:root{--green-dark: #1B4332;--green-mid: #2D6A4F;--gold: #C9A227;--page-bg: #EBE7E0;--card-bg: #FFFFFF;--tag-bg: #D1FAE5;--tag-text: #065F46;--amber-bg: #FEF3C7;--amber-border: #F59E0B;--amber-text: #92400E;--error-bg: #FEE2E2;--error-text: #991B1B;--text-primary: #111827;--text-muted: #6B7280;--border: #E5E7EB;--radius-sm: 6px;--radius: 10px;--radius-lg: 14px;--shadow: 0 4px 32px rgba(0, 0, 0, .1)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:Noto Sans JP,sans-serif;font-size:14px;line-height:1.6;color:var(--text-primary);background:var(--page-bg)}.page-bg{min-height:100dvh;padding:40px 24px 64px;display:flex;justify-content:center;align-items:flex-start}.card{width:100%;max-width:1100px;background:var(--card-bg);border-radius:var(--radius-lg);box-shadow:var(--shadow);overflow:hidden}.error-screen{padding:40px;color:var(--error-text);font-weight:500}.header{background:var(--green-dark);border-bottom:3px solid var(--gold);padding:16px 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14px;border-radius:var(--radius);font-size:14px;line-height:1.6;word-break:break-word}.chat-balloon.user{background:var(--green-dark);color:#fff;border-bottom-right-radius:2px}.chat-balloon.ai-answer{background:#fff;border:1px solid var(--border);border-bottom-left-radius:2px;box-shadow:0 1px 4px #0000000f}.ai-answer-text{margin-bottom:6px}.ai-source{font-size:11px;color:var(--text-muted);background:#f3f4f6;display:inline-block;padding:2px 8px;border-radius:4px}.chat-balloon.out-of-scope{background:var(--amber-bg);border:1px solid var(--amber-border);color:var(--amber-text);border-bottom-left-radius:2px}.out-of-scope-title{font-weight:700;margin-bottom:4px}.chat-balloon.blocked{background:#f3f4f6;color:var(--text-muted);border-bottom-left-radius:2px}.chat-balloon.error{background:var(--error-bg);color:var(--error-text);border-bottom-left-radius:2px}.chat-balloon.loading{display:flex;gap:4px;align-items:center;padding:12px 16px}.chat-balloon.loading 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#0000000d}.qa-card-question{font-size:14px;font-weight:600;color:var(--text-primary);display:flex;gap:6px}.qa-q-label{color:var(--green-dark);font-weight:700;flex-shrink:0}.qa-card-answer{font-size:13px;color:var(--text-muted);display:flex;flex-wrap:wrap;gap:4px 6px;align-items:baseline}.qa-a-label{color:var(--gold);font-weight:700;flex-shrink:0}.qa-answer-muted{color:var(--text-muted)}.qa-badge-oos{display:inline-block;background:var(--amber-bg);color:var(--amber-text);font-size:11px;font-weight:600;padding:2px 8px;border-radius:4px;border:1px solid var(--amber-border)}.footer{display:flex;align-items:center;justify-content:space-between;padding:16px 28px;border-top:1px solid var(--border);background:var(--card-bg)}.footer-channel{font-size:13px;font-weight:600;color:var(--green-dark)}.footer-credit{font-size:12px;color:var(--text-muted)}@media (max-width: 768px){.page-bg{padding:16px 12px 40px}.main-grid{grid-template-columns:1fr;grid-template-rows:auto minmax(320px,55vh);height:auto}.video-area{border-right:none;border-bottom:1px solid var(--border);overflow-y:visible}.qa-grid{grid-template-columns:1fr}.list-main{padding:20px 16px}.back-link-row{padding:12px 16px 0}}.list-main{padding:28px}.list-intro{margin-bottom:20px}.list-heading{font-size:20px;font-weight:700;color:var(--green-dark)}.list-lead{color:var(--text-muted);margin-top:4px}.category-chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px}.category-chip{border:1px solid var(--border);background:var(--card-bg);color:var(--text-primary);border-radius:999px;padding:6px 14px;font-size:13px;cursor:pointer;transition:background .15s,color .15s}.category-chip:hover{background:var(--tag-bg)}.category-chip-active{background:var(--green-mid);border-color:var(--green-mid);color:#fff}.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}.video-card{display:flex;flex-direction:column;border:1px solid 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0}.back-link{color:var(--green-mid);font-size:13px;text-decoration:none}.back-link:hover{text-decoration:underline}.suggest-chips{display:flex;flex-direction:column;align-items:flex-start;gap:6px;margin-top:10px}.suggest-chip{border:1px solid var(--amber-border);background:var(--card-bg);color:var(--amber-text);border-radius:999px;padding:6px 12px;font-size:12px;text-align:left;cursor:pointer;transition:background .15s}.suggest-chip:hover{background:var(--amber-bg)}