:root{--ink:#233c36;--green:#235f56;--paper:#faf7f0;--soft:#e7eee7;--gold:#e9bf65;--line:#d6dfd8;--muted:#63736c}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;font-size:21px;line-height:1.5}button,input,select{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer;border:0;border-radius:18px;padding:14px 20px;font-weight:650;min-height:56px;color:var(--ink);background:var(--soft)}button:disabled{opacity:.45;cursor:default}button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--gold);outline-offset:3px}.primary{background:var(--green);color:white}.outline{border:1.5px solid var(--line);background:transparent}.quiet{padding:8px 12px;min-height:46px;background:transparent;color:var(--green);font-size:17px}.shell{max-width:760px;margin:0 auto;padding:22px 22px 120px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:22px}.brand{font-size:20px;font-weight:800;letter-spacing:.02em}.mark{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:10px;background:var(--green);color:#fff6d7;margin-right:10px}.eyebrow{font-size:15px;color:var(--muted);margin:0 0 6px;letter-spacing:.08em}h1{font-size:36px;line-height:1.25;margin:10px 0 14px}h2{font-size:27px;margin:0 0 14px}p{margin:12px 0}.intro{font-size:20px;color:var(--muted)}.dates{display:flex;gap:8px;overflow:auto;margin:20px -4px;padding:4px}.date-button{flex:0 0 auto;font-size:18px;padding:12px 16px}.date-button.active{background:var(--green);color:white}.panel{border-radius:26px;background:white;border:1px solid var(--line);padding:26px;margin:20px 0}.lesson-summary{display:flex;align-items:center;gap:18px}.today-circle{width:74px;height:74px;border-radius:24px;background:#f6e7bd;display:grid;place-items:center;font-size:32px;flex-shrink:0}.lesson-summary h2{margin:0;font-size:25px}.small{font-size:16px;color:var(--muted)}.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.full{width:100%}.progress-line{display:block;width:100%;border:0;appearance:none;height:7px;border-radius:20px;background:var(--line);overflow:hidden;margin-bottom:24px}.progress-line::-webkit-progress-bar{background:var(--line)}.progress-line::-webkit-progress-value{background:var(--green)}.progress-line::-moz-progress-bar{background:var(--green)}.step-meta{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;font-size:17px;color:var(--muted)}.action{font-size:44px;margin:4px 0 16px}.instruction{font-size:24px;line-height:1.65;margin:0 0 24px}.child-text{background:white;border:2px solid var(--line);border-radius:26px;min-height:150px;padding:27px 18px;text-align:center;font-family:Arial,sans-serif;font-size:clamp(40px,10vw,68px);font-weight:650;line-height:1.35;overflow-wrap:break-word;white-space:pre-line;display:flex;align-items:center;justify-content:center}.child-text.sentence{font-size:clamp(32px,7.6vw,48px);text-align:left;justify-content:flex-start;min-height:155px}.child-text.write-text{font-family:inherit;font-size:28px;min-height:110px}.hint{margin-top:20px;border-radius:20px;background:#f7ecd0;padding:18px 20px;font-size:20px}.hint .english{font:600 28px/1.4 Arial,sans-serif;margin-bottom:12px}.sound{font:20px/1.5 Arial,sans-serif}.step-image{display:block;max-width:100%;width:100%;height:auto;max-height:56vh;object-fit:contain;background:white;border-radius:20px;margin:16px 0}.source-toggle{margin:18px 0}.score-label{font-size:17px;color:var(--muted);margin-top:24px}.score-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.score-grid button{font-size:18px;min-height:63px;padding:12px 8px}.saved-score{padding:16px;background:var(--soft);border-radius:18px;font-size:19px;margin-top:20px}.bottom-nav{position:fixed;bottom:0;left:0;right:0;background:rgba(250,247,240,.97);border-top:1px solid var(--line);padding:14px 22px calc(14px + env(safe-area-inset-bottom));z-index:4}.nav-inner{max-width:716px;margin:auto;display:grid;grid-template-columns:1fr 2fr;gap:12px}.nav-inner button{font-size:23px}.choices{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:24px 0}.choice{padding:12px 5px;border:2px solid var(--line);background:white;min-height:126px;border-radius:20px}.choice svg{width:100%;height:80px}.choice.selected{border-color:var(--green);background:var(--soft)}.feedback{font-size:23px;background:var(--soft);padding:18px;border-radius:18px}.diagram{width:170px;height:130px;margin:18px auto;display:block}.writing{background:white;border:2px dashed var(--line);border-radius:22px;display:block;width:100%;height:210px;touch-action:none;margin:18px 0}.upload-form{display:grid;gap:18px}.upload-form label{font-weight:700}.upload-form input{width:100%;padding:14px;border:1px solid var(--line);border-radius:14px;background:white;font-size:18px}.file-list{font-size:17px;overflow-wrap:anywhere;padding-left:23px}.file-list li{margin-bottom:12px}.login{max-width:460px;margin:12vh auto;padding:26px}.login input{width:100%;font-size:32px;letter-spacing:.25em;text-align:center;padding:18px;border:1px solid var(--line);border-radius:18px;margin:18px 0}.loading{padding:40px}.record-item{display:flex;justify-content:space-between;gap:20px;border-top:1px solid var(--line);padding:14px 0}.finish-icon{font-size:70px;text-align:center}.notice{border-left:5px solid var(--gold);padding:15px;background:#fff0cd;border-radius:12px;font-size:19px}#toast{position:fixed;bottom:110px;left:50%;transform:translateX(-50%);background:#243d36;color:white;border-radius:16px;padding:12px 18px;max-width:90vw;font-size:17px;z-index:10;display:none}.tap-pad{padding:25px;border-radius:25px;background:#f6e7bd;text-align:center;font-size:29px;user-select:none}.tap-pad.active{background:var(--green);color:white}.back-link{margin-bottom:16px}.error{color:#963b30}.empty{padding:20px;background:white;border-radius:22px}@media(min-width:650px){.shell{padding-top:32px}.child-text{min-height:210px}.instruction{font-size:27px}.action{font-size:52px}}@media(max-width:360px){.shell{padding-left:16px;padding-right:16px}.instruction{font-size:22px}.score-grid button{font-size:16px}.choices{gap:6px}.panel{padding:20px}}
.nav-inner{grid-template-columns:1.15fr 1.85fr}.nav-inner button{padding:12px 16px;min-height:64px;white-space:nowrap}.child-text:not(.sentence):not(.write-text){font-size:clamp(48px,12vw,68px)}

.score-grid button.selected{background:var(--green);color:white;box-shadow:inset 0 0 0 2px var(--green)}