:root{--bg: #f4f6fb;--surface: #ffffff;--surface-2: #eef2fb;--text: #172033;--text-muted: #5b6478;--border: #dbe1ee;--primary: #2457d6;--primary-strong: #1a43ad;--primary-soft: #e4ecff;--on-primary: #ffffff;--accent: #ffc43d;--danger: #c23434;--danger-soft: #fdecec;--ok: #1d9a5b;--warn: #a15c00;--warn-soft: #fff4dc;--radius: 14px;--tap: 44px;--shadow: 0 1px 2px rgb(16 24 40 / 6%), 0 2px 8px rgb(16 24 40 / 5%);color-scheme:light dark;font-family:system-ui,-apple-system,Segoe UI,Roboto,Apple SD Gothic Neo,Noto Sans KR,Hiragino Sans,Noto Sans JP,Malgun Gothic,sans-serif;line-height:1.5;color:var(--text);background:var(--bg);-webkit-text-size-adjust:100%}@media(prefers-color-scheme:dark){:root{--bg: #0f1420;--surface: #182032;--surface-2: #1f2a40;--text: #e8ecf5;--text-muted: #9aa4ba;--border: #2c3850;--primary: #6d95ff;--primary-strong: #93b0ff;--primary-soft: #23345c;--on-primary: #0b1226;--danger: #ff8a8a;--danger-soft: #3a1f25;--ok: #4cd08b;--warn: #ffc261;--warn-soft: #3a2f17;--shadow: none}}*,*:before,*:after{box-sizing:border-box}html,body{margin:0;overflow-x:hidden}body{background:var(--bg);min-height:100dvh}button{font:inherit;color:inherit;-webkit-tap-highlight-color:transparent;touch-action:manipulation}button:focus-visible{outline:3px solid var(--primary);outline-offset:2px}h1,h2,p{margin:0}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}.app{max-width:1120px;margin:0 auto;padding:0 16px calc(24px + env(safe-area-inset-bottom))}.app-header{display:flex;align-items:center;gap:10px;padding:calc(14px + env(safe-area-inset-top)) 0 12px}.app-header h1{font-size:1.2rem;font-weight:700}.app-main{display:grid;gap:12px;min-width:0}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px;min-width:0}.notice{text-align:center;color:var(--text-muted)}.notice.is-error{color:var(--danger)}.field{display:grid;gap:6px;min-width:0}.field-label{font-size:.8rem;font-weight:600;color:var(--text-muted);letter-spacing:.02em}.segmented{display:flex;gap:4px;padding:4px;background:var(--surface-2);border-radius:12px;min-width:0}.segment{flex:1 1 0;min-width:0;min-height:var(--tap);padding:6px 4px;border:0;border-radius:9px;background:transparent;font-size:.92rem;font-weight:600;color:var(--text-muted);cursor:pointer;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.segment.is-selected{background:var(--surface);color:var(--primary);box-shadow:0 1px 3px #10182826}.segment:disabled{opacity:.35;cursor:not-allowed}.chip{display:inline-flex;align-items:center;gap:6px;min-height:var(--tap);padding:6px 14px;border:1px solid var(--border);border-radius:999px;background:var(--surface);font-weight:600;cursor:pointer}.chip.is-selected{background:var(--primary-soft);border-color:var(--primary);color:var(--primary-strong)}.language-picker{display:grid;grid-template-columns:minmax(0,1fr);gap:8px}.swap-button{justify-self:center;width:var(--tap);height:36px;transform:rotate(90deg)}@media(min-width:760px){.language-picker{grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:end}.swap-button{transform:none;height:var(--tap);margin-bottom:4px}}.topic-picker{display:grid;gap:10px}.topic-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}@media(min-width:560px){.topic-list{grid-template-columns:repeat(4,minmax(0,1fr))}}.topic{display:grid;grid-template-columns:auto minmax(0,1fr);grid-template-areas:"icon name" "icon soon";align-items:center;column-gap:8px;min-height:56px;padding:8px 12px;border:1px solid var(--border);border-radius:12px;background:var(--surface);text-align:left;cursor:pointer}.topic.is-selected{border-color:var(--primary);background:var(--primary-soft)}.topic:disabled{cursor:default;opacity:.55}.topic-icon{grid-area:icon;font-size:1.4rem}.topic-name{grid-area:name;font-weight:700;font-size:.95rem;overflow-wrap:anywhere}.topic-soon{grid-area:soon;font-size:.75rem;color:var(--text-muted)}.lesson-list{display:flex;flex-wrap:wrap;gap:6px}.lesson-heading{padding:4px 2px 0}.lesson-heading h2{font-size:1.15rem}.lesson-heading p{color:var(--text-muted);font-size:.92rem}.player-layout{display:grid;gap:12px;min-width:0}@media(min-width:960px){.player-layout{grid-template-columns:minmax(0,3fr) minmax(0,2fr);align-items:start}.player{position:sticky;top:12px}}.player{display:grid;gap:14px}.sentence-card{display:grid;gap:8px;min-height:170px;align-content:center;padding:16px;border-radius:12px;background:var(--surface-2);border:2px solid transparent;transition:border-color .2s}.sentence-card.is-active{border-color:var(--primary)}.sentence-meta{display:flex;align-items:center;gap:8px;font-size:.85rem;color:var(--text-muted)}.sentence-number{font-weight:700;font-variant-numeric:tabular-nums}.speaker{display:inline-grid;place-items:center;min-width:24px;height:24px;padding:0 6px;border-radius:999px;background:var(--accent);color:#3a2a00;font-weight:700;font-size:.75rem}.sentence-target{font-size:clamp(1.35rem,5.5vw,1.9rem);font-weight:700;line-height:1.35;overflow-wrap:anywhere}.sentence-explain{font-size:1.02rem;color:var(--text-muted);overflow-wrap:anywhere}.status-line{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;min-height:24px;font-size:.9rem;color:var(--text-muted)}.status-badge{display:inline-flex;align-items:center;gap:6px;padding:3px 10px;border-radius:999px;font-weight:700;border:1px solid var(--border);background:var(--surface);color:var(--text-muted)}.status-dot{width:10px;height:10px;border-radius:50%;background:currentColor}.status-badge.is-playing{color:var(--ok);border-color:currentColor}.status-badge.is-playing .status-dot{animation:pulse 1.2s ease-in-out infinite}.status-badge.is-paused{color:var(--warn);border-color:currentColor}.status-summary{font-weight:600}.status-warning{flex-basis:100%;padding:6px 10px;border-radius:10px;background:var(--warn-soft);color:var(--warn);font-weight:600}@keyframes pulse{50%{opacity:.35}}.status-progress{padding:1px 8px;border-radius:999px;background:var(--primary-soft);color:var(--primary-strong);font-weight:600;font-variant-numeric:tabular-nums}.status-issue{flex-basis:100%;padding:8px 10px;border-radius:10px;background:var(--danger-soft);color:var(--danger);font-weight:600}.controls{display:flex;justify-content:center;align-items:center;gap:12px}.icon-button{display:inline-grid;place-items:center;width:52px;height:52px;border:1px solid var(--border);border-radius:50%;background:var(--surface);cursor:pointer}.icon-button:disabled{opacity:.35;cursor:not-allowed}.play-button{width:72px;height:72px;border:0;background:var(--primary);color:var(--on-primary);box-shadow:0 4px 12px #2457d64d}.options{display:grid;gap:12px}.course-row{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:8px}.restart-button{margin-bottom:4px;border-radius:12px}.sentence-list ol{list-style:none;margin:8px 0 0;padding:0;display:grid;gap:4px}.sentence-item{display:grid;grid-template-columns:28px minmax(0,1fr) auto;gap:8px;align-items:start;width:100%;min-height:var(--tap);padding:8px 10px;border:1px solid transparent;border-radius:10px;background:transparent;text-align:left;cursor:pointer}.sentence-item.is-current{background:var(--primary-soft);border-color:var(--primary)}.sentence-item-number{font-weight:700;color:var(--text-muted);font-variant-numeric:tabular-nums}.sentence-item-text{display:grid;min-width:0;overflow-wrap:anywhere}.sentence-item-text small{color:var(--text-muted);font-size:.82rem}.no-audio{color:var(--danger);font-weight:700}.app-footer{display:grid;gap:4px;margin-top:20px;padding:12px 2px 0;border-top:1px solid var(--border);font-size:.78rem;color:var(--text-muted)}.build-info{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;overflow-wrap:anywhere}