/* LearnUp 统一外观（Kent 2026-10-08 确认）：页面加 <body class="lu" data-subject="科目">。规范见 LearnUp统一设计规范.md */
.lu{--lu-a:#15803D;--lu-t:#ECF8F0;--lu-ink:#1f2937;--lu-muted:#5b6472;--lu-line:color-mix(in srgb,var(--lu-a) 22%,#e5e7eb);--lu-soft:color-mix(in srgb,var(--lu-a) 40%,#fff)}
[data-subject="chinese"]{--lu-a:#B91C1C;--lu-t:#FEF1EF}
[data-subject="bahasa-melayu"]{--lu-a:#7E22CE;--lu-t:#F6F0FE}
[data-subject="english"]{--lu-a:#1D4ED8;--lu-t:#EEF3FF}
[data-subject="mathematics"]{--lu-a:#15803D;--lu-t:#ECF8F0}
[data-subject="science"]{--lu-a:#0E7490;--lu-t:#E9F7FA}
[data-subject="moral"]{--lu-a:#C2410C;--lu-t:#FFF3EA}
[data-subject="history"]{--lu-a:#8A5A00;--lu-t:#FBF4E6}
[data-subject="grade"]{--lu-a:#0F5132;--lu-t:#EEF6F3}
body.lu{font-family:"Noto Sans SC","PingFang SC","Noto Sans",system-ui,sans-serif!important;color:var(--lu-ink)!important;background:linear-gradient(170deg,var(--lu-t),#FFFDF8) fixed!important}
/* Kent 2026-10-08：内容从顶部开始（标题栏下留 1–2 行空位），不垂直居中 */
.lu .v2-main .screen{justify-content:flex-start!important;padding-top:12px!important;padding-bottom:14px!important}
/* Kent 2026-10-08：关掉“连按两下放大”，保留两指放大 */
html,.lu,.lu *{touch-action:manipulation}
/* 顶部 */
.lu .v2-top{background:rgba(255,255,255,.88)!important;border-bottom:1px solid rgba(0,0,0,.06)!important;box-shadow:none!important}
.lu .v2-back{background:var(--lu-a)!important;color:#fff!important;border:0!important}
.lu .v2-count{color:var(--lu-a)!important}
.lu .v2-title b{color:var(--lu-ink)!important}
.lu .v2-bar{background:#e5e7eb!important}.lu .v2-bar i{background:var(--lu-a)!important}
.lu .v2-lang{background:#fff!important;color:var(--lu-a)!important;border:1.5px solid var(--lu-soft)!important}
.lu .v2-lang:disabled{opacity:.45}
/* 底部 */
.lu .v2-nav{background:rgba(255,255,255,.88)!important;border-top:1px solid rgba(0,0,0,.06)!important}
.lu .v2-nav .btn,.lu #prev,.lu #next{border-radius:999px!important;font-weight:800!important}
.lu .v2-nav .btn.primary,.lu #next{background:var(--lu-a)!important;color:#fff!important;border:0!important}
.lu .v2-nav .btn.secondary,.lu #prev{background:#fff!important;color:var(--lu-a)!important;border:2px solid var(--lu-soft)!important}
/* 抽屉面板 */
.lu .v2-panel h3{color:var(--lu-a)!important}
.lu .v2-panel .btn.audio{background:var(--lu-a)!important;color:#fff!important;border:0!important;border-radius:999px!important}
.lu .v2-panel .btn.secondary{background:#fff!important;color:var(--lu-a)!important;border:2px solid var(--lu-soft)!important;border-radius:999px!important}
/* 内容：只用一层，不套卡片 */
.lu .v2-main .v2-content.hero{max-height:none!important;overflow:visible!important;width:auto!important}
.lu .v2-main .v2-content{background:transparent!important;border:0!important;box-shadow:none!important;position:relative}
.lu .v2-main .v2-content .question{background:transparent!important;border:0!important;box-shadow:none!important;padding:0!important;margin:0!important}
.lu .v2-main h1,.lu .v2-main h2,.lu .v2-main h3{color:var(--lu-ink)}
.lu .v2-main .sub,.lu .v2-main p{color:#374151}
.lu .badge,.lu .v2-main .eyebrow{display:inline-block;background:var(--lu-t)!important;color:var(--lu-a)!important;border:1px solid var(--lu-line);border-radius:999px;padding:3px 12px;font-weight:800;font-size:.85rem;letter-spacing:0;text-transform:none}
/* 听读按钮：每屏右上角 */
.lu .v2-main .v2-content .listen{position:absolute;top:0;right:0;width:auto!important;min-height:32px!important;padding:3px 12px!important;margin:0!important;border-radius:999px!important;border:1.5px solid var(--lu-soft)!important;background:#fff!important;color:var(--lu-a)!important;font-size:.85rem!important;font-weight:800!important;z-index:2}
.lu .v2-main .v2-content>:first-child,.lu .v2-main .v2-content>.question>:first-child{margin-right:76px}
.lu [data-audio-notice]{display:none!important}
/* p6-unit-covers:start */
/* 封面图统一：每一科、每一课都是同样宽度、同样 4:3 比例；内容太长时这一页可以往下滑，不再把图缩小 */
.lu .cover-screen{overflow:hidden}
.lu .v2-main .cover-screen .v2-content.cover-card{display:flex;flex-direction:column;height:auto;max-height:calc(100dvh - var(--v2-top) - var(--v2-bottom) - 36px)!important;min-height:0;overflow-x:hidden!important;overflow-y:auto!important}
.lu .cover-screen .cover-card>h1,.lu .cover-screen .cover-card>h2{margin:6px 0}
.lu .cover-screen .cover-card>p{margin:4px 0 6px}
.lu .cover-screen .cover-pic{display:block;flex:none;width:100%;max-width:520px;height:auto;aspect-ratio:4/3;min-height:0;max-height:none;margin:8px auto;object-fit:cover;object-position:center;border-radius:20px}
.lu .cover-screen .cover-card>.badge,.lu .cover-screen .cover-card>.eyebrow{align-self:flex-start}
.lu .badge,.lu .v2-main .eyebrow{max-width:calc(100% - 72px)}
@media(max-width:700px) and (min-height:451px){.lu .v2-main .cover-screen .v2-content.cover-card{max-height:calc(100dvh - var(--v2-top) - var(--v2-bottom) - 30px)!important}.lu .cover-screen .cover-pic{max-width:100%}}
@media(max-height:700px) and (min-height:451px){.lu .cover-screen .cover-card{padding:10px 14px}.lu .cover-screen .cover-card>h1,.lu .cover-screen .cover-card>h2{font-size:clamp(1.2rem,3vh,1.55rem)}.lu .cover-screen .cover-card>p{font-size:.9rem;line-height:1.35}}
@media(min-width:701px){.lu .cover-screen .cover-pic{width:auto;max-width:100%;height:clamp(180px,calc(100dvh - 430px),400px)}}
@media(max-height:450px){.lu .cover-screen .cover-pic{display:none}}
/* p6-unit-covers:end */
/* 选项 */
.lu .answer{background:#fff!important;border:2px solid var(--lu-line)!important;border-radius:14px!important;color:var(--lu-ink)!important;font-weight:800}
.lu .answer:hover{border-color:var(--lu-a)!important}
.lu .answer.correct{background:#e9f9ef!important;border-color:#16a34a!important}
.lu .answer.wrong{background:#fff6e8!important;border-color:#d97706!important}
.lu .feedback{border-radius:12px}
.lu .feedback.success{background:var(--lu-t)!important;color:var(--lu-a)!important}
/* 讲解元件 */
.lu .example,.lu .formula,.lu .rule{background:#fff!important;border-color:var(--lu-line)!important;border-radius:14px}
.lu .example{border-left:5px solid var(--lu-a)!important}
.lu .learning-path div{background:var(--lu-t)!important;color:var(--lu-a)!important}
.lu .status-row strong,.lu #score-label{color:var(--lu-a)!important}
.lu .progress span,.lu #practice-progress{background:var(--lu-a)!important}
/* 目录页（科目页、章节页） */
.lu .lu-hero{display:block;width:100%;box-sizing:border-box;background:var(--lu-a);color:#fff;border-radius:18px;padding:14px 18px;margin-bottom:12px}
.lu .lu-hero small{display:block;opacity:.9;font-size:.85rem;font-weight:700}
.lu .lu-hero h1{color:#fff!important;font-size:clamp(1.7rem,7vw,2.4rem);margin:.1rem 0}
.lu .lu-hero p{color:#fff!important;opacity:.95;margin:0;font-size:.95rem}
.lu .lu-list{display:grid;gap:8px}
.lu .lu-ch{display:flex;align-items:center;gap:12px;background:#fff;border-radius:14px;padding:10px 14px;text-decoration:none;color:var(--lu-ink);box-shadow:0 2px 8px rgba(0,0,0,.06)}
.lu .lu-ch b{display:block;font-size:1rem;line-height:1.3}.lu .lu-ch small{color:var(--lu-muted);font-size:.8rem}
.lu .lu-ch i{margin-left:auto;font-style:normal;font-size:1.4rem;font-weight:900;color:var(--lu-a)}
.lu .lu-no{flex:none;display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--lu-t);color:var(--lu-a);font-weight:900;font-size:.9rem}
.lu .lu-chhead{margin:0 0 10px}.lu .lu-chhead small{color:var(--lu-a);font-weight:800}.lu .lu-chhead h1{font-size:clamp(1.5rem,6vw,2.1rem);margin:.1rem 0}
.lu .lu-un{background:#fff;border-radius:14px;padding:10px 14px;box-shadow:0 2px 8px rgba(0,0,0,.06)}
.lu .lu-unh{display:flex;align-items:center;gap:10px}.lu .lu-unh b{font-size:.98rem;line-height:1.3}
.lu .lu-un .lu-no{background:var(--lu-a);color:#fff}
.lu .lu-done{margin-left:auto;color:var(--lu-a);font-weight:900;visibility:hidden}.lu .lu-un.done .lu-done{visibility:visible}
.lu .lu-ub{display:flex;gap:8px;margin-top:8px;padding-left:40px}
.lu .lu-go,.lu .lu-pr{display:inline-flex;align-items:center;min-height:36px;padding:4px 16px;border-radius:999px;font-weight:800;font-size:.9rem;text-decoration:none}
.lu .lu-go{background:var(--lu-a);color:#fff}.lu .lu-pr{background:#fff;color:var(--lu-a);border:1.5px solid var(--lu-soft)}
.lu.lu-menu .v2-lang{display:none!important}
/* 目录页：一页列完，往下滑，不分屏 */
.lu.lu-menu{--v2-bottom:0px}.lu.lu-menu .v2-nav,.lu.lu-menu .v2-count,.lu.lu-menu .v2-bar{display:none!important}
.lu.lu-menu .v2-main{bottom:0!important}.lu.lu-menu .v2-main .screen{justify-content:flex-start!important;padding-bottom:calc(28px + env(safe-area-inset-bottom))!important}
@media(min-width:900px){.lu .lu-list.lu-units{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-height:650px){.lu .lu-chhead{margin-bottom:6px}.lu .lu-chhead h1{font-size:1.35rem}.lu .lu-no{width:24px;height:24px;font-size:.8rem}.lu .lu-unh b{font-size:.9rem}.lu .lu-ub{padding-left:34px}.lu .lu-hero{padding:8px 14px;margin-bottom:8px}.lu .lu-hero p{display:none}.lu .lu-ch{padding:6px 12px}.lu .lu-un{padding:4px 10px}.lu .lu-ub{margin-top:3px}.lu .lu-go,.lu .lu-pr{min-height:28px}.lu .lu-list{gap:6px}}
/* 年级首页 */
.lu .lu-grade{width:min(1080px,calc(100% - 32px));margin:auto;padding:16px 0 40px}
.lu .lu-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px}.lu .lu-logo{font-weight:900;font-size:1.4rem;color:#0F5132}
.lu .lu-pill{margin-left:auto;font-weight:800;font-size:.85rem;color:#0F5132;border:1.5px solid #9cc9b4;border-radius:999px;padding:6px 12px;background:#fff;text-decoration:none}
.lu .lu-gh small{color:#0F5132;font-weight:800}.lu .lu-gh h1{margin:.1rem 0;font-size:clamp(1.6rem,6vw,2.2rem)}.lu .lu-gh p{margin:0 0 14px;color:var(--lu-muted)}
.lu .lu-cards{display:grid;gap:14px}@media(min-width:760px){.lu .lu-cards{grid-template-columns:repeat(3,minmax(0,1fr))}}
.lu .lu-card{background:#fff;border-radius:18px;overflow:hidden;box-shadow:0 4px 14px rgba(15,81,50,.07),0 1px 3px rgba(0,0,0,.05);text-decoration:none;color:var(--lu-ink);display:block}
.lu .lu-card .band{display:flex;align-items:center;gap:14px;padding:14px 16px;background:var(--lu-t)}
.lu .lu-card .ic{flex:none;display:grid;place-items:center;width:50px;height:50px;border-radius:14px;background:var(--lu-a);color:#fff;font-size:1.5rem;font-weight:900}
.lu .lu-card .nm b{display:block;font-size:1.4rem;line-height:1.2;color:var(--lu-a)}.lu .lu-card .nm small{color:var(--lu-muted)}
.lu .lu-card .cb{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:10px 16px 12px}
.lu .lu-card .meta{font-size:.85rem;font-weight:700;color:#4b5563}
.lu .lu-card .go{background:var(--lu-a);color:#fff;font-weight:800;padding:8px 18px;border-radius:999px;white-space:nowrap}
.lu .lu-card.soon{opacity:.55;pointer-events:none}.lu .lu-card.soon .go{background:#f1f3f4;color:#6b7280}
/* 2026-10-08：按钮基本样式（国语、科学等用年级共用 v2-ui.css 的页面原本没有，抽屉里的“听／关闭”按钮会变成很小的系统按钮） */
:where(.lu) .btn{min-height:46px;padding:10px 20px;border-radius:999px;font:inherit;font-weight:800;font-size:16px;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:6px;border:2px solid var(--lu-soft);background:#fff;color:var(--lu-a)}
:where(.lu) .btn.primary{background:var(--lu-a);color:#fff;border-color:var(--lu-a)}
:where(.lu) .btn:disabled{opacity:.4;cursor:default}
.lu .v2-panel .row{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between}
.lu .v2-panel .row .btn{min-height:48px!important;padding:10px 22px!important;font-size:16px!important;font-weight:800!important}
/* 2026-10-08 目录页内容撑满宽度（历史等科目的旧样式会把内容缩窄） */
.lu.lu-menu .v2-main .screen{align-items:stretch!important}
.lu.lu-menu .v2-content{width:100%!important;max-width:880px;margin-left:auto;margin-right:auto;box-sizing:border-box}
/* 2026-10-08 年级统一工具（lu_unify_grade.py）产生的独立目录页 */
.lu.lu-solo{margin:0;min-height:100vh}
.lu.lu-solo .v2-top{position:sticky;top:0;z-index:5;display:flex;align-items:center;gap:10px;padding:10px 16px;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}
.lu.lu-solo .v2-back,.lu.lu-solo .lu-home{display:inline-flex;align-items:center;min-height:40px;padding:6px 14px;border-radius:999px;font-weight:800;text-decoration:none;font-size:.92rem;white-space:nowrap}
.lu.lu-solo .lu-home{background:#fff;color:var(--lu-a);border:1.5px solid var(--lu-soft)}
.lu.lu-solo .v2-title{flex:1;min-width:0}.lu.lu-solo .v2-title b{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:1rem}
.lu.lu-solo .v2-main{position:static;overflow:visible;height:auto}
.lu.lu-solo .v2-main .screen{display:block!important;padding:12px 16px calc(32px + env(safe-area-inset-bottom))!important}
.lu.lu-solo .v2-content{width:100%;max-width:880px;margin:0 auto}
.lu .lu-sec{font-size:1rem;color:var(--lu-a);margin:16px 0 8px}
.lu .lu-lab{display:block;font-size:.78rem;font-weight:700;color:var(--lu-muted);margin-top:2px}
.lu .lu-ub{flex-wrap:wrap}
@media(max-width:420px){.lu.lu-solo .v2-title{display:none}.lu.lu-solo .v2-top{justify-content:space-between}}
/* lu-brand:start  LearnUp 标志（2026-10-09）：年级首页左上角、每个目录页顶部栏右边都用同一个标志 */
.lu .lu-logo.lu-logo-img{display:block;height:36px;width:auto}
.lu.lu-solo .lu-home.lu-home-logo{background:none!important;border:0!important;padding:0 2px;min-height:40px;box-shadow:none}
.lu.lu-solo .lu-home-logo img{display:block;height:28px;width:auto}
.lu.lu-p6menu .v2-count,.lu.lu-p6menu .v2-lang,.lu.lu-p6menu .v2-bar,.lu.lu-p6menu .v2-nav,.lu.lu-p6menu .v2-sheet,.lu.lu-p6menu .v2-panel{display:none!important}
.lu.lu-p6menu .v2-top{flex-wrap:nowrap;min-height:0;height:auto}.lu.lu-p6menu .v2-back,.lu.lu-p6menu .lu-home{box-sizing:content-box}
/* lu-brand:end */