/* MCQ scope selection and first-choice practice flow. */
.learning-shell .subject-main .module-actions{display:flex;flex-direction:column;align-items:stretch;gap:8px;flex:0 0 142px;margin-left:0;width:142px}
.learning-shell .subject-main .module-actions .button{width:100%}
.learning-shell .subject-main .module-row{flex-wrap:nowrap}
.learning-shell .subject-main .module-detail{min-width:0;flex:1}
.learning-shell .mcq-start{width:min(780px,calc(100% - 40px));margin:32px auto;padding:12px 0}
.mcq-start-heading{margin:30px 0 24px}.mcq-start-heading h1{font-size:28px;letter-spacing:-.5px}.mcq-start-heading p{color:#75826c;font-size:13px}.mcq-start-heading .eyebrow{margin-bottom:12px}
.mcq-mode-list{display:grid;gap:12px;margin-bottom:20px}.mcq-mode-card{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:24px;border:1px solid #ced9c8;border-radius:10px;text-align:left;background:#fff;color:#173e32}.mcq-mode-card:hover{background:#f0f6ec;border-color:#86a580}.mcq-mode-card strong{font-size:17px}.mcq-mode-card>span{font-size:13px;color:#647a59;white-space:nowrap}.mcq-mode-card>span>span{margin-left:20px}
.mcq-toolbar-actions{display:flex;align-items:center;gap:8px}.mcq-mode-label{font-size:11px;color:#78876e}.mcq-toolbar-actions .button{font-size:11px;padding:7px 11px}.mcq-toolbar-actions [aria-pressed=true],.mcq-explanation-heading [aria-pressed=true]{background:#eaf2e4;border-color:#8fa77d}
.mcq-explanation-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:12px}.learning-shell .mcq-explanation-heading h3{margin:0}.mcq-explanation-heading .button{font-size:11px;padding:6px 10px}
.mcq-content .language-label{display:none}.mcq-content .language-block{padding-top:0}.mcq-content .lang-zh{margin-top:8px;padding-top:8px}
.mcq-content [data-option][aria-disabled=true]{cursor:default}.mcq-content .answer-result .button{display:block;margin-top:8px}
.mcq-summary-actions{display:flex;gap:12px;flex-wrap:wrap}.mcq-accuracy{font-size:64px;line-height:1.2;font-weight:700;color:#173e32;margin:24px 0}
@media(max-width:850px){.learning-shell .subject-main .module-actions{flex-basis:120px;width:120px}.learning-shell .subject-main .module-actions .button{padding:9px 10px;font-size:11px}}
@media(max-width:540px){.learning-shell .subject-main .module-actions{flex-basis:98px;width:98px;gap:6px}.learning-shell .subject-main .module-actions .button{padding:8px 5px;font-size:10px}.learning-shell .subject-main .module-row{gap:8px}.learning-shell .subject-main .module-num{min-width:22px}.mcq-start-heading h1{font-size:23px}.mcq-mode-card{padding:20px 16px}.mcq-mode-card strong{font-size:15px}.mcq-mode-label{font-size:9px}.mcq-toolbar-actions{gap:6px}.mcq-toolbar-actions .button{font-size:10px;padding:6px 8px}.mcq-content .quiz-submit{align-items:flex-start}.learning-shell .mcq-content .quiz-submit .button{font-size:11px;padding:9px 12px}}
.quiz-side-switch{display:flex;flex-direction:column;gap:8px;margin:0 0 18px}.quiz-side-switch .button{width:100%;font-size:12px;padding:10px 6px;gap:4px}
.module-completion{display:flex;gap:20px;flex:0 0 180px;justify-content:center;color:#7a8d72;font-size:11px}.module-completion>span{display:flex;flex-direction:column;gap:3px}.module-completion strong{font-size:22px;color:#31563c;font-weight:600}
@media(max-width:1100px){.module-completion{flex-basis:120px;gap:14px}.module-completion strong{font-size:18px}}
@media(max-width:700px){.learning-shell .subject-main .module-row{display:grid;grid-template-columns:26px minmax(0,1fr) 98px}.learning-shell .subject-main .module-num{grid-column:1;grid-row:1}.learning-shell .subject-main .module-detail{grid-column:2;grid-row:1}.learning-shell .subject-main .module-actions{grid-column:3;grid-row:1 / 3}.module-completion{grid-column:2;grid-row:2;justify-content:flex-start;gap:16px;font-size:10px}.module-completion>span{flex-direction:row;align-items:center;gap:5px}.module-completion strong{font-size:13px}}
@media(max-width:540px){.learning-shell .quiz-sidebar{position:sticky;top:0;z-index:24;background:#fbfcf9;flex-wrap:wrap}.quiz-side-switch{order:1;flex-direction:row;gap:5px;margin:0;flex:0 0 auto}.quiz-side-switch .button{font-size:10px;padding:6px 8px;width:auto}.learning-shell .quiz-sidebar .number-grid{order:2;flex-basis:100%}.learning-shell .quiz-sidebar .study-navigation{flex:1}}