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(width<=820px){.app-shell{grid-template-columns:1fr}.sidebar{border-right:0;border-bottom:1px solid var(--color-border);position:static}.nav{grid-template-columns:repeat(2,minmax(0,1fr))}.content{padding:24px}}.mixer-page{max-width:1180px}.mixer-header{margin-bottom:22px}.mixer-controls{gap:22px;display:grid}.mixer-class-select,.mixer-number-control{gap:7px;max-width:420px;font-weight:750;display:grid}.mixer-class-select select,.mixer-number-control select,.mixer-number-control input{border:1px solid var(--color-border);border-radius:var(--radius-control);background:var(--color-surface);width:100%;min-height:44px;color:var(--color-text);padding:9px 11px}.mixer-class-select select:focus,.mixer-number-control select:focus,.mixer-number-control input:focus{outline:3px solid var(--color-primary-soft);border-color:var(--color-primary)}.mixer-class-summary{min-height:24px;color:var(--color-text-muted);flex-wrap:wrap;align-items:baseline;gap:8px 14px;display:flex}.mixer-class-summary strong{color:var(--color-text-strong);font-size:1.05rem}.mixer-mode-tabs{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;max-width:700px;display:grid}.mixer-mode{border:1px solid var(--color-border);border-radius:var(--radius-control);background:var(--color-surface);color:var(--color-text);cursor:pointer;padding:12px 14px;font-weight:800}.mixer-mode:hover,.mixer-mode.active{border-color:var(--color-primary);background:var(--color-primary-soft);color:var(--color-primary)}.mixer-group-options{flex-wrap:wrap;align-items:end;gap:22px 34px;display:flex}.mixer-group-options fieldset{border:0;flex-wrap:wrap;gap:12px 20px;margin:0;padding:0;display:flex}.mixer-group-options legend{width:100%;margin-bottom:7px;font-weight:800}.mixer-group-options fieldset 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span{color:var(--color-text-muted);font-weight:750}.tool-timer-presets,.tool-primary-actions{flex-wrap:wrap;justify-content:center;align-items:center;gap:10px;display:flex}.tool-timer-presets button,.tool-secondary-button{border:1px solid var(--color-border);border-radius:var(--radius-control);color:var(--color-primary);cursor:pointer;background:#fff;padding:9px 12px;font-weight:750}.tool-timer-presets button:disabled{opacity:.4}.tool-play-button{background:var(--color-primary);color:#fff;cursor:pointer;min-width:120px;box-shadow:var(--shadow-primary);border:0;border-radius:999px;padding:12px 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(width<=760px){.timetable-edit-grid{grid-template-columns:1fr}}.classes-header{justify-content:space-between;align-items:flex-start;gap:20px;display:flex}.classes-layout{grid-template-columns:280px minmax(0,1fr);align-items:start;gap:22px;display:grid}.class-list-card{position:sticky;top:24px}.class-detail-stack{gap:22px;min-width:0;display:grid}.section-heading{justify-content:space-between;align-items:flex-start;gap:18px;margin-bottom:18px;display:flex}.section-heading h2{margin-bottom:4px}.section-heading p,.muted-text{color:var(--color-text-muted);margin-bottom:0}.inline-create{gap:10px;margin-bottom:18px;display:grid}.inline-create input,.rename-form input,.mapping-grid select,.student-dialog input{border:1px solid var(--color-border);border-radius:var(--radius-control);width:100%;color:var(--color-text);background:#fff;padding:10px 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(width<=640px){.rename-form,.student-row{grid-template-columns:1fr}.student-order{order:2}.compact-button{justify-self:start}.import-file-summary,.import-actions{flex-direction:column;align-items:stretch}}.dialog-backdrop{z-index:20;background:#11182757;place-items:center;padding:16px;display:grid;position:fixed;inset:0}.entry-dialog{max-height:calc(100vh - 32px);overflow:auto}.form-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;display:grid}.form-actions{justify-content:flex-end;gap:10px;margin-top:18px;display:flex}.close-button{color:var(--color-text-muted);cursor:pointer;background:0 0;border:0;font-size:1.6rem;line-height:1}@media (width<=640px){.form-grid{grid-template-columns:1fr}}.planning-page{max-width:1180px}.planning-header{justify-content:space-between;align-items:flex-end;gap:24px;display:flex}.date-control{color:var(--color-text-muted);gap:6px;font-size:.85rem;font-weight:700;display:grid}.date-control input,.editor-field input,.editor-field 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