@charset "UTF-8";
:root{--ink:#173c37;--muted:#697d73;--green:#126c62;--line:#e1e9e2;--paper:#f3f6f1;--white:#fff;--radius:18px;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none;font-size:16px}
*{box-sizing:border-box}body{margin:0;-webkit-text-size-adjust:100%;overflow-wrap:break-word}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent;touch-action:manipulation}button{border:0;color:inherit;cursor:pointer}button:disabled{opacity:.45;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #75bda9;outline-offset:3px}h1,h2,h3,p{margin:0}h2{font-size:22px;line-height:1.45}h3{font-size:18px;line-height:1.5}p{line-height:1.8}small{color:var(--muted)}[hidden]{display:none!important}.icon{width:22px;height:22px;flex-shrink:0;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.svg-library{position:absolute;width:0;height:0;overflow:hidden}.workspace{max-width:560px;margin:0 auto;min-height:100vh}.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:12px;height:calc(56px + env(safe-area-inset-top,0px));padding:env(safe-area-inset-top,0px) 14px 0;background:#f8faf6;border-bottom:1px solid var(--line)}.topbar h1{flex:1;font-size:18px;line-height:1.35;text-align:center;min-width:0}.back-link,.account{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:44px;height:44px;border-radius:14px;color:var(--green);background:#eaf2e8}.back-link .icon{transform:rotate(180deg)}body[data-page=home] .back-link .icon{transform:none}.shell{padding:16px 16px calc(88px + env(safe-area-inset-bottom,0px))}.page-heading{margin-bottom:18px}.book-switch{display:flex;align-items:center;gap:12px;min-height:66px;padding:12px 14px;background:#fff;border:1px solid var(--line);border-radius:16px}.book-switch>.icon{color:var(--green);flex:0 0 22px;width:22px}.book-switch>span:not(.icon){min-width:0;flex:1}.book-switch small{display:block;font-size:11px;margin-bottom:3px}.book-switch strong{display:block;font-size:14px;line-height:1.5;font-weight:600;overflow-wrap:anywhere}.book-switch b{display:flex;align-items:center;gap:4px;color:var(--green);font-size:12px;white-space:nowrap}.book-switch b .icon{width:16px;height:16px}.hero{padding:24px;border-radius:22px;background:#126c62;color:#fff}.hero-tag{font-size:12px;color:#c7e7d7}.hero h2{font-size:25px;margin:10px 0 8px}.hero p{font-size:14px;color:#d6e8df;margin-bottom:20px}.hero .button{width:100%}.button{display:inline-flex;justify-content:center;align-items:center;gap:8px;min-height:48px;padding:12px 18px;background:var(--green);color:#fff;border:1px solid transparent;border-radius:13px;font-size:15px;font-weight:600;line-height:1.45;text-align:center}.button .icon{width:18px;height:18px}.button.cream{background:#f1e8cd;color:var(--ink)}.button.secondary{background:#fff;color:var(--green);border-color:#d0ddd3}.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;min-width:0}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:24px 0 12px}.section-heading h2{font-size:18px}.section-heading>span,.section-heading>a{font-size:12px;color:var(--muted)}.feature-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.feature{position:relative;padding:18px 15px;min-height:154px}.feature-icon{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:13px;background:#def0e4;color:#338572;margin-bottom:14px}.feature>small{display:none}.feature h3{font-size:16px;margin-bottom:6px}.feature p{font-size:12px;line-height:1.7;color:var(--muted)}.feature-arrow{position:absolute;top:20px;right:12px;color:#9eb3a3}.feature-arrow .icon{width:16px;height:16px}.peach .feature-icon{background:#faead9;color:#ac733f}.lavender .feature-icon{background:#eee8f7;color:#8b75b0}.blue 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4px;background:#e4eedb;border-left:5px solid #a7c19d;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:9px}.book-cover small{font-size:10px;text-align:center}.book-cover strong{font-size:22px}.book-cover span{font-size:10px}.badge{display:inline-block;padding:5px 9px;background:#edf5e9;color:var(--green);border-radius:7px;font-size:11px}.unit-tabs{display:flex;flex-wrap:nowrap;gap:8px;overflow-x:auto;max-width:100%;margin:16px 0;padding-bottom:6px;scrollbar-width:none;-webkit-overflow-scrolling:touch}.unit-tabs::-webkit-scrollbar{display:none}.unit-tabs a{display:flex;align-items:center;justify-content:center;min-height:44px;flex-shrink:0;padding:10px 14px;background:#fff;border:1px solid var(--line);border-radius:12px;font-size:14px;white-space:nowrap}.unit-tabs a.on,.sound-tabs a.on{background:var(--green);border-color:var(--green);color:#fff}.lesson-list{display:grid;gap:10px}.lesson-row{display:flex;align-items:center;gap:12px;padding:18px 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footer{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:14px;padding-top:10px;border-top:1px solid var(--line)}.word-card footer>span{font-size:12px;color:var(--muted);min-width:0}.round{display:inline-flex;align-items:center;justify-content:center;width:46px;height:46px;min-width:46px;border-radius:15px;background:#edf5e9;color:var(--green);vertical-align:middle}.round .icon{width:22px;height:22px}.save{display:inline-flex;align-items:center;justify-content:center;gap:5px;min-height:44px;min-width:72px;padding:8px;background:transparent;color:#74897b;font-size:13px;white-space:nowrap}.save .icon{width:18px;height:18px}.save.saved{color:#a26d24}.saved .icon{fill:#f8eac8}.more{display:flex;width:100%;margin:20px auto}.reader{padding:22px 18px}.reader-heading{padding-bottom:18px;margin-bottom:18px;border-bottom:1px solid var(--line)}.reader-heading h2{font-size:24px;line-height:1.5;margin:12px 0 18px;overflow-wrap:anywhere}.reader-actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.reader-actions button{padding:10px;font-size:14px;min-height:44px}.lesson-image{display:block;max-width:100%;height:auto;margin:18px auto;object-fit:contain}.subtitle .sentence{font-size:20px;line-height:1.85;overflow-wrap:anywhere;margin:0}.translation{font-size:15px;line-height:1.8;color:var(--muted);margin:8px 0 18px}.hide-translation .translation{display:none}.text-segment{padding:12px 10px;border-radius:12px;margin:0 -6px 8px;scroll-margin-top:210px}.text-segment.active{background:#e5f3e9}.seek{display:block;width:100%;min-height:44px;padding:6px 0;text-align:left;border:0;background:transparent;font-size:20px;line-height:1.85}.player{position:sticky;top:calc(56px + env(safe-area-inset-top,0px));z-index:10;margin:0 0 14px;padding:14px;background:#fff;box-shadow:0 5px 18px #173c370a}.player audio{width:100%;display:block;height:44px;margin:0 0 8px}audio{max-width:100%;width:100%}.player-options{display:flex;align-items:center;flex-wrap:wrap;gap:6px 14px;font-size:12px}.player-options label{display:flex;align-items:center;gap:6px;min-height:44px}.player-options select{display:inline-block;width:auto;min-height:44px;padding:8px;font-size:14px}.lesson-directory{margin-top:18px;padding:18px}.lesson-directory summary{font-size:15px;font-weight:600;min-height:32px;cursor:pointer}.lesson-directory .quick-links{margin-top:12px}.word-detail h2{font-size:38px;line-height:1.4;overflow-wrap:anywhere;margin:16px 0}.word-detail h3{font-size:18px;margin:24px 0 12px}.word-detail>.toolbar{display:grid;grid-template-columns:1fr 1fr}.word-detail>.toolbar a{grid-column:1/-1}.example{padding:16px 0;border-top:1px solid var(--line)}.example>p:first-child{font-size:18px;line-height:1.8;overflow-wrap:anywhere}.training{padding:22px 18px}.training h2{font-size:24px;margin-top:14px}.card form{display:grid;gap:12px;margin-top:18px}.card form>label{font-size:14px;margin-top:6px}.card form>button{width:100%;justify-self:stretch;margin-top:8px}.training-progress{display:flex;justify-content:space-between;gap:12px;font-size:14px;margin:20px 0 16px}.training-question{font-size:25px;line-height:1.6;margin:20px 0;overflow-wrap:anywhere}.training-answer{width:100%;margin-bottom:8px}.answer-options{display:grid;gap:10px;margin:18px 0}.answer-options button:not(.button){min-height:50px;padding:14px;text-align:left;border:1px solid var(--line);border-radius:12px;background:#fff;font-size:16px}.answer-feedback{padding:16px;background:#edf5e8;border-radius:12px;line-height:1.8;margin:18px 0}.answer-feedback.wrong{background:#faefe1;color:#986033}#training-stage>.button{width:100%;margin-top:12px}.profile-card{display:flex;align-items:flex-start;gap:14px;flex-wrap:wrap}.profile-card>div:nth-child(2){flex:1;min-width:0}.profile-card h2{font-size:20px}.profile-card p{font-size:13px;color:var(--muted);margin-top:6px;overflow-wrap:anywhere}.profile-card>a{min-height:44px;display:flex;align-items:center;font-size:14px;color:var(--green);width:100%;justify-content:center;background:#eef5e9;border-radius:10px}.avatar{width:52px;height:52px;border-radius:17px;background:#e5f0df;color:var(--green);display:flex;align-items:center;justify-content:center;flex-shrink:0}.avatar .icon{width:28px;height:28px}.stats{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:16px 0}.stats>div{display:flex;flex-direction:column;gap:8px;padding:18px}.stats strong{font-size:29px;color:var(--green)}.stats span{font-size:12px;line-height:1.6}.feedback-item{margin-top:14px}.feedback-item p{font-size:15px;margin:14px 0;white-space:pre-wrap}.feedback-item blockquote{font-size:14px;line-height:1.8;background:#edf5e9;border-left:3px solid #9bb69b;padding:14px;margin:8px 0;overflow-wrap:anywhere}.article-grid{display:grid;grid-template-columns:1fr;gap:14px}.article-card{padding:0;overflow:hidden}.article-card>img{display:block;width:100%;height:170px;object-fit:cover}.article-cover{height:130px;background:#e4eee1;display:flex;align-items:center;justify-content:center;color:var(--green)}.article-cover .icon{width:44px;height:44px}.article-card>div:last-child{padding:20px}.article-card h2{font-size:19px;margin:8px 0}.article-card small{font-size:10px}.article-card p{display:flex;justify-content:space-between;color:var(--muted);font-size:12px}.prose{font-size:16px;line-height:1.9;overflow-wrap:anywhere}.prose p{margin:14px 0}.prose img{max-width:100%;height:auto}.prose table{display:block;max-width:100%;overflow-x:auto;font-size:14px}.prose h2{font-size:23px;line-height:1.55;margin-bottom:16px}.prose h3{margin:18px 0 10px}.prose details{border-top:1px solid var(--line);padding:12px 0}.prose summary{min-height:44px;line-height:1.6;cursor:pointer;font-weight:600;padding:8px 0}.prose a{color:var(--green)}.prose a.button{color:white}.picture-card>img{display:block;width:100%;max-height:230px;object-fit:contain;border-radius:12px;margin-bottom:16px}.picture-card details{margin-top:12px;font-size:15px}.picture-card summary{min-height:44px;padding:10px 0;cursor:pointer}.picture-card .word-head h3{font-size:25px}.sound-tabs{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0}.sound-tabs a{display:flex;align-items:center;justify-content:center;min-width:48px;min-height:48px;padding:10px 13px;background:white;border:1px solid var(--line);border-radius:12px;font-size:18px}.pronunciation h2{font-size:36px;margin-bottom:18px}.pronunciation>.button{width:100%;margin:12px 0}.pronunciation p{line-height:1.9;margin:12px 0;overflow-wrap:anywhere}.mouth-image{max-width:100%;height:auto;display:block;margin:18px auto}#speak-word{margin-top:10px}body[data-page=speak] .toolbar{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}body[data-page=speak] .toolbar>.button{width:100%;padding:12px 8px}#speech-score{grid-column:1/-1}#record-status{font-size:14px;line-height:1.8}#speech-result{margin-top:18px}#toast{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(88px + env(safe-area-inset-bottom,0px));z-index:60;max-width:calc(100% - 32px);width:max-content;padding:13px 18px;border-radius:12px;background:#183f37;color:#fff;font-size:14px;line-height:1.6;box-shadow:0 6px 24px #173c3725}dialog{position:fixed;inset:auto 0 0;margin:0 auto;width:100%;max-width:560px;max-height:85vh;overflow-y:auto;padding:24px 20px calc(24px + env(safe-area-inset-bottom,0px));border:0;border-radius:24px 24px 0 0;background:#fff;color:var(--ink);z-index:70}dialog::backdrop{background:#173c3770}dialog h2{font-size:22px}dialog form{display:grid;gap:12px}dialog .toolbar{display:grid;grid-template-columns:1fr 1fr}dialog .toolbar button{width:100%}.dialog-fallback::after{content:"";position:fixed;inset:0;background:#173c3770;z-index:65}.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}
@media(max-width:350px){.shell{padding-left:12px;padding-right:12px}.hero{padding:20px}.hero h2{font-size:23px}.feature{padding:16px 12px}.reader{padding:18px 14px}.player-options{gap:4px 8px}.section-heading>span{display:none}.word-detail>.toolbar{grid-template-columns:1fr}.button{padding:12px 14px}}
body.is-editing .bottom-nav{display:none}body.is-editing #toast{bottom:20px}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

/* Legacy pronunciation emphasis, scoped to the pronunciation content. */
.pronunciation .text-red{color:#c53735;font-weight:600}

/* Persistent fallback for blocked playback; also stays inside native dialogs. */
.audio-recovery{position:fixed;z-index:1100;left:12px;right:12px;bottom:calc(88px + env(safe-area-inset-bottom));max-width:540px;margin:0 auto;padding:12px 14px;border:1px solid #d0e2db;border-radius:14px;background:#fff;box-shadow:0 6px 24px #163c3026;display:flex;align-items:center;gap:12px;color:#244c43;font-size:13px;line-height:1.5}.audio-recovery span{flex:1;min-width:0}.audio-recovery .button{flex:none;white-space:nowrap;padding:10px 14px;font-size:14px}dialog .audio-recovery{position:sticky;bottom:12px;margin:12px;max-width:none}