/* Base styles copied from 50 Study River packages/app/index.html (2026-09-07). */

:root{--ink:#1c1c1c;--paper:#fafaf7;--sub:#5b6273;--line:#e5e1d8;--accent:#0d5589}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Hiragino Sans","Hiragino Kaku Gothic ProN",system-ui,sans-serif;color:var(--ink);background:var(--paper);line-height:1.7}
#app{max-width:720px;margin:0 auto;padding:16px 16px 60px}
h1{font-size:20px;font-weight:800;padding:10px 0}
h1 a{color:inherit;text-decoration:none}
h2{font-size:16px;font-weight:800;margin:18px 0 8px}
.grp{margin:14px 0 0;font-size:12.5px;font-weight:800;color:var(--sub);letter-spacing:.05em}
.choices button{font-size:13.5px;padding:8px 13px}
.footer a{color:var(--sub)}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;margin:12px 0}
.sub{color:var(--sub);font-size:13px}
button{font:inherit;cursor:pointer;border-radius:12px;border:1px solid var(--line);background:#fff;padding:10px 16px;font-weight:700}
button.primary{background:var(--accent);border-color:var(--accent);color:#fff}
button.ghost{border:none;background:none;color:var(--accent);padding:6px 8px}
button:disabled{opacity:.4;cursor:default}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:10px 0}
.choices button.on{background:var(--ink);color:#fff;border-color:var(--ink)}
.numgrid{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0}
.numgrid button{width:44px;height:44px;padding:0;border-radius:10px}
.numgrid button.wrong{background:#1c1c1c;color:#fff;border-color:#1c1c1c;text-decoration:line-through}
iframe.preview{width:100%;aspect-ratio:210/297;border:1px solid var(--line);border-radius:8px;background:#fff}
nav.tabs{display:flex;gap:6px;margin:8px 0 4px}
nav.tabs button{border-radius:100px;padding:7px 14px;font-size:13px}
nav.tabs button.on{background:var(--ink);color:#fff;border-color:var(--ink)}
.hist{display:flex;justify-content:space-between;gap:10px;border-top:1px solid var(--line);padding:10px 2px;font-size:13.5px}
.skillrow{display:flex;align-items:center;gap:10px;border-top:1px solid var(--line);padding:8px 2px;font-size:13.5px}
.skillrow .name{flex:1;min-width:0}
.skillrow .ladder{color:var(--accent);font-size:11px;letter-spacing:1.5px;white-space:nowrap}
.spark{flex:none;display:block}
.footer{margin-top:26px;font-size:11.5px;color:var(--sub);text-align:center}
input[type=text]{font:inherit;border:1px solid var(--line);border-radius:10px;padding:9px 12px;width:100%}

[hidden]{display:none!important}
a{color:var(--accent)}
button:focus-visible,summary:focus-visible,select:focus-visible,a:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
.app-header{display:flex;align-items:center;justify-content:space-between;gap:12px}
h1 .sub{font-weight:600;white-space:nowrap}
.card>h2:first-child{margin-top:0}
.status:empty{display:none}
.status{margin:8px 0}
.status.error,#work-status.error{color:#a33}
.select-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
label{display:block;font-size:13px;color:var(--sub)}
select{display:block;width:100%;min-width:0;font:inherit;color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:10px;padding:10px 9px;margin-top:5px}
fieldset{border:0;min-width:0;margin-top:18px}
legend{font-size:16px;font-weight:800}
legend .sub{font-weight:400;margin-left:8px}
.levels{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:8px;margin-bottom:2px}
.levels button{padding:8px 2px;min-height:60px;display:flex;flex-direction:column;align-items:center}
.levels .level-count{font-size:11px;font-weight:400}
button.ghost{font-size:12px}
.section-heading{display:flex;justify-content:space-between;align-items:center;gap:12px}
.section-heading h2{margin:0}
.section-heading button{font-size:13px;flex-shrink:0}
#questions{padding-left:24px;margin:18px 0}
#questions li{padding:12px 0;border-bottom:1px solid var(--line)}
#questions li p{margin:0 0 6px}
#questions details{font-size:13px;color:var(--sub)}
#questions summary{cursor:pointer;color:var(--accent);width:fit-content}
#questions details p{margin-top:6px;color:var(--ink)}
.file-menu{position:relative;flex-shrink:0;font-size:13px}
.file-menu>summary{cursor:pointer;list-style:none;border:1px solid var(--line);background:#fff;border-radius:10px;padding:8px 12px;font-weight:700}
.file-menu>summary::-webkit-details-marker{display:none}
.file-actions{position:absolute;right:0;top:calc(100% + 6px);z-index:5;min-width:184px;padding:6px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 6px 20px #0000000e}
.file-actions button{display:block;width:100%;text-align:left;border:0;border-radius:6px;font-size:13px;white-space:nowrap}
.file-actions button:hover{background:var(--paper)}
#history{list-style:none;margin-top:12px}
#history button{display:block;width:100%;text-align:left;border:0;border-top:1px solid var(--line);border-radius:0;padding:12px 0;font-weight:400}
.history-title{display:block;font-size:14px;font-weight:700}
.history-meta{display:block;font-size:12px;color:var(--sub)}
.footer p+p{margin-top:8px}
@media(max-width:480px){.select-row{grid-template-columns:1fr}.levels{gap:5px}.levels button{border-radius:9px}h1{font-size:18px}h1 .sub{font-size:12px}.card{padding:16px}.choices button{padding:8px 11px}.levels button{padding:8px 0}.app-header{gap:8px}}