:root{--ocean:#07717d;--deep:#076a75;--ink:#203d48;--muted:#526b72;--bg:#f6faf7;--line:#e1eae4;--yellow:#ffc95b;--mint:#e6f4eb;--purple:#eeeafa;--pink:#fff0e9;--radius:22px;font-family:'Yuanti SC','PingFang SC','Microsoft YaHei',system-ui,sans-serif;color:var(--ink);background:var(--bg);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit;border:0}button:disabled{cursor:default}a{color:var(--ocean)}a:hover{text-decoration:none}button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #d18a00;outline-offset:4px}button,a{touch-action:manipulation}button:hover{filter:brightness(.975)}button:active{transform:translateY(1px)}.skip{position:fixed;left:260px;top:-100px;z-index:100;padding:12px;background:white}.skip:focus{top:8px}.pinyin{font-family:'Trebuchet MS','Century Gothic','Arial',sans-serif;letter-spacing:.025em}.sidebar{width:236px;position:fixed;inset:0 auto 0 0;background:#fff;border-right:1px solid var(--line);padding:34px 24px;display:flex;flex-direction:column;z-index:5}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);font-size:24px;font-weight:800;white-space:nowrap}.brand small{display:block;font-size:10px;letter-spacing:.02em;color:var(--muted);font-weight:500;margin-top:5px}.brand-icon{display:flex;align-items:center;justify-content:center;flex-direction:column;background:var(--ocean);color:white;width:44px;height:48px;border-radius:15px;font:700 32px/1 'Trebuchet MS';padding-top:3px}.brand-icon span{font-size:22px;height:12px;line-height:10px;margin-top:-2px}.nav-label{font-size:11px;color:var(--muted);margin:47px 14px 18px;letter-spacing:.12em}.nav-item{display:flex;gap:13px;align-items:center;padding:15px 14px;text-decoration:none;color:#526971;border-radius:13px;margin-bottom:8px;font-size:14px;font-weight:600;min-height:50px}.nav-item:hover{background:#f6faf7}.nav-item.active{background:#e4f2ec;color:var(--deep)}.nav-icon{font-family:'Trebuchet MS',sans-serif;font-size:22px;width:23px;text-align:center}.nav-dot{width:6px;height:6px;border-radius:50%;background:var(--ocean);margin-left:auto}.sidebar-bottom{margin-top:auto;background:#f6faf7;padding:18px 13px;border-radius:18px;text-align:center}.sidebar-bottom strong{font-size:13px}.sidebar-bottom p{font-size:10px;color:var(--muted);margin-bottom:0}.little-boat{font-size:31px;margin-bottom:10px}.workspace{margin-left:236px}.topbar{height:88px;padding:0 42px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}.breadcrumb{font-size:12px;color:var(--muted)}.breadcrumb span{margin:0 14px;color:#acbbb8}.top-actions{display:flex;align-items:center;gap:22px}.sound-help{background:none;font-size:15px;color:var(--muted);min-height:44px}.sound-help span{font-size:12px;margin-left:4px}.avatar{background:#f4e8d0;width:39px;height:39px;border-radius:50%;display:grid;place-items:center;text-decoration:none;font-size:23px}main{max-width:1370px;margin:auto;padding:33px 42px 26px;min-height:calc(100vh - 160px)}h1,h2,h3,p{margin-top:0}h1{font-size:30px;letter-spacing:-.03em;margin:8px 0 10px;font-weight:800}h2{font-size:18px;line-height:1.5;margin-bottom:12px;font-weight:750}h3{font-size:16px;margin-bottom:10px}p{color:var(--muted);font-size:14px;line-height:1.85}small{font-size:12px}.eyebrow{font-size:10px;letter-spacing:.15em;color:var(--ocean);font-weight:750}.page-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:25px;gap:18px}.page-heading p{margin-bottom:0;font-size:13px}.date-pill{background:#fff;border:1px solid var(--line);padding:10px 15px;border-radius:30px;font-size:12px;white-space:nowrap}.hero{background:#e0f0e7;border:1px solid #d4e8dc;display:flex;align-items:center;border-radius:26px;position:relative;overflow:hidden;min-height:354px;margin-bottom:25px}.hero-copy{padding:32px 35px;width:48%;position:relative;z-index:1}.pill{display:inline-block;font-size:11px;border:1px solid #cce1d6;background:#f6faf7bb;padding:7px 12px;border-radius:30px;color:#467167}.hero h2{font-size:43px;line-height:1.25;letter-spacing:-.03em;margin:18px 0 14px;font-weight:800}.hero h2>span{color:var(--ocean)}.hero p{font-size:12px;line-height:1.9;margin-bottom:20px}.primary{background:var(--ocean);color:white;border-radius:12px;min-height:47px;padding:12px 22px;font-size:14px;font-weight:650;box-shadow:0 5px 0 #05657212;display:inline-flex;align-items:center;justify-content:center;gap:18px}.primary:hover{background:var(--deep)}.hero-foot{font-size:10px;color:#57746c;display:flex;align-items:center;gap:9px;margin-top:21px}.mini-faces{font-size:17px;letter-spacing:-4px;padding-right:5px}.island-art{width:58%;position:absolute;right:-16px;bottom:10px}.section-top{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:15px}.section-top h2{margin:0}.muted{color:var(--muted);font-size:11px}.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px}.home-row{display:grid;grid-template-columns:1.8fr 1fr;gap:22px;margin-bottom:31px}.today-content{display:flex;gap:22px;align-items:center;margin-top:23px}.unit-art{display:grid;place-items:center;width:82px;height:82px;flex-shrink:0;background:#fff2d4;color:#8c6b26;border-radius:21px;font:600 40px 'Trebuchet MS';box-shadow:inset 0 0 0 7px #fff8e9}.today-content h3{font-size:16px;margin-bottom:6px}.today-content p{font-size:11px;margin-bottom:4px}.text-button{background:transparent;color:var(--deep);font-weight:650;padding:8px 0;min-height:44px;font-size:12px}.progress-line{display:flex;justify-content:space-between;align-items:baseline;margin:13px 0 12px}.progress-line strong{font:700 31px 'Trebuchet MS'}.progress-line small{font-weight:500;color:var(--muted);font-size:15px}.progress-line>span{font-size:11px;color:var(--muted)}.progress-track{height:7px;background:#edf3ef;border-radius:8px;overflow:hidden}.progress-track i{display:block;height:100%;background:var(--ocean);border-radius:8px;transition:width .2s}.progress-card p{font-size:11px;margin:13px 0 0}.explore-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:32px}.explore-card{position:relative;text-decoration:none;color:var(--ink);border-radius:19px;padding:21px 18px;border:1px solid #00000005;transition:transform .2s}.explore-card:hover{transform:translateY(-3px)}.mint{background:var(--mint)}.yellow{background:#fff3d9}.purple{background:var(--purple)}.pink{background:var(--pink)}.explore-icon{height:47px;display:inline-flex;align-items:center;font:700 30px 'Trebuchet MS';color:var(--deep);margin-bottom:14px}.yellow .explore-icon{font-size:25px;color:#8d6824}.purple .explore-icon{color:#68609c}.pink .explore-icon{color:#ac5f46}.explore-card h3{font-size:14px;margin-bottom:7px}.explore-card p{font-size:10px;margin:0}.round-arrow{position:absolute;right:14px;top:21px;background:#ffffff99;width:27px;height:27px;display:grid;place-items:center;border-radius:50%;font-size:15px}.unit-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.unit-card{background:#fff;border:1px solid var(--line);border-radius:15px;display:flex;align-items:center;text-align:left;padding:17px;gap:16px;min-height:84px}.unit-card.current{border-color:#8db7a9}.unit-num{background:#f1f6f2;border-radius:11px;width:38px;height:38px;display:grid;place-items:center;color:var(--ocean);font:600 16px 'Trebuchet MS';flex-shrink:0}.unit-card strong{font-size:13px;display:block}.unit-card small{color:var(--muted);display:block;margin-top:6px;font-size:10px}.arrow{margin-left:auto;color:var(--muted)}footer{padding:25px 42px 32px;color:#526b66;text-align:center;font-size:10px}footer span{margin:0 8px}.mobile-nav{display:none}.tabs{display:flex;gap:8px;margin-bottom:19px}.tabs button{padding:12px 20px;border-radius:12px;background:#fff;border:1px solid var(--line);min-height:47px;font-size:14px}.tabs button.active{background:var(--ocean);color:white;border-color:var(--ocean)}.tabs small{margin-left:9px;opacity:.8;font-family:'Trebuchet 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12px;color:var(--deep)}.sound-detail>.primary{width:100%;margin-bottom:8px}.audio-caption{font-size:10px!important;line-height:1.8!important;display:block;color:var(--muted);margin:10px 0 18px}.mouth-hint{background:#f5f8f3;padding:14px;border-radius:13px;display:flex;gap:10px;text-align:left;align-items:center}.mouth-hint>span{font-size:23px}.mouth-hint p{font-size:11px;margin:0}.example{padding:17px 0;margin:15px 0;width:100%;background:white;display:flex;align-items:center;gap:15px;border-bottom:1px solid var(--line);text-align:left}.example-emoji{font-size:32px}.example small{display:block;color:var(--muted);font-size:10px;margin-bottom:5px}.example strong{font-size:13px}.example>span:last-child{margin-left:auto;color:var(--ocean)}.secondary{background:white;color:var(--deep);border:1px solid #cbded7;border-radius:11px;padding:11px 18px;min-height:44px;font-size:12px;font-weight:600;display:inline-flex;align-items:center;justify-content:center;gap:8px}.tone-controls{display:flex;gap:12px;margin:22px 0}.tone-controls button{border:1px solid var(--line);border-radius:12px;min-height:65px;background:white;flex:1;font-size:12px;display:flex;justify-content:center;align-items:center;gap:13px}.tone-controls button .pinyin{font-size:32px;color:var(--ocean)}.tone-controls button.active{border-color:#88b8a9;background:#e8f4ec}.support-panel{margin-top:25px}.support-panel p{font-size:12px;margin-bottom:0}.blend-result{text-align:center;background:#f0f7f2;padding:28px}.compact{justify-content:center;margin:0}.compact button{font-size:12px}.equation{display:flex;align-items:center;justify-content:center;gap:17px;margin:38px 0 23px}.part{font-size:51px;width:100px;min-height:95px;display:grid;place-items:center;background:white;border-radius:18px;border:1px solid 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svg{width:100%;height:45px}.tone-mountain strong{display:block;font-size:27px;margin:7px 0}.tone-mountain span{font-size:11px;color:var(--muted)}.story-tabs{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:24px}.story-tabs button{background:#fff;border:1px solid var(--line);border-radius:11px;padding:12px 17px;min-height:46px;font-size:13px}.story-tabs button.active{background:var(--ocean);color:white}.story{text-align:center;background:#fffdf7;padding:28px 30px}.story-heading{display:flex;align-items:center;justify-content:space-between}.story-scene{font-size:64px;margin:22px 0}.story h2{font-size:24px;margin-bottom:25px}.story-line{display:flex;gap:12px;justify-content:center;align-items:end;margin-bottom:25px}.word{background:transparent;display:flex;flex-direction:column;align-items:center;border-radius:10px;padding:9px 8px;min-width:50px}.word:hover{background:#fff3d9}.word .pinyin{font-size:17px;color:var(--ocean);margin-bottom:13px;white-space:nowrap}.word strong{font-size:31px;font-weight:600}.punct{font-size:30px;margin:0 0 10px -10px}.read-question{margin-top:22px;border-top:1px solid #e9e5da;padding-top:20px;font-size:13px;text-align:left}.read-question summary{cursor:pointer;line-height:1.7}.read-question p{font-size:13px;margin:13px 0 0}.story{margin-bottom:30px}.word-bank{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}.word-card{display:flex;flex-direction:column;align-items:center;padding:20px;gap:12px}.word-card>span{font-size:35px}.word-card strong{font-size:24px;color:var(--ocean)}.word-card small{color:var(--muted);font-size:12px}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-bottom:25px}.stat{text-align:center;padding:25px 10px}.stat strong{display:block;font:700 33px 'Trebuchet MS';color:var(--ocean);margin-bottom:9px}.stat span{font-size:12px;color:var(--muted)}.parent-section{margin-bottom:20px}.parent-section>p{font-size:12px}.parent-section label{display:block;font-size:12px;margin:15px 0 10px}.parent-section select{width:100%;max-width:450px;border:1px solid #cbded7;background:#f7faf7;border-radius:10px;padding:13px;color:var(--ink);font-size:13px}.empty-state{text-align:center;padding:20px;font-size:36px}.empty-state strong{display:block;font-size:15px;margin:10px 0}.empty-state p{font-size:12px;margin-bottom:0}.review-list{display:grid;grid-template-columns:1fr 1fr;gap:12px}.review-list button{display:flex;align-items:center;gap:15px;border:1px solid var(--line);padding:15px;border-radius:12px;background:#f7faf7}.review-list strong{font-size:24px}.review-list span{font-size:10px;color:var(--muted)}.review-list>button>span:last-child{margin-left:auto;color:var(--ocean)}.parent-tips{padding-left:22px;font-size:12px;line-height:2.5;color:var(--muted)}.parent-section .button-row{justify-content:flex-start}.danger{color:#b3533d}.file-label{margin:0!important;position:relative;cursor:pointer;overflow:hidden}.file-label input{position:absolute;inset:0;opacity:0;cursor:pointer;width:100%}.parent-section summary{font-size:14px;font-weight:600;cursor:pointer}.parent-section a{overflow-wrap:anywhere}#toast{position:fixed;bottom:30px;left:calc(50% + 100px);transform:translateX(-50%) translateY(20px);max-width:calc(100vw - 30px);padding:14px 22px;background:var(--ink);color:white;border-radius:14px;z-index:50;opacity:0;pointer-events:none;transition:.2s;font-size:13px;line-height:1.65;box-shadow:0 8px 35px #15362920}#toast.show{opacity:1;transform:translateX(-50%) translateY(0)}dialog{width:min(560px,calc(100vw - 32px));max-height:90dvh;border:1px solid var(--line);border-radius:26px;padding:38px;color:var(--ink);box-shadow:0 25px 100px #163c3f22}dialog::backdrop{background:#173e4555;backdrop-filter:blur(4px)}dialog h2{font-size:23px;margin:16px 0}dialog p{font-size:13px}.close-dialog{position:absolute;right:14px;top:12px;background:#f0f5f1;border-radius:50%;width:36px;height:36px;font-size:25px;color:#667e77}.lesson-chips{display:flex;flex-wrap:wrap;gap:12px;margin:25px 0}.lesson-chips .sound-chip{min-width:70px;padding:12px;flex:1}.lesson-chips small{display:block;margin-top:8px;font-size:10px;color:var(--muted)}.lesson-word{display:flex;align-items:center;justify-content:space-between;padding:18px 0;margin:14px 0;font-size:13px}.lesson-word .pinyin{font-size:25px}.full{width:100%}.quiz-top{display:flex;align-items:center;justify-content:space-between;margin:8px 0 18px;font-size:12px;color:var(--muted);padding-right:8px}.quiz-top+.progress-track{margin-bottom:24px}.question-listen{margin:22px auto;display:flex;flex-direction:column;align-items:center;justify-content:center;background:#e4f2ec;color:var(--ocean);width:145px;height:125px;font-size:49px;border-radius:24px;gap:8px}.question-listen span{font-size:12px}.question-pic{text-align:center;font-size:78px;line-height:1.4;margin:22px 0}.answer-grid{display:grid;grid-template-columns:1fr 1fr;gap:13px}.answer{background:#f7faf7;border:2px solid var(--line);padding:19px;font-size:29px;min-height:77px;border-radius:15px}.answer.correct{border-color:#5a9d77;background:#e4f3ea;color:#327250}.answer.wrong{border-color:#dc8a70;background:#fff0e9}.feedback{font-size:12px;text-align:center;padding:18px 0;color:#a66a38;min-height:55px}.feedback.success{color:#327250}.finish-icon{font-size:82px;text-align:center;margin:15px}.center{text-align:center;justify-content:center}#record-result{font-size:12px;margin-top:14px}#record-result p{font-size:11px}#record-result audio{max-width:100%;height:40px;width:100%}
@media(min-width:1500px){.hero h2{font-size:51px}.hero{min-height:380px}.hero-copy{padding:40px}.island-art{right:15px;width:55%;bottom:0}.explore-card{padding:25px}.explore-card h3{font-size:16px}.explore-card p{font-size:12px}}
@media(max-width:1150px){.sidebar{width:205px;padding:28px 16px}.workspace{margin-left:205px}.brand{font-size:21px;gap:9px}.brand-icon{width:40px}.topbar{padding:0 28px}main{padding:28px}.hero h2{font-size:36px}.hero-copy{padding:28px}.hero{min-height:328px}.island-art{width:60%;right:-30px}.explore-grid{gap:12px}.explore-card{padding:18px 13px}.explore-card p{font-size:10px}.today-content{gap:16px}.home-row{grid-template-columns:1.6fr 1fr;gap:16px}.panel{padding:20px}.sound-grid{grid-template-columns:repeat(5,1fr)}.tone-school{flex-direction:column;align-items:stretch}.tone-mountain{width:100%}.practice-grid{gap:14px}.part{width:85px}.equation{gap:11px}.word-bank{grid-template-columns:repeat(4,1fr)}}
@media(max-width:900px) and (min-width:701px){.sidebar{width:175px;padding:24px 12px}.workspace{margin-left:175px}.brand{font-size:18px;gap:7px}.brand small{font-size:8px}.brand-icon{width:34px;height:40px;font-size:27px;border-radius:12px}.nav-item{font-size:12px;gap:9px;padding:14px 9px}.hero h2{font-size:31px}.hero-copy{padding:24px;width:52%}.island-art{width:63%;right:-65px;bottom:15px}.hero-foot{font-size:9px}.hero p{font-size:11px}.home-row{grid-template-columns:1fr}.explore-grid{grid-template-columns:repeat(2,1fr)}.chart-layout{grid-template-columns:1fr}.sound-detail{position:static}.big-sound{font-size:85px}.practice-grid{grid-template-columns:repeat(2,1fr)}.sound-grid{grid-template-columns:repeat(6,1fr)}.word-bank{grid-template-columns:repeat(3,1fr)}.equation{gap:8px}.part{width:64px;font-size:36px;min-height:74px}.result{font-size:49px;min-width:100px}}
@media(max-width:700px){.sidebar{position:static;width:auto;border-right:0;padding:17px 20px 15px;border-bottom:1px solid var(--line);background:white}.sidebar .nav-label,.sidebar nav,.sidebar-bottom{display:none}.brand{font-size:21px;gap:10px}.brand-icon{width:38px;height:41px;font-size:28px;border-radius:13px}.brand small{font-size:9px}.workspace{margin-left:0}.topbar{height:57px;padding:0 20px}.breadcrumb{font-size:10px}.breadcrumb span{margin:0 8px}.top-actions{gap:12px}.sound-help span{display:none}.sound-help{font-size:21px}.avatar{width:31px;height:31px;font-size:19px}main{padding:25px 18px 20px}.page-heading{margin-bottom:21px;align-items:flex-start;gap:9px}.eyebrow{font-size:8px;letter-spacing:.1em}h1{font-size:26px;margin:9px 0}.page-heading p{font-size:11px}.date-pill{font-size:9px;padding:8px 10px;margin-top:20px}.hero{min-height:440px;align-items:flex-start;border-radius:23px;margin-bottom:19px}.hero-copy{padding:24px;width:100%}.hero h2{font-size:37px;margin:14px 0 10px;line-height:1.15}.hero p{font-size:11px;margin-bottom:14px}.hero .primary{font-size:12px;min-height:43px;padding:11px 18px}.pill{font-size:9px;padding:6px 10px}.hero-foot{margin-top:14px;font-size:9px}.island-art{width:320px;max-width:85%;right:-15px;bottom:-10px;opacity:.95}.hero-copy{z-index:2}.hero-foot{position:absolute;bottom:-174px;left:24px;background:#e0f0e7c9;padding:6px;border-radius:12px}.home-row{grid-template-columns:1fr;gap:14px;margin-bottom:26px}.panel{padding:20px;border-radius:19px}.today-card .section-top{margin-bottom:15px}.today-content{margin-top:15px;gap:16px}.unit-art{width:65px;height:65px;font-size:34px;border-radius:16px}.today-content h3{font-size:14px}.today-content p{font-size:10px}.progress-card{display:grid;grid-template-columns:1fr 1fr;gap:0 15px}.progress-card h2{font-size:14px;margin-bottom:4px}.progress-line{grid-row:1/3;grid-column:2;justify-content:flex-end;gap:12px;margin:0}.progress-line strong{font-size:30px}.progress-card p{margin:9px 0 0;font-size:10px;grid-column:1/3}.progress-card .progress-track{margin-top:10px}.section-top h2{font-size:16px}.muted{font-size:9px}.explore-grid{grid-template-columns:repeat(2,1fr);gap:12px;margin-bottom:27px}.explore-card{padding:18px 16px}.explore-icon{font-size:29px;height:38px;margin-bottom:13px}.explore-card h3{font-size:13px}.explore-card p{font-size:10px;line-height:1.65}.round-arrow{right:12px;top:17px;width:24px;height:24px}.unit-grid{grid-template-columns:1fr;gap:10px}.unit-card{min-height:77px;padding:15px}.unit-card strong{font-size:13px}.unit-card small{font-size:10px}.unit-num{width:35px;height:35px}.mobile-nav{display:flex;justify-content:space-around;position:fixed;bottom:0;left:0;right:0;background:#fffffff5;border-top:1px solid #e3eae4;padding:8px 7px calc(9px + env(safe-area-inset-bottom));z-index:20;backdrop-filter:blur(12px)}.mobile-nav a{flex:1;text-align:center;text-decoration:none;color:#526b66;border-radius:12px;min-height:46px;padding:4px 1px}.mobile-nav a.active{color:var(--ocean);background:#e8f4ec}.mobile-nav a>span{display:block;font:600 21px 'Trebuchet MS';line-height:25px}.mobile-nav small{font-size:9px;display:block;margin-top:3px}footer{padding:16px 15px 102px;line-height:1.8;font-size:9px}#toast{bottom:91px;left:50%;width:max-content;max-width:calc(100vw - 32px);font-size:12px}.chart-layout{grid-template-columns:1fr;gap:18px}.tabs{gap:7px;margin-bottom:15px}.tabs button{padding:10px 12px;font-size:12px;flex:1;min-height:44px;white-space:nowrap}.tabs small{margin-left:6px;font-size:10px}.library{padding:19px 15px}.sound-grid{grid-template-columns:repeat(5,1fr);gap:8px}.sound-chip{min-height:61px;font-size:23px;border-radius:11px}.group-label{font-size:10px;margin:20px 0 10px}.sound-detail{position:static;padding:23px}.big-sound{font-size:89px;margin:18px 0}.tone-controls{gap:8px;margin:17px 0}.tone-controls button{font-size:10px;gap:7px;min-height:59px}.tone-controls button .pinyin{font-size:26px}.sound-detail .secondary{width:100%}.tip{font-size:10px;padding:12px}.mouth-hint p{font-size:12px}.example strong{font-size:15px}.audio-caption{font-size:10px!important}.blend-result{padding:21px 14px}.compact button{flex:initial;padding:9px 17px}.equation{gap:8px;margin:27px 0 19px;flex-wrap:wrap}.part{font-size:31px;width:57px;min-height:65px;border-radius:12px}.operator{font-size:22px}.result{font-size:50px;min-width:95px}.equation .result{line-height:1.35}.blend-result p{font-size:11px}.button-row{gap:9px}.button-row .primary,.button-row .secondary{font-size:11px;padding:11px 13px;gap:8px}.choice{min-width:47px;min-height:49px;font-size:23px;padding:8px 12px}.choice-grid{gap:8px}.blend-picker h2{font-size:13px}.rule-grid{grid-template-columns:1fr;gap:12px}.rule summary{font-size:13px}.rule-example{font-size:20px}.practice-grid{grid-template-columns:repeat(2,1fr);gap:12px}.practice-card{padding:18px 15px;min-height:203px}.practice-icon{font-size:30px;min-height:42px}.practice-card h2{font-size:14px;margin:13px 0 7px}.practice-card p{font-size:10px}.practice-card .text-button{font-size:10px}.tone-school{display:block}.tone-mountain{margin-top:22px;gap:9px}.tone-mountain button{padding:10px 5px}.tone-mountain svg{height:34px}.tone-mountain strong{font-size:24px}.tone-mountain span{font-size:9px}.story-tabs{gap:8px;margin-bottom:17px}.story-tabs button{flex:1 0 40%;font-size:12px;padding:11px}.story{padding:20px 12px}.story-heading{padding:0 5px}.story-heading .secondary{font-size:10px;padding:9px 11px}.story-scene{font-size:52px;margin:22px 0}.story h2{font-size:22px}.story-line{gap:3px;margin-bottom:17px;flex-wrap:wrap}.word{min-width:42px;padding:8px 4px}.word .pinyin{font-size:13px;margin-bottom:11px}.word strong{font-size:26px}.punct{font-size:25px;margin-left:-4px}.read-question{margin:20px 5px 0;font-size:12px}.word-bank{grid-template-columns:repeat(3,1fr);gap:11px}.word-card{padding:17px 10px;gap:9px}.word-card>span{font-size:29px}.word-card strong{font-size:21px}.word-card small{font-size:10px}.stats-grid{grid-template-columns:repeat(2,1fr);gap:12px}.stat{padding:21px 10px}.stat strong{font-size:29px}.stat span{font-size:11px}.parent-section h2{font-size:16px}.parent-section .section-top{align-items:flex-start}.parent-section .section-top .text-button{font-size:10px;padding-top:0}.review-list{grid-template-columns:1fr;gap:9px}.parent-section p{font-size:12px}.parent-tips{line-height:2.2}.empty-state{padding:13px 0}.parent-section .button-row{gap:10px}.file-label{font-size:11px}dialog{padding:31px 22px;border-radius:22px;max-height:88dvh}dialog h2{font-size:21px}dialog p{font-size:12px}.lesson-chips{gap:9px}.lesson-chips .sound-chip{min-width:60px;font-size:23px}.answer{font-size:28px;padding:15px;min-height:70px}.question-pic{font-size:68px}.close-dialog{width:34px;height:34px}.quiz-top{margin-top:14px}.question-listen{width:132px;height:112px}.finish-icon{font-size:67px}}
@media(max-width:360px){main{padding:22px 13px}.date-pill{display:none}.hero-copy{padding:22px}.hero h2{font-size:34px}.sound-grid{grid-template-columns:repeat(4,1fr)}.tone-controls button{gap:4px}.equation{gap:5px}.part{width:49px;font-size:27px}.result{font-size:43px;min-width:83px}.word .pinyin{font-size:11px}.word{min-width:37px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}

@media(max-width:700px){.hero-foot{display:none}.mobile-nav small{font-size:11px}}
.tabs button.active small{opacity:1}