:root{--bg: #f3f5f8;--card: #fff;--ink: #1d2733;--sub: #5a6b7b;--line: #dde4ec;--accent: #2563b0;--accent-ink: #fff;--todo: #0a7c54;--draft: #b8860b;--done: #3a6ea5;--expired: #9aa6b2;--proxy: #7b4fb5;--ok: #0a7c54;--warn: #b8860b;--err: #c0392b;--proxybg: #f3eefb;--min-tap: 48px}*,*:before,*:after{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:-apple-system,Hiragino Kaku Gothic ProN,Yu Gothic,system-ui,sans-serif;font-size:16px;line-height:1.7;-webkit-text-size-adjust:100%}#app{display:block;max-width:480px;margin:0 auto;min-height:100vh;background:var(--bg);padding:14px}@media(min-width:768px){html,body{background:#e7ecf1}#app{max-width:720px;margin:28px auto;min-height:calc(100vh - 56px);border-radius:18px;box-shadow:0 8px 32px #00000021;background:var(--card)}}button{font-family:inherit}button.primary{display:block;width:100%;min-height:var(--min-tap);border:0;border-radius:12px;font-size:16px;font-weight:700;cursor:pointer;margin-top:8px;background:var(--accent);color:var(--accent-ink)}button.secondary{min-height:var(--min-tap);border:1px solid var(--line);border-radius:12px;font-size:15px;font-weight:700;cursor:pointer;background:#e7edf3;color:var(--ink);padding:0 16px}button.small{min-height:40px;border:1px solid var(--line);border-radius:10px;font-size:14px;cursor:pointer;background:#e7edf3;color:var(--ink);padding:0 14px}button.link,a.link,.logout-link{display:inline-flex;align-items:center;min-height:40px;padding:0 6px;background:transparent;border:0;color:var(--accent);font-size:15px;font-weight:600;text-decoration:underline;cursor:pointer}input[type=text],input[type=password],input[type=number],input[type=date],textarea,select{width:100%;min-width:0;font-size:16px;padding:12px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);min-height:var(--min-tap)}textarea{min-height:120px;line-height:1.6;resize:vertical}.page-header{display:flex;flex-wrap:wrap;align-items:center;gap:8px;background:var(--accent);color:var(--accent-ink);padding:12px 14px;border-radius:12px;margin-bottom:14px;font-weight:700;font-size:17px}.page-title{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.header-actions{display:flex;gap:8px;flex-wrap:wrap}.header-actions button.secondary{background:#ffffff2e;color:#fff;border-color:#ffffff59}.home-header{display:flex;flex-wrap:wrap;align-items:center;gap:8px;background:var(--accent);color:var(--accent-ink);padding:12px 14px;border-radius:12px;margin-bottom:14px}.home-header .app-name,.login-header .app-name{font-weight:700;font-size:17px}.home-header .greeting{flex:1;min-width:0;font-weight:700;font-size:17px}.home-header .user-name{flex:1;min-width:0}.home-header .logout-link,.home-header .link{color:#fff}h2{font-size:16px;margin:4px 0 10px}.login-screen .login-header{display:flex;align-items:center;justify-content:space-between;background:var(--accent);color:var(--accent-ink);padding:12px 14px;border-radius:12px;margin-bottom:14px}.login-screen .auth-state{font-size:12px;opacity:.85}.login-screen .panel{display:flex;flex-direction:column;gap:10px}.error{background:#fdeceb;color:var(--err);border:1px solid #f3c4c0;border-radius:12px;padding:12px 14px;margin-bottom:12px;font-size:14px}.ws-cards{display:flex;flex-direction:column}.ws-card{display:flex;flex-wrap:wrap;align-items:center;gap:6px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px;margin-bottom:12px}.ws-card .ws-title{flex:1 1 100%;font-weight:700;font-size:16px}.state-label{display:inline-block;font-size:12px;font-weight:700;border-radius:999px;padding:3px 10px;color:#fff;background:var(--expired)}.state-none .state-label{background:var(--todo)}.state-draft .state-label{background:var(--draft)}.state-submitted .state-label{background:var(--done)}.comment-flag{display:inline-block;font-size:12px;font-weight:700;border-radius:999px;padding:3px 10px;color:#fff;background:var(--accent)}.open-btn{flex:1 1 100%;min-height:var(--min-tap);border:0;border-radius:12px;font-size:16px;font-weight:700;cursor:pointer;margin-top:6px;background:var(--accent);color:#fff}.role-badge{display:inline-block;font-size:12px;font-weight:700;border-radius:999px;padding:3px 10px;color:#fff;background:var(--sub)}.role-instructor{background:var(--todo)}.role-admin{background:var(--proxy)}.action-cards{display:grid;grid-template-columns:1fr;gap:12px;margin-bottom:16px}@media(min-width:768px){.action-cards{grid-template-columns:1fr 1fr}}.card{display:block;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px;text-decoration:none;color:var(--ink);cursor:pointer}.card-title{font-weight:700;font-size:16px;margin-bottom:6px;color:var(--accent)}.card-help{font-size:13px;color:var(--sub)}.worksheet-list{margin-bottom:16px}.worksheet-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px 14px;margin-bottom:10px}.worksheet-row .ws-title{flex:1;min-width:0;font-weight:700}.worksheet-row .ws-progress{font-size:13px;color:var(--sub)}.admin-guidance{font-size:13px;color:var(--sub);background:#eef4fb;border:1px solid #cfe0f3;border-radius:12px;padding:12px 14px}.answer-form .form-header{margin-bottom:8px}.save-indicator{display:block;font-size:12px;color:var(--sub);margin:4px 0 12px;min-height:16px}.form-fields{display:flex;flex-direction:column}.form-field{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px;margin-bottom:12px}.field-label{display:block;font-weight:700;font-size:15px;margin-bottom:8px}.required-mark{color:#d33;font-weight:700;margin-left:4px}.form-field.field-error{border-color:#d33;box-shadow:0 0 0 2px #dd33332e}.required-error{color:#d33;font-size:14px;margin:4px 0 12px}.checkbox-group{display:flex;flex-direction:column}.checkbox-option{display:flex;align-items:center;gap:10px;min-height:var(--min-tap);padding:8px 12px;border:1px solid var(--line);border-radius:10px;margin:6px 0;font-size:16px;cursor:pointer}.checkbox-option input{width:22px;height:22px;min-height:auto}.form-actions{margin-top:8px}.split{display:flex;flex-direction:column;gap:12px}@media(min-width:768px){.split{flex-direction:row;align-items:flex-start}.student-pane{flex:0 0 240px}.viewer{flex:1;min-width:0}}.student-pane{display:flex;flex-direction:column}.student-row{display:flex;align-items:center;justify-content:space-between;gap:8px;width:100%;min-height:var(--min-tap);text-align:left;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:8px 12px;margin-bottom:8px;font-size:15px;cursor:pointer}.student-row.selected{border-color:var(--accent);box-shadow:0 0 0 2px #2563b02e}.student-row .student-name{font-weight:700}.student-state{font-size:12px;font-weight:700;border-radius:999px;padding:2px 8px;color:#fff;background:var(--draft)}.student-state.state-submitted{background:var(--done)}.viewer{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px}.viewer-empty{color:var(--sub);font-size:14px}.field-block{border-bottom:1px solid var(--line);padding-bottom:12px;margin-bottom:12px}.field-answer{background:#f7f9fc;border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin:6px 0;white-space:pre-wrap;word-break:break-word}.field-comment{display:flex;flex-direction:column;gap:6px}.overall-comment{margin-top:8px}.overall-label{font-weight:700;font-size:15px;margin-bottom:4px}.overall-note{font-size:13px;color:var(--sub);margin:0 0 6px}.overall-actions{display:flex;flex-wrap:wrap;gap:8px}.overall-actions button.primary,.overall-actions button.secondary{width:auto;flex:1}.auto-update{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600}.auto-update .dot{width:9px;height:9px;border-radius:50%;background:var(--ok);display:inline-block}.sort-bar{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}.sort-option{min-height:40px;border:1px solid var(--line);background:#fff;border-radius:10px;padding:0 14px;font-size:14px;cursor:pointer;color:var(--sub)}.progress-table{display:flex;flex-direction:column}.progress-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px 14px;margin-bottom:8px}.progress-row.stalled{background:#fdeceb;border-color:#f3c4c0}.progress-row .student-name{flex:1;min-width:0;font-weight:700}.progress-row .student-percent{font-weight:700;color:var(--accent)}.progress-row .student-state,.progress-row .student-updated{font-size:13px;color:var(--sub);background:transparent;padding:0}.expand{min-height:40px;border:1px solid var(--line);background:#e7edf3;border-radius:10px;padding:0 14px;font-size:14px;cursor:pointer}.row-detail:not(:empty){background:#f7f9fc;border:1px solid var(--line);border-radius:12px;padding:12px 14px;margin:-2px 0 10px}.detail-field{margin-bottom:10px}.detail-label{font-weight:700;font-size:14px}.detail-answer{white-space:pre-wrap;word-break:break-word}.print-modes,.print-targets,.print-filters,.print-options{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px;margin-bottom:12px}.block-title{font-weight:700;font-size:15px;margin-bottom:8px}.mode-label,.target-label,.option-label{display:flex;align-items:center;gap:10px;min-height:var(--min-tap);padding:6px 8px;font-size:16px;cursor:pointer}.mode-label input,.target-label input,.option-label input{width:22px;height:22px;min-height:auto}.filter-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:10px}.filter-row select{flex:0 0 auto;width:auto}.filter-row input{flex:1;min-width:0}.print-actions{margin-top:8px}.print-note{font-size:13px;color:var(--sub);margin:0 0 6px}.projection-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:50;background:var(--bg);display:flex;flex-direction:column;padding:0}.projection-bar{display:flex;align-items:center;justify-content:space-between;gap:8px;background:var(--accent);color:#fff;padding:14px 20px}.projection-hint{font-size:16px;opacity:.9}.projection-exit{min-height:var(--min-tap);border:0;border-radius:10px;background:#ffffff2e;color:#fff;padding:0 18px;font-size:16px;font-weight:700;cursor:pointer}.projection-stage{flex:1;overflow:auto;padding:32px clamp(20px,6vw,80px)}.projection-name{font-size:clamp(28px,5vw,48px);font-weight:700;margin-bottom:24px}.projection-field{margin-bottom:28px}.projection-question{font-size:clamp(20px,3vw,30px);font-weight:700;color:var(--sub);margin-bottom:8px}.projection-answer{font-size:clamp(22px,3.5vw,36px);line-height:1.5;white-space:pre-wrap;word-break:break-word}.proxy-page .reason-block{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px;margin-bottom:12px}.proxy-page .reason-block label{display:block;font-weight:700;font-size:15px;margin-bottom:6px}.reason-error{color:var(--err);font-size:14px;margin:6px 0}.proxy-fields{display:flex;flex-direction:column}.proxy-field-block{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px;margin-bottom:12px}.proxy-actions{margin-top:8px}.proxy-badge{display:inline-block;font-size:12px;font-weight:700;border-radius:999px;padding:3px 10px;color:var(--proxy);background:var(--proxybg);border:1px solid #d9c9f1}.proxy-banner{background:var(--proxybg);color:var(--proxy);border:1px solid #d9c9f1;border-radius:12px;padding:12px 14px;margin-bottom:12px;font-weight:700}.proxy-banner p{margin:6px 0 0;font-weight:400;font-size:14px}.shell-back-bar{margin-bottom:12px}.shell-back-bar button{min-height:40px;border:1px solid var(--line);background:#fff;border-radius:10px;padding:0 14px;font-size:14px;color:var(--accent);cursor:pointer}.shell-screen{display:block}