:root{font-family:Inter,Segoe UI,Arial,sans-serif;color:#263b35;background:#f6f7f9;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;--bg: #f6f7f9;--surface: #fff;--surface-soft: #f9fafb;--text: #263b35;--muted: #7a8581;--border: #e6eae7;--green: #306c57;--green-soft: #edf4ef;--green-dark: #214d3e;--red: #a23e3e;--red-soft: #fbefec;--shadow: 0 4px 15px #1b342703}*{box-sizing:border-box}body{margin:0}button,a,input{font:inherit}button{cursor:pointer}button,a{-webkit-tap-highlight-color:transparent}button{color:inherit}button:disabled{cursor:not-allowed}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #83ad96;outline-offset:4px}a{color:var(--green);text-decoration:none}button{border:0;background:none}button,a{touch-action:manipulation}h1,h2,h3,p{margin:0}h1,h2,h3{letter-spacing:-.035em}button svg,a svg{flex-shrink:0}button{transition:background .15s,border-color .15s,transform .15s}::selection{background:#cce0d1}svg{vertical-align:middle}.app-shell{min-height:100vh}.sidebar{width:246px;position:fixed;inset:0 auto 0 0;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:37px 22px 22px;z-index:30}.brand{display:flex;align-items:center;gap:12px;text-align:left;padding:0 10px;margin-bottom:58px}.brand-logo{height:43px;width:43px;background:var(--green);color:#fff;border-radius:12px;position:relative;font-size:27px;font-weight:600;line-height:43px;text-align:center;letter-spacing:-2px}.brand-logo span{font-size:12px;position:absolute;right:6px;top:-7px;letter-spacing:0}.brand-text{font-size:21px;letter-spacing:-.6px;font-weight:650}.brand-text>span{display:block;font-size:11px;letter-spacing:.7px;font-weight:400;color:var(--muted);margin-top:2px}.sidebar-section-label{font-size:9px;letter-spacing:1.7px;color:var(--muted);margin:0 12px 15px;font-weight:650}.sidebar nav{display:grid;gap:7px}.nav-link{display:flex;align-items:center;gap:12px;padding:13px 14px;border-radius:8px;text-align:left;font-size:12px;font-weight:500;min-height:46px;color:#77837d}.nav-link>svg:last-child:not(:first-child){margin-left:auto}.nav-link:hover{background:var(--surface-soft)}.nav-link.active{background:var(--green-soft);color:var(--green);font-weight:650}.sidebar-course{margin:34px 10px 20px;padding-top:25px;border-top:1px solid var(--border)}.course-icon{color:var(--green);display:inline-flex;background:var(--surface-soft);padding:9px;border-radius:8px;margin-bottom:13px}.sidebar-course p{font-size:12px;font-weight:650;margin-bottom:18px}.sidebar-course p>span{display:block;color:var(--muted);font-size:10px;font-weight:400;margin-top:6px}.course-topic{display:flex;align-items:center;gap:9px;color:var(--muted);font-size:10px;margin-top:13px}.course-topic>span{font-size:9px;color:var(--green);background:var(--green-soft);padding:4px 5px;border-radius:4px;font-weight:650}.sidebar-bottom{margin-top:auto}.local-status{padding:16px 10px;display:flex;align-items:flex-start;gap:9px;font-size:10px}.status-dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:#689276;flex-shrink:0;margin-top:3px}.local-status small{display:block;color:var(--muted);font-size:9px;margin-top:6px}.theme-toggle{display:flex;align-items:center;gap:9px;border:1px solid var(--border);padding:12px;border-radius:8px;width:100%;font-size:11px;color:var(--muted);margin-top:9px}.toggle-track{margin-left:auto;display:inline-flex;background:#e8ede9;width:28px;padding:3px;border-radius:20px}.toggle-track>span{width:10px;height:10px;border-radius:50%;background:#fff;box-shadow:0 1px 3px #0002}.sidebar-foot{margin-top:21px;display:flex;justify-content:space-between;font-size:8px;color:var(--muted);padding:0 5px}.main-content{margin-left:246px;max-width:1600px;padding:0 48px 24px}.page-top{height:79px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:16px;font-size:11px;color:var(--muted)}.course-label{display:flex;align-items:center;gap:9px;font-size:10px}.course-label>span{width:3px;height:3px;border-radius:50%;background:#a3aaa7}.home-heading{display:flex;justify-content:space-between;align-items:center;padding:39px 0 29px}.eyebrow{font-size:9px;letter-spacing:1.7px;font-weight:650;color:var(--green);margin-bottom:12px}.home-heading h1,.standard-heading h1{font-size:39px;font-weight:560;line-height:1.17;letter-spacing:-1.55px}.home-heading h1>span,.standard-heading h1>span{color:var(--green)}.home-heading p:not(.eyebrow),.standard-heading p:not(.eyebrow){font-size:12px;color:var(--muted);margin-top:14px;line-height:1.7}.heading-mark{display:flex;flex-direction:column;align-items:center;gap:11px;color:#668c79;margin-right:29px;transform:rotate(-6deg)}.heading-mark svg{height:79px;width:79px;stroke-width:.8}.heading-mark span{font-size:8px;letter-spacing:3px}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:38px}.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:11px;padding:19px 21px;box-shadow:var(--shadow)}.stat-label{display:flex;align-items:center;justify-content:space-between;font-size:11px;color:var(--muted);font-weight:500}.mini-icon{background:var(--green-soft);padding:7px;border-radius:8px;color:var(--green)}.tone-1{background:#eff1f9;color:#6d7fac}.tone-2{background:#fbf3e8;color:#b09563}.stat-number{font-size:33px;font-weight:550;letter-spacing:-1.2px;margin:7px 0 12px;line-height:1.3;font-variant-numeric:tabular-nums}.stat-number>span{font-size:18px;color:var(--muted);margin-left:2px}.stat-bottom>span{font-size:9px;color:var(--muted);display:block;margin-bottom:13px}.progress-track{height:4px;background:var(--border);border-radius:10px;overflow:hidden}.progress-track>div{height:100%;background:#5d8d73;border-radius:10px;transition:width .35s}.home-columns{display:grid;grid-template-columns:minmax(0,1fr) 296px;gap:26px;align-items:start}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:20px}.section-heading h2{font-size:19px;font-weight:600}.section-heading .eyebrow{font-size:8px;letter-spacing:1.4px;margin-bottom:8px;color:var(--muted)}.practice-panel{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:25px;box-shadow:var(--shadow)}.step-label{display:flex;align-items:center;gap:9px;font-size:12px;font-weight:600;margin-bottom:18px}.step-label>span{display:inline-grid;place-items:center;width:21px;height:21px;background:var(--surface-soft);border:1px solid var(--border);border-radius:50%;font-size:9px;color:var(--muted)}.topic-tabs{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:8px}.topic-tabs>button{display:flex;align-items:center;justify-content:center;gap:7px;border:1px solid var(--border);border-radius:7px;padding:13px 6px;font-size:10px;font-weight:550;white-space:nowrap}.topic-tabs>button.active{border-color:#719780;background:var(--green-soft);color:var(--green)}.topic-tabs>button:hover{border-color:#719780}.topic-description{font-size:10px;line-height:1.8;color:var(--muted);margin-top:13px}.topic-description>span{display:block;font-size:9px}.subtopic-picker{margin-top:12px;border:1px solid var(--border);border-radius:7px;padding:0 12px}.subtopic-picker summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:10px;padding:12px 0}.subtopic-picker summary::-webkit-details-marker{display:none}.subtopic-picker summary>span{display:flex;gap:6px;align-items:center;color:var(--muted);font-size:9px}.subtopic-picker[open] summary>span>svg{transform:rotate(90deg)}.chip-list{display:flex;flex-wrap:wrap;gap:6px;padding:2px 0 15px}.chip{font-size:10px;line-height:1.5;border:1px solid var(--border);border-radius:5px;padding:7px 8px;text-align:left;color:var(--muted)}.chip.selected{background:var(--green-soft);border-color:#8ba993;color:var(--green)}.panel-divider{height:1px;background:var(--border);margin:23px 0}.mode-list{display:grid;gap:9px}.mode-option{display:flex;align-items:center;gap:12px;border:1px solid var(--border);border-radius:8px;padding:14px 13px;text-align:left}.mode-option:hover{border-color:#8ca496}.mode-option.selected{border-color:#6f967c;background:#f4f8f4}.mode-icon{width:35px;height:35px;display:grid;place-items:center;border-radius:8px;background:var(--surface-soft);color:#7a8780;flex-shrink:0}.mode-option.selected .mode-icon{color:var(--green);background:#e6efe7}.mode-copy{display:flex;flex-direction:column;gap:5px}.mode-copy>strong{font-size:11px;font-weight:600}.mode-copy>span{font-size:9px;line-height:1.4;color:var(--muted)}.mode-meta{font-size:8px;color:var(--muted);margin-left:auto;white-space:nowrap}.radio-dot{width:15px;height:15px;border-radius:50%;border:1px solid #cfd7d1;display:grid;place-items:center;flex-shrink:0}.mode-option.selected .radio-dot{border-color:var(--green)}.radio-dot>span{width:7px;height:7px;background:var(--green);border-radius:50%}.start-row{margin-top:22px;display:flex;gap:12px;align-items:center;justify-content:space-between}.start-row>span{font-size:9px;color:var(--muted);line-height:1.6;max-width:140px}.button{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:13px 18px;border-radius:7px;font-size:11px;line-height:1.5;font-weight:600;min-height:43px;text-align:center}.button.primary{background:var(--green);color:#fff;border:1px solid var(--green)}.button.primary:hover{background:var(--green-dark)}.button.secondary{background:var(--surface);border:1px solid var(--border);color:var(--text)}.button.secondary:hover{background:var(--surface-soft)}.button:disabled{opacity:.45}.button.danger{border:1px solid #d7a9a1;color:var(--red);background:var(--surface)}.button.danger-solid{background:var(--red);color:#fff}.home-aside{padding-top:0}.exam-card{border-radius:12px;padding:25px 24px 20px;background:#294f40;color:#f7faf5;position:relative;overflow:hidden}.exam-card:after{content:"";height:200px;width:200px;border:1px solid #ffffff0a;border-radius:50%;position:absolute;right:-100px;top:55px;pointer-events:none}.exam-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:21px}.exam-icon{display:grid;place-items:center;width:40px;height:40px;border:1px solid #ffffff2a;border-radius:10px;color:#d6e1c1}.pill{font-size:7px;font-weight:550;letter-spacing:1.4px;border:1px solid #ffffff25;border-radius:4px;padding:5px 7px;color:#d0dfcf}.exam-card h2{font-size:23px;line-height:1.24;font-weight:500;letter-spacing:-.65px}.exam-card>p{font-size:10px;line-height:1.8;color:#c0d1c4;margin-top:14px;max-width:220px}.exam-card ul{list-style:none;padding:0;display:grid;gap:12px;margin:23px 0}.exam-card li{display:flex;align-items:center;gap:8px;font-size:10px;color:#d9e6da}.exam-card li svg{color:#b5cba5}.exam-button{width:100%;background:#e3eccc;color:#294e3c;position:relative;justify-content:space-between;padding:12px 14px}.exam-button:hover{background:#d4e2b6}.exam-best{font-size:8px;color:#abc4b0;text-align:center;margin-top:13px}.weak-card{border:1px solid var(--border);border-radius:11px;background:var(--surface);margin-top:19px;padding:18px 20px}.aside-heading{display:flex;justify-content:space-between;align-items:center;font-size:11px;font-weight:600}.aside-heading>span{display:flex;align-items:center;gap:9px}.aside-heading svg{color:var(--green)}.icon-button{display:inline-grid;place-items:center;min-width:30px;min-height:30px;border-radius:6px;color:var(--muted)}.icon-button:hover{background:var(--green-soft);color:var(--green)}.weak-empty{text-align:center;padding:22px 0 9px}.seed-icon{display:inline-grid;place-items:center;border:1px dashed #cfdad0;width:53px;height:53px;border-radius:50%;color:#7e9a83;margin-bottom:13px}.weak-empty p{font-size:11px;line-height:1.8;color:var(--muted)}.weak-empty p strong{font-weight:500;color:var(--text)}.weak-empty>span:last-child{font-size:9px;line-height:1.6;max-width:190px;display:block;margin:11px auto 0;color:var(--muted)}.weak-card>.muted{font-size:10px;margin-top:9px}.weak-list{display:grid;margin-top:16px}.weak-list>button{display:flex;align-items:center;gap:10px;padding:12px 0;text-align:left;border-top:1px solid var(--border)}.weak-index{font-size:10px;color:var(--muted)}.weak-list strong{font-size:10px;display:block;line-height:1.4;font-weight:550}.weak-list small{font-size:9px;display:block;color:var(--muted);margin-top:5px}.weak-list svg{margin-left:auto;color:var(--muted)}.source-note{display:flex;align-items:flex-start;gap:10px;padding:21px 5px}.source-note>svg{color:#8b9b8e;flex-shrink:0;margin-top:3px}.source-note p{font-size:9px;color:var(--muted);line-height:1.9}.source-note strong{color:var(--text);font-weight:500}.page-footer{border-top:1px solid var(--border);margin-top:34px;padding-top:20px;font-size:9px;color:var(--muted);display:flex;justify-content:space-between;gap:20px}.page-footer .status-dot{margin-right:6px;width:5px;height:5px}.resume-banner{display:flex;justify-content:space-between;align-items:center;border:1px solid #cbdccf;background:var(--green-soft);padding:14px 18px;border-radius:8px;margin-bottom:20px;gap:15px;font-size:11px}.resume-banner>div{display:flex;align-items:center;gap:10px}.text-button{display:inline-flex;align-items:center;gap:7px;font-size:11px;font-weight:550;color:var(--green);padding:5px 0}.text-button.small{font-size:10px;margin-bottom:12px}.muted{color:var(--muted);font-size:12px;line-height:1.7}.empty{text-align:center;padding:40px 16px}.empty-icon{display:inline-grid;place-items:center;width:55px;height:55px;border-radius:16px;background:var(--green-soft);color:var(--green);margin-bottom:16px}.empty h3{font-size:16px;font-weight:550;margin-bottom:10px}.empty p{color:var(--muted);font-size:12px;line-height:1.8;max-width:300px;margin:auto}.standard-heading{margin:39px 0 30px}.standard-heading h1{font-size:35px}.surface{background:var(--surface);border:1px solid var(--border);border-radius:11px;padding:25px;margin-bottom:22px;box-shadow:var(--shadow)}.surface>.section-heading h2{font-size:17px}.surface>.section-heading strong{font-size:16px;font-weight:550}.statistics-totals{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:22px}.statistics-totals .stat-number{margin-bottom:0}.topic-performance{display:grid;grid-template-columns:1fr 1fr;gap:22px}.topic-performance .muted{font-size:10px;margin-top:12px}.results-columns{display:grid;grid-template-columns:1.1fr 1fr;gap:22px;align-items:start}.performance-list{display:grid;gap:23px}.performance-row>div:first-child{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:9px;font-size:11px}.performance-row strong{font-size:12px;font-weight:550}.performance-row small{display:block;color:var(--muted);font-size:9px;margin-top:8px}.performance-row>div>span>small{font-size:8px;letter-spacing:1px;margin:0 0 6px}.performance-row .progress-track{height:5px}.mistake-ranking article{border-bottom:1px solid var(--border);padding:15px 0}.mistake-ranking article:first-child{padding-top:0}.mistake-ranking article:last-child{border:0;padding-bottom:0}.mistake-ranking article>div{display:flex;justify-content:space-between;align-items:center}.error-count{font-size:9px;color:var(--red)}.mistake-ranking h3{font-size:12px;font-weight:500;line-height:1.7;letter-spacing:0;margin:10px 0 7px}.mistake-ranking p{font-size:10px;color:var(--muted);line-height:1.7}.exam-history .muted{margin-bottom:14px}.table-scroll{overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:11px;text-align:left}th{font-size:9px;color:var(--muted);font-weight:500;padding:14px 12px;background:var(--surface-soft);white-space:nowrap}td{padding:14px 12px;border-bottom:1px solid var(--border);white-space:nowrap}.reset-panel{display:flex;align-items:center;justify-content:space-between;gap:20px;border:1px solid var(--border);border-radius:10px;padding:22px}.reset-panel h3{font-size:13px;font-weight:550}.reset-panel p{font-size:10px;color:var(--muted);margin-top:7px;line-height:1.7}.sources-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}.source-book{display:inline-grid;place-items:center;width:60px;height:60px;background:var(--green-soft);border-radius:14px;color:var(--green);margin-bottom:25px}.sources-grid h2{font-size:23px;font-weight:550;margin-bottom:10px}.source-subtopics{padding-left:18px;color:var(--muted);font-size:11px;line-height:2.1;margin:20px 0 25px}.source-method p{font-size:12px;color:var(--muted);line-height:1.9;margin-top:13px}.reference-links{display:grid;gap:12px}.reference-links>a{display:flex;align-items:center;gap:12px;padding:13px;background:var(--surface-soft);border-radius:7px;font-size:11px}.reference-links>a>span{overflow-wrap:anywhere}.reference-links>a>svg:last-child{margin-left:auto}.quiz-main{max-width:1400px}.quiz-page{max-width:860px;margin:0 auto}.quiz-top{display:flex;align-items:center;gap:12px;font-size:11px;color:var(--muted);margin:35px 0 21px;flex-wrap:wrap}.tag{display:inline-block;background:var(--green-soft);color:var(--green);font-size:8px;letter-spacing:1px;font-weight:650;padding:6px 8px;border-radius:4px}.difficulty{margin-left:auto;border-radius:4px;padding:5px 9px;font-size:9px;background:var(--surface);border:1px solid var(--border)}.difficulty.hard{color:#a27d41;background:#faf4e9;border-color:#ece0ca}.difficulty.easy{color:var(--green)}.quiz-progress-label{display:flex;justify-content:space-between;color:var(--muted);font-size:10px;margin-bottom:10px}.quiz-progress-label strong{color:var(--text)}.quiz-page>.progress-track{height:5px}.question-card{background:var(--surface);border:1px solid var(--border);border-radius:13px;padding:37px 36px 24px;margin-top:26px;box-shadow:var(--shadow)}.question-card h1{font-size:26px;line-height:1.47;letter-spacing:-.5px;font-weight:550;margin-bottom:30px}.question-card h1:focus{outline:none}.question-card>.eyebrow{display:block;margin-bottom:12px;font-size:9px;color:var(--muted)}.answer-options{display:grid;gap:11px}.answer-option{display:flex;align-items:center;gap:15px;width:100%;border:1px solid var(--border);padding:16px;border-radius:8px;text-align:left;font-size:12px;line-height:1.65;font-weight:450;background:var(--surface)}.answer-option:not(:disabled):hover{border-color:#719780;background:var(--green-soft)}.option-key{display:inline-grid;place-items:center;flex-shrink:0;width:27px;height:27px;border:1px solid var(--border);border-radius:5px;font-size:11px;color:var(--muted);background:var(--surface-soft)}.option-state{margin-left:auto;flex-shrink:0;width:20px}.answer-option.correct{background:var(--green-soft);border-color:#77a185;color:var(--green)}.answer-option.wrong{background:var(--red-soft);border-color:#d6a096;color:var(--red)}.answer-option.picked{background:var(--green-soft);border-color:#77a185;color:var(--green)}.answer-option:disabled{cursor:default}.feedback{padding:22px;background:var(--green-soft);border:1px solid #d1e0d5;border-radius:9px;margin-top:24px}.feedback.is-wrong{background:#faf6f0;border-color:#e8dbc7}.feedback-title{display:flex;gap:10px;align-items:center;color:var(--green);font-size:13px;line-height:1.7}.feedback.is-wrong .feedback-title{color:#976b38}.feedback>p{font-size:12px;line-height:1.9;margin-top:10px}.feedback .correct-answer{font-size:11px}.remember{border-top:1px solid #cfdbd1;margin-top:17px;padding-top:16px}.is-wrong .remember{border-color:#e5d9c6}.remember>span{font-size:8px;letter-spacing:1px;color:var(--muted);font-weight:600}.remember>p{font-size:11px;line-height:1.9;margin-top:7px}.source-link{display:inline-flex;align-items:center;flex-wrap:wrap;gap:6px;font-size:9px;margin-top:17px;color:var(--green);line-height:1.8}.quiz-actions{display:flex;justify-content:space-between;align-items:center;gap:16px;border-top:1px solid var(--border);padding-top:22px;margin-top:27px}.keyboard-hint{color:var(--muted);font-size:9px;line-height:2;display:flex;align-items:center;gap:4px;flex-wrap:wrap}.keyboard-hint>span{margin:0 5px}kbd{font-family:inherit;font-size:9px;display:inline-grid;place-items:center;min-width:17px;height:18px;border:1px solid var(--border);border-radius:3px;padding:0 4px;background:var(--surface-soft);box-shadow:0 1px 1px #0001}.quiz-save{display:flex;align-items:center;justify-content:center;gap:7px;font-size:10px;line-height:1.7;color:var(--muted);margin-top:20px}.exam-notice{display:flex;align-items:center;gap:9px;font-size:10px;color:var(--muted);padding:15px 0 0;line-height:1.7}.results-header{text-align:center;margin:35px auto 26px;max-width:600px}.result-symbol{display:inline-grid;place-items:center;width:66px;height:66px;border-radius:18px;background:var(--green-soft);color:var(--green);margin-bottom:20px}.results-header h1{font-size:32px;font-weight:550;line-height:1.3}.results-header>p:last-child{color:var(--muted);font-size:12px;line-height:1.9;margin-top:13px}.result-score-panel{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:27px;align-items:center;text-align:center;max-width:800px;margin:auto}.result-score-panel>div:not(:first-child){border-left:1px solid var(--border);display:grid;gap:8px}.result-score-panel>div>strong{font-size:27px;font-weight:550;letter-spacing:-1px}.result-score-panel>div>span{font-size:10px;color:var(--muted)}.big-grade{font-size:43px;font-weight:500;letter-spacing:-1.7px;color:var(--green)}.big-grade>span{margin-left:8px}.big-grade>small{display:block;font-size:10px;color:var(--muted);font-weight:400;letter-spacing:0;margin-top:8px}.grading-note{text-align:center;font-size:9px;line-height:1.8;color:var(--muted);margin:14px auto;max-width:650px}.result-actions{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin:22px 0 35px}.review-concepts{display:grid;gap:22px}.review-concepts h3{font-size:13px;font-weight:550;margin:9px 0}.review-concepts p{font-size:11px;color:var(--muted);line-height:1.9}.success-empty{padding:25px 10px;text-align:center;color:var(--green)}.success-empty h3{font-size:15px;font-weight:550;margin:15px 0 9px}.success-empty p{font-size:11px;color:var(--muted);line-height:1.8}.error-review{margin-top:15px}.error-card{padding:25px;background:var(--surface);border:1px solid var(--border);border-radius:10px;margin-bottom:20px}.error-card .quiz-top{margin:0 0 18px}.error-card>h3{font-size:17px;line-height:1.7;font-weight:550;letter-spacing:-.2px}.your-answer{border-left:3px solid #d5a69b;padding:10px 14px;margin-top:18px;background:var(--red-soft);border-radius:0 5px 5px 0}.your-answer>span{font-size:9px;color:var(--red)}.your-answer>p{font-size:12px;margin-top:6px;line-height:1.7}.error-review>.muted{display:flex;align-items:center;gap:8px}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#11271e80;z-index:100;display:grid;place-items:center;padding:20px;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px)}.modal-card{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:30px;max-width:490px;box-shadow:0 20px 80px #0003}.modal-card h2{font-size:22px;font-weight:550;line-height:1.5}.modal-card p{font-size:12px;line-height:1.9;color:var(--muted);margin:12px 0 25px}.modal-card>div{display:flex;gap:10px;justify-content:flex-end;flex-wrap:wrap}.toast{position:fixed;bottom:25px;left:50%;transform:translate(-50%);padding:15px 23px;background:var(--green-dark);color:#fff;border-radius:10px;font-size:12px;z-index:120;box-shadow:0 8px 25px #0002;display:flex;gap:10px;align-items:center;max-width:90vw}.storage-warning{padding:14px 20px;background:#fff4da;color:#745d2c;border-radius:7px;font-size:12px;line-height:1.7;margin-top:18px}.skip-link{position:fixed;top:-100px;left:260px;z-index:150;padding:15px;background:var(--green);color:#fff;border-radius:6px}.skip-link:focus{top:10px}.mobile-bar,.mobile-overlay{display:none}[data-theme=dark]{color-scheme:dark;--bg: #141d19;--surface: #1c2821;--surface-soft: #202d25;--text: #e2e9e2;--muted: #a0ada3;--border: #314035;--green: #8fbda0;--green-soft: #283d2e;--green-dark: #396d4b;--red: #e1a397;--red-soft: #3c2925;--shadow: none;background:var(--bg);color:var(--text)}[data-theme=dark] .button.primary{color:#16261c;background:#a1c6a3;border-color:#a1c6a3}[data-theme=dark] .button.primary:hover{background:#b6d7b8}[data-theme=dark] .brand-logo{color:#1b3020}[data-theme=dark] .mode-option.selected{background:#24382a;border-color:#799a7e}[data-theme=dark] .mode-option.selected .mode-icon{background:#304936}[data-theme=dark] .feedback{border-color:#435948}[data-theme=dark] .feedback.is-wrong{background:#352f23;border-color:#544732}[data-theme=dark] .feedback.is-wrong .feedback-title{color:#d9b985}[data-theme=dark] .remember{border-color:#435948}[data-theme=dark] .is-wrong .remember{border-color:#544732}[data-theme=dark] .difficulty.hard{color:#d7b47b;background:#352f23;border-color:#544732}[data-theme=dark] .tone-1{background:#293446;color:#a5b5d9}[data-theme=dark] .tone-2{background:#393324;color:#c9b07e}[data-theme=dark] .toggle-track{background:#557c5e;justify-content:flex-end}[data-theme=dark] .answer-option.correct,[data-theme=dark] .answer-option.picked{border-color:#799c7e}[data-theme=dark] .nav-link{color:var(--muted)}[data-theme=dark] .nav-link.active{color:var(--green)}[data-theme=dark] .resume-banner{border-color:#435948}@media(min-width:1500px){.main-content{padding-left:65px;padding-right:65px}.home-heading h1{font-size:45px}.home-columns{grid-template-columns:minmax(0,1fr) 330px;gap:30px}.mode-copy>strong{font-size:13px}.mode-copy>span{font-size:11px}.mode-meta{font-size:10px}.topic-tabs>button{font-size:12px}.start-row>span{font-size:10px}.button{font-size:12px}.practice-panel,.exam-card{padding:29px}.exam-card h2{font-size:26px}.exam-card>p,.exam-card li{font-size:12px}.exam-best{font-size:10px}.stat-label{font-size:12px}.stat-bottom>span{font-size:10px}}@media(max-width:1200px){.sidebar{width:218px;padding-left:16px;padding-right:16px}.main-content{margin-left:218px;padding-left:30px;padding-right:30px}.home-columns{grid-template-columns:minmax(0,1fr) 265px;gap:20px}.practice-panel{padding:20px}.mode-meta{display:none}.start-row{align-items:stretch;flex-direction:column}.start-row>span{max-width:none}.exam-card{padding:23px 20px}.exam-card h2{font-size:21px}.home-heading h1{font-size:36px}.stat-card{padding:17px}.results-columns{grid-template-columns:1fr 1fr}}@media(max-width:1020px){.home-columns{grid-template-columns:1fr}.home-aside{display:grid;grid-template-columns:1fr 1fr;gap:20px}.weak-card{margin-top:0}.source-note{grid-column:1/-1;padding-top:0}.stats-grid{gap:12px}.stat-label{font-size:10px}.stat-bottom>span{font-size:8px}.results-columns{grid-template-columns:1fr}.statistics-totals{grid-template-columns:repeat(2,1fr)}.mode-meta{display:inline}.start-row{flex-direction:row;align-items:center}.topic-tabs>button{font-size:11px}.question-card{padding:28px}.question-card h1{font-size:23px}.quiz-actions{flex-wrap:wrap}.sources-grid{grid-template-columns:1fr}.heading-mark{margin-right:0}.heading-mark svg{width:60px;height:60px}.resume-banner{align-items:flex-start}.resume-banner>div{line-height:1.7}.resume-banner .text-button{flex-shrink:0}}@media(max-width:760px){.sidebar{display:none;top:57px;width:246px;box-shadow:10px 0 30px #0002;padding-top:25px}.sidebar.open{display:flex}.sidebar .brand{margin-bottom:30px}.mobile-bar{display:flex;position:sticky;top:0;height:57px;border-bottom:1px solid var(--border);background:var(--surface);align-items:center;justify-content:space-between;padding:0 16px;z-index:40}.mobile-brand{font-size:18px;font-weight:600;letter-spacing:-.8px}.mobile-brand>span{margin:0 7px;color:var(--green)}.mobile-overlay{display:block;position:fixed;top:57px;right:0;bottom:0;left:0;background:#0c201766;z-index:25}.main-content{margin-left:0;padding:0 24px 25px}.page-top{height:61px;font-size:10px}.home-heading{padding-top:30px}.home-heading h1{font-size:35px}.home-heading p:not(.eyebrow){font-size:11px}.stats-grid{margin-bottom:29px}.home-columns{gap:22px}.stat-number{font-size:29px}.mini-icon{padding:5px}.stat-bottom>span{line-height:1.7;font-size:9px}.stat-card{padding:15px}.heading-mark{display:none}.results-header h1{font-size:27px}.results-header{margin-top:28px}.result-score-panel{padding:20px}.big-grade{font-size:36px}.result-score-panel>div>strong{font-size:24px}.quiz-top{margin-top:26px}.question-card{padding:27px 24px 22px}.question-card h1{font-size:23px}.question-card .eyebrow{font-size:8px}.reset-panel{align-items:flex-start;flex-direction:column}.skip-link{left:15px}.topic-performance{gap:15px}.page-footer{font-size:8px}.surface{padding:22px}.standard-heading h1{font-size:32px}.brand-text{font-size:21px}}@media(max-width:480px){.main-content{padding:0 17px 20px}.page-top{height:54px}.course-label{font-size:9px}.home-heading h1{font-size:31px;letter-spacing:-1.1px}.home-heading{padding:27px 0 23px}.eyebrow{font-size:8px;letter-spacing:1.4px}.home-heading p:not(.eyebrow){font-size:10px}.stats-grid{gap:8px}.stat-card{padding:13px 10px;border-radius:8px}.stat-label{font-size:9px}.mini-icon{display:none}.stat-number{font-size:27px;margin:9px 0}.stat-number>span{font-size:14px}.stat-bottom>span{font-size:8px;min-height:26px;margin-bottom:8px}.section-heading h2{font-size:20px}.practice-panel{padding:18px 16px}.topic-tabs{gap:6px}.topic-tabs>button{padding:12px 5px;font-size:10px;gap:5px;min-height:44px}.topic-tabs>button>svg{width:13px}.topic-tabs>button>svg:last-child:not(:first-child){display:none}.mode-option{gap:10px;padding:13px 11px;min-height:67px}.mode-copy>strong{font-size:12px}.mode-copy>span{font-size:10px}.mode-meta{display:none}.mode-icon{width:32px;height:32px}.start-row{flex-direction:column;align-items:stretch;gap:12px}.start-row>span{text-align:center;font-size:9px}.button{font-size:12px;padding:13px 15px;min-height:46px}.home-aside{grid-template-columns:1fr;gap:18px}.exam-card{padding:24px}.exam-card h2{font-size:25px}.exam-card>p,.exam-card li{font-size:12px;max-width:none}.pill{font-size:8px}.exam-best{font-size:9px}.weak-card{padding:19px 22px}.weak-empty p{font-size:12px}.weak-empty>span:last-child{font-size:10px;max-width:none}.source-note p{font-size:10px}.source-note{padding:0 5px}.page-footer{flex-direction:column;gap:10px;margin-top:25px}.resume-banner{flex-direction:column;padding:13px;font-size:11px;gap:5px}.resume-banner .text-button{margin-left:29px;min-height:35px}.quiz-top{gap:9px;font-size:10px}.difficulty{font-size:8px}.question-card{padding:23px 16px 18px;border-radius:10px;margin-top:20px}.question-card h1{font-size:21px;line-height:1.5;letter-spacing:-.35px;margin-bottom:25px}.answer-option{padding:14px 11px;font-size:12px;gap:10px;line-height:1.7;min-height:60px}.option-key{height:24px;width:24px;font-size:10px}.option-state{width:17px}.feedback{padding:17px 15px}.feedback-title{font-size:12px;align-items:flex-start}.feedback-title>svg{flex-shrink:0;margin-top:2px}.feedback>p{font-size:12px}.remember>p{font-size:11px}.quiz-actions{flex-direction:column-reverse;align-items:stretch;gap:15px}.keyboard-hint{justify-content:center;font-size:8px}.quiz-save{font-size:9px;margin-bottom:20px}.result-score-panel{padding:20px 10px;grid-template-columns:1.2fr 1fr 1fr 1fr}.big-grade{font-size:30px}.big-grade>span{font-size:9px!important;margin-left:3px}.result-score-panel>div>strong{font-size:22px}.result-score-panel>div>span,.big-grade>small{font-size:9px}.result-actions{flex-direction:column;gap:10px}.grading-note{font-size:9px;padding:0 5px}.statistics-totals{gap:10px}.statistics-totals .stat-card{padding:17px}.statistics-totals .stat-label{font-size:11px}.topic-performance{grid-template-columns:1fr;gap:0}.surface{padding:22px 19px}.performance-row>div:first-child{font-size:11px}.error-card{padding:20px 17px}.error-card>h3{font-size:16px}.error-card .quiz-top{font-size:10px}.modal-card{padding:25px 22px}.modal-card>div{flex-direction:column-reverse}.modal-card h2{font-size:21px}.toast{font-size:11px;width:calc(100% - 34px);justify-content:center}.standard-heading h1{font-size:31px}.reference-links>a{font-size:10px;padding:12px 9px}.sources-grid h2{font-size:22px}.source-method p{font-size:12px}.error-review>.section-heading h2{font-size:21px}}@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}