*{margin:0;padding:0;box-sizing:border-box}
body{font:16px/1.65 "Segoe UI",Tahoma,Geneva,Verdana,sans-serif;color:#333;background:#f5f0e3}
a{color:#1a0dab;text-decoration:none}a:hover{text-decoration:underline}

/* Header */
.hd{background:#f5f0e3;border-bottom:1px solid #d4c9a8;padding:0 20px}
.hd-in{max-width:1100px;margin:0 auto;display:flex;align-items:center;height:52px;gap:28px}
.logo{font:bold 1.4rem/1 Georgia,serif;color:#333;letter-spacing:-.5px}.logo span{color:#4a90d9}.logo:hover{text-decoration:none}
.topnav{display:flex;gap:22px}.topnav a{color:#555;font-size:.95rem}.topnav a:hover{color:#1a0dab}
.menu-btn{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;margin-left:auto}
@media(max-width:768px){.topnav{display:none;position:absolute;top:52px;left:0;right:0;background:#f5f0e3;flex-direction:column;padding:12px 20px;border-bottom:1px solid #d4c9a8;z-index:99}.topnav.open{display:flex}.menu-btn{display:block}}

/* Layout — 2 column */
.page{max-width:1100px;margin:0 auto;padding:16px 20px 40px;display:flex;gap:24px}
.main{flex:1;min-width:0}
.side{width:300px;flex-shrink:0}
@media(max-width:900px){.page{flex-direction:column}.side{width:100%}}

/* Breadcrumbs */
.bc{font-size:.85rem;color:#666;margin-bottom:14px}.bc a{color:#666}.bc a:hover{color:#1a0dab}

/* Typography */
h1{font:600 1.65rem/1.3 Georgia,serif;color:#222;margin-bottom:10px}
h2{font:600 1.2rem/1.3 Georgia,serif;color:#222;margin:24px 0 10px}
h3{font-size:1.05rem;margin:14px 0 8px;font-weight:600}
p{margin-bottom:10px;color:#444;font-size:.95rem}
.desc{color:#666;margin-bottom:16px;font-size:1rem}

/* Converter box */
.cbox{background:#fff;border:1px solid #d4c9a8;border-radius:6px;padding:18px;margin-bottom:18px}
.crow{display:flex;gap:12px;align-items:flex-end;flex-wrap:wrap}
.cfield{flex:1;min-width:160px}
.cfield label{display:block;font-size:.8rem;font-weight:600;color:#666;margin-bottom:4px;text-transform:uppercase;letter-spacing:.5px}
.cfield input,.cfield select{width:100%;padding:10px 12px;border:1px solid #ccc;border-radius:4px;font-size:1.05rem;background:#fff}
.cfield input:focus,.cfield select:focus{outline:none;border-color:#4a90d9;box-shadow:0 0 0 2px rgba(74,144,217,.15)}
.swap{width:38px;height:38px;border-radius:50%;background:#fff;border:1px solid #ccc;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:1.1rem;flex-shrink:0}
.swap:hover{background:#e8f0fe;border-color:#4a90d9}
.formula{background:#e8f4e8;border-radius:4px;padding:10px 14px;margin-bottom:16px;font-size:.9rem;color:#2d5a2d;border:1px solid #b8d4b8}

/* Tables */
table{width:100%;border-collapse:collapse;margin-bottom:16px;font-size:.92rem}
th,td{padding:8px 12px;text-align:left;border-bottom:1px solid #ddd}
th{background:#f0ebe0;color:#555;font-weight:600;font-size:.82rem;text-transform:uppercase;letter-spacing:.3px}
tr:hover td{background:#faf8f2}

/* Calc */
.calcbox{background:#fff;border:1px solid #d4c9a8;border-radius:6px;padding:18px;margin-bottom:16px}
.calcrow{display:flex;align-items:center;gap:10px;margin-bottom:10px;flex-wrap:wrap}
.calcrow label{min-width:140px;font-size:.95rem;font-weight:500}
.calcrow input,.calcrow select{padding:9px 11px;border:1px solid #ccc;border-radius:4px;font-size:1rem}
.calcrow input:focus{outline:none;border-color:#4a90d9}
.result{background:#fff;border:2px solid #4a90d9;border-radius:6px;padding:16px;text-align:center;margin-top:12px}
.result strong{font-size:1.6rem;color:#4a90d9}
.result .rl{display:block;font-size:.8rem;color:#888;margin-bottom:2px}
.btn{background:#4a90d9;color:#fff;border:none;padding:10px 22px;border-radius:4px;font-size:.95rem;cursor:pointer}.btn:hover{background:#3a7bc8}
.btn-green{background:#2e7d32}.btn-green:hover{background:#256428}
.btn-red{background:#c62828}.btn-red:hover{background:#a52222}
.btn-gray{background:#757575}.btn-gray:hover{background:#616161}

/* See Also */
.see-also{background:#f0ebe0;border-radius:6px;padding:16px;margin:20px 0}
.see-also h2{margin:0 0 10px;font-size:1rem}
.sa-pills{display:flex;flex-wrap:wrap;gap:8px}
.sa-pills a{display:inline-block;padding:8px 18px;background:#2e7d32;color:#fff;border-radius:4px;font-size:.88rem;font-weight:500}
.sa-pills a:hover{background:#256428;text-decoration:none}

/* Feedback */
.feedback{margin-top:24px;border-top:1px solid #ddd;padding-top:20px}
.feedback h2{font-size:1.1rem;margin-bottom:10px}
.feedback textarea{width:100%;min-height:100px;padding:10px;border:1px solid #ccc;border-radius:4px;font-size:.9rem;resize:vertical}
.feedback textarea:focus{outline:none;border-color:#4a90d9}
.feedback .btn{margin-top:8px;background:#757575}

/* Sidebar */
.side-ad{margin-bottom:18px}
.side-box{background:#f0ebe0;border:1px solid #d4c9a8;margin-bottom:18px;border-radius:0}
.side-box h3{background:#666;color:#fff;padding:8px 12px;font-size:.82rem;text-transform:uppercase;letter-spacing:.5px;font-weight:600;margin:0}
.side-box ul{list-style:disc;padding:12px 12px 12px 28px;margin:0}
.side-box li{padding:3px 0;font-size:.9rem}
.side-box a{color:#1a0dab}

/* Related pills (in main content) */
.pills{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:16px}
.pills a{padding:6px 14px;background:#f0ebe0;border:1px solid #d4c9a8;border-radius:16px;font-size:.84rem;color:#1a0dab}
.pills a:hover{background:#e8e0cc;text-decoration:none}

/* Grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:1px;background:#d4c9a8;border:1px solid #d4c9a8;border-radius:4px;overflow:hidden;margin-bottom:18px}
.grid a{background:#fff;padding:12px 14px;color:#1a0dab;font-size:.92rem;display:block}
.grid a:hover{background:#faf8f2;text-decoration:none}
.grid a .gi{color:#777;font-size:.78rem;margin-top:2px}

/* Link list */
.ll{columns:2;column-gap:24px;margin-bottom:16px}
.ll a{display:block;padding:4px 0;font-size:.92rem;color:#1a0dab}
@media(max-width:500px){.ll{columns:1}}

/* FAQ */
.faq{margin-top:20px}.faq details{border:1px solid #ddd;border-radius:4px;margin-bottom:6px;background:#fff}
.faq summary{padding:12px 14px;cursor:pointer;font-weight:500;font-size:.92rem;list-style:none}
.faq summary::after{content:"+";float:right;color:#999}
.faq details[open] summary::after{content:"−"}
.faq p{padding:0 14px 12px;color:#555;font-size:.9rem}

/* Ad */
.ad{margin:16px 0}

/* Textarea */
.ta{width:100%;min-height:80px;padding:10px 12px;border:1px solid #ccc;border-radius:4px;font-family:monospace;font-size:1rem;resize:vertical}
.ta:focus{outline:none;border-color:#4a90d9}
.copy-btn{background:#4a90d9;color:#fff;border:none;padding:5px 14px;border-radius:4px;font-size:.8rem;cursor:pointer;margin-top:6px}

/* Search */
.search-input{width:100%;padding:10px 14px;border:1px solid #ccc;border-radius:4px;font-size:1rem;margin-bottom:14px;background:#fff}
.search-input:focus{outline:none;border-color:#4a90d9}

/* Ref tables */
.char-cell{font-size:1.2rem;font-weight:700;text-align:center;min-width:36px}
.swatch{display:inline-block;width:32px;height:18px;border-radius:3px;vertical-align:middle;border:1px solid #ccc}

/* Scientific calc */
.sci-grid{display:grid;grid-template-columns:repeat(8,1fr);gap:3px;margin-bottom:12px}
.sci-grid button{padding:12px 4px;font-size:1rem;border:1px solid #ccc;border-radius:4px;cursor:pointer;background:#f8f8f8}
.sci-grid button:hover{background:#e8e8e8}
.sci-grid .ac{background:#ef5350;color:#fff}.sci-grid .eq{background:#4caf50;color:#fff}
.sci-grid .fn{background:#e8f5e9}

/* Footer */
.ft{background:#f5f0e3;border-top:1px solid #d4c9a8;margin-top:30px;padding:16px 20px;text-align:center;font-size:.82rem;color:#888}
.ft a{color:#888}.ft a:hover{color:#1a0dab}
.ft-nav{margin-bottom:6px}.ft-links{margin-bottom:6px}

/* Cookie */
.cookie-bar{display:none;position:fixed;bottom:0;left:0;right:0;background:#333;color:#fff;padding:12px 20px;font-size:.85rem;z-index:999;text-align:center}
.cookie-bar a{color:#8ab4f8}
.cookie-bar button{background:#4a90d9;color:#fff;border:none;padding:6px 18px;border-radius:4px;margin-left:12px;cursor:pointer}

/* SEO */
.seo{margin-top:20px;color:#555;font-size:.92rem;line-height:1.7}
.seo h2{color:#222;font-size:1.05rem;margin-top:16px;margin-bottom:4px}

@media(max-width:768px){
  h1{font-size:1.4rem}
  .sci-grid{grid-template-columns:repeat(4,1fr)}
  .grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr))}
}