:root{color-scheme:light dark;--paper:#f6f8fa;--card:#fff;--ink:#193344;--muted:#506778;--line:#d8e2e8;--accent:#176858;--soft:#eaf4f0}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.8 system-ui,-apple-system,"Segoe UI",sans-serif;overflow-wrap:anywhere}a{color:var(--accent);text-underline-offset:4px}a:hover{text-decoration-thickness:2px}a:focus-visible,summary:focus-visible{outline:3px solid #8d70d0;outline-offset:5px}h1,h2,h3,h4{line-height:1.35;letter-spacing:-.025em}h1{font-size:clamp(2.1rem,5.5vw,3.6rem);margin:12px 0 18px}h2{font-size:1.65rem}h3{font-size:1.15rem}h4{font-size:1.02rem}p{margin:12px 0 20px}header nav,footer{max-width:1120px;margin:auto;padding:23px 32px}header nav{display:flex;justify-content:space-between;align-items:center;gap:16px}header nav>div{display:flex;flex-wrap:wrap;gap:12px 24px}header nav a{min-height:44px;display:inline-flex;align-items:center;text-decoration:none;font-size:.88rem}#pv-header{background:var(--card);border-bottom:1px solid var(--line)}.brand{display:flex;flex-direction:column;align-items:flex-start;font-weight:800;font-size:1.15rem;line-height:1.35}.brand span{font-size:.58rem;letter-spacing:.15em;color:var(--muted);margin-top:5px}main{max-width:1000px;padding:22px 32px 60px;margin:auto}.hero{padding:35px 0 46px;max-width:830px}.eyebrow{font-size:.7rem;font-weight:750;letter-spacing:.13em;color:var(--accent)}.english-title{font:1.65rem/1.5 Georgia,serif}.muted{color:var(--muted);font-size:.87rem}.button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:12px 22px;background:var(--accent);color:#fff;border-radius:9px;text-decoration:none;font-size:.9rem;font-weight:700;margin:12px 0;line-height:1.5}.reading-plan,.writing{background:var(--soft);border:1px solid var(--line);border-radius:18px;padding:28px 32px;margin:0 0 42px}.reading-plan h2,.writing h2{margin-top:0}.reading-plan li{margin:10px 0}.reading-plan ol{padding-left:22px}.passage{margin:42px 0;padding:0 0 36px;border-bottom:1px solid var(--line)}.passage h2{font:1.7rem/1.55 Georgia,serif}.meaning{font-size:1.1rem;color:var(--accent);font-weight:600}.chunks{list-style:none;padding:0;display:flex;flex-wrap:wrap;gap:10px}.chunks li{display:flex;flex-direction:column;flex:1 1 150px;border:1px solid var(--line);background:var(--card);padding:14px 18px;border-radius:10px}.chunks span{font-size:.9rem}.chunks small{color:var(--muted);font-size:.7rem}.grammar{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:0 23px 8px;margin:16px 0}.example{border-left:3px solid var(--accent);padding-left:16px;font-family:Georgia,serif;font-size:1.17rem}.tip{color:var(--muted);font-size:.9rem}.self-check{border:1px solid var(--line);padding:18px 22px;border-radius:12px;background:var(--soft)}summary{cursor:pointer;font-weight:700;min-height:44px}summary span{display:block;font-size:.72rem;font-weight:400;color:var(--muted)}.source{border-top:1px solid var(--line);padding-top:20px;font-size:.88rem}.source dl{display:grid;grid-template-columns:140px minmax(0,1fr);gap:12px 20px}.source dt{font-weight:700}.source dd{margin:0}.guide-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin:25px 0 44px}.guide-card{display:flex;flex-direction:column;align-items:flex-start;background:var(--card);border:1px solid var(--line);border-radius:15px;padding:25px;color:var(--ink);text-decoration:none}.guide-card:hover{border-color:var(--accent)}.guide-card h3{font-size:1.18rem;margin:12px 0}.guide-card p{font-size:.84rem;color:var(--muted)}.guide-card p[lang=en]{font:1.25rem Georgia,serif;color:var(--ink);margin:3px 0 15px}.card-end{margin-top:auto;font-size:.75rem;font-weight:700;color:var(--accent)}.next{display:flex;flex-wrap:wrap;gap:12px 28px;margin-top:40px}.next h2{width:100%;font-size:1.2rem}.breadcrumb{display:flex;gap:12px;font-size:.78rem;color:var(--muted)}footer{font-size:.78rem;color:var(--muted);border-top:1px solid var(--line)}footer nav{display:flex;flex-wrap:wrap;gap:6px 22px}footer a{display:inline-flex;align-items:center;min-height:44px}.skip{position:absolute;top:-100px;left:20px;background:var(--card);padding:10px;z-index:5}.skip:focus{top:10px}
@media(max-width:620px){body{font-size:16px}header nav{padding:14px 20px;align-items:flex-start}header nav>div{gap:4px 13px;justify-content:flex-end}header nav a{font-size:.75rem}.brand{font-size:1rem}main{padding:18px 20px 45px}.hero{padding:20px 0 30px}.guide-grid{grid-template-columns:minmax(0,1fr)}.reading-plan,.writing{padding:21px}.source dl{grid-template-columns:minmax(0,1fr);gap:4px}.source dd{margin-bottom:14px}.grammar{padding:0 17px 6px}.passage h2{font-size:1.5rem}footer{padding:23px 20px}.chunks li{flex-basis:125px}}
@media(prefers-color-scheme:dark){:root{--paper:#11202b;--card:#182b37;--ink:#e5eef3;--muted:#afc1ce;--line:#344956;--accent:#85d9bd;--soft:#1c3536}.button{color:#102820}}