:root{
  --dd-brand:#0a978b;--dd-brand-dark:#08796f;--dd-brand-soft:#e7f7f4;--dd-line:#cfe3e0;
  --dd-bg:#f3faf9;--dd-card:#fff;--dd-text:#162925;--dd-muted:#6f817d;--dd-danger:#ef5350;
  --dd-success:#20ad72;--dd-warning:#f3a536;--dd-shadow:0 12px 34px rgba(28,77,69,.09);
}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:system-ui,-apple-system,"Segoe UI","Microsoft YaHei",Arial,sans-serif;color:var(--dd-text);background:linear-gradient(180deg,#fff 0,#eff9f8 60%,#f8fcfb 100%)}
button,input{font:inherit}button{color:inherit}.dd-auth-pending body{visibility:hidden}.dd-auth-fallback-visible body{visibility:visible}
[hidden]{display:none!important}.dd-resolution-stage{min-height:100vh}.dd-screen{min-width:1024px}.dd-page-shell{width:min(1760px,calc(100vw - 28px));margin:0 auto}
.dd-topbar{height:64px;background:rgba(255,255,255,.96);border-top:2px solid var(--dd-brand);border-bottom:1px solid #e2efed;position:sticky;top:0;z-index:50;backdrop-filter:blur(12px)}
.dd-header-inner{height:100%;display:flex;align-items:center;gap:42px}.dd-brand{display:flex;align-items:center;gap:10px;min-width:220px}.dd-logo{width:36px;height:36px;object-fit:contain}.dd-brand-title{font-size:21px;font-weight:900;color:#087e74;line-height:1}.dd-brand-sub{font-size:10px;letter-spacing:1.4px;color:#76a19a;margin-top:4px}.dd-version-badge{font-size:10px;color:#188d82;margin-top:2px}
.dd-nav{height:100%;display:flex;align-items:stretch;gap:4px}.dd-nav-item{min-width:104px;padding:0 20px;display:flex;align-items:center;justify-content:center;text-decoration:none;font-size:16px;font-weight:800;color:#263b37;border-bottom:3px solid transparent}.dd-nav-item:hover,.dd-nav-item.active{color:#068e82;background:#f6fbfa;border-bottom-color:#09a496}.dd-nav-vip-active::after{content:'VIP';font-size:9px;color:#d99a12;margin-left:5px}
.dd-layout{display:grid;grid-template-columns:200px minmax(0,1fr);gap:14px;padding:12px 0 20px;align-items:stretch}.dd-left{display:flex;flex-direction:column;gap:10px;height:100%;align-self:stretch}.dd-left>.dd-side-card:nth-child(2){flex:1}.dd-side-card{background:#fff;border:1px solid #dceae8;border-radius:12px;padding:10px;box-shadow:0 4px 14px rgba(42,96,88,.05)}.dd-side-title{font-size:13px;font-weight:900;margin-bottom:8px}.dd-bank-card{width:100%;border:0;background:#f0f8f7;border-radius:9px;display:grid;grid-template-columns:28px 1fr 14px;align-items:center;text-align:left;padding:10px 8px;cursor:pointer}.dd-bank-card:hover{background:#e4f5f2}.dd-bank-card b{font-size:13px}.dd-bank-card em{display:block;font-style:normal;font-size:10px;color:var(--dd-muted)}.dd-bank-card i{font-style:normal;color:#0a8f84;font-size:20px}.dd-bank-icon{font-size:18px}.dd-bank-mode-badge{grid-column:2/3;display:inline-flex;width:max-content;margin-top:4px;border-radius:999px;padding:2px 7px;background:#e2f5f1;color:#087f75;font-size:9px;font-weight:800}.dd-bank-mode-badge.optimized{background:#fff1d6;color:#9c6800}
.dd-mode-btn{width:100%;height:38px;margin:4px 0;border:1px solid #d8e8e5;background:#fff;border-radius:8px;text-align:left;padding:0 11px;font-weight:700;cursor:pointer;display:flex;gap:9px;align-items:center}.dd-mode-btn:hover{border-color:#66c3ba;background:#f6fbfa}.dd-mode-btn.active{border-color:#0a9c90;background:#07978b;color:#fff;box-shadow:0 4px 10px rgba(7,151,139,.18)}.dd-mode-btn.dd-vip-locked{opacity:.7}.dd-mode-btn.dd-vip-locked::after{content:'VIP';margin-left:auto;font-size:9px;color:#d99a12}.dd-mode-btn.active.dd-vip-locked::after{color:#fff}
.dd-progress-card{margin-top:0}.dd-progress-row{display:flex;align-items:center;gap:12px}.dd-ring{--p:0;width:58px;height:58px;border-radius:50%;display:grid;place-items:center;background:conic-gradient(var(--dd-brand) calc(var(--p)*1%),#e6efed 0);position:relative}.dd-ring::before{content:'';position:absolute;inset:7px;border-radius:50%;background:#fff}.dd-ring span{position:relative;font-size:12px;font-weight:900}.dd-progress-data{font-size:11px;color:var(--dd-muted);display:grid;gap:6px}.dd-progress-data b{color:#087e74;font-size:13px}.dd-outline-wide{width:100%;height:32px;margin-top:8px;border:1px solid #b9d8d3;background:#fff;border-radius:7px;color:#087f75;cursor:pointer;font-size:12px;font-weight:700}
.dd-main{min-width:0;display:flex;flex-direction:column;gap:10px}.dd-question-card,.dd-sheet-card{background:#fff;border:1px solid #d7e8e5;border-radius:12px;box-shadow:var(--dd-shadow);overflow:visible}.dd-question-head{height:40px;display:flex;align-items:center;border-bottom:1px solid #dce9e7;padding:0 14px}.dd-q-meta{display:flex;align-items:center;gap:10px;min-width:0}.dd-study-breadcrumb{font-size:12px;font-weight:800;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.dd-q-meta strong{font-size:12px;color:#0a8f84;white-space:nowrap}.dd-mode-label{font-size:10px;color:#0b8c82;background:#eaf7f5;border:1px solid #b9e1dc;border-radius:999px;padding:2px 7px}

/* DD-PC-PRACTICE-V2.2.1.4.1 seven-item visual and optimized-bank closure */
.dd-question-body{height:400px;display:grid;grid-template-columns:minmax(0,1fr) minmax(350px,38%);column-gap:clamp(20px,2vw,34px);padding:18px 22px 14px;overflow:hidden;background:#fff}
.dd-question-left{min-width:0;min-height:0;overflow-y:auto;overflow-x:hidden;scrollbar-gutter:stable;padding:0 10px 4px 0;overscroll-behavior:contain}
.dd-question-right{min-width:0;min-height:0;display:flex;flex-direction:column;justify-content:space-between;gap:12px}
.dd-question-body.no-media .dd-question-right{justify-content:flex-end}
.dd-question-title-row{display:flex;align-items:flex-start;gap:10px;margin-bottom:12px}
.dd-type-badge{flex:0 0 auto;border:1px solid #8ed3c9;background:#effaf8;color:#078478;border-radius:999px;padding:3px 10px;font-size:12px;font-weight:800;margin-top:2px}
.dd-question-title{margin:0;font-size:22px;line-height:1.55;font-weight:900;white-space:normal;word-break:normal;overflow-wrap:break-word}
.dd-network-status{border-radius:8px;padding:8px 12px;font-size:12px;margin-bottom:8px}.dd-network-status.loading{background:#fff8e7;color:#8f6500}.dd-network-status.error{background:#fff0ef;color:#b93835}
.dd-options{display:flex;flex-direction:column;align-items:stretch;gap:6px}
.dd-option{width:100%;max-width:100%;border:0;background:transparent;border-radius:8px;padding:8px 10px;display:flex;align-items:flex-start;text-align:left;cursor:pointer;font-size:18px;line-height:1.58}
.dd-option:hover{background:#f0f8f7}.dd-option.selected{background:#e5f7f4;box-shadow:inset 0 0 0 1px #51bdb1}
.dd-option.dd-option-evaluated{background:transparent;box-shadow:none}.dd-option.dd-option-evaluated:hover{background:#f7fbfa}
.dd-letter{flex:0 0 38px;font-weight:900;color:#087f75}.dd-option-text{min-width:0;white-space:normal;word-break:normal;overflow-wrap:break-word}.dd-option-content{display:inline}.dd-option-result{display:inline-block;margin-left:10px;font-size:22px;line-height:1;font-weight:1000;vertical-align:-1px}.dd-option-result-correct .dd-option-result{color:#19a965}.dd-option-result-wrong .dd-option-result{color:#e84f4b}
.dd-nowrap-token{display:inline-block;white-space:nowrap}
.dd-confirm{height:44px;border:1px solid #07988c;background:#07988c;color:#fff;border-radius:9px;font-weight:900;cursor:pointer}.dd-confirm:disabled{opacity:.45;cursor:not-allowed}
.dd-question-media{display:flex;flex-direction:column;align-items:center;justify-content:flex-start;width:100%;min-width:0;min-height:0}.dd-question-body.no-media .dd-question-media{display:none}
.dd-media-frame{width:100%;height:230px;display:flex;align-items:center;justify-content:center;background:transparent;border:0;border-radius:0;overflow:hidden;box-shadow:none!important;filter:none!important}.dd-question-media,.dd-question-media img{box-shadow:none!important;filter:none!important}.dd-question-media img{max-width:100%;max-height:230px;object-fit:contain;display:block;background:transparent}.dd-view-image{border:0;background:transparent;color:#385d57;font-size:12px;margin-top:5px;cursor:pointer}.dd-media-loading .dd-media-frame::after{content:'图片加载中…';color:#81918d;font-size:12px}.dd-media-loading img{display:none}
.dd-answer-pad{width:100%;align-self:stretch}.dd-answer-pad-options{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:7px}.dd-answer-pad-options>.dd-answer-pad-btn:first-child{grid-column:3}.dd-answer-pad-judge .dd-answer-pad-options>.dd-answer-pad-btn:first-child{grid-column:5}.dd-answer-pad-judge .dd-answer-pad-options{grid-template-columns:repeat(6,minmax(0,1fr))}.dd-answer-pad-multiple .dd-confirm{width:calc((100% - 7px)/3);display:block;margin:9px 0 0 auto}.dd-answer-pad-btn{height:50px;border:1.5px solid #079a8e;background:#fff;border-radius:9px;color:#087e74;font-size:20px;font-weight:900;cursor:pointer}.dd-answer-pad-btn:hover,.dd-answer-pad-btn.selected{background:#e2f7f3}.dd-answer-pad-btn.correct,.dd-answer-pad-btn.answer-correct{background:#e1f7e8;border-color:#32a964;color:#18783e}.dd-answer-pad-btn.wrong{background:#ffedec;border-color:#e95f5a;color:#b22f2c}.dd-answer-pad .dd-confirm{width:100%;margin-top:9px}
.dd-answer-row{border-top:1px dashed #d2e4e1;padding-top:9px;margin-top:10px;display:flex;align-items:center;gap:10px;font-size:14px;flex-wrap:wrap}.dd-answer-row[hidden]{display:none}.dd-answer-label{color:#5e716d}.dd-answer-letters{display:flex;gap:5px}.dd-answer-letter{font-weight:900}.wrong-answer{color:#e24743}.dd-right-answer{color:#0a8a5a;font-weight:800}.dd-feedback{font-size:13px}
.dd-practice-control{border-top:1px solid #dce9e7;padding-top:3px}.dd-control-toolbar{display:grid;grid-template-columns:minmax(0,1fr) minmax(350px,38%);column-gap:clamp(20px,2vw,34px);padding:10px 22px;position:relative}.dd-control-spacer{min-width:0}.dd-operation-toolbar{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:7px;align-items:center}.dd-action-outline{height:40px;border:1px solid #c5dcd8;background:#fff;border-radius:8px;padding:0 8px;color:#20443e;font-size:13px;font-weight:800;cursor:pointer;white-space:nowrap}.dd-action-outline:hover{border-color:#42afa5;background:#f0f8f7}.dd-action-outline.active{border-color:#07988c;background:#e4f7f3;color:#087e74}.dd-action-outline:disabled{opacity:.5;cursor:not-allowed}.dd-nav-action{width:100%;min-width:0}.dd-preference-wrap{position:relative;min-width:0}.dd-preference-wrap>.dd-action-outline{width:100%}.dd-preference-button[aria-expanded='true']{border-color:#07988c;background:#e4f7f3}.dd-preference-panel{position:absolute;right:0;bottom:48px;width:350px;z-index:40;background:#fff;border:1px solid #a9d3cd;border-radius:12px;box-shadow:0 18px 50px rgba(20,70,63,.2);overflow:hidden}.dd-preference-head{display:flex;justify-content:space-between;align-items:center;padding:14px 15px;border-bottom:1px solid #dce9e7;background:#f7fbfa}.dd-preference-head b{display:block}.dd-preference-head span{display:block;font-size:11px;color:#788984}.dd-preference-head em{font-style:normal;font-size:11px;color:#0b9b8e}.dd-preference-official{margin:11px 14px;width:calc(100% - 28px);height:38px;border:1px solid #c4dcd8;background:#fff;border-radius:8px;font-weight:800;cursor:pointer}.dd-preference-group-title{font-size:11px;font-weight:900;color:#667a75;padding:0 15px 7px}.dd-feature-switch{display:grid;grid-template-columns:1fr 48px;align-items:center;gap:10px;padding:9px 15px;border-top:1px solid #edf3f2;cursor:pointer}.dd-feature-copy b{display:block;font-size:13px}.dd-feature-copy small{display:block;color:#7b8c88;font-size:10px;margin-top:2px}.dd-feature-switch input{position:absolute;opacity:0;pointer-events:none}.dd-toggle-ui{width:46px;height:25px;border-radius:999px;background:#cbdad7;padding:3px;justify-self:end;transition:.2s}.dd-toggle-ui i{display:block;width:19px;height:19px;border-radius:50%;background:#fff;box-shadow:0 1px 4px rgba(0,0,0,.2);transition:.2s}.dd-feature-switch input:checked+.dd-toggle-ui{background:#0aa395}.dd-feature-switch input:checked+.dd-toggle-ui i{transform:translateX(21px)}.dd-feature-switch input:disabled+.dd-toggle-ui{opacity:.45}
.dd-explain-dock{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:12px;padding:0 22px 18px}.dd-explain-dock.dd-explain-three-column{grid-template-columns:repeat(3,minmax(0,1fr))}.dd-explain-card{height:166px;border:1px solid #cce1de;border-radius:10px;overflow:hidden;background:#fff;cursor:pointer}.dd-panel-title{height:42px;display:flex;align-items:center;justify-content:space-between;padding:0 15px;background:#f3faf8;color:#137e73;font-size:15px;font-weight:900}.dd-panel-title span{font-size:12px;color:#7c918c;font-weight:500}.dd-panel-eye{height:124px;display:grid;place-items:center;color:#4f8f88;font-size:13px;font-weight:800}.dd-panel-eye span{display:inline-flex;align-items:center;justify-content:center;min-width:88px;height:32px;border:1px solid #bcded9;border-radius:999px;background:#f3faf8}.dd-panel-loading{cursor:wait}.dd-panel-loading .dd-panel-eye span{color:#0b8f84}.dd-panel-load-error .dd-panel-eye span{color:#c33b36;border-color:#efb9b6;background:#fff4f3}.dd-panel-content{height:124px;padding:13px 16px;line-height:1.72;overflow:auto;overscroll-behavior:contain}.dd-panel-collapsed .dd-panel-content{display:none}.dd-panel-collapsed .dd-panel-eye{display:grid}.dd-explain-card.active .dd-panel-eye,.dd-explain-card:not(.dd-panel-collapsed) .dd-panel-eye{display:none}.dd-explain-card.active .dd-panel-content,.dd-explain-card:not(.dd-panel-collapsed) .dd-panel-content{display:block}.dd-explain-card.dd-panel-no-content{cursor:default}.dd-explain-card.dd-panel-no-content .dd-panel-eye span{color:#879691;background:#f7faf9;border-color:#dbe8e6}#skillText{font-size:22px;font-weight:800}#teacherText{font-size:20px;font-weight:700}#analysisText{font-size:18px}.dd-muted{color:#879691}
.dd-keyword-neutral{color:inherit!important;font-size:inherit!important;font-weight:inherit;text-shadow:none}.dd-keyword-active.dd-keyword-blue{display:inline-block;color:#1769d2!important;font-weight:900;transform-origin:center bottom;transform:scale(1.1)}.dd-keyword-pop{animation:ddKeywordFlashThree 1.18s ease-out forwards}@keyframes ddKeywordFlashThree{0%{color:#1769d2;opacity:1;transform:scale(1);text-shadow:none}10%{opacity:.3;text-shadow:0 0 10px rgba(23,105,210,.2)}20%{opacity:1;text-shadow:0 0 12px rgba(23,105,210,.7)}30%{opacity:.3;text-shadow:0 0 10px rgba(23,105,210,.2)}40%{opacity:1;text-shadow:0 0 12px rgba(23,105,210,.7)}50%{opacity:.3;text-shadow:0 0 10px rgba(23,105,210,.2)}62%{opacity:1;text-shadow:0 0 12px rgba(23,105,210,.7)}100%{opacity:1;transform:scale(1.1);text-shadow:none}}@media(prefers-reduced-motion:reduce){.dd-keyword-pop{animation:none;transform:scale(1.1)}}
.dd-sheet-card{padding:10px 14px 14px}.dd-sheet-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:0 3px 8px}.dd-sheet-head>b{font-size:14px;white-space:nowrap}.dd-sheet-head-tools{display:flex;align-items:center;justify-content:flex-end;gap:14px;min-width:0}.dd-sheet-progress-legend{display:flex;gap:12px;font-size:11px;color:#657873;flex-wrap:wrap}.dd-sheet-jump{display:flex;align-items:center;gap:6px;white-space:nowrap;font-size:11px;color:#657873}.dd-sheet-jump input{width:72px;height:30px;border:1px solid #cbdedb;border-radius:6px;padding:0 7px;font:inherit;color:#243c38}.dd-sheet-jump button{height:30px;border:1px solid #0b8f84;border-radius:6px;background:#0b8f84;color:#fff;padding:0 10px;font-weight:800;cursor:pointer}#sheetWindowSummary{color:#0b8f84;font-weight:800}.dd-sheet-progress-legend span{display:flex;align-items:center;gap:4px}.dd-sheet-progress-legend i{width:11px;height:7px;border-radius:2px;border:1px solid #c9d9d6;background:#fff}.dd-legend-current{background:#0b8f84!important}.dd-legend-correct{background:#2fb374!important}.dd-legend-wrong{background:#ee5f5b!important}.dd-legend-mastered{background:#bff0cf!important}.dd-sheet-grid{display:grid;grid-template-columns:repeat(10,minmax(0,1fr));gap:6px;max-height:150px;overflow-y:auto;overflow-x:hidden;scrollbar-gutter:stable;padding-right:5px}.dd-sheet-btn{height:42px;border:1px solid #d3e3e0;background:#fff;border-radius:7px;position:relative;cursor:pointer;font-weight:800}.dd-sheet-btn.current{background:#078e83;color:#fff;border-color:#078e83}.dd-sheet-btn::after{display:none}.dd-sheet-btn.dd-mastery-mastered{background:#dff7e7;border-color:#80c99a;color:#196d3b}.dd-mastery-steps{position:absolute;left:6px;right:6px;bottom:5px;height:5px;display:block;border:0;border-radius:3px;background-repeat:no-repeat;background-size:100% 100%}.dd-mastery-steps i{display:none!important}.dd-sheet-number{position:relative;z-index:1}.dd-mastery-step-pulse{animation:ddPulse .45s ease}@keyframes ddPulse{50%{transform:scale(1.04)}}

.dd-modal-open{overflow:hidden}.dd-modal-mask{position:fixed;inset:0;z-index:100;background:rgba(14,39,35,.52);display:flex;align-items:center;justify-content:center;padding:clamp(18px,4vh,42px);backdrop-filter:blur(3px)}.dd-modal{width:min(920px,calc(100vw - 48px));max-height:min(820px,calc(100vh - 72px));overflow:hidden;background:#fff;border:1px solid rgba(115,166,158,.34);border-radius:18px;box-shadow:0 28px 90px rgba(9,43,38,.3);position:relative;padding:0;outline:none}.dd-modal-close{position:absolute;right:18px;top:15px;z-index:3;width:36px;height:36px;border:1px solid #d8e7e4;background:#f3f8f7;border-radius:50%;font-size:23px;line-height:32px;color:#45635e;cursor:pointer}.dd-modal-close:hover{background:#e7f5f2;color:#087e74;border-color:#96cbc4}.dd-modal h2{height:66px;margin:0;padding:0 68px 0 24px;display:flex;align-items:center;border-bottom:1px solid #dce9e7;background:linear-gradient(180deg,#fff,#f7fbfa);font-size:21px}.dd-modal-content{max-height:calc(min(820px,100vh - 72px) - 66px);overflow:auto;padding:22px 24px 26px;overscroll-behavior:contain}.dd-choice-grid,.dd-bank-choice-grid,.dd-category-choice-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.dd-bank-choice,.dd-category-choice{min-height:68px;border:1px solid #d2e4e1;background:#fff;border-radius:11px;padding:14px;text-align:left;cursor:pointer;transition:border-color .16s,background .16s,transform .16s}.dd-bank-choice:hover,.dd-category-choice:hover{border-color:#45b4a9;background:#f1f9f8;transform:translateY(-1px)}.dd-bank-choice-copy b{display:block;font-size:15px}.dd-bank-choice-copy em{display:block;margin-top:4px;color:#738783;font-size:12px;font-style:normal}.dd-choice-section-title{display:flex;align-items:center;justify-content:space-between;margin:20px 0 10px;color:#263d39}.dd-choice-section-title span{font-size:12px;color:#70837f}.dd-bank-mode-switch{border:1px solid #d6e7e4;border-radius:14px;padding:16px;background:#f7fbfa}.dd-bank-mode-switch-title{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;margin-bottom:11px}.dd-bank-mode-switch-title b{font-size:16px}.dd-bank-mode-switch-title span{font-size:12px;color:#738783}.dd-bank-mode-switch-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.dd-bank-mode-choice{min-height:76px;border:1px solid #cddfdb;background:#fff;border-radius:12px;padding:13px 15px;display:flex;align-items:center;justify-content:space-between;gap:14px;text-align:left;cursor:pointer}.dd-bank-mode-choice span b,.dd-bank-mode-choice span small{display:block}.dd-bank-mode-choice span b{font-size:16px}.dd-bank-mode-choice span small{margin-top:5px;color:#738783;line-height:1.45}.dd-bank-mode-choice em{font-style:normal;white-space:nowrap;border-radius:999px;padding:5px 10px;background:#edf6f4;color:#177e74;font-size:12px;font-weight:800}.dd-bank-mode-choice.active{border-color:#0a9c90;background:#eaf8f5;box-shadow:inset 0 0 0 1px rgba(10,156,144,.12)}.dd-bank-mode-choice.active em{background:#07978b;color:#fff}.dd-modal-intensive{width:min(980px,calc(100vw - 48px))}.dd-official-modal-content{line-height:1.8}.dd-center-toast,.dd-dual-bank-toast{position:fixed;left:50%;top:46%;transform:translate(-50%,-50%) scale(.96);z-index:200;background:rgba(21,45,40,.94);color:#fff;border-radius:10px;padding:11px 18px;opacity:0;pointer-events:none;transition:.2s}.dd-center-toast.show,.dd-dual-bank-toast.show{opacity:1;transform:translate(-50%,-50%) scale(1)}
.dd-image-preview-stage{position:fixed;inset:0;z-index:180;background:rgba(0,0,0,.78);display:flex;align-items:center;justify-content:center;padding:30px}.dd-image-preview-stage img{max-width:92vw;max-height:90vh;object-fit:contain}.dd-score-summary,.dd-complete-card,.dd-wrong-config{background:#f5faf9;border:1px solid #d6e7e4;border-radius:9px;padding:14px}.dd-score-table{width:100%;border-collapse:collapse}.dd-score-table td,.dd-score-table th{border-bottom:1px solid #e1ecea;padding:8px}.dd-complete-actions,.dd-wrong-start-actions,.dd-wrong-manage-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}.dd-loading{opacity:.65;pointer-events:none}.dd-retry-load{border:1px solid #07988c;background:#07988c;color:#fff;border-radius:8px;padding:9px 16px;cursor:pointer}
.dd-free-preview .dd-left,.dd-practice-embedded-preview .dd-left,.dd-practice-embedded-preview .dd-topbar{display:none}.dd-free-preview .dd-layout,.dd-practice-embedded-preview .dd-layout{grid-template-columns:1fr;width:100%;padding:0}.dd-practice-embedded-preview .dd-page-shell{width:100%}.dd-practice-embedded-preview .dd-question-card{box-shadow:none;border-radius:0}

@media(max-width:1500px){.dd-page-shell{width:calc(100vw - 22px)}.dd-layout{grid-template-columns:182px minmax(0,1fr);gap:11px}.dd-question-body{height:380px;grid-template-columns:minmax(0,1fr) minmax(320px,36%);padding:16px 17px 13px;column-gap:18px}.dd-control-toolbar{grid-template-columns:minmax(0,1fr) minmax(320px,36%);padding:9px 17px;column-gap:18px}.dd-question-title{font-size:20px}.dd-option{font-size:17px}.dd-operation-toolbar{gap:5px}.dd-action-outline{font-size:12px;padding:0 5px}.dd-explain-dock{padding-left:17px;padding-right:17px}.dd-nav-item{min-width:92px;padding:0 14px}}
@media(max-width:1180px){.dd-screen{min-width:1024px}.dd-page-shell{width:calc(100vw - 14px)}.dd-layout{grid-template-columns:166px minmax(0,1fr);gap:9px}.dd-question-body{height:360px;grid-template-columns:minmax(0,1fr) minmax(300px,35%);padding:14px;column-gap:14px}.dd-control-toolbar{grid-template-columns:minmax(0,1fr) minmax(300px,35%);padding:8px 14px;column-gap:14px}.dd-operation-toolbar{grid-template-columns:repeat(6,minmax(0,1fr));gap:4px}.dd-action-outline{height:36px;font-size:12px}.dd-preference-panel{bottom:78px}.dd-question-title{font-size:18px}.dd-option{font-size:16px}.dd-media-frame{height:205px}.dd-question-media img{max-height:205px}.dd-explain-dock{padding:0 14px 14px;gap:8px}.dd-explain-card{height:154px}.dd-panel-title{height:38px;font-size:14px}.dd-panel-eye,.dd-panel-content{height:116px}#skillText{font-size:20px}#teacherText{font-size:19px}#analysisText{font-size:17px}.dd-sheet-grid{max-height:142px}.dd-sheet-btn{height:40px}.dd-brand{min-width:190px}.dd-header-inner{gap:22px}.dd-nav-item{min-width:82px;padding:0 11px}.dd-sheet-progress-legend{display:none}}
@media(min-width:1900px){.dd-page-shell{width:min(1820px,calc(100vw - 46px))}.dd-layout{grid-template-columns:210px minmax(0,1fr);gap:16px}.dd-question-body{height:430px;grid-template-columns:minmax(0,1fr) minmax(400px,38%);padding:20px 24px 16px;column-gap:32px}.dd-control-toolbar{grid-template-columns:minmax(0,1fr) minmax(400px,38%);padding:11px 24px;column-gap:32px}.dd-question-title{font-size:24px}.dd-option{font-size:19px}.dd-media-frame{height:250px}.dd-question-media img{max-height:250px}.dd-explain-dock{padding-left:24px;padding-right:24px}.dd-sheet-grid{max-height:160px}}

.dd-teacher-tip-karaoke-v178 .dd-teacher-tip-token-v178{color:inherit;transition:color 80ms linear,text-shadow 80ms linear}.dd-teacher-tip-karaoke-v178 .dd-teacher-tip-token-v178.dd-teacher-tip-spoken-v178{color:#1976d2!important;text-shadow:0 0 .01px #1976d2}@media(prefers-reduced-motion:reduce){.dd-teacher-tip-karaoke-v178 .dd-teacher-tip-token-v178{transition:none}}

/* DD-PC-PRACTICE-V2.2.1.4.1: shadow-free media, aligned six-column controls, centered dialogs and trigger-only keyword animation. */


/* DD-PC-PRACTICE-V2.2.1.4.7 complete UI/data correction */
.dd-left{min-height:100%}
.dd-left>.dd-side-card:nth-child(2){flex:1;display:flex;flex-direction:column;align-items:stretch;min-height:0}
.dd-mode-btn{display:grid;grid-template-columns:26px minmax(0,1fr);gap:8px;align-items:center;height:40px;padding:0 12px;font-size:14px;line-height:1}
.dd-mode-icon{width:24px;height:24px;display:grid;place-items:center;font-family:"Microsoft YaHei UI","Segoe UI Symbol",sans-serif;font-size:15px;line-height:1;font-weight:900;color:#4b6863}
.dd-mode-btn.active .dd-mode-icon{color:#fff}
.dd-mode-text{display:block;line-height:24px;font-size:14px;font-weight:800;text-align:left}
.dd-progress-card{margin-top:0}

.dd-question-body{height:400px;display:grid;grid-template-columns:1fr;grid-template-rows:auto auto minmax(0,1fr);row-gap:8px;padding:16px 22px 14px;overflow:hidden}
.dd-question-title-row{grid-row:1;grid-column:1;margin:0;align-items:flex-start;padding-right:0}
.dd-network-status{grid-row:2;grid-column:1}
.dd-question-content-grid{grid-row:3;grid-column:1;min-width:0;min-height:0;display:grid;grid-template-columns:minmax(0,1fr) minmax(350px,38%);column-gap:clamp(20px,2vw,34px);overflow:hidden}
.dd-question-left{min-width:0;min-height:0;overflow-y:auto;overflow-x:hidden;scrollbar-gutter:stable;padding:0 12px 4px 0}
.dd-question-right{min-width:0;min-height:0;display:flex;flex-direction:column;align-items:stretch;justify-content:flex-start;gap:10px}
.dd-question-body.no-media .dd-question-content-grid{grid-template-columns:minmax(0,1fr) minmax(350px,38%)}
.dd-question-body.no-media .dd-question-right{justify-content:flex-end}
.dd-question-media{width:100%;align-items:flex-end}
.dd-media-frame{width:100%;height:230px;justify-content:flex-end}
.dd-question-media img{margin-left:auto;margin-right:0}
.dd-view-image{align-self:flex-end;margin-right:4px}
.dd-answer-pad{margin-top:auto}
.dd-answer-pad-options,.dd-operation-toolbar{width:100%}
.dd-answer-pad-btn,.dd-action-outline{box-sizing:border-box}
.dd-answer-row{font-size:18px;gap:12px;padding-top:10px;margin-top:12px}
.dd-answer-label{font-size:17px;font-weight:800}
.dd-answer-letter,.dd-right-answer,.dd-right-answer b{font-size:19px;font-weight:1000}

.dd-preference-panel{width:350px}
.dd-preference-group-title{padding-top:10px}
.dd-preference-official{display:none!important}

.dd-modal-special{width:min(1160px,calc(100vw - 48px));max-height:calc(100vh - 48px)}
.dd-modal-special .dd-modal-content{overflow:visible;max-height:none;padding:18px 22px 22px}
.dd-special-choice-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:9px}
.dd-modal-special .dd-category-choice{min-height:58px;padding:9px 11px;border-radius:9px}
.dd-modal-special .dd-bank-choice-icon{font-size:16px}
.dd-modal-special .dd-bank-choice-copy b{font-size:13px;line-height:1.3}
.dd-modal-special .dd-bank-choice-copy em{font-size:11px;margin-top:2px}
.dd-modal-chapter,.dd-modal-intensive{width:min(980px,calc(100vw - 48px))}
.dd-modal-chapter .dd-modal-content,.dd-modal-intensive .dd-modal-content{overflow:visible;max-height:none}

@media(max-width:1500px){
  .dd-question-content-grid{grid-template-columns:minmax(0,1fr) minmax(320px,36%);column-gap:18px}
  .dd-question-body.no-media .dd-question-content-grid{grid-template-columns:minmax(0,1fr) minmax(320px,36%)}
  .dd-special-choice-grid{grid-template-columns:repeat(4,minmax(0,1fr))}
}
@media(max-width:1180px){
  .dd-question-content-grid{grid-template-columns:minmax(0,1fr) minmax(300px,35%);column-gap:14px}
  .dd-question-body.no-media .dd-question-content-grid{grid-template-columns:minmax(0,1fr) minmax(300px,35%)}
  .dd-special-choice-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .dd-modal-special .dd-modal-content{overflow:auto;max-height:calc(100vh - 110px)}
}
@media(min-width:1900px){
  .dd-question-content-grid{grid-template-columns:minmax(0,1fr) minmax(400px,38%);column-gap:32px}
  .dd-question-body.no-media .dd-question-content-grid{grid-template-columns:minmax(0,1fr) minmax(400px,38%)}
}


/* DD-PC-PRACTICE-V2.2.1.4.7 focused UI closure */
.dd-navigation-card{flex:0 0 auto!important;display:flex;flex-direction:column;align-items:stretch;min-height:0}
.dd-side-title{font-size:14px;line-height:22px;margin-bottom:9px}
.dd-mode-btn{grid-template-columns:30px minmax(0,1fr);gap:9px;height:44px;padding:0 12px;font-size:15px;line-height:1;border-radius:9px}
.dd-mode-icon{width:28px;height:28px;display:grid;place-items:center;color:#4b6863}
.dd-mode-icon svg{width:22px;height:22px;display:block;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.dd-mode-btn.active .dd-mode-icon{color:#fff}
.dd-mode-text{font-size:15px;line-height:26px;font-weight:850;letter-spacing:.01em}
.dd-progress-card{margin-top:0}

.dd-preference-wrap{display:flex;align-items:center;justify-content:center}
.dd-preference-button{width:100%;height:40px;border:0;background:transparent;border-radius:0;padding:0 4px;color:#315d56;font-size:13px;font-weight:900;display:flex;align-items:center;justify-content:center;gap:5px;cursor:pointer;white-space:nowrap}
.dd-preference-button svg{width:19px;height:19px;fill:none;stroke:currentColor;stroke-width:1.65;stroke-linecap:round;stroke-linejoin:round}
.dd-preference-button:hover,.dd-preference-button[aria-expanded='true']{color:#078d82;background:transparent}
.dd-preference-button:focus-visible{outline:2px solid rgba(7,152,140,.3);outline-offset:2px;border-radius:6px}

.dd-keyword-active.dd-keyword-blue{transform:scale(1.12)}
.dd-keyword-pop{animation:ddKeywordCalmReveal 2.55s ease-in-out forwards}
@keyframes ddKeywordCalmReveal{
  0%{color:#1769d2;opacity:.76;transform:scale(1);text-shadow:none}
  14%{opacity:1;text-shadow:0 0 8px rgba(23,105,210,.36)}
  28%{opacity:.78;text-shadow:none}
  42%{opacity:1;text-shadow:0 0 9px rgba(23,105,210,.4)}
  56%{opacity:.8;text-shadow:none}
  70%{opacity:1;text-shadow:0 0 10px rgba(23,105,210,.45)}
  84%{opacity:1;transform:scale(1.04);text-shadow:none}
  100%{opacity:1;transform:scale(1.12);text-shadow:none}
}
@media(prefers-reduced-motion:reduce){.dd-keyword-pop{animation:none;transform:scale(1.12)}}

.dd-image-preview-open{overflow:hidden}
.dd-image-preview-overlay{position:fixed;inset:0;z-index:220;background:rgba(8,14,13,.84);display:flex;align-items:center;justify-content:center;padding:34px}
.dd-image-preview-overlay img{display:block;max-width:94vw;max-height:90vh;width:auto;height:auto;object-fit:contain;background:transparent;border:0;box-shadow:none}
.dd-image-preview-close{position:fixed;right:28px;top:22px;width:42px;height:42px;border:1px solid rgba(255,255,255,.42);border-radius:50%;background:rgba(0,0,0,.28);color:#fff;font-size:29px;line-height:38px;cursor:pointer;z-index:221}
.dd-image-preview-close:hover{background:rgba(0,0,0,.55);border-color:#fff}

.dd-modal-special .dd-category-choice{display:flex;align-items:center;gap:10px;min-width:0}
.dd-modal-special .dd-bank-choice-icon{flex:0 0 24px;width:24px;height:24px;display:grid;place-items:center;font-size:17px;line-height:1}
.dd-modal-special .dd-bank-choice-copy{min-width:0;flex:1;display:flex;align-items:center;gap:8px;white-space:nowrap}
.dd-modal-special .dd-bank-choice-copy b{display:block;min-width:0;font-size:13px;line-height:1.25;white-space:nowrap;overflow:visible}
.dd-modal-special .dd-bank-choice-copy em{display:block;margin:0 0 0 auto;font-size:11px;line-height:1.2;white-space:nowrap;color:#70837f}
.dd-modal-special .dd-category-memory-badge{margin-left:4px;white-space:nowrap}

@media(max-width:1500px){
  .dd-mode-btn{height:42px;font-size:14px}.dd-mode-icon svg{width:21px;height:21px}.dd-mode-text{font-size:14px}
}
@media(max-width:1180px){
  .dd-preference-button{height:36px;font-size:12px}.dd-preference-button svg{width:18px;height:18px}
  .dd-modal-special .dd-bank-choice-copy{gap:5px}.dd-modal-special .dd-bank-choice-copy b{font-size:12px}.dd-modal-special .dd-bank-choice-copy em{font-size:10px}
}


/* DD-PC-PRACTICE-V2.2.1.4.7: formal routes only, stable sidebar, three-column special dialog, dynamic province chapters. */
.dd-layout{align-items:stretch!important}
.dd-left{height:auto!important;min-height:100%!important;align-self:stretch!important;display:flex!important;flex-direction:column!important}
.dd-navigation-card{flex:1 1 auto!important;height:auto!important;min-height:0!important}
.dd-progress-card{margin-top:auto!important}
.dd-modal-special{width:min(980px,calc(100vw - 48px))!important}
.dd-special-choice-grid{grid-template-columns:repeat(3,minmax(0,1fr))!important;gap:10px!important}
.dd-modal-special .dd-category-choice{min-height:62px!important;padding:10px 12px!important;display:flex!important;align-items:center!important;gap:10px!important}
.dd-modal-special .dd-bank-choice-icon{flex:0 0 26px!important;width:26px!important;height:26px!important;display:grid!important;place-items:center!important}
.dd-modal-special .dd-bank-choice-copy{min-width:0!important;flex:1!important;display:flex!important;align-items:center!important;gap:8px!important;white-space:nowrap!important}
.dd-modal-special .dd-bank-choice-copy b{min-width:0!important;white-space:nowrap!important;overflow:visible!important}
.dd-modal-special .dd-bank-choice-copy em{margin-left:auto!important;white-space:nowrap!important}
@media(max-width:900px){.dd-special-choice-grid{grid-template-columns:repeat(2,minmax(0,1fr))!important}}
@media(max-width:620px){.dd-special-choice-grid{grid-template-columns:1fr!important}}


/* DD-PC-PRACTICE-V2.2.1.4.7 — 后台技巧HTML安全渲染 */
#skillText.skill-content .blue,
#skillText .blue { color:#135ee8; font-weight:700; }
#skillText.skill-content .red,
#skillText .red { color:#d92d20; font-weight:700; }
#skillText.show-keywords .blue,
#skillText.show-keywords .red {
  display:inline-block;
  animation:ddjkKeywordShow 1.2s ease-out both;
}
@keyframes ddjkKeywordShow {
  0% { opacity:0; transform:scale(1); }
  55% { opacity:1; transform:scale(1); }
  80% { transform:scale(1.15); }
  100% { opacity:1; transform:scale(1); }
}


/* DD-PC-PRACTICE-V2.2.1.4.7 — 左右列底线稳定对齐 */
.dd-layout{align-items:stretch!important}
.dd-main{height:auto;align-self:stretch}
.dd-left{align-self:stretch!important;display:flex!important;flex-direction:column!important}
.dd-navigation-card{flex:1 1 auto!important;min-height:0!important}
.dd-progress-card{flex:0 0 auto!important;margin-top:auto!important}


/* DD-WEB-PRACTICE-V2.3.0.2 — 标准版/优化版独立入口 */
.dd-edition-switch{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-top:8px}
.dd-edition-link{height:32px;border:1px solid #c8dfdb;border-radius:7px;background:#fff;color:#315d56;text-decoration:none;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:850;white-space:nowrap}
.dd-edition-link:hover{border-color:#64bfb5;background:#f3fbf9;color:#087f75}
.dd-edition-link.active{border-color:#07988c;background:#07978b;color:#fff;box-shadow:0 3px 8px rgba(7,151,139,.16)}
html[data-dd-fixed-entry="optimized"] .dd-mode-label{background:#fff5de;border-color:#f2d69b;color:#986700}
html[data-dd-fixed-entry="optimized"] .dd-bank-mode-badge{background:#fff1d6;color:#9c6800}
html[data-dd-fixed-entry="original"] .dd-bank-mode-badge{background:#e2f5f1;color:#087f75}
.dd-question-media{cursor:zoom-in}
.dd-view-image{display:none!important}
.dd-media-frame{box-shadow:none!important;filter:none!important}
.dd-media-frame img{box-shadow:none!important;filter:none!important}


/* DD-WEB-PRACTICE-V2.3.0.2 — 完整导航、左右对齐、未答题黑色、技巧HTML与答案提示 */
.dd-layout{grid-template-columns:200px minmax(0,1fr)!important;align-items:stretch!important}
.dd-left{width:200px!important;min-width:200px!important;gap:10px!important}
.dd-left>.dd-side-card{width:100%!important;box-sizing:border-box!important}
.dd-side-title{height:22px!important;line-height:22px!important;margin-bottom:8px!important;font-size:13px!important}
.dd-navigation-card{display:flex!important;flex-direction:column!important;gap:0!important;padding:10px!important}
.dd-navigation-card .dd-mode-btn{width:100%!important;min-height:42px!important;height:42px!important;padding:0 10px!important;margin:0!important;grid-template-columns:30px minmax(0,1fr)!important;gap:8px!important}
.dd-navigation-card .dd-mode-icon{width:24px!important;height:24px!important;display:grid!important;place-items:center!important}
.dd-navigation-card .dd-mode-icon svg{width:21px!important;height:21px!important}
.dd-navigation-card .dd-mode-text{font-size:14px!important;line-height:1.2!important;text-align:left!important}
.dd-progress-card{display:flex!important;flex-direction:column!important;justify-content:center!important;box-sizing:border-box!important}
.dd-main{align-self:stretch!important;min-width:0!important}
.dd-sheet-card{box-sizing:border-box!important}
.dd-edition-link,.dd-bank-mode-choice{touch-action:manipulation}
.dd-bank-mode-choice{text-decoration:none!important;color:inherit}

/* 未答题：字母和选项正文始终为黑色，不提前泄露判题颜色。 */
.dd-option:not(.dd-option-evaluated) .dd-letter,
.dd-option:not(.dd-option-evaluated) .dd-option-text,
.dd-option:not(.dd-option-evaluated) .dd-option-content,
.dd-option.selected:not(.dd-option-evaluated) .dd-letter,
.dd-option.selected:not(.dd-option-evaluated) .dd-option-text,
.dd-option.selected:not(.dd-option-evaluated) .dd-option-content{color:#111!important}
.dd-option:not(.dd-option-evaluated) .dd-keyword-neutral{color:inherit!important}

/* 错题答案提示整段红色，正确答案提示整段绿色。 */
.dd-answer-row{align-items:flex-start!important;gap:14px!important;font-size:20px!important;line-height:1.55!important}
.dd-answer-row.dd-answer-wrong .dd-answer-label,
.dd-answer-row.dd-answer-wrong .dd-answer-letters,
.dd-answer-row.dd-answer-wrong .dd-answer-letter,
.dd-answer-row.dd-answer-wrong .wrong-answer{color:#d92d20!important;font-size:20px!important;font-weight:900!important}
.dd-right-answer,.dd-right-answer b{color:#159447!important;font-size:20px!important;font-weight:900!important}

/* 技巧只安全呈现后台 span.blue / span.red；两类关键词统一为正式蓝色。 */
#skillText .blue,#skillText .red,
#skillText.skill-content .blue,#skillText.skill-content .red{color:#135ee8!important;font-weight:700!important;background:transparent!important;text-shadow:none!important}
#skillText.show-keywords .blue,#skillText.show-keywords .red{display:inline-block;transform-origin:center bottom;animation:ddSkillKeywordRevealV2302 1.65s cubic-bezier(.22,.72,.28,1) both!important}
@keyframes ddSkillKeywordRevealV2302{0%{opacity:0;transform:scale(1)}62%{opacity:1;transform:scale(1)}82%{opacity:1;transform:scale(1.06)}100%{opacity:1;transform:scale(1)}}
.dd-keyword-pop{animation:ddKeywordCalmRevealV2302 1.65s cubic-bezier(.22,.72,.28,1) both!important}
@keyframes ddKeywordCalmRevealV2302{0%{opacity:0;transform:scale(1);text-shadow:none}72%{opacity:1;transform:scale(1);text-shadow:none}88%{opacity:1;transform:scale(1.06);text-shadow:none}100%{opacity:1;transform:scale(1);text-shadow:none}}
@media(prefers-reduced-motion:reduce){#skillText.show-keywords .blue,#skillText.show-keywords .red,.dd-keyword-pop{animation:none!important;transform:none!important}}

@media(max-width:1500px){.dd-layout{grid-template-columns:182px minmax(0,1fr)!important}.dd-left{width:182px!important;min-width:182px!important}}
@media(max-width:1180px){.dd-layout{grid-template-columns:166px minmax(0,1fr)!important}.dd-left{width:166px!important;min-width:166px!important}.dd-navigation-card .dd-mode-btn{padding:0 7px!important;grid-template-columns:27px minmax(0,1fr)!important;gap:6px!important}.dd-navigation-card .dd-mode-text{font-size:13px!important}}


/* DD-WEB-PRACTICE-V2.3.0.2 — 现代学习导航与轻量版本切换 */
.dd-left{gap:12px!important}
.dd-left>.dd-side-card{border:1px solid rgba(31,109,99,.13)!important;border-radius:16px!important;background:linear-gradient(180deg,#fff 0%,#fbfefd 100%)!important;box-shadow:0 9px 24px rgba(20,81,72,.065)!important}
.dd-side-title{position:relative!important;display:flex!important;align-items:center!important;padding-left:12px!important;color:#173d38!important;font-size:14px!important;font-weight:900!important;letter-spacing:.01em!important}
.dd-side-title:before{content:"";position:absolute;left:0;width:4px;height:16px;border-radius:99px;background:linear-gradient(180deg,#12a99c,#087f75)}
.dd-bank-card{min-height:58px!important;padding:10px 11px!important;border:1px solid transparent!important;border-radius:13px!important;background:linear-gradient(135deg,#effaf7 0%,#f7fcfb 100%)!important;transition:border-color .18s ease,box-shadow .18s ease,transform .18s ease!important}
.dd-bank-card:hover{border-color:#9ed7d0!important;box-shadow:0 7px 16px rgba(11,132,120,.1)!important;transform:translateY(-1px)}
.dd-bank-icon{width:32px!important;height:32px!important;border-radius:10px!important;background:#fff!important;display:grid!important;place-items:center!important;box-shadow:0 3px 10px rgba(19,100,91,.09)!important}
.dd-edition-switch{padding:4px!important;gap:4px!important;border:1px solid #d8ebe7!important;border-radius:12px!important;background:#edf7f5!important}
.dd-edition-link{height:35px!important;border:0!important;border-radius:9px!important;background:transparent!important;color:#3b625d!important;font-size:13px!important;box-shadow:none!important;transition:background .16s ease,color .16s ease,box-shadow .16s ease!important}
.dd-edition-link:hover{background:rgba(255,255,255,.72)!important;color:#087f75!important}
.dd-edition-link.active{background:#fff!important;color:#087f75!important;box-shadow:0 4px 12px rgba(18,97,87,.12)!important}
.dd-navigation-card{padding:12px 10px!important;gap:5px!important;background:linear-gradient(180deg,#fff 0%,#f9fcfb 100%)!important}
.dd-navigation-card .dd-side-title{margin:0 2px 5px!important}
.dd-navigation-card .dd-mode-btn{position:relative!important;min-height:47px!important;height:47px!important;padding:0 34px 0 8px!important;border:1px solid transparent!important;border-radius:12px!important;background:transparent!important;color:#315550!important;grid-template-columns:34px minmax(0,1fr)!important;gap:9px!important;transition:background .17s ease,border-color .17s ease,color .17s ease,box-shadow .17s ease,transform .17s ease!important}
.dd-navigation-card .dd-mode-btn:after{content:"›";position:absolute;right:12px;top:50%;transform:translateY(-52%);font-size:21px;font-weight:500;color:#9ab2ae;transition:transform .17s ease,color .17s ease}
.dd-navigation-card .dd-mode-btn:hover:not(:disabled){background:#eff9f7!important;border-color:#d4ebe7!important;color:#087f75!important;transform:translateX(2px)}
.dd-navigation-card .dd-mode-btn:hover:not(:disabled):after{color:#2d9a90;transform:translate(2px,-52%)}
.dd-navigation-card .dd-mode-icon{width:32px!important;height:32px!important;border-radius:10px!important;background:#edf6f4!important;color:#53736e!important;transition:background .17s ease,color .17s ease,transform .17s ease!important}
.dd-navigation-card .dd-mode-icon svg{width:19px!important;height:19px!important;stroke-width:1.9!important}
.dd-navigation-card .dd-mode-text{font-size:14px!important;font-weight:850!important;letter-spacing:.01em!important}
.dd-navigation-card .dd-mode-btn.active{border-color:#07988c!important;background:linear-gradient(135deg,#0aa397 0%,#087f75 100%)!important;color:#fff!important;box-shadow:0 8px 18px rgba(8,143,132,.22)!important;transform:none!important}
.dd-navigation-card .dd-mode-btn.active:after{color:rgba(255,255,255,.82)!important}
.dd-navigation-card .dd-mode-btn.active .dd-mode-icon{background:rgba(255,255,255,.18)!important;color:#fff!important;transform:scale(1.02)}
.dd-navigation-card .dd-mode-btn.dd-mode-unavailable{display:none!important}
.dd-navigation-card .dd-mode-btn.dd-vip-locked:not(.active){opacity:.72!important}
.dd-progress-card{padding:13px!important;background:linear-gradient(180deg,#fff 0%,#f7fbfa 100%)!important}
.dd-outline-wide{border-radius:10px!important;background:#fff!important;transition:border-color .16s ease,background .16s ease,color .16s ease!important}
.dd-outline-wide:hover{border-color:#72c3ba!important;background:#f0faf8!important;color:#087f75!important}

/* 后台标注同步：只渲染后台返回的 blue/red，不识别、不猜测、不改写关键词。 */
#skillText.show-keywords span.blue,#skillText.show-keywords span.red{color:#135ee8!important;font-weight:700!important}

@media(max-width:1500px){
  .dd-navigation-card .dd-mode-btn{min-height:44px!important;height:44px!important;grid-template-columns:31px minmax(0,1fr)!important;padding-left:7px!important}
  .dd-navigation-card .dd-mode-icon{width:29px!important;height:29px!important}
}
@media(max-width:1180px){
  .dd-left>.dd-side-card{border-radius:13px!important}
  .dd-navigation-card{padding:9px 7px!important;gap:3px!important}
  .dd-navigation-card .dd-mode-btn{min-height:42px!important;height:42px!important;padding-right:26px!important;grid-template-columns:28px minmax(0,1fr)!important;gap:6px!important;border-radius:10px!important}
  .dd-navigation-card .dd-mode-btn:after{right:8px!important}
  .dd-navigation-card .dd-mode-icon{width:27px!important;height:27px!important;border-radius:8px!important}
  .dd-navigation-card .dd-mode-text{font-size:13px!important}
}

/* V2.3.0.5：版本切换为原生链接，不设置任何阻塞态或禁用态。 */

/* ===== DD-WEB-PRACTICE-V2.3.0.6 独立运行核心 / 虚拟答题卡 ===== */
.dd-sheet-window-nav{height:42px;border:1px dashed #9fc9c3;background:#f2fbf9;border-radius:7px;color:#087f75;font-weight:800;cursor:pointer;padding:0 8px}
.dd-sheet-window-nav:hover{background:#e4f7f3}
.dd-sheet-btn.answered-correct:not(.current){border-color:#8dd8af;background:#f3fff7}
.dd-sheet-btn.answered-wrong:not(.current){border-color:#f4aaa6;background:#fff7f6}
.dd-sheet-btn.answered-correct:not(.current) .dd-sheet-number{color:#16834b}
.dd-sheet-btn.answered-wrong:not(.current) .dd-sheet-number{color:#c83c37}
.dd-feedback.correct{color:#12864e;font-weight:800}.dd-feedback.wrong{color:#d92d20;font-weight:800}
.dd-practice-toast{position:fixed;left:50%;bottom:42px;z-index:2147483000;transform:translate(-50%,18px);opacity:0;background:rgba(17,45,45,.94);color:#fff;padding:10px 18px;border-radius:10px;font:700 14px/1.4 system-ui;transition:.2s ease;pointer-events:none}.dd-practice-toast.show{transform:translate(-50%,0);opacity:1}
.dd-session-overlay{position:fixed;inset:0;z-index:2147483646;background:rgba(10,28,31,.7);backdrop-filter:blur(4px)}
.dd-session-dialog{position:fixed;left:50%;top:50%;transform:translate(-50%,-50%);z-index:2147483647;background:#fff;border-radius:18px;padding:26px 34px;box-shadow:0 20px 70px rgba(0,0,0,.32);font:500 16px/1.65 system-ui;color:#17383b;text-align:center;min-width:360px}
.dd-session-dialog strong{display:block;font-size:21px;margin-bottom:8px}.dd-session-dialog p{color:#60777a;margin:0 0 18px}.dd-session-dialog button{border:0;border-radius:10px;padding:10px 28px;background:#0d988d;color:#fff;font:700 15px system-ui;cursor:pointer}
.dd-practice-loading-v2306 .dd-question-title{opacity:.65}.dd-practice-loading-v2306 .dd-question-card{cursor:progress}
.dd-runtime-booting .dd-question-title{min-height:1.6em}
.dd-keyword-once{display:inline-block;color:#135ee8!important;font-weight:700!important;animation:ddKeywordOnceV2306 .62s ease-out 1 both}
@keyframes ddKeywordOnceV2306{0%{opacity:.2;transform:scale(.96)}55%{opacity:1;transform:scale(1.12)}100%{opacity:1;transform:scale(1)}}
#skillText .blue,#skillText .red,#skillText .dd-keyword,#skillText .dd-keyword-red,#skillText .dd-keyword-blue{color:#135ee8!important;font-weight:700!important}
.dd-sheet-grid{contain:layout paint style;content-visibility:auto}
.dd-sheet-btn,.dd-sheet-window-nav{contain:layout paint style}
@media(max-width:1180px){.dd-sheet-window-nav{height:40px;font-size:11px}}

/* ===== V2.3.1.8 formal DD execution contract: V2.3.0.6 visual base + current DD contract ===== */
.dd-bank-icon svg{width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.dd-action-outline svg,.dd-preference-button svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex:0 0 auto}
.dd-action-outline{display:inline-flex;align-items:center;justify-content:center;gap:5px}
.dd-explain-optimized{grid-template-columns:repeat(2,minmax(0,1fr))}
.dd-explain-standard{grid-template-columns:repeat(2,minmax(0,1fr))}
.dd-explain-card.dd-panel-no-content .dd-panel-eye span{color:#8a9b97;background:#f7faf9;border-color:#dce7e5}

.dd-sheet-grid.dd-sheet-virtualized{display:block;position:relative;overflow-y:auto;overflow-x:hidden;max-height:230px;padding:0 5px 0 0;contain:strict;scroll-behavior:auto;overscroll-behavior:contain;scrollbar-gutter:stable}
.dd-sheet-virtual-canvas{position:relative;width:100%;min-height:52px}
.dd-sheet-virtual-window{position:absolute;left:0;right:0;top:0;display:grid;grid-template-columns:repeat(var(--dd-sheet-columns,10),minmax(0,1fr));gap:6px;will-change:transform;contain:layout paint style}
.dd-sheet-virtual-window .dd-sheet-btn{height:46px;min-width:0;contain:layout paint style}

.dd-dialog-open{overflow:hidden}
.dd-dialog-mask{position:fixed;inset:0;z-index:2100;display:flex;align-items:center;justify-content:center;padding:24px;background:rgba(14,39,35,.52);backdrop-filter:blur(3px)}
.dd-dialog{width:min(760px,calc(100vw - 48px));max-height:min(760px,calc(100vh - 48px));display:flex;flex-direction:column;overflow:hidden;background:#fff;border:1px solid rgba(115,166,158,.34);border-radius:18px;box-shadow:0 28px 90px rgba(9,43,38,.3);outline:none}
.dd-dialog-head{height:64px;flex:0 0 64px;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:0 18px 0 24px;border-bottom:1px solid #dce9e7;background:linear-gradient(180deg,#fff,#f7fbfa)}
.dd-dialog-head h2{margin:0;font-size:20px;color:#1d3c37;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.dd-dialog-close{width:36px;height:36px;flex:0 0 36px;border:1px solid #d8e7e4;background:#f3f8f7;border-radius:50%;font-size:23px;line-height:32px;color:#45635e;cursor:pointer}
.dd-dialog-close:hover{background:#e7f5f2;color:#087e74;border-color:#96cbc4}
.dd-dialog-content{min-height:0;overflow:auto;padding:20px 22px 24px;overscroll-behavior:contain}
.dd-dialog-random{width:min(620px,calc(100vw - 48px))}
.dd-dialog-region{width:min(760px,calc(100vw - 48px))}
.dd-dialog-chapter,.dd-dialog-intensive{width:min(900px,calc(100vw - 48px))}
.dd-dialog-special{width:min(1040px,calc(100vw - 48px))}
.dd-dialog-bank{width:min(920px,calc(100vw - 48px))}
.dd-dialog-progress,.dd-dialog-official{width:min(760px,calc(100vw - 48px))}
.dd-dialog-official .dd-dialog-content{line-height:1.8;color:#283e3a}
.dd-official-dialog-actions{display:flex;justify-content:flex-end;margin-bottom:12px}
.dd-official-dialog-actions button{height:38px;border:1px solid #0a9085;border-radius:9px;background:#fff;color:#087e74;padding:0 16px;font-weight:800;cursor:pointer}

.dd-bank-tabs{display:flex;align-items:center;gap:8px;overflow-x:auto;white-space:nowrap;border-bottom:1px solid #dce9e7;padding:0 0 12px;margin-bottom:16px;scrollbar-width:thin}
.dd-bank-tabs button{flex:0 0 auto;height:38px;border:1px solid #c9dfdb;background:#fff;color:#315d56;border-radius:999px;padding:0 20px;font-weight:900;cursor:pointer}
.dd-bank-tabs button.active{background:#078f84;border-color:#078f84;color:#fff}
.dd-choice-grid,.dd-category-choice-grid,.dd-region-choice-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.dd-dialog-special .dd-category-choice-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}
.dd-bank-choice,.dd-category-choice{min-height:68px;display:flex;align-items:center;gap:11px;min-width:0;border:1px solid #d2e4e1;background:#fff;border-radius:11px;padding:12px 13px;text-align:left;cursor:pointer;transition:border-color .16s,background .16s,transform .16s}
.dd-bank-choice:hover,.dd-category-choice:hover{border-color:#45b4a9;background:#f1f9f8;transform:translateY(-1px)}
.dd-bank-choice-icon{width:32px;height:32px;flex:0 0 32px;display:grid;place-items:center;color:#078f84}
.dd-bank-choice-icon svg{width:27px;height:27px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.dd-bank-choice-copy{min-width:0;flex:1}
.dd-bank-choice-copy b{display:block;font-size:14px;line-height:1.35;white-space:normal;overflow-wrap:anywhere}
.dd-bank-choice-copy em{display:block;min-height:15px;margin-top:4px;color:#0a8f84;font-size:11px;font-style:normal;font-weight:800}
.dd-bank-choice-copy em:empty{display:none}
.dd-category-order{width:26px;height:26px;flex:0 0 26px;display:grid;place-items:center;border-radius:8px;background:#edf7f5;color:#087f75;font-size:12px;font-weight:900}
.dd-dialog-chapter .dd-category-order,.dd-dialog-intensive .dd-category-order{display:none}
.dd-random-config{display:grid;gap:20px;text-align:center;padding:12px 6px}
.dd-random-copy b{font-size:19px}.dd-random-copy p{margin:9px 0 0;color:#657a75;line-height:1.7}
.dd-random-actions{display:flex;justify-content:center;gap:12px;flex-wrap:wrap}
.dd-random-actions button{height:42px;border:1px solid #0a9085;border-radius:9px;background:#fff;color:#087e74;padding:0 20px;font-weight:900;cursor:pointer}
.dd-random-actions button.primary{background:#078f84;color:#fff}
.dd-empty-choice{padding:36px 18px;text-align:center;color:#70837f}
.dd-score-summary p{margin:0 0 14px;color:#526c67}.dd-score-table{width:100%;border-collapse:collapse}.dd-score-table td{padding:9px 10px;border-bottom:1px solid #e4eeec}

@media(max-width:1180px){
  .dd-sheet-grid.dd-sheet-virtualized{max-height:196px}
  .dd-dialog-special .dd-category-choice-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(max-width:820px){
  .dd-dialog-mask{padding:12px}
  .dd-dialog{width:calc(100vw - 24px);max-height:calc(100vh - 24px)}
  .dd-choice-grid,.dd-category-choice-grid,.dd-region-choice-grid,.dd-dialog-special .dd-category-choice-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:560px){
  .dd-choice-grid,.dd-category-choice-grid,.dd-region-choice-grid,.dd-dialog-special .dd-category-choice-grid{grid-template-columns:1fr}
  .dd-explain-optimized,.dd-explain-standard{grid-template-columns:1fr}
  .dd-sheet-virtual-window{gap:4px}.dd-sheet-virtual-window .dd-sheet-btn{height:44px}
}

/* ===== V2.3.1.8 production browser acceptance fixes ===== */
/* Virtualized rows are absolutely positioned. Give the viewport a real height so
   the default screen always shows several rows instead of only the header. */
.dd-sheet-grid.dd-sheet-virtualized{
  height:156px;
  min-height:156px;
  max-height:230px;
  content-visibility:visible;
}

/* Short desktop screens keep the stable layout, but compact vertical whitespace
   enough to expose the answer grid without changing the question workflow. */
@media (max-height:820px) and (min-width:1024px){
  .dd-page-shell{padding-bottom:10px}
  .dd-layout{gap:8px}
  .dd-main{gap:8px}
  .dd-question-head{height:36px}
  .dd-question-body{height:286px!important;padding-top:12px!important;padding-bottom:10px!important}
  .dd-question-title{margin-bottom:9px!important;line-height:1.42!important}
  .dd-option{min-height:40px!important;margin-bottom:5px!important}
  .dd-media-frame{height:170px!important}
  .dd-question-media img{max-height:170px!important}
  .dd-control-toolbar{padding-top:6px!important;padding-bottom:6px!important}
  .dd-explain-dock{margin-top:7px!important;padding-bottom:10px!important}
  .dd-explain-card{height:128px!important}
  .dd-panel-title{height:36px!important}
  .dd-panel-eye,.dd-panel-content{height:92px!important}
  .dd-panel-content{padding-top:9px!important;padding-bottom:9px!important}
  .dd-sheet-card{padding-top:8px!important;padding-bottom:10px!important}
  .dd-sheet-head{padding-bottom:6px!important}
  .dd-sheet-grid.dd-sheet-virtualized{height:132px;min-height:132px;max-height:132px}
}

@media (max-width:1180px){
  .dd-sheet-grid.dd-sheet-virtualized{height:144px;min-height:144px;max-height:196px}
}

/* ===== V2.3.1.8 DD正式入口合同驱动 ===== */
.dd-practice-entry-list{display:flex;flex-direction:column;gap:4px;min-height:0;max-height:520px;overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin}
.dd-navigation-contract-loading,.dd-navigation-contract-error{padding:18px 12px;border-radius:12px;background:#f4faf8;color:#5c7770;font-size:13px;line-height:1.7;text-align:center}
.dd-navigation-contract-error{background:#fff4f2;color:#b43a30}
.dd-mode-btn[hidden]{display:none!important}
.dd-mode-btn .dd-mode-subtitle{display:none}
.dd-mode-btn.dd-route-entry .dd-mode-text::after{content:"正式路线";display:inline-flex;margin-left:6px;padding:1px 5px;border-radius:8px;background:#fff4d8;color:#9a6800;font-size:9px;font-weight:700;vertical-align:middle}
.dd-mode-btn.dd-region-entry .dd-mode-text::after{content:"地区";display:inline-flex;margin-left:6px;padding:1px 5px;border-radius:8px;background:#eaf7f4;color:#087e72;font-size:9px;font-weight:700;vertical-align:middle}

/* V2.3.1.8：优化版工具栏固定为七项同一行，不把“下一题”挤到第二行。 */
.dd-entry-optimized .dd-control-toolbar{grid-template-columns:minmax(0,1fr) minmax(500px,48%)}
.dd-entry-optimized .dd-operation-toolbar{grid-template-columns:repeat(7,minmax(0,1fr))}
@media(max-width:1180px){.dd-entry-optimized .dd-control-toolbar{grid-template-columns:minmax(0,1fr) minmax(480px,52%)}}

/* V2.3.2.0 region selection */
.dd-region-choice.selected{outline:3px solid rgba(19,94,232,.22);border-color:#135ee8}.dd-region-choice.selected .dd-bank-choice-copy b{color:#135ee8}