:root{
  --ink:#17243c;--paper:#faf8f3;--card:#ffffff;
  --brand:#f35b3f;--accent:#b74325;--accent-hover:#96351d;
  --accent-soft:#fff0e7;--accent-line:#d9876c;
  --blue:#2b5186;--blue-soft:#e9eff8;--soft:#f0f3f8;
  --nav-soft:#263955;--nav-text:#c6d3e6;--nav-accent:#ffb68f;
  --muted:#58677e;--line:#d9dfe8;--control:#8290a6;
  --success:#315c94;--success-soft:#e7effb;
  --warm:#fff0d9;--warm-ink:#744624;
  --danger:#a63435;--danger-soft:#fdebed;
  --violet:#6b467f;--violet-soft:#f0eaf6;
  --shadow:0 18px 50px rgba(25,40,64,.10)
}
    *{box-sizing:border-box} body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.45 Inter,ui-sans-serif,system-ui,-apple-system,"Noto Sans SC",sans-serif}button{font:inherit;color:inherit}button:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
    .shell{min-height:100vh;display:grid;grid-template-columns:230px 1fr}.side{background:var(--ink);color:white;padding:28px 20px;display:flex;flex-direction:column;position:sticky;top:0;height:100vh}.brand{display:flex;align-items:center;gap:11px;font-weight:850;font-size:1.15rem}.mark{width:38px;height:38px;border-radius:11px;background:var(--brand);display:grid;place-items:center;font-size:25px}.nav{display:grid;gap:8px;margin-top:38px}.nav button{border:0;background:transparent;color:var(--nav-text);padding:12px 13px;text-align:left;border-radius:12px;cursor:pointer;font-weight:700}.nav button.active,.nav button:hover{background:var(--nav-soft);color:white}.nav .ico{display:inline-block;width:28px}.streak{margin-top:auto;background:var(--nav-soft);border-radius:17px;padding:15px}.streak b{font-size:1.5rem}.streak small{display:block;color:var(--nav-text);margin-top:3px}
    main{padding:30px 38px 50px;max-width:1200px;width:100%;margin:auto}.top{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:24px}.top h1{font-size:clamp(1.7rem,4vw,2.7rem);letter-spacing:-.045em;margin:0}.top p{margin:5px 0 0;color:var(--muted)}.progress{min-width:180px}.progress-line{height:9px;background:var(--soft);border-radius:9px;overflow:hidden}.progress-line span{display:block;height:100%;background:var(--accent);width:0;transition:.4s}.progress small{display:block;text-align:right;margin-top:6px;color:var(--muted)}
    .workspace{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(290px,.65fr);gap:22px}.learn-card{background:var(--card);border:1px solid var(--line);border-radius:28px;min-height:530px;box-shadow:var(--shadow);position:relative;overflow:hidden;padding:28px}.tag{display:inline-flex;align-items:center;gap:7px;background:var(--blue-soft);border-radius:999px;padding:7px 12px;font-size:.82rem;font-weight:800}.tag i{width:8px;height:8px;background:var(--accent);border-radius:50%}.stage{height:285px;display:grid;place-items:center;position:relative}.hanzi{font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;font-size:clamp(9rem,20vw,13rem);font-weight:800;line-height:1;color:var(--ink);cursor:pointer;user-select:none;filter:drop-shadow(7px 9px 0 rgba(255,196,77,.45));transition:.2s}.hanzi:hover{transform:translateY(-4px) rotate(-1deg)}.spark{position:absolute;width:68%;height:68%;border:2px dashed var(--accent);border-radius:48% 52% 55% 45%;transform:rotate(-9deg);opacity:.25;pointer-events:none}.meaning{text-align:center}.meaning h2{font-size:2rem;margin:0}.meaning .pinyin{color:var(--accent);font-weight:850;font-size:1.15rem;margin-left:8px}.meaning p{max-width:530px;margin:10px auto 0;color:var(--muted)}.actions{display:flex;align-items:center;justify-content:center;gap:10px;margin-top:21px}.round,.primary{border:0;cursor:pointer}.round{width:44px;height:44px;border-radius:50%;background:var(--soft);font-size:1.2rem}.primary{background:var(--accent);color:white;border-radius:13px;padding:12px 18px;font-weight:800}.primary:hover:not(:disabled){background:var(--accent-hover)}
    .panel{display:grid;gap:16px;align-content:start}.info{background:var(--warm);border-radius:23px;padding:22px}.info h3,.queue h3{margin:0 0 10px}.info p{margin:0;color:var(--warm-ink)}.parts{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}.parts span{background:rgba(255,255,255,.62);padding:7px 10px;border-radius:10px;font-weight:800}.queue{background:white;border:1px solid var(--line);border-radius:23px;padding:20px}.queue-head{display:flex;justify-content:space-between;align-items:center}.queue-head small{color:var(--muted)}.tiles{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:14px}.tile{aspect-ratio:1;border:1px solid var(--line);background:var(--card);border-radius:13px;font-size:1.7rem;cursor:pointer}.tile.current{background:var(--accent);color:white;border-color:var(--accent)}.tile.mastered{border-color:var(--accent);box-shadow:inset 0 -4px var(--accent)}
    .quiz{display:none;background:white;border:1px solid var(--line);border-radius:28px;padding:clamp(22px,5vw,46px);box-shadow:var(--shadow);max-width:760px;margin:auto;text-align:center}.quiz.show{display:block}.quiz .prompt-char{font-size:8rem;line-height:1.2;margin:20px}.choices{display:grid;grid-template-columns:1fr 1fr;gap:12px;max-width:570px;margin:22px auto}.choice{padding:16px;border:2px solid var(--line);background:white;border-radius:15px;font-weight:800;cursor:pointer}.choice:hover{border-color:var(--accent)}.choice.good{background:var(--success-soft);border-color:var(--success)}.choice.bad{background:var(--danger-soft);border-color:var(--accent)}.feedback{min-height:30px;font-weight:800}.deck{display:none}.deck.show{display:block}.deck-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:14px}.deck-card{background:white;border:1px solid var(--line);border-radius:18px;padding:18px}.deck-card b{font-size:3rem}.deck-card span{display:block;color:var(--accent);font-weight:800}.deck-card small{color:var(--muted)}
    @media(max-width:820px){.shell{display:block}main{padding:22px 16px 36px}.workspace{grid-template-columns:1fr}.top{align-items:flex-start}.progress{min-width:120px}.learn-card{padding:20px;min-height:490px}.stage{height:235px}.panel{grid-template-columns:1fr}.choices{grid-template-columns:1fr}.tiles{grid-template-columns:repeat(6,1fr)}}
    @media(max-width:480px){.top{display:block}.progress{margin-top:14px}.tiles{grid-template-columns:repeat(4,1fr)}.hanzi{font-size:9rem}.nav button{font-size:.7rem}.nav .ico{font-size:1rem}.learn-card{border-radius:22px}}
  [hidden]{display:none!important}button,input,select{font:inherit}button{touch-action:manipulation}button:disabled{opacity:.48;cursor:default}input[type=search],select{border:1px solid var(--control);border-radius:10px;padding:10px;background:#fff;color:var(--ink);max-width:100%}input[type=search]{width:100%}input:focus-visible,select:focus-visible,a:focus-visible{outline:3px solid var(--accent);outline-offset:3px}a{color:var(--blue)}.toolbar{margin-bottom:22px}.levels{display:flex;gap:10px;flex-wrap:wrap}.levels button{border:1px solid var(--line);border-radius:14px;padding:12px 20px;background:white;text-align:left;font-weight:800;cursor:pointer}.levels button span{display:block;font-size:.85rem;font-weight:500}.levels button[aria-pressed=true]{background:var(--ink);color:white;border-color:var(--ink)}.edition{font-size:.875rem;color:var(--muted);margin:10px 0}.card-top{display:flex;justify-content:space-between;gap:10px;align-items:center}.card-top small{color:var(--muted);font-size:.875rem}.word-heading{text-align:center;margin-top:16px}.word-heading h2{font-size:clamp(2.1rem,6vw,3.4rem);line-height:1.4;margin:0;overflow-wrap:anywhere}.pinyin{color:var(--accent);font-weight:750;font-size:1.15rem;margin:3px 0}.word-heading #meaning{font-size:1.2rem;margin:5px 0}.audio-actions{display:flex;justify-content:center;gap:8px;flex-wrap:wrap;margin-top:16px}.secondary{border:1px solid var(--control);border-radius:11px;padding:10px 14px;background:white;cursor:pointer}.secondary:hover:not(:disabled){background:var(--blue-soft)}.context{font-size:.9rem;color:var(--muted);text-align:center}.character-tabs{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin:16px 0 12px}.character-tabs button{background:var(--soft);border:2px solid transparent;padding:6px 15px;border-radius:10px;font-size:1.5rem;cursor:pointer}.character-tabs button[aria-pressed=true]{border-color:var(--accent);background:var(--accent-soft)}.writing-area{display:flex;justify-content:center}#writer{width:260px;height:260px;border:1px solid var(--control);background-color:var(--card);background-image:linear-gradient(to right,transparent calc(50% - .5px),var(--line) calc(50% - .5px),var(--line) calc(50% + .5px),transparent calc(50% + .5px)),linear-gradient(to bottom,transparent calc(50% - .5px),var(--line) calc(50% - .5px),var(--line) calc(50% + .5px),transparent calc(50% + .5px));border-radius:8px;overflow:hidden}#writer svg{display:block;width:100%;height:100%}#stroke-status{font-size:.9rem;min-height:24px;text-align:center;color:var(--muted);margin:10px 0}.writing-controls{display:flex;justify-content:center;gap:8px;flex-wrap:wrap}.writing-options{display:flex;justify-content:center;align-items:center;gap:14px;flex-wrap:wrap;margin-top:16px;font-size:.875rem}.writing-options select{padding:5px}.writing-options input{accent-color:var(--accent)}.actions{border-top:1px solid var(--line);padding-top:20px}.round{flex-shrink:0}.learn-card{min-width:0}.workspace{grid-template-columns:minmax(0,1.2fr) minmax(285px,.8fr)}.tiles{grid-template-columns:repeat(3,minmax(0,1fr))}.tile{font-size:1.25rem;padding:8px 3px;aspect-ratio:auto;min-height:60px;overflow-wrap:anywhere}.tile.current{outline:2px solid var(--accent);outline-offset:2px}.tile.mastered{box-shadow:inset 0 -4px var(--success)}.search-label{display:block;font-size:.9rem;margin:10px 0 6px}.pagination{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:12px}.pagination small{font-size:.875rem}.parts span{font-size:1.35rem}.memory-note{font-size:.875rem!important;margin-top:14px!important}.voice-panel label{display:block;margin-bottom:5px}.voice-panel select{width:100%}.voice-panel p{font-size:.875rem}.voice-panel small{color:var(--muted);font-size:.875rem;display:block}.streak b{font-size:1.3rem}.quiz .prompt-char{font-size:clamp(2.8rem,12vw,6rem);overflow-wrap:anywhere;margin:20px 0 0}.quiz .pinyin{margin:5px 0 15px}.choice{overflow-wrap:anywhere}.deck-card{cursor:pointer;text-align:left;display:flex;flex-direction:column;gap:4px}.deck-card b{font-size:2rem;overflow-wrap:anywhere}.deck-card:hover{border-color:var(--accent)}.deck-card small{display:block}.notice{background:var(--warm);padding:12px;border-radius:10px}footer{margin-top:30px;color:var(--muted);font-size:.875rem}.empty{grid-column:1/-1;color:var(--muted);padding:15px}#audio-context:empty{display:none}
@media(max-width:1000px){main{padding:25px 22px}.shell{grid-template-columns:185px 1fr}.workspace{grid-template-columns:1fr}.panel{grid-template-columns:1fr 1fr}.voice-panel{grid-column:1/-1}}
@media(max-width:820px){.shell{display:block}main{padding:22px 16px 36px}.panel{grid-template-columns:1fr}.tiles{grid-template-columns:repeat(4,minmax(0,1fr))}.levels button{padding:10px 12px}.levels{gap:8px}.learn-card{padding:18px}.top h1{font-size:1.8rem}}
@media(max-width:420px){.levels{display:grid;grid-template-columns:1fr 1fr}.levels button:last-child{grid-column:1/-1}.levels button:last-child span{display:inline;margin-left:8px}.writing-controls{gap:6px}.writing-controls button{padding:10px;font-size:.9rem}.tiles{grid-template-columns:repeat(3,minmax(0,1fr))}#writer{width:min(260px,100%);aspect-ratio:1;height:auto;min-height:220px}.deck-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.deck-card{padding:12px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
/* Learning workspace v3 */
.text-button{background:none;border:0;text-decoration:underline;cursor:pointer;padding:9px;color:var(--blue);font-size:.9rem}.sync-line{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:-6px 0 20px;font-size:.9rem}.sync-line [data-state=error]{color:var(--danger)}.extra-view{display:grid;gap:20px}.today-banner{padding:28px;border-radius:24px;background:var(--accent-soft);display:flex;align-items:center;justify-content:space-between;gap:24px}.today-banner h2{font-size:clamp(1.4rem,3vw,2rem);letter-spacing:-.025em;max-width:440px}.today-banner p{margin-bottom:0}.today-banner .primary{flex-shrink:0;background:var(--accent)}.session-options{display:flex;gap:20px;align-items:center;justify-content:space-between}.session-options label{flex-shrink:0;display:grid;gap:6px;font-size:.9rem}.session-options p{font-size:.9rem;max-width:370px;color:var(--muted)}.metric-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.metric{padding:18px;background:var(--card);border:1px solid var(--line);border-radius:18px}.metric strong{display:block;font-size:2rem}.metric span{color:var(--muted);font-size:.9rem}.skill-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.skill-grid article{padding:18px 14px;font-size:.875rem;border-radius:16px}.skill-grid article h3{font-size:1rem}.skill-grid article strong{font-size:1.6rem}.skill-grid article p{margin-bottom:0;color:var(--muted)}.button-row{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin:16px 0}.memory-stage{aspect-ratio:1;max-width:260px;margin:8px auto;position:relative;background:var(--soft);border-radius:18px;overflow:hidden}.memory-art,.memory-glyph{position:absolute;inset:0;transition:opacity .4s}.memory-art{background-image:url('images/mnemonic-atlas.png');background-size:400% 400%;background-repeat:no-repeat}.memory-glyph{display:grid;place-items:center;font:700 150px/1 'Noto Sans SC','Microsoft YaHei',sans-serif;color:var(--ink);pointer-events:none}.segmented{display:flex;justify-content:center;gap:4px;background:var(--soft);border-radius:12px;padding:4px}.segmented button{background:none;border:0;padding:8px;border-radius:9px;cursor:pointer;flex:1;font-size:.875rem}.segmented button[aria-pressed=true]{background:var(--ink);color:#fff}.fade-label{display:grid;gap:6px;font-size:.875rem;margin-top:14px}.fade-label input{width:100%;accent-color:var(--accent)}.mnemonic-panel small{font-size:.875rem;color:var(--muted)}details{border-top:1px solid var(--line);padding-top:14px;margin-top:16px}summary{cursor:pointer;font-size:.9rem}textarea{width:100%;resize:vertical;border:1px solid var(--control);border-radius:10px;padding:10px;font:inherit;margin-bottom:8px}.component-chip{border:1px solid currentColor;border-radius:10px;padding:6px 15px;font-size:1.8rem;cursor:pointer}.part-0{background:var(--accent-soft);color:var(--accent)}.part-1{background:var(--blue-soft);color:var(--blue)}.part-2{background:var(--violet-soft);color:var(--violet)}.component-matches{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}.component-matches b{display:block;font-size:1.2rem}.component-matches small{font-size:.875rem;color:var(--muted)}#component-detail{font-size:.9rem}dialog{width:min(620px,calc(100vw - 24px));max-height:calc(100dvh - 30px);overflow:auto;border:1px solid var(--line);border-radius:24px;padding:26px;background:var(--card);color:var(--ink);box-shadow:var(--shadow)}dialog::backdrop{background:rgba(25,40,64,.68)}.session-header{display:flex;align-items:center;justify-content:space-between}.session-header .tag{font-size:.875rem}#session-count{font-size:.9rem;color:var(--muted)}#study-title{font-size:1.4rem}#study-instruction{color:var(--muted)}.study-prompt{font-size:clamp(2rem,9vw,4rem);text-align:center;overflow-wrap:anywhere;margin:24px 0}.answer-word{font-size:2.5rem}#study-answer{border-top:1px solid var(--line);text-align:center;margin-top:20px;padding-top:16px}#study-answer p{margin:5px 0 12px}.rating-row{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.rating-row button{border:1px solid var(--control);border-radius:12px;padding:12px 6px;background:white;cursor:pointer;font-weight:700}.rating-row button:first-child{background:var(--danger-soft)}.rating-row button:nth-child(3){background:var(--success-soft)}.rating-row small{display:block;font-size:.875rem;font-weight:400;margin-top:5px}#study-canvas{display:block;width:100%;height:190px;border:1px solid var(--control);border-radius:12px;background:#fff;touch-action:none}#study-message,#story-save-status{font-size:.875rem;color:var(--muted)}#study-hint-text{background:var(--warm);padding:14px;border-radius:12px}#saved .queue{max-width:760px}#saved .button-row{justify-content:flex-start}#study-dialog button:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
@media(max-width:1100px){.skill-grid{grid-template-columns:1fr 1fr}.session-options{align-items:start;flex-direction:column;gap:0}}
@media(max-width:820px){.today-banner{padding:22px;align-items:stretch;flex-direction:column;gap:8px}.today-banner h2{margin:15px 0}.today-banner .primary{margin-top:12px}.metric{padding:14px}.metric strong{font-size:1.65rem}.memory-stage{max-width:250px}.sync-line{font-size:.875rem}.top{margin-bottom:18px}}
@media(max-width:420px){dialog{padding:18px}.rating-row{grid-template-columns:1fr 1fr}.metric span{font-size:.875rem}.metric-grid{gap:6px}.metric{padding:12px}.skill-grid{gap:8px}}
@media(prefers-reduced-motion:reduce){.memory-art,.memory-glyph{transition:none}}
/* Grammar, sentence context and active practice */
.grammar-today{display:flex;align-items:center;justify-content:space-between;gap:20px}.grammar-today h3{margin:12px 0 6px}.grammar-today p{margin:0;max-width:540px}.grammar-today .button-row{flex-shrink:0}.grammar-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.grammar-topic{position:relative}.grammar-topic h3{padding-right:32px;font-size:1.15rem}.topic-number{position:absolute;top:24px;right:24px;color:var(--muted);font-size:.9rem}.pattern{background:var(--blue-soft);border-radius:10px;padding:12px;line-height:1.7}.grammar-topic .button-row{justify-content:flex-start}.focus-topic[aria-pressed=true]{background:var(--accent-soft);border-color:var(--accent-line)}.grammar-example{border-left:3px solid var(--line);padding:0 0 0 16px;margin:20px 0}.grammar-example p{margin:6px 0}.grammar-example p[lang]{font-size:1.35rem}.grammar-example .pinyin{font-size:.95rem}.sentence-card{border-top:1px solid var(--line);margin-top:24px;padding-top:24px;text-align:left}.context-hanzi{font-size:clamp(1.4rem,4vw,1.9rem);line-height:1.7;overflow-wrap:anywhere}.sentence-card details{border:0;padding:0}.sentence-card .button-row{justify-content:flex-start}.practice-launchers{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;border-bottom:1px solid var(--line);padding-bottom:22px;margin-bottom:22px}.exercise-choices{display:grid;gap:10px;margin-top:22px}.exercise-choice{padding:14px;text-align:left;font-size:1.05rem}.exercise-choice[aria-pressed=true]{background:var(--accent-soft);border:2px solid var(--blue)}.token-bank,.token-answer{display:flex;flex-wrap:wrap;gap:8px;padding:14px;border-radius:14px;min-height:70px}.token-answer{border:2px dashed var(--control);background:var(--blue-soft);margin:20px 0 12px}.token-answer span{color:var(--muted);font-size:.9rem}.token{font:inherit;font-size:1.25rem;background:#fff;border:1px solid var(--control);border-radius:9px;padding:10px 14px;cursor:pointer}.token-bank .token:disabled{opacity:.3}.hint-box{background:var(--warm);padding:16px;border-radius:12px}.result-correct,.result-retry{padding:18px;border-radius:14px;margin-top:18px}.result-correct{background:var(--success-soft)}.result-retry{background:var(--warm)}.result-correct h3,.result-retry h3{margin-top:0}.listening-orb{display:grid;place-items:center;border-radius:50%;width:110px;height:110px;margin:28px auto;background:var(--accent-soft);color:var(--blue);font-size:4rem}.tone-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:24px 0}.tone-card{border:1px solid var(--control);border-radius:16px;background:var(--blue-soft);color:var(--blue);padding:12px 8px;cursor:pointer}.tone-card svg{width:100%;max-height:105px}.tone-card b{display:block;font-size:1.7rem}.tone-card span{display:block;min-height:55px;font-size:.85rem;margin-top:8px}.tone-card:hover{background:var(--blue-soft)}#writing-target{width:min(320px,100%);min-height:250px;margin:18px auto;background:linear-gradient(45deg,transparent 49.8%,var(--line) 50%,transparent 50.2%),linear-gradient(-45deg,transparent 49.8%,var(--line) 50%,transparent 50.2%),linear-gradient(90deg,transparent 49.8%,var(--line) 50%,transparent 50.2%),linear-gradient(0deg,transparent 49.8%,var(--line) 50%,transparent 50.2%),#fff;border:1px solid var(--control);border-radius:6px;touch-action:none}#writing-target svg{display:block;max-width:100%;height:auto}#writing-feedback{min-height:45px}#voice-playback{width:100%;margin-top:20px}.example-status,#exercise-audio-status,#voice-feedback{font-size:.9rem;color:var(--muted)}#exercise-result p{overflow-wrap:anywhere}#exercise-dialog button:focus-visible,#writing-dialog button:focus-visible,#voice-dialog button:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
@media(max-width:1100px){.grammar-today{align-items:flex-start;flex-direction:column;gap:8px}.grammar-today .button-row{margin-bottom:0}}
@media(max-width:820px){.grammar-grid{grid-template-columns:1fr}.tone-grid{grid-template-columns:repeat(2,1fr)}.tone-card span{min-height:0}.tone-card svg{height:75px}.grammar-today .button-row{justify-content:flex-start}}
@media(max-width:380px){.token{padding:10px}.grammar-topic .button-row{flex-direction:column;align-items:stretch}}
/* Pinyin sound studio */
.pinyin-tabs{display:flex;flex-wrap:wrap;gap:10px}.pinyin-tabs [aria-pressed=true]{background:var(--blue);color:white;border-color:var(--blue)}#pinyin-intro{margin:0;max-width:760px}.pinyin-workspace{display:grid;grid-template-columns:minmax(235px,.75fr) minmax(0,1.6fr);align-items:start;gap:22px}.pinyin-picker{max-height:820px;overflow:auto}.pinyin-sound-group+.pinyin-sound-group{margin-top:24px}.pinyin-sound-group h3{font-size:.9rem;color:var(--muted);font-weight:500;margin:0 0 10px}.pinyin-sound-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}.pinyin-sound-grid button{min-height:48px;border:1px solid var(--control);border-radius:12px;background:var(--soft);color:var(--ink);font-size:1.25rem;cursor:pointer}.pinyin-sound-grid [aria-pressed=true],.pinyin-word[aria-pressed=true]{background:var(--accent-soft);border:2px solid var(--blue)}.pinyin-detail{padding:28px;min-width:0}.pinyin-large{font-size:clamp(3.5rem,7vw,5.5rem);line-height:1.2;margin:22px 0;color:var(--ink);letter-spacing:-.02em}.pinyin-cue{font-size:1.1rem;line-height:1.65;max-width:560px}.pinyin-note{font-size:.88rem;line-height:1.6;color:var(--muted);background:var(--blue-soft);padding:12px 14px;border-radius:10px}.pinyin-tone-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin:20px 0}.pinyin-tone{cursor:pointer;border:1px solid var(--control);background:var(--soft);border-radius:14px;min-width:0;padding:14px 7px;color:var(--blue);display:flex;flex-direction:column;align-items:center;gap:5px}.pinyin-tone[aria-pressed=true]{border:2px solid var(--blue);background:var(--accent-soft);padding:13px 6px;box-shadow:0 3px 0 var(--line)}.pinyin-tone strong{font-size:clamp(1.65rem,2.8vw,2.35rem);font-weight:500}.pinyin-tone span{font-size:.8rem;min-height:2.4em}.pinyin-tone small{font-size:.78rem}.pinyin-contour{display:block;max-width:160px;height:85px;width:100%}.pitch-grid{stroke:var(--line);stroke-width:1;fill:none;stroke-dasharray:3 4}.pitch-line{stroke:var(--accent);stroke-width:4;stroke-linecap:round;fill:none}.pinyin-listen-panel{border-top:1px solid var(--line);margin-top:24px;padding-top:12px}.pinyin-self-rating{border-top:1px solid var(--line);margin-top:18px;padding-top:18px}.pinyin-self-rating h3{margin:0;font-size:1rem}.pinyin-detail .button-row{justify-content:flex-start}.pinyin-word-reading{font-size:1.6rem;color:var(--accent);margin:0}.pinyin-breakdown{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:24px 0}.pinyin-breakdown>div{display:flex;align-items:center;flex-direction:column;gap:8px;border:1px solid var(--line);border-radius:12px;padding:16px 8px;text-align:center}.pinyin-breakdown strong{font-size:1.8rem;font-weight:500}.pinyin-breakdown span{font-size:.8rem;color:var(--muted)}.pinyin-word-filters{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:14px}.pinyin-word-filters label,#pinyin-filters>label{font-size:.85rem}.pinyin-word-filters select{display:block;width:100%;margin-top:5px;min-height:40px}#pinyin-word-search{width:100%;margin-top:7px}.pinyin-word-list{display:grid;gap:8px}.pinyin-word{width:100%;display:flex;align-items:center;gap:12px;border:1px solid var(--control);background:var(--soft);border-radius:12px;padding:12px;cursor:pointer;text-align:left;color:var(--ink);min-width:0}.pinyin-word>strong{font-size:1.9rem;font-weight:500}.pinyin-word>span{flex:1;min-width:0}.pinyin-word small{display:block;font-size:.75rem;font-weight:400;color:var(--muted);line-height:1.4}.pinyin-word>small{white-space:nowrap}.pinyin-word>span>small{overflow-wrap:anywhere}.neutral-tone{display:block;color:var(--muted);padding:14px 0}#pinyin-lab button:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
@media(max-width:1100px){.pinyin-workspace{grid-template-columns:minmax(200px,.75fr) minmax(0,1.4fr)}.pinyin-detail{padding:20px}.pinyin-tone-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:820px){.pinyin-workspace{grid-template-columns:1fr}.pinyin-picker{max-height:280px;padding:18px}.pinyin-sound-grid{grid-template-columns:repeat(6,minmax(0,1fr))}.pinyin-tone-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.pinyin-large{font-size:4rem}.pinyin-tabs{gap:7px}.pinyin-tabs button{flex:1;font-size:.85rem;padding:12px 8px}.pinyin-breakdown{gap:6px}}
@media(max-width:450px){.pinyin-tone-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.pinyin-sound-grid{grid-template-columns:repeat(5,minmax(0,1fr))}.pinyin-detail{padding:20px}.pinyin-breakdown span{font-size:.75rem}.pinyin-tabs button:last-child{flex-basis:100%}}

body[data-extra-view="pinyin-lab"] .toolbar,body[data-extra-view="pinyin-lab"] .top>.progress{display:none}#pinyin-lab[data-practice="words"] .pinyin-picker{max-height:none}.pinyin-word-list{max-height:440px;overflow:auto}
@media(max-width:820px){.pinyin-word-list{max-height:220px}}

/* Hanzi Spark identity: ink blue, orange seal and ivory paper. */
.nav button.active{background:var(--nav-soft);color:var(--nav-accent);box-shadow:inset 3px 0 var(--brand)}
.side button:focus-visible{outline-color:var(--nav-accent)}
.today-banner{background:var(--ink);color:white;border:1px solid var(--nav-soft);box-shadow:inset 0 4px var(--brand)}
.today-banner p{color:var(--nav-text)}
.today-banner .tag{background:var(--nav-soft);color:var(--nav-accent)}
.today-banner .primary{background:var(--brand);color:var(--ink)}
.today-banner .primary:hover:not(:disabled){background:var(--nav-accent)}
.today-banner button:focus-visible{outline-color:var(--nav-accent)}
.tag{color:var(--blue)}
.metric strong{color:var(--accent)}
.skill-grid article{border-top:3px solid var(--blue)}
.skill-grid article:nth-child(2){border-top-color:var(--accent)}
.skill-grid article:nth-child(3){border-top-color:var(--violet)}
.skill-grid article:nth-child(4){border-top-color:var(--muted)}
.pinyin-tabs [aria-pressed=true]{background:var(--accent);border-color:var(--accent)}
.pinyin-sound-grid [aria-pressed=true],.pinyin-word[aria-pressed=true],.pinyin-tone[aria-pressed=true],.focus-topic[aria-pressed=true],.exercise-choice[aria-pressed=true]{border-color:var(--accent)}
.pinyin-tone[aria-pressed=true]{box-shadow:0 3px 0 var(--accent-line)}
.choice.good,.result-correct{color:var(--success)}
.choice.bad,.result-retry{color:var(--danger)}
.tone-card svg path:first-child{stroke:var(--control)}
.tone-card svg path:last-child{stroke:var(--accent)}
input[type=checkbox],input[type=range]{accent-color:var(--accent)}


/* Account identity stays visible above the learning navigation. */
.account-strip{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 18px;margin:0 0 16px;border:1px solid var(--line);border-radius:16px;background:var(--card)}
.account-strip>div{display:flex;align-items:center;gap:12px;min-width:0}.account-strip>div>span:last-child{min-width:0}.account-strip small{display:block;font-size:.7rem;letter-spacing:.1em;color:var(--muted);margin-bottom:3px}.account-strip strong{display:block;font-size:.95rem;overflow-wrap:anywhere}.account-icon{display:grid;place-items:center;width:38px;height:38px;flex-shrink:0;border-radius:12px;background:var(--accent-soft);color:var(--accent);font-size:1.4rem}.account-strip button{flex-shrink:0}#account-dialog a{text-decoration:none;text-align:center;display:inline-block}#legacy-import-panel{border:1px solid var(--accent-line);background:var(--warm);padding:16px;border-radius:12px}@media(max-width:520px){.account-strip{align-items:flex-start;flex-direction:column}.account-strip button{padding-left:0}}

.communication-tabs{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:24px}.communication-catalog{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}.communication-catalog article{display:grid;gap:12px}.communication-hanzi{font-size:clamp(22px,3vw,28px);line-height:1.9;white-space:pre-line}.communication-section h2{margin:18px 0;font-size:28px}.communication-section .queue{margin:20px 0}.communication-section details{margin:18px 0}.communication-section summary{cursor:pointer;font-weight:600}.communication-choices{display:flex;flex-wrap:wrap;gap:12px;margin:18px 0}.communication-choices button{font-size:19px}.communication-correct{color:#286646}.communication-wrong{color:#ad4234}.communication-check{display:block;margin:12px 0}.communication-section textarea{width:100%;padding:14px;border:1px solid #d9dfe8;border-radius:10px;resize:vertical;margin:10px 0;font-size:18px}.communication-section audio{width:100%;margin:16px 0}.communication-section label{line-height:1.7}.communication-section h3{margin:14px 0}@media(max-width:600px){.communication-tabs button{flex:1;min-width:130px}.communication-catalog{grid-template-columns:1fr}.communication-choices button{flex:1;min-width:100px}}