.xixi-app{--xixi-ink:#243b42;--xixi-green:#236859;--xixi-paper:#fffdf7;--xixi-border:#d9e4de;color:var(--xixi-ink);background:var(--xixi-paper);border:1px solid var(--xixi-border);border-radius:18px;padding:clamp(18px,3vw,36px);font:18px/1.65 system-ui,-apple-system,"Noto Sans SC","Microsoft YaHei",sans-serif;max-width:1200px;margin:24px auto;box-sizing:border-box}.xixi-app *{box-sizing:border-box}.xixi-app h2,.xixi-app h3,.xixi-app h4{color:var(--xixi-ink);line-height:1.3;margin:0 0 12px}.xixi-app h2{font-size:clamp(25px,4vw,36px)}.xixi-app h3{font-size:26px}.xixi-app h4{font-size:21px}.xixi-app p{margin:8px 0 16px;white-space:pre-line;overflow-wrap:anywhere}.xixi-app .xixi-header{display:flex;justify-content:space-between;align-items:start;gap:20px}.xixi-app button,.xixi-app input,.xixi-app select,.xixi-app textarea{font:inherit}.xixi-app button,.xixi-app .xixi-actions a{display:inline-block;min-height:44px;border:1px solid var(--xixi-green);background:#fff;color:var(--xixi-green);border-radius:9px;padding:9px 16px;text-decoration:none;cursor:pointer}.xixi-app button:hover,.xixi-app .xixi-actions a:hover{background:#eaf4ee}.xixi-app button:disabled{opacity:.55;cursor:wait}.xixi-app button.xixi-primary,.xixi-app button.is-active{color:#fff;background:var(--xixi-green)}.xixi-app :focus-visible{outline:3px solid #b16413;outline-offset:3px}.xixi-app .xixi-nav{display:flex;flex-wrap:wrap;gap:9px;border-bottom:1px solid var(--xixi-border);padding:14px 0 22px;margin-bottom:18px}.xixi-app .xixi-status{min-height:28px;color:#426252;margin:8px 0}.xixi-app .xixi-error{color:#a22828;font-weight:600}.xixi-app .xixi-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,245px),1fr));gap:16px;margin:18px 0 26px}.xixi-app .xixi-card{background:#fff;border:1px solid var(--xixi-border);border-radius:12px;padding:20px;overflow-wrap:anywhere}.xixi-app .xixi-pinyin{font-size:18px;color:#61716a;letter-spacing:.02em}.xixi-app .xixi-note{background:#f1f5ed;border-left:4px solid #93af80;padding:12px 16px;font-size:16px}.xixi-app .xixi-field{display:flex;flex-direction:column;gap:6px;margin:0 0 16px;font-weight:600;min-width:0}.xixi-app .xixi-field input,.xixi-app .xixi-field select,.xixi-app .xixi-field textarea{width:100%;min-height:46px;background:#fff;border:1px solid #93a59b;border-radius:7px;padding:9px 12px;color:#243b42;font-weight:400}.xixi-app textarea{resize:vertical}.xixi-app .xixi-form{padding:22px;background:#f7f9f4;border:1px solid var(--xixi-border);border-radius:12px;max-width:800px}.xixi-app .xixi-toolbar{display:flex;flex-wrap:wrap;gap:18px;align-items:end}.xixi-app .xixi-toolbar .xixi-field{flex:1;min-width:220px;max-width:480px}.xixi-app .xixi-actions{display:flex;gap:12px;flex-wrap:wrap}.xixi-app .xixi-question{border-bottom:1px solid var(--xixi-border);padding:12px 0}.xixi-app .xixi-idiom{max-width:850px;margin-top:10px}.xixi-app .xixi-idiom h3{font-size:34px}.xixi-app .xixi-idiom time{display:block;color:#65766b;font-size:16px;margin-bottom:12px}.xixi-app fieldset{border:1px solid var(--xixi-border);padding:15px;margin-top:20px}.xixi-app fieldset button{margin:5px}.xixi-app a{color:var(--xixi-green);text-decoration:underline}.xixi-app .xixi-panel{min-height:170px}@media(max-width:550px){.xixi-app{font-size:17px;margin:10px 0;padding:18px}.xixi-app .xixi-header{flex-direction:column;gap:8px}.xixi-app .xixi-nav button{flex:1 1 42%;padding:9px}.xixi-app .xixi-form{padding:16px}.xixi-app .xixi-toolbar .xixi-field{min-width:100%}.xixi-app .xixi-idiom h3{font-size:30px}}@media print{.xixi-app{border:0;background:white;color:black;padding:0;font-size:12pt}.xixi-app .xixi-nav,.xixi-app button,.xixi-app .xixi-actions,.xixi-app .xixi-status{display:none}.xixi-app .xixi-card{break-inside:avoid}.xixi-app .xixi-grid{display:block}}

/* Self-contained learning UI. No theme-wide selectors or remote assets. */
.xixi-app{--xixi-ink:#183d40;--xixi-green:#176653;--xixi-paper:#fafbf7;--xixi-border:#dce7df;width:100%;max-width:1180px;border-radius:26px;padding:clamp(18px,4vw,42px);box-shadow:0 14px 48px #183d400a;isolation:isolate}
.xixi-app .xixi-header{padding-bottom:18px;gap:24px}.xixi-app .xixi-header h2{font-size:clamp(27px,3.5vw,40px);letter-spacing:-.035em;margin:10px 0}.xixi-app .xixi-header p{color:#536c68;font-size:17px;margin-bottom:12px}.xixi-app .xixi-header>button{flex-shrink:0;border-color:var(--xixi-border);border-radius:100px;background:#fff;font-size:15px;font-weight:700}
.xixi-app .xixi-eyebrow{display:block;font-size:12px;letter-spacing:.12em;font-weight:750;color:#416d61}.xixi-app .xixi-mode{display:inline-block;width:fit-content;margin:8px 12px 14px 0;padding:5px 11px;background:#e8f2ec;color:#245d4f;border:1px solid #cee1d5;border-radius:50px;font-size:13px;font-weight:700;vertical-align:middle}
.xixi-app .xixi-nav{gap:7px;padding:7px;background:#edf2ed;border:1px solid #e0e8df;border-radius:16px;margin:0 0 8px}.xixi-app .xixi-nav button{flex:1 1 auto;min-height:48px;border:0;background:transparent;border-radius:11px;color:#41625a;font-size:16px;font-weight:650;padding:10px 12px}.xixi-app .xixi-nav button:hover{background:#fff}.xixi-app .xixi-nav button.is-active{background:var(--xixi-green);color:#fff;box-shadow:0 3px 8px #17665320}.xixi-app .xixi-status:empty{min-height:10px;margin:0}
.xixi-app .xixi-welcome{display:grid;grid-template-columns:minmax(0,1fr) 150px;align-items:center;gap:22px;background:#e9f3ec;border:1px solid #d4e6d9;border-radius:20px;padding:clamp(22px,3vw,34px);margin:16px 0}.xixi-app .xixi-welcome h3{font-size:clamp(25px,3vw,34px);line-height:1.4;margin:10px 0}.xixi-app .xixi-welcome p{color:#45655b;font-size:17px;margin:0;max-width:48ch}.xixi-app .xixi-word-art{display:grid;grid-template-columns:repeat(2,1fr);gap:9px;transform:rotate(-7deg);padding:8px}.xixi-app .xixi-word-art span{display:grid;place-items:center;aspect-ratio:1;background:#fffdf4;border:2px solid #fff;border-radius:16px;font-size:35px;font-weight:750;box-shadow:0 5px 0 #cfdfd2;color:#22624e}.xixi-app .xixi-word-art span:nth-child(2){transform:translateY(20px) rotate(13deg);background:#ffdf8d;color:#67470e}.xixi-app .xixi-word-art span:nth-child(3){background:#dbe9f8;color:#2f5876;transform:translateX(8px) rotate(6deg)}
.xixi-app .xixi-start-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:16px 0 32px}.xixi-app .xixi-start-card{background:#fff;border:1px solid var(--xixi-border);border-radius:16px;padding:18px;position:relative}.xixi-app .xixi-step{display:block;color:#658273;font-size:12px;letter-spacing:.1em;font-weight:750;margin-bottom:6px}.xixi-app .xixi-start-card button{display:block;text-align:left;border:0;border-radius:5px;padding:0;min-height:36px;background:transparent;color:var(--xixi-ink);font-weight:750;font-size:19px}.xixi-app .xixi-start-card button:hover{text-decoration:underline;text-underline-offset:4px}.xixi-app .xixi-start-card p{font-size:14px;line-height:1.6;color:#536c68;margin:7px 0 0}.xixi-app .xixi-section-title{font-size:25px;margin:10px 0 20px}
.xixi-app .xixi-card{border-radius:17px;box-shadow:0 3px 0 #e7eee650;padding:24px}.xixi-app .xixi-vocab-card{border-top:4px solid #a9cdb5}.xixi-app .xixi-vocab-card:nth-child(3n+2){border-top-color:#e4c67e}.xixi-app .xixi-vocab-card:nth-child(3n){border-top-color:#b0c8e1}.xixi-app .xixi-vocab-card h3{font-size:clamp(32px,4vw,42px);line-height:1.4;font-weight:750;letter-spacing:.04em}.xixi-app .xixi-pinyin{color:#5b7068;margin-top:0}.xixi-app .xixi-note{border-radius:0 12px 12px 0;background:#f0f3e9;border-color:#9bb58d;line-height:1.65}.xixi-app .xixi-form{max-width:none;border-radius:18px;padding:26px;background:#f0f5ef}.xixi-app .xixi-field input,.xixi-app .xixi-field select,.xixi-app .xixi-field textarea{border-radius:10px;min-height:50px;border-color:#a9beb0}.xixi-app .xixi-field input:hover,.xixi-app .xixi-field select:hover{border-color:#477f65}.xixi-app .xixi-question{padding:18px 0}.xixi-app .xixi-question input{font-size:24px}.xixi-app .xixi-idiom{max-width:none;padding:clamp(22px,4vw,40px)}.xixi-app .xixi-idiom h3{font-size:clamp(32px,5vw,46px);letter-spacing:.06em}.xixi-app .xixi-idiom h4{margin-top:26px;font-size:19px;color:#386b59}.xixi-app .xixi-idiom p{max-width:72ch}.xixi-app fieldset{border-radius:14px;background:#f6f8f2}.xixi-app legend{font-weight:700;padding:0 8px}.xixi-app .xixi-paper-list{display:grid;gap:12px;margin:20px 0}.xixi-app .xixi-panel>h3{margin-top:20px}.xixi-app .xixi-card>button{margin:6px 8px 0 0}.xixi-app button,.xixi-app a{touch-action:manipulation}.xixi-app button{transition:background-color .15s,color .15s}.xixi-app :focus-visible{outline:3px solid #ad5d12;outline-offset:4px}
@media(max-width:650px){.xixi-app .xixi-welcome{grid-template-columns:1fr;padding:22px}.xixi-app .xixi-word-art{display:none}.xixi-app .xixi-start-grid{grid-template-columns:1fr;gap:9px}.xixi-app .xixi-start-card{padding:14px 18px}.xixi-app .xixi-step{float:right;margin:5px 0 0 12px}.xixi-app .xixi-start-card p{margin-top:3px}.xixi-app .xixi-header{gap:12px}.xixi-app .xixi-nav button{flex:1 1 40%;font-size:15px}.xixi-app .xixi-card,.xixi-app .xixi-form{padding:19px}.xixi-app .xixi-grid{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){.xixi-app button{transition:none}}
@media print{.xixi-app{width:auto;max-width:none;box-shadow:none;border:0;padding:0;background:white}.xixi-app .xixi-welcome,.xixi-app .xixi-start-grid,.xixi-app .xixi-mode,.xixi-app .xixi-eyebrow{display:none}.xixi-app .xixi-card{box-shadow:none;border:1px solid #bbb;padding:12px}.xixi-app .xixi-paper-list{display:block}.xixi-app .xixi-paper-list .xixi-card{margin:0 0 10px}.xixi-app .xixi-note{background:white;color:black}}
.xixi-app .xixi-field input[type=checkbox]{width:24px;min-height:24px;height:24px;accent-color:var(--xixi-green)}
@media print{.xixi-app .xixi-paper-marking{display:none}}
.xixi-app button.xixi-danger{border-color:#a73b39;color:#8f2d2b;background:#fff7f5}.xixi-app button.xixi-danger:hover{background:#fce8e3}