:root{--primary: #3056d3;--bg: #f6f7fb;--card-bg: #ffffff;--text: #222;--muted: #666;--border: #d9deea;--correct-bg: #e6f5ea;--correct-border: #2c7a34;--incorrect-bg: #fdeaea;--incorrect-border: #c62828;--multi-hint: #8853ff}.exam-root{font-family:Segoe UI,Microsoft YaHei,sans-serif;color:var(--text);background:var(--bg);width:100%;overflow-x:hidden}.exam-root *{box-sizing:border-box}.exam-header{background:var(--card-bg);border-bottom:1px solid var(--border);padding:1.5rem clamp(1rem,3vw,3rem)}.exam-header h1{margin:0 0 .5rem;font-size:clamp(1.6rem,4vw,2.2rem)}.exam-header .subtitle{margin:0;color:var(--muted);font-size:.95rem}.exam-header .header-row{display:flex;align-items:center;justify-content:space-between;gap:1rem}.back-button{background:#fff;color:var(--primary);border:1px solid var(--primary);padding:.55rem .9rem;border-radius:8px;cursor:pointer;transition:border-color .2s ease,box-shadow .2s ease}.back-button:hover{background:#3056d314}.exam-layout{display:grid;grid-template-columns:minmax(250px,320px) 1fr;gap:1.5rem;padding:clamp(1rem,3vw,2rem);width:100%;min-width:0}.exam-controls{background:var(--card-bg);border:1px solid var(--border);border-radius:12px;padding:1.5rem;display:flex;flex-direction:column;gap:1rem;position:sticky;top:1.5rem;align-self:start}.control-group{display:flex;flex-direction:column;gap:.5rem;min-width:0}.exam-root label{font-weight:600}.exam-root select,.exam-root button{font:inherit;padding:.55rem .75rem;border-radius:8px;border:1px solid var(--border);background:#fff;transition:border-color .2s ease,box-shadow .2s ease}.exam-root select:focus,.exam-root button:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #3056d326}.exam-root button{cursor:pointer;background:var(--primary);color:#fff;border-color:transparent}.exam-root button:disabled{opacity:.6;cursor:not-allowed}.compact-select{position:relative;width:100%;min-width:0}.compact-select-trigger{width:100%;min-height:42px;display:flex;align-items:center;justify-content:space-between;gap:.75rem;background:#fff!important;color:var(--text)!important;border-color:var(--border)!important;text-align:left}.compact-select-trigger span:first-child{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.compact-select-caret{flex:0 0 auto;color:var(--muted);font-size:1.1rem;line-height:1}.compact-select-menu{position:absolute;z-index:80;top:calc(100% + .35rem);left:0;right:0;max-height:min(330px,60vh);overflow-y:auto;overflow-x:hidden;background:#fff;border:1px solid var(--border);border-radius:8px;box-shadow:0 16px 36px #1e1e3c29}.compact-select-option{width:100%;min-height:40px;display:block;padding:.55rem .75rem;border:0!important;border-radius:0!important;background:#fff!important;color:var(--text)!important;text-align:left;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.compact-select-option:hover,.compact-select-option.active{background:#eef3ff!important;color:var(--primary)!important}.random-actions{display:flex;gap:.75rem}.random-actions button{flex:1}.info-bar{font-size:.9rem;color:var(--muted)}.exam-content{display:flex;flex-direction:column;gap:1.5rem;width:100%;min-width:0}.question-list{display:flex;flex-direction:column;gap:1rem;width:100%;min-width:0}.empty-message{padding:1.5rem;text-align:center;color:var(--muted);background:var(--card-bg);border:1px dashed var(--border);border-radius:12px}.question-card{background:var(--card-bg);border:1px solid var(--border);border-radius:12px;padding:1.25rem;display:flex;flex-direction:column;gap:.75rem;box-shadow:0 4px 18px #1e1e3c0d;width:100%;max-width:100%}.question-header{display:flex;justify-content:space-between;align-items:center;gap:1rem;font-weight:600}.question-meta{color:var(--muted);font-size:.85rem}.question-text{line-height:1.6;white-space:pre-wrap;word-break:break-word}.options{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:.5rem}.options button{width:100%;text-align:left;background:#f4f7ff;color:var(--text);border:1px solid transparent;transition:transform .15s ease,border-color .15s ease;word-break:break-word}.options button:hover:not(.disabled){transform:translateY(-1px);border-color:var(--primary)}.options button.correct{background:var(--correct-bg);border-color:var(--correct-border);color:var(--correct-border)}.options button.incorrect{background:var(--incorrect-bg);border-color:var(--incorrect-border);color:var(--incorrect-border)}.options button.disabled{cursor:default;opacity:.75}.actions{display:flex;gap:.75rem}.actions button{background:#fff;color:var(--primary);border:1px solid var(--primary);flex:0 0 auto}.actions button:hover{background:#3056d314}.answer-block{border-top:1px dashed var(--border);padding-top:.75rem;font-size:.95rem;line-height:1.6}.answer-block.hidden,.random-area.hidden{display:none}.exam-root .hidden{display:none!important}.answer-block .analysis{margin:.5rem 0 0;color:var(--muted);white-space:pre-wrap}.random-area{background:var(--card-bg);border:1px solid var(--border);border-radius:12px;padding:1.5rem;display:flex;flex-direction:column;gap:1rem;width:100%;max-width:100%}.random-area .hint{margin:0;color:var(--muted);font-size:.9rem}.multi-label{color:var(--multi-hint);font-size:.85rem;margin-left:.5rem}@media(max-width:960px){.exam-layout{grid-template-columns:1fr}.exam-controls{position:static}}@media(max-width:600px){.exam-header{padding:1rem}.exam-layout{width:100%;max-width:100vw;padding:.75rem .75rem 1.5rem;margin:0}.exam-content,.question-list,.question-card,.random-area{max-width:100%}}@media(max-width:450px){.exam-root,.exam-header,.exam-layout{width:100vw;margin-left:calc(50% - 50vw)}.exam-layout{overflow-x:hidden;padding:.75rem .5rem 1.25rem}.exam-controls,.exam-content{min-width:0}}