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0 auto;margin-left:auto;width:30px;height:30px;border:none;border-radius:var(--db-radius-sm);background:transparent;color:var(--text-muted);transition:opacity var(--db-transition),color var(--db-transition),background-color var(--db-transition)}.db-set-delete:hover{color:var(--danger);background:var(--danger-wash)}.db-set-delete.confirming{color:#fff;background:var(--danger)}@media(hover:hover){.db-set-delete{opacity:0}.db-set:hover .db-set-delete,.db-set-delete:focus-visible,.db-set-delete.confirming{opacity:1}}.db-selection-warn{margin-left:10px;color:var(--danger);font-size:12px;font-style:normal;font-weight:600}.db-set-solution{min-width:0;margin-top:18px;border-top:1px solid var(--line);padding-top:12px;font-size:14px;line-height:1.8}.db-set-solution .katex-display{max-width:100%;overflow-x:auto;overflow-y:hidden}.db-set-solution summary{cursor:pointer;text-decoration:underline;text-underline-offset:3px}.db-set-solution[open] summary{margin-bottom:14px}.practice-page{min-height:100dvh;display:flex;flex-direction:column;background:var(--ui-bg);color:var(--ui-ink);font-family:var(--ui-font-sans);font-size:var(--ui-body-size, 1rem);-webkit-font-smoothing:antialiased}.practice-page :focus-visible{outline:none;box-shadow:none}.practice-page h1:focus,.practice-page h2:focus{outline:none}.practice-header{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px 20px;position:sticky;top:12px;z-index:20;width:min(100% - 48px,1120px);min-height:68px;margin:18px auto 0;padding:10px 16px}.practice-header nav{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.practice-header-action{min-height:44px;padding:10px 12px;gap:6px;font-size:var(--ui-subheadline-size, .9375rem);font-weight:600}.practice-main{flex:1;width:min(100% - 48px,760px);margin:0 auto;padding:32px 0 40px}.practice-sheet{padding:32px 40px;border:1px solid var(--ui-line);border-radius:var(--ui-panel-radius);background:var(--ui-surface);box-shadow:var(--ui-panel-shadow)}.practice-sheet h1,.practice-sheet h2{margin:0 0 22px;font-weight:600;letter-spacing:normal;line-height:1.5}.practice-sheet h1{font-size:var(--ui-title-size, 1.75rem)}.practice-sheet h2{font-size:var(--ui-title2-size, 1.375rem)}.practice-prose{font-family:var(--ui-font-sans);font-size:var(--ui-body-size, 1rem);line-height:1.9;overflow-wrap:anywhere}.practice-prose .katex{font-size:1.06em}.practice-prose .katex-display{margin:.8em 0;max-width:100%;overflow-x:auto;overflow-y:hidden;padding-block:2px}.practice-prose br:has(+.katex-display),.practice-prose .katex-display+br{display:none}.practice-record{width:min(100%,540px);margin:12px auto;padding:32px;border:1px solid var(--ui-line);border-radius:var(--ui-panel-radius);background:var(--ui-surface);box-shadow:var(--ui-panel-shadow)}.practice-record h1{margin:0 0 28px;font-size:var(--ui-title-size, 1.75rem);font-weight:600;letter-spacing:normal;line-height:1.4}.practice-totals{margin:0}.practice-totals>div{display:flex;justify-content:space-between;align-items:baseline;flex-wrap:wrap;gap:8px 20px;padding:20px 0;border-bottom:1px solid var(--ui-line-soft)}.practice-totals>div:last-child{border-bottom:0;padding-bottom:0}.practice-totals dt{color:var(--ui-muted);font-size:var(--ui-body-size, 1rem);line-height:1.6}.practice-totals dd{margin:0 0 0 auto;font-size:var(--ui-body-size, 1rem);font-weight:600;line-height:1.6;font-variant-numeric:tabular-nums}.practice-controls{position:sticky;bottom:0;z-index:10;padding:16px 24px calc(16px + env(safe-area-inset-bottom));border-top:1px solid var(--ui-line);background:var(--ui-glass);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px)}.practice-page--flow-controls .practice-header{position:static}.practice-page--flow-controls .practice-controls{position:relative}.practice-control-inner{max-width:680px;margin:0 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var(--ui-line);border-radius:var(--ui-panel-radius);background:var(--ui-surface)}.practice-load-state>p{margin:0;font-size:var(--ui-body-size, 1rem);line-height:1.8}.practice-load-state .practice-error{padding:0;border:0;margin-bottom:20px}.practice-page--exercise{--practice-content-width: 640px;overflow-anchor:none}.practice-page--exercise .practice-header,.practice-page--exercise .practice-main,.practice-page--exercise .practice-controls{width:min(calc(100% - 32px),var(--practice-content-width));margin-inline:auto}.practice-page--exercise .practice-header{display:flex;justify-content:space-between;align-items:center;flex-wrap:nowrap;gap:20px;min-height:64px;margin-top:0;padding:10px 0;top:0;border:0;border-radius:0;background:var(--ui-bg);box-shadow:none;backdrop-filter:none;-webkit-backdrop-filter:none}.practice-page--exercise .practice-header-action{min-height:44px;padding:8px 10px;gap:6px;border:0;background:transparent;font-size:var(--ui-subheadline-size, .9375rem)}.practice-page--exercise .practice-header-action:hover,.practice-page--exercise .practice-header-action:focus-visible{background:var(--ui-accent-soft)}.practice-header-end{width:min(48%,280px);min-width:0}.practice-route{display:flex;align-items:center;gap:14px;height:32px}.practice-route-track{position:relative;flex:1;height:6px;border-radius:3px;background:var(--ui-line-soft)}.practice-route-fill{position:absolute;inset:0 auto 0 0;border-radius:inherit;background:linear-gradient(90deg,var(--ui-accent),var(--ui-violet))}.practice-route-stop{position:absolute;top:50%;width:10px;height:10px;transform:translate(-50%,-50%);border:2px solid var(--ui-line-strong);border-radius:50%;background:var(--ui-bg)}.practice-route-stop--done{border-color:var(--ui-accent);background:var(--ui-accent)}.practice-route-position{position:absolute;top:50%;width:14px;height:14px;margin-top:-7px;margin-left:-7px;border:3px solid var(--ui-bg);border-radius:50%;background:var(--ui-accent);box-shadow:0 0 12px var(--ui-accent-soft)}.practice-route-goal{flex:none;width:20px;height:20px;stroke-width:var(--ui-icon-stroke);color:var(--ui-muted);transition:color .2s ease}.practice-route-goal--done{color:var(--ui-accent);fill:var(--ui-accent-soft)}.practice-feedback{position:absolute;left:0;right:0;bottom:calc(100% + 16px);color:var(--ui-text-soft);font-size:var(--ui-title2-size, 1.375rem);font-weight:700;text-align:center;pointer-events:none}.practice-feedback--solved{color:var(--ui-accent)}.practice-page--exercise .practice-main{padding-top:12px}.practice-page--exercise .practice-sheet{padding:28px 32px}.practice-page--exercise .practice-controls{padding-inline:0;border-top:0;background:var(--ui-bg);backdrop-filter:none;-webkit-backdrop-filter:none}.practice-page--exercise .practice-control-inner{max-width:none}@media(max-width:860px){.practice-header{width:100%;margin:0;padding:10px 20px;top:0}}@media(max-width:600px){.practice-header .ui-brand{margin-block:4px}.practice-main{width:calc(100% - 32px);padding:24px 0 32px}.practice-sheet,.practice-page--exercise .practice-sheet{padding:24px 22px}.practice-record{padding:26px 22px;margin-top:4px}.practice-controls{padding:14px 16px calc(14px + env(safe-area-inset-bottom))}.practice-actions{gap:10px}.practice-load-state{margin-block:24px;padding:24px}}@media(prefers-reduced-motion:reduce){.practice-route-goal{transition:none}}@media(prefers-reduced-transparency:reduce){.practice-controls{backdrop-filter:none;-webkit-backdrop-filter:none}}.practice-courses-page{background:var(--ui-bg)}.practice-courses-page .practice-courses-header{top:0;width:100%;min-height:68px;margin:0;padding:0;border-width:0 0 1px;border-radius:0;background:var(--ui-glass);box-shadow:none}.practice-courses-header-inner,.practice-courses-container{width:min(100% - 48px,1120px);margin:0 auto}.practice-courses-header-inner{display:flex;flex-wrap:wrap;align-items:center;gap:12px 24px;min-height:68px;padding-block:10px}.practice-course-track-control{flex:none;margin-left:auto}.practice-course-track-control .ui-select-trigger{min-width:100px}.practice-courses-main{width:100%;margin:0;padding:0 0 64px}.practice-courses-content{padding-top:32px}.practice-courses-title{margin:0 0 32px;font-size:var(--ui-title-size, 1.75rem);font-weight:600;letter-spacing:normal;line-height:1.4}.practice-course-group+.practice-course-group{margin-top:40px}.practice-course-group>h2,.practice-course-group>h3{margin:0 0 18px;font-weight:600;line-height:1.5;letter-spacing:normal}.practice-course-group>h2{font-size:var(--ui-title2-size, 1.375rem)}.practice-course-group>h3{font-size:var(--ui-title3-size, 1.25rem)}.practice-universities{margin-top:40px;padding-top:30px;border-top:1px solid var(--ui-line)}.practice-universities>h2{margin:0 0 26px;font-size:var(--ui-title2-size, 1.375rem);font-weight:600;line-height:1.5;letter-spacing:normal}.practice-foundation-entry{display:flex;align-items:center;gap:16px;width:min(100%,520px);min-height:76px;padding:20px 24px;border:1px solid var(--ui-line);border-radius:16px;background:var(--ui-surface);color:var(--ui-ink);font-size:var(--ui-body-size, 1rem);font-weight:600;line-height:1.6;text-decoration:none;transition:background-color .16s ease,border-color .16s ease}.practice-foundation-entry>.ui-icon:first-child{width:28px;height:28px;color:var(--ui-accent)}.practice-foundation-entry>.ui-icon:last-child{margin-left:auto;color:var(--ui-accent)}.practice-foundation-entry:focus-visible{border-color:var(--ui-focus);background:var(--ui-accent-soft)}.practice-course-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,16rem),1fr));gap:22px;margin:0;padding:0;list-style:none}.practice-course-group:has(>#practice-group-tokyo-kyoto) .practice-course-list{grid-template-columns:repeat(auto-fit,minmax(min(100%,16rem),1fr))}.practice-course-list>li{min-width:0}.practice-course-link{display:flex;flex-direction:column;height:100%;overflow:hidden;border:1px solid var(--ui-line);border-radius:var(--ui-panel-radius);background:var(--ui-surface);color:var(--ui-ink);text-decoration:none;box-shadow:var(--ui-panel-shadow);transition:border-color .16s ease}.practice-course-cover{position:relative;aspect-ratio:16 / 10;overflow:hidden;background:var(--ui-subtle)}.practice-course-name{margin:0;color:var(--ui-ink);font-family:var(--ui-font-sans);font-size:var(--ui-title3-size, 1.25rem);font-weight:600;letter-spacing:normal;line-height:1.5;overflow-wrap:anywhere}.practice-course-art{display:block;width:100%;height:100%;object-fit:cover;object-position:center 40%}.practice-course-art[src$="/meiji.webp"],.practice-course-art[src$="/aoyama-gakuin.webp"]{object-position:center top}.practice-course-copy{display:flex;flex-direction:column;flex:1;gap:20px;padding:22px 24px}.practice-course-heading{display:flex;align-items:baseline;flex-wrap:wrap;gap:8px 16px}.practice-course-heading>.practice-course-name{min-width:0;flex:1 1 100%}.practice-course-track{color:var(--ui-muted);font-family:var(--ui-font-sans);font-size:var(--ui-subheadline-size, .9375rem);line-height:1.5}.practice-course-action{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:auto;padding-top:14px;border-top:1px solid var(--ui-line-soft);color:var(--ui-text-soft);font-size:var(--ui-body-size, 1rem);font-weight:600;line-height:1.6}.practice-course-action .ui-icon{width:18px;height:18px;color:var(--ui-accent)}.practice-course-link:focus-visible{border-color:var(--ui-focus)}.practice-course-profile{max-width:900px}.practice-course-profile>.practice-course-heading{margin-bottom:24px}.practice-course-profile .practice-course-name{font-size:var(--ui-title2-size, 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