:root{--ink:#233e3b;--teal:#075666;--muted:#566c66;--cream:#f8f6ef;--paper:#fffef9;--line:#d9dfd3;--accent:#a5483e;--green:#526d40;--wash:#edf2e8}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:15px}body{margin:0;background:var(--cream);color:var(--ink);font:15px/1.6 system-ui,-apple-system,'Segoe UI',sans-serif}button,input,select{font:inherit;color:inherit}button,select{cursor:pointer}button{border:1px solid var(--line);background:var(--paper);padding:9px 14px;border-radius:7px;min-height:44px}button:hover{border-color:var(--teal);background:#e9efe6}button:disabled{opacity:.55;cursor:default}a{color:var(--teal);text-underline-offset:4px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #b97522;outline-offset:3px}input,select{max-width:100%;min-width:0;background:var(--paper);border:1px solid #b8c6ba;border-radius:6px;min-height:44px;padding:8px 10px}input{width:100%}label{display:block;font-size:12px;font-weight:650;color:var(--muted)}label select{display:block;width:100%;margin-top:4px}h1,h2,h3,p{margin-top:0}h1,h2,h3{font-family:Georgia,'Times New Roman',serif;line-height:1.12;font-weight:500}h2{font-size:27px;margin-bottom:12px}h3{font-size:22px}p{margin-bottom:12px}header,main,footer{max-width:1440px;margin:auto}header{display:flex;align-items:center;gap:22px;border-bottom:1px solid var(--line);padding:12px 42px}header img{display:block;object-fit:contain;width:130px;height:65px}header nav{margin-left:auto;display:flex;align-items:center;gap:22px;font-size:13px}header nav a{text-decoration:none}.brand-context{font-size:10px;letter-spacing:.12em}main{padding:0 42px}.intro{display:flex;justify-content:space-between;gap:30px;align-items:center;padding:42px 0 32px}.eyebrow{font-size:10px;font-weight:750;letter-spacing:.14em;color:var(--accent);margin-bottom:10px}.intro h1{font-size:clamp(44px,5vw,70px);letter-spacing:-2.5px;margin-bottom:12px}.title-dot{color:var(--accent)}.tagline{font-size:23px;margin:0;color:var(--muted)}.tagline em{font-family:Georgia,serif;color:var(--teal)}.subtitle{font-size:14px;color:var(--muted);margin:8px 0 0}.intro-note{max-width:300px;position:relative;padding-left:53px;font-size:14px;color:var(--muted)}.mini-wave{position:absolute;left:0;top:-16px;font-size:64px;color:var(--teal)}.intro-note a{font-size:12px;font-weight:650}.review{font-size:11px;color:#6e573b;padding:9px 13px;background:#efe9d9;border-left:3px solid #a28a4c}.review a{color:inherit}.lab-nav{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:15px;padding:10px 0 16px}.lab-nav nav{display:flex;gap:5px}.lab-nav nav button{border-color:transparent;background:transparent;font-weight:650;padding:9px 23px}.lab-nav nav button[aria-current=page]{background:var(--teal);color:white}.lab-layout{display:grid;grid-template-columns:255px minmax(0,1fr);gap:34px;padding-top:26px}.library{border-right:1px solid var(--line);padding-right:25px}.library-heading h2{font-size:26px}.search-wrap{display:flex;margin:5px 0 14px;position:relative}.search-wrap input{padding-right:36px}.search-wrap button{position:absolute;right:0;top:0;border:0;background:none;font-size:20px;padding:5px 10px}.filter-details{margin:14px 0 0;font-size:12px}.filter-details label{margin-top:8px}summary{cursor:pointer;min-height:35px;padding:5px 0;color:var(--teal);font-weight:650}.browse-list{max-height:700px;overflow:auto;scrollbar-width:thin;padding-right:3px}.word-row{display:block;width:100%;text-align:left;border:0;border-bottom:1px solid var(--line);border-radius:0;background:none;padding:12px 9px}.word-row.active{background:#e4ede3;border-left:3px solid var(--teal)}.word-row strong{font-size:20px;font-weight:500}.word-row .py{float:right;font-size:13px;color:var(--teal);padding-top:4px}.word-row small{display:block;color:var(--muted);line-height:1.35;font-size:12px}.sound-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;margin-bottom:20px}.sound-grid button{font-size:19px;color:var(--teal);padding:8px}.group-name{font-size:11px;letter-spacing:.04em;color:var(--muted);margin:16px 0 7px}.sound-grid button.active{color:white;background:var(--teal)}#result-count{font-size:11px;color:var(--muted);margin:15px 0 8px}.recent{border-top:1px solid var(--line);margin-top:25px;padding-top:10px;font-size:12px}.recent button{font-size:11px;margin:4px 3px 0 0;padding:6px 8px}.workbench{min-width:0}.selection{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:8px 0 23px}.word-title{font-family:system-ui;font-size:44px;line-height:1.3;margin:0 0 5px;font-weight:500;overflow-wrap:anywhere}.word-pinyin{font-size:23px;color:var(--teal);margin:0}.clue{font-size:13px;color:var(--accent);margin:0}.meaning{font-size:15px;color:var(--muted);margin:2px 0 5px}.meta{font-size:11px;color:var(--muted)}.selection-actions{display:flex;flex-direction:column;align-items:flex-end;gap:8px;max-width:220px;text-align:right}.primary{background:var(--teal);border-color:var(--teal);color:white;font-weight:650}.primary:hover{background:#104752;color:white}.selection-actions a{font-size:12px}.selection-actions small{font-size:10px;color:var(--muted)}.actions{display:flex;flex-wrap:wrap;gap:7px}.actions button{font-size:12px}.syllables{display:flex;flex-wrap:wrap;gap:5px;margin:12px 0 0}.syllables button{padding:6px 13px;color:var(--teal)}.syllables button.active{background:var(--wash);border-color:var(--teal)}.anatomy-panel{background:var(--paper);border:1px solid var(--line);border-radius:13px;overflow:hidden}.panel-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:22px 24px 0}.panel-heading h2{font-size:25px}.panel-heading button{font-size:12px}.anatomy-layout{display:grid;grid-template-columns:1.3fr 1fr;min-width:0}.visual-stage{padding:0 10px 8px;position:relative;background:radial-gradient(ellipse at center,#f3f2e8 0%,transparent 67%)}.tract{display:block;width:100%;max-height:410px}.sound-explainer{padding:17px 25px 20px 7px;align-self:center}.sound-explainer h3{font-family:system-ui;font-size:20px;margin-bottom:10px}.sound-explainer p{font-size:14px;line-height:1.75}.chips{display:flex;flex-wrap:wrap;gap:7px;margin:12px 0}.chips button{font-size:16px;border-bottom:3px solid var(--teal);padding:7px 11px}.chips button:last-child{border-bottom-color:var(--accent)}.chips button.active{background:#e4ede5}.stage-controls{display:flex;align-items:center;gap:6px;border-top:1px solid var(--line);padding:13px 20px;flex-wrap:wrap}.stage-controls button{font-size:12px;padding:6px 10px}.stage-controls button[aria-pressed=true]{background:var(--teal);color:white}.stage-controls .replay{margin-left:auto}.stage-caption{font-size:10px;color:var(--muted);padding:0 22px 13px;margin:0}.tone-plot{width:150px;height:112px;display:block}.tone-detail .tone-plot{width:100%;height:235px}.detail-box{font-size:12px!important;background:var(--wash);border-radius:6px;padding:12px}.note{font-size:11px!important;color:var(--muted)}.builder{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:23px 0 13px;margin:27px 0}.builder h2{font-size:24px}.builder-controls{display:grid;grid-template-columns:1fr auto 1fr 1.3fr auto;align-items:end;gap:9px}.builder-controls>span{padding-bottom:10px}.builder-controls button{white-space:nowrap}.builder p:last-child{font-size:12px;color:var(--muted);margin:10px 0 0}.comparison .panel-heading{padding:0;align-items:center}.comparison .panel-heading select{width:130px}.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.compare-card{padding:15px;background:#eef1e7;border-radius:9px;border:1px solid var(--line);min-width:0}.compare-card h3{font-size:28px;display:flex;justify-content:space-between;align-items:center;margin-bottom:0}.compare-card .tract{max-height:210px}.compare-card p{font-size:12px}.compare-card .actions button{font-size:11px}.compare-controls{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:12px}.compare-controls button{font-size:12px}.compare-controls span{font-size:11px;color:var(--muted)}.examples{margin:30px 0}.examples h2{font-size:25px}.example-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.example-card{text-align:left;min-width:0;display:block;padding:12px}.example-card strong{display:block;font-size:24px;font-weight:500}.example-card span{display:block;color:var(--teal);font-size:13px}.example-card small{display:block;font-size:11px}.about{display:grid;grid-template-columns:1fr 1.2fr;gap:70px;border-top:1px solid var(--line);margin-top:35px;padding:40px 0}.about p{font-size:13px;color:var(--muted)}.about details{border-bottom:1px solid var(--line);padding:6px 0}.about summary{font-size:13px}.about h2{font-size:30px}footer{padding:22px 42px 85px;border-top:1px solid var(--line);display:flex;gap:22px;justify-content:space-between;font-size:10px;letter-spacing:.06em}.audio-dock{position:fixed;bottom:15px;left:50%;transform:translateX(-50%);background:var(--teal);color:white;border-radius:10px;padding:10px 12px 10px 20px;display:flex;gap:20px;align-items:center;box-shadow:0 6px 24px #173f3933;z-index:5;max-width:90vw;font-size:13px}.audio-dock button{background:transparent;color:white;border-color:#89a7a8}#toast:not(:empty){position:fixed;bottom:90px;left:50%;transform:translateX(-50%);background:#283e35;color:white;max-width:90vw;padding:12px 20px;border-radius:8px;z-index:7;font-size:13px}#route-message:not(:empty){padding:12px;background:#eee5d7;font-size:12px}.hint{font-size:11px;padding:4px 7px;min-height:34px;margin-bottom:10px}.skip{position:absolute;top:-100px;left:10px;z-index:20;background:white;padding:15px}.skip:focus{top:10px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}[hidden]{display:none!important}.moving .airflow{animation:flow 1s linear infinite}@keyframes flow{to{stroke-dashoffset:-30}}body.instructor .intro,body.instructor .library,body.instructor .lab-nav,body.instructor .builder,body.instructor .comparison,body.instructor .about,body.instructor .examples{display:none}body.instructor .lab-layout{grid-template-columns:1fr;max-width:1150px;margin:auto}body.instructor .word-title{font-size:60px}body.instructor .tract{max-height:560px}body.instructor .sound-explainer p{font-size:22px}body.instructor .anatomy-panel h2{font-size:32px}body.instructor .stage-controls button{font-size:17px}body.instructor .sound-explainer h3{font-size:30px}
@media(max-width:1100px){main{padding:0 25px}header{padding:8px 25px}.brand-context{display:none}.lab-layout{grid-template-columns:220px minmax(0,1fr);gap:22px}.library{padding-right:18px}.anatomy-layout{grid-template-columns:1fr}.visual-stage .tract{max-height:360px}.sound-explainer{padding:0 23px 18px}.sound-explainer .tone-plot{float:right;width:100px;height:80px}.builder-controls{grid-template-columns:1fr auto 1fr}.builder-controls label:nth-of-type(3){grid-column:1/3}.comparison .panel-heading{align-items:start}.intro-note{max-width:240px}.example-grid{grid-template-columns:1fr 1fr}}
@media(max-width:760px){main{padding:0 18px}header{padding:8px 18px;gap:8px}header img{width:106px;height:53px}header nav{gap:10px;font-size:11px}header button{font-size:11px;padding:6px 10px}.intro{padding:27px 0 20px}.intro h1{font-size:47px}.intro-note{display:none}.tagline{font-size:21px}.lab-nav{flex-wrap:wrap;padding-bottom:12px;gap:9px}.lab-nav nav{width:100%;justify-content:space-between}.lab-nav nav button{padding:8px 15px}#saved-toggle{font-size:11px;min-height:34px;padding:5px 10px}.lab-layout{display:flex;flex-direction:column;gap:20px;padding-top:18px}.library{border-right:0;padding:0}.library-heading{display:none}.library>label{margin-top:6px}.browse-list{max-height:235px;border:1px solid var(--line);border-radius:7px}.word-row{padding:10px 12px}.filter-details{margin-top:8px}.recent{margin:10px 0 0;padding-top:5px}.sound-grid{grid-template-columns:repeat(6,1fr);padding:0 7px}.group-name{padding:0 9px}.selection{padding:10px 0 20px;gap:8px;align-items:start}.word-title{font-size:36px}.word-pinyin{font-size:22px}.selection-actions{max-width:155px}.selection-actions .actions button{padding:5px 9px}.selection-actions .primary{font-size:12px;padding:8px 10px}.anatomy-layout{grid-template-columns:1fr}.panel-heading{padding:17px 16px 0}.panel-heading h2{font-size:22px}.panel-heading button{font-size:11px;padding:5px 9px}.visual-stage{padding:0}.tract{max-height:350px}.sound-explainer{padding:0 17px 15px}.stage-controls{padding:10px;gap:4px}.stage-controls button{font-size:11px;padding:6px 8px}.stage-caption{padding:0 14px 12px}.builder-controls{gap:7px}.builder-controls select{font-size:12px}.compare-grid{grid-template-columns:1fr 1fr;gap:8px}.compare-card{padding:10px}.compare-card .tract{max-height:170px}.compare-card p{font-size:11px}.compare-card h3{font-size:23px}.compare-card h3 button{font-size:10px;padding:5px;min-height:34px}.compare-card .actions button{padding:5px;min-height:38px}.about{grid-template-columns:1fr;gap:15px;padding-top:25px}.about h2{font-size:27px}footer{padding:20px 18px 90px;flex-wrap:wrap}.review{font-size:10px}.selection-actions small{max-width:140px}.sound-grid button{font-size:16px;padding:6px}.audio-dock{width:calc(100% - 30px);justify-content:space-between;font-size:12px}body.instructor .sound-explainer p{font-size:18px}body.instructor .word-title{font-size:44px}}
@media(max-width:430px){.compare-grid{grid-template-columns:1fr}.compare-card .tract{max-height:230px}.compare-card p{font-size:13px}.intro h1{font-size:42px}.sound-grid{grid-template-columns:repeat(5,1fr)}.selection-actions{max-width:135px}.word-title{font-size:32px}.panel-heading h2{font-size:20px}.lab-nav nav button{padding:8px 13px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}

/* Explicit, short user-started playback can override reduced motion within this panel only. */
#anatomy-content.motion-opt-in .moving .airflow{animation:flow 1s linear infinite!important}
.pitch-progress{stroke-dasharray:1;stroke-dashoffset:1;animation:pitch-trace 3.6s linear forwards}
#anatomy-content.motion-opt-in .pitch-progress{animation:pitch-trace 3.6s linear forwards!important}
@keyframes pitch-trace{to{stroke-dashoffset:0}}

.mouth-views{display:flex;justify-content:center;gap:5px;margin:12px 0}.mouth-views button{font-size:12px;padding:5px 14px}.mouth-views [aria-pressed=true]{background:var(--teal);color:white}.anatomy-views{display:grid;align-items:center;grid-template-columns:1fr;min-width:0}.view-both{grid-template-columns:1.15fr 1fr}.view-front .side-view,.view-side .front-view{display:none}.front-mouth{margin:0;text-align:center}.front-mouth svg{display:block;width:100%;max-height:340px}.front-mouth figcaption{font-size:12px;color:var(--teal);padding:0 5px}.mouth-note{font-size:11px;color:var(--muted);text-align:center;margin:12px 10px}.view-both .tract{min-width:0}.view-both .front-mouth figcaption{font-size:10px}
@media(min-width:1101px){.anatomy-layout:has(.view-both){grid-template-columns:1fr}.anatomy-layout:has(.view-both) .sound-explainer{padding:15px 24px}.view-both .tract{max-height:340px}}

.tone-practice{margin-top:14px;padding-top:14px;border-top:1px solid var(--line)}.tone-forms{display:flex;flex-wrap:wrap;gap:6px;margin:10px 0}.tone-forms span{border:1px solid var(--line);border-radius:6px;padding:6px 10px;font-size:19px}.tone-forms small{font-size:10px;color:var(--muted)}.tone-forms .playing{background:var(--teal);color:white;border-color:var(--teal)}.tone-forms .playing small{color:white}

/* Keep the destination of See all matching words visible on phones too. */
@media(max-width:760px){.library-heading{display:block}.library-heading .eyebrow{display:none}.library-heading h2{font-size:24px;margin:0 0 12px}}