:root{--fg: #1f2328;--muted: #6b7280;--line: #e5e7eb;--accent: #2563eb;--bg: #f7f8fa}*{box-sizing:border-box}body{margin:0;font-family:system-ui,Hiragino Kaku Gothic ProN,Yu Gothic,Meiryo,sans-serif;color:var(--fg);background:var(--bg);line-height:1.6}.app{max-width:760px;margin:0 auto;padding:0 16px 48px}.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 0;border-bottom:1px solid var(--line);margin-bottom:24px}.topbar nav{display:flex;align-items:center;gap:14px}.brand{font-weight:700;font-size:18px;text-decoration:none;color:var(--fg)}a{color:var(--accent)}.muted{color:#6b7280}.small{font-size:13px}.center{text-align:center;padding:60px 0}h1{font-size:24px;margin:8px 0 12px}h2{font-size:18px;margin:0 0 6px}.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px;margin-bottom:16px}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px;margin:16px 0}.tile{display:block;background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px;text-decoration:none;color:var(--fg);transition:border-color .15s,transform .05s}.tile:hover{border-color:var(--accent)}.tile p{margin:0;color:#6b7280;font-size:14px}.btn{display:inline-block;background:var(--accent);color:#fff;border:none;border-radius:8px;padding:10px 18px;font-size:15px;cursor:pointer;text-decoration:none}.btn:disabled{opacity:.5;cursor:default}.btn.secondary{background:#fff;color:var(--fg);border:1px solid var(--line)}.row{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}.linklike{background:none;border:none;color:var(--accent);cursor:pointer;font-size:15px}.session{text-align:center;padding:32px 20px}.session-meta{margin-bottom:20px}.badge-new{background:#fef3c7;color:#92400e;border-radius:6px;padding:1px 8px;margin-left:8px;font-size:12px}.word{font-size:40px;font-weight:700;margin:16px 0 4px}.pos{font-style:italic;margin-bottom:24px}.reveal{margin-top:12px}.answer .meaning{font-size:20px;margin:8px 0}.answer .example{color:#374151;margin-bottom:4px}.answer .example-ja{margin-bottom:20px;font-size:14px}.ratings{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}.btn.again{background:#ef4444}.btn.hard{background:#f59e0b}.btn.good{background:#10b981}.btn.easy{background:#3b82f6}.progress-label{margin-bottom:8px;font-weight:600}.bar{background:#eef0f3;border-radius:999px;height:14px;overflow:hidden}.bar-fill{background:var(--accent);height:100%;transition:width .3s}.stats .stat{text-align:center}.stat .num{font-size:28px;font-weight:700}.msg{margin-top:12px;padding:10px 12px;background:#f0f9ff;border:1px solid #bae6fd;border-radius:8px;font-size:14px}.article-list{display:flex;flex-direction:column;gap:10px;margin:14px 0}.article-item{display:block}.article-title{font-weight:600}.read-badge{background:#dcfce7;color:#166534;border-radius:6px;padding:1px 8px;margin-left:8px;font-size:12px}.reading-body{font-size:18px;line-height:1.9}.reading-body.small{font-size:14px;line-height:1.7;white-space:pre-wrap}mark.hl{background:#fff3bf;border-bottom:2px solid #f59e0b;padding:0 1px;cursor:help}.quiz-q{margin:16px 0}.quiz-question{font-weight:600;margin-bottom:6px}.quiz-choice{display:block;padding:6px 0;cursor:pointer}.quiz-choice input{margin-right:8px}.select{padding:9px 12px;border:1px solid var(--line);border-radius:8px;font-size:15px;background:#fff}.google-btn{background:#fff;color:#1f2328;border:1px solid #747775;font-weight:600}.google-btn:hover{background:#f8f9fa}.pending-item{border-top:1px solid var(--line);padding:14px 0}.pending-item:first-of-type{border-top:none}.spark{display:flex;align-items:flex-end;gap:4px;height:120px;padding-top:8px}.spark-bar{flex:1;min-width:6px;background:var(--accent);border-radius:3px 3px 0 0}code{background:#f3f4f6;padding:1px 5px;border-radius:4px;font-size:13px}.streak-banner{background:#fff7ed;border:1px solid #fed7aa;color:#9a3412;border-radius:10px;padding:12px 16px;margin:8px 0 16px;font-weight:600}.streak-hero{text-align:center;padding:28px 20px}.streak-num{font-size:48px;font-weight:800;color:#ea580c}.badge-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:12px;margin-top:12px}.badge{text-align:center;padding:14px 8px;border:1px solid var(--line);border-radius:10px}.badge.on{background:#fffbeb;border-color:#fde68a}.badge.off{opacity:.5}.badge-icon{font-size:28px}.badge-label{font-size:13px;margin-top:4px}footer{margin-top:32px;padding-top:16px;border-top:1px solid var(--line)}