:root{color-scheme:light;--bg:#f3f4f6;--panel:#fff;--text:#202124;--muted:#666;--line:#dedfe3;--key:#f1f2f4;--key-hover:#e4e6eb;--accent:#0878d1;--accent-text:#fff;--shadow:0 12px 36px #1112;font:16px/1.45 "Segoe UI",system-ui,sans-serif}
:root[data-theme="dark"]{color-scheme:dark;--bg:#191919;--panel:#242424;--text:#f5f5f5;--muted:#b7b7b7;--line:#3d3d3d;--key:#343434;--key-hover:#444;--accent:#36a9e8;--accent-text:#071521;--shadow:0 12px 36px #0005}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);min-height:100vh}button,input,select{font:inherit;color:inherit}button{cursor:pointer}a{color:inherit;text-decoration:none}.shell{min-height:100vh;display:grid;grid-template-columns:260px minmax(0,1fr)}.sidebar{background:var(--panel);border-right:1px solid var(--line);padding:18px 12px;display:flex;flex-direction:column;gap:4px}.brand{font-weight:650;font-size:1.1rem;padding:7px 12px 18px}.nav-label{color:var(--muted);font-size:.78rem;font-weight:650;text-transform:uppercase;letter-spacing:.06em;padding:14px 12px 5px}.nav-link,.nav-action{border:0;background:transparent;text-align:left;border-radius:8px;padding:10px 12px;display:flex;gap:12px;align-items:center;min-height:42px}.nav-link:hover,.nav-action:hover{background:var(--key)}.nav-link.active{background:color-mix(in srgb,var(--accent) 15%,var(--panel));box-shadow:inset 3px 0 var(--accent)}.nav-icon{width:20px;text-align:center;color:var(--muted)}.sidebar-bottom{margin-top:auto;border-top:1px solid var(--line);padding-top:10px}.main{min-width:0;padding:clamp(16px,4vw,40px)}.content{width:min(100%,760px);margin:0 auto}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:24px}.topbar h1{font-size:1.35rem;margin:0}.top-actions{display:flex;gap:8px}.icon-button,.small-button{border:1px solid var(--line);background:var(--panel);border-radius:8px;padding:8px 11px}.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:clamp(16px,3vw,24px);box-shadow:var(--shadow);margin-bottom:18px}.display{min-height:150px;display:flex;flex-direction:column;justify-content:flex-end;align-items:flex-end;overflow-wrap:anywhere}.expression{color:var(--muted);min-height:28px}.result{font-size:clamp(2rem,8vw,3.6rem);font-weight:350;line-height:1.1}.keypad{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:7px}.key{border:0;background:var(--key);border-radius:9px;min-height:54px;font-size:1.05rem}.key:hover{background:var(--key-hover)}.key.operator{font-weight:650}.key.equals{background:var(--accent);color:var(--accent-text)}.toolbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:14px}.toolbar select,.field,input[type="number"],input[type="text"],input[type="date"]{border:1px solid var(--line);background:var(--panel);border-radius:8px;padding:10px 12px;min-height:42px}.toolbar select{min-width:200px}.history-head{display:flex;align-items:center;justify-content:space-between;gap:12px}.history-list{display:grid;gap:8px;margin-top:12px}.history-row{display:flex;align-items:center;justify-content:space-between;gap:12px;border-top:1px solid var(--line);padding:10px 0}.history-row small{display:block;color:var(--muted)}.history-row button{border:0;background:transparent;color:var(--muted);padding:6px}.muted{color:var(--muted)}.menu-toggle{display:none}.graph-input{display:flex;gap:8px}.graph-input input{flex:1;min-width:0}.graph-canvas{width:100%;height:360px;display:block;border:1px solid var(--line);border-radius:10px;background:var(--panel);touch-action:none}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.form-field{display:grid;gap:6px}.form-field label{font-size:.88rem;color:var(--muted)}.converter-result{font-size:1.6rem;font-weight:600;overflow-wrap:anywhere}.status{min-height:1.4em;color:var(--muted);font-size:.9rem}.hidden{display:none!important}
@media(max-width:760px){.shell{grid-template-columns:1fr}.sidebar{display:none;position:fixed;z-index:5;inset:0 auto 0 0;width:min(290px,86vw);box-shadow:var(--shadow);overflow:auto}.sidebar.open{display:flex}.menu-toggle{display:inline-block}.main{padding:18px 12px}.key{min-height:52px}.graph-canvas{height:300px}}
@media(max-width:430px){.keypad{gap:5px}.key{min-height:48px;font-size:.96rem}.form-grid{grid-template-columns:1fr}.history-row{align-items:flex-start}.topbar h1{font-size:1.2rem}}
.converter-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,250px),1fr));gap:10px}.converter-tile{min-width:0;display:grid;grid-template-columns:38px minmax(0,1fr) 18px;align-items:center;gap:12px;padding:14px;border:1px solid var(--line);border-radius:10px;background:var(--panel)}.converter-tile:hover{background:var(--key)}.converter-tile-icon{width:36px;height:36px;border-radius:9px;background:var(--key);display:grid;place-items:center;color:var(--accent);font-size:1.15rem}.converter-tile strong,.converter-tile small{display:block}.converter-tile small{margin-top:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--muted);font-size:.76rem}.content>header.topbar{margin-bottom:22px}