:root{--p:#6f42c1;--p2:#efe8fb;--ink:#241b31;--muted:#746b7f;--line:#e8e2ee;--bg:#f7f5f9;--danger:#b42318;--ok:#067647}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}a{color:var(--p);text-decoration:none}.wrap{width:min(1120px,92vw);margin:auto}.nav{background:#fff;border-bottom:1px solid var(--line);padding:14px 0;position:sticky;top:0;z-index:5}.nav .wrap{display:flex;align-items:center;justify-content:space-between}.brand{font-size:20px;font-weight:800}.navlinks{display:flex;gap:14px;align-items:center}.page{padding:28px 0 60px}.hero,.card{background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:0 10px 28px rgba(50,31,70,.05)}.hero{padding:48px;text-align:center}.hero h1{font-size:42px;margin:0 0 12px}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px}.card{padding:22px}.card h2,.card h3{margin-top:0}.btn{display:inline-flex;border:0;border-radius:11px;padding:10px 16px;background:var(--p);color:#fff;cursor:pointer;font-weight:650}.btn.secondary{background:var(--p2);color:var(--p)}.btn.danger{background:#fee4e2;color:var(--danger)}.btn.small{padding:7px 11px;font-size:13px}input,textarea,select{width:100%;border:1px solid #d8d1df;border-radius:10px;padding:11px 12px;font:inherit;background:#fff}textarea{min-height:90px;resize:vertical}label{display:block;font-weight:650;margin:12px 0 6px}.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.row>*{flex:1}.actions{display:flex;gap:8px;flex-wrap:wrap}.flash{padding:12px 15px;border-radius:12px;margin-bottom:14px;background:#eef4ff}.flash.error{background:#fee4e2;color:var(--danger)}.flash.success{background:#dcfae6;color:var(--ok)}table{width:100%;border-collapse:collapse;background:#fff}th,td{text-align:left;padding:12px;border-bottom:1px solid var(--line);vertical-align:top}.muted{color:var(--muted)}.badge{display:inline-block;padding:4px 9px;border-radius:999px;background:var(--p2);color:var(--p);font-size:12px}.badge.ok{background:#dcfae6;color:var(--ok)}.badge.off{background:#eee;color:#666}.section-head{display:flex;align-items:center;justify-content:space-between;gap:14px;margin:26px 0 14px}.section-head h1,.section-head h2{margin:0}.stat{font-size:30px;font-weight:800}.login{width:min(430px,92vw);margin:55px auto}.login .card{padding:30px}.empty{padding:28px;text-align:center;color:var(--muted)}@media(max-width:650px){.hero{padding:32px 18px}.hero h1{font-size:32px}.navlinks{font-size:14px}.hide-mobile{display:none}.row>*{flex-basis:100%}th,td{padding:9px;font-size:14px}}

/* Homework OS 2.0.1 · Teacher Workspace */
.workspace-hero{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;padding:34px 36px;border-radius:26px;background:linear-gradient(135deg,#28143f 0%,#6f42c1 62%,#8a64d2 100%);color:#fff;box-shadow:0 24px 60px rgba(65,35,102,.22)}.workspace-hero h1{font-size:36px;line-height:1.15;margin:9px 0 8px}.workspace-hero p{margin:0;color:rgba(255,255,255,.75)}.eyebrow{display:block;font-size:11px;font-weight:800;letter-spacing:.16em;color:#8762c5}.workspace-hero .eyebrow{color:#d9c9f3}.workspace-primary{background:#fff;color:#5f35aa;box-shadow:0 8px 24px rgba(35,14,58,.22)}.metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:18px 0 32px}.metric-card{display:flex;align-items:center;gap:15px;padding:20px;background:#fff;border:1px solid var(--line);border-radius:18px;color:var(--ink);box-shadow:0 10px 26px rgba(50,31,70,.045)}.metric-card:hover,.class-card:hover,.quick-card:hover{transform:translateY(-2px);box-shadow:0 16px 34px rgba(50,31,70,.09)}.metric-card,.class-card,.quick-card{transition:.18s ease}.metric-icon{display:grid;place-items:center;width:43px;height:43px;flex:0 0 43px;border-radius:14px;background:var(--p2);color:var(--p);font-weight:900}.metric-card strong{display:block;font-size:27px;line-height:1}.metric-card div span{display:block;margin-top:6px;color:var(--muted);font-size:13px}.metric-card.attention .metric-icon{background:#fff0e8;color:#b54708}.workspace-section{margin-bottom:30px}.section-head.compact{margin:0 0 14px}.section-head.compact h2{font-size:22px;margin-top:4px}.quick-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.quick-card{position:relative;display:flex;align-items:center;gap:13px;padding:18px;background:#fff;border:1px solid var(--line);border-radius:18px;color:var(--ink)}.quick-card>span{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:var(--p2);color:var(--p);font-weight:900}.quick-card strong,.quick-card small{display:block}.quick-card small{margin-top:4px;color:var(--muted);font-size:12px}.quick-card.featured{background:#f5f0fc;border-color:#d9c9ef}.quick-card.disabled{opacity:.68;cursor:not-allowed}.quick-card em{position:absolute;right:12px;top:10px;font-style:normal;font-size:10px;color:var(--p)}.workspace-columns{display:grid;grid-template-columns:minmax(0,1.75fr) minmax(290px,.75fr);gap:22px;align-items:start}.class-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.class-card{display:block;padding:20px;background:#fff;border:1px solid var(--line);border-radius:20px;color:var(--ink)}.class-card-top,.class-meta,.class-footer{display:flex;align-items:center;justify-content:space-between;gap:12px}.class-avatar{display:grid;place-items:center;width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,#ede3fb,#d8c3f4);color:#6037a7;font-weight:900}.status-dot{font-size:11px;color:var(--ok);background:#e7f8ed;padding:4px 8px;border-radius:999px}.class-card h3{font-size:19px;margin:18px 0 14px}.class-meta{justify-content:flex-start;color:var(--muted);font-size:13px}.class-meta span{padding-right:16px}.class-meta b{color:var(--ink);font-size:16px}.class-footer{border-top:1px solid var(--line);margin-top:17px;padding-top:14px;color:var(--muted);font-size:12px}.class-footer b{color:var(--p)}.create-panel{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-top:14px;padding:20px 22px;border:1px dashed #cdbbe6;border-radius:20px;background:#faf8fd}.create-panel h3{margin:4px 0}.create-panel p{margin:0;color:var(--muted);font-size:13px}.inline-create{display:flex;gap:10px;min-width:min(420px,55%)}.activity-panel{position:sticky;top:82px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:0 12px 30px rgba(50,31,70,.05)}.activity-list{display:flex;flex-direction:column}.activity-item{display:grid;grid-template-columns:10px minmax(0,1fr) auto;gap:10px;align-items:center;padding:14px 0;border-bottom:1px solid var(--line);color:var(--ink)}.activity-mark{width:8px;height:8px;border-radius:50%;background:var(--p)}.activity-item strong,.activity-item small{display:block}.activity-item small{margin-top:4px;color:var(--muted);font-size:12px}.activity-item em{font-style:normal;font-size:11px;color:var(--ok);background:#e7f8ed;padding:4px 7px;border-radius:999px}.activity-item em.locked{color:#666;background:#eee}.text-link{display:inline-block;margin-top:16px;font-weight:700}.empty-panel{grid-column:1/-1;display:flex;flex-direction:column;gap:6px;padding:34px;text-align:center;border:1px dashed #d6cbe1;border-radius:18px;color:var(--muted)}.empty-panel strong{color:var(--ink)}.empty-panel.small{padding:24px 10px}.nav{backdrop-filter:blur(12px);background:rgba(255,255,255,.92)}
@media(max-width:900px){.metric-grid,.quick-grid{grid-template-columns:repeat(2,1fr)}.workspace-columns{grid-template-columns:1fr}.activity-panel{position:static}.inline-create{min-width:0;width:100%}.create-panel{align-items:stretch;flex-direction:column}}
@media(max-width:600px){.workspace-hero{align-items:flex-start;flex-direction:column;padding:26px 22px}.workspace-hero h1{font-size:29px}.metric-grid,.quick-grid,.class-grid{grid-template-columns:1fr}.metric-card{padding:16px}.inline-create{flex-direction:column}.section-head.compact{align-items:flex-start;flex-direction:column}.workspace-primary{width:100%;justify-content:center}}

/* Homework OS 2.0.1 · Schedule workflow */
.compact-hero{align-items:center}.workspace-entry-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:20px 0}.workspace-entry{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:16px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:22px;color:var(--ink);box-shadow:0 10px 28px rgba(50,31,70,.05);transition:.18s ease}.workspace-entry:hover{transform:translateY(-2px);box-shadow:0 18px 38px rgba(50,31,70,.1)}.workspace-entry.primary-entry{background:linear-gradient(135deg,#f3ecfc,#fff);border-color:#d9c9ef}.entry-icon{display:grid;place-items:center;width:52px;height:52px;border-radius:17px;background:var(--p2);color:var(--p);font-size:20px;font-weight:900}.entry-copy h2{margin:4px 0 6px;font-size:21px}.entry-copy p{margin:0;color:var(--muted);font-size:12px;line-height:1.5}.entry-number{text-align:right}.entry-number strong{display:block;font-size:29px}.entry-number span{color:var(--muted);font-size:11px}.workspace-metrics{grid-template-columns:repeat(3,1fr);margin-bottom:28px}.dashboard-columns{grid-template-columns:minmax(0,1.65fr) minmax(300px,.75fr)}.today-preview{display:flex;flex-direction:column;gap:12px}.today-course{display:grid;grid-template-columns:90px minmax(0,1fr) auto;align-items:center;gap:18px;padding:18px 20px;background:#fff;border:1px solid var(--line);border-radius:18px}.today-course.in_progress{border-color:#bda4e0;background:#fbf8ff}.today-course.completed{opacity:.75}.today-course.cancelled{opacity:.55}.course-time strong,.course-time span{display:block}.course-time strong{font-size:20px}.course-time span{color:var(--muted);font-size:12px;margin-top:4px}.course-title-line{display:flex;align-items:center;gap:10px}.course-title-line h3{margin:0;font-size:18px}.course-main p{margin:6px 0 0;color:var(--muted);font-size:12px}.course-type{display:inline-flex;padding:4px 8px;border-radius:999px;background:var(--p2);color:var(--p);font-size:11px;font-weight:700}.course-action form,.schedule-actions form,.compact-actions form{margin:0}.class-shortcuts{margin-top:30px}.page-title-row{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;margin-bottom:20px}.page-title-row h1{font-size:32px;margin:5px 0 7px}.page-title-row p{margin:0;color:var(--muted)}.date-switcher{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:18px;padding:15px 18px}.date-switcher form{display:flex;gap:9px;align-items:center}.date-switcher input{width:auto}.date-current{font-weight:800}.today-schedule-list{display:flex;flex-direction:column;gap:12px}.schedule-row{display:grid;grid-template-columns:90px 2px minmax(0,1fr) auto;align-items:center;gap:20px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:0 8px 24px rgba(50,31,70,.04)}.schedule-row.in_progress{border-color:#b89ddd;background:#fbf9ff}.schedule-row.completed{opacity:.78}.schedule-row.cancelled{opacity:.55}.schedule-time strong,.schedule-time span{display:block}.schedule-time strong{font-size:23px}.schedule-time span{margin-top:5px;color:var(--muted);font-size:12px}.schedule-divider{width:2px;height:55px;background:var(--p2);border-radius:99px}.schedule-title{display:flex;align-items:center;gap:10px}.schedule-title h2{margin:0;font-size:20px}.schedule-body p{margin:7px 0;color:var(--muted);font-size:12px}.schedule-actions{display:flex;align-items:center;justify-content:flex-end;gap:8px;flex-wrap:wrap}.status-pill{display:inline-flex;padding:5px 9px;border-radius:999px;font-size:11px;font-weight:700;background:#eee;color:#666}.status-pill.progress,.status-pill.in_progress{background:#f2eaff;color:#6f42c1}.status-pill.completed{background:#dcfae6;color:var(--ok)}.status-pill.cancelled{background:#eee;color:#666}.status-pill.scheduled{background:#eef4ff;color:#315ca8}.schedule-empty{margin-top:8px}.schedule-layout{display:grid;grid-template-columns:350px minmax(0,1fr);gap:20px;align-items:start}.schedule-create-card{position:sticky;top:82px}.schedule-create-card h2{margin:5px 0 16px}.segmented{display:grid;grid-template-columns:1fr 1fr;gap:8px}.segmented label{margin:0}.segmented input{position:absolute;opacity:0;pointer-events:none}.segmented span{display:block;text-align:center;padding:10px;border:1px solid var(--line);border-radius:10px;cursor:pointer}.segmented input:checked+span{background:var(--p2);border-color:#bda6dc;color:var(--p);font-weight:800}.form-two{display:grid;grid-template-columns:1fr 1fr;gap:10px}.schedule-submit{width:100%;justify-content:center;margin-top:16px}.schedule-table-card{padding:20px}.schedule-table-wrap{overflow:auto}.schedule-table td{min-width:90px}.schedule-table td:nth-child(3){min-width:190px}.compact-actions{gap:5px;flex-wrap:nowrap}.question-chart{display:flex;flex-direction:column;gap:18px}.question-bar-row{display:grid;grid-template-columns:110px minmax(0,1fr) 58px;gap:12px;align-items:center}.question-label{display:flex;justify-content:space-between;align-items:baseline;gap:8px}.question-label span{font-size:11px;color:var(--muted)}.question-track{height:17px;background:#eee9f2;border-radius:999px;overflow:hidden}.question-fill{height:100%;border-radius:999px;background:linear-gradient(90deg,#6f42c1,#9d78d7);min-width:2px}.question-percent{text-align:right;font-weight:800;color:var(--p)}.question-students{grid-column:2/4;color:var(--muted);font-size:11px;margin-top:-7px}.task-columns{grid-template-columns:minmax(0,1.7fr) 300px}.task-summary-card{position:sticky;top:82px}.task-summary-card h2{margin:5px 0 14px}.focus-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column}.focus-list li{display:flex;justify-content:space-between;padding:11px 0;border-bottom:1px solid var(--line)}.focus-list b{color:var(--p)}.task-metrics{grid-template-columns:repeat(3,1fr)}
@media(max-width:960px){.workspace-entry-grid{grid-template-columns:1fr}.dashboard-columns,.schedule-layout,.task-columns{grid-template-columns:1fr}.schedule-create-card,.task-summary-card{position:static}.navlinks a:nth-of-type(3),.navlinks a:nth-of-type(4){display:none}}@media(max-width:680px){.page-title-row,.date-switcher{align-items:stretch;flex-direction:column}.date-switcher form{align-items:stretch}.date-switcher input{width:100%}.workspace-metrics,.task-metrics{grid-template-columns:1fr}.today-course{grid-template-columns:70px minmax(0,1fr)}.course-action{grid-column:1/-1}.course-action .btn{width:100%;justify-content:center}.schedule-row{grid-template-columns:65px minmax(0,1fr);gap:12px}.schedule-divider{display:none}.schedule-actions{grid-column:1/-1;justify-content:stretch}.schedule-actions>*{flex:1}.schedule-actions .btn{width:100%;justify-content:center}.form-two{grid-template-columns:1fr}.question-bar-row{grid-template-columns:92px minmax(0,1fr) 45px}.question-students{grid-column:1/-1;margin-top:-4px}.workspace-entry{grid-template-columns:auto minmax(0,1fr)}.entry-number{grid-column:2;text-align:left;display:flex;align-items:baseline;gap:5px}.entry-number strong{font-size:23px}.navlinks a:nth-of-type(2){display:none}}
.account-divider{height:1px;background:var(--line);margin:24px 0}.account-group{border:1px solid var(--line);border-radius:12px;margin-top:10px;overflow:hidden}.account-group summary{cursor:pointer;padding:11px 12px;font-weight:750;background:#faf8fd}.account-list{display:flex;flex-direction:column}.account-row{display:grid;grid-template-columns:minmax(0,1fr) 76px 52px;gap:7px;align-items:center;padding:9px 10px;border-top:1px solid var(--line)}.account-row span strong,.account-row span small{display:block}.account-row span small{font-size:10px;color:var(--muted);margin-top:2px}.account-row input[type="number"]{padding:7px 8px}.account-empty{padding:12px}.schedule-create-card{max-height:calc(100vh - 100px);overflow:auto}

/* Homework OS 2.0.2 · Approved workspace UI */
:root{--ui-bg:#f7f5fb;--ui-surface:#fff;--ui-surface2:#fbf9ff;--ui-line:#e8e1f8;--ui-text:#241c36;--ui-muted:#7b7291;--ui-purple:#7254f3;--ui-purple2:#8d74ff;--ui-orange:#ffb25d;--ui-pink:#f4a7c2;--ui-shadow:0 18px 45px rgba(66,42,126,.10)}
body{background:radial-gradient(circle at 0 0,rgba(114,84,243,.11),transparent 28%),radial-gradient(circle at 100% 0,rgba(244,167,194,.10),transparent 24%),linear-gradient(180deg,#faf8ff,#f5f3fb);color:var(--ui-text)}
.wrap{width:min(1370px,91vw)}
.app-topbar{height:72px;padding:0;background:rgba(255,255,255,.88);border-bottom:1px solid rgba(114,84,243,.12);backdrop-filter:blur(14px);box-shadow:none}
.topbar-inner{height:72px}.brand-lockup{display:flex;align-items:center;gap:12px;color:var(--ui-text)}.brand-lockup>span:last-child{display:flex;flex-direction:column}.brand-lockup strong{font-size:20px;line-height:1.1}.brand-lockup small{margin-top:5px;font-size:11px;font-weight:500;color:var(--ui-muted)}
.brand-logo{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,var(--ui-purple),var(--ui-purple2));box-shadow:0 10px 25px rgba(114,84,243,.27);position:relative;flex:none}.brand-logo i{position:absolute;left:10px;height:4px;background:#fff;border-radius:99px}.brand-logo i:first-child{top:12px;width:22px}.brand-logo i:last-child{top:22px;width:14px;opacity:.72}
.compact-nav{gap:12px}.workspace-label{font-size:12px;color:var(--ui-muted);font-weight:800}.logout-form{margin:0}.quiet-action{border:1px solid var(--ui-line);border-radius:11px;padding:8px 12px;background:#fff;color:var(--ui-muted);font:inherit;font-size:12px;font-weight:800;cursor:pointer}.quiet-action:hover{color:var(--ui-purple);border-color:rgba(114,84,243,.28)}
.page{padding:22px 0 60px}.flash{border:1px solid rgba(114,84,243,.14);background:#f4effd;color:#59369a}.flash.success{background:#edf9f1;border-color:#cee9d7;color:#247245}.flash.error{background:#fff0f0;border-color:#f2d0d0;color:#a43a3a}
.workspace-hero-refined{display:flex;align-items:center;justify-content:space-between;gap:28px;padding:31px 28px;background:rgba(255,255,255,.89);border:1px solid rgba(114,84,243,.10);border-radius:27px;color:var(--ui-text);box-shadow:var(--ui-shadow)}.workspace-hero-refined .eyebrow{color:var(--ui-purple)}.workspace-hero-refined h1{font-size:35px;margin:8px 0 9px}.workspace-hero-refined p{max-width:720px;color:var(--ui-muted);line-height:1.7}.workspace-welcome{min-width:0}
.workspace-hero-actions{display:flex;align-items:center;justify-content:flex-end;gap:10px;flex-wrap:wrap}.hero-action{min-width:126px;height:46px;padding:0 17px;border-radius:14px;display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid rgba(114,84,243,.16);background:rgba(255,255,255,.9);color:var(--ui-text);font-size:14px;font-weight:900;box-shadow:0 10px 25px rgba(66,42,126,.08);transition:.18s ease}.hero-action:hover{transform:translateY(-2px);border-color:rgba(114,84,243,.28);box-shadow:0 15px 30px rgba(66,42,126,.13)}.hero-action.primary{border-color:transparent;color:#fff;background:linear-gradient(135deg,var(--ui-purple),var(--ui-purple2));box-shadow:0 13px 28px rgba(114,84,243,.24)}.hero-action-icon{width:24px;height:24px;border-radius:8px;display:grid;place-items:center;background:rgba(114,84,243,.08);color:var(--ui-purple);font-size:12px;font-weight:950}.hero-action.primary .hero-action-icon{background:rgba(255,255,255,.18);color:#fff}
.workspace-home-metrics{grid-template-columns:repeat(3,1fr);gap:14px;margin:18px 0}.workspace-home-metrics .metric-card{padding:20px 28px;border:1px solid rgba(114,84,243,.10);border-radius:20px;box-shadow:0 12px 30px rgba(66,42,126,.07)}.workspace-home-metrics .metric-icon{background:var(--ui-surface2);color:var(--ui-purple)}
.refined-page-title{align-items:center;padding:26px 28px;background:rgba(255,255,255,.89);border:1px solid rgba(114,84,243,.10);border-radius:24px;box-shadow:var(--ui-shadow)}.refined-page-title h1{font-size:34px}.refined-page-title .actions{justify-content:flex-end}.btn{background:linear-gradient(135deg,var(--ui-purple),var(--ui-purple2));border-radius:12px;font-weight:850;box-shadow:0 9px 20px rgba(114,84,243,.18)}.btn.secondary{background:#fff;color:var(--ui-text);border:1px solid var(--ui-line);box-shadow:none}.btn.danger{box-shadow:none}
.card{border-color:rgba(114,84,243,.11);box-shadow:0 14px 34px rgba(66,42,126,.07)}
.refined-date-switcher{padding:16px 18px}.refined-date-switcher>div strong{display:block;margin-top:5px;font-size:18px}.refined-today-list{margin-top:14px}.refined-today-list .schedule-row{border-color:rgba(114,84,243,.11);box-shadow:0 12px 30px rgba(66,42,126,.07)}.course-type.one_to_one{background:rgba(114,84,243,.10);color:var(--ui-purple)}.course-type.class{background:rgba(255,178,93,.18);color:#a2641d}
.refined-schedule-layout{grid-template-columns:370px minmax(0,1fr)}.refined-control-card{border-radius:22px;box-shadow:var(--ui-shadow)}.refined-record-card{border-radius:22px}.schedule-record-list{display:flex;flex-direction:column;gap:10px}.schedule-record{display:grid;grid-template-columns:100px minmax(0,1fr) auto;gap:15px;align-items:center;padding:15px 16px;border:1px solid var(--ui-line);border-radius:16px;background:#fff}.schedule-record.in_progress{border-color:#c9b5ee;background:#fbf9ff}.schedule-record.cancelled{opacity:.58}.schedule-record.completed{opacity:.8}.record-date strong,.record-date span{display:block}.record-date strong{font-size:17px}.record-date span{margin-top:4px;color:var(--ui-muted);font-size:11px}.record-main{display:flex;align-items:center;justify-content:space-between;gap:12px}.record-main h3{margin:0;font-size:16px}.record-main p{margin:5px 0 0;color:var(--ui-muted);font-size:11px}.record-actions{display:flex;gap:6px}.record-actions form{margin:0}
.task-overview{padding:22px;border-radius:22px}.task-picker{display:grid;grid-template-columns:170px minmax(260px,620px);gap:12px;align-items:center}.task-picker label{margin:0;color:var(--ui-muted);font-size:12px}.task-picker select{border-color:var(--ui-line);border-radius:13px}.task-context{display:flex;justify-content:space-between;align-items:end;gap:16px;margin:22px 0 16px;padding-top:18px;border-top:1px solid var(--ui-line)}.task-context strong,.task-context span{display:block}.task-context strong{font-size:21px}.task-context span{margin-top:6px;color:var(--ui-muted);font-size:12px}.task-inline-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:24px}.task-inline-metrics>div{padding:16px;border-radius:15px;background:var(--ui-surface2);border:1px solid rgba(114,84,243,.08)}.task-inline-metrics strong,.task-inline-metrics span{display:block}.task-inline-metrics strong{font-size:24px}.task-inline-metrics span{margin-top:5px;color:var(--ui-muted);font-size:11px}.refined-chart{padding:4px 0}.question-fill{background:linear-gradient(90deg,var(--ui-purple),var(--ui-purple2))}.task-class-section{margin-top:24px}.task-empty{margin-top:20px}
@media(max-width:980px){.workspace-hero-refined{align-items:flex-start;flex-direction:column}.workspace-hero-actions{width:100%;justify-content:flex-start}.hero-action{flex:1}.refined-schedule-layout{grid-template-columns:1fr}.schedule-create-card{position:static;max-height:none}.schedule-record{grid-template-columns:80px minmax(0,1fr)}.record-actions{grid-column:1/-1;justify-content:flex-end}}
@media(max-width:700px){.workspace-home-metrics,.task-inline-metrics{grid-template-columns:1fr}.workspace-hero-refined h1{font-size:28px}.hero-action{min-width:145px}.refined-page-title{align-items:flex-start;flex-direction:column}.refined-page-title .actions{width:100%}.refined-page-title .actions .btn{flex:1;justify-content:center}.task-picker{grid-template-columns:1fr}.task-context{align-items:flex-start;flex-direction:column}.schedule-record{grid-template-columns:1fr}.record-main{align-items:flex-start;flex-direction:column}.record-actions{grid-column:auto;justify-content:flex-start}.workspace-label{display:none}}


/* Homework OS 2.0.4 · account issuance and visible scheduling */
.account-hero{display:flex;align-items:flex-end;justify-content:space-between;gap:22px;background:rgba(255,255,255,.9);border:1px solid rgba(114,84,243,.10);border-radius:26px;padding:25px 27px;box-shadow:var(--shadow);margin-bottom:18px}.account-hero h1{font-size:34px;margin:7px 0 8px}.account-hero p{margin:0;color:var(--muted);line-height:1.65;max-width:760px}.account-layout{display:grid;grid-template-columns:390px 1fr;gap:18px}.account-tool-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:18px;margin-bottom:18px}.account-card{background:rgba(255,255,255,.92);border:1px solid rgba(114,84,243,.10);border-radius:22px;padding:20px;box-shadow:var(--shadow)}.account-card-head{display:flex;align-items:flex-start;justify-content:space-between;gap:10px;margin-bottom:16px}.account-card-head h2{margin:5px 0 0;font-size:21px}.account-count{padding:6px 10px;border-radius:999px;background:var(--surface-2);color:var(--purple);font-size:12px;font-weight:900}.account-form{display:grid;gap:13px}.account-form label{display:grid;gap:7px;font-size:12px;font-weight:850;color:var(--muted)}.account-form input,.account-form select,.compact-create input,.reset-form input{width:100%;min-height:43px;border:1px solid var(--line);border-radius:12px;padding:9px 11px;background:#fff;color:var(--text);outline:none}.account-form input:focus,.account-form select:focus,.compact-create input:focus,.reset-form input:focus{border-color:rgba(114,84,243,.45);box-shadow:0 0 0 4px rgba(114,84,243,.08)}.identity-input{display:grid;grid-template-columns:1fr auto;gap:8px}.account-submit{width:100%;margin-top:3px}.account-tip{margin-top:14px;border-radius:13px;background:var(--surface-2);padding:11px 12px;color:var(--muted);font-size:12px;line-height:1.6}.account-list{display:grid;gap:10px}.account-row-card{display:grid;grid-template-columns:46px minmax(180px,1fr) auto;align-items:center;gap:12px;border:1px solid var(--line);border-radius:16px;padding:12px;background:#fff}.identity-avatar{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,rgba(114,84,243,.14),rgba(141,116,255,.22));display:grid;place-items:center;color:var(--purple);font-weight:950}.account-main{display:grid;gap:4px}.account-main strong,.student-code-card strong{font-size:15px}.account-main small,.student-code-card small{color:var(--muted);font-size:11px}.copy-code{width:max-content;border:0;background:transparent;color:var(--purple);padding:0;font-size:12px;font-weight:900;cursor:pointer}.account-actions{display:flex;align-items:center;justify-content:flex-end;gap:7px;flex-wrap:wrap}.reset-form{display:flex;gap:6px}.reset-form input{width:118px;min-height:35px}.compact-create{display:grid;grid-template-columns:1fr auto;gap:9px;margin-bottom:14px}.class-manage-list{display:grid;gap:8px}.class-manage-row{display:flex;justify-content:space-between;align-items:center;gap:10px;border:1px solid var(--line);border-radius:14px;padding:11px 12px;background:#fff}.class-manage-row strong,.class-manage-row small{display:block}.class-manage-row small{margin-top:3px;color:var(--muted);font-size:11px}.class-manage-row b{color:var(--purple);font-size:12px}.account-student-list{margin-bottom:24px}.student-code-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.student-code-card{display:grid;grid-template-columns:42px 1fr;align-items:center;gap:11px;border:1px solid var(--line);border-radius:15px;padding:12px;background:#fff}.student-code-card>div:last-child{display:grid;gap:4px}.account-empty{padding:24px 12px}.quiet-home-admin{margin-left:3px;background:transparent!important;border-color:transparent!important;color:var(--muted)!important;box-shadow:none!important}.workspace-hero-actions{grid-template-columns:repeat(4,minmax(112px,1fr))}.workspace-label{text-decoration:none}.workspace-label:hover{color:var(--purple)}
@media(max-width:1050px){.account-layout,.account-tool-grid{grid-template-columns:1fr}.student-code-grid{grid-template-columns:repeat(2,1fr)}.account-row-card{grid-template-columns:46px 1fr}.account-actions{grid-column:1/-1;justify-content:flex-start}.workspace-hero-actions{grid-template-columns:repeat(2,minmax(120px,1fr))}}
@media(max-width:650px){.account-hero{align-items:flex-start;flex-direction:column}.student-code-grid{grid-template-columns:1fr}.identity-input,.compact-create{grid-template-columns:1fr}.reset-form{width:100%}.reset-form input{width:100%}}

/* Homework OS 2.0.5 · simplified account center */
.account-center-hero{align-items:center}.account-choice-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.account-choice-card{min-height:220px;display:grid;grid-template-columns:58px 1fr auto;align-items:center;gap:18px;padding:28px;border:1px solid rgba(114,84,243,.11);border-radius:24px;background:rgba(255,255,255,.92);box-shadow:var(--shadow);color:var(--text);transition:.18s}.account-choice-card:hover{transform:translateY(-3px);box-shadow:0 22px 48px rgba(66,42,126,.12)}.account-choice-icon{width:56px;height:56px;border-radius:18px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(114,84,243,.14),rgba(141,116,255,.22));color:var(--purple);font-size:19px;font-weight:950}.account-choice-card h2{margin:6px 0 8px;font-size:25px}.account-choice-card p{margin:0;color:var(--muted);line-height:1.65}.account-choice-card>b{color:var(--purple);font-size:13px;white-space:nowrap}.account-edit-row{grid-template-columns:46px minmax(0,1fr);align-items:start}.account-edit-form{display:grid;grid-template-columns:1fr 1fr minmax(160px,.85fr) auto;gap:8px;align-items:center}.account-edit-form input{min-height:38px;border:1px solid var(--line);border-radius:11px;padding:8px 10px}.student-edit-form{grid-template-columns:1fr 130px auto}.account-edit-row>.account-actions{grid-column:2;justify-content:flex-start}.teacher-student-layout{grid-template-columns:360px 1fr}.teacher-student-grid{grid-template-columns:repeat(2,1fr)}
@media(max-width:980px){.account-choice-grid,.teacher-student-layout{grid-template-columns:1fr}.account-edit-form,.student-edit-form{grid-template-columns:1fr 1fr}.account-edit-form .btn{grid-column:1/-1}.teacher-student-grid{grid-template-columns:1fr}}
@media(max-width:650px){.account-choice-card{grid-template-columns:48px 1fr}.account-choice-card>b{grid-column:2}.account-edit-form,.student-edit-form{grid-template-columns:1fr}.account-edit-row>.account-actions{grid-column:1/-1}}

/* Homework OS 2.0.9 · reliable global navigation */
.global-page-actions{display:flex;align-items:center;justify-content:flex-end;gap:8px}.top-action{min-height:38px;border:1px solid var(--ui-line,var(--line));border-radius:12px;padding:8px 12px;background:#fff;color:var(--ui-text,var(--text));font:inherit;font-size:12px;font-weight:850;display:inline-flex;align-items:center;justify-content:center;gap:6px;text-decoration:none;cursor:pointer;box-shadow:none}.top-action:hover{border-color:rgba(114,84,243,.30);color:var(--ui-purple,var(--purple));background:#fbf9ff}.top-action-icon{width:38px;padding:0;font-size:19px}.top-home-icon{font-size:15px;color:var(--ui-purple,var(--purple))}.top-logout{color:var(--ui-muted,var(--muted))}.logout-form{margin:0}@media(max-width:700px){.global-page-actions{gap:5px}.top-action{padding:8px}.top-action span:last-child{display:none}.top-action-icon{display:inline-flex!important}}


/* Homework OS 2.0.10 · automatic mobile layout */
@media(max-width:760px){
  html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
  body{padding-bottom:env(safe-area-inset-bottom);background:#f8f6fb}
  .wrap{width:calc(100% - 24px)}
  .page{padding:14px 0 36px}
  input,select,textarea{font-size:16px}
  .nav{padding:8px 0}
  .topbar-inner{height:54px;gap:8px}
  .brand-lockup{gap:8px;min-width:0}
  .brand-logo{width:34px;height:34px;border-radius:11px}
  .brand-logo i{left:8px;height:3px}.brand-logo i:first-child{top:10px;width:18px}.brand-logo i:last-child{top:19px;width:12px}
  .brand-lockup strong{font-size:15px;white-space:nowrap}.brand-lockup small{font-size:9px;margin-top:2px}
  .global-page-actions{gap:4px}.top-action{width:36px;min-height:36px;padding:0;border-radius:10px}.top-action-icon{font-size:18px}
  .top-action span:last-child{display:none}.top-logout{font-size:0}.top-logout:before{content:"退";font-size:12px}
  .hero,.card{border-radius:16px}.card{padding:16px}
  .workspace-hero-refined{padding:20px 17px;border-radius:20px;gap:18px}
  .workspace-hero-refined h1{font-size:25px;margin:6px 0 8px}.workspace-hero-refined p{font-size:12px;line-height:1.6}
  .workspace-hero-actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));width:100%;gap:8px}
  .hero-action{min-width:0;width:100%;height:43px;padding:0 10px;border-radius:12px;font-size:13px}
  .workspace-home-metrics{grid-template-columns:repeat(3,minmax(0,1fr));gap:7px}
  .workspace-home-metrics .metric-card{padding:12px 8px;gap:8px;min-width:0;border-radius:14px;flex-direction:column;text-align:center}
  .workspace-home-metrics .metric-icon{width:34px;height:34px;flex-basis:34px;border-radius:11px}
  .workspace-home-metrics .metric-card strong{font-size:21px}.workspace-home-metrics .metric-card div span{font-size:10px;margin-top:4px}
  .refined-page-title{margin-bottom:12px}.refined-page-title h1{font-size:27px}.refined-page-title p{font-size:12px;line-height:1.55}
  .refined-date-switcher{padding:14px;display:grid;gap:12px}.refined-date-switcher form{display:grid;grid-template-columns:1fr auto;gap:8px;width:100%}.refined-date-switcher .btn{justify-content:center}
  .refined-today-list{gap:10px}.schedule-row{grid-template-columns:72px minmax(0,1fr);gap:12px;padding:15px;border-radius:16px}.schedule-divider{display:none}.schedule-time strong{font-size:20px}.schedule-title h2{font-size:18px}.schedule-actions{grid-column:1/-1;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));justify-content:stretch}.schedule-actions form,.schedule-actions a,.schedule-actions button{width:100%}.schedule-actions .btn{justify-content:center;min-height:42px}
  .section-head{align-items:flex-start;flex-direction:column;margin:18px 0 12px}.section-head .actions{width:100%}.section-head .actions .btn{flex:1;justify-content:center}
  .account-hero{padding:19px 17px;border-radius:20px}.account-hero h1{font-size:27px}.account-choice-grid{gap:10px}.account-choice-card{min-height:0;padding:17px;gap:12px;border-radius:18px}.account-choice-icon{width:44px;height:44px;border-radius:14px}.account-choice-card h2{font-size:20px}.account-choice-card p{font-size:12px}.account-layout{gap:12px}.account-card{padding:15px;border-radius:18px}.account-row-card{padding:11px;border-radius:14px}.account-edit-row{grid-template-columns:38px minmax(0,1fr)}.identity-avatar{width:38px;height:38px;border-radius:12px}.account-actions{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));width:100%}.account-actions form,.account-actions button{width:100%}.account-actions .badge{display:grid;place-items:center}.account-edit-form .btn{min-height:40px}
  .grid{grid-template-columns:1fr;gap:10px}.student-code-grid,.class-grid{grid-template-columns:1fr}.class-card{padding:16px;border-radius:17px}
  table.responsive-table,table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch}
  .task-overview{padding:16px}.task-context strong{font-size:18px}.task-inline-metrics{grid-template-columns:repeat(3,minmax(0,1fr));gap:7px}.task-inline-metrics>div{padding:11px 7px;text-align:center}.task-inline-metrics strong{font-size:20px}.question-bar-row{grid-template-columns:72px minmax(0,1fr) 45px;gap:7px}.question-students{grid-column:1/-1;margin-top:0;padding-left:79px}.question-label{font-size:12px}
  .login{margin:24px auto}.login .card{padding:22px 18px}.login .btn{width:100%;justify-content:center;min-height:44px}
}
@media(max-width:390px){
  .brand-lockup small{display:none}.workspace-home-metrics{grid-template-columns:1fr}.workspace-home-metrics .metric-card{flex-direction:row;text-align:left;padding:13px}.workspace-hero-actions{grid-template-columns:1fr 1fr}.hero-action{font-size:12px}.account-actions{grid-template-columns:1fr}.question-students{padding-left:0}
}

/* Homework OS 2.1.0 · feedback studios and explicit course creation */
.feedback-choice-hero,.create-course-hero{align-items:center}.feedback-choice-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:18px}.feedback-choice-card{min-height:230px;display:grid;grid-template-columns:72px minmax(0,1fr) auto;align-items:center;gap:20px;padding:30px;border:1px solid var(--line);border-radius:26px;background:#fff;color:var(--ink);box-shadow:0 16px 40px rgba(50,31,70,.07);transition:.18s ease}.feedback-choice-card:hover{transform:translateY(-3px);box-shadow:0 24px 54px rgba(50,31,70,.13)}.feedback-choice-card.class{background:linear-gradient(135deg,#fff9f4,#fff)}.feedback-choice-icon{width:68px;height:68px;border-radius:22px;display:grid;place-items:center;background:linear-gradient(135deg,#ede5ff,#d9c8ff);color:var(--p);font-size:18px;font-weight:950}.feedback-choice-card.class .feedback-choice-icon{background:linear-gradient(135deg,#fff0dc,#ffe0bd);color:#a65d13}.feedback-choice-card small{font-size:10px;font-weight:900;letter-spacing:.14em;color:var(--muted)}.feedback-choice-card h2{margin:7px 0 9px;font-size:27px}.feedback-choice-card p{margin:0;color:var(--muted);line-height:1.7}.feedback-choice-card>b{font-size:13px;color:var(--p);white-space:nowrap}.feedback-frame-head{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:12px}.feedback-frame-head h1{margin:5px 0 4px;font-size:27px}.feedback-frame-head p{margin:0;color:var(--muted)}.feedback-frame-actions{display:flex;align-items:center;gap:8px}.feedback-frame-actions form{margin:0}.feedback-studio-shell{position:relative;display:flex;align-items:flex-start;justify-content:center;width:calc(100vw - 24px);margin-left:calc(50% - 50vw + 12px);height:calc(100vh - 150px);min-height:680px;padding:6px;border:1px solid var(--line);border-radius:22px;overflow:hidden;background:#ece9f3;box-shadow:0 18px 48px rgba(50,31,70,.10)}.feedback-studio-stage{position:relative;flex:none;overflow:visible}.feedback-studio-frame{position:absolute;left:0;top:0;display:block;border:0;background:#f7f5fb;transform-origin:top left}.course-create-layout{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(300px,.65fr);gap:18px;margin-top:18px;align-items:start}.course-create-card,.created-course-card{padding:24px;border:1px solid var(--line);border-radius:24px;background:#fff;box-shadow:0 14px 38px rgba(50,31,70,.06)}.course-type-switch{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:20px}.course-type-switch label{margin:0;cursor:pointer}.course-type-switch input{position:absolute;opacity:0;pointer-events:none}.course-type-switch span{min-height:100px;display:grid;grid-template-columns:48px 1fr;grid-template-rows:auto auto;align-items:center;column-gap:12px;padding:17px;border:1px solid var(--line);border-radius:18px;background:#fff;transition:.16s}.course-type-switch b{grid-row:1/3;width:46px;height:46px;border-radius:15px;display:grid;place-items:center;background:var(--p2);color:var(--p)}.course-type-switch strong{font-size:18px}.course-type-switch small{color:var(--muted);font-weight:500}.course-type-switch input:checked+span{border-color:#ad91d8;background:#f8f3ff;box-shadow:0 0 0 4px rgba(111,66,193,.07)}.course-form-section{display:grid;gap:13px}.course-form-section label{margin:0}.course-form-section label>small{float:right;color:var(--muted);font-weight:500}.course-form-section textarea{min-height:110px}.class-member-picker{border:1px solid var(--line);border-radius:17px;padding:14px;background:#fbf9ff}.member-picker-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.member-picker-head small{color:var(--muted)}.member-check-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;max-height:260px;overflow:auto}.member-check-grid label{margin:0;display:flex;align-items:center;gap:9px;padding:10px;border:1px solid var(--line);border-radius:13px;background:#fff;cursor:pointer}.member-check-grid input{width:auto}.member-check-grid span b,.member-check-grid span small{display:block}.member-check-grid span small{margin-top:2px;color:var(--muted);font-size:10px}.course-create-submit{width:100%;justify-content:center;min-height:48px;margin-top:18px}.created-course-card{position:sticky;top:86px}.created-course-head{display:flex;align-items:end;justify-content:space-between;margin-bottom:14px}.created-course-head h2{margin:5px 0 0}.created-course-head>b{font-size:28px;color:var(--p)}.created-course-list{display:grid;gap:9px;max-height:620px;overflow:auto}.created-course-list article{display:grid;grid-template-columns:52px 1fr;align-items:center;gap:11px;padding:12px;border:1px solid var(--line);border-radius:15px}.created-course-list article strong,.created-course-list article small{display:block}.created-course-list article small{margin-top:3px;color:var(--muted);font-size:11px}.course-type-badge{display:grid;place-items:center;height:38px;border-radius:12px;background:#f1eaff;color:var(--p);font-size:11px;font-weight:950}.course-type-badge.class{background:#fff0df;color:#a65d13}
@media(max-width:900px){.feedback-choice-grid,.course-create-layout{grid-template-columns:1fr}.created-course-card{position:static}.feedback-studio-shell{height:calc(100vh - 145px);min-height:620px}.feedback-frame-head{align-items:flex-start;flex-direction:column}.feedback-frame-actions{width:100%}.feedback-frame-actions .btn,.feedback-frame-actions form{flex:1}.feedback-frame-actions button{width:100%;justify-content:center}}
@media(max-width:650px){.feedback-choice-card{grid-template-columns:52px 1fr;min-height:0;padding:18px;border-radius:19px}.feedback-choice-card>b{grid-column:2}.feedback-choice-icon{width:50px;height:50px;border-radius:16px;font-size:14px}.feedback-choice-card h2{font-size:21px}.feedback-choice-card p{font-size:12px}.feedback-frame-head{margin-bottom:9px}.feedback-frame-head h1{font-size:23px}.feedback-frame-actions{display:grid;grid-template-columns:1fr 1fr}.feedback-studio-shell{width:100vw;margin-left:calc(50% - 50vw);height:calc(100vh - 150px);min-height:560px;padding:4px;border-radius:0;border-left:0;border-right:0}.course-create-card,.created-course-card{padding:16px;border-radius:19px}.course-type-switch{gap:8px}.course-type-switch span{min-height:84px;grid-template-columns:39px 1fr;padding:12px}.course-type-switch b{width:38px;height:38px;border-radius:12px}.member-check-grid{grid-template-columns:1fr}}

/* 2.1.3 · A4 landscape feedback viewport */
.feedback-studio-shell{
  width:calc(100vw - 24px);
  height:auto;
  min-height:0;
  aspect-ratio:297/210;
  margin-left:calc(50% - 50vw + 12px);
  padding:6px;
  align-items:center;
  justify-content:center;
}
.feedback-studio-stage{position:relative;flex:none;overflow:hidden}
.feedback-studio-frame{transform-origin:top left}


/* 2.1.3 · clearer one-to-one / class creation modes */
.course-mode-heading{margin-bottom:14px}
.course-mode-heading h2{margin:4px 0 5px;font-size:22px}
.course-mode-heading p{margin:0;color:var(--muted);font-size:13px;line-height:1.65}
.course-type-switch{gap:14px}
.course-type-switch .course-mode-option span{
  min-height:122px;
  grid-template-columns:58px 1fr;
  padding:20px;
  border-width:2px;
}
.course-type-switch .course-mode-option b{width:56px;height:56px;border-radius:18px;font-size:13px}
.course-type-switch .course-mode-option strong{font-size:20px}
.course-type-switch .course-mode-option small{font-size:12px;line-height:1.55}
.course-type-switch .course-mode-option.one-to-one span{background:linear-gradient(145deg,#fbf8ff,#fff);border-color:#e2d7fb}
.course-type-switch .course-mode-option.one-to-one b{background:linear-gradient(135deg,#7254f3,#9a84ff);color:#fff}
.course-type-switch .course-mode-option.class-course span{background:linear-gradient(145deg,#fff9f2,#fff);border-color:#f5dbc1}
.course-type-switch .course-mode-option.class-course b{background:linear-gradient(135deg,#ffae55,#ffca86);color:#60370e}
.course-type-switch .course-mode-option.one-to-one input:checked+span{border-color:#7254f3;background:linear-gradient(145deg,#f4efff,#fff);box-shadow:0 0 0 5px rgba(114,84,243,.10),0 14px 30px rgba(114,84,243,.10)}
.course-type-switch .course-mode-option.class-course input:checked+span{border-color:#e9953e;background:linear-gradient(145deg,#fff2df,#fff);box-shadow:0 0 0 5px rgba(233,149,62,.11),0 14px 30px rgba(233,149,62,.10)}
.course-mode-status{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:0 0 16px;padding:12px 14px;border-radius:14px;font-size:13px}
.course-mode-status strong{font-size:14px}.course-mode-status span{color:var(--muted)}
.course-mode-status.one-to-one{background:#f3eeff;border:1px solid #ddcffb;color:#6544d9}
.course-mode-status.class-course{background:#fff1df;border:1px solid #f2d2ad;color:#a45a0e}
.course-form-section{border-radius:20px;padding:18px}
.course-form-section.one-to-one-section{border:1px solid #e0d4fb;background:linear-gradient(180deg,#fcfaff,#fff)}
.course-form-section.class-section{border:1px solid #f2d4b3;background:linear-gradient(180deg,#fffaf4,#fff)}
.course-section-title{display:flex;align-items:center;gap:12px;margin-bottom:2px;padding-bottom:13px;border-bottom:1px solid var(--line)}
.course-section-title>b{width:46px;height:42px;display:grid;place-items:center;border-radius:13px;background:#7254f3;color:#fff;font-size:12px}
.class-section .course-section-title>b{background:#f0a04b;color:#5c340d}
.course-section-title strong,.course-section-title small{display:block}.course-section-title strong{font-size:17px}.course-section-title small{margin-top:3px;color:var(--muted);font-size:11px}
.created-course-legend{display:flex;gap:7px;margin:-5px 0 13px}.created-course-legend span{padding:5px 9px;border-radius:999px;font-size:10px;font-weight:900}.created-course-legend .one{background:#f1eaff;color:#6544d9}.created-course-legend .group{background:#fff0df;color:#a65d13}
.created-course-list article.one_to_one{border-left:4px solid #7254f3}.created-course-list article.class{border-left:4px solid #eda052}

@media(max-width:900px){
  .feedback-studio-shell{width:100vw;margin-left:calc(50% - 50vw);border-radius:0;border-left:0;border-right:0}
  .course-type-switch .course-mode-option span{min-height:108px;padding:15px;grid-template-columns:48px 1fr}
  .course-type-switch .course-mode-option b{width:46px;height:46px;border-radius:15px}
  .course-type-switch .course-mode-option strong{font-size:17px}
}
@media(max-width:650px){
  .course-type-switch{grid-template-columns:1fr}
  .course-type-switch .course-mode-option span{min-height:92px}
  .course-mode-status{align-items:flex-start;flex-direction:column;gap:3px}
}


/* 2.1.4 · single-mode class creation */
.course-create-choice-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:18px}
.course-create-choice{min-height:210px;display:grid;grid-template-columns:72px minmax(0,1fr) auto;align-items:center;gap:20px;padding:28px;border:2px solid var(--line);border-radius:26px;background:#fff;color:var(--ink);box-shadow:0 16px 42px rgba(50,31,70,.07);transition:.18s ease}
.course-create-choice:hover{transform:translateY(-3px);box-shadow:0 24px 54px rgba(50,31,70,.13)}
.course-create-choice.one-to-one{background:linear-gradient(145deg,#f8f3ff,#fff);border-color:#ddd0fb}.course-create-choice.class-course{background:linear-gradient(145deg,#fff7ed,#fff);border-color:#f0d2b0}
.course-choice-icon{width:68px;height:68px;border-radius:21px;display:grid;place-items:center;background:linear-gradient(135deg,#7254f3,#9a84ff);color:#fff;font-weight:950}.class-course .course-choice-icon{background:linear-gradient(135deg,#ffae55,#ffca86);color:#60370e}
.course-create-choice small{font-size:10px;letter-spacing:.13em;color:var(--muted);font-weight:900}.course-create-choice h2{margin:7px 0 9px;font-size:25px}.course-create-choice p{margin:0;color:var(--muted);font-size:13px;line-height:1.65}.course-create-choice>b{white-space:nowrap;color:var(--p)}
.single-mode-layout .course-create-card.one_to_one,.single-mode-layout .created-course-card.one_to_one{border-top:4px solid #7254f3}.single-mode-layout .course-create-card.class,.single-mode-layout .created-course-card.class{border-top:4px solid #eda052}
.class-submit{background:linear-gradient(135deg,#e9953e,#ffb968);color:#5d350d}
.course-form-section[hidden],#oneStudentNameField[hidden]{display:none!important}

/* 2.1.4 · feedback editor always fits an A4 landscape viewport */
.feedback-frame-head{width:100%;max-width:100%}
.feedback-studio-shell{width:100%;height:auto;min-width:0;min-height:0;max-width:100%;aspect-ratio:297/210;margin-left:auto;margin-right:auto;padding:6px;align-items:center;justify-content:center;contain:layout paint}
.feedback-studio-stage{position:relative;flex:none;overflow:hidden;max-width:100%;max-height:100%}
.feedback-studio-frame{transform-origin:top left;max-width:none!important}

/* 2.1.4 · global browser-window responsiveness */
html,body{width:100%;max-width:100%;min-width:0;overflow-x:hidden}
body{min-height:var(--app-viewport-height,100vh)}
.wrap{width:min(1120px,calc(100vw - 32px));max-width:100%;min-width:0}
.page{min-width:0}.page>.wrap{min-width:0}.page>.wrap>*{min-width:0}
input,select,textarea,button{max-width:100%;min-width:0}
img,video,canvas,svg{max-width:100%}
.global-page-actions,.actions,.row{min-width:0;flex-wrap:wrap}
.card,.hero,.workspace-hero,.workspace-section,.course-create-card,.created-course-card{max-width:100%;min-width:0}
.feedback-choice-grid,.course-create-layout,.workspace-columns,.dashboard-columns,.metric-grid,.quick-grid,.class-grid{min-width:0}
@media(max-width:900px){.course-create-choice-grid{grid-template-columns:1fr}.course-create-choice{min-height:0}.single-mode-layout{grid-template-columns:1fr}.feedback-studio-shell{width:100vw;max-width:100vw;margin-left:calc(50% - 50vw);margin-right:0;border-left:0;border-right:0;border-radius:0}}
@media(max-width:650px){.wrap{width:min(100% - 20px,1120px)}.page{padding-top:16px}.nav .wrap{gap:10px}.global-page-actions{justify-content:flex-end;gap:6px}.top-action{padding:8px 10px}.top-action span:not(.top-home-icon){display:none}.course-create-choice{grid-template-columns:52px minmax(0,1fr);padding:18px;border-radius:20px}.course-create-choice>b{grid-column:2}.course-choice-icon{width:50px;height:50px;border-radius:15px}.course-create-choice h2{font-size:21px}.feedback-frame-actions{grid-template-columns:1fr 1fr}.feedback-studio-shell{padding:3px}}


/* 2.1.5 · full-browser feedback workspace */
body.feedback-workspace-page{height:var(--app-viewport-height,100vh);overflow:hidden}
body.feedback-workspace-page .nav{padding:8px 0}
body.feedback-workspace-page .page{height:calc(var(--app-viewport-height,100vh) - 58px);padding:8px 0 0;overflow:hidden}
body.feedback-workspace-page .page>.wrap{width:100%;max-width:none;padding:0 12px;height:100%;display:flex;flex-direction:column;min-height:0}
.feedback-page-root{width:100%;height:100%;min-height:0;display:flex;flex-direction:column}
body.feedback-workspace-page .feedback-frame-head{flex:none;min-height:58px;margin:0 0 7px;padding:0 4px;align-items:center}
body.feedback-workspace-page .feedback-frame-head .eyebrow{font-size:9px}
body.feedback-workspace-page .feedback-frame-head h1{margin:2px 0 1px;font-size:23px}
body.feedback-workspace-page .feedback-frame-head p{font-size:12px;line-height:1.3}
body.feedback-workspace-page .feedback-studio-shell{flex:1;width:100%;height:auto;min-height:260px;max-width:none;aspect-ratio:auto;margin:0;padding:6px;border-radius:18px;align-items:center;justify-content:center;overflow:hidden;contain:none}
body.feedback-workspace-page .feedback-studio-stage{max-width:none;max-height:none;overflow:hidden}
body.feedback-workspace-page .feedback-studio-frame{max-width:none!important;max-height:none!important}
@media(max-width:900px){
  body.feedback-workspace-page .page{height:calc(var(--app-viewport-height,100vh) - 54px);padding-top:5px}
  body.feedback-workspace-page .page>.wrap{width:100%;padding:0 6px}
  body.feedback-workspace-page .feedback-frame-head{min-height:0;gap:6px;margin-bottom:5px;display:grid;grid-template-columns:minmax(0,1fr) auto}
  body.feedback-workspace-page .feedback-frame-head>div:first-child p{display:none}
  body.feedback-workspace-page .feedback-frame-actions{width:auto;display:flex}
  body.feedback-workspace-page .feedback-frame-actions .btn{padding:8px 10px;font-size:12px}
  body.feedback-workspace-page .feedback-frame-actions form{display:none}
  body.feedback-workspace-page .feedback-studio-shell{width:100%;margin:0;border:1px solid var(--line);border-radius:13px;padding:3px}
}
@media(max-width:650px){
  body.feedback-workspace-page .nav{padding:5px 0}
  body.feedback-workspace-page .page{height:calc(var(--app-viewport-height,100vh) - 46px);padding-top:3px}
  body.feedback-workspace-page .page>.wrap{padding:0 2px}
  body.feedback-workspace-page .feedback-frame-head{grid-template-columns:1fr;align-items:start;padding:0 5px}
  body.feedback-workspace-page .feedback-frame-head .eyebrow{display:none}
  body.feedback-workspace-page .feedback-frame-head h1{font-size:18px}
  body.feedback-workspace-page .feedback-frame-actions{display:grid;grid-template-columns:1fr 1fr;width:100%}
  body.feedback-workspace-page .feedback-frame-actions .btn{min-height:34px}
  body.feedback-workspace-page .feedback-studio-shell{border-left:0;border-right:0;border-radius:0}
}


/* 2.1.9 · 班级管理列表 */
.class-management-head,.class-detail-head{align-items:center}
.class-management-list{display:grid;gap:10px}
.class-list-head,.class-list-row{display:grid;grid-template-columns:120px minmax(220px,1.5fr) 110px 130px 110px 90px;align-items:center;gap:14px}
.class-list-head{padding:0 18px;color:var(--muted);font-size:12px;font-weight:900;letter-spacing:.08em}
.class-list-row{position:relative;background:rgba(255,255,255,.95);border:1px solid var(--line);border-radius:18px;padding:16px 18px;box-shadow:0 12px 34px rgba(73,51,130,.07);overflow:hidden}
.class-list-row::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:#7254f3}.class-list-row.group-class::before{background:#ff9f52}.class-list-row.archived{opacity:.62}
.class-type-chip{display:inline-flex;padding:7px 11px;border-radius:999px;background:#f2edff;color:#6b48e8;font-weight:900;font-size:13px}.group-class .class-type-chip{background:#fff2e5;color:#dd741f}
.class-list-name{display:grid;gap:4px;min-width:0}.class-list-name strong{font-size:18px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.class-list-name small,.class-list-metric small{color:var(--muted)}
.class-list-metric{display:flex;align-items:baseline;gap:4px}.class-list-metric small{display:none}.class-list-metric b{font-size:20px}.class-list-metric span{font-size:12px;color:var(--muted)}
.class-list-status .status-pill.active{background:#edf9f1;color:#23824b}.class-list-action{display:flex;justify-content:flex-end}.class-management-empty{width:100%}
.btn.full{width:100%;justify-content:center}
.class-detail-grid{display:grid;grid-template-columns:minmax(300px,.85fr) minmax(420px,1.35fr);gap:20px}.stack-form{display:grid;gap:10px}.stack-form select,.stack-form input{width:100%}.notice-soft{padding:16px;border-radius:16px;background:#f6f2ff;color:#674f9e;line-height:1.7}
.member-list-clean{display:grid;gap:10px}.member-row-clean{display:flex;justify-content:space-between;align-items:center;gap:14px;padding:13px 14px;border:1px solid var(--line);border-radius:15px;background:#fbfaff}.member-row-clean div{display:grid;gap:3px}.member-row-clean span{font-size:13px;color:var(--muted)}
.class-settings-card{margin-top:20px}.class-settings-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}.danger-zone{padding:18px;border-radius:18px;border:1px solid #ffd7d7;background:#fff8f8}.danger-zone p{color:var(--muted);line-height:1.7}
@media(max-width:980px){.class-list-head{display:none}.class-list-row{grid-template-columns:110px minmax(0,1fr) 90px 105px 90px 76px}.class-detail-grid,.class-settings-grid{grid-template-columns:1fr}}
@media(max-width:700px){.class-management-head,.class-detail-head{align-items:flex-start}.class-management-head{gap:14px}.class-management-head .btn{width:100%;justify-content:center}.class-list-row{grid-template-columns:auto 1fr auto;padding:15px 15px 15px 18px;gap:10px 12px}.class-list-type{grid-column:1}.class-list-name{grid-column:2}.class-list-status{grid-column:3;grid-row:1}.class-list-metric{grid-row:2;padding:10px 12px;border-radius:12px;background:#f8f6ff}.class-list-metric:nth-of-type(3){grid-column:1/2}.class-list-metric:nth-of-type(4){grid-column:2/3}.class-list-metric small{display:inline}.class-list-action{grid-column:3;grid-row:2}.class-list-action .btn{min-height:40px}.member-row-clean{align-items:flex-start}}

/* 2.1.9 · mobile encoding and text-rendering hardening */
html{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}
body{word-break:normal;overflow-wrap:anywhere}
.feedback-scale-badge{display:none!important}
@supports(-webkit-touch-callout:none){input,select,textarea,button{font-family:inherit}}

/* 2.1.10 · 学生账号同步剩余课时 */
.student-balance-card{grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:14px}
.student-code-main{min-width:0;display:flex;flex-direction:column;gap:4px}
.student-balance-form{display:flex;align-items:end;gap:8px;padding-left:14px;border-left:1px solid var(--line)}
.student-balance-form label{display:grid;gap:5px;font-size:11px;color:var(--muted);font-weight:850;white-space:nowrap}
.student-balance-form input{width:92px;height:38px;border:1px solid var(--line);border-radius:11px;padding:0 10px;background:#fbfaff;color:var(--ink);font-weight:900;text-align:center}
.student-balance-form .btn{height:38px;padding:0 13px}
@media(max-width:760px){
  .student-balance-card{grid-template-columns:auto minmax(0,1fr);align-items:start}
  .student-balance-form{grid-column:1/-1;width:100%;padding:12px 0 0;border-left:0;border-top:1px solid var(--line);align-items:end}
  .student-balance-form label{flex:1}
  .student-balance-form input{width:100%}
  .student-balance-form .btn{min-width:84px}
}
.readonly-field{min-height:46px;padding:12px 14px;border:1px solid var(--line,#ddd6f3);border-radius:12px;background:#f7f4ff;font-weight:800;display:flex;align-items:center}.assignment-publish-card{max-width:760px}.btn.compact{min-height:34px;padding:7px 12px;font-size:13px}.task-context .actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.task-context form{margin:0}

/* 2.1.16 · lesson hour center */
.hours-summary-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:18px 0}.hours-summary-card{display:flex;align-items:baseline;gap:9px;padding:18px 20px;border:1px solid var(--line);border-radius:18px;background:#fff;box-shadow:0 10px 28px rgba(50,31,70,.05)}.hours-summary-card span{font-weight:900;color:var(--p)}.hours-summary-card strong{font-size:30px}.hours-summary-card small{color:var(--muted)}.hours-summary-card.class span{color:#a65d13}.hours-section{margin:24px 0}.hours-list-table{display:grid;gap:10px}.hours-row{display:grid;grid-template-columns:minmax(260px,1fr) minmax(300px,430px);align-items:center;gap:18px;padding:14px 16px;border:1px solid var(--line);border-radius:17px;background:#fff;box-shadow:0 8px 24px rgba(50,31,70,.04)}.hours-row.negative{border-color:#f1a2af;background:#fff8f9}.hours-identity{display:flex;align-items:center;gap:12px;min-width:0}.hours-identity>span{width:42px;height:42px;flex:none;display:grid;place-items:center;border-radius:13px;background:var(--p2);color:var(--p);font-weight:950}.hours-row.class .hours-identity>span{background:#fff0df;color:#a65d13}.hours-identity strong,.hours-identity small{display:block}.hours-identity small{margin-top:3px;color:var(--muted);font-size:11px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.hours-edit-form{display:grid;grid-template-columns:minmax(150px,1fr) auto;align-items:end;gap:9px}.hours-edit-form label{margin:0}.hours-edit-form label span{display:block;margin-bottom:5px;font-size:11px;color:var(--muted)}.hours-edit-form input{min-height:40px}.hours-edit-form .btn{min-height:40px;justify-content:center}.hours-row.negative input{color:#b42318;font-weight:900}@media(max-width:760px){.hours-summary-grid{grid-template-columns:1fr 1fr}.hours-row{grid-template-columns:1fr;gap:10px}.hours-edit-form{grid-template-columns:1fr auto}.hours-identity small{white-space:normal}}

/* 2.2.10 · student-only dual hour list */
.hours-summary-grid.single{grid-template-columns:minmax(260px,420px)}
.hours-row.dual{grid-template-columns:minmax(240px,1fr) minmax(250px,360px) minmax(250px,360px)}
.hours-row.dual .hours-edit-form{grid-template-columns:minmax(145px,1fr) auto}
.hours-empty-account{min-height:64px;padding:9px 12px;border:1px dashed var(--line);border-radius:13px;background:#faf9fd;display:flex;flex-direction:column;justify-content:center}
.hours-empty-account span{font-size:11px;color:var(--muted)}
.hours-empty-account strong{margin-top:5px;color:var(--muted);font-size:14px}
.hours-edit-form.negative-account input{color:#b42318;font-weight:900}
@media(max-width:1100px){.hours-row.dual{grid-template-columns:minmax(220px,1fr) minmax(230px,1fr)}.hours-row.dual .hours-identity{grid-column:1/-1}}
@media(max-width:760px){.hours-summary-grid.single{grid-template-columns:1fr}.hours-row.dual{grid-template-columns:1fr}.hours-row.dual .hours-identity{grid-column:auto}.hours-row.dual .hours-edit-form{grid-template-columns:1fr auto}.hours-empty-account{min-height:58px}}

/* 2.2.10 · refined dual student-hour cards */
.hours-hero-refined{align-items:center}
.refined-summary{margin-bottom:12px}
.hours-section-refined .section-head{align-items:end}
.hours-auto-save-note{color:var(--muted);font-size:12px;font-weight:750}
.student-hours-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.student-hours-card{min-width:0;padding:16px;border:1px solid rgba(112,82,239,.11);border-radius:20px;background:rgba(255,255,255,.94);box-shadow:0 12px 32px rgba(55,38,93,.055);transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}
.student-hours-card:hover{transform:translateY(-2px);border-color:rgba(112,82,239,.22);box-shadow:0 17px 38px rgba(55,38,93,.09)}
.student-hours-card.has-negative{border-color:rgba(214,68,83,.22)}
.student-hours-head{display:flex;align-items:center;gap:11px;margin-bottom:14px}
.student-hours-avatar{width:42px;height:42px;flex:none;display:grid;place-items:center;border-radius:14px;background:linear-gradient(145deg,#ede8ff,#f8f5ff);color:var(--p);font-size:17px;font-weight:950;box-shadow:inset 0 0 0 1px rgba(112,82,239,.08)}
.student-hours-name{min-width:0}
.student-hours-name strong,.student-hours-name small{display:block}
.student-hours-name strong{font-size:16px;letter-spacing:.01em}
.student-hours-name small{margin-top:3px;color:var(--muted);font-size:11px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.student-hours-balances{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.hour-balance-tile{position:relative;min-height:92px;padding:13px 14px;border-radius:16px;display:grid;grid-template-columns:minmax(0,1fr) auto;grid-template-rows:auto 1fr;align-items:center;gap:6px 10px;border:1px solid transparent;overflow:hidden}
.hour-balance-tile::after{content:"";position:absolute;right:-18px;bottom:-28px;width:72px;height:72px;border-radius:50%;background:rgba(255,255,255,.38);pointer-events:none}
.hour-balance-tile.class-hour{background:linear-gradient(145deg,#fff9df,#fff4c8);border-color:rgba(221,169,47,.18)}
.hour-balance-tile.one-hour{background:linear-gradient(145deg,#f1edff,#e9e2ff);border-color:rgba(112,82,239,.14)}
.hour-tile-label{align-self:start;min-width:0}
.hour-tile-label span{display:inline-flex;align-items:center;justify-content:center;min-width:42px;height:22px;padding:0 8px;border-radius:999px;font-size:10px;font-weight:950;letter-spacing:.05em}
.class-hour .hour-tile-label span{background:rgba(196,139,17,.13);color:#9a6510}
.one-hour .hour-tile-label span{background:rgba(112,82,239,.13);color:#6342da}
.hour-tile-label small{display:block;margin-top:6px;color:rgba(44,35,63,.58);font-size:10px;font-weight:780}
.hour-balance-tile input{position:relative;z-index:1;grid-row:1/3;grid-column:2;width:88px;min-height:58px;padding:0;border:0;background:transparent;color:var(--ink);font-size:28px;font-weight:950;line-height:1;text-align:right;outline:none;-moz-appearance:textfield}
.hour-balance-tile input::-webkit-outer-spin-button,.hour-balance-tile input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
.hour-balance-tile input:focus{filter:drop-shadow(0 3px 10px rgba(77,53,166,.13))}
.hour-balance-tile.negative-hour input{color:#c22d42}
.hour-balance-tile.negative-hour{box-shadow:inset 0 0 0 1px rgba(194,45,66,.14)}
.hour-hidden-submit{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}
.empty-hour{grid-template-columns:minmax(0,1fr) auto auto}
.empty-hour strong{grid-row:1/3;align-self:center;color:#9a6510;font-size:26px}
.empty-hour em{grid-column:1/-1;color:rgba(101,73,12,.58);font-size:10px;font-style:normal}
@media(max-width:980px){.student-hours-grid{grid-template-columns:1fr}.student-hours-card:hover{transform:none}}
@media(max-width:560px){.hours-auto-save-note{display:none}.student-hours-card{padding:14px;border-radius:18px}.student-hours-balances{gap:8px}.hour-balance-tile{min-height:86px;padding:11px;border-radius:14px}.hour-balance-tile input{width:72px;font-size:24px}.student-hours-name small{white-space:normal}}


/* 2.2.10 · administrator student buckets */
.admin-student-tabs{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,210px));
  gap:10px;
  margin:0 0 16px;
}
.admin-student-tab{
  min-height:50px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:10px 14px;
  border:1px solid var(--line);
  border-radius:15px;
  background:rgba(255,255,255,.9);
  color:var(--muted);
  text-decoration:none;
  font-size:13px;
  font-weight:900;
  box-shadow:0 8px 22px rgba(40,27,76,.05);
  transition:.18s ease;
}
.admin-student-tab:hover{
  transform:translateY(-1px);
  border-color:rgba(114,84,243,.28);
  color:var(--purple);
}
.admin-student-tab.active{
  color:#fff;
  border-color:transparent;
  background:linear-gradient(135deg,var(--purple),#8d74ff);
  box-shadow:0 12px 28px rgba(114,84,243,.22);
}
.admin-student-tab b{
  min-width:28px;
  height:28px;
  padding:0 8px;
  border-radius:999px;
  display:grid;
  place-items:center;
  background:var(--surface-2);
  color:var(--purple);
  font-size:12px;
}
.admin-student-tab.active b{
  background:rgba(255,255,255,.2);
  color:#fff;
}
.admin-student-edit-form{
  display:grid;
  grid-template-columns:minmax(120px,1.15fr) 100px 132px auto;
  align-items:center;
  gap:8px;
}
.admin-student-edit-form input,
.admin-student-edit-form select{
  width:100%;
  min-height:38px;
  border:1px solid var(--line);
  border-radius:11px;
  padding:8px 10px;
  background:#fff;
  color:var(--text);
}
.admin-student-origin{
  grid-column:1/-1;
  color:var(--muted);
  font-size:10px;
}
@media(max-width:1050px){
  .admin-student-edit-form{grid-template-columns:1fr 100px 130px auto}
}
@media(max-width:720px){
  .admin-student-tabs{grid-template-columns:1fr 1fr}
  .admin-student-layout{grid-template-columns:1fr}
  .admin-student-edit-form{grid-template-columns:1fr 1fr}
  .admin-student-edit-form select,
  .admin-student-edit-form .btn,
  .admin-student-origin{grid-column:1/-1}
}


/* 2.2.10 · duplicate student identity confirmation */
.duplicate-student-shell{max-width:860px;margin:20px auto 70px}.duplicate-student-card{background:#fff;border:1px solid #ebe8f5;border-radius:28px;padding:30px;box-shadow:0 20px 55px rgba(58,40,110,.1)}.duplicate-student-head h1{margin:8px 0 8px;font-size:clamp(26px,4vw,40px)}.duplicate-student-head p{margin:0;color:#69657a}.duplicate-match-list{display:grid;gap:12px;margin-top:24px}.duplicate-match-item{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:14px;padding:16px;border:1px solid #e5defb;border-radius:20px;background:linear-gradient(135deg,#faf8ff,#fff)}.duplicate-avatar{width:46px;height:46px;border-radius:16px;display:grid;place-items:center;background:#eee8ff;color:#6547d8;font-size:20px;font-weight:800}.duplicate-match-main{display:grid;gap:3px}.duplicate-match-main strong{font-size:18px}.duplicate-match-main span{color:#433c5c}.duplicate-match-main small{color:#817b91}.duplicate-new-student{margin-top:18px;padding:18px;border:1px dashed #e6c86c;border-radius:20px;background:#fffaf0;display:flex;align-items:center;justify-content:space-between;gap:18px}.duplicate-new-student div{display:grid;gap:5px}.duplicate-new-student small{color:#766b4c}.duplicate-cancel{display:block;text-align:center;margin-top:20px;color:#777087;text-decoration:none}.duplicate-cancel:hover{color:#5d42cf}@media(max-width:680px){.duplicate-student-card{padding:20px;border-radius:22px}.duplicate-match-item{grid-template-columns:auto 1fr}.duplicate-match-item .btn{grid-column:1/-1;width:100%}.duplicate-new-student{align-items:stretch;flex-direction:column}.duplicate-new-student .btn{width:100%}}


/* 2.2.10 · automatic student identity matching */
.auto-code-notice{display:flex;align-items:center;gap:12px;padding:13px 14px;border:1px solid rgba(114,84,243,.14);border-radius:15px;background:linear-gradient(135deg,#f7f3ff,#fff)}
.auto-code-notice>span{width:38px;height:38px;flex:none;display:grid;place-items:center;border-radius:12px;background:#ece5ff;color:var(--purple);font-weight:950}
.auto-code-notice strong,.auto-code-notice small{display:block}.auto-code-notice strong{font-size:13px}.auto-code-notice small{margin-top:3px;color:var(--muted);font-size:10px;line-height:1.55}
body.student-match-open{overflow:hidden}.student-match-modal[hidden]{display:none!important}.student-match-modal{position:fixed;inset:0;z-index:10000;display:grid;place-items:center;padding:20px}.student-match-backdrop{position:absolute;inset:0;width:100%;height:100%;border:0;background:rgba(28,20,49,.46);backdrop-filter:blur(7px);cursor:default}.student-match-dialog{position:relative;width:min(620px,100%);max-height:min(720px,calc(100vh - 40px));overflow:auto;padding:28px;border:1px solid rgba(255,255,255,.65);border-radius:28px;background:#fff;box-shadow:0 28px 90px rgba(25,16,52,.28)}.student-match-icon{width:52px;height:52px;display:grid;place-items:center;border-radius:18px;background:linear-gradient(145deg,#e9e1ff,#f7f4ff);color:var(--purple);font-size:20px;font-weight:950}.student-match-copy{margin-top:15px}.student-match-copy h2{margin:6px 0 7px;font-size:28px}.student-match-copy p{margin:0;color:var(--muted)}.student-match-options{display:grid;gap:10px;margin-top:20px}.student-match-option{position:relative;margin:0;display:grid;grid-template-columns:auto auto minmax(0,1fr);align-items:center;gap:12px;padding:13px;border:1px solid var(--line);border-radius:17px;background:#fbfaff;cursor:pointer;transition:.16s ease}.student-match-option:has(input:checked){border-color:rgba(114,84,243,.45);background:#f5f1ff;box-shadow:0 0 0 3px rgba(114,84,243,.08)}.student-match-option input{width:17px;height:17px;margin:0}.student-match-avatar{width:40px;height:40px;display:grid;place-items:center;border-radius:13px;background:#e9e2ff;color:var(--purple);font-weight:950}.student-match-info{min-width:0}.student-match-info strong,.student-match-info b,.student-match-info small{display:block}.student-match-info strong{font-size:15px}.student-match-info b{margin-top:2px;color:var(--purple);font-size:13px}.student-match-info small{margin-top:3px;color:var(--muted);font-size:10px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.student-match-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:22px}.student-match-actions .btn{min-height:46px;justify-content:center}.student-match-cancel{display:block;margin:14px auto 0;border:0;background:none;color:var(--muted);font-weight:800;cursor:pointer}.student-match-cancel:hover{color:var(--purple)}
@media(max-width:620px){.student-match-modal{padding:12px}.student-match-dialog{padding:21px;border-radius:22px}.student-match-copy h2{font-size:23px}.student-match-actions{grid-template-columns:1fr}.student-match-info small{white-space:normal}}

/* 2.2.16 · stable student creation controls on touch devices */
@media(max-width:760px){
  .account-form input,.account-form select,.account-form button{min-height:46px;font-size:16px}
  .account-submit,.student-match-actions .btn,.student-match-cancel{touch-action:manipulation}
  .student-match-dialog{-webkit-overflow-scrolling:touch;overscroll-behavior:contain}
}


/* 2.2.10 · teacher student roster: name and class only */
.student-roster-panel{overflow:hidden}
.student-roster-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:12px;
}
.student-roster-card{
  position:relative;
  min-height:76px;
  display:flex;
  align-items:center;
  gap:14px;
  padding:15px 18px;
  overflow:hidden;
  border:1px solid rgba(114,84,243,.13);
  border-radius:17px;
  background:
    radial-gradient(circle at 100% 0,rgba(114,84,243,.08),transparent 42%),
    linear-gradient(135deg,#fff 0%,#fcfaff 100%);
  box-shadow:0 9px 24px rgba(62,39,99,.055);
  transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease;
}
.student-roster-card:hover{
  transform:translateY(-2px);
  border-color:rgba(114,84,243,.27);
  box-shadow:0 14px 30px rgba(62,39,99,.09);
}
.student-roster-mark{
  width:7px;
  height:42px;
  flex:0 0 7px;
  border-radius:999px;
  background:linear-gradient(180deg,#7556f2,#b29eff);
  box-shadow:0 0 0 5px rgba(114,84,243,.07);
}
.student-roster-content{min-width:0;display:grid;gap:7px}
.student-roster-content strong{
  color:var(--ink);
  font-size:18px;
  font-weight:950;
  line-height:1.15;
  letter-spacing:.01em;
}
.student-roster-content small{
  display:block;
  overflow:hidden;
  color:var(--muted);
  font-size:12px;
  font-weight:750;
  line-height:1.35;
  text-overflow:ellipsis;
  white-space:nowrap;
}
@media(max-width:920px){
  .student-roster-grid{grid-template-columns:1fr}
}
@media(max-width:560px){
  .student-roster-grid{gap:9px}
  .student-roster-card{min-height:68px;padding:13px 14px;border-radius:15px}
  .student-roster-mark{height:36px}
  .student-roster-content strong{font-size:17px}
  .student-roster-content small{white-space:normal}
}


/* 2.2.10 · feedback draft save state */
.draft-save-state{display:inline-flex;align-items:center;gap:7px;min-height:38px;padding:0 11px;border:1px solid rgba(114,84,243,.16);border-radius:12px;background:#faf8ff;color:#62577b;font-size:11px;font-weight:800;white-space:nowrap}
.draft-save-state i{width:8px;height:8px;border-radius:99px;background:#56b88a;box-shadow:0 0 0 4px rgba(86,184,138,.12)}
.draft-save-state.saving i{background:#e8a23e;box-shadow:0 0 0 4px rgba(232,162,62,.13);animation:draftPulse 1s infinite}
.draft-save-state.editing i{background:#8d74ff;box-shadow:0 0 0 4px rgba(141,116,255,.13)}
.draft-save-state.error{color:#b73f58;background:#fff6f7;border-color:rgba(232,91,115,.24)}
.draft-save-state.error i{background:#e85b73;box-shadow:0 0 0 4px rgba(232,91,115,.12)}
.status-pill.draft{margin-left:7px;background:#f5f0ff;color:#7254f3;border:1px solid rgba(114,84,243,.15)}
@keyframes draftPulse{50%{opacity:.45;transform:scale(.82)}}
@media(max-width:760px){.draft-save-state{order:3;width:100%;justify-content:center}.feedback-frame-actions{flex-wrap:wrap}}


/* 2.2.10 · danger actions use white text instead of red labels */
.btn.danger{
  background:linear-gradient(135deg,#e85b73,#d94762);
  border-color:transparent;
  color:#fff!important;
}
.btn.danger:hover{color:#fff!important}

/* 2.2.13 · small-class and large-class feedback modes */
@media(min-width:901px){
  .feedback-choice-grid,.course-create-choice-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .feedback-choice-card,.course-create-choice{grid-template-columns:58px minmax(0,1fr);align-content:center;gap:14px;padding:22px}
  .feedback-choice-card>b,.course-create-choice>b{grid-column:2}
  .feedback-choice-icon,.course-choice-icon{width:56px;height:56px;border-radius:18px;font-size:15px}
  .feedback-choice-card h2,.course-create-choice h2{font-size:22px}
}
.feedback-choice-card.small-class{background:linear-gradient(135deg,#f2fbff,#fff)}
.feedback-choice-card.small-class .feedback-choice-icon{background:linear-gradient(135deg,#dff5ff,#c8eafb);color:#23769b}
.course-create-choice.small-class-course{background:linear-gradient(145deg,#f0fbff,#fff);border-color:#bee3f3}
.small-class-course .course-choice-icon{background:linear-gradient(135deg,#48a9cf,#83cce7);color:#fff}
.single-mode-layout .course-create-card.small_class,.single-mode-layout .created-course-card.small_class{border-top:4px solid #48a9cf}