:root{--bg: #f6f7f9;--surface: #ffffff;--border: #e2e5ea;--text: #1f2430;--muted: #6b7280;--accent: #2563eb;--correct-bg: #e8f6ec;--correct-border: #34a853;--correct-text: #1e7a36;font-family:system-ui,-apple-system,Segoe UI,Hiragino Kaku Gothic ProN,Noto Sans JP,Meiryo,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);line-height:1.7}.app-header{background:var(--surface);border-bottom:1px solid var(--border);padding:12px 20px;position:sticky;top:0;z-index:10;display:flex;align-items:center;gap:20px}.app-title{font-size:16px;font-weight:700;color:var(--text);text-decoration:none}.app-nav{display:flex;gap:6px}.app-navlink{font-size:14px;color:var(--muted);text-decoration:none;padding:4px 10px;border-radius:6px}.app-navlink:hover{background:var(--bg)}.app-navlink.active{color:var(--accent);background:var(--bg);font-weight:700}.app-main{max-width:820px;margin:0 auto;padding:24px 16px 80px}.app-main-wide{max-width:1280px}.tax-layout{display:flex;align-items:flex-start;gap:16px}.tax-sidebar{flex:0 0 320px;position:sticky;top:64px;max-height:calc(100vh - 88px);overflow:auto;background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:10px 8px}.tax-content{flex:1 1 auto;min-width:0}.tax-hint{color:var(--muted);padding:24px 4px}.tax-content-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:14px;flex-wrap:wrap}.tax-breadcrumb{font-size:15px;font-weight:700}.tax-crumb-sep{color:var(--muted);margin:0 6px;font-weight:400}.tax-content-count{font-size:13px;color:var(--muted);white-space:nowrap}.tax-tree{list-style:none;margin:0;padding:0}.tax-tree .tax-tree{padding-left:16px}.tax-row{display:flex;align-items:center;gap:2px;border-radius:6px}.tax-row-selected{background:var(--bg)}.tax-toggle{flex:none;width:22px;height:26px;border:none;background:none;color:var(--muted);font-size:11px;cursor:pointer;padding:0}.tax-toggle-leaf{cursor:default}.tax-label{flex:1 1 auto;min-width:0;display:flex;align-items:center;gap:8px;border:none;background:none;text-align:left;cursor:pointer;padding:3px 6px;font-size:14px;color:var(--text);border-radius:6px}.tax-label:hover{background:var(--bg)}.tax-row-selected .tax-label{color:var(--accent);font-weight:700}.tax-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.tax-count{flex:none;font-size:11px;color:var(--muted);background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:0 7px}.tax-row-selected .tax-count{background:#fff}.ql{list-style:none;margin:0;padding:0}.ql-item{margin-bottom:8px}.ql-row{display:flex;align-items:center;gap:10px;width:100%;text-align:left;cursor:pointer;background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:10px 12px;font:inherit;color:inherit}.ql-row:hover{border-color:var(--accent)}.ql-row-open{border-color:var(--accent);border-bottom-left-radius:0;border-bottom-right-radius:0}.ql-no{flex:none;width:28px;color:var(--muted);font-size:13px;text-align:right}.ql-id{flex:none;font-size:12px;color:var(--muted);background:var(--bg);padding:2px 8px;border-radius:4px}.ql-title{flex:1 1 auto;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.ql-ans{flex:none;font-size:12px;font-weight:700;color:var(--correct-text)}.ql-caret{flex:none;color:var(--muted);font-size:11px}.ql-detail{border:1px solid var(--accent);border-top:none;border-radius:0 0 8px 8px;padding:4px 12px 12px;background:var(--surface)}.ql-detail .question{border:none;padding:8px 0 0;margin:0}.ql-setlink{display:inline-block;margin-top:8px;font-size:13px;color:var(--accent)}.tax-toolbar{display:flex;align-items:center;gap:12px;margin-bottom:12px;padding:8px 12px;background:#fffbeb;border:1px solid #fde68a;border-radius:8px;font-size:13px}.tax-editmode{font-weight:700;color:#b45309}.tax-dirty{color:#b91c1c;font-weight:700}.tax-save{font:inherit;font-weight:700;color:#fff;background:var(--accent);border:none;border-radius:6px;padding:4px 14px;cursor:pointer}.tax-save:disabled{opacity:.5;cursor:default}.tax-toolbar-hint{color:var(--muted);margin-left:auto}.tax-row-dragover{outline:2px dashed var(--accent);outline-offset:-2px;background:#eff6ff}.ql-drag{flex:none;cursor:grab;color:var(--muted);padding:0 2px;-webkit-user-select:none;user-select:none}.ql-drag:active{cursor:grabbing}.ql-drop-before{box-shadow:inset 0 3px 0 var(--accent)}.ql-drop-after{box-shadow:inset 0 -3px 0 var(--accent)}.ql-title-edit{flex:1 1 auto;min-width:0;font:inherit;padding:2px 6px;border:1px solid var(--accent);border-radius:4px}.ql-edit{flex:none;font:inherit;background:none;border:none;cursor:pointer;color:var(--muted);padding:0 4px}.ql-edit:hover{color:var(--accent)}.ql-placements{display:flex;align-items:baseline;gap:10px;margin-top:10px;padding-top:10px;border-top:1px dashed var(--border);font-size:13px}.ql-placements-label{flex:none;color:var(--muted)}.ql-place-remove{font:inherit;background:none;border:none;color:#b91c1c;cursor:pointer;margin-left:4px;padding:0 2px}@media (max-width: 720px){.tax-layout{flex-direction:column}.tax-sidebar{flex-basis:auto;width:100%;position:static;max-height:50vh}}.situation{background:var(--surface);border:1px solid var(--border);border-left:4px solid var(--accent);border-radius:8px;padding:16px 18px;margin-bottom:20px}.situation-title{font-size:13px;color:var(--muted);margin:0 0 8px;letter-spacing:.04em}.situation-text{margin:0;white-space:pre-wrap}.question{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:18px 20px;margin-bottom:20px}.question-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}.question-seq{font-size:13px;font-weight:700;color:var(--accent)}.question-id{font-size:12px;color:var(--muted);background:var(--bg);padding:2px 8px;border-radius:4px}.question-prompt{margin:0 0 16px;white-space:pre-wrap;font-size:16px}.choices{list-style:none;margin:0 0 8px;padding:0}.choice{display:flex;align-items:flex-start;gap:10px;border:1px solid var(--border);border-radius:6px;padding:10px 12px;margin-bottom:8px}.choice-num{flex:none;width:24px;height:24px;border-radius:50%;background:var(--bg);color:var(--muted);font-size:13px;font-weight:700;display:inline-flex;align-items:center;justify-content:center}.choice-text{flex:1}.choice-correct{background:var(--correct-bg);border-color:var(--correct-border)}.choice-correct .choice-num{background:var(--correct-border);color:#fff}.choice-badge{flex:none;align-self:center;font-size:12px;font-weight:700;color:var(--correct-text);border:1px solid var(--correct-border);border-radius:4px;padding:1px 6px}.choice-fallback{font-size:13px;color:var(--muted)}.num-answer{display:flex;align-items:baseline;gap:10px;background:var(--correct-bg);border:1px solid var(--correct-border);border-radius:6px;padding:10px 14px;margin-bottom:8px}.num-answer-label{font-size:13px;font-weight:700;color:var(--correct-text)}.num-answer-value{font-size:20px;font-weight:700}.meta{margin:16px 0 0;padding-top:12px;border-top:1px dashed var(--border);display:grid;grid-template-columns:1fr;gap:6px;font-size:13px}.meta-row{display:grid;grid-template-columns:84px 1fr;gap:10px}.meta-row dt{color:var(--muted);margin:0}.meta-row dd{margin:0}.tags{display:flex;flex-wrap:wrap;gap:6px}.tag{background:var(--bg);border:1px solid var(--border);border-radius:4px;padding:1px 8px;font-size:12px}.tag-flag{background:#fff7ed;border-color:#fdba74;color:#b45309}.loading{display:flex;align-items:center;gap:12px;color:var(--muted);padding:40px 0}.spinner{width:22px;height:22px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.error,.notfound{padding:24px 0;color:var(--muted)}.error{color:#b91c1c}