:root{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP","Yu Gothic",sans-serif;color:#34272b;background:var(--page);--accent:#8e1729;--pale:#f6e9ec;--border:#e5d9dc;--page:#faf7f7;--muted:#75656a;--shadow:0 5px 24px #46212a10;font-synthesis:none}
*{box-sizing:border-box}body{margin:0}body.kanji{color:inherit;background:inherit}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer;border:0;min-height:44px;border-radius:12px;font-weight:650;padding:12px 18px;color:var(--accent);background:var(--pale)}button:disabled{opacity:.5;cursor:default}button:hover:not(:disabled){filter:brightness(.96)}a{color:var(--accent)}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #8e1729;outline-offset:3px}header{max-width:980px;margin:auto;padding:24px 30px 14px;display:flex;align-items:center;justify-content:space-between;gap:12px}.brand{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:750;color:var(--accent);text-decoration:none;white-space:nowrap}.brand-icon{width:37px;height:37px;display:grid;place-items:center;background:var(--accent);color:#fff;border-radius:12px;font-size:20px}.user-name{font-size:12px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:40%}main{max-width:900px;margin:0 auto;padding:28px 24px 125px}.eyebrow{font-size:11px;font-weight:800;letter-spacing:.15em;color:var(--accent);margin:0 0 10px}h1{font-size:30px;line-height:1.5;margin:0 0 10px;letter-spacing:.02em}h2{font-size:18px;line-height:1.5;margin:0 0 12px}h3{font-size:17px;margin:0 0 8px}p{line-height:1.75;margin:8px 0 14px}.muted{color:var(--muted)}.small{font-size:12px}.card{background:#fff;border:1px solid var(--border);border-radius:20px;padding:23px;margin:16px 0;box-shadow:var(--shadow)}.hero{position:relative;background:var(--accent);color:#fff;padding:30px;border-radius:24px;margin:20px 0 24px;overflow:hidden}.hero .muted{color:#fff}.hero .eyebrow{color:#fff}.hero h2{font-size:24px}.hero .badge{background:#ffffff20;color:#fff}.hero .primary{background:#fff;color:var(--accent)}.hero:after{content:'✦';position:absolute;right:18px;top:-35px;font-size:150px;color:#ffffff09;pointer-events:none}.badge{display:inline-block;padding:5px 10px;border-radius:8px;background:var(--pale);color:var(--accent);font-size:11px;font-weight:700;line-height:1.4}.badge.warm{background:#fcf0d9;color:#936619}.row{display:flex;justify-content:space-between;align-items:center;gap:12px}.row.wrap{flex-wrap:wrap}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.grid .card{margin:0}.two-col{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.list-row{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:16px 0;border-bottom:1px solid var(--border)}.list-row:last-child{border:0}.list-row p{margin:4px 0}.primary{background:var(--accent);color:#fff}.secondary{border:1px solid var(--border);background:#fff}.text-button{background:transparent;text-decoration:underline;font-size:13px;padding-left:0}.full{width:100%}.space-top{margin-top:14px}.empty{padding:35px 20px;text-align:center;border:1px dashed var(--border);border-radius:18px;margin:16px 0;background:#ffffff80}.empty .symbol{font-size:32px;color:var(--accent)}form{margin-top:18px}label{display:block;color:var(--muted);font-size:12px;font-weight:650;margin:14px 0}input,select,textarea{display:block;width:100%;padding:12px;border:1px solid var(--border);border-radius:10px;background:#fcfcfa;color:inherit;font-size:16px;margin-top:7px;min-width:0}textarea{resize:vertical}input[type=checkbox]{width:18px;height:18px;display:inline-block;vertical-align:middle;margin:0 8px 0 0}input[type=file]{font-size:13px}fieldset{border:1px solid var(--border);border-radius:12px;padding:12px}legend{font-size:12px;color:var(--muted)}.checks label{font-size:13px}summary{cursor:pointer;font-weight:750;min-height:28px}details[open] summary{margin-bottom:20px}details .list-row{font-size:13px}.bottom-nav{position:fixed;bottom:0;left:50%;transform:translateX(-50%);width:min(100%,900px);z-index:10;background:#ffffffed;backdrop-filter:blur(12px);display:flex;border-top:1px solid var(--border);padding:8px 12px calc(8px + env(safe-area-inset-bottom))}.bottom-nav button{flex:1;background:transparent;border-radius:13px;font-size:11px;padding:8px 5px;color:var(--muted);display:flex;flex-direction:column;align-items:center;gap:4px}.bottom-nav button span{font-size:19px;line-height:1.2}.bottom-nav button.selected{color:var(--accent);background:var(--pale)}#notice{position:fixed;z-index:40;bottom:100px;left:50%;transform:translateX(-50%);max-width:calc(100% - 32px);width:max-content;border-radius:12px;padding:12px 18px;background:var(--accent);color:white;box-shadow:0 4px 20px #0002;font-size:13px}#notice:empty{display:none}#notice.error{background:#a3443e}.auth{max-width:460px;padding-top:8vh}.auth .brand{margin-bottom:22px}.auth h1{font-size:24px}.auth .primary{width:100%;margin:10px 0}.loading{text-align:center;margin-top:20vh}dialog{width:min(700px,calc(100% - 24px));max-height:90dvh;border:1px solid var(--border);border-radius:20px;padding:22px;color:inherit}dialog::backdrop{background:#2d182099}dialog img{width:100%;height:auto;border-radius:12px}dialog iframe{width:100%;height:55dvh;border:0;border-radius:12px}.prose{white-space:pre-wrap;overflow-wrap:anywhere;font-size:16px;line-height:1.9}.meta{display:grid;grid-template-columns:90px 1fr;gap:10px;font-size:12px;color:var(--muted);margin:20px 0}.meta dd{margin:0;overflow-wrap:anywhere}.study-card{text-align:center;padding:32px 24px}.question{font-size:46px;letter-spacing:.08em;margin:22px 0}.answer{color:var(--accent);font-size:30px;background:var(--pale);border-radius:12px;padding:16px;margin:20px 0}.grade-buttons{display:grid;gap:10px;margin-top:24px}.grade-buttons button{padding:16px}.grade-buttons .wrong{background:#fcf0ed;color:#9d4c3d}.stats{display:flex;gap:14px}.stat{flex:1;background:#fff;border:1px solid var(--border);border-radius:16px;padding:18px}.stat strong{display:block;font-size:30px;margin:7px 0}.material-title{text-align:left;background:none;padding:0;font-size:16px;min-height:44px;color:inherit}.progress-bar{height:5px;background:var(--pale);border-radius:4px;margin-top:14px}.section-title{margin:26px 0 16px}.link-button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 16px;background:var(--pale);border-radius:10px;text-decoration:none;font-weight:650;font-size:13px}.callout{border-left:3px solid #c6a261;padding:8px 14px;background:#faf5e8;border-radius:0 8px 8px 0;font-size:12px;line-height:1.8}.inline-actions{display:flex;flex-wrap:wrap;gap:8px}.filter-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.filter-row label{margin:4px 0}dl{margin:0}.nowrap{white-space:nowrap}[hidden]{display:none!important}
@media(max-width:600px){header{padding:20px 20px 10px}.brand{font-size:18px}main{padding:22px 20px 120px}h1{font-size:26px}.hero{padding:25px 22px}.hero h2{font-size:22px}.grid{grid-template-columns:1fr}.two-col{grid-template-columns:1fr;gap:0}.card{padding:20px;border-radius:18px}.grid .card{display:block}.question{font-size:40px}.stats{gap:10px}.stat{padding:15px}.stat strong{font-size:28px}.list-row{align-items:flex-start}.list-row button.secondary{padding:10px;white-space:nowrap;font-size:12px}.auth{padding-top:7vh}dialog{padding:18px}.filter-row{grid-template-columns:1fr}.user-name{max-width:37%}}
.question,.list-row>div,.user-name{overflow-wrap:anywhere}.list-row>div{min-width:0}.question{line-height:1.4}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto}}
.material-open{background:var(--accent);color:#fff;border-radius:4px;text-decoration:none;font-size:13px}
.viewer-toolbar{align-items:center;margin-bottom:10px}.viewer-toolbar button{font-size:13px;padding:10px 12px}.viewer-toolbar [data-zoom-label]{min-width:42px;text-align:center;font-size:13px}.image-viewport{max-height:55dvh;overflow:auto;border:1px solid var(--border);border-radius:8px}.image-viewport .zoomable-image{display:block;width:100%;max-width:none;border-radius:0}.material-expanded{width:100%;max-width:none;height:100dvh;max-height:100dvh;margin:0;border:0;border-radius:0;padding:calc(12px + env(safe-area-inset-top)) 16px calc(16px + env(safe-area-inset-bottom))}.material-expanded iframe{height:65dvh}.material-expanded .image-viewport{max-height:65dvh}.material-expanded>.row:first-child{position:sticky;top:0;z-index:1;background:#fff}
.subject-materials{border-radius:4px;font-size:13px;width:100%;margin-top:4px}.grid .card>.row:last-child{flex-wrap:wrap}.section-options{align-items:center}.archive-toggle{display:inline-flex;align-items:center;gap:6px;min-height:44px;margin:0;font-size:12px;line-height:1.7}.archive-toggle input{margin:0;accent-color:var(--accent)}.section-title h2{margin-bottom:0}
.material-list{display:grid;grid-template-columns:minmax(0,1fr);gap:18px}.material-list>.card{margin:0;min-width:0}.material-card h3{overflow-wrap:anywhere}.inline-preview{margin-top:12px}.inline-preview .image-viewport{max-height:none}.inline-preview .zoomable-image{height:auto;-webkit-touch-callout:default}.inline-preview iframe{display:block;width:100%;height:70dvh;min-height:360px;border:1px solid var(--border);border-radius:8px}.material-card .inline-actions>*{max-width:100%}
.pdf-pages{display:grid;gap:12px}.pdf-page{display:grid;place-items:center;aspect-ratio:3/4;min-width:0;background:#fff;border:1px solid var(--border);color:var(--muted);font-size:13px;overflow:hidden}.pdf-page canvas{display:block;width:100%;height:auto}.material-preview:not(.inline-preview) .pdf-pages{max-height:60dvh;overflow:auto}.material-expanded .pdf-pages{max-height:75dvh}
.batch-inputs{border:0;padding:0;min-width:0}.batch-row{border:1px solid var(--border);border-radius:12px;padding:16px;margin:16px 0;background:#fcfafb;min-width:0}.batch-row .row strong{font-size:14px}.batch-error{color:#9d2924;overflow-wrap:anywhere}.batch-row details[open] summary{margin-bottom:8px}.batch-row details{margin-top:12px}
[data-theme=japanese]{--accent:#b42336;--pale:#fbe6e9;--border:#ebbac2;--page:#fff5f6}
[data-theme=math]{--accent:#1d4ed8;--pale:#e7efff;--border:#b7c9f2;--page:#f3f7ff}
[data-theme=science]{--accent:#187344;--pale:#e4f4e9;--border:#b6dbc4;--page:#f3faf5}
[data-theme=social]{--accent:#a34b08;--pale:#fff0de;--border:#ebcb9f;--page:#fff8f0}
[data-theme=english]{--accent:#7732ad;--pale:#f1e7fa;--border:#d4bce7;--page:#fbf5ff}
[data-theme=other]{--accent:#0e6b72;--pale:#e3f3f2;--border:#bedbd9;--page:#f3faf9}
body{background:var(--page)}
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline-color:var(--accent)}
.card[data-theme]{border-top:4px solid var(--accent);background:linear-gradient(var(--page),#fff 160px)}
dialog[data-theme]{background:var(--page)}
input[type=checkbox]{accent-color:var(--accent)}
.exam-date-row{display:flex;align-items:center;gap:12px}.exam-date-row label{flex:1;min-width:0}.exam-date-row button{margin-top:22px;flex-shrink:0}