:root{--primary:#0f766e;--primary-dark:#115e59;--primary-soft:#ccfbf1;--amber:#b45309;--ink:#17201e;--muted:#64706d;--line:#dce5e2;--bg:#f4f7f6;--card:#fff;--danger:#c2413b;--success:#16825d;--shadow:0 12px 35px rgba(15,60,55,.08);--radius:16px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:"Noto Sans SC","Microsoft YaHei","PingFang SC",system-ui,sans-serif;color:var(--ink);background:var(--bg);font-size:16px;line-height:1.65}button,textarea{font:inherit}button{cursor:pointer}.skip-link{position:fixed;left:1rem;top:-4rem;z-index:1000;background:#fff;padding:.7rem 1rem;color:var(--primary)}.skip-link:focus{top:1rem}.app-shell{min-height:100vh}.sidebar{position:fixed;inset:0 auto 0 0;width:248px;background:#103b37;color:#fff;padding:28px 18px 20px;display:flex;flex-direction:column;z-index:20}.brand{display:flex;align-items:center;gap:12px;padding:0 8px 28px}.brand-mark{width:40px;height:40px;border-radius:12px;background:#e7b85d;color:#173c38;display:grid;place-items:center;font-weight:800;font-family:serif}.brand strong,.brand small{display:block}.brand 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rgba(15,118,110,.18)}.primary-btn:hover{background:var(--primary-dark)}.secondary-btn{border:1px solid var(--line);background:#fff;color:var(--ink)}.secondary-btn:hover{border-color:#9bb7b2}.plain-btn,.back-btn{border:0;background:transparent;color:var(--primary)}button:focus-visible,textarea:focus-visible{outline:3px solid #f6c35b;outline-offset:2px}.continue-card{background:linear-gradient(125deg,#fff 0%,#ecf9f6 100%);border:1px solid #cde2de;border-radius:22px;padding:30px 32px;display:flex;align-items:flex-end;justify-content:space-between;gap:32px;box-shadow:var(--shadow);position:relative;overflow:hidden}.continue-card:after{content:"课标";position:absolute;right:20%;top:-42px;font:900 120px/1 serif;color:rgba(15,118,110,.045)}.continue-copy{position:relative;z-index:1;max-width:720px}.continue-copy h2{font-size:clamp(22px,2.5vw,32px);line-height:1.3;margin:10px 0 7px}.continue-copy>p:not(.eyebrow){color:var(--muted)}.subject-pill,.status-tag{display:inline-flex;border-radius:999px;padding:4px 10px;font-size:12px;font-weight:800}.subject-pill.math{background:#e4e9ff;color:#3346a8}.subject-pill.warn,.status-tag.warn{background:#fff0d6;color:#8e4b00}.progress-row{display:flex;align-items:center;gap:12px;max-width:440px;margin-top:18px}.progress{height:8px;background:#e1e9e7;border-radius:999px;overflow:hidden;flex:1}.progress span{display:block;height:100%;border-radius:inherit;background:var(--primary)}.section-title{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin:36px 0 16px}.section-title h2,.panel h2{font-size:20px;margin:0 0 3px}.section-title p{color:var(--muted);margin:0;font-size:14px}.compact-title{margin:0 0 18px}.metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.metric-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px}.metric-card 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var(--line);border-radius:50%;display:grid;place-items:center;color:var(--muted);font-size:13px}.task.done .check{background:var(--primary);color:white;border-color:var(--primary)}.task.current strong{color:var(--primary-dark)}.arrow{font-size:26px;color:var(--primary)}.insight-panel{text-align:center}.insight-ring{width:136px;height:136px;border-radius:50%;margin:12px auto 18px;display:grid;place-content:center;background:radial-gradient(circle closest-side,#fff 76%,transparent 77% 99%),conic-gradient(var(--amber) 64%,#f0e9df 0)}.insight-ring span{font-size:28px;font-weight:800}.insight-ring small{display:block;color:var(--muted)}.insight-panel>p{color:var(--muted);text-align:left}.text-btn{border:0;background:transparent;color:var(--primary);font-weight:800}.subject-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}.subject-card{border:1px solid var(--line);background:#fff;border-radius:14px;padding:18px;text-align:left;min-height:128px;transition:.2s}.subject-card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.subject-card.active{border-color:var(--subject);box-shadow:inset 0 3px var(--subject)}.subject-card strong{display:block;font-size:19px;margin:12px 0 4px}.subject-card small{color:var(--muted)}.subject-dot{display:block;width:12px;height:12px;border-radius:50%;background:var(--subject)}.course-detail{margin-top:20px}.module-list{display:grid;gap:9px}.module{display:grid;grid-template-columns:42px 1fr auto;gap:14px;align-items:center;border:1px solid #edf1f0;border-radius:12px;padding:14px}.module>span{width:34px;height:34px;background:#edf3f1;border-radius:9px;display:grid;place-items:center;font-size:12px;font-weight:800}.module.complete>span{background:var(--primary-soft);color:var(--primary-dark)}.module.active-module{border-color:#90c9c2;background:#f4fbfa}.module b{font-size:14px}.learning-view{max-width:none}.learning-top{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:18px;margin-bottom:20px}.learning-top>div{display:grid;text-align:center}.learning-top span{font-size:13px;color:var(--muted)}.save-status{color:var(--success)!important}.learning-layout{display:grid;grid-template-columns:210px minmax(0,760px) 220px;justify-content:center;gap:28px}.lesson-toc{position:sticky;top:28px;align-self:start}.lesson-toc button{width:100%;border:0;background:transparent;text-align:left;padding:10px 6px;display:flex;gap:10px;color:var(--muted)}.lesson-toc button span{width:24px;height:24px;border-radius:50%;border:1px solid var(--line);display:grid;place-items:center;font-size:12px;flex:0 0 auto}.lesson-toc .toc-current{color:var(--primary-dark);font-weight:800}.lesson-toc .toc-current span,.lesson-toc .toc-done span{background:var(--primary);color:#fff;border-color:var(--primary)}.lesson-body{background:#fff;border:1px solid var(--line);border-radius:18px;padding:clamp(26px,4vw,54px);box-shadow:0 8px 26px rgba(30,66,61,.05)}.lesson-body h1{font-family:"Noto Serif SC","Songti SC",serif}.lesson-body .lead{font-size:18px}.lesson-body h2{font-size:22px;margin-top:34px}.standard-quote{margin:30px 0;background:#eff9f7;border-left:4px solid var(--primary);padding:20px 22px}.standard-quote span{font-weight:800;color:var(--primary)}.standard-quote p{font-family:"Noto Serif SC","Songti SC",serif;font-size:18px;margin:8px 0 0}.comparison{display:grid;grid-template-columns:1fr 1fr;gap:13px}.case-card{border:1px solid var(--line);border-radius:13px;padding:18px}.case-card span{font-size:12px;font-weight:800}.case-card h3{font-size:17px;margin:5px 0}.case-card p{color:var(--muted);margin:0}.case-card.weak span{color:var(--danger)}.case-card.good{border-color:#aad7ca;background:#f5fbf9}.case-card.good span{color:var(--success)}.lesson-summary{margin:32px 0;background:#fff8e9;border:1px solid #f0d8a7;border-radius:13px;padding:18px}.lesson-summary p{margin:4px 0 0}.lesson-next{width:100%}.lesson-aside{position:sticky;top:28px;align-self:start;background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px}.lesson-aside ul{list-style:none;padding:0;margin:12px 0 22px}.lesson-aside li{font-size:14px;color:var(--muted);padding:5px 0 5px 18px;position:relative}.lesson-aside li:before{content:"";position:absolute;left:0;top:12px;width:7px;height:7px;border-radius:50%;background:#d3dedb}.lesson-aside li.done-dot{color:var(--success)}.lesson-aside li.done-dot:before{background:var(--success)}.lesson-aside label{display:block;font-weight:800;font-size:14px;margin-bottom:6px}.lesson-aside textarea{width:100%;min-height:130px;border:1px solid var(--line);border-radius:9px;padding:10px;resize:vertical}.test-shell{max-width:800px;margin:0 auto}.test-head{display:flex;justify-content:space-between;align-items:flex-start}.test-head h1{font-size:32px}.question-progress{height:6px;background:#dfe8e5;border-radius:999px;margin:18px 0 26px;overflow:hidden}.question-progress span{display:block;height:100%;background:var(--primary);transition:width .2s}.question-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:clamp(24px,5vw,48px);min-height:400px}.question-card h2{font-size:22px;line-height:1.55}.option-list{display:grid;gap:10px;margin-top:24px}.option{display:flex;gap:12px;align-items:flex-start;border:1px solid var(--line);border-radius:11px;padding:14px;background:#fff;text-align:left}.option:hover{border-color:#94bdb8}.option.selected{border-color:var(--primary);background:#eff9f7}.option-letter{width:27px;height:27px;border-radius:50%;border:1px solid #aebebb;display:grid;place-items:center;flex:0 0 auto}.option.selected .option-letter{background:var(--primary);color:#fff;border-color:var(--primary)}.test-actions{display:flex;align-items:center;justify-content:space-between;margin-top:18px}.test-actions span{color:var(--muted);font-size:13px}.result-hero{text-align:center;max-width:700px;margin:0 auto 30px}.result-hero p:last-child{color:var(--muted)}.result-check{width:58px;height:58px;border-radius:50%;background:var(--primary);color:#fff;display:grid;place-items:center;font-size:28px;margin:0 auto 15px}.result-grid{display:grid;grid-template-columns:1.3fr 1fr;gap:18px}.mastery-row{display:grid;grid-template-columns:140px 1fr 46px;align-items:center;gap:12px;margin:20px 0}.recommendation p{color:var(--muted)}.center-actions{display:flex;justify-content:center;gap:10px;margin-top:24px}.report-summary{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.report-summary article{padding:22px;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}.report-summary span,.report-summary small{display:block;color:var(--muted)}.report-summary strong{font-size:28px;display:block;margin:5px 0}.topic-row{display:grid;grid-template-columns:150px 1fr 42px;align-items:center;gap:12px;margin:16px 0}.advice-item{display:flex;gap:14px;border-top:1px solid #edf1f0;padding:16px 0}.advice-item:first-of-type{border-top:0}.advice-item>span{color:var(--primary);font-weight:900}.advice-item p{color:var(--muted);margin:3px 0}.admin-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:18px;margin-top:18px}.subject-bar{display:grid;grid-template-columns:70px 1fr 42px;align-items:center;gap:12px;margin:17px 0}.bar-track{height:13px;background:#edf1f0;border-radius:3px;overflow:hidden}.bar-track span{display:block;height:100%;background:var(--bar)}.weak-list{list-style:none;padding:0;margin:0}.weak-list li{display:flex;gap:13px;align-items:center;padding:15px 0;border-top:1px solid #edf1f0}.weak-list li:first-child{border-top:0}.weak-list li>span{width:30px;height:30px;border-radius:50%;background:#fff0d6;color:#8e4b00;display:grid;place-items:center;font-weight:900}.weak-list small{display:block;color:var(--muted)}.teacher-table-panel{margin-top:18px}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;min-width:650px}th,td{text-align:left;padding:13px;border-top:1px solid #edf1f0}th{font-size:13px;color:var(--muted)}.status-tag.danger{background:#feeae7;color:#a82e27}.mobile-header,.mobile-nav{display:none}.hidden{display:none!important}.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,20px);background:#153c38;color:white;padding:11px 18px;border-radius:10px;opacity:0;pointer-events:none;transition:.2s;z-index:100}.toast.show{opacity:1;transform:translate(-50%,0)}
@media(max-width:1100px){.learning-layout{grid-template-columns:180px minmax(0,1fr)}.lesson-aside{display:none}.subject-grid{grid-template-columns:repeat(3,1fr)}.metric-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:760px){body{padding-bottom:72px}.sidebar{display:none}.mobile-header{display:flex;position:sticky;top:0;z-index:20;background:#103b37;color:#fff;align-items:center;justify-content:space-between;padding:10px 15px}.mobile-header .brand{padding:0}.mobile-header .brand-mark{width:34px;height:34px;border-radius:9px}.mobile-header .plain-btn{color:#fff;padding:6px}.main-content{margin-left:0;padding:24px 16px 36px}.mobile-nav{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:30;background:#fff;border-top:1px solid var(--line);padding:7px max(8px,env(safe-area-inset-right)) calc(7px + env(safe-area-inset-bottom)) max(8px,env(safe-area-inset-left));justify-content:space-around}.mobile-nav button{border:0;background:transparent;min-height:44px;color:var(--muted);font-size:13px}.mobile-nav button.active{color:var(--primary);font-weight:800}.page-head{display:block}.page-head>.secondary-btn,.page-head>.primary-btn{margin-top:14px}.continue-card{display:block;padding:22px}.continue-card .primary-btn{width:100%;margin-top:17px}.continue-card:after{right:-30px}.metric-grid,.two-col,.subject-grid,.result-grid,.report-summary,.admin-grid{grid-template-columns:1fr}.metric-grid{grid-template-columns:repeat(2,1fr)}.metric-card{padding:16px}.metric-card strong{font-size:25px}.subject-grid{grid-template-columns:repeat(2,1fr)}.subject-card{min-height:112px}.course-detail .section-title{display:block}.course-detail .primary-btn{margin-top:14px;width:100%}.learning-top{align-items:flex-start}.learning-top>div{display:none}.learning-layout{display:block}.lesson-toc{display:none}.lesson-body{padding:24px 19px;border-radius:13px}.lesson-body h1{font-size:29px}.comparison{grid-template-columns:1fr}.lesson-next{position:sticky;bottom:78px;z-index:10}.test-actions{gap:8px}.test-actions span{display:none}.test-actions button{flex:1}.question-card{min-height:360px}.mastery-row,.topic-row{grid-template-columns:110px 1fr 40px}.center-actions{display:grid}.result-hero{text-align:left}.result-check{margin-left:0}.report-cols{grid-template-columns:1fr}.admin-metrics{grid-template-columns:repeat(2,1fr)}.learning-top .save-status{display:block}.toast{bottom:86px;width:calc(100% - 32px);text-align:center}}
@media(max-width:390px){.metric-grid,.admin-metrics{grid-template-columns:1fr}.subject-grid{grid-template-columns:1fr}.mastery-row,.topic-row{grid-template-columns:1fr}.mastery-row strong,.topic-row strong{text-align:right}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation:none!important;transition:none!important}}
@media print{.sidebar,.mobile-header,.mobile-nav,.page-head button{display:none!important}.main-content{margin:0;padding:20px}.view{display:none!important}#view-report{display:block!important}.panel,.report-summary article{break-inside:avoid}}

/* Local teacher sign-in and first-login subject selection */
.auth-shell{position:relative;min-height:100vh;display:grid;grid-template-columns:minmax(260px,1fr) minmax(380px,560px);align-items:center;gap:clamp(30px,8vw,120px);padding:clamp(24px,7vw,96px);background:linear-gradient(120deg,#103b37 0 43%,#f4f7f6 43%)}
.auth-brand{position:absolute;z-index:1;left:clamp(40px,6vw,96px);top:clamp(40px,5vw,72px);color:#fff;display:flex;align-items:center;gap:14px;max-width:320px}.auth-brand strong,.auth-brand small{display:block}.auth-brand strong{font-size:28px}.auth-brand small{opacity:.78}
.auth-card{grid-column:2}
.auth-card,.subject-onboarding{width:100%;max-width:520px;background:#fff;border:1px solid var(--line);border-radius:22px;padding:clamp(26px,5vw,46px);box-shadow:var(--shadow)}
.auth-card h1,.subject-onboarding h1{font-size:clamp(28px,4vw,40px);line-height:1.2;margin:8px 0 12px}.auth-intro,.subject-onboarding>p{color:var(--muted)}
.field{display:grid;gap:7px;margin-top:18px}.field span{font-weight:800;font-size:14px}.field input{font:inherit;width:100%;min-height:48px;border:1px solid #bdceca;border-radius:10px;padding:10px 13px;color:var(--ink);background:#fff}.field input:focus{outline:3px solid #f6c35b;outline-offset:1px;border-color:var(--primary)}
.auth-submit{width:100%;margin-top:8px}.form-error{min-height:25px;color:var(--danger);margin:8px 0 0;font-size:14px}.demo-account{margin-top:22px;padding-top:17px;border-top:1px solid var(--line);display:grid;color:var(--muted);font-size:13px}.demo-account strong{color:var(--ink)}
.subject-onboarding{max-width:820px;margin:auto}.subject-choice-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin-top:28px}.subject-choice{min-height:118px;border:1px solid var(--line);background:#fff;border-radius:14px;padding:18px 10px;text-align:center;font-weight:800;transition:.2s}.subject-choice:hover,.subject-choice:focus-visible{border-color:var(--choice);box-shadow:inset 0 3px var(--choice);transform:translateY(-2px)}.subject-choice span{display:block;width:14px;height:14px;margin:0 auto 14px;border-radius:50%;background:var(--choice)}
.logout-word{font-size:12px;opacity:.68}
#subjectScreen{display:flex;align-items:center;justify-content:center;background:var(--bg)}
@media(max-width:760px){.auth-shell{grid-template-columns:1fr;align-content:center;background:linear-gradient(180deg,#103b37 0 29%,#f4f7f6 29%);padding:24px 16px}.auth-brand{position:static;justify-self:start;margin:0 8px;max-width:none}.auth-brand strong{font-size:20px}.auth-card{grid-column:1;padding:26px 20px}.subject-onboarding{padding:28px 20px}.subject-choice-grid{grid-template-columns:repeat(2,1fr)}}

/* Administrator account import and user activity */
/* Learning flow: explicit completion, module quizzes and review. */
.study-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-top:20px}
.study-actions{display:flex;gap:12px;flex-wrap:wrap;margin:20px 0}.study-actions a{text-decoration:none}
.study-module h2{margin-top:10px}.study-module p{color:var(--muted)}
.study-lesson{margin-top:20px;max-width:900px}.study-lesson section{padding:24px 0;border-bottom:1px solid var(--line)}
.study-pitfall{background:#fff6e8;border-left:3px solid var(--amber);padding:14px 18px;margin-top:16px}.study-pitfall p{margin:4px 0}
.study-question{margin:24px 0;min-width:0}.study-question legend{font-weight:700;color:var(--primary);padding:0 8px}
.study-option{display:flex;align-items:flex-start;gap:12px;padding:15px 12px;margin-top:10px;border:1px solid var(--line);border-radius:10px;cursor:pointer;min-height:48px}
.study-option:has(input:checked){background:#e8f8f3;border-color:var(--primary)}.study-option input{margin-top:7px;flex-shrink:0;accent-color:var(--primary)}
.answer-wrong{border-left:5px solid var(--danger)}.answer-correct{border-left:5px solid var(--success)}
.report-module{display:flex;gap:16px;align-items:center;justify-content:space-between;padding:18px 0;border-top:1px solid var(--line)}
button:disabled{cursor:default;opacity:.6}.review-feedback{color:var(--primary-dark)}#view-study .eyebrow{font-size:14px}
@media(max-width:900px){.study-grid{grid-template-columns:1fr}.report-module{flex-wrap:wrap}.account-grid{grid-template-columns:1fr}}
input{font:inherit}
input:focus-visible{outline:3px solid #f6c35b;outline-offset:2px}
.account-manager{margin-top:18px}
.account-grid{display:grid;grid-template-columns:minmax(260px,.8fr) minmax(380px,1.4fr);gap:28px}
.account-form{border-top:1px solid var(--line);padding-top:18px}
.account-form h3{font-size:16px;margin:0}
.account-form .field{margin-top:12px}
.account-form input,.account-form textarea,.table-search input{width:100%;border:1px solid #bdceca;border-radius:9px;padding:10px 12px;background:#fff;color:var(--ink)}
.account-form textarea{min-height:118px;resize:vertical}
.account-form .primary-btn{margin-top:14px}
.form-heading{display:flex;align-items:center;justify-content:space-between;gap:16px}
.form-feedback{min-height:26px;margin:12px 0 0;color:var(--muted)}
.form-feedback.success{color:var(--success)}
.form-feedback.error{color:var(--danger)}
.table-search input{min-height:42px;width:min(280px,100%)}
#view-admin table{min-width:980px}
#view-admin th,#view-admin td{white-space:nowrap}
.empty-cell{text-align:center;color:var(--muted);padding:28px}
.progress-cell{min-width:130px}
.progress-cell>span{display:flex;align-items:center;gap:9px}
.progress-cell .progress{min-width:70px}
.status-tag.success{background:var(--primary-soft);color:var(--primary-dark)}
.row-actions{display:flex;gap:7px}.mini-btn{border:1px solid var(--line);border-radius:7px;background:#fff;color:var(--primary-dark);padding:6px 9px;font-size:13px;min-height:34px}.mini-btn:hover{border-color:#90b8b3}.mini-btn.danger-btn{color:var(--danger)}.mini-btn.danger-btn:hover{border-color:#e5a39e;background:#fff7f6}
.visually-hidden{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
@media(max-width:760px){.account-grid{grid-template-columns:1fr}.teacher-table-panel .section-title{display:block}.table-search{display:block;margin-top:12px}.table-search input{width:100%}}
.actual-progress{width:100%;height:8px;border:0;border-radius:5px;overflow:hidden;appearance:none;background:#e2ece9}.actual-progress::-webkit-progress-bar{background:#e2ece9}.actual-progress::-webkit-progress-value{background:#0f766e}.actual-progress::-moz-progress-bar{background:#0f766e}