/* ---------- 基础与主题（与刷题脚本 4.33.2 的五种护眼配色一致） ---------- */
:root{--page:#f3f5f7;--card:#fff;--ink:#263449;--border:#e0e6ee;--muted:#78889b;--blue:#3085ef;--font:18px;--line:1.9;--width:1200px;--bar-h:62px;--safe-b:env(safe-area-inset-bottom,0px)}
body[data-theme=green]{--page:#e8f0e5;--card:#f2f7ee;--ink:#344932;--border:#cfddc9}
body[data-theme=paper]{--page:#eee8da;--card:#faf5e8;--ink:#514733;--border:#ddd3be}
body[data-theme=gray]{--page:#e6ebef;--card:#f0f3f5;--ink:#344858;--border:#ccd6df}
body[data-theme=night]{--page:#20252c;--card:#2a313b;--ink:#d8e0e9;--border:#46515e;--muted:#a1b1c3}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{margin:0;background:var(--page);color:var(--ink);font:14px/1.7 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}
button,input,select,textarea{font:inherit;color:inherit}
button,.file-button{cursor:pointer;border:1px solid var(--border);background:var(--card);color:var(--ink);border-radius:7px;padding:7px 13px;line-height:1.5;transition:background .15s;touch-action:manipulation}
button:hover,.file-button:hover{background:#eaf2fe;color:#2876cd}
button:disabled{opacity:.5;cursor:default}
button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:2px solid var(--blue);outline-offset:2px}
.primary{background:var(--blue);color:#fff;border-color:var(--blue)}
.primary:hover{background:#2272d3;color:#fff}
[hidden]{display:none!important}
header{height:64px;padding:0 max(24px,calc((100vw - 1200px)/2));padding-top:env(safe-area-inset-top,0px);display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border);background:var(--card)}
.brand{font-size:24px;font-weight:750;text-decoration:none;color:var(--blue);letter-spacing:2px}
.brand span{font-size:14px;font-weight:400;letter-spacing:0;margin-left:10px;color:var(--ink)}
#account{display:flex;gap:10px;align-items:center}
main{max-width:1248px;padding:28px 24px 80px;margin:auto}
h1{font-size:27px;line-height:1.4;margin:5px 0 16px;font-weight:650}
.eyebrow{font:10px/1.6 ui-monospace,monospace;letter-spacing:2.5px;color:var(--muted)}
footer{text-align:center;padding:20px;color:#94a1b3;font-size:11px}

/* ---------- 目录页 ---------- */
.page-top{display:flex;align-items:center;justify-content:space-between;gap:12px}
.actions{display:flex;gap:8px;flex-wrap:wrap}
nav{display:flex;gap:6px;border-bottom:1px solid var(--border);margin:6px 0 20px}
nav button{border:0;border-radius:0;padding:12px 24px;background:none;color:var(--muted);font-size:16px}
nav button.active{color:var(--blue);border-bottom:3px solid var(--blue);font-weight:600}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.stat{padding:16px 20px;background:var(--card);border:1px solid var(--border);border-radius:11px}
.stat strong{font:600 28px/1.3 ui-sans-serif,sans-serif;display:block;margin-top:8px}
.stat span{color:var(--muted);font-size:12px}
.stat:nth-child(2) strong{color:#d37643}.stat:nth-child(3) strong{color:var(--blue)}.stat:nth-child(4) strong{color:#349972}
.notice{font-size:12px;color:var(--muted);margin:12px 0 22px}
.filters{display:flex;gap:12px;align-items:end;flex-wrap:wrap;background:var(--card);border:1px solid var(--border);border-radius:11px;padding:18px;margin-bottom:20px}
label{display:flex;flex-direction:column;gap:5px;font-size:12px;color:var(--muted)}
select,input,textarea{background:var(--card);color:var(--ink);border:1px solid var(--border);border-radius:6px;padding:8px;max-width:100%}
select{max-width:230px}
.filters .check{flex-direction:row;align-items:center;align-self:center;color:var(--ink)}
.filters>.primary{margin-left:auto}
.empty{padding:65px 20px;text-align:center;color:var(--muted)}
#resume-card{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;background:#eef5ff;border:1px solid #bcd6fa;border-radius:11px;padding:14px 18px;margin:4px 0 18px;color:#24466f}
#resume-card strong{display:block;font-size:15px}#resume-card span{font-size:13px;opacity:.85}
.resume-actions{display:flex;gap:8px}
body[data-theme=night] #resume-card{background:#2c3a4d;border-color:#46607f;color:#dce7f5}

/* ---------- 登录 ---------- */
.login-card{max-width:460px;margin:8vh auto;padding:36px;background:var(--card);border:1px solid var(--border);border-radius:15px}
.login-card h1{font-size:26px}.login-card p{color:var(--muted)}
.login-card form{display:grid;gap:18px;margin-top:30px}
.login-card input{width:100%;font-size:16px}
#login-error{color:#c45145}

/* ---------- 做题页：整体 ---------- */
body.practicing #site-header,body.practicing footer{display:none}
body.practicing main{max-width:calc(var(--width) + 48px);padding:6px 24px calc(96px + var(--safe-b))}
body.practicing{scroll-padding-bottom:calc(110px + var(--safe-b))}
.bg-crumb{font-size:11px;line-height:1.35;color:var(--ink);opacity:.85;padding:2px 0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.btn{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--border);background:var(--card);color:var(--ink);border-radius:7px;font-size:13px;padding:4px 12px;line-height:22px;min-height:32px;white-space:nowrap}
.btn:hover{background:#eef5ff;border-color:#94bff5;color:var(--blue)}
.btn.active{background:var(--blue);border-color:var(--blue);color:#fff}
.btn.on{color:#c27a07;border-color:#efc77a}
.bg-tools{display:flex;align-items:center;gap:8px;flex-wrap:nowrap;white-space:nowrap;overflow-x:auto;overscroll-behavior-x:contain;scrollbar-width:thin;padding:7px 0 10px;margin-bottom:6px}
.bg-tools>*{flex:0 0 auto}
.bg-tool-question{font-size:13px;color:var(--ink);padding:0 6px}
.bg-return{margin-left:auto!important}
#bg-compact-card{position:relative;font-size:13px}
#bg-compact-card>summary{cursor:pointer;background:var(--card);border:1px solid var(--border);border-radius:7px;padding:4px 10px;line-height:22px;min-height:32px;display:flex;align-items:center;list-style:none;white-space:nowrap}
#bg-compact-card>summary::-webkit-details-marker{display:none}
#card-popup{position:fixed;z-index:1500;background:var(--card);border:1px solid var(--border);border-radius:9px;padding:10px;width:280px;max-width:calc(100vw - 36px);max-height:45vh;overflow:auto;box-shadow:0 8px 25px #0002;display:grid;grid-template-columns:repeat(7,1fr);gap:6px}

/* 题目与解析：桌面左右分栏，窄屏上下排列 */
#bg-workspace{display:grid;grid-template-columns:minmax(0,1fr);gap:18px;align-items:start;scroll-margin-top:8px}
@media(min-width:1100px){#bg-workspace{grid-template-columns:minmax(0,1.08fr) minmax(0,.92fr)}#bg-analysis-slot{position:sticky;top:12px;min-height:260px}.bg-analysis-placeholder{min-height:210px}}
.panel,.q-panel{background:var(--card);border:1px solid var(--border);border-radius:12px;box-shadow:0 3px 16px #20355204;min-width:0}
.q-body{padding:24px}
.q-stem{font-size:var(--font);line-height:var(--line);font-weight:500;padding:0 0 22px}
.rich{overflow-wrap:anywhere;word-break:normal}
.rich p{margin:6px 0 12px}.rich img{max-width:100%;height:auto}
.rich pre{white-space:pre-wrap;overflow-wrap:anywhere}
.table-wrap{max-width:100%;overflow-x:auto;margin:10px 0;-webkit-overflow-scrolling:touch}
.rich table{border-collapse:collapse;font-size:.86em;line-height:1.6;min-width:60%}
.rich td,.rich th{border:1px solid var(--border);padding:5px 9px;vertical-align:top;text-align:left}
.rich tr:first-child td{background:color-mix(in srgb,var(--blue) 7%,transparent);font-weight:600}
.katex-display{overflow:auto;max-width:100%}

/* 选项卡片 */
.q-options{display:block}
.option{display:flex;align-items:center;gap:14px;width:100%;min-height:58px;padding:12px 16px;margin:0 0 12px;border:1px solid var(--border);border-radius:9px;background:var(--card);color:var(--ink);text-align:left;font-size:var(--font);line-height:1.65;cursor:pointer;transition:background .15s,border-color .15s;-webkit-user-select:text;user-select:text}
.option:hover{border-color:#92bff8;background:#f5f9ff;color:var(--ink)}
.option .sel{flex:0 0 30px;width:30px;height:30px;line-height:28px;border:1px solid #cbd5e3;border-radius:50%;font-size:15px;text-align:center;color:#65748b;background:var(--card);-webkit-user-select:none;user-select:none}
.multi .option .sel{border-radius:6px}
.option .txt{flex:1;min-width:0}
.option.chosen{border-color:#7eb4f8;background:#eff6ff}
.option.chosen .sel{background:var(--blue);border-color:var(--blue);color:#fff}
.option.right{background:#e2f2e7;border-color:#81cfa4;color:#23633c}
.option.right .sel{background:#39a971;border-color:#39a971;color:#fff}
.option.wrong{background:#fbe6e6;border-color:#efaaaa;color:#9b3030}
.option.wrong .sel{background:#e56c6c;border-color:#e56c6c;color:#fff}
.option.locked{cursor:default}
body[data-theme=night] .option:hover{background:#364255}
body[data-theme=night] .option.chosen{background:#2f4566}
body.compact .option{min-height:42px;padding:6px 12px;margin-bottom:7px}
body.compact .q-body{padding:14px 18px}
.finish-row{padding-top:4px}
.finishbtn{border:0;border-radius:8px;padding:10px 24px;min-height:44px;min-width:100px;color:#fff;background:var(--blue);font-size:14px}
.finishbtn:hover{background:#2272d3;color:#fff}
#bg-next-inline{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px 0 0;min-height:46px}
#bg-next-inline.placeholder-hidden{visibility:hidden;pointer-events:none}
#bg-next-inline button{border:0;border-radius:8px;padding:10px 24px;min-height:44px;color:#fff;background:var(--blue);font-size:14px;margin-left:auto}
#bg-result-caption{font-size:13px}
.bg-correct{color:#22854f}.bg-wrong{color:#ca4e4e}.bg-partial{color:#a16e13}

/* 解析栏 */
#bg-analysis-slot{min-width:0;border:1px solid var(--border);border-radius:12px;background:var(--card);overflow:hidden}
.bg-analysis-title{padding:13px 18px;font-size:14px;font-weight:600;color:#6c7e96;border-bottom:1px solid var(--border)}
.bg-analysis-placeholder{min-height:120px;padding:26px 18px;color:#94a1b3;font-size:14px;line-height:1.8}
.bg-analysis-placeholder button{display:block;margin:12px 0 0;border:0;border-radius:6px;padding:8px 14px;background:#eef5ff;color:var(--blue)}
#bg-analysis-body{display:none;padding:6px 0 14px}
#bg-analysis-slot.open #bg-analysis-body{display:block}
#bg-analysis-slot.open .bg-analysis-placeholder{display:none}
.ans-line{padding:6px 18px;font-size:13px;line-height:1.5}
.ans-mine{font-size:12px;padding-top:13px;opacity:.75}
.ans-exp{padding:12px 18px;font-size:var(--font);line-height:var(--line)}
body[data-theme=night] .bg-analysis-placeholder button{background:#3c4a5d;color:#dce7f5}

/* 批注 */
[data-region]{-webkit-user-select:text;user-select:text;-webkit-touch-callout:default}
body.annotate [data-region]{outline:1px dashed #b2c9eb;outline-offset:4px}
mark.bg-mark{color:inherit;border-radius:2px;padding:0;background:#fff1a0}
mark.bg-mark.bg-pink{background:#ffd8df}
mark.bg-mark.bg-line{background:transparent;text-decoration:underline 2px #ed9c39;text-underline-offset:4px}
body[data-theme=night] mark.bg-mark:not(.bg-line){color:#2c3542}
#bg-mark-tools{position:fixed;z-index:1600;padding:7px;display:flex;gap:6px;flex-wrap:wrap;max-width:calc(100vw - 16px);background:var(--card);border:1px solid var(--border);border-radius:9px;box-shadow:0 5px 20px #25395a24;font-size:13px}
#bg-mark-tools button{border:0;border-radius:6px;background:#eff5ff;color:#3269ad;padding:7px 10px;min-height:36px}
#bg-mark-tools button[data-kind=pink]{background:#ffe8ec;color:#a4415a}
#bg-mark-tools button[data-kind=line]{background:#fff3e2;color:#9a5a12}
#bg-mark-tools button[data-kind=remove]{background:#f1f3f6;color:#5d6b7e}

/* 下方面板 */
.bg-panel-d{margin-top:14px;font-size:13px}
.bg-panel-d>summary{cursor:pointer;padding:10px 16px;background:var(--card);border:1px solid var(--border);border-radius:8px;color:var(--ink);list-style:none}
.bg-panel-d>summary::-webkit-details-marker{display:none}
.bg-panel-d[open]>summary{margin-bottom:8px}
.note-box{background:var(--card);border:1px solid var(--border);border-radius:8px;padding:12px 16px}
.bg-note-md-toolbar{display:flex;gap:6px;align-items:center;flex-wrap:wrap;font-size:12px;color:var(--muted)}
.bg-note-md-toolbar button{padding:4px 10px;font-size:12px}
.bg-note-md-toolbar button.on{background:var(--blue);color:#fff;border-color:var(--blue)}
textarea{width:100%;resize:vertical;min-height:70px;margin-top:10px;font-size:15px}
.bg-note-md-preview{margin-top:10px;font-size:15px;line-height:1.8;min-height:60px}
.note-actions{display:flex;align-items:center;gap:10px;font-size:12px;margin-top:8px;color:var(--muted)}
#bg-answer-card{margin-top:16px;padding:14px 16px;border:1px solid var(--border);border-radius:10px;background:var(--card)}
#bg-answer-card h3{margin:0 0 7px;font-size:14px;line-height:1.6;font-weight:500;display:flex;gap:10px;align-items:baseline;flex-wrap:wrap}
#bg-card-stats{font-size:12px;font-weight:400;opacity:.8}
.bg-card-legend{font-size:11px;opacity:.65;margin-bottom:10px}
#card-grid{display:flex;flex-wrap:wrap;gap:7px;max-height:300px;overflow:auto;padding:3px}
.bg-card-grid a{display:inline-flex;align-items:center;justify-content:center;gap:3px;min-width:46px;height:32px;padding:0 8px;border:1px solid var(--border);border-radius:7px;background:var(--card);color:var(--ink);font-size:12.5px;text-decoration:none;font-variant-numeric:tabular-nums}
#card-popup a{min-width:0;width:30px;height:30px;padding:0;font-size:12px}
.bg-card-grid a.st-right{background:#e2f2e7;border-color:#9fd6b5;color:#23633c}
.bg-card-grid a.st-wrong{background:#fbe6e6;border-color:#efb0b0;color:#9b3030}
.bg-card-grid a.st-partial{background:#fff0d1;border-color:#ecd08f;color:#91600c}
#card-popup a.st-right{background:#359b6b;color:#fff}#card-popup a.st-wrong{background:#d85b5b;color:#fff}
.bg-card-grid a.current{outline:2px solid var(--blue);outline-offset:1px}
body.focus #bg-answer-card{display:none}
#history{background:var(--card);border:1px solid var(--border);border-radius:8px;padding:6px 14px;font-size:12.5px;max-height:260px;overflow:auto}
.history-row{border-bottom:1px solid var(--border);padding:7px 0}.history-row:last-child{border:0}
.history-tools{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:8px;font-size:12px;color:var(--muted)}
.history-tools button{font-size:12px;padding:5px 10px}
#bg-time-panel,#bg-stage-time-panel{margin-top:12px;padding:12px 16px;border:1px solid var(--border);border-radius:9px;background:var(--card);font-size:12px;line-height:1.8;font-variant-numeric:tabular-nums}
#bg-time-panel>strong,#bg-stage-time-panel>strong{font-size:13px}
#bg-time-display{margin:8px 0;font-size:13px}
.bg-time-controls{display:flex;gap:8px;flex-wrap:wrap}
#bg-time-panel button{border:0;border-radius:6px;padding:6px 10px;min-height:36px;background:#e4edf6;color:#325478;font-size:12px}
body[data-theme=night] #bg-time-panel button{background:#3c4a5d;color:#dce7f5}
#bg-time-panel small,#bg-stage-time-panel small{display:block;opacity:.7;margin-top:9px;line-height:1.7}
#bg-time-confirm{margin-top:9px;padding:9px;background:#fff1cf;color:#72551e;border-radius:6px;line-height:1.8}
#bg-time-confirm button{margin-left:6px;background:#fff!important;color:#72551e!important}
.tomato-count{font-size:16px;margin-top:6px}
.bg-stage-time-row{padding:9px 0;border-bottom:1px solid var(--border)}
.bg-stage-time-row b{font-size:12.5px}

/* ---------- 底部固定操作栏 ---------- */
#bg-study-bar{position:fixed;bottom:calc(10px + var(--safe-b));left:50%;transform:translateX(-50%);z-index:1000;display:flex;align-items:center;gap:6px;flex-wrap:nowrap;padding:7px 10px;width:max-content;max-width:calc(100vw - 20px);border:1px solid var(--border);border-radius:14px;background:color-mix(in srgb,var(--card) 93%,transparent);box-shadow:0 6px 32px #243e6b16;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);white-space:nowrap;font-size:12px;color:#8a96a7}
#bg-study-bar>button{background:#f1f5fb;border:0;border-radius:7px;padding:7px 10px;color:#425875;font-size:12px;min-height:36px}
#bg-study-bar>button:hover{background:#e3efff;color:var(--blue)}
#bg-study-bar>.bg-next{background:var(--blue);color:#fff}
#bg-study-bar>button.on{background:#fff4dc;color:#a76a00}
#tomato-toggle{font-size:16px!important;background:transparent!important;padding:4px 6px!important}
body[data-theme=night] #bg-study-bar>button{background:#3c4a5d;color:#dce7f5}
body[data-theme=night] #bg-study-bar>.bg-next{background:var(--blue);color:#fff}
#bg-sync-badge{font-size:11px;white-space:nowrap;color:#8a99af;padding:0 4px}
#bg-sync-badge.warn{color:#c27a07}
#bg-status{position:absolute;bottom:calc(100% + 7px);left:50%;transform:translateX(-50%);max-width:calc(100vw - 30px);width:max-content;white-space:normal;padding:5px 10px;background:var(--card);border:1px solid var(--border);border-radius:7px;box-shadow:0 2px 8px #25395a10;font-size:12px;color:#647792}
#bg-status:empty{display:none}

/* AI 浮钮与面板 */
#bg-ai-launcher{position:fixed;right:18px;bottom:calc(20px + var(--safe-b));z-index:1450;border:0;border-radius:22px;padding:11px 17px;min-height:44px;background:#355d53;color:#fff;box-shadow:0 4px 18px #0002;font-size:14px}
#bg-ai-launcher:hover{background:#2c4e45;color:#fff}
#bg-ai-launcher.bg-ai-ready{background:#b4532a}
#bg-ai-panel{position:fixed;right:18px;bottom:calc(72px + var(--safe-b));width:var(--ai-w,480px);height:var(--ai-h,640px);max-width:calc(100vw - 24px);max-height:calc(100dvh - 100px);display:flex;flex-direction:column;overflow:hidden;overscroll-behavior:contain;gap:6px;z-index:1500;padding:9px;background:var(--card);color:var(--ink);border:1px solid var(--border);border-radius:14px;box-shadow:0 10px 40px #0003;font:13px/1.65 -apple-system,BlinkMacSystemFont,'PingFang SC',sans-serif}
#bg-ai-panel button{cursor:pointer;border:0;border-radius:6px;padding:5px 8px;background:var(--page);color:var(--ink);font-size:12px;white-space:nowrap;min-height:30px}
#bg-ai-panel button:disabled{opacity:.5}
#bg-ai-panel select,#bg-ai-panel textarea{background:var(--page);color:var(--ink);border:1px solid var(--border);border-radius:7px;padding:6px 8px;font:inherit}
.bg-ai-header{display:flex;align-items:center;gap:5px;flex-shrink:0;min-width:0}
.bg-ai-header>strong{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:12px}
.bg-ai-display-bar{display:flex;align-items:center;gap:3px;flex-shrink:0}
.bg-ai-font-value{font-size:11px;min-width:33px;text-align:center;font-variant-numeric:tabular-nums}
#bg-ai-size-panel{flex-shrink:0;padding:8px 10px;border:1px solid var(--border);border-radius:8px;background:var(--page)}
#bg-ai-size-panel label{display:flex;flex-direction:row;align-items:center;justify-content:space-between;gap:10px;margin:6px 0;font-size:12px;color:var(--ink)}
#bg-ai-size-panel input[type=range]{width:58%;accent-color:#73988b;padding:0}
.bg-ai-model-setup{flex-shrink:0;font-size:12px}.bg-ai-model-setup:not([open]){display:none}
.bg-ai-model-setup label{flex-direction:row;align-items:center;gap:8px;margin:6px 0;color:var(--ink)}
.bg-ai-model-setup small{display:block;color:var(--muted)}
.bg-ai-round-nav{display:flex;gap:5px;align-items:center;flex-shrink:0;padding:3px 0}.bg-ai-round-nav select{flex:1;min-width:0;font-size:12px}
#bg-ai-messages{flex:1 1 0;min-height:48px;overflow:auto;overscroll-behavior:contain;border:1px solid var(--border);border-radius:9px;padding:6px 0;-webkit-overflow-scrolling:touch}
.bg-ai-help{padding:6px 12px;opacity:.65}
.bg-ai-round{margin-bottom:12px;padding:0 9px 3px}
.bg-ai-round-heading{padding:4px 0;font-size:11px;color:var(--muted);border-bottom:1px dashed var(--border);margin-bottom:4px}
.bg-ai-message{padding:6px 0}.bg-ai-message>b{font-size:11.5px;color:#355d53}
.bg-ai-user .bg-ai-body{white-space:pre-wrap;opacity:.85}
.bg-ai-assistant .bg-ai-body{font-size:var(--ai-font,16px);line-height:1.75}
.bg-ai-assistant .bg-ai-body h1,.bg-ai-assistant .bg-ai-body h2,.bg-ai-assistant .bg-ai-body h3{font-size:1.12em;margin:.6em 0 .3em}
.bg-ai-reply-actions{display:flex;gap:5px;margin-top:5px}
#bg-ai-panel .bg-ai-reply-actions button{color:#355d53;padding:3px 6px;min-height:26px}
#ai-prompt{margin:0;height:54px;min-height:44px;max-height:160px;flex-shrink:0;resize:vertical;font-size:15px}
.bg-ai-actions{display:flex;flex-wrap:wrap;gap:4px;flex-shrink:0}
#bg-ai-panel .bg-ai-actions [data-quick]{color:#355d53;background:#e6f0ec}
#bg-ai-panel .bg-ai-actions .send{background:#355d53;color:#fff}
#ai-status{font-size:11.5px;color:var(--muted)}#ai-status:empty{display:none}
.bg-ai-resize-handle{position:absolute;top:0;left:0;width:16px;height:16px;cursor:nwse-resize;touch-action:none;border-top-left-radius:13px;background:linear-gradient(135deg,#73988b88 0 2px,transparent 2px 5px,#73988b55 5px 7px,transparent 7px);z-index:2}
#bg-mark-tools button[data-kind=ask]{background:#e6f0ec;color:#2d5a4c}

/* 设置面板 */
#bg-settings{position:fixed;right:18px;bottom:calc(80px + var(--safe-b));width:330px;max-width:calc(100vw - 28px);max-height:calc(100dvh - 110px);overflow:auto;z-index:1500;background:var(--card);border:1px solid var(--border);border-radius:14px;box-shadow:0 10px 45px #1c3d6926;padding:18px;color:var(--ink);font-size:14px;line-height:1.6}
#bg-settings h3{font-size:16px;margin:0 0 10px;display:flex;justify-content:space-between;align-items:center}
#bg-settings label{display:flex;flex-direction:row;align-items:center;justify-content:space-between;gap:14px;margin:12px 0;font-size:14px;color:var(--ink)}
#bg-settings input[type=checkbox]{width:17px;height:17px;margin:0;accent-color:var(--blue)}
#bg-settings input[type=range]{width:130px;accent-color:var(--blue);padding:0}
#bg-settings select{max-width:145px;padding:5px}
#bg-settings button{border:0;border-radius:6px;background:#eff5ff;color:#3269ad;padding:7px 10px;min-height:36px}
body[data-theme=night] #bg-settings button{background:#3c4a5d;color:#dce7f5}
#bg-settings small{display:block;color:var(--muted);font-size:12px;margin-top:12px}
#bg-score-rules{font-size:12px;margin-top:14px}#bg-score-rules summary{cursor:pointer;color:#6985a9}#bg-score-rules>div{padding:9px 0;line-height:1.7}
.account-row{display:flex;gap:8px;margin-top:14px;padding-top:12px;border-top:1px solid var(--border)}

/* 计算器 */
#bg-calculator{position:fixed;left:18px;top:75px;z-index:1450;width:610px;height:590px;min-width:min(300px,calc(100vw - 16px));min-height:280px;max-width:calc(100vw - 16px);max-height:calc(100dvh - 16px);resize:both;overflow:hidden;display:flex;flex-direction:column;border:3px solid #2786c1;background:#f0f0f0;color:#111;box-shadow:0 8px 32px #0003;font:14px/1.5 sans-serif}
.bg-calc-header{display:flex;align-items:center;justify-content:space-between;flex-shrink:0;padding:4px 7px;min-height:31px;color:#fff;background:#2786c1;cursor:move;touch-action:none;user-select:none}
.bg-calc-header strong{font-weight:400;pointer-events:none}
.bg-calc-header button{border:1px solid #f0b88b;border-radius:0;width:28px;height:25px;padding:0;background:#c7611b;color:#fff;font:22px/19px Arial}
#calc-frame{display:block;width:100%;min-height:0;flex:1;border:0;background:#f0f0f0}

/* 悬浮番茄钟：与刷题脚本 4.33.2 相同的折叠圆盘与 15 级番茄生长图 */
#bg-tomato-float{position:fixed;left:18px;top:96px;z-index:1350;width:56px;height:56px;max-width:calc(100vw - 16px);color:var(--ink);font:14px/1.4 sans-serif;cursor:grab;touch-action:none;user-select:none;-webkit-user-select:none;transform-origin:28px 28px;transition:width 320ms cubic-bezier(.22,.8,.25,1),height 320ms cubic-bezier(.22,.8,.25,1)}
#bg-tomato-float.bg-dragging,#bg-tomato-float.bg-dragging *{cursor:grabbing!important}
.bg-float-body{position:absolute;left:0;top:0;width:190px;height:250px;border:1px solid var(--border);border-radius:18px;background:var(--card);box-shadow:0 5px 24px #00000012;clip-path:circle(320px at var(--bg-float-origin-x,28px) 28px);transition:clip-path 320ms cubic-bezier(.22,.8,.25,1)}
.bg-float-head{position:absolute;left:14px;top:40px;width:160px;height:160px;cursor:grab;touch-action:none;transform-origin:0 0;transition:transform 320ms cubic-bezier(.22,.8,.25,1),left 320ms cubic-bezier(.22,.8,.25,1),top 320ms cubic-bezier(.22,.8,.25,1)}
.bg-float-dial{width:100%;height:100%;overflow:visible}.bg-float-dial circle{fill:none;stroke-width:2.8}.bg-float-track{stroke:var(--border);opacity:.5}
.bg-float-progress{stroke:#4e73ff;stroke-dasharray:100;stroke-dashoffset:100;stroke-linecap:round;transform:rotate(-90deg);transform-origin:80px 80px;transition:stroke-dashoffset 1s linear}
.bg-float-center{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;pointer-events:none;transition:opacity 180ms ease}
.bg-float-clock{font:36px/1.15 -apple-system,BlinkMacSystemFont,sans-serif;font-variant-numeric:tabular-nums;letter-spacing:-.02em}.bg-float-state{margin-top:6px;font-size:12px;opacity:.58}
.bg-float-tomato{position:absolute;left:11px;top:11px;width:34px;height:34px;border-radius:50%;overflow:hidden;cursor:pointer;touch-action:none;z-index:2}
.bg-float-tomato:focus-visible{outline:2px solid #4e73ff;outline-offset:3px}
.bg-float-rest-icon{display:none;position:absolute;inset:0;place-items:center;padding:4px;font:22px/1 "Apple Color Emoji","Segoe UI Emoji",sans-serif}
.bg-float-tomato.bg-resting img{display:none}.bg-float-tomato.bg-resting .bg-float-rest-icon{display:grid}
.bg-float-tomato img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;transition:opacity 180ms ease-out;user-select:none;-webkit-user-drag:none;pointer-events:none}
.bg-float-actions{position:absolute;left:50%;top:211px;transform:translateX(-50%);display:flex;gap:14px;transition:opacity 180ms ease}
#bg-tomato-float button{border:0;border-radius:50%;width:32px;height:32px;padding:0;cursor:pointer;background:var(--page);color:var(--ink);font-size:18px;line-height:32px}
#bg-tomato-reminder{position:fixed;top:max(18px,env(safe-area-inset-top,0px));left:50%;transform:translateX(-50%);z-index:1800;max-width:calc(100vw - 32px);padding:10px 16px;border-radius:10px;background:var(--card);color:var(--ink);box-shadow:0 5px 25px #0002;font:14px/1.6 sans-serif;cursor:pointer}
#bg-tomato-float.bg-folded{width:56px;height:56px}
#bg-tomato-float.bg-folded .bg-float-body{clip-path:circle(28px at var(--bg-float-origin-x,28px) 28px)}
#bg-tomato-float.bg-folded .bg-float-head{left:3px;top:3px;transform:scale(.3);cursor:pointer}
#bg-tomato-float.bg-folded .bg-float-center,#bg-tomato-float.bg-folded .bg-float-actions{opacity:0;pointer-events:none}
#bg-tomato-float.bg-folded .bg-float-dial circle{stroke-width:8}
#bg-tomato-float.bg-opens-left .bg-float-body{left:auto;right:0}
#bg-tomato-float.bg-opens-left.bg-folded .bg-float-head{left:137px}
#bg-tomato-float.bg-float-instant,#bg-tomato-float.bg-float-instant *{transition:none!important}
#tomato-toggle{font-size:18px!important}

/* 错题本 */
#wrongbook{background:var(--card);border:1px solid var(--border);border-radius:11px;padding:16px 18px;margin:0 0 16px}
.wb-head{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.wb-title strong{font-size:16px;margin-right:8px}.wb-title span{font-size:12px;color:var(--muted)}
.wb-progress{flex:1;min-width:180px;display:flex;align-items:center;gap:10px;font-size:12px;color:var(--muted)}
.wb-bar{flex:1;height:8px;border-radius:5px;background:color-mix(in srgb,var(--border) 70%,transparent);overflow:hidden}
.wb-bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,#4e8df0,#39a971);border-radius:5px;transition:width .4s}
#wb-new-cycle{font-size:12px;padding:6px 12px}
#wb-new-cycle.ready{background:#39a971;border-color:#39a971;color:#fff}
.wb-scopes{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px;margin:14px 0 10px}
.wb-scope{display:flex;flex-direction:column;align-items:flex-start;gap:2px;text-align:left;padding:9px 12px;border-radius:9px;min-height:62px}
.wb-scope b{font-size:13px;font-weight:600}.wb-scope em{font-style:normal;font-size:20px;font-weight:600;font-variant-numeric:tabular-nums;line-height:1.2}.wb-scope small{font-size:11px;color:var(--muted);line-height:1.4}
.wb-scope.active{border-color:var(--blue);background:#eef5ff;box-shadow:inset 0 0 0 1px var(--blue)}
body[data-theme=night] .wb-scope.active{background:#2f4566}
.wb-scope[data-scope=round] em{color:var(--blue)}.wb-scope[data-scope=due] em{color:#d37643}.wb-scope[data-scope=stubborn] em{color:#c94a4a}.wb-scope[data-scope=mastered] em{color:#349972}.wb-scope[data-scope=snoozed] em{color:#8a7a3a}
.wb-kinds{display:flex;gap:6px;flex-wrap:wrap}
.wb-kinds button{font-size:12.5px;padding:5px 12px;border-radius:16px}
.wb-kinds button.active{background:var(--blue);border-color:var(--blue);color:#fff}
.wb-foot{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-top:12px;font-size:12px;color:var(--muted)}
.wb-master{flex-direction:row;align-items:center;gap:6px;color:var(--ink);font-size:12.5px}
.wb-master select{padding:3px 6px;max-width:none}
body.wb-off #wrongbook{display:none}
.wrong-tag{font-size:12px;padding:3px 9px;border-radius:12px;background:#fff1ea;color:#b4532a;white-space:nowrap}
.wrong-tag.ok{background:#e6f5ec;color:#23633c}.wrong-tag.snooze{background:#f4efdc;color:#7a6625}
body[data-theme=night] .wrong-tag{background:#4a3a33;color:#f2c5b1}
#snooze-menu{position:relative}
#snooze-menu>summary{list-style:none;cursor:pointer}#snooze-menu>summary::-webkit-details-marker{display:none}
.snooze-pop{position:fixed;z-index:1500;display:flex;flex-direction:column;gap:4px;padding:8px;min-width:140px;background:var(--card);border:1px solid var(--border);border-radius:9px;box-shadow:0 8px 25px #0002}
.snooze-pop button{text-align:left;font-size:13px;padding:8px 10px;border:0;background:transparent}
.snooze-pop button:hover{background:#eef5ff}
#toast{position:fixed;bottom:calc(90px + var(--safe-b));left:50%;transform:translateX(-50%);background:#263449;color:#fff;padding:10px 20px;border-radius:9px;z-index:9999;max-width:90vw}

/* ---------- 手机与窄屏（按宽度适配，含 Pro / Pro Max 及横屏） ---------- */
@media(max-width:1099px){#bg-analysis-slot{position:static}}
@media(max-width:720px),(max-width:1000px) and (max-height:480px){
 header{padding:0 16px;padding-top:env(safe-area-inset-top,0px);height:auto;min-height:56px}
 .brand{font-size:21px}.brand span{font-size:12px}
 #account{font-size:12px;gap:5px}#account button{font-size:12px;padding:6px 9px;min-height:36px}
 main{padding:18px 12px 90px}
 .page-top h1{font-size:23px}
 .actions button,.file-button{padding:6px 9px;font-size:12px;min-height:36px}
 .stats{gap:8px;grid-template-columns:repeat(2,1fr)}
 .stat{padding:11px 15px}.stat strong{font-size:25px}
 .filters{padding:12px;gap:10px}
 .filters>label{width:calc(50% - 5px)}.filters select{width:100%;max-width:none;font-size:14px}
 .filters .check{width:auto}.filters>.primary{margin-left:auto;padding:9px 16px}
 nav button{padding:10px 16px;font-size:15px}
 .login-card{margin:30px auto;padding:25px}

 body.practicing main{padding:max(4px,env(safe-area-inset-top,0px)) 8px calc(116px + var(--safe-b))}
 body.practicing{scroll-padding-bottom:calc(116px + var(--safe-b))}
 .bg-crumb{display:none}
 .bg-tools{gap:5px;padding:4px 0 8px;margin:0}
 .bg-tools .btn,#bg-compact-card>summary,.bg-tool-question{font-size:12px;padding:3px 8px;min-height:36px}
 #bg-workspace{gap:10px}
 .q-body{padding:12px}
 .q-stem{padding-bottom:14px}
 .option{min-height:52px;padding:10px 8px;gap:8px}
 .ans-line{padding:6px 12px}.ans-exp{padding:10px 12px}
 .bg-analysis-title{padding:11px 12px}
 .bg-analysis-placeholder{min-height:80px;padding:18px 12px}
 #bg-answer-card,#bg-time-panel,#bg-stage-time-panel{padding:12px}
 .bg-card-grid a{min-width:44px;height:36px}
 #bg-study-bar{left:8px;right:8px;transform:none;width:auto;max-width:none;justify-content:flex-start;overflow-x:auto;overscroll-behavior-x:contain;gap:5px;padding:5px 86px 5px 6px;scrollbar-width:none;border-radius:12px;bottom:max(8px,var(--safe-b))}
 #bg-study-bar::-webkit-scrollbar{display:none}
 #bg-study-bar>button{flex:0 0 auto;min-height:44px;padding:8px;font-size:12px}
 #bg-sync-badge{display:none}
 #bg-status{position:fixed;bottom:calc(66px + var(--safe-b));left:50%;max-width:calc(100vw - 24px)}
 #bg-ai-launcher{right:max(10px,env(safe-area-inset-right,0px));bottom:max(13px,calc(var(--safe-b) + 5px));padding:10px 14px;font-size:13px}
 #bg-ai-panel{left:8px;right:8px;top:max(8px,env(safe-area-inset-top,0px));bottom:auto;width:auto;max-width:none;height:calc(100dvh - max(8px,env(safe-area-inset-top,0px)) - max(8px,var(--safe-b)));max-height:none;padding:8px;gap:5px}
 .bg-ai-resize-handle{display:none}
 #ai-prompt{font-size:16px}
 #bg-settings{right:8px;left:8px;width:auto;max-width:none;bottom:calc(68px + var(--safe-b));max-height:calc(100dvh - 90px);padding:14px}
 #bg-settings select{font-size:16px}
 #bg-calculator{left:8px!important;right:8px;top:max(8px,env(safe-area-inset-top,0px))!important;width:calc(100vw - 16px);height:min(590px,calc(100dvh - 24px));resize:none}
 textarea,select,input{font-size:16px}
 #toast{bottom:calc(120px + var(--safe-b))}

}
@media(max-width:600px){#bg-tomato-float{top:70px;left:8px}}
@media(max-width:720px){.wb-scopes{grid-template-columns:repeat(2,1fr)}#wrongbook{padding:14px 12px}.wb-scope{min-height:58px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}

/* Account learning dashboard and private daily Markdown reader */
.learning-home{display:grid;grid-template-columns:230px minmax(0,1fr);gap:16px;margin:12px 0 18px}.exam-card,.learning-card,.daily-focus,.home-details{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:20px;min-width:0}.exam-card{background:linear-gradient(145deg,#e8f0ff,var(--card));color:var(--ink)}.exam-card>span{font-size:12px;color:var(--muted)}.exam-card>div{display:flex;gap:12px;align-items:baseline;margin:8px 0}.exam-card strong{font-size:54px;line-height:1.2;color:var(--blue);font-weight:700}.exam-card b{font-size:16px}.exam-card small{font-size:11px;color:var(--muted)}.learning-head{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}.learning-head h2{font-size:17px;margin:0 0 6px}.learning-head>span,.learning-head small{font-size:12px;color:var(--muted)}.today-activity{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:16px 0}.today-activity span{display:block;font-size:11px;color:var(--muted)}.today-activity strong{display:block;font-size:19px;margin-top:6px}.learning-card>small{display:block;margin-top:7px;color:var(--muted);font-size:11px}#learning-total{font-size:13px}.home-details{padding:13px 18px;margin-bottom:18px}.activity-table{width:100%;min-width:740px;border-collapse:collapse;font-size:12px}.activity-table td,.activity-table th{border-bottom:1px solid var(--border);padding:9px 10px;text-align:left;white-space:nowrap}.activity-table th{font-weight:500}.daily-focus{margin:0 0 20px}.md-label{font-size:10px;background:var(--page);padding:3px 7px;border-radius:5px;color:var(--muted);font-weight:400}.report-tools{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.report-tools select{max-width:180px}.report-tools a{font-size:12px;color:var(--blue)}.report-body{max-height:680px;overflow:auto;padding:14px 0;min-width:0}.report-body h1{font-size:23px}.report-body h2{font-size:19px}.report-body blockquote{font-size:13px;color:var(--muted);border-left:3px solid var(--border);margin:16px 0;padding-left:12px}
/* Keep every table column inside an individually scrollable region, including streaming AI replies. */
#bg-ai-messages{min-width:0;overflow-x:hidden}.bg-ai-round,.bg-ai-message,.bg-ai-body,.report-body{min-width:0;max-width:100%}.bg-ai-body .table-wrap,.report-body .table-wrap{display:block;width:100%;max-width:100%;overflow-x:auto;overscroll-behavior-x:contain;scrollbar-width:thin;touch-action:pan-x pan-y}.bg-ai-body table,.report-body table{width:max-content;min-width:100%;max-width:none;table-layout:auto}.bg-ai-body td,.bg-ai-body th,.report-body td,.report-body th{min-width:105px;max-width:300px;white-space:normal;overflow-wrap:anywhere;word-break:normal}.bg-ai-body .table-wrap::after{content:'↔ 左右滑动查看完整表格';display:block;position:sticky;left:0;font-size:10px;color:var(--muted);padding:5px 0}
@media(max-width:650px){.learning-home{grid-template-columns:1fr;gap:10px}.exam-card{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;padding:14px 18px}.exam-card>div{margin:0 0 0 8px;gap:5px}.exam-card strong{font-size:38px}.exam-card small{width:100%;margin-top:3px}.learning-card,.daily-focus{padding:15px}.today-activity{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.today-activity strong{font-size:18px}.report-body{max-height:70dvh}.report-tools{gap:5px}.report-tools button{font-size:12px;padding:7px 9px}}

/* ---------- 首页分区 Tab 与章节错题 ---------- */
.home-tabs{display:flex;gap:4px;margin:4px 0 18px;border-bottom:1px solid var(--border)}
.home-tabs button{border:0;border-radius:0;background:none;padding:10px 18px;font-size:15px;color:var(--muted);border-bottom:3px solid transparent;min-height:44px}
.home-tabs button.active{color:var(--blue);border-bottom-color:var(--blue);font-weight:600}
.tier-badge{display:inline-flex;align-items:center;padding:1px 8px;border-radius:10px;font-size:11.5px;font-weight:600;line-height:20px;white-space:nowrap;font-style:normal}
.tier-badge.tier-core{background:#fde8e4;color:#b73a22}.tier-badge.tier-key{background:#fff1d6;color:#9a6200}.tier-badge.tier-minor{background:#e3effd;color:#2a62a8}.tier-badge.tier-skip,.tier-badge.tier-unknown{background:#eef0f3;color:#7a8696}
body[data-theme=night] .tier-badge.tier-core{background:#5a2f28;color:#ffc9bd}body[data-theme=night] .tier-badge.tier-key{background:#57452a;color:#ffe0a6}body[data-theme=night] .tier-badge.tier-minor{background:#2c3f5a;color:#c4dcff}body[data-theme=night] .tier-badge.tier-skip{background:#3a4350;color:#c3ccd8}
#tier-tag{margin-right:-2px}
.ct-head{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.ct-subjects{display:flex;gap:6px}.ct-subjects button{padding:7px 16px;border-radius:18px}.ct-subjects button.active{background:var(--blue);border-color:var(--blue);color:#fff}
.ct-hide{flex-direction:row;align-items:center;gap:6px;color:var(--ink);font-size:13px}
.ct-note{line-height:1.9}.ct-note .tier-badge{margin:0 3px}
.ct-overview{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:10px;margin:0 0 18px}
.ct-ov{background:var(--card);border:1px solid var(--border);border-radius:11px;padding:12px 14px;display:flex;flex-direction:column;gap:3px}
.ct-ov span{font-size:12px;color:var(--muted)}.ct-ov strong{font-size:24px;line-height:1.2}.ct-ov .tier-badge{align-self:flex-start}.ct-ov.t-core strong{color:#c0492f}.ct-ov.t-key strong{color:#a16c08}.ct-ov.t-minor strong{color:#2f69b0}.ct-ov small{font-size:11.5px;color:var(--muted)}
.ct-group{margin-bottom:22px}.ct-group>h2{font-size:15px;display:flex;align-items:center;gap:8px;margin:0 0 10px;color:var(--muted);font-weight:500}
.ct-card{background:var(--card);border:1px solid var(--border);border-left:4px solid var(--border);border-radius:11px;padding:14px 16px;margin-bottom:10px}
.ct-card.t-core{border-left-color:#e0765f}.ct-card.t-key{border-left-color:#e7ad3d}.ct-card.t-minor{border-left-color:#6b9ee0}.ct-card.t-skip{border-left-color:#c3cad4}
.ct-card.empty{opacity:.6;padding:10px 16px}.ct-card.empty h3{font-size:14px}.ct-empty{margin:4px 0 0;font-size:12px;color:var(--muted)}
.ct-title{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.ct-card h3{font-size:16px;margin:0;font-weight:600}.ct-card .tier-badge{background-clip:padding-box}
.ct-score{font-size:12px;color:var(--muted)}
.ct-sum-flag{font-size:11px;color:#355d53;background:#e6f0ec;border-radius:9px;padding:1px 7px}
.ct-stats{display:grid;grid-template-columns:1.6fr 1.3fr .7fr .7fr 1fr;gap:10px;margin:12px 0 10px}
.ct-stats>div{display:flex;flex-direction:column;gap:2px;min-width:0}
.ct-stats b{font-size:20px;line-height:1.2;font-variant-numeric:tabular-nums}.ct-stats .ct-main>b{color:#c0492f}.ct-stats b.hot{color:#c94a4a}.ct-stats b.ok{color:#349972}
.ct-stats small{font-size:11.5px;color:var(--muted)}
.ct-kinds{display:inline-flex;gap:4px;flex-wrap:wrap;margin-top:3px}
.ct-kind{font-size:11.5px;padding:2px 8px;border-radius:10px;min-height:26px;line-height:1.4}
.ct-bar{height:6px;border-radius:4px;background:color-mix(in srgb,var(--border) 70%,transparent);overflow:hidden;margin-top:4px}
.ct-bar i{display:block;height:100%;background:linear-gradient(90deg,#4e8df0,#39a971);border-radius:4px}
.ct-actions{display:flex;gap:6px;flex-wrap:wrap}.ct-actions button{font-size:13px;padding:6px 12px;min-height:38px}
.ct-sections{margin-top:10px;border-top:1px dashed var(--border)}
.ct-sec{padding:10px 0;border-bottom:1px dashed var(--border)}.ct-sec:last-child{border-bottom:0}
.ct-sec-main{display:flex;flex-direction:column;gap:3px}
.ct-sec-name{font-size:13.5px;font-weight:500}.ct-real{font-style:normal;font-size:11px;color:#b4532a}.ct-stars{font-style:normal;font-size:11px;color:#d79a16}
.ct-sec-stats{font-size:12px;color:var(--muted);display:flex;gap:4px;align-items:center;flex-wrap:wrap}.ct-sec-stats b{color:var(--ink)}
.ct-sec-actions{display:flex;gap:6px;margin-top:6px}.ct-sec-actions button{font-size:12px;padding:5px 10px;min-height:34px}
.ct-sum{margin-top:12px;border:1px solid #cfe1d9;background:color-mix(in srgb,#e6f0ec 45%,var(--card));border-radius:10px;padding:12px 14px}
body[data-theme=night] .ct-sum{border-color:#3d5a50;background:#26332f}
.ct-sum-head{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:6px}.ct-sum-head strong{font-size:14px;color:#355d53;flex:1;min-width:160px}
.ct-sum-head button{font-size:12px;padding:5px 10px;min-height:32px}.ct-sum-time{font-size:11.5px;color:var(--muted)}
.ct-sum-body{font-size:15px;line-height:1.85}.ct-sum-body h2{font-size:16px;margin:14px 0 6px}.ct-sum-body h3{font-size:15px}
@media(max-width:720px){
 .home-tabs button{flex:1;padding:10px 8px}
 .ct-stats{grid-template-columns:repeat(2,1fr)}.ct-stats .ct-main{grid-column:1/-1}
 .ct-card{padding:12px}.ct-card h3{font-size:15px}
 .ct-actions button{flex:1 1 auto}
 .ct-overview{grid-template-columns:repeat(2,1fr)}
}

/* 章节错题紧凑版：一级一行汇总、一章一行 */
#tab-chapters .ct-head{margin-bottom:6px}
#tab-chapters .ct-note{margin:4px 0 10px;font-size:12px;line-height:1.8}
.ct-overview:empty{display:none}
.ct-group{margin:0 0 8px;background:var(--card);border:1px solid var(--border);border-radius:10px;overflow:hidden}
.ct-group>summary{display:flex;align-items:center;gap:8px;padding:8px 12px;cursor:pointer;list-style:none;font-size:13px;border-left:4px solid var(--border)}
.ct-group>summary::-webkit-details-marker{display:none}
.ct-group>summary::after{content:'▾';margin-left:4px;color:var(--muted);font-size:11px}.ct-group:not([open])>summary::after{content:'▸'}
.ct-group.t-core>summary{border-left-color:#e0765f}.ct-group.t-key>summary{border-left-color:#e7ad3d}.ct-group.t-minor>summary{border-left-color:#6b9ee0}.ct-group.t-skip>summary{border-left-color:#c3cad4}
.ct-gh{color:var(--muted);font-size:12px}.ct-gs{margin-left:auto;font-size:12px;color:var(--muted)}.ct-gs b{color:var(--ink);font-size:14px}
.ct-rows{border-top:1px solid var(--border)}
.ct-row{border-bottom:1px solid var(--border)}.ct-row:last-child{border-bottom:0}
.ct-line{display:grid;grid-template-columns:minmax(200px,2fr) minmax(170px,1.4fr) 120px 74px 62px 92px 268px;align-items:center;gap:8px;padding:6px 12px;min-height:44px}
.ct-row:hover>.ct-line{background:color-mix(in srgb,var(--blue) 4%,transparent)}
.ct-name{display:flex;align-items:baseline;gap:6px;min-width:0;flex-wrap:wrap}.ct-name b{font-size:14px;font-weight:600}.ct-name small{font-size:11px;color:var(--muted);white-space:nowrap}
.ct-ai-dot{font-style:normal;font-size:10px;font-weight:600;color:#355d53;background:#e6f0ec;border-radius:7px;padding:0 5px;line-height:16px}
.ct-c{display:flex;align-items:baseline;gap:4px;font-variant-numeric:tabular-nums;white-space:nowrap;min-width:0}
.ct-c b{font-size:14px}.ct-c b.hot{color:#c94a4a}.ct-c b.ok{color:#349972}.ct-wrong>b{color:#c0492f;font-size:15px}
.ct-c small{font-size:11px;color:var(--muted)}
.ct-kinds{display:inline-flex;gap:3px;margin:0 0 0 2px}
.ct-kind{font-size:11px;padding:0 6px;border-radius:9px;min-height:22px;line-height:20px}
.ct-mini{display:inline-block;width:34px;height:4px;border-radius:3px;background:color-mix(in srgb,var(--border) 70%,transparent);overflow:hidden;align-self:center}
.ct-mini>i{display:block;height:100%;background:#39a971}
.ct-act{display:flex;gap:4px;justify-content:flex-end}
.ct-act button{font-size:12px;padding:3px 9px;min-height:30px;white-space:nowrap}
.ct-none{margin:0;padding:6px 12px;font-size:11.5px;color:var(--muted);border-top:1px dashed var(--border);line-height:1.7}
.ct-sections{background:color-mix(in srgb,var(--page) 55%,var(--card));border-top:1px dashed var(--border)}
.ct-sec{border-bottom:1px dashed var(--border);padding:0}.ct-sec:last-child{border-bottom:0}
.ct-sec .ct-line{grid-template-columns:minmax(200px,2fr) minmax(170px,1.4fr) 120px 228px 268px;padding:4px 12px 4px 26px;min-height:38px}
.ct-sec .ct-name span{font-size:12.5px}.ct-sec .ct-c b{font-size:13px}
.ct-row>.ct-sum,.ct-sec>.ct-sum{margin:4px 12px 10px}
@media(max-width:900px){
 .ct-line,.ct-sec .ct-line{display:grid;grid-template-columns:1fr auto;grid-template-areas:'name act' 'stats stats';gap:3px 8px;padding:7px 10px;min-height:0}
 .ct-line>.ct-name{grid-area:name}.ct-line>.ct-act{grid-area:act;align-self:start}
 .ct-line>.ct-c{display:none}
 .ct-mstats{grid-area:stats;display:flex!important;flex-wrap:wrap;align-items:center;gap:2px 10px;font-size:12px;color:var(--muted)}
 .ct-mstats b{color:var(--ink);font-size:13px}.ct-mstats .w{color:#c0492f;font-size:14px}.ct-mstats .hot{color:#c94a4a}
 .ct-act button{padding:2px 8px;min-height:30px;font-size:12px}.ct-act [data-act=practice-all]{display:none}
 .ct-name b{font-size:13.5px}
 .ct-sec .ct-line{padding:6px 10px 6px 18px}
 .ct-gh{display:none}
}
.ct-mstats{display:none}



/* Daily report preview: vertical page scrolling after expansion, table scroll retained. */
.report-body{max-height:none!important;overflow:visible;padding:14px 0}.report-preview{position:relative;min-width:0}.report-preview.collapsed{max-height:280px;overflow:hidden;mask-image:linear-gradient(to bottom,#000 0,#000 200px,transparent 280px)}#report-toggle{display:block;margin:8px auto 0;color:var(--blue)}.device-resume-list{display:grid;gap:8px;margin:12px 0}.device-resume-list button{white-space:normal;text-align:left}.sync-conflict{color:var(--muted);font-size:12px}

.question-image{display:block;max-width:100%;height:auto;margin:10px 0}

.case-material{padding:12px 16px;margin-bottom:16px;background:var(--bg-page,#f5f7fa);border-radius:8px}

/* A04-C：手机阅读默认尺寸，字号变量由显式用户设置优先。 */
@media(max-width:720px){#bg-ai-panel{font-size:12.5px}#bg-ai-messages .bg-ai-body{line-height:1.65}.bg-tools button,.bg-tools summary{font-size:12px}}

.tool-secondary{display:contents}.seg{display:flex;flex:0 0 auto}.seg button{border-radius:0;margin:0}.seg button+button{border-left:0}.seg button:first-child{border-radius:6px 0 0 6px}.seg button:last-child{border-radius:0 6px 6px 0}
#card-popup,#snooze-pop{max-width:calc(100vw - 16px)}
#bg-next-inline #next-inline{flex-shrink:0;white-space:nowrap}#bg-result-caption button{margin:4px 0 0;padding:4px 8px;min-height:30px;font-size:12px}
@media(max-width:900px){
 #tool-row{flex-wrap:wrap;overflow:visible;white-space:normal;gap:4px;row-gap:4px;padding:4px 0 8px}
 #tool-row .btn,#tool-row summary{min-height:30px;padding:2px 8px;font-size:12px;border-radius:6px;white-space:nowrap}
 #tool-row .bg-tool-question{font-size:0;padding:0;min-height:30px;display:flex;align-items:center}#tool-question::after{content:attr(data-short);font-size:12px;white-space:nowrap}
 #wrong-tag{font-size:0;padding:3px 4px}#wrong-tag::after{content:attr(data-short);font-size:11px;white-space:nowrap}
 #tool-row #tier-tag{font-size:10px;padding:3px 4px}
 #card-summary{font-size:0!important}#card-summary::after{content:'答题卡';font-size:12px}
 #tool-row #back{margin-left:auto}
 .tool-secondary{display:flex;flex-basis:100%;align-items:center;gap:4px}.seg{gap:0}
 #tool-row .seg button{border-radius:0}#tool-row .seg button:first-child{border-radius:6px 0 0 6px}#tool-row .seg button:last-child{border-radius:0 6px 6px 0}
}

#tomato-dock{position:fixed;z-index:1100;left:max(8px,env(safe-area-inset-left,0px));bottom:calc(72px + var(--safe-b));display:flex;align-items:center;gap:5px;height:28px;min-height:28px;padding:2px 8px;border:1px solid var(--border);border-radius:20px;background:var(--card);color:var(--text);box-shadow:0 2px 8px #0002;font-size:12px;font-variant-numeric:tabular-nums}
#tomato-dock[hidden]{display:none}#dock-img{width:20px;height:20px;object-fit:contain}#dock-dot{width:6px;height:6px;border-radius:50%;background:#94a3b8}#dock-dot[data-phase=focus]{background:#22a06b}#dock-dot[data-phase=break]{background:#3b82f6}#dock-dot[data-phase=paused]{background:#e7a028}
body.tomato-docked #bg-status,body.tomato-docked #toast,body.tomato-docked #bg-tomato-reminder{bottom:calc(var(--dock-bottom,72px) + 36px)}
#tf-dock{font-size:10px!important;width:auto!important;min-width:0!important;padding:3px 5px!important;white-space:nowrap}
.bg-float-actions{gap:5px}#tf-dock{border-radius:6px!important}
#tomato-dock{color:var(--ink)}body.tomato-docked #bg-status{position:fixed}body.tomato-docked #bg-tomato-reminder{top:auto;bottom:calc(var(--dock-bottom,72px) + 78px)}

.bank-subjects{display:flex;gap:8px;margin:18px 0}.bank-subjects button.active{background:#3085ef;color:#fff}.bank-filters input{max-width:100px}

.question-source{font-size:12px;line-height:1.45;color:#53657d;margin:0 0 8px;overflow-wrap:anywhere}

.bank-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));gap:10px}.bank-grid small{display:block;color:#667}.bank-card{display:flex;flex-direction:column;align-items:stretch;text-align:left;gap:7px;width:100%;padding:13px;border:1px solid var(--border);border-radius:10px;background:var(--card);color:var(--ink);cursor:pointer;overflow-wrap:anywhere}.bank-card:hover{border-color:#3387ef}.bank-count{font-size:12px;color:#60718a}.bank-progress{display:block;height:6px;background:#e6ebf3;border-radius:5px;overflow:hidden}.bank-progress i{display:block;height:100%;background:#3489ef}.bank-chapter{margin:12px 0}.bank-sections{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,230px),1fr));gap:8px;padding:8px 0 0 15px}#bank-navigation{margin:12px 0;overflow-wrap:anywhere}.bank-loading{height:5px;background:linear-gradient(90deg,#dbe9ff,#3489ef,#dbe9ff);background-size:200% 100%;animation:bank-loading 1.2s linear infinite;border-radius:5px}@keyframes bank-loading{to{background-position:-200% 0}}
.bank-subjects{margin:9px 0;gap:6px}.bank-grid{grid-template-columns:repeat(auto-fit,minmax(min(100%,230px),1fr));gap:6px}.bank-card{padding:8px 10px;gap:3px;border-radius:8px}.bank-card strong{font-size:14px;line-height:1.35}.bank-count{font-size:12px}.bank-progress{height:4px}.bank-chapter{margin:4px 0;border:1px solid var(--border);border-radius:8px;background:var(--card)}.bank-chapter-summary{cursor:pointer;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:2px 10px;align-items:center;padding:8px 10px;font-size:14px}.bank-chapter-summary strong{min-width:0;overflow-wrap:anywhere}.bank-chapter-summary .bank-progress{grid-column:1 / -1}.bank-section-body{padding:0 8px 8px}.bank-sections{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,210px),1fr));gap:5px;padding:5px 0 0 10px}.bank-whole{padding:5px 9px}#bank-navigation{margin:7px 0}.syllabus-tag{display:inline-block;vertical-align:middle;padding:1px 5px;margin:1px 3px;border-radius:9px;background:#e4f1ff;color:#175ea6;font-size:11px;font-weight:600;line-height:1.4;white-space:nowrap}.syllabus-tag.removed{background:#fff0df;color:#8a4b00}.syllabus-tag.review{background:#f1edff;color:#59429a}.syllabus-tags{margin:0 0 6px;font-size:12px}.syllabus-tags:empty{display:none}.syllabus-tags a{font-size:11px;color:#496d9c}
.bank-chapter-summary{grid-template-columns:minmax(0,1fr) auto auto}.bank-chapter-summary::after{content:'展开小节 ▾';grid-column:2;grid-row:1;font-size:11px;color:#60718a}.bank-chapter[open]>.bank-chapter-summary::after{content:'收起小节 ▴'}.bank-chapter-summary .bank-count{grid-column:3;grid-row:1}.bank-chapter-summary .bank-progress{grid-column:1/-1}@media(max-width:600px){.bank-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.bank-chapter-summary::after{content:'展开 ▾'}.bank-chapter[open]>.bank-chapter-summary::after{content:'收起 ▴'}}
.syllabus-details{display:inline-block;font-size:11px;color:#60718a}.syllabus-details summary{cursor:pointer}.syllabus-details p{margin:4px 0;font-size:12px}
.syllabus-tag{cursor:help}.syllabus-tooltip{position:fixed;z-index:10000;box-sizing:border-box;padding:10px 12px;border-radius:9px;background:#233348;color:#fff;box-shadow:0 5px 18px #0003;font-size:13px;line-height:1.55;white-space:pre-line;overflow-wrap:anywhere;pointer-events:none}.syllabus-tooltip[hidden]{display:none}
.wb-partial-setting{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:9px 12px;margin:8px 0;background:#edf5ff;border:1px solid #b7d3f5;border-radius:9px;color:var(--ink)}.wb-partial-setting select{min-height:36px;max-width:100%}.wb-partial-setting small{flex-basis:100%;font-size:12px;color:#536b86}.ct-row>.ct-line[tabindex]{cursor:pointer}.ct-row>.ct-line[tabindex]:focus-visible{outline:2px solid #3285e8;outline-offset:2px}

/* AI 表格：手机纵向阅读，保持每行与列标题的对应。 */
.ai-mobile-cell-label{display:none}
@media(max-width:720px){
 .bg-ai-body .table-wrap{overflow-x:visible;touch-action:auto}
 .bg-ai-body .table-wrap::after{content:none}
 .bg-ai-body table{width:100%;min-width:0;max-width:100%;table-layout:fixed}
 .bg-ai-body td,.bg-ai-body th{min-width:0;max-width:none;padding:4px;overflow-wrap:anywhere;word-break:break-word}
 .bg-ai-body table.ai-mobile-cards,.bg-ai-body .ai-mobile-cards tbody,.bg-ai-body .ai-mobile-cards tr,.bg-ai-body .ai-mobile-cards td{display:block;width:100%;min-width:0;max-width:100%;box-sizing:border-box}
 .bg-ai-body .ai-mobile-cards thead{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
 .bg-ai-body .ai-mobile-cards tr{margin:0 0 9px;border:1px solid var(--border);border-radius:8px;overflow:hidden}
 .bg-ai-body .ai-mobile-cards td{border:0;border-bottom:1px solid var(--border);padding:6px 8px;background:transparent;font-weight:normal}
 .bg-ai-body.rich .ai-mobile-cards tbody tr:first-child td{background:transparent;font-weight:normal}
 .bg-ai-body .ai-mobile-cards td:last-child{border-bottom:0}
 .bg-ai-body .ai-mobile-cell-label{display:block;color:var(--muted);font-size:.82em;font-weight:600;line-height:1.4;margin-bottom:2px}
 .bg-ai-body .katex-display{overflow-wrap:anywhere;white-space:normal}
}

.table-warning{font-size:12px;color:var(--muted);margin:6px 0}

/* 车上模式仅调整当前设备的练习展示，不改变普通模式的用户配置。 */
#car-pause-overlay[hidden]{display:none}
#car-pause-overlay{position:fixed;inset:0;z-index:3000;display:grid;place-items:center;padding:20px;background:#172330a8}
.car-pause-card{width:min(100%,380px);padding:24px;border:1px solid var(--border);border-radius:16px;background:var(--card);color:var(--ink);box-shadow:0 12px 40px #0004}
.car-pause-card strong{font-size:22px}.car-pause-card p{line-height:1.7}.car-pause-card div{display:grid;gap:10px}.car-pause-card button{min-height:52px;border:1px solid var(--border);border-radius:10px;background:var(--page);color:var(--ink);font-size:17px}.car-pause-card #car-resume{background:var(--blue);color:#fff}.car-pause-card small{display:block;margin-top:12px;color:var(--muted)}
body.car-mode.practicing{scroll-behavior:auto}
body.car-mode.practicing *,body.car-mode.practicing *::before,body.car-mode.practicing *::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
body.car-mode.practicing .option,body.car-mode.practicing.compact .option{min-height:68px;padding:15px 16px;margin-bottom:12px;gap:14px;font-size:max(17px,var(--font));line-height:1.6}
body.car-mode.practicing .option .sel{flex-basis:34px;width:34px;height:34px;line-height:32px;font-size:16px}
body.car-mode.practicing #finish{width:100%;min-height:54px;font-size:17px}
body.car-mode.practicing #bg-study-bar{width:min(620px,calc(100% - 16px));max-width:none;justify-content:space-between;gap:8px;padding:7px;overflow:visible}
body.car-mode.practicing #bg-study-bar>button{flex:1 1 0;min-width:0;min-height:52px;font-size:15px;padding:8px 4px}
body.car-mode.practicing #bg-study-bar>button:not(#prev):not(#next):not(#car-pause),body.car-mode.practicing #bg-sync-badge,body.car-mode.practicing #bg-status{display:none}
body.car-mode.practicing #tool-row{gap:6px;overflow-x:auto}
body.car-mode.practicing #tool-row #car-toggle,body.car-mode.practicing #tool-row #car-more,body.car-mode.practicing #tool-row #back,body.car-mode.practicing #card-summary{min-height:44px}
body.car-mode.practicing #tier-tag,body.car-mode.practicing #wrong-tag,body.car-mode.practicing #snooze-menu,body.car-mode.practicing #bg-answer-card{display:none}
body.car-mode.practicing:not(.car-more-open) .tool-secondary,body.car-mode.practicing:not(.car-more-open) #bg-notes,body.car-mode.practicing:not(.car-more-open) #bg-history-panel,body.car-mode.practicing:not(.car-more-open) #bg-time-panel,body.car-mode.practicing:not(.car-more-open) #bg-stage-time-panel,body.car-mode.practicing:not(.car-more-open) #bg-ai-launcher,body.car-mode.practicing:not(.car-more-open) #bg-tomato-float,body.car-mode.practicing:not(.car-more-open) #tomato-dock{display:none}
body.car-mode.practicing.car-more-open #bg-study-bar>button#settings-btn,body.car-mode.practicing.car-more-open #bg-study-bar>button#tomato-toggle{display:inline-flex;flex:0 0 auto;min-width:45px;font-size:12px}
@media(max-width:720px){body.car-mode.practicing #tool-row .bg-tool-question{font-size:13px}body.car-mode.practicing #tool-question::after{content:none}body.car-mode.practicing #bg-study-bar{left:8px;right:8px;transform:none;width:auto;bottom:max(8px,var(--safe-b))}body.car-mode.practicing .q-body{padding:14px}}