:transform .12s,border-color .3s,background .3s,box-shadow .3s;display:flex;position:relative;overflow:hidden}.answer-option:before{content:"";pointer-events:none;background:linear-gradient(135deg,#0000 0%,#ffffff05 100%);position:absolute;inset:0}.answer-option:not(:disabled):active{transform:scale(.97)}.answer-option:disabled{cursor:default}.answer-letter{color:var(--color-primary);background:var(--color-primary-dim);letter-spacing:0;border-radius:7px;flex-shrink:0;justify-content:center;align-items:center;min-width:24px;height:24px;font-size:14px;font-weight:800;transition:background .3s,color .3s;display:flex}.answer-text{flex:1;padding-top:1px}.answer-selected-correct{border-color:var(--color-success);background:var(--color-success-bg);box-shadow:0 0 0 1px var(--color-success-dim), 0 4px 16px #2ecc7126}.answer-selected-correct .answer-letter{color:#fff;background:var(--color-success)}.answer-selected-incorrect{border-color:var(--color-error);background:var(--color-error-bg);box-shadow:0 0 0 1px var(--color-error-dim), 0 4px 16px #e74c3c26}.answer-selected-incorrect .answer-letter{color:#fff;background:var(--color-error)}.answer-revealed-correct{border-color:var(--color-success);background:0 0}.answer-revealed-correct .answer-letter{color:var(--color-success);background:var(--color-success-bg)}.expert-comment{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);margin-top:20px;padding:18px;animation:.4s cubic-bezier(.16,1,.3,1) commentIn;position:relative;overflow:hidden}.expert-comment:before{content:"";background:linear-gradient(90deg, var(--color-primary), transparent);opacity:.5;height:2px;position:absolute;top:0;left:0;right:0}@keyframes commentIn{0%{opacity:0;transform:translateY(12px)scale(.98)}to{opacity:1;transform:translateY(0)scale(1)}}.pdr-points{flex-wrap:wrap;gap:6px;margin-bottom:14px;display:flex}.pdr-badge{background:var(--color-primary-dim);color:var(--color-primary);letter-spacing:.01em;border-radius:8px;padding:5px 10px;font-size:11px;font-weight:700;display:inline-block}.expert-text{color:var(--color-text-secondary);font-size:14px;line-height:1.65}.expert-text p{margin:0 0 10px}.expert-text p:last-child{margin-bottom:0}.expert-text a{color:var(--color-primary);text-decoration:underline;-webkit-text-decoration-color:var(--color-primary-dim);text-decoration-color:var(--color-primary-dim);text-underline-offset:2px}.question-card{padding:16px 20px calc(32px + env(safe-area-inset-bottom,0px));animation:.4s ease-out questionIn}@keyframes questionIn{0%{opacity:0;transform:translate(20px)}to{opacity:1;transform:translate(0)}}.question-progress{justify-content:center;align-items:center;gap:8px;margin-bottom:20px;display:flex}.question-progress-bar{background:var(--color-border);border-radius:2px;flex:1;height:3px;overflow:hidden}.question-progress-fill{background:var(--color-primary);border-radius:2px;height:100%;transition:width .4s cubic-bezier(.4,0,.2,1)}.question-progress-text{color:var(--color-text-tertiary);letter-spacing:.04em;font-variant-numeric:tabular-nums;flex-shrink:0;font-size:12px;font-weight:700}.question-image{border-radius:var(--radius-lg);background:var(--color-surface);border:1px solid var(--color-border);width:100%;margin-bottom:20px}.question-text{letter-spacing:-.02em;margin:0 0 24px;font-size:18px;font-weight:600;line-height:1.5}.answers-list{flex-direction:column;gap:10px;display:flex}.quiz-page{min-height:100%;animation:.35s ease-out pageIn}.quiz-header{z-index:10;background:linear-gradient(to bottom, var(--color-bg) 60%, transparent);justify-content:space-between;align-items:center;padding:8px 20px;display:flex;position:sticky;top:0}.quiz-mode-badge{background:var(--color-primary-dim);color:var(--color-primary);letter-spacing:.02em;text-transform:uppercase;border-radius:20px;padding:5px 12px;font-size:11px;font-weight:700}.quiz-result{text-align:center;flex-direction:column;justify-content:center;align-items:center;min-height:70vh;padding:40px 20px;animation:.5s ease-out resultIn;display:flex}@keyframes resultIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}.quiz-result h1{letter-spacing:-.04em;margin:0 0 8px;font-size:28px;font-weight:800}.result-score{color:var(--color-primary);letter-spacing:-.04em;text-shadow:0 0 40px #f5a6234d;margin:8px 0;font-size:56px;font-weight:800;line-height:1}.result-detail{color:var(--color-text-tertiary);margin:8px 0 32px;font-size:15px;font-weight:500}.exam-start{flex-direction:column;display:flex}.exam-info-card{background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);margin-bottom:16px;padding:20px}.exam-info-title{color:var(--color-text-tertiary);text-transform:uppercase;letter-spacing:.06em;margin-bottom:14px;font-size:12px;font-weight:700}.exam-info-rows{border-bottom:1px solid var(--color-border);flex-direction:column;gap:10px;margin-bottom:18px;padding-bottom:18px;display:flex}.exam-info-row{color:var(--color-text-primary);align-items:center;gap:10px;font-size:14px;font-weight:500;display:flex}.exam-info-dot{border-radius:50%;flex-shrink:0;width:8px;height:8px}.exam-info-row span:nth-child(2){flex:1}.exam-info-count{color:var(--color-text-secondary);text-align:right;min-width:20px;font-size:13px;font-weight:800}.exam-info-rules{flex-direction:column;gap:10px;display:flex}.exam-rule{color:var(--color-text-secondary);align-items:center;gap:10px;font-size:14px;font-weight:600;display:flex}.exam-rule svg{width:18px;height:18px;color:var(--color-primary);flex-shrink:0}.exam-history{background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);margin-bottom:16px;padding:20px}.exam-history-title{color:var(--color-text-tertiary);text-transform:uppercase;letter-spacing:.06em;margin-bottom:14px;font-size:12px;font-weight:700}.exam-history-stats{justify-content:space-around;display:flex}.exam-history-stat{flex-direction:column;align-items:center;gap:4px;display:flex}.exam-history-value{color:var(--color-primary);font-size:22px;font-weight:800}.exam-history-label{color:var(--color-text-tertiary);text-transform:uppercase;letter-spacing:.04em;font-size:11px;font-weight:600}.exam-start-btn{min-height:54px;margin-top:auto}.exam-page{-webkit-overflow-scrolling:touch;height:100dvh;min-height:100%;animation:.35s ease-out pageIn;overflow-y:auto}.exam-header{padding:calc(env(safe-area-inset-top,12px) + 8px) 20px 0;z-index:10;background:linear-gradient(to bottom, var(--color-bg) 60%, transparent);justify-content:space-between;align-items:center;padding-bottom:8px;display:flex;position:sticky;top:0}.exam-title{letter-spacing:-.02em;font-size:17px;font-weight:800}.exam-header-right{align-items:center;gap:8px;display:flex}.exam-errors{color:var(--color-error);background:var(--color-error-bg);font-variant-numeric:tabular-nums;border-radius:20px;padding:4px 10px;font-size:13px;font-weight:700}.exam-errors-critical{animation:.8s infinite timerPulse}.exam-timer{font-variant-numeric:tabular-nums;color:var(--color-primary);background:var(--color-primary-dim);letter-spacing:.02em;border-radius:20px;padding:6px 14px;font-size:16px;font-weight:700}.timer-warning{color:var(--color-error);background:var(--color-error-bg);animation:.8s infinite timerPulse}@keyframes timerPulse{0%,to{opacity:1;transform:scale(1)}50%{opacity:.7;transform:scale(1.03)}}.exam-result{text-align:center;flex-direction:column;justify-content:center;align-items:center;min-height:70vh;padding:40px 20px;animation:.5s ease-out resultIn;display:flex}.exam-result-icon{margin-bottom:20px;font-size:72px;animation:.6s cubic-bezier(.34,1.56,.64,1) .2s both iconBounce}@keyframes iconBounce{0%{transform:scale(0)}to{transform:scale(1)}}.exam-result h1{letter-spacing:-.03em;margin:0 0 8px;font-size:26px;font-weight:800}.result-time{color:var(--color-text-tertiary);font-variant-numeric:tabular-nums;margin:4px 0 20px;font-size:14px;font-weight:500}.exam-structure{background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius-md);width:100%;max-width:280px;margin-bottom:24px;padding:16px}.exam-structure-title{color:var(--color-text-tertiary);text-transform:uppercase;letter-spacing:.06em;margin-bottom:10px;font-size:12px;font-weight:700}.exam-structure-row{color:var(--color-text-secondary);border-bottom:1px solid var(--color-border-subtle);justify-content:space-between;padding:6px 0;font-size:13px;font-weight:500;display:flex}.exam-structure-row:last-child{border-bottom:none}.exam-structure-row span:last-child{color:var(--color-primary);font-weight:700}.stats-grid{grid-template-columns:1fr 1fr;gap:10px;margin-bottom:28px;display:grid}.stat-card{background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius-md);text-align:center;box-shadow:var(--shadow-card);padding:18px 16px;position:relative;overflow:hidden}.stat-card:before{content:"";background:linear-gradient(90deg, var(--color-primary), transparent);opacity:.3;height:2px;position:absolute;top:0;left:0;right:0}.stat-value{color:var(--color-primary);letter-spacing:-.03em;font-size:26px;font-weight:800}.stat-label{color:var(--color-text-tertiary);text-transform:uppercase;letter-spacing:.04em;margin-top:4px;font-size:11px;font-weight:600}.stats-section-title{letter-spacing:-.02em;color:var(--color-text-primary);margin:0 0 14px;font-size:16px;font-weight:800}.section-stats-list{flex-direction:column;gap:10px;display:flex}.section-stat-row{background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--radius-sm);align-items:center;gap:10px;padding:12px 14px;font-size:13px;display:flex}.section-stat-info{flex:1;align-items:baseline;gap:8px;min-width:0;display:flex}.section-stat-number{color:var(--color-primary);min-width:24px;font-size:12px;font-weight:800}.section-stat-name{white-space:nowrap;text-overflow:ellipsis;font-weight:500;overflow:hidden}.section-stat-bar-wrap{background:var(--color-border);border-radius:2px;flex-shrink:0;width:52px;height:4px;overflow:hidden}.section-stat-bar{background:var(--color-primary);border-radius:2px;height:100%;transition:width .4s cubic-bezier(.4,0,.2,1)}.section-stat-pct{text-align:right;min-width:32px;color:var(--color-text-secondary);font-variant-numeric:tabular-nums;font-size:12px;font-weight:700}.stats-empty{text-align:center;color:var(--color-text-tertiary);margin-top:60px;font-size:15px;font-weight:500;line-height:1.5}