:root{--color-ink: #172635;--color-muted: #5a6b7b;--color-subtle: #718191;--color-border: #d6e0e8;--color-border-strong: #bdcad5;--color-surface: #ffffff;--color-surface-soft: #f7fafb;--color-background: #f1f5f7;--color-primary: #176b78;--color-primary-hover: #105761;--color-primary-soft: #e5f3f4;--color-accent: #d9823f;--color-danger: #b42336;--color-danger-hover: #8a1c2b;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 18px;--shadow-sm: 0 3px 12px rgba(23, 38, 53, .06);--shadow-md: 0 14px 38px rgba(23, 38, 53, .12);color:var(--color-ink);background:var(--color-background);font-family:Yu Gothic UI,Hiragino Kaku Gothic ProN,Noto Sans JP,Segoe UI,system-ui,sans-serif;font-synthesis:none;line-height:1.6}*{box-sizing:border-box}body{margin:0;min-width:0;min-height:100vh;background:radial-gradient(circle at 8% 0%,rgba(23,107,120,.07),transparent 28rem),var(--color-background)}button,input,select,textarea{font:inherit}button{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:40px;padding:7px 12px;border:1px solid var(--color-border-strong);border-radius:var(--radius-sm);background:var(--color-surface);color:var(--color-ink);cursor:pointer;font-weight:650;white-space:nowrap;transition:background-color .16s ease,border-color .16s ease,box-shadow .16s ease,color .16s ease,transform .16s ease}button:hover{border-color:#9ab8bc;background:var(--color-primary-soft);transform:translateY(-1px)}button:disabled{cursor:not-allowed;opacity:.58;transform:none}button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid rgba(23,107,120,.28);outline-offset:2px}input,select,textarea{width:100%;min-height:42px;border:1px solid var(--color-border-strong);border-radius:var(--radius-sm);padding:8px 10px;background:var(--color-surface);color:var(--color-ink);transition:border-color .16s ease,box-shadow .16s ease}input:hover,select:hover,textarea:hover{border-color:#91aab4}textarea{min-height:74px;resize:vertical}label{display:grid;gap:5px;font-size:13px;color:var(--color-muted);font-weight:650}.characterCount{justify-self:end;color:var(--color-subtle);font-variant-numeric:tabular-nums;font-weight:500}.topbar{position:sticky;top:0;z-index:10;display:flex;justify-content:space-between;align-items:center;gap:16px;min-height:58px;padding:10px 22px;border-bottom:1px solid rgba(214,224,232,.88);background:#ffffffeb;box-shadow:0 2px 14px #1726350d;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.brand{border:0;background:transparent;color:var(--color-primary);font-weight:700;font-size:18px}.brand:hover{background:var(--color-primary-soft)}.topbar 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1fr;justify-content:stretch;gap:12px;min-height:132px;padding:18px;border-color:var(--color-border);border-radius:var(--radius-md);background:var(--color-surface);box-shadow:var(--shadow-sm);text-align:left;white-space:normal}.dashboardStatIcon{display:grid;width:42px;height:42px;place-items:center;border-radius:12px;background:var(--color-primary-soft);color:var(--color-primary)}.dashboardStat>span:nth-child(2){display:grid}.dashboardStat strong{font-size:30px;font-variant-numeric:tabular-nums;line-height:1.15}.dashboardStat small,.recentStudent small{color:var(--color-subtle)}.dashboardStat>small{grid-column:1 / -1}.recentSection{padding:20px;border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-surface);box-shadow:var(--shadow-sm)}.sectionHeader{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:14px}.sectionHeader h2{display:flex;align-items:center;gap:7px;margin-bottom:3px}.sectionHeader 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var(--color-border-strong);border-radius:var(--radius-md);background:var(--color-surface);box-shadow:var(--shadow-sm);overflow:clip}.timelineCorner,.timelineSubhead,.timelineYear,.timelineMonth,.timelineMaterial,.timelineCell{border-right:1px solid #d9e2ec;border-bottom:1px solid #d9e2ec}.timelineCorner,.timelineSubhead,.timelineMaterial{position:sticky;left:0;z-index:2}.timelineCorner,.timelineYear{position:sticky;top:0;z-index:4}.timelineSubhead,.timelineMonth{position:sticky;top:46px;z-index:3}.timelineCorner,.timelineSubhead{display:flex;align-items:center;padding:10px 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small{color:#52616f;font-size:12px;line-height:1.35}.timelineCell{grid-row:1;min-height:86px;padding:5px;background:#fff}.timelineCell:nth-child(2n){background:#fcfdff}.activeCell{background:#fff7f7}.timelinePlan{grid-row:1;display:grid;align-content:start;justify-items:start;width:100%;min-height:50px;padding:7px;border-color:#ee8f9b;background:#ffd6db;color:#7f1d2d;text-align:left;white-space:normal}.periodBar{z-index:1;align-self:center;min-height:58px;margin:0 5px;border-color:var(--subject-border);background:var(--subject-bg);color:var(--subject-ink);box-shadow:0 2px 8px #1726351f}.periodBar:hover{border-color:var(--subject-border);background:var(--subject-bg);color:var(--subject-ink)}.timelinePlan span{font-size:12px;line-height:1.35}.timelinePlan small{color:var(--subject-ink);font-size:11px;line-height:1.35}.cellAdd{width:100%;min-height:42px;padding:0;border-style:dashed;color:#607080;background:transparent}.subtleAdd{opacity:0}.timelineCell:hover .subtleAdd{opacity:1}.cellAdd span{font-size:11px}.emptyRow{color:#607080;font-weight:700}.addRowCell,.addTrack{min-height:54px}.modalBackdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:20;display:grid;place-items:center;padding:18px;background:#0c1f2b75;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.modal{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;width:min(720px,100%);max-height:92vh;overflow-y:auto;padding:18px;border:1px solid rgba(214,224,232,.9);border-radius:var(--radius-lg);background:var(--color-surface);box-shadow:var(--shadow-md)}.confirmDialog{width:min(520px,100%);padding:22px;border-radius:var(--radius-lg);background:var(--color-surface);box-shadow:var(--shadow-md)}.confirmDialog p{line-height:1.7}.confirmDialog .actions{justify-content:flex-end}.urlManagementDialog{display:grid;gap:16px;width:min(640px,100%);max-height:92vh;overflow-y:auto}.urlDialogHeader{display:flex;align-items:flex-start;justify-content:space-between;gap:14px}.urlDialogHeader h2,.urlDialogHeader p,.urlImpactNotice p,.urlSecurityNote p{margin-bottom:0}.urlStatusDetails{grid-template-columns:90px 1fr;margin:0;padding:12px 14px;border-radius:var(--radius-sm);background:var(--color-surface-soft);font-size:13px}.issuedUrlPanel,.urlSecurityNote,.urlImpactNotice{display:grid;gap:10px;padding:14px;border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-surface-soft)}.urlSecurityNote p,.urlImpactNotice p{font-size:13px;line-height:1.65}.urlImpactNotice{border-color:#eccb92;background:#fff9eb;color:#76520d}.urlDialogActions{justify-content:space-between!important}.modal h2,.modal .actions{grid-column:1 / -1}.studentModal{width:min(620px,100%)}.materialModal{width:min(760px,100%)}.modalLead{grid-column:1 / -1;margin-bottom:2px}.planEditWarnings{display:grid;grid-column:1 / -1;gap:8px}.planFilters{display:grid;grid-template-columns:minmax(220px,1.5fr) minmax(150px,1fr) auto 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solid var(--color-border);font-size:12px;font-weight:700}.detailSheet dd{color:var(--color-ink);line-height:1.75;white-space:pre-wrap}.publicHeaderActions{width:100%}.publicHeaderActions button{flex:1;min-height:44px}.mobilePlanHeader .planViewSwitch button,.detailSheet .close{min-height:44px}.topbarActions{align-items:stretch;flex-direction:column}.topbar nav button{flex:1}.staffSession{justify-content:space-between;padding-top:10px;padding-left:0;border-top:1px solid #d9e2ec;border-left:0}.page,.publicPage{padding:14px}.listWorkspace{padding:12px;border-radius:var(--radius-md)}.contextBar{padding:10px 14px 0}.dashboardStats{grid-template-columns:1fr}.sectionHeader,.recentStudent,.recentStudentMeta{align-items:stretch;flex-direction:column}.loginPage{padding:14px}.loginCard{padding:24px 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