:root{--ink:#263b34;--muted:#718078;--line:#dce8df;--green:#397763;--soft:#eaf5ef;--orange:#c87845;--blue:#4d7894;--blue-soft:#edf5f8;--yellow:#b58a2c}*{box-sizing:border-box}body{margin:0;background:#f6faf7;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif}.shell{max-width:1240px;margin:auto;padding:18px}.header{display:flex;align-items:center;gap:14px;border-bottom:1px solid var(--line);padding-bottom:13px}.home{color:var(--muted);text-decoration:none}.brand small{display:block;color:var(--green);font-size:10px}.brand strong{font-size:18px}.tabs{margin-left:auto;display:flex;gap:6px}.tab{padding:8px 12px;border:1px solid var(--line);border-radius:7px;background:#fff;color:var(--muted);font-size:11px;font-weight:800}.tab.active{color:#fff;border-color:var(--green);background:var(--green)}.heading{display:flex;justify-content:space-between;align-items:end;padding:18px 0 12px}.heading h1{margin:4px 0;font-size:28px}.heading p{margin:0;color:var(--muted);font-size:11px}.badge{padding:6px 9px;border-radius:5px;color:var(--green);background:var(--soft);font-size:10px;font-weight:850}.toolbar{display:flex;gap:8px;margin-bottom:12px}.toolbar input,.toolbar select{padding:10px 11px;border:1px solid var(--line);border-radius:6px;background:#fff;color:var(--ink);font-size:11px}.toolbar input{flex:1}.layout{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:12px}.panel{background:#fff;border:1px solid var(--line);border-radius:9px;padding:14px}.table-panel{overflow:auto}.periodic{display:grid;grid-template-columns:repeat(18,minmax(42px,1fr));gap:5px;min-width:830px}.el{min-height:54px;padding:5px;border:1px solid var(--line);border-radius:5px;background:#fbfdfb;text-align:left;cursor:pointer}.el b{display:block;color:var(--green);font-size:13px}.el span{display:block;font-size:9px}.el small{display:block;margin-top:3px;color:var(--muted);font-size:8px}.el.active{border-color:var(--green);background:var(--soft);box-shadow:inset 0 0 0 1px var(--green)}.el.metal{border-top:3px solid #668aa0}.el.nonmetal{border-top:3px solid var(--orange)}.el.noble{border-top:3px solid var(--yellow)}.empty{grid-column:span 18;height:8px}.detail{min-height:510px}.detail-head{display:flex;justify-content:space-between;gap:8px;align-items:start}.detail-head h2{margin:3px 0;font-size:25px}.symbol{font-size:42px;color:var(--green);font-weight:900}.meta{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin:15px 0}.meta div{padding:9px;border:1px solid var(--line);border-radius:6px}.meta span{display:block;color:var(--muted);font-size:9px}.meta b{display:block;margin-top:3px;font-size:12px}.section{padding:12px 0;border-top:1px solid var(--line)}.section h3{margin:0 0 6px;font-size:12px}.section p{margin:0;font-size:11px;line-height:1.6}.layers{height:50px;display:flex;align-items:center;gap:8px;margin:8px 0}.layer{display:grid;place-items:center;border-radius:50%;border:1px solid var(--green);color:var(--green);background:var(--soft);font-size:9px;font-weight:800}.compare{margin-top:12px}.compare h3{margin:0 0 8px;font-size:12px}.compare-row{display:grid;grid-template-columns:100px repeat(3,1fr);gap:4px;padding:7px 0;border-top:1px solid var(--line);font-size:10px}.compare-row b{color:var(--muted)}.task{margin-top:12px;padding:12px;background:var(--blue-soft);border-radius:7px;color:#3d6479}.task p{margin:5px 0;font-size:10px}.answers{display:flex;gap:6px}.answers button{padding:8px;border:1px solid #c8dce5;border-radius:5px;background:#fff;color:#3d6479;font-size:10px;cursor:pointer}.answers button.correct{background:var(--soft);border-color:var(--green);color:var(--green)}.note{margin-top:12px;color:var(--muted);font-size:9px;line-height:1.5}@media(max-width:900px){.layout{grid-template-columns:1fr}.periodic{min-width:800px}.heading{align-items:start;flex-direction:column;gap:8px}}
:root .trivia p{padding:6px 0;border-top:1px solid var(--line);font-size:10px}:root .trivia p b{display:inline-grid;place-items:center;width:17px;height:17px;margin-right:5px;border-radius:50%;color:var(--green);background:var(--soft);font-size:9px}