/* KanaClass V0.6.1 · 雅致深蓝 · 轻装饰、无浮夸阴影 */
:root{
  font-family:Inter,system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --navy:#1b3354;--navy-dark:#142844;--blue:#315c92;--blue-soft:#e9f0f8;
  --ink:#22334c;--muted:#78899d;--line:#dce5f0;--line-strong:#becfe0;
  --bg:#f2f5f9;--paper:#fff;--gold:#b6a17b;--good:#27786d;--warm:#9b6239;
  --radius:14px;color:var(--ink);background:var(--bg)
}
*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--bg)}
button,select{font:inherit}button{cursor:pointer}button:disabled{opacity:.45;cursor:not-allowed}
.hidden{display:none!important}.muted{color:var(--muted)}.tiny{font-size:12px;line-height:1.65}
.eyebrow{font-size:10px;font-weight:800;letter-spacing:1.7px;color:var(--blue);text-transform:uppercase}
.wrap{max-width:1500px;margin:auto;padding:22px 27px 55px}
.topbar,.student-header{display:flex;align-items:center;justify-content:space-between;gap:18px}
.topbar{margin-bottom:18px}.branding{display:flex;align-items:center;gap:11px}
.logo{display:grid;place-items:center;width:42px;height:42px;border-radius:11px;background:var(--navy);color:#fff;font-family:'MS Mincho','Yu Mincho',serif;font-size:25px;font-weight:750;border:1px solid #314a6c}
.branding strong{display:block;font-size:16px;letter-spacing:.3px}.branding small{display:block;font-size:10px;letter-spacing:1.15px;margin-top:4px;color:var(--muted)}
.top-meta{display:flex;align-items:center;gap:8px}.tag{display:inline-flex;align-items:center;white-space:nowrap;background:var(--blue-soft);color:var(--navy);padding:7px 11px;border-radius:7px;font-size:11px;font-weight:750}
.tag.neutral,.muted-tag{background:#f0f3f7;color:#73849a}.teacher-hero{display:flex;align-items:center;justify-content:space-between;gap:22px;background:linear-gradient(105deg,#172c4b 0%,#28476c 72%,#33577c 100%);border-radius:18px;padding:27px 31px;margin-bottom:17px;color:#fff;min-height:156px;overflow:hidden;position:relative}
.teacher-hero .eyebrow{color:#b6c9df}.teacher-hero h1{font-size:27px;letter-spacing:.7px;font-weight:720;margin:10px 0}.teacher-hero p{font-size:13px;color:#cbd6e2;line-height:1.6;margin:0}.hero-mark{font-size:72px;line-height:1;font-family:'Yu Mincho','MS Mincho',serif;white-space:nowrap;letter-spacing:8px;color:rgba(255,255,255,.12);font-weight:600}
.teacher-grid{display:grid;grid-template-columns:minmax(265px,.78fr) minmax(375px,1.12fr) minmax(290px,.88fr);gap:15px;align-items:start}
.panel,.student-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.panel h2{font-size:17px;font-weight:750;margin:5px 0 0}.panel h3{font-size:14px;margin:14px 0}.panel h3 small{font-size:12px;color:var(--muted);font-weight:500}
.panel-heading{display:flex;align-items:center;justify-content:space-between;gap:10px}.panel-divider{height:1px;background:var(--line);margin:20px 0}.stats-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:7px;margin-top:26px}.stats-grid>div{display:flex;flex-direction:column;gap:7px;align-items:center;min-width:0}
.stats-grid strong{color:var(--navy);font-size:30px;font-weight:750;line-height:1}.stats-grid small{font-size:11px;color:var(--muted)}.live-dot{font-weight:850;font-size:10px;letter-spacing:1px;color:#41739c}
.note-panel{background:#eef3f9;border-left:3px solid #5b80ad;padding:14px 15px;border-radius:6px;margin-top:26px;font-size:12px;line-height:1.75;display:flex;flex-direction:column;gap:4px}.note-panel b{color:#24456b}.note-panel span{color:#667f9c}
.actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:17px}.lesson-note{margin-top:12px;font-size:12px;color:#73849a;line-height:1.8}
.btn{background:#fff;color:var(--navy);border:1px solid #c8d6e6;border-radius:9px;min-height:40px;padding:10px 13px;display:inline-flex;align-items:center;justify-content:center;gap:6px;font-size:12px;font-weight:780;transition:background .16s,border-color .16s}
.btn:hover:not(:disabled){background:#f2f6fb}.btn-primary{background:var(--navy);border-color:var(--navy);color:#fff}.btn-primary:hover:not(:disabled){background:#294b77}.btn-secondary{background:#fff;border-color:#bfcddd;color:var(--navy)}.btn-quiet{background:#f2f5f9;border-color:#e6ebf2;color:#667c97}.btn-large{width:100%;height:48px;margin-top:17px;justify-content:space-between;padding:12px 19px;font-size:14px}.btn-full{width:100%}
button:focus-visible,select:focus-visible{outline:3px solid #a6bedc;outline-offset:2px}
.preset-bar{display:flex;flex-wrap:wrap;gap:6px;margin:17px 0 13px}.chip-button{padding:7px 11px;border:1px solid #d3dfeb;background:#f7f9fc;color:#506987;border-radius:100px;font-size:11px;font-weight:750}.chip-button:hover{border-color:#8ba6c6}.chip-button.active{background:var(--navy);color:#fff;border-color:var(--navy)}
.group-title{display:flex;align-items:baseline;justify-content:space-between;gap:5px;margin:18px 0 9px;font-size:12px;font-weight:800;color:var(--navy)}.group-title small{color:#9aa9ba;font-size:10px;font-weight:500}
.row-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}
.row-tile{border:1px solid var(--line);background:#fff;display:flex;flex-direction:column;align-items:flex-start;gap:4px;text-align:left;padding:9px 11px;border-radius:9px;min-height:59px;overflow:hidden}
.row-tile:hover{border-color:#9bb1cd}.row-tile.selected{border-color:#6686ad;background:#edf2f9;box-shadow:inset 3px 0 var(--blue)}.row-tile span{font-size:12px;font-weight:850;color:#405779}.row-tile.selected span{color:var(--navy)}.row-tile small{font-family:'Yu Gothic','Meiryo','Noto Sans CJK JP',sans-serif;white-space:nowrap;font-size:12px;color:#788da4;letter-spacing:.3px}.special-grid .row-tile small{font-size:11px}
.subtle-summary{font-size:12px;color:#6b8097;margin-top:14px;line-height:1.7}.subtle-summary b{color:var(--navy)}#coverageHint{display:block;font-size:10px;color:#94a2b4}
.type-switch{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:7px;margin:17px 0 15px}.type-btn{border:1px solid #dce5ee;background:#fff;border-radius:10px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:5px;padding:10px 5px}.type-btn.selected{background:#eef3f9;border-color:#6383aa}.type-icon{display:grid;place-items:center;width:31px;height:31px;color:var(--blue);font-size:22px;font-weight:700}.type-btn b{display:block;font-size:12px;white-space:nowrap}.type-btn small{display:block;font-size:10px;color:#8396aa;margin-top:2px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.form-grid label{font-size:11px;color:#6b7f98;font-weight:750}.form-grid select{margin-top:7px;display:block;width:100%;max-width:100%;padding:10px 8px;background:#fafbfd;border:1px solid #d7e2ed;border-radius:8px;color:var(--ink);font-size:11px}
.task-preview{min-height:170px}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;text-align:center;padding:24px 18px}.empty-state span{font-size:36px;color:#a1b4cd}.empty-state b{font-size:14px;color:#5d7390}.empty-state small{font-size:11px;color:#a2b2c3;line-height:1.6}
.question-preview{border:1px solid var(--line);border-radius:9px;padding:11px 12px;margin-top:9px}.question-preview small{font-size:10px;color:#8799ae}.question-preview .jp{font-family:'Yu Gothic','Meiryo',sans-serif;font-size:24px;font-weight:750;margin-top:6px}.question-preview .answer{font-size:14px;color:var(--blue)}
.result-list{max-height:310px;overflow:auto}.result-entry{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:11px 2px;border-bottom:1px solid #edf1f6;font-size:12px;color:#637b94}.result-entry b{color:var(--navy)}.no-result{font-size:12px;color:#a0afbd;padding:17px 0}.review-entry{border-bottom:1px solid #e9eef4;padding:11px 0;font-size:12px}.review-entry b{display:block;margin-bottom:4px}.review-entry small{font-size:11px;color:#7c8da0}.hint{background:#f4f7fb;border-radius:8px;padding:12px;color:#8b9db0;font-size:11px;line-height:1.75;margin-top:17px}
footer{font-size:11px;color:#99a8bb;margin-top:16px}
/* Student */
.student-body{background:#eef2f7;min-height:100vh}.student-app{max-width:1050px;margin:auto;padding:14px 16px}.student-header{padding:2px 3px 13px}.student-header .logo{width:35px;height:35px;font-size:20px}.student-header .branding strong{font-size:15px}.student-header .branding small{font-size:9px}.student-id{color:#3b5a7d;border:1px solid #d4e0ef;background:#e7eef7;border-radius:7px;padding:8px 10px;font-size:11px;font-weight:800}
.student-card{padding:19px}.waiting,#complete{min-height:310px;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:11px;text-align:center}
.wait-icon{font-family:'Yu Mincho','MS Mincho',serif;font-size:59px;color:#375e8e;width:88px;height:88px;display:grid;place-items:center;background:#edf2f9;border:1px solid #d9e4f0;border-radius:20px}
.waiting h2,#complete h2{font-size:21px;color:var(--navy);margin:2px 0}.waiting p,#complete p{font-size:12px;color:#8797aa;line-height:1.7;margin:0}.waiting-actions{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-top:6px}
.student-progress{border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:15px;padding-bottom:12px;margin-bottom:14px}.student-progress h2{margin:3px 0;font-size:19px;color:var(--navy)}.progress-number{font-size:12px;color:#8499b1;font-weight:780;white-space:nowrap}
.exercise-items{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:11px;align-items:stretch}.exercise-card{min-width:0;background:#fbfcfe;border:1px solid #dce5ef;border-radius:11px;padding:11px;display:flex;flex-direction:column;align-items:stretch}
.exercise-card.written{border-color:#9fb4ce;background:#f9fbfe}.item-head{display:flex;justify-content:space-between;align-items:center;gap:7px}.item-head small,.item-head span{font-size:10px;color:#91a2b6}.item-prompt{font-family:'Yu Gothic','Meiryo','Noto Sans CJK JP',sans-serif;font-weight:750;font-size:26px;line-height:1.2;text-align:center;margin:7px 0 9px;color:#1d3552;overflow-wrap:anywhere}
.choice-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px;margin-bottom:auto}.choice-option{border:1px solid #cddceb;background:#fff;color:var(--navy);border-radius:8px;min-height:52px;font-size:24px;font-weight:720;font-family:'Yu Gothic','Meiryo',sans-serif}.choice-option.selected{border-color:#466e9d;background:#e6eef8}.choice-option:disabled{opacity:1}
.boards-grid{display:grid;gap:9px;align-items:start;justify-content:center}.glyph-unit{min-width:0;display:flex;flex-direction:column;align-items:stretch;gap:3px}.board-wrap{width:min(100%,240px);margin:auto}.board{position:relative;width:100%;min-height:102px;aspect-ratio:1;background:#fff;border:1.5px solid #aac0d7;border-radius:10px;overflow:hidden;isolation:isolate;touch-action:none;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
.board::before,.board::after{content:"";position:absolute;pointer-events:none;background:#e5ecf5;z-index:0}.board::before{height:1px;left:8px;right:8px;top:50%}.board::after{width:1px;top:8px;bottom:8px;left:50%}
.board canvas{position:absolute;inset:0;width:100%;height:100%;background:transparent;z-index:2;touch-action:none;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none}
.trace-board{background:#fafcff}.trace-guide{position:absolute;z-index:1;inset:0;display:flex;align-items:center;justify-content:center;font-family:'Yu Gothic','Meiryo','Noto Sans CJK JP',sans-serif;font-size:clamp(62px,10vw,138px);line-height:1;font-weight:700;color:rgba(89,137,187,.29);pointer-events:none;user-select:none;letter-spacing:0}
.ink-tools{display:flex;align-items:center;justify-content:center;gap:5px;margin-top:7px}.ink-tools button{background:#fff;color:#69809a;border:1px solid #d9e3ec;padding:5px 9px;border-radius:6px;font-size:11px;min-height:27px;font-weight:700}.ink-tools button:hover{border-color:#7997b8}.ink-value{font-size:11px;font-weight:750;color:#386a96;text-align:center;min-height:17px}.ink-candidates{display:flex;gap:5px;justify-content:center;align-items:center;min-height:25px}.ink-candidates button{min-width:32px;min-height:27px;border:1px solid #d1ddeb;border-radius:6px;background:#fff;color:#3c628f;font-family:'Yu Gothic','Meiryo',sans-serif;font-size:15px}.ink-candidates button.selected{background:#e2ecf8;border-color:#6486ae}
.exercise-actions{display:flex;align-items:center;justify-content:flex-end;gap:8px;margin-top:12px}.exercise-status{font-size:11px;color:#8194a9;min-height:15px;margin-top:9px;line-height:1.55}.feedback{background:#edf3fa;border:1px solid #d5e2f0;border-radius:9px;color:#3b5c83;padding:10px 13px;margin-top:10px;font-size:12px;line-height:1.7}.feedback.problem{background:#fff8f1;border-color:#efddc9;color:#976f40}
.card-feedback{border-top:1px solid #dce6f0;margin-top:11px;padding-top:10px;font-size:11px;color:#6e8299;line-height:1.55}.card-grade{font-size:13px;font-weight:850;color:#2b537e;margin-bottom:6px}.card-grade.good{color:#34796f}.card-grade.warn{color:#a16d4a}.card-grade.review{color:#8c7b65}.feedback-line{padding-top:7px;margin-top:6px;border-top:1px dashed #d7e1ed;display:grid;grid-template-columns:21px auto;gap:2px 8px}.feedback-line b{font-family:'Yu Gothic',sans-serif;font-size:18px;color:var(--navy);grid-row:span 2}.feedback-line strong{font-size:11px;color:var(--blue)}.feedback-line span{grid-column:2;line-height:1.6}.feedback-line small{grid-column:2;color:#98a5b5;font-size:10px;line-height:1.6}
.student-navigation{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:12px;padding-top:12px;border-top:1px solid var(--line)}.group-dots{font-size:11px;color:#95a5b7}
.complete-graphic{font-size:32px;color:var(--good);background:#e8f4ee;width:64px;height:64px;border-radius:50%;display:grid;place-items:center}.complete-score{font-size:29px!important;font-weight:830;color:var(--navy)!important}.complete-details{font-size:12px;color:#637e9c;line-height:1.9}.sub-note{color:#94a1b0}.student-footer{font-size:10px;color:#9aa7b7;text-align:center;line-height:1.5;padding:10px 4px}
.ink-warning{position:absolute;inset:0;z-index:4;padding:15px;display:grid;place-items:center;color:#955b37;background:#fff8ed;font-size:12px;text-align:center}.render-error{grid-column:1/-1;background:#fff4ef;border:1px solid #edcfc7;padding:20px;border-radius:10px;color:#9a5e43;font-size:12px}
.model-alert{border:1px solid #e7d7be;background:#fff8ec;color:#895f36;border-radius:8px;margin-top:10px;padding:10px;font-size:11px;line-height:1.6;overflow-wrap:anywhere}.model-alert:empty{display:none}.model-alert button{margin-top:6px;border:1px solid #c6a37d;background:#fff;color:#865d2d;padding:7px 10px;border-radius:6px;font-weight:700}
#exercise,#exercise *{-webkit-user-select:none!important;user-select:none!important;-webkit-touch-callout:none!important}
#exercise button{-webkit-tap-highlight-color:transparent}
@media(max-width:1250px){.teacher-grid{grid-template-columns:1fr 1fr}.result-panel{grid-column:1/-1}.wrap{padding:18px 20px 50px}}
@media(max-width:760px){.teacher-grid{grid-template-columns:1fr}.result-panel{grid-column:auto}.teacher-hero{min-height:0;padding:20px}.hero-mark{font-size:45px}.wrap{padding:12px}.panel{padding:16px}.student-app{padding:9px}.student-card{padding:12px}.exercise-items{gap:6px}.exercise-card{padding:7px}.item-prompt{font-size:22px;margin:4px 0 6px}.boards-grid{gap:6px}.choice-option{font-size:21px;min-height:43px}.student-header{margin-bottom:5px}.student-header .branding small{display:none}}
@media(max-width:580px) and (orientation:portrait){.exercise-items{grid-template-columns:repeat(3,minmax(0,1fr))}.board-wrap{max-width:135px}.trace-guide{font-size:clamp(45px,12vw,70px)}.exercise-card{padding:5px}.ink-tools{gap:2px;flex-wrap:wrap}.ink-tools button{padding:4px 5px;font-size:10px}}
@media(max-height:500px) and (orientation:landscape){.student-app{padding:4px 10px}.student-header{padding-bottom:4px}.student-header .logo{width:28px;height:28px;font-size:17px}.student-header .branding strong{font-size:12px}.student-id{padding:4px 8px;font-size:10px}.student-card{padding:8px 11px}.student-progress{padding-bottom:3px;margin-bottom:5px}.student-progress h2{font-size:14px;margin:1px 0}.student-progress .eyebrow{font-size:9px}.exercise-items{gap:5px}.exercise-card{padding:5px 7px}.item-head small,.item-head span{font-size:9px}.item-prompt{font-size:18px;margin:1px 0 5px}.board-wrap{max-width:138px}.trace-guide{font-size:90px}.ink-tools{margin-top:2px}.ink-tools button{font-size:10px;padding:3px 7px;min-height:23px}.ink-value{font-size:10px;min-height:12px}.ink-candidates{min-height:20px}.ink-candidates button{font-size:13px;min-height:22px}.exercise-actions{margin-top:4px;gap:5px}.exercise-actions .btn{min-height:30px;font-size:11px;padding:5px 10px}.exercise-status{margin-top:3px;font-size:10px}.student-navigation{margin-top:4px;padding-top:4px}.student-navigation .btn{min-height:27px;font-size:10px;padding:4px 8px}.student-footer{font-size:9px;padding:2px}.card-feedback{margin-top:5px;padding-top:5px}.feedback{margin-top:5px;padding:5px 9px}}
/* 完成后标示实际下笔顺序，不计入模型图像或自动笔顺判定 */
.stroke-markers{position:absolute;inset:0;z-index:3;pointer-events:none}
.stroke-index{position:absolute;display:grid;place-items:center;transform:translate(-50%,-50%);width:17px;height:17px;border-radius:50%;background:#b49b72;color:#fff;border:1px solid #fff;font-size:10px;line-height:1;font-weight:850}
.student-report{border-bottom:1px solid #edf1f6}
.student-report .result-entry{border-bottom:0;cursor:pointer;list-style:none}
.student-report .result-entry::-webkit-details-marker{display:none}
.student-report .result-entry:after{content:'⌄';font-size:16px;color:#98a9bc}
.student-report[open] .result-entry:after{content:'⌃'}
.report-comments{padding:5px 9px 11px;border-top:1px dashed #e1e8f0;background:#f8fafc}
.teacher-detail-line{font-size:11px;line-height:1.75;color:#617892;padding:6px 0;border-bottom:1px dashed #ebeff4}
.teacher-detail-line small{display:block;color:#94a4b7;margin-left:18px}

/* Reference and ink share the exact 256px coordinate system, including smaller kana. */
.board canvas.guide-canvas{z-index:1;pointer-events:none}
.board canvas.ink-canvas{z-index:2}

/* V0.6 handwriting scoring & unobtrusive stroke guides */
.score-breakdown{grid-column:2;display:flex;flex-wrap:wrap;gap:4px 5px;margin-top:2px}
.score-breakdown span{font-size:9px;color:#37567e;background:#e9eff8;border:1px solid #dce6f2;padding:2px 6px;border-radius:4px;line-height:1.3}
.reference-limited{position:absolute;top:4px;right:5px;z-index:1;font-size:9px;background:rgba(255,255,255,.85);color:#8293a6;padding:2px 5px;border-radius:4px;pointer-events:none}
.board canvas.guide-canvas{z-index:1!important}.board canvas.ink-canvas{z-index:2!important}
.trace-board{background:#fff}

/* V0.6.1: stroke-order and direction legend lives OUTSIDE the stroke canvas. */
.stroke-legend{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:4px 8px;min-height:23px;padding:3px 2px 0;color:#315c88;font-size:11px;font-weight:780;line-height:1.3}
.stroke-legend span{white-space:nowrap;background:#eef3fa;border:1px solid #e0e8f1;padding:2px 7px;border-radius:7px;font-family:system-ui,'Yu Gothic',sans-serif}
.exercise-actions #retryGroupBtn{margin-left:0;background:#e9f2fb;border-color:#a8bdd7;color:#244c7b}
.exercise-actions #retryGroupBtn:hover{background:#dcebf9}
@media(max-width:580px){.stroke-legend{gap:3px;font-size:10px}.stroke-legend span{padding:2px 4px}.exercise-actions{flex-wrap:wrap}}

/* V0.6.3: retain old grades while editing; clear one versus clear all. */
.previous-feedback{border-top:1px dashed #b9cde2;opacity:.78}
.previous-note{color:#36618e;font-size:11px;font-weight:750;margin:0 0 5px}
.ink-tools button[title]{border-color:#a9bed5;color:#315982}
.ink-tools button:disabled{opacity:.45;cursor:not-allowed}
#clearGroupBtn{border:1px solid #cbd8e7}

/* Historical V0.6.4 variant button styles retained for CSS compatibility; not rendered in V0.6.6. */
.stroke-variant-toggle{display:block;margin:1px auto 5px;padding:3px 9px;border:1px solid #b2c9df;border-radius:6px;background:#f2f7fb;color:#315d87;font-size:11px;cursor:pointer}.stroke-variant-toggle:hover{background:#e5f0f9}

/* V0.6.5: 横写小假名独立格使用左下象限（教学方格规则，不代表印刷排版）。 */
.small-kana-board::before{left:0;right:0;top:50%;background:#cbd9e8}
.small-kana-board::after{top:0;bottom:0;left:50%;background:#cbd9e8}
.small-kana-board{background-image:linear-gradient(to right,rgba(70,141,206,.075) 0 50%,transparent 50% 100%);background-size:100% 50%;background-position:left bottom;background-repeat:no-repeat}
.small-kana-board .ink-canvas{z-index:2}
.rewrite-guide-control{display:inline-flex;gap:6px;align-items:center;font-size:11px;font-weight:700;color:#315982;border:1px solid #b7cce0;background:#eef5fc;border-radius:7px;padding:7px 9px;cursor:pointer;white-space:nowrap}
.rewrite-guide-control input{accent-color:#315982;cursor:pointer}
.rewrite-guide-control.hidden{display:none}

/* V0.6.6: per-character standard reference and optional freehand tracing assistance. */
.standard-writing-actions{grid-column:2;display:flex;gap:6px;margin-top:4px}
.standard-writing-trigger{border:1px solid #9ab6d4;color:#244d78;background:#f1f6fc;border-radius:6px;padding:5px 9px;font-size:11px;font-weight:750;cursor:pointer;min-height:29px}
.standard-writing-trigger:hover{background:#e2effa}
.standard-writing-panel{grid-column:1/-1;margin-top:7px;border:1px solid #d6e2f0;border-radius:9px;padding:8px 9px;background:#f9fbff;color:#345575}
.standard-writing-panel>p{margin:0 0 8px;font-size:12px;font-weight:750}
.standard-writing-board{position:relative;aspect-ratio:1;max-width:190px;width:100%;margin:0 auto;border:1px solid #d3dfeb;border-radius:9px;background:linear-gradient(90deg,transparent calc(50% - .5px),#e1e8f0 50%,transparent calc(50% + .5px)),linear-gradient(0deg,transparent calc(50% - .5px),#e1e8f0 50%,transparent calc(50% + .5px)),white}
.standard-writing-board canvas{width:100%;height:100%}
.standard-writing-legend{display:flex;justify-content:center;gap:6px;flex-wrap:wrap;margin-top:8px}
.standard-writing-legend span{background:#eef4fb;border:1px solid #d8e6f4;border-radius:5px;padding:3px 6px;font-size:11px}
.standard-writing-footer{display:flex;gap:8px;justify-content:center;align-items:center;flex-wrap:wrap;margin-top:8px}
.standard-writing-footer p{font-size:11px;color:#647e9b;margin:0;flex-basis:100%;text-align:center}
.standard-writing-footer .btn{min-height:30px;padding:5px 10px;font-size:11px}
.ink-tools .cell-ghost-toggle{background:#eef5fc;border-color:#a9c2dc;color:#254b75}
.ink-tools .cell-ghost-toggle[aria-pressed="true"]{background:#dcecfb;border-color:#547da8;color:#173c68}

/* ===== V0.6.7 教师工作台：参考已确认的静态视觉稿，保留原课堂功能 ===== */
.v067-teacher{--bg:#f8f9f7;--ink:#19334c;--navy:#193d61;--muted:#748592;--line:#e3e8e7;--gold:#ae6b45;background:radial-gradient(circle at 85% 3%,#f5efe7,transparent 31%),#f8f9f7}
.v067-teacher .teacher-page{max-width:1530px;padding:0 36px 26px}
.v067-teacher .topbar{height:72px;margin:0;border-bottom:1px solid #e7e9e7;gap:20px}
.v067-teacher .branding .logo{height:40px;width:40px;border:0;border-radius:11px;background:#19334c}
.v067-teacher .branding strong{font-size:16px}
.teacher-nav{display:flex;align-items:center;gap:18px}.nav-tab{background:transparent;border:0;color:#85939e;padding:12px 4px;font-size:13px;font-weight:600;white-space:nowrap}.nav-tab.active{color:#193d61;border-bottom:2px solid #ae6b45}
.v067-teacher .tag.neutral{border:1px solid #ead8ca;border-radius:30px;background:#faf1e9;color:#a76d4c;font-size:10px}
.v067-teacher .teacher-hero{background:none;color:#19334c;margin:0;padding:16px 3px 17px;min-height:115px;border-radius:0}
.v067-teacher .teacher-hero .eyebrow{color:#b16c43;font-size:10px}.v067-teacher .teacher-hero h1{font-size:30px;margin:8px 0 9px;letter-spacing:-.03em}.v067-teacher .teacher-hero h1 em{color:#b77956;font-style:normal}.v067-teacher .teacher-hero p{color:#778894;font-size:12px}
.v067-teacher .hero-mark{font-size:58px;color:#d3dcda;font-weight:400;letter-spacing:-4px}
.v067-teacher .teacher-grid{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(340px,.96fr);gap:18px;align-items:stretch}
.v067-teacher .panel{border-color:#e3e8e7;border-radius:20px;padding:21px 25px;background:#fff;box-shadow:0 11px 29px rgba(25,51,76,.045)}
.v067-teacher .panel-heading{margin-bottom:10px}.teacher-step-title{display:flex;gap:10px;align-items:center}.teacher-step-title .step-index{background:#faf0e8;color:#b16c43;font-family:Georgia,serif;font-weight:750;font-size:12px;border-radius:9px;padding:9px}
.teacher-step-title h2{margin:0 0 4px!important;font-size:18px!important}.teacher-step-title small{color:#96a4a9;font-size:11px}
.v067-teacher .warm-hint{background:#eaf3ef;color:#518076;border-radius:100px}
.v067-teacher .preset-bar{margin:12px 0 12px;gap:6px}.v067-teacher .chip-button{background:#f8fafb;border:1px solid #e4eaec;color:#718492;border-radius:8px;padding:5px 10px;font-size:10px}.v067-teacher .chip-button.active{background:#edf3f7;color:#1b486a;border-color:#b9cbd8}
.v067-teacher .group-title{margin:12px 0 8px;color:#263f53;font-size:12px}.v067-teacher .group-title small{color:#9ba5aa;font-size:10px}
.v067-teacher .row-grid{grid-template-columns:repeat(5,minmax(0,1fr));gap:7px}
.v067-teacher .row-tile{align-items:center;justify-content:center;padding:6px 3px;min-height:59px;gap:3px;text-align:center;border:1px solid #e3e9ee;background:#fbfcfd;border-radius:10px;transition:background .15s,border .15s}
.v067-teacher .row-tile span{font-size:13px;font-weight:750;color:#39536c}
.v067-teacher .row-tile small{font-size:10px;color:#93a5b0;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.v067-teacher .row-tile.selected{background:#193d61;border-color:#193d61;box-shadow:inset 0 -3px 0 rgba(255,255,255,.08)}.v067-teacher .row-tile.selected span{color:#fff}.v067-teacher .row-tile.selected small{color:#c5d9e5}
.v067-teacher .row-tile:focus-visible,.v067-teacher .variant-tile:focus-visible{outline:3px solid #aec9de;outline-offset:2px}
.variant-grid{display:flex;gap:6px;flex-wrap:wrap}
.variant-tile{background:#fffaf6;border:1px solid #ebd1bb;border-radius:9px;min-height:35px;padding:7px 12px;font-size:12px;color:#a46b4b;font-weight:740}
.variant-tile.selected{color:#fff;background:#af6b43;border-color:#af6b43}.variant-tile:disabled{opacity:1;background:#f0f1f1;border-color:#e5e7e7;color:#b0b5b6}
.scope-explain{font-size:10px;color:#99a4a8;line-height:1.5;margin:7px 0 5px}
.advanced-categories{font-size:11px;color:#84939c;margin-top:9px}.advanced-categories summary{cursor:pointer;user-select:none}.advanced-body{border:1px solid #e7eaeb;border-radius:8px;padding:10px;margin-top:7px}.advanced-body label{cursor:pointer;color:#3a5871}.advanced-body p{margin:5px 0 0;color:#a2aeb3;font-size:10px}
.v067-teacher .subtle-summary{display:flex;flex-wrap:wrap;align-items:center;gap:3px;margin-top:13px;padding:10px 12px;background:#f7f9f9;border:1px solid #ecf0f0;border-radius:9px;font-size:11px}.v067-teacher .subtle-summary strong{color:#284357}.v067-teacher .subtle-summary b{color:#a96b44}.v067-teacher .subtle-summary span{flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:#87989e}.v067-teacher .subtle-summary small{width:100%;color:#95a3a8}
.v067-teacher .type-switch{margin:13px 0 17px;gap:8px}.v067-teacher .type-btn{height:82px;background:#fcfdfd;border:1px solid #e2e8e9;border-radius:10px;padding:8px 4px;gap:4px}.v067-teacher .type-btn.selected{background:#f0f5f8;border-color:#6385a0}.v067-teacher .type-btn .type-icon{height:24px;width:28px;font-size:20px;color:#2c5372}.v067-teacher .type-btn b{font-size:12px}.v067-teacher .type-btn small{font-size:10px;color:#92a1aa}
.compact-form-line{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:12px;margin-bottom:12px}.segmented{display:inline-flex;gap:3px;border:1px solid #e7e9e9;border-radius:9px;background:#f5f7f7;padding:3px}.segmented button{border:0;border-radius:7px;background:none;color:#8a9aa3;font-weight:700;font-size:12px;padding:8px 16px}.segmented button.active{color:#203d54;background:#fff;box-shadow:0 1px 5px #19334c10}.segmented button:disabled{opacity:.32}
.count-head{margin:9px 0 8px!important}.count-choices{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:15px}.count-tile{flex:1;min-width:90px;padding:9px 7px;font-size:11px;color:#748796;border:1px solid #e7edef;background:#fff;border-radius:8px;font-weight:650}.count-tile.selected{border-color:#b9cad7;background:#f0f5f8;color:#2b5574}
.v067-teacher .form-grid{grid-template-columns:1fr;margin:0 0 12px}.v067-teacher .form-grid select{padding:10px 11px;margin-top:7px;color:#294762;background:#fafcfd;font-size:12px}
.v067-teacher .btn-large{border-radius:10px;height:45px;margin-top:12px;justify-content:center;font-size:14px}.v067-teacher .builder-tip{font-size:10px;color:#97a8af;text-align:center;margin:12px 0 0;line-height:1.6}
.teacher-overview{margin-top:17px;display:grid;grid-template-columns:1.08fr 1fr 1fr;background:#fff;border:1px solid #e3e8e7;border-radius:17px;min-height:146px;box-shadow:0 11px 27px rgba(25,51,76,.035)}
.overview-part{min-width:0;padding:20px 24px}.overview-part+.overview-part{border-left:1px solid #e8edee}.overview-part h3{font-size:12px;color:#2c4559;margin:0 0 11px;display:flex;justify-content:space-between;align-items:center}.overview-part .stats-grid{margin:0;gap:15px}.overview-part .stats-grid>div{align-items:start}.overview-part .stats-grid strong{font-size:25px;font-weight:720}.overview-part .stats-grid small{font-size:10px}
.overview-task{display:flex;justify-content:space-between;gap:8px;font-size:12px;color:#34506b}.overview-task small{color:#91a0a6}.preview-kana{display:flex;gap:5px;flex-wrap:wrap;margin-top:12px}.preview-kana span{border:1px solid #e0e8ee;border-radius:7px;padding:6px 9px;color:#4f6a7f;background:#f8fbfd;font-size:13px}.overview-copy{font-size:11px;color:#8c9da6;line-height:1.7;margin:0 0 8px}.v067-teacher #showReview{min-height:32px;padding:6px 12px;font-size:11px;border-radius:7px}
.v067-teacher .footer-link{border:0;background:none;color:#647c90;text-decoration:underline;cursor:pointer;font-size:11px;padding:0}.v067-teacher footer a{color:#708497}
.teacher-feedback-view{padding:20px 0}.feedback-page-top{display:flex;justify-content:space-between;align-items:center;gap:24px;margin-bottom:18px}.feedback-page-top h1{font-size:30px;margin:8px 0}.feedback-page-top p{font-size:12px;color:#8999a3;margin:0}
.feedback-overview{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:15px}.feedback-overview>div{background:#fff;border:1px solid #e3e8e7;border-radius:13px;padding:17px 19px}.feedback-overview strong{display:block;color:#224663;font-size:26px}.feedback-overview small{display:block;font-size:11px;color:#8a9ca6;margin-top:4px}
.feedback-content{display:grid;grid-template-columns:1fr 1fr;gap:16px}.feedback-content .panel h2{margin:0 0 15px}.question-stat{padding:9px 0;border-top:1px solid #edf0f0}.q-stat-head{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:12px}.q-stat-head b{color:#35546a}.q-stat-head span{color:#8298a6;font-size:11px}.q-bar{height:7px;background:#ebf2f0;border-radius:10px;margin-top:7px;overflow:hidden}.q-bar span{display:block;height:100%;background:#6d9a92;border-radius:10px}.v067-teacher .result-list{max-height:520px}
@media(max-width:1130px){.v067-teacher .teacher-page{padding:0 22px 20px}.v067-teacher .teacher-grid{grid-template-columns:1fr}.teacher-overview{grid-template-columns:1fr 1fr}.overview-part:last-child{grid-column:1/-1;border-left:0;border-top:1px solid #e8edee}}
@media(max-width:700px){.v067-teacher .teacher-page{padding:0 12px 18px}.teacher-nav{gap:6px}.teacher-nav .tag{display:none}.nav-tab{font-size:10px;padding:9px 2px}.v067-teacher .teacher-hero h1{font-size:23px}.v067-teacher .hero-mark{font-size:35px}.v067-teacher .panel{padding:16px 14px}.v067-teacher .row-grid{gap:5px}.v067-teacher .row-tile{min-height:52px}.v067-teacher .row-tile span{font-size:12px}.v067-teacher .row-tile small{font-size:9px}.variant-tile{padding:6px 9px;font-size:11px}.teacher-overview,.feedback-content,.feedback-overview{grid-template-columns:1fr}.overview-part+.overview-part{border-left:0;border-top:1px solid #e8edee}.overview-part:last-child{grid-column:auto}.feedback-page-top h1{font-size:23px}.feedback-overview{grid-template-columns:repeat(2,1fr)}}

/* ===== V0.6.7 学生端：单独反馈页、紧凑选择题、测验结果 ===== */
.student-body{background:#f2f5f7}.student-app{max-width:1220px}.student-card{border-radius:16px}
.task-instruction{font-size:19px;color:#1b3e62;font-weight:820;margin:1px 0 15px;padding:8px 0 11px;border-bottom:1px solid #e4ebf1}
.exercise-items.choice-layout{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.choice-layout .exercise-card{padding:10px 12px}.choice-layout .item-prompt{font-size:24px;margin:9px 0}.choice-layout .choice-option{min-height:40px;font-size:21px}
#groupFeedback{min-height:380px}.feedback-headline{font-weight:800;color:#246f67;font-size:17px;background:#f0f7f4;border-radius:10px;padding:13px;margin:12px 0 16px}.feedback-entries{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}.feedback-result-card{border:1px solid #e0e9f0;background:#fbfdff;border-radius:12px;padding:15px;min-width:0}.feedback-item-title{font-size:24px;color:#203f65;font-weight:780;margin-bottom:9px}.feedback-result-card .card-feedback{border-top:0;margin-top:0}.feedback-result-card .feedback-line{font-size:12px}.feedback-result-card .feedback-line small{font-size:11px}
#exercise .exercise-card .card-feedback{display:none}
#complete{align-items:stretch;text-align:center;gap:13px}.complete-feedback{margin-top:10px;max-width:960px;width:100%;text-align:left;align-self:center}.complete-feedback h3{font-size:16px;color:#284c6c}.completion-row{border:1px solid #e2eaf0;background:#fbfdff;border-radius:10px;padding:12px 15px;margin:9px 0;color:#516a81;font-size:12px;line-height:1.7}.completion-row-top{display:flex;justify-content:space-between;gap:15px;font-size:13px}.completion-row-top b{color:#214b6b}.completion-row .correct{color:#2d7b6e;font-weight:800}.completion-row .incorrect{color:#a56d4b;font-weight:800}.completion-row-answer,.completion-parts{color:#7e91a1;font-size:12px;margin-top:5px}.finish-standard{max-width:180px;margin:8px auto;border:1px solid #d4e1e9;border-radius:9px;aspect-ratio:1}.finish-standard canvas{width:100%;height:100%}
.exercise-items.study-layout{grid-template-columns:1fr;max-width:540px;margin:0 auto}.study-card{padding:20px;align-items:center}.study-word{display:flex;align-items:baseline;justify-content:center;gap:15px}.study-word strong{font-family:'Yu Gothic','Meiryo',sans-serif;color:#254b70;font-size:46px}.study-word span{color:#8fa2b2;font-size:18px}.study-rounds{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin:10px 0 16px;font-size:12px;color:#8d9da9}.study-rounds span{background:#f4f6f7;border:1px solid #edf1f2;border-radius:20px;padding:6px 12px}.study-rounds span.current{background:#eaf2f8;color:#1e5079;border-color:#aac6dd;font-weight:800}.study-board{width:min(100%,320px);aspect-ratio:1;margin:auto}.study-card .ink-tools{margin-top:13px}
@media(max-width:760px){.exercise-items.choice-layout{grid-template-columns:repeat(2,minmax(0,1fr))}.feedback-entries{grid-template-columns:1fr}.task-instruction{font-size:16px;margin-bottom:8px}.completion-row-top{flex-wrap:wrap}}
@media(max-width:480px){.exercise-items.choice-layout{grid-template-columns:1fr}.choice-layout .exercise-card{padding:11px}.choice-layout .item-prompt{font-size:27px}.study-card{padding:12px}.student-card{padding:13px}}

/* 课堂投屏只展示群体统计，学生明细默认折叠 */
.v067-teacher .feedback-content{display:block}.v067-teacher .teacher-personal{margin-top:15px}.teacher-personal summary{cursor:pointer;font-weight:750;font-size:13px;color:#284b68}.teacher-personal[open] summary{margin-bottom:15px}

/* V0.6.8：三格并列学写／组合假名逐字一遍。沿用原深蓝色布局。 */
.exercise-items.study-layout{max-width:1160px;width:100%;grid-template-columns:1fr;margin:0 auto}
.study-card{align-items:stretch;padding:18px 20px;max-width:none}
.study-word{display:flex;justify-content:center;align-items:baseline;gap:18px}
.study-word strong{font-size:42px}
.study-subline{text-align:center;color:#65809a;font-size:13px;margin:4px 0 17px}
.study-boards{display:grid;grid-template-columns:repeat(var(--study-cols,3),minmax(0,1fr));gap:16px;align-items:stretch}
.study-unit{min-width:0;display:flex;flex-direction:column;gap:7px;border:1px solid #d9e5f0;border-radius:14px;padding:12px;background:#fff}
.study-pass-title{text-align:center;font-size:15px;font-weight:750;color:#244568;min-height:22px}
.study-unit .board.study-board{width:100%;max-width:255px;min-height:0;align-self:center;margin:0 auto;aspect-ratio:1}
.study-unit .ink-tools{margin-top:0;justify-content:center}
.study-board-result{min-height:48px;color:#607b96;text-align:center;font-size:12px;display:flex;flex-direction:column;gap:3px;align-items:center;justify-content:center;line-height:1.5}
.study-board-result b{font-size:20px;color:#1f6e66}
.study-board-result span{font-size:12px}
.study-board-result.stale{color:#aa753b}
.study-board-result.stale b{color:#aa753b}
.study-unit .stroke-legend{font-size:11px;color:#889bad;line-height:1.5;min-height:20px;text-align:center}
.study-total{text-align:center;background:#eaf4f2;color:#27675f;border:1px solid #bedbd5;padding:11px;margin-top:14px;border-radius:12px;font-weight:650}
.study-total.stale{background:#fff5e5;color:#9b6b31;border-color:#ead6b5}
@media(max-width:700px){
 .study-card{padding:11px}
 .study-boards{display:flex;overflow-x:auto;gap:10px;padding-bottom:8px;scroll-snap-type:x mandatory}
 .study-unit{flex:0 0 min(74vw,235px);scroll-snap-align:start;padding:9px}
 .study-word strong{font-size:34px}
}

/* V0.6.9: compact neutral teaching copy and cloud classroom control */
.teacher-hero.compact-hero{min-height:76px;padding:16px 24px;margin-bottom:14px;border-radius:14px}
.teacher-hero.compact-hero h1{font-size:24px;margin:0;font-weight:700}
.teacher-hero.compact-hero .hero-mark{font-size:42px;letter-spacing:1px}
.online-room-panel{margin:14px 0 16px;background:#fff;border:1px solid #dbe5ed;border-radius:14px;padding:16px 20px}
.online-room-title{display:flex;align-items:center;gap:10px;justify-content:space-between;margin-bottom:12px;color:#193d61;font-weight:750}
.room-state{font-size:12px;color:#69849c;background:#f0f4f8;padding:5px 10px;border-radius:12px}
#roomBefore{display:flex;align-items:center;flex-wrap:wrap;gap:10px}
#roomBefore .tiny{flex-basis:100%;margin:0}
.room-secret-label{display:flex;align-items:center;gap:9px;font-weight:650;font-size:13px}
.room-secret-label input{width:240px;max-width:55vw;min-height:36px;padding:8px 10px;border:1px solid #ccdbe8;border-radius:8px;color:#234063}
.room-qr{display:flex;gap:17px;align-items:center}.room-qr img{border:1px solid #dce6ef;background:white;padding:5px;width:152px;height:152px;object-fit:contain;border-radius:8px}
.room-number{font-size:28px;font-weight:850;letter-spacing:2px;color:#183d63}.room-url{display:block;color:#315c92;overflow-wrap:anywhere;font-size:12px;margin:5px 0 8px}
.room-row{display:flex;gap:8px;flex-wrap:wrap}.room-row .btn{min-height:34px;padding:8px 10px;font-size:12px}
#cloudRoomMessage{margin:8px 0 0}
@media(max-width:760px){.teacher-hero.compact-hero{padding:12px 16px;min-height:64px}.teacher-hero.compact-hero h1{font-size:21px}}
@media(max-width:480px){.room-qr{align-items:flex-start}.room-qr img{width:108px;height:108px}.room-number{font-size:21px}.room-secret-label input{width:170px}}

/* 云端二维码改为按需打开的弹层，不占工作台首屏高度 */
.cloud-modal{position:fixed;inset:0;z-index:1000;background:rgba(19,40,66,.45);display:grid;place-items:center;padding:18px;overflow-y:auto}
.cloud-dialog{position:relative;width:min(590px,100%);max-height:min(92vh,760px);overflow:auto;background:#fff;border-radius:16px;box-shadow:0 18px 60px rgba(17,44,74,.17);padding:12px}
.cloud-dialog-close{position:absolute;top:6px;right:10px;border:0;background:transparent;font-size:28px;line-height:1;color:#53718d;z-index:1;padding:5px 10px}
.cloud-dialog .online-room-panel{margin:0;border:none;padding:13px 16px 10px}
@media(max-width:500px){.cloud-dialog{padding:7px}.cloud-dialog .online-room-panel{padding:12px}}