:root{--ink:#234b49;--paper:#faf9f3;--muted:#5a6f69;--line:#d6dfd6;--mint:#e4eee3}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--paper);color:var(--ink);font-family:system-ui,-apple-system,'Apple SD Gothic Neo','Malgun Gothic',sans-serif;line-height:1.7}header,main{max-width:1040px;margin:auto;padding:26px}header{display:flex;justify-content:space-between;gap:15px;border-bottom:1px solid var(--line);font-size:14px}a{color:inherit;text-underline-offset:4px}header a{text-decoration:none;font-weight:700}header span{color:var(--muted)}main{padding-bottom:190px}.hero{padding:55px 0 42px}.eyebrow{font-size:13px;color:#975c37;letter-spacing:.08em}h1{font-size:clamp(32px,6vw,54px);letter-spacing:-.055em;line-height:1.3;margin:16px 0}h2{font-size:25px;letter-spacing:-.025em}.intro{font-size:20px;color:var(--muted)}.facts{display:flex;flex-wrap:wrap;gap:9px;margin:25px 0}.facts span{padding:6px 13px;background:var(--mint);border-radius:25px;font-size:13px}.help{font-size:14px;color:var(--muted);max-width:690px}#lessons{border-top:1px solid var(--line);padding-top:24px}label{font-size:14px}input{display:block;width:100%;font:inherit;padding:14px 17px;margin:9px 0 16px;border:1px solid #adbdaf;border-radius:8px;background:white;color:var(--ink)}.filters{display:flex;flex-wrap:wrap;gap:8px}button{font:inherit;cursor:pointer;color:var(--ink)}.filters button{border:1px solid #bfccbf;border-radius:22px;padding:9px 14px;background:transparent;font-size:13px}.filters button[aria-pressed=true]{background:var(--ink);color:white}#count{font-size:14px;color:var(--muted);margin:20px 0}#cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;align-items:start}.lesson{background:#fffef9;border:1px solid var(--line);border-radius:12px;overflow:hidden}.lesson>summary{padding:22px;cursor:pointer;list-style:none;position:relative}.lesson>summary::-webkit-details-marker{display:none}.lesson>summary:after{content:'＋';position:absolute;right:18px;top:20px}.lesson[open]>summary:after{content:'−'}.number{font-size:12px;letter-spacing:.09em;color:var(--muted)}.lesson h3{font-size:18px;line-height:1.6;margin:7px 20px 4px 0;overflow-wrap:anywhere}.open-hint{font-size:12px;color:var(--muted)}.lesson[open] .open-hint{display:none}.lesson-body{padding:0 20px 18px}.track-actions{display:flex;gap:8px;flex-wrap:wrap;padding:3px 0 14px}.track-actions button{border:0;border-radius:6px;background:var(--ink);color:white;font-size:13px;padding:11px 13px}.track-downloads{font-size:12px;margin:0 0 20px;display:flex;gap:12px;flex-wrap:wrap}.section-name{font-size:13px;padding-top:15px;border-top:1px solid var(--line);color:var(--muted);font-weight:700}.row{display:flex;border-bottom:1px solid #e6eae1;align-items:stretch}.sentence{border:0;background:none;text-align:left;padding:14px 4px;display:flex;gap:12px;width:100%;min-width:0;border-radius:7px}.sentence:hover,.sentence.playing{background:var(--mint)}.play-icon{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:30px;height:30px;background:var(--ink);color:white;border-radius:50%;font-size:11px;margin-top:3px}.copy{min-width:0}.role{display:block;font-size:11px;color:var(--muted)}.en{font-size:16px;line-height:1.65;display:block;overflow-wrap:anywhere}.ko{display:block;font-size:13px;color:var(--muted);margin-top:5px;overflow-wrap:anywhere}.single-download{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:38px;text-decoration:none;font-size:19px}.downloads,footer{border-top:1px solid var(--line);margin-top:42px;padding-top:24px}.downloads p,footer p{color:var(--muted);font-size:14px}.download-links{display:flex;gap:10px;flex-wrap:wrap}.download-links a{background:white;border:1px solid var(--line);border-radius:7px;padding:10px 13px;text-decoration:none;font-size:13px}footer{font-size:14px}.player-bar{position:fixed;bottom:0;left:0;right:0;padding:12px max(20px,calc((100% - 988px)/2));padding-bottom:max(12px,env(safe-area-inset-bottom));background:#fffef9f5;border-top:1px solid #bac9bc;box-shadow:0 -5px 25px #234b490c;z-index:10}.player-top{display:flex;gap:15px;align-items:center;justify-content:space-between}.player-top p{font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin:0 0 6px;min-width:0}.player-top label{white-space:nowrap;font-size:12px}select{padding:5px;border:1px solid var(--line);border-radius:5px;color:var(--ink);background:white}audio{width:100%;height:40px}#error{color:#953f24;font-size:13px;margin:3px 0}:focus-visible{outline:3px solid #aa6a35;outline-offset:3px}@media(max-width:680px){header,main{padding-left:20px;padding-right:20px}header span{font-size:11px}.hero{padding:30px 0}.intro{font-size:17px}h2{font-size:22px}#cards{grid-template-columns:1fr}.filters button{font-size:12px;padding:8px 11px}.lesson h3{font-size:18px}.en{font-size:17px}.lesson>summary{padding:20px}.player-bar{padding-left:14px;padding-right:14px}main{padding-bottom:185px}}