:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;--ink:var(--text-primary,#161614);--muted:var(--text-secondary,#69655d);--line:var(--border-color,#d8d3c8);--panel:var(--bg-surface,#f8f7f3);--paper:var(--bg-primary,#fffdfa);--card:var(--bg-surface,#fff);--field:var(--bg-input,#fff);--accent:var(--accent-primary,#006d6f);--accent-strong:var(--button-hover-bg,#004f51);--success:var(--success-color,#1f7a3a);--danger:var(--error-color,#b7372f);--warning:var(--warning-color,#9b5a00)}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial}}*{box-sizing:border-box}html,body{min-height:100%}body{background:var(--paper);color:var(--ink);margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,select,input,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}.app-shell{flex-direction:column;min-height:100vh;display:flex}.topbar{border-bottom:1px solid var(--line);background:var(--card);justify-content:space-between;align-items:center;gap:24px;padding:22px 28px;display:flex}.eyebrow{color:var(--accent);text-transform:uppercase;letter-spacing:0;margin:0 0 4px;font-size:.78rem;font-weight:700}h1,h2{letter-spacing:0;margin:0}h1{font-size:clamp(1.55rem,2vw,2.1rem)}.course-alias{color:var(--muted);margin:4px 0 0;font-size:.9rem}h2{font-size:1rem}.status-strip{color:var(--muted);flex-wrap:wrap;justify-content:flex-end;gap:8px;display:flex}.profile-switcher{min-width:180px;color:var(--muted);gap:5px;font-size:.82rem;font-weight:800;display:grid}.admin-link,.admin-header-actions a{border:1px solid var(--line);background:var(--panel);min-height:44px;color:var(--ink);white-space:nowrap;border-radius:6px;justify-content:center;align-items:center;padding:6px 10px;font-size:.86rem;font-weight:800;text-decoration:none;display:inline-flex}.status-strip span{border:1px solid var(--line);background:var(--panel);white-space:nowrap;border-radius:6px;align-items:center;min-height:34px;padding:6px 10px;display:inline-flex}.login-shell{background:var(--panel);place-items:center;min-height:100vh;padding:24px;display:grid}.login-panel{border:1px solid var(--line);background:var(--paper);border-radius:8px;gap:20px;width:min(460px,100%);padding:28px;display:grid}.login-copy,.login-confirmation p{color:var(--muted);margin:0;line-height:1.5}.login-form{gap:14px;display:grid}.login-form label{color:var(--muted);gap:7px;font-weight:800;display:grid}.login-form input{border:1px solid var(--line);min-height:44px;color:var(--ink);border-radius:6px;padding:9px 11px}.login-form button,.login-confirmation button{background:var(--accent);color:#fff;border:0;border-radius:6px;min-height:44px;padding:10px 14px;font-weight:800}.dev-login-form{border-top:1px solid var(--line);padding-top:18px}.workspace{flex:1;grid-template-columns:minmax(230px,280px) minmax(360px,1fr) minmax(260px,340px);min-height:0;display:grid}.control-panel,.activity-panel{background:var(--panel);padding:22px}.control-panel{border-right:1px solid var(--line)}.activity-panel{border-left:1px solid var(--line)}.control-panel label,.control-panel fieldset{color:var(--muted);gap:8px;margin:0 0 18px;font-size:.86rem;font-weight:700;display:grid}select{border:1px solid var(--line);background:var(--field);width:100%;min-height:42px;color:var(--ink);border-radius:6px;padding:8px 10px}fieldset{border:0;padding:0}legend{margin-bottom:8px}.check-row{grid-template-columns:18px 1fr;align-items:center;display:grid;color:var(--ink)!important;font-weight:500!important}.primary-action{background:var(--accent);color:#fff;border:0;border-radius:6px;min-height:44px;padding:10px 14px;font-weight:800}.primary-action:hover{background:var(--accent-strong)}.primary-action.compact{min-height:38px;padding:7px 12px}.secondary-action{border:1px solid var(--line);background:var(--card);min-height:38px;color:var(--ink);border-radius:6px;padding:7px 12px;font-weight:800}.secondary-action:hover{border-color:var(--accent);color:var(--accent-strong)}.music-staircase-page{background:var(--paper);align-content:start;gap:18px;min-height:100vh;padding:clamp(18px,4vw,34px);display:grid}.music-staircase-header,.music-staircase-brief,.music-staircase-controls,.music-staircase-status,.music-staircase-diagnostics,.music-staircase-workbench{width:min(1120px,100%);margin:0 auto}.music-staircase-header{border-bottom:1px solid var(--line);justify-content:space-between;align-items:flex-start;gap:18px;padding-bottom:18px;display:flex}.music-staircase-header h1{font-size:clamp(1.8rem,3vw,3rem)}.music-staircase-subtitle{color:var(--muted);margin:6px 0 0}.music-staircase-brief{border:1px solid var(--line);background:var(--panel);border-radius:8px;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:14px;padding:14px;display:grid}.music-staircase-brief div{min-width:0}.music-staircase-brief h2{color:var(--accent-strong);letter-spacing:0;text-transform:uppercase;margin:0 0 6px;font-size:.78rem}.music-staircase-brief p{color:var(--muted);margin:0;line-height:1.45}.music-staircase-brief kbd,.key-hint{border:1px solid var(--line);background:var(--card);min-width:26px;min-height:24px;color:var(--ink);border-radius:6px;justify-content:center;align-items:center;padding:1px 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var(--line);background:var(--panel);min-height:34px;color:var(--muted);border-radius:6px;align-items:center;padding:6px 10px;font-weight:750;display:inline-flex}.music-staircase-diagnostics{border:1px solid var(--line);background:var(--panel);border-radius:8px}.music-staircase-diagnostics summary{cursor:pointer;min-height:46px;color:var(--ink);align-items:center;padding:10px 14px;font-weight:850;display:flex}.music-staircase-diagnostics summary:hover{color:var(--accent-strong)}.music-staircase-evidence{border-top:1px solid var(--line);gap:10px;padding:12px;display:grid}.music-staircase-evidence-row{grid-template-columns:minmax(150px,.24fr) minmax(0,1fr);align-items:center;gap:10px;min-width:0;display:grid}.music-staircase-evidence-row.command{grid-template-columns:minmax(150px,.24fr) minmax(0,1fr) auto}.music-staircase-evidence-row>span{color:var(--muted);font-size:.82rem;font-weight:800}.music-staircase-evidence code{border:1px solid var(--line);background:var(--card);min-height:32px;color:var(--ink);white-space:nowrap;border-radius:6px;padding:7px 9px;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,monospace;font-size:.82rem;line-height:1.3;display:block;overflow-x:auto}.music-staircase-copy-status{white-space:nowrap;color:var(--muted);justify-self:start;font-weight:800}.music-staircase-error{width:min(1120px,100%);margin:0 auto}.music-staircase-workbench{border:1px solid var(--line);background:var(--card);border-radius:8px;align-content:center;gap:22px;min-height:520px;padding:clamp(18px,5vw,42px);display:grid}.music-staircase-trial-head{justify-content:space-between;align-items:flex-start;gap:14px;display:flex}.music-staircase-trial-head h2{font-size:clamp(1.4rem,2vw,2rem)}.music-staircase-trial-instructions{color:var(--muted);margin:8px 0 0;line-height:1.45}.music-staircase-trial-head>span{border:1px solid var(--line);min-height:32px;color:var(--muted);white-space:nowrap;border-radius:999px;align-items:center;padding:5px 10px;font-weight:800;display:inline-flex}.music-staircase-feedback{border:1px solid var(--line);background:var(--panel);border-radius:8px;flex-wrap:wrap;justify-content:center;align-items:center;gap:12px;padding:12px;display:flex}.music-staircase-feedback.correct strong{color:var(--success)}.music-staircase-feedback.incorrect strong{color:var(--danger)}.music-staircase-complete,.music-staircase-empty{text-align:center;justify-items:center;gap:14px;display:grid}.music-staircase-empty{justify-self:center;width:min(560px,100%)}.music-staircase-empty p:not(.eyebrow),.music-staircase-complete p:not(.eyebrow){color:var(--muted);margin:0;line-height:1.45}.music-staircase-complete h2,.music-staircase-empty h2{font-size:clamp(2rem,5vw,4rem)}@media (max-width:900px){.music-staircase-header,.music-staircase-brief,.music-staircase-evidence-row,.music-staircase-evidence-row.command{grid-template-columns:1fr}.music-staircase-header{display:grid}.music-staircase-run-actions,.music-staircase-nav{justify-content:flex-start}.music-staircase-evidence code{white-space:pre-wrap;overflow-wrap:anywhere}}.error-text{color:var(--danger);line-height:1.4}.practice-submit-error{border:1px solid color-mix(in srgb, var(--danger) 42%, var(--line));background:color-mix(in srgb, var(--danger) 10%, var(--card));width:100%;color:var(--ink);border-radius:8px;padding:11px 13px;font-weight:800;line-height:1.4}.practice-surface{background:var(--paper);justify-content:center;align-items:flex-start;min-width:0;padding:clamp(18px,4vw,40px);display:flex}.empty-state,.prompt{width:min(820px,100%)}.empty-state{border:1px dashed var(--line);min-height:480px;color:var(--muted);text-align:center;border-radius:8px;place-items:center;gap:18px;display:grid}.lesson-empty,.lesson-summary{background:var(--card);border-style:solid;min-height:min(560px,72vh);padding:clamp(28px,6vw,56px)}.lesson-empty h2,.lesson-summary h2{color:var(--ink);margin:0;font-size:clamp(2rem,4vw,3.4rem);line-height:1.05}.lesson-empty p,.lesson-summary p{max-width:34rem;margin:0;line-height:1.55}.thai-large{letter-spacing:0;overflow-wrap:anywhere;margin:0;font-family:Noto Sans Thai,Tahoma,ui-sans-serif,system-ui,sans-serif;font-size:clamp(2.4rem,6vw,5.2rem);font-weight:700;line-height:1.16}.guide-stage{align-content:center;justify-items:center;gap:8px;min-height:220px;padding:28px 18px;display:grid}.guide-stage .thai-large{text-align:center;font-size:clamp(3.8rem,10vw,7.5rem)}.guide-reference{color:var(--muted);letter-spacing:0;margin:0;font-size:1.05rem;font-weight:850}.prompt{gap:24px;display:grid}.lesson-shell{border:1px solid var(--line);background:var(--card);border-radius:8px;width:min(960px,100%);padding:clamp(18px,4vw,32px);box-shadow:0 18px 50px #141f2b14}.lesson-header{border-bottom:1px solid var(--line);grid-template-columns:minmax(0,1fr) minmax(160px,260px);align-items:start;gap:20px;padding-bottom:18px;display:grid}.lesson-header h2{color:var(--ink);margin:6px 0 8px;font-size:clamp(2rem,4vw,3.3rem);line-height:1.04}.lesson-header p{color:var(--muted);margin:0;line-height:1.45}.lesson-progress{align-items:center;gap:5px;min-height:34px;padding-top:10px;display:flex}.lesson-progress span{background:color-mix(in srgb, var(--line) 76%, transparent);border-radius:999px;flex:8px;max-width:34px;height:8px}.lesson-progress span.complete{background:color-mix(in srgb, var(--accent) 76%, var(--paper))}.lesson-progress span.current{background:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb, var(--accent) 16%, transparent)}.lesson-stage{border:1px solid color-mix(in srgb, var(--line) 72%, transparent);background:color-mix(in srgb, var(--paper) 72%, var(--card));border-radius:8px;place-items:center;gap:18px;min-height:280px;padding:clamp(18px,4vw,32px);display:grid}.prompt-meta{flex-wrap:wrap;gap:8px;display:flex}.prompt-meta span{border:1px solid var(--line);min-height:30px;color:var(--muted);background:var(--card);border-radius:6px;align-items:center;padding:4px 9px;font-size:.85rem;display:inline-flex}.teacher-notes{border:1px solid var(--line);background:var(--card);border-radius:8px;width:min(620px,100%);padding:10px 12px}.teacher-notes summary{cursor:pointer;color:var(--muted);font-weight:800}.teacher-notes p{color:var(--ink);margin:10px 0 0;line-height:1.45}.prompt-technical-details dl{grid-template-columns:max-content minmax(0,1fr);gap:8px 14px;margin:12px 0 0;display:grid}.prompt-technical-details dt{color:var(--muted);font-weight:850}.prompt-technical-details dd{color:var(--ink);overflow-wrap:anywhere;margin:0}.guide-cues dl{grid-template-columns:max-content minmax(0,1fr);gap:8px 14px;margin:12px 0 0;display:grid}.guide-cues dt{color:var(--muted);font-weight:850}.guide-cues dd{color:var(--ink);overflow-wrap:anywhere;margin:0}.prompt-image{width:min(360px,100%);margin:0}.prompt-image-media{aspect-ratio:1;object-fit:contain;border:1px solid var(--line);background:var(--card);border-radius:8px;width:100%;height:auto;display:block}.audio-prompt{align-content:center;justify-items:center;gap:12px;width:min(520px,100%);min-height:160px;display:grid}.audio-prompt audio{width:min(440px,100%)}.audio-feedback{gap:10px;width:min(520px,100%);display:grid}.audio-feedback-panel{border:1px solid var(--line);background:var(--card);border-radius:8px;gap:12px;padding:12px;display:grid}.audio-issue-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 14px;display:grid}.audio-feedback textarea{resize:vertical;border:1px solid var(--line);width:100%;min-height:82px;color:var(--ink);font:inherit;border-radius:6px;padding:9px 10px}.audio-feedback-actions{justify-content:flex-end;gap:8px;display:flex}.audio-missing{border-left:4px solid var(--warning);background:color-mix(in srgb, var(--warning) 14%, var(--card));color:var(--ink);margin:0;padding:10px 12px;font-weight:800}.audio-status{color:var(--muted);margin:-4px 0 0;font-size:.88rem;font-weight:750}.thai-shadow{color:var(--muted);margin:0;font-family:Noto Sans Thai,Tahoma,ui-sans-serif,system-ui,sans-serif;font-size:1.2rem}.choice-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}.choice-button{border:1px solid var(--line);background:var(--card);min-height:74px;color:var(--ink);text-align:left;overflow-wrap:anywhere;border-radius:8px;padding:14px 16px;font-weight:750;line-height:1.25}.choice-button:hover{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}.choice-button:disabled{cursor:not-allowed;opacity:.58;box-shadow:none}.perception-clips{justify-items:center;gap:14px;margin:4px 0 10px;display:grid}.perception-clip-row{flex-wrap:wrap;justify-content:center;gap:14px;margin:0;padding:0;list-style:none;display:flex}.perception-clip{border:2px solid var(--line);background:var(--card);border-radius:12px;justify-items:center;gap:8px;min-width:116px;padding:16px 18px;transition:border-color .15s,box-shadow .15s,transform .15s,opacity .15s;display:grid}.perception-clip-tag{border:2px solid var(--line);width:38px;height:38px;color:var(--ink);border-radius:999px;place-items:center;font-size:1.05rem;font-weight:800;display:grid}.perception-clip-label{color:var(--muted);font-size:.92rem;font-weight:700}.perception-clip-playing{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb, var(--accent) 28%, transparent);transform:translateY(-2px)}.perception-clip-playing .perception-clip-tag{border-color:var(--accent);background:var(--accent);color:var(--card)}.perception-clip-playing .perception-clip-label{color:var(--ink)}.perception-clip-heard{opacity:.72}.perception-clip-wave{align-items:flex-end;gap:3px;height:16px;display:inline-flex}.perception-clip-wave i{background:var(--accent);opacity:.4;border-radius:2px;width:3px;height:5px}.perception-clip-wave.on i{opacity:1;animation:.7s ease-in-out infinite perception-wave}.perception-clip-wave.on i:nth-child(2){animation-delay:.18s}.perception-clip-wave.on i:nth-child(3){animation-delay:.36s}@keyframes perception-wave{0%,to{height:5px}50%{height:16px}}@media (prefers-reduced-motion:reduce){.perception-clip-wave.on i{height:12px;animation:none}.perception-clip-playing{transform:none}}.perception-clip-controls{align-items:center;min-height:34px;display:flex}.perception-status{color:var(--muted);font-size:.9rem;font-weight:750}.perception-play,.perception-replay{border:1px solid var(--line);background:var(--card);color:var(--ink);border-radius:999px;padding:7px 16px;font-size:.9rem;font-weight:700}.perception-play{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}.perception-replay:hover:not(:disabled),.perception-play:hover:not(:disabled){border-color:var(--accent)}.perception-replay:disabled{opacity:.5;cursor:not-allowed}.perception-prompt-q{color:var(--ink);text-align:center;margin:0 0 10px;font-weight:750}.ax-judgment,.abx-judgment{flex-wrap:wrap;justify-content:center;gap:18px;margin-top:4px;display:flex}.ax-button,.abx-button{border:1px solid var(--line);background:var(--card);min-width:150px;min-height:58px;color:var(--ink);border-radius:10px;justify-content:center;align-items:center;gap:8px;padding:12px 26px;font-size:1rem;font-weight:750;display:inline-flex}.ax-button:hover:not(:disabled),.abx-button:hover:not(:disabled){border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}.ax-button:disabled,.abx-button:disabled{opacity:.5;cursor:not-allowed}.key-hint{border:1px solid var(--line);background:color-mix(in srgb, var(--ink) 8%, transparent);min-width:20px;height:20px;color:var(--muted);border-radius:5px;place-items:center;padding:0 5px;font-size:.72rem;font-weight:800;display:grid}.adult-grade-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;width:min(680px,100%);display:grid}.adult-grade-button{border:1px solid var(--line);background:var(--bg-surface,#fff);min-height:82px;color:var(--ink);border-radius:8px;padding:14px 16px;font-size:1.05rem;font-weight:850;line-height:1.2;position:relative}.adult-grade-shortcut{letter-spacing:.05em;color:var(--muted);background:var(--bg-input,#fff6);border:1px solid var(--line);border-radius:4px;padding:1px 5px;font-size:.75rem;font-weight:700;line-height:1;position:absolute;top:6px;right:8px}.auto-advance-toggle{color:var(--muted);align-items:center;gap:8px;margin-top:8px;font-size:.85rem;display:inline-flex}.auto-advance-toggle input[type=checkbox]{margin:0}.adult-grade-button.again{background:color-mix(in srgb, var(--danger) 12%, var(--card));border-color:#d9a29b}.adult-grade-button.good{background:color-mix(in srgb, var(--success) 12%, var(--card));border-color:#94bf9d}.adult-grade-button.easy{background:color-mix(in srgb, var(--accent) 12%, var(--card));border-color:#8db1d4}.adult-grade-button:disabled{cursor:not-allowed;opacity:.58}.text-answer-form{grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:12px;width:min(620px,100%);display:grid}.text-answer-form label{color:var(--muted);gap:7px;font-size:.9rem;font-weight:800;display:grid}.text-answer-form input{border:1px solid var(--line);min-height:58px;color:var(--ink);background:var(--card);letter-spacing:0;border-radius:8px;padding:10px 12px;font-size:1.45rem;font-weight:750}.text-answer-form input:disabled{opacity:.58}.text-answer-form button{border:1px solid 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