:root{color-scheme:light;--paper:#f7f7f6;--card:#fff;--ink:#24272c;--muted:#777f8c;--line:#e7e9ed;--blue:#3976d2;--blue-soft:#edf4ff;--green:#258657;--green-soft:#edf8f1;--red:#c64e4e;--red-soft:#fff0ef;--shadow:0 14px 46px rgba(37,49,68,.065);font-family:"Noto Sans SC","Microsoft YaHei",sans-serif}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:var(--paper);color:var(--ink);font-size:15px}.exam-header{height:76px;display:flex;align-items:center;gap:22px;padding:0 max(24px,calc((100vw - 1120px)/2));background:rgba(255,255,255,.88);border-bottom:1px solid var(--line)}.exam-brand{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:#f1edea;color:#65544e;text-decoration:none;font-size:16px;font-weight:700}.exam-header h1{margin:0;font-size:18px;font-weight:650;letter-spacing:.02em}.exam-header-side{margin-left:auto;display:flex;align-items:center;gap:12px;font-size:13px}.header-label{color:var(--muted)}#headerBank{font-weight:600}.exam-wrap{width:min(1060px,calc(100% - 40px));margin:24px auto 56px}.exam-tabs{display:flex;align-items:center;gap:8px;margin-bottom:24px}.exam-tabs button{border:0;background:transparent;color:#646d79;padding:10px 15px;border-radius:9px;font:inherit;cursor:pointer;transition:background .15s,color .15s}.exam-tabs button:hover{background:#ebedf0}.exam-tabs button.active{background:var(--blue-soft);color:#2e66b8;font-weight:650}.exam-tabs .quiet-tab{margin-left:2px;font-size:13px}.quiet-tab span{display:inline-grid;place-items:center;min-width:20px;height:20px;margin-left:4px;padding:0 5px;background:#eef0f2;border-radius:99px;color:#66707c;font-size:11px}.tab-spacer{flex:1}.exam-notice{padding:12px 16px;margin:0 0 16px;border:1px solid #d8e4f5;border-radius:10px;background:#f3f7fc;color:#365b89}.exam-notice.error{border-color:#f0d2d0;background:#fff6f5;color:#9c3e3e}.hidden{display:none!important}.home-intro{display:flex;align-items:flex-end;justify-content:space-between;margin:28px 2px 20px;gap:20px}.eyebrow{text-transform:uppercase;letter-spacing:.11em;font:600 11px "DM Sans",sans-serif;color:#8b929d}.home-intro h2{margin:7px 0 6px;font-size:27px;font-weight:650}.home-intro p{margin:0;color:var(--muted);font-size:14px}.bank-select{min-width:180px;padding:10px 13px;border:1px solid var(--line);border-radius:9px;background:white;color:var(--ink);font:inherit}.bank-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.bank-card{position:relative;min-height:185px;padding:21px 22px 18px;border:1px solid var(--line);border-radius:15px;background:var(--card);box-shadow:0 5px 20px rgba(37,49,68,.025);display:flex;flex-direction:column;transition:transform .18s,box-shadow .18s}.bank-card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.bank-card h3{margin:0 0 7px;font-size:18px}.bank-card p{margin:0;color:var(--muted);font-size:13px;line-height:1.7}.bank-meta{margin-top:auto;padding-top:16px;display:flex;align-items:center;justify-content:space-between;color:#737b87;font-size:12px}.bank-meta b{color:#414953;font-weight:600}.bank-actions{display:flex;gap:7px}.button{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:39px;padding:8px 14px;border:1px solid var(--line);border-radius:9px;background:#fff;color:#333a44;font:500 13px inherit;font-family:inherit;cursor:pointer}.button:hover{background:#f6f8fa}.button.primary{border-color:var(--blue);background:var(--blue);color:#fff}.button.primary:hover{background:#2f69c0}.button:disabled{opacity:.55;cursor:not-allowed}.button.small{min-height:32px;padding:5px 10px;font-size:12px}.quick-actions{display:flex;flex-wrap:wrap;gap:10px;margin:17px 0 0}.quick-card{flex:1 1 170px;min-height:58px;display:flex;align-items:center;gap:11px;padding:11px 14px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink);text-align:left;font:inherit;cursor:pointer}.quick-card:hover{border-color:#cddbf0;background:#fbfdff}.quick-icon{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:#f0f4fa;color:#4f6c99;font-size:16px}.quick-card strong{display:block;font-size:13px}.quick-card small{display:block;margin-top:2px;color:var(--muted);font-size:11px}.resume-line{display:flex;align-items:center;gap:9px;margin:15px 0 0;padding:12px 15px;border:1px dashed #d9dee6;border-radius:11px;color:#66707d;font-size:13px}.resume-line button{margin-left:auto}.question-shell{max-width:830px;margin:0 auto}.question-card{padding:25px 28px 24px;border:1px solid var(--line);border-radius:16px;background:#fff;box-shadow:var(--shadow)}.question-meta{display:flex;align-items:center;gap:12px;color:#737b87;font-size:13px}.question-meta .bank-name{font-weight:600;color:#3e4650}.meta-spacer{flex:1}.question-number{color:#525b66;font-variant-numeric:tabular-nums}.progress-track{height:5px;margin:14px 0 19px;border-radius:99px;background:#e8edf4;overflow:hidden}.progress-track span{display:block;height:100%;border-radius:99px;background:var(--blue);transition:width .2s}.question-label-row{display:flex;align-items:center;gap:8px}.type-tag,.chapter-tag{display:inline-flex;align-items:center;min-height:24px;padding:3px 9px;border-radius:99px;background:#f1f3f6;color:#67717d;font-size:11px}.type-tag{background:#edf4ff;color:#3d69a7}.favorite-button{margin-left:auto;width:34px;height:34px;border:1px solid transparent;border-radius:9px;background:transparent;color:#8d95a1;font-size:21px;line-height:1;cursor:pointer}.favorite-button:hover,.favorite-button.on{background:#fff8e8;color:#c69328}.question-stem{margin:22px 0 20px;font-size:21px;line-height:1.75;font-weight:600;letter-spacing:.005em;white-space:pre-wrap}.options{display:grid;gap:10px}.option{width:100%;display:flex;align-items:flex-start;gap:13px;padding:13px 15px;border:1px solid #e3e6eb;border-radius:11px;background:#fff;color:#343a43;text-align:left;font:inherit;font-size:15px;line-height:1.65;cursor:pointer;transition:border .15s,background .15s,transform .12s}.option:hover:not(:disabled){border-color:#91b2e4;background:#f9fbff;transform:translateY(-1px)}.option-letter{flex:0 0 28px;display:grid;place-items:center;width:28px;height:28px;border:1px solid #d9dee7;border-radius:50%;color:#747e8c;font:600 12px "DM Sans",sans-serif}.option.selected{border-color:#7da5df;background:var(--blue-soft);color:#244f8e}.option.selected .option-letter{border-color:#4c7dc3;background:#4c7dc3;color:white}.option.correct{border-color:#81c79f;background:var(--green-soft);color:#226b45}.option.correct .option-letter{border-color:var(--green);background:var(--green);color:white}.option.wrong{border-color:#e1a09b;background:var(--red-soft);color:#983d3c}.option.wrong .option-letter{border-color:var(--red);background:var(--red);color:#fff}.option:disabled{cursor:default;opacity:1}.feedback{margin-top:17px;padding:15px 16px;border-radius:11px;background:#f6f8fa;color:#404852;font-size:13px;line-height:1.8}.feedback.correct{background:var(--green-soft)}.feedback.wrong{background:var(--red-soft)}.feedback-head{display:flex;align-items:center;gap:7px;margin-bottom:5px;font-weight:700}.feedback.correct .feedback-head{color:#217449}.feedback.wrong .feedback-head{color:#a23e3c}.source-line{margin-top:8px;color:#6e7783;font-size:12px}.question-controls{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:15px 0}.question-controls .button{min-width:108px}.control-status{color:#7a828e;font-size:12px}.answer-sheet{margin-top:12px;padding:18px 20px 17px;border:1px solid var(--line);border-radius:14px;background:#fff}.sheet-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}.sheet-head h3{margin:0;font-size:14px}.sheet-toggle{margin-left:auto}.sheet-counts{color:#78818d;font-size:12px}.sheet-counts b{color:#505965}.sheet-grid{display:grid;grid-template-columns:repeat(10,minmax(0,1fr));gap:7px}.sheet-grid[hidden]{display:none}.feedback-pending{color:#586677}.sheet-item{aspect-ratio:1.25/1;border:1px solid #e2e5e9;border-radius:7px;background:#f0f1f3;color:#67717e;font:500 12px "DM Sans",sans-serif;cursor:pointer}.sheet-item.answered{border-color:#c4dfce;background:var(--green-soft);color:#287a50}.sheet-item.current{border-color:var(--blue);background:var(--blue);color:#fff;box-shadow:0 0 0 2px rgba(57,118,210,.13)}.sheet-item.wrong-state:not(.current){border-color:#edcfca;background:#fff5f4;color:#a84d47}.exam-status-bar{display:flex;align-items:center;gap:18px;margin:-3px 0 13px;padding:11px 14px;border-radius:10px;background:#fff;border:1px solid var(--line);font-size:12px;color:#69727f}.exam-status-bar b{color:#313944;font-weight:650}.timer{margin-left:auto;font:600 15px "DM Sans",sans-serif;color:#445b7a}.timer.urgent{color:var(--red)}.results{max-width:860px;margin:0 auto}.result-card{padding:23px;border:1px solid var(--line);border-radius:15px;background:#fff;box-shadow:var(--shadow)}.result-card h2{margin:0 0 5px;font-size:22px}.result-subtitle{margin:0;color:var(--muted);font-size:13px}.score-row{display:flex;align-items:stretch;gap:10px;margin-top:20px}.score-main{display:grid;place-content:center;min-width:145px;padding:12px 20px;border-radius:12px;background:#eef4fc;color:#365f96;text-align:center}.score-main b{font:700 42px "DM Sans",sans-serif;line-height:1.1}.score-main span{margin-top:5px;font-size:12px}.score-metric{flex:1;display:grid;place-content:center;min-width:80px;padding:10px;border:1px solid var(--line);border-radius:12px;text-align:center}.score-metric b{font:650 22px "DM Sans",sans-serif}.score-metric span{margin-top:4px;color:var(--muted);font-size:11px}.review-list{display:grid;gap:10px;margin-top:17px}.review-item{padding:15px;border:1px solid var(--line);border-radius:12px;background:#fff}.review-title{display:flex;gap:9px;align-items:flex-start}.review-title strong{font-size:13px;line-height:1.6}.result-mark{flex:0 0 auto;display:grid;place-items:center;width:22px;height:22px;border-radius:50%;background:var(--green-soft);color:var(--green);font-size:12px}.result-mark.wrong{background:var(--red-soft);color:var(--red)}.review-options{display:grid;gap:5px;margin:10px 0;color:#69727e;font-size:12px;line-height:1.6}.review-options .is-correct{color:#24774a;font-weight:650}.review-explanation{margin:8px 0 0;padding:10px 12px;border-radius:8px;background:#f6f7f9;color:#535d69;font-size:12px;line-height:1.75}.review-source{margin-top:7px;color:#858c96;font-size:11px}.mistake-list{display:grid;gap:12px}.mistake-card{padding:19px 20px;border:1px solid var(--line);border-radius:13px;background:#fff}.mistake-top{display:flex;align-items:center;gap:10px;color:#727b87;font-size:12px}.mistake-top strong{color:#3d4651}.mistake-card h3{margin:10px 0 0;font-size:16px;line-height:1.65}.mistake-actions{display:flex;gap:8px;margin-top:14px}.empty-state{padding:58px 20px;border:1px dashed #d5dae1;border-radius:14px;background:rgba(255,255,255,.7);text-align:center}.empty-state h2{margin:0 0 7px;font-size:18px}.empty-state p{margin:0;color:var(--muted);font-size:13px}.stats-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.stat-card{padding:19px;border:1px solid var(--line);border-radius:13px;background:white}.stat-card span{color:var(--muted);font-size:12px}.stat-card b{display:block;margin-top:9px;font:650 26px "DM Sans","Noto Sans SC",sans-serif}.history-list{margin-top:25px}.history-list h3{font-size:15px}.history-row{display:flex;align-items:center;gap:15px;padding:12px 0;border-bottom:1px solid var(--line);font-size:13px}.history-row time{color:var(--muted);margin-left:auto}.history-score{font-weight:700;color:#456d9e}.exam-footer{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:18px max(24px,calc((100vw - 1060px)/2));border-top:1px solid var(--line);color:#9299a3;font-size:11px}.exam-footer a{color:#6b7380;text-decoration:none}.exam-footer a:hover{text-decoration:underline}.setup-row{display:flex;align-items:center;flex-wrap:wrap;gap:10px;margin-bottom:15px;padding:13px 15px;border:1px solid var(--line);border-radius:11px;background:#fff}.setup-row label{display:flex;align-items:center;gap:8px;color:#59626e;font-size:12px}.setup-row select{padding:7px 10px;border:1px solid var(--line);border-radius:7px;background:#fff;color:#3e4651;font:inherit;font-size:12px}.setup-row .button{margin-left:auto}
@media(max-width:700px){.exam-header{height:64px;padding:0 17px;gap:12px}.exam-brand{width:34px;height:34px}.exam-header h1{font-size:15px}.exam-header-side{gap:6px;display:block;text-align:right;font-size:12px}.header-label{display:none}.exam-wrap{width:calc(100% - 24px);margin-top:15px}.exam-tabs{gap:3px;overflow:auto;padding-bottom:2px;margin-bottom:17px}.exam-tabs button{flex:0 0 auto;padding:9px 10px;font-size:12px}.exam-tabs .quiet-tab{margin-left:0}.home-intro{align-items:flex-start;flex-direction:column;margin:20px 2px 15px}.home-intro h2{font-size:23px}.bank-select{width:100%}.bank-grid{grid-template-columns:1fr;gap:10px}.bank-card{min-height:150px;padding:18px}.question-card{padding:18px 15px 17px;border-radius:13px}.question-meta{gap:7px;font-size:11px}.question-stem{margin:18px 0 17px;font-size:18px;line-height:1.7}.option{padding:11px 10px;gap:10px;font-size:14px}.option-letter{width:26px;height:26px;flex-basis:26px}.question-controls .button{min-width:92px;padding:8px 10px}.control-status{font-size:11px}.answer-sheet{padding:15px 12px}.sheet-grid{grid-template-columns:repeat(7,minmax(0,1fr));gap:6px}.sheet-item{font-size:11px;aspect-ratio:1.15/1}.exam-status-bar{gap:10px;padding:10px;font-size:11px}.timer{font-size:13px}.score-row{gap:6px}.score-main{min-width:95px;padding:8px}.score-main b{font-size:34px}.score-metric{min-width:0;padding:7px 4px}.score-metric b{font-size:17px}.score-metric span{font-size:10px}.stats-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.stat-card{padding:14px}.stat-card b{font-size:23px}.exam-footer{padding:15px 16px;align-items:flex-start;flex-direction:column}.setup-row{gap:8px}.setup-row .button{width:100%;margin:3px 0 0}.history-row{gap:8px;font-size:11px}}

/* Minimal study start screen */
.loading-option{height:54px;margin:10px 0;border:1px solid var(--line);border-radius:11px;background:#fafbfc}.loading-progress{width:18%!important;opacity:.55}.loading-note{margin:16px 0 0;color:var(--muted);font-size:12px}
.exam-brand,.exam-footer{display:none}
.exam-header{gap:0}
.exam-header h1{font-size:19px}
.exam-wrap{max-width:900px}
.exam-tabs{margin-bottom:18px}
.study-start{max-width:620px;margin:72px auto;padding:34px 36px;border:1px solid var(--line);border-radius:14px;background:#fff}
.study-start h2{margin:0 0 8px;font-size:23px;font-weight:600}
.study-start>p{margin:0;color:var(--muted);font-size:14px;line-height:1.7}
.bank-label{display:block;margin:27px 0 8px;color:#505965;font-size:13px}
.study-start .bank-select{width:100%;min-height:46px}
.study-actions{display:flex;gap:10px;margin-top:18px}
.study-actions .button{min-width:130px}
.study-note{margin-top:20px!important;font-size:12px!important}
.resume-actions{margin-top:10px}
.exam-setup{margin-top:18px}
.exam-setup .button{min-width:120px}
@media(max-width:640px){
  .study-start{margin:36px auto;padding:25px 20px}
  .exam-header{height:62px;padding:0 18px}
  .exam-header h1{font-size:17px}
  .exam-header-side{gap:6px;font-size:11px}
  .exam-tabs{gap:5px}
  .exam-tabs button{padding:9px 12px;font-size:13px}
  .study-actions{flex-direction:column}
  .study-actions .button{width:100%}
}