@charset "UTF-8";
:root{--paper:#f5f4ef;--white:#fffefa;--ink:#253d39;--muted:#6a7771;--line:#dedfd6;--green:#174f4a;--light:#e8efea;--accent:#bd5c3e;--soft:#f7e9dd;--serif:Georgia,"Yu Mincho",serif;--pinyin-font:Arial,"Segoe UI","Noto Sans",sans-serif;font-family:"Segoe UI","Noto Sans JP","Yu Gothic UI",Meiryo,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer}button{color:inherit}a{color:var(--green)}button:disabled{cursor:not-allowed;opacity:.5}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,[tabindex]:focus-visible{outline:3px solid #c47c29;outline-offset:3px}button{border:0;background:none}svg{display:block}p{line-height:1.85}small{font-size:11px}.masthead{height:91px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;padding:0 4.5%;background:var(--white)}.brand{display:flex;align-items:center;gap:14px;text-decoration:none;font-size:17px;font-weight:700;letter-spacing:2px}.brand-mark{display:grid;place-items:center;width:45px;height:45px;border-radius:11px;background:var(--green);color:white;font-family:var(--serif);font-size:28px;font-weight:400;letter-spacing:0}.brand small{display:block;font-weight:400;letter-spacing:1.1px;color:var(--muted);margin-top:5px}.header-note{display:flex;align-items:center;gap:10px;font-size:12px;color:var(--muted)}.dot{height:7px;width:7px;background:#738e65;border-radius:50%}.edition{padding-left:24px;margin-left:15px;border-left:1px solid var(--line);font-size:10px;letter-spacing:1.4px}main{max-width:1600px;margin:auto;padding:40px 4.5% 0}.intro{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:29px}.eyebrow{font-size:10px;font-weight:600;letter-spacing:2px;color:var(--muted);margin:0 0 14px}.intro h1{font-family:var(--serif);font-size:35px;font-weight:500;letter-spacing:1px;margin:0 0 12px}.intro h1 span{color:var(--green)}.intro p:not(.eyebrow){font-size:13px;color:var(--muted);margin:0}.summary{display:flex;gap:25px;text-align:center;padding:0 9px}.summary div+div{border-left:1px solid var(--line);padding-left:25px}.summary strong{font-family:var(--serif);font-size:34px;font-weight:400;display:block;line-height:1.1}.summary span{font-size:11px;color:var(--muted);display:block;margin-top:8px}.search-bar{display:flex;gap:20px;align-items:center}.search-field{display:flex;align-items:center;gap:14px;padding:0 20px;height:56px;border:1px solid var(--line);background:var(--white);border-radius:9px;flex:1;box-shadow:0 2px 2px #203b3003}.search-field:focus-within{border-color:var(--green);box-shadow:0 0 0 2px #174f4a12}.search-field input{width:100%;border:0;outline:none;background:transparent;color:var(--ink);font-size:14px;min-width:0}.search-field input:focus-visible{outline:none}.search-field kbd{border:1px solid var(--line);border-radius:4px;padding:2px 7px;color:var(--muted)}.text-button{font-size:12px;color:var(--muted);padding:10px 0}.text-button:hover{color:var(--green);text-decoration:underline}.quick-links{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin:13px 0 29px;font-size:11px}.quick-links>span{color:var(--muted);margin-right:4px}.quick-links button{border:1px solid var(--line);border-radius:20px;padding:6px 11px;background:#fffefa;transition:background .15s}.quick-links button:hover{background:var(--light)}.quick-links small{color:var(--muted);margin-left:5px;font-size:10px}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:24px;align-items:start}.reference{min-width:0}.tabs{display:flex;gap:20px;min-height:45px;border-bottom:1px solid var(--line);padding:0 4px}.tabs button{padding:0 0 13px;white-space:nowrap;font-size:12px;color:var(--muted);border-bottom:2px solid transparent;margin-bottom:-1px}.tabs button[aria-current]{border-color:var(--green);color:var(--green);font-weight:700}.tabs small{font-size:10px;background:#e8e9e1;padding:2px 5px;border-radius:5px;margin-left:3px}.reference-body{padding-top:22px}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-bottom:14px}.section-heading h2{font-size:16px;letter-spacing:.5px;margin:0}.section-heading span{font-size:11px;color:var(--muted)}.groups{display:flex;flex-wrap:wrap;gap:6px}.groups button{font-size:11px;border:1px solid var(--line);padding:7px 12px;border-radius:6px;background:var(--white)}.groups button[aria-pressed="true"]{background:var(--green);color:white;border-color:var(--green)}.filters{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:13px}.filters label{display:flex;align-items:center;gap:5px;font-size:11px;color:var(--muted)}select{max-width:100%;background:var(--white);color:var(--ink);border:1px solid var(--line);border-radius:5px;padding:6px;font-size:12px}input[type=checkbox]{accent-color:var(--green)}.filter-bottom{display:flex;gap:16px;align-items:center;justify-content:space-between;margin:12px 0}.filter-bottom>div{display:flex;gap:12px;align-items:center}.filter-bottom label{font-size:11px;color:var(--muted)}.matrix-scroll{border:1px solid var(--line);border-radius:8px;background:var(--white);max-height:567px;overflow:auto;scrollbar-color:#a4b5a9 #f1f1e9;scrollbar-width:thin}.matrix{border-collapse:separate;border-spacing:0;min-width:100%;font-size:12px}.matrix caption{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.matrix th,.matrix td{padding:0;text-align:center;border-right:1px solid #e8e9e1;border-bottom:1px solid #e8e9e1;min-width:68px;height:36px}.matrix th{background:#eef0e8;font-weight:600;color:var(--green)}.matrix thead th{position:sticky;top:0;z-index:3;height:61px;padding:9px 8px}.matrix th small{display:block;font-family:"Segoe UI",sans-serif;color:#738479;font-size:10px;font-weight:400;margin-top:5px;white-space:nowrap}.matrix tbody th{position:sticky;left:0;z-index:2;min-width:58px;max-width:58px}.matrix thead th:first-child{left:0;z-index:4;min-width:58px}.matrix tbody th small{display:inline;margin-left:6px;font-size:10px}.matrix td button{display:block;width:100%;min-height:36px;padding:7px 6px;font-size:12px;white-space:nowrap}.matrix td button:hover{background:var(--light)}.matrix td button[aria-pressed="true"]{background:var(--green);color:white;box-shadow:inset 0 0 0 2px #174f4a}.matrix .cell-ipa{display:block;color:var(--muted);font-size:10px;margin-top:4px}.matrix [aria-pressed=true] .cell-ipa{color:#c9e2d8}.matrix .empty{color:#b8c0b5;background:#f8f8f3}.matrix .peripheral{color:#a26832}.matrix tr:hover td.empty{background:#f1f3eb}.table-hint{display:flex;justify-content:space-between;gap:10px;font-size:10px;color:var(--muted);margin:12px 0}.legend{display:flex;gap:12px}.legend span:first-child:before{content:"";display:inline-block;width:7px;height:7px;border:1px solid #9eadaa;margin-right:5px}.legend span:last-child{color:#a26832}.detail{background:var(--white);border:1px solid var(--line);border-radius:11px;overflow:hidden;position:sticky;top:20px}.detail-top{padding:24px 24px 21px;background:var(--green);color:#fffefa;position:relative}.detail-top .eyebrow{color:#b8d1c9;font-size:9px;margin-bottom:16px}.detail-top h2{font-family:var(--pinyin-font);font-size:53px;font-weight:400;margin:0 0 5px;line-height:1.2}.detail-ipa{font-family:"Segoe UI",sans-serif;font-size:22px;color:#d2e5d9;letter-spacing:1px}.detail-number{position:absolute;right:22px;top:22px;font-size:10px;letter-spacing:1px;color:#b8d1c9}.detail-content{padding:21px 22px}.decomposition{display:grid;grid-template-columns:1fr 22px 1fr;gap:8px;align-items:center;text-align:center;margin-bottom:18px}.decomposition>div{padding:10px;background:#f2f3ed;border-radius:6px}.decomposition small{color:var(--muted);font-size:10px;display:block}.decomposition strong{font-size:21px;display:block;margin:3px 0;font-weight:500}.decomposition .ipa{font-size:12px;color:var(--muted)}.rule-note{border-left:2px solid #adbdac;padding-left:12px;color:var(--muted);font-size:11px;line-height:1.8;margin:9px 0}.detail-separator{border:0;border-top:1px solid var(--line);margin:21px 0 18px}.mini-title{font-size:11px;display:flex;justify-content:space-between;align-items:center;margin:0 0 11px}.mini-title span{font-size:10px;color:var(--muted);font-weight:400}.tones{display:grid;grid-template-columns:repeat(5,1fr);gap:5px}.tone{border:1px solid var(--line);border-radius:6px;display:flex;flex-direction:column;align-items:center;padding:7px 2px;font-size:11px;background:white}.tone[aria-pressed=true]{border-color:var(--green);background:var(--light);color:var(--green);box-shadow:0 0 0 1px var(--green)}.tone svg{width:38px;height:25px;margin:3px 0}.tone small{font-size:9px;color:var(--muted)}.tone-note{font-size:10px;color:var(--muted);line-height:1.7;margin:10px 0 13px}.example{background:#f6f3eb;border-radius:6px;padding:11px 12px;margin-bottom:10px}.example .example-word{font-family:var(--serif);font-size:25px;letter-spacing:2px;margin:2px 0}.example mark{background:transparent;color:var(--green);border-bottom:2px solid #8aa997}.example .example-pinyin{font-size:12px;letter-spacing:.5px;color:var(--muted);margin:4px 0}.example small{font-size:9px;color:var(--muted)}.primary{display:flex;align-items:center;justify-content:center;gap:9px;padding:12px 18px;background:var(--green);color:white;border-radius:6px;font-size:12px}.play-row{display:flex;gap:6px}.play-row .primary{flex:1}.stop{border:1px solid var(--line);border-radius:6px;padding:0 12px;font-size:14px}.voice-status{font-size:10px;color:var(--muted);line-height:1.7;min-height:17px;margin:9px 0}.voice-settings{margin-top:13px;border-top:1px solid var(--line);padding-top:10px}.voice-settings summary{font-size:10px;color:var(--muted);cursor:pointer}.voice-settings label{font-size:10px;display:block;color:var(--muted);margin-top:12px}.voice-settings select{width:100%;margin-top:5px;font-size:10px}.speed-control{display:flex;align-items:center;gap:10px}.speed-control input{width:100%;accent-color:var(--green)}.audio-footnote{font-size:9px;color:var(--muted);line-height:1.7;margin:12px 0 0}.empty-state{padding:60px 20px;background:var(--white);text-align:center;border:1px solid var(--line);border-radius:8px}.empty-state h3{font-size:16px}.empty-state p{font-size:12px;color:var(--muted)}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(175px,1fr));gap:11px}.sound-card{border:1px solid var(--line);background:var(--white);border-radius:8px;padding:17px;text-align:left;display:flex;flex-direction:column;min-height:170px}.sound-card:hover{border-color:#98b3a5;background:#fcfdf8}.sound-card .card-symbol{font-size:25px;font-family:var(--serif);color:var(--green)}.sound-card .ipa{font-size:15px;color:var(--muted);margin-left:10px;font-family:"Segoe UI",sans-serif}.sound-card .note{font-size:11px;line-height:1.8;margin:11px 0;color:var(--muted)}.sound-card .card-foot{display:flex;align-items:center;justify-content:space-between;font-size:10px;margin-top:auto;color:var(--green);gap:8px}.sound-card .card-spelling{font-size:11px;margin-top:8px}.rules-list{display:grid;gap:14px}.rule-card{border:1px solid var(--line);border-radius:8px;padding:21px;background:var(--white)}.rule-card h3{font-size:14px;font-weight:600;margin:0 0 10px;display:flex;align-items:center;gap:12px}.rule-card .rule-index{font-family:var(--serif);font-size:21px;color:#a3aea1}.rule-card p{font-size:12px;color:var(--muted);margin:7px 0}.rule-examples{display:flex;gap:8px;flex-wrap:wrap;margin-top:13px}.rule-examples button{font-size:12px;padding:7px 11px;border-radius:5px;background:var(--light);color:var(--green)}.tone-guide{display:grid;grid-template-columns:repeat(5,1fr);gap:9px;margin:16px 0}.tone-guide button{padding:12px 4px;background:var(--light);border-radius:6px;font-size:12px}.tone-guide svg{width:65px;height:50px;margin:auto}.tone-guide small{display:block;color:var(--muted)}.method-note{display:grid;grid-template-columns:290px 1fr;align-items:center;gap:36px;border-top:1px solid var(--line);margin-top:40px;padding:28px 0}.method-note .eyebrow{font-size:9px;letter-spacing:1.7px}.method-note h2{font-family:var(--serif);font-size:18px;font-weight:500;margin:9px 0}.method-note p{font-size:11px;color:var(--muted);margin:0;line-height:2}footer{border-top:1px solid var(--line);padding:20px 0;display:flex;align-items:center;justify-content:space-between;font-size:10px;letter-spacing:1.5px;color:var(--muted)}footer small{margin-left:15px;font-size:9px;letter-spacing:0}dialog{max-width:650px;width:calc(100% - 32px);border:1px solid var(--line);border-radius:12px;background:var(--white);color:var(--ink);padding:30px;max-height:85vh}dialog::backdrop{background:#142e2b80}dialog h2{font-size:21px;font-family:var(--serif)}dialog h3{font-size:14px;margin-top:25px}dialog p,dialog li{font-size:12px;line-height:1.9;color:var(--muted)}dialog li{margin:8px 0}.dialog-close{position:absolute;right:14px;top:9px;font-size:27px;color:var(--muted)}dialog .primary{margin-top:22px}.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip{position:absolute;top:-60px;left:20px;padding:10px;background:white;z-index:20}.skip:focus{top:10px}
@media(min-width:1500px){.workspace{grid-template-columns:minmax(0,1fr) 360px}.intro h1{font-size:39px}.matrix th,.matrix td{min-width:73px}}
@media(max-width:1100px){main{padding:30px 3% 0}.masthead{padding:0 3%}.workspace{grid-template-columns:minmax(0,1fr) 310px;gap:18px}.tabs{gap:14px}.tabs button{font-size:11px}.intro h1{font-size:29px}.summary{gap:15px}.summary div+div{padding-left:15px}.detail-content{padding:18px}.detail-top{padding:22px}.summary strong{font-size:29px}.filter-bottom{align-items:flex-start;gap:8px;flex-wrap:wrap}}
@media(max-width:800px){.header-note{display:none}.masthead{height:77px}.intro{align-items:flex-start}.intro h1{font-size:27px;line-height:1.6}.intro h1 span{display:block}.summary{gap:10px;padding-top:32px}.summary div+div{padding-left:10px}.summary strong{font-size:25px}.summary span{font-size:9px}.intro p:not(.eyebrow){max-width:370px;line-height:1.8;font-size:11px}.eyebrow{font-size:8px}.workspace{grid-template-columns:1fr}.detail{position:static;display:grid;grid-template-columns:250px 1fr}.detail-content{padding:23px}.detail-top{padding:30px 24px}.matrix-scroll{max-height:440px}.tabs{gap:20px}.tabs button{font-size:12px}.quick-links{margin-bottom:23px}.method-note{grid-template-columns:1fr;gap:10px;padding:22px 0}.search-bar{gap:12px}.search-field{padding:0 12px}.search-field input{font-size:12px}.search-field kbd{display:none}}
@media(max-width:520px){main{padding:26px 16px 0}.masthead{padding:0 18px}.intro{display:block}.intro h1 span{display:inline}.intro h1{font-size:25px}.summary{justify-content:flex-start;padding:18px 0 0;gap:22px}.summary div{display:flex;align-items:center;gap:7px}.summary div+div{padding-left:22px}.summary span{margin:0}.summary strong{font-size:23px}.intro{margin-bottom:20px}.search-bar{display:block}.search-bar>.text-button{padding:8px 0 0;display:block;margin-left:auto;font-size:10px}.quick-links{gap:6px;margin-top:10px}.quick-links>span{width:100%;margin-bottom:3px}.quick-links button{padding:5px 9px}.tabs{gap:16px;overflow:auto}.tabs button{font-size:11px}.tabs small{display:none}.detail{display:block}.detail-top{padding:20px 24px}.detail-top h2{font-size:45px}.detail-top .eyebrow{margin-bottom:9px}.detail-content{padding:22px}.section-heading h2{font-size:15px}.groups button{padding:6px 9px;font-size:10px}.card-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.sound-card{padding:13px}.sound-card .ipa{font-size:13px;margin-left:6px}.sound-card .card-symbol{font-size:24px}.sound-card .note{font-size:10px}.table-hint{flex-direction:column;gap:5px}.tone-guide{gap:5px}.tone-guide svg{width:48px}.rule-card{padding:16px}.tone-guide button{font-size:10px}.tone-guide small{font-size:9px}footer{gap:12px;flex-wrap:wrap}footer small{display:block;margin:8px 0 0}.method-note{margin-top:26px}dialog{padding:23px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

.detail-top .reading-caption{font-size:10px;letter-spacing:.6px;margin:0 0 3px;color:#c8dfd4}
.detail-top .ipa-caption{font-size:10px;line-height:1.6;margin:6px 0 0;color:#c8dfd4}
.third-tone-panel{margin:18px 0 14px;padding-top:15px;border-top:1px solid var(--line)}
.third-tone-panel .mini-title{flex-wrap:wrap;gap:5px;font-size:11px}
.third-tone-panel .mini-title span{font-size:9px}
.third-tone-options{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}
.third-tone-options button{border:1px solid var(--line);border-radius:6px;background:var(--white);padding:9px 3px;display:flex;flex-direction:column;align-items:center;gap:3px}
.third-tone-options strong{font-size:10px;font-weight:600;white-space:nowrap}
.third-tone-options svg{width:49px;height:32px}
.third-tone-options small{font-size:10px;color:var(--muted)}
.third-tone-options button[aria-pressed=true]{border-color:var(--green);box-shadow:0 0 0 1px var(--green);background:var(--light);color:var(--green)}
.third-tone-panel .tone-note{margin-bottom:0}
.example-realization{border-top:1px solid var(--line);padding-top:8px;margin-top:10px}
.example-realization strong{display:block;color:var(--green);font-size:12px;line-height:1.7;margin-top:3px}
.example-realization strong span{white-space:nowrap}
.example-realization p{font-size:10px;color:var(--muted);margin:4px 0 0;line-height:1.7}
.example-demo{display:block;font-size:11px;color:var(--green);padding:8px 0 0;text-decoration:underline;text-underline-offset:3px}
.context-caution{font-size:9px}
.third-guide-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:17px 0}
.third-guide-grid button{background:var(--light);border:1px solid var(--line);border-radius:7px;padding:15px 6px;color:var(--green)}
.third-guide-grid strong{font-size:13px;display:block}
.third-guide-grid svg{width:85px;height:61px;margin:8px auto}
.third-guide-grid span{font-size:12px;display:block}
.third-guide-grid small{display:block;font-size:11px;color:var(--muted);margin-top:7px}
.third-context-notes{padding-left:20px;font-size:12px;color:var(--muted);line-height:1.9}
.third-context-notes li+li{margin-top:7px}
@media(max-width:520px){.third-guide-grid{gap:6px}.third-guide-grid strong{font-size:11px}.third-guide-grid svg{width:65px}.third-guide-grid span,.third-guide-grid small{font-size:10px}}

@media(max-width:520px){.tabs{overflow-x:auto;overflow-y:hidden;scrollbar-width:none;min-height:46px}}

/* Keep tone marks in one Latin font, including stacked marks on ü / ê. */
.example .example-pinyin,.tone small,.third-guide-grid small,.search-field input{font-family:var(--pinyin-font)}

.voice-help{margin-top:13px;border-top:1px solid var(--line);padding-top:10px;font-size:11px;color:var(--muted);line-height:1.8}.voice-help summary{cursor:pointer;font-size:11px;color:var(--green)}.voice-help p{margin:9px 0}.voice-help strong{color:var(--ink)}.voice-help ol{padding-left:20px;margin:8px 0}.voice-help li{margin:8px 0}