@import"https://fonts.googleapis.com/css2?family=Manrope:wght@500;600;700;800&family=Noto+Sans+JP:wght@400;500;700&display=swap";:root{--font-sans: "Avenir Next", "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;--font-display: "Avenir Next", "Noto Sans JP", "Hiragino Sans", sans-serif;--bg-top: #0e1720;--bg-mid: #14202a;--bg-bottom: #1a2430;--surface: #1d2833;--surface-raised: #23313d;--surface-soft: #202c37;--surface-softest: rgba(255, 255, 255, .03);--line: rgba(214, 229, 233, .12);--line-strong: rgba(214, 229, 233, .2);--line-soft: rgba(214, 229, 233, .09);--text-main: #f4f7f8;--text-subtle: #d4dde1;--text-muted: #9eabb4;--accent: #7daaaa;--accent-strong: #9dc4c3;--accent-deep: #5f8788;--accent-ink: #0f181b;--shadow: 0 10px 30px rgba(0, 0, 0, .16)}*{box-sizing:border-box}html,body{margin:0;min-height:100%}body{min-height:100vh;background:linear-gradient(180deg,var(--bg-top) 0%,var(--bg-mid) 48%,var(--bg-bottom) 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var(--line-soft)}.drill-filter-group{display:grid;gap:10px}.drill-filter-label{margin:0;color:var(--text-muted);font-size:.84rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase}.drill-filter-row{display:flex;flex-wrap:wrap;gap:10px}.drill-index-list{display:grid;gap:0}.drill-index-item{padding:18px 0 20px;border-bottom:1px solid var(--line-soft)}.drill-index-item:first-child{padding-top:4px}.drill-index-item:last-child{border-bottom:0;padding-bottom:0}.drill-index-item h3{margin:0 0 8px;max-width:760px;font-size:clamp(1rem,1.8vw,1.18rem);line-height:1.24}.drill-index-item p{max-width:760px;margin:0;color:var(--text-muted);font-size:.96rem;line-height:1.72}.drill-index-item__topics{margin-top:12px;margin-bottom:0}.drill-page-hero{padding:8px 0 6px;margin-bottom:24px}.drill-page-hero h1{max-width:900px;margin-bottom:0;font-size:clamp(2.2rem,5vw,3.8rem);line-height:.98}.drill-page-hero 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