:root{color-scheme:light dark;--bg:#f4f6f8;--surface:#fff;--ink:#172d35;--muted:#52656d;--line:#d4dfe1;--accent:#176b58;--soft:#e6f2ed;--warn:#904600}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:18px/1.65 system-ui,sans-serif}header,main,footer{max-width:760px;margin:auto;padding:24px}header{display:flex;justify-content:space-between;align-items:center;gap:16px;border-bottom:1px solid var(--line)}a{color:var(--accent)}.brand{text-decoration:none;font-size:23px;font-weight:800}.brand span{display:block;font-size:13px;color:var(--muted);font-weight:400}nav{display:flex;gap:18px;font-size:16px}h1{font-size:30px;line-height:1.4;margin:8px 0 22px}h2{font-size:22px}p{margin:12px 0}.muted,footer{color:var(--muted);font-size:15px}.card{padding:24px;border:1px solid var(--line);border-radius:16px;background:var(--surface);margin-bottom:20px}.row{display:flex;gap:16px;flex-wrap:wrap}.row>*{flex:1;min-width:120px}label{display:block;font-size:16px;font-weight:600;margin-bottom:16px}input,select,button{font:inherit;min-height:54px;border-radius:10px;border:1px solid var(--line)}input,select{display:block;width:100%;padding:10px 12px;background:var(--surface);color:var(--ink);margin-top:6px}button{padding:12px 18px;cursor:pointer;background:var(--surface);color:var(--ink);font-weight:650;touch-action:manipulation}button.primary{background:var(--accent);color:white;border-color:var(--accent);width:100%}button:disabled{opacity:.5;cursor:wait}button:hover{filter:brightness(.95)}:focus-visible{outline:3px solid #268fdf;outline-offset:3px}.tag{display:inline-block;font-size:14px;background:var(--soft);color:var(--accent);border-radius:6px;padding:3px 10px}.word{font-size:clamp(32px,7vw,52px);overflow-wrap:anywhere;font-weight:750;margin:36px 0}.study{text-align:center;padding:28px 24px}.meaning{font-size:24px;white-space:pre-wrap;overflow-wrap:anywhere;border-top:1px solid var(--line);padding:24px 0}.ratings{display:grid;gap:12px}.ratings button{min-height:68px;text-align:left;display:flex;justify-content:space-between;align-items:center;gap:10px}.ratings small{font-size:14px;font-weight:400}.ratings button:first-child{background:var(--soft);color:var(--accent)}.ratings button:last-child{color:var(--warn)}progress{width:100%;height:9px;accent-color:var(--accent)}summary{cursor:pointer;font-size:16px;padding:8px 0}details p{font-size:15px}.error{color:#b02b31}.wordrow{padding:18px 0;border-bottom:1px solid var(--line);overflow-wrap:anywhere}.wordrow strong{font-size:23px}.wordrow .row{align-items:center}.score{font-size:30px;font-weight:750}.metrics{text-align:center}.metrics strong{display:block;font-size:32px}dl{display:grid;grid-template-columns:1fr 1fr;font-size:15px;gap:6px}dd{margin:0;text-align:right}footer{text-align:center}#save-error{color:#b02b31}@media(max-width:480px){header,main{padding:18px}header{align-items:flex-start}.brand{font-size:20px}nav{gap:12px;font-size:14px}.card{padding:20px}.row{gap:10px}.ratings small{max-width:55%;text-align:right}h1{font-size:27px}}@media(prefers-color-scheme:dark){:root{--bg:#111c23;--surface:#192a32;--ink:#edf4f6;--muted:#adc0c8;--line:#3c515b;--accent:#77d8b6;--soft:#213f3b;--warn:#ffbc80}button.primary{background:#216f5c;border-color:#216f5c}.error,#save-error{color:#ffa7a7}}