/* Reset & Base */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#2563eb;
  --primary-dark:#1d4ed8;
  --bg:#f8fafc;
  --surface:#fff;
  --text:#1e293b;
  --text-light:#64748b;
  --border:#e2e8f0;
  --radius:8px;
  --shadow:0 1px 3px rgba(0,0,0,.1);
  --max-w:960px;
}
input:focus::placeholder{opacity:0;transition:opacity .2s}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:var(--max-w);margin:0 auto;padding:0 1rem}

/* Header */
.header{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100}
.header .container{display:flex;align-items:center;justify-content:space-between;height:56px}
.logo{font-size:1.25rem;font-weight:700;color:var(--text);display:flex;align-items:center;gap:5px}
.logo span{color:var(--text)}.logo .logo-cz{color:var(--primary)}
.logo-icon{flex-shrink:0}
.nav-links a svg{vertical-align:-2px}
.nav{display:flex;align-items:center;gap:1rem}
.nav-toggle{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--text)}
.nav-links{display:flex;gap:1.5rem;align-items:center}
.nav-links a{color:var(--text);font-size:.9rem;font-weight:500}
.nav-links a:hover{color:var(--primary);text-decoration:none}
.dropdown{position:relative}
.dropdown-menu{display:none;position:absolute;top:100%;left:0;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);min-width:180px;padding:.5rem 0;z-index:50}
.dropdown:hover .dropdown-menu{display:block}
.dropdown-menu a{display:block;padding:.4rem 1rem;font-size:.85rem}
.dropdown-menu a:hover{background:var(--bg)}

/* Hero */
.hero{text-align:center;padding:3rem 0 2rem}
.hero h1{font-size:2rem;margin-bottom:.5rem}
.hero p{color:var(--text-light);font-size:1.1rem;max-width:600px;margin:0 auto}

/* Cards */
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:1rem;margin-top:1rem}
.card{display:block;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem;transition:box-shadow .2s,border-color .2s;text-decoration:none;color:var(--text)}
.card:hover{box-shadow:0 4px 12px rgba(0,0,0,.1);border-color:var(--primary);text-decoration:none}
.card-icon{font-size:2rem;display:block;margin-bottom:.5rem}
.card h3{font-size:1rem;margin-bottom:.25rem}
.card p{font-size:.85rem;color:var(--text-light);margin:0}

/* Sections */
.section{padding:2rem 0}
.section h2{font-size:1.5rem;margin-bottom:1rem}
.subtitle{color:var(--text-light);margin-bottom:1.5rem}

/* Breadcrumb */
.breadcrumb{padding:1rem 0 .5rem;font-size:.85rem;color:var(--text-light)}
.breadcrumb a{color:var(--text-light)}
.breadcrumb a:hover{color:var(--primary)}

/* Converter Box */
.converter-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem;margin:1.5rem 0;box-shadow:var(--shadow)}
.converter-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.converter-field label{display:block;font-size:.8rem;font-weight:600;color:var(--text-light);margin-bottom:.25rem;text-transform:uppercase;letter-spacing:.03em}
.converter-field input,.converter-field select{width:100%;padding:.6rem .75rem;border:1px solid var(--border);border-radius:var(--radius);font-size:1rem;background:var(--bg);color:var(--text)}
.converter-field input:focus,.converter-field select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.15)}
.swap-btn{text-align:center;font-size:1.5rem;padding:.5rem;cursor:pointer;color:var(--primary);user-select:none}
.swap-btn:hover{color:var(--primary-dark)}

/* Pair converter */
.pair-converter{display:flex;align-items:center;gap:1rem;flex-wrap:wrap}
.pair-input{flex:1;min-width:200px}
.pair-input label,.pair-result label{display:block;font-size:.8rem;font-weight:600;color:var(--text-light);margin-bottom:.25rem;text-transform:uppercase;letter-spacing:.03em}
.pair-input input{width:100%;padding:.6rem .75rem;border:1px solid var(--border);border-radius:var(--radius);font-size:1.2rem;background:var(--bg)}
.pair-input input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.15)}
.pair-equals{font-size:2rem;font-weight:700;color:var(--text-light)}
.pair-result{flex:1;min-width:200px}
.pair-result-value{font-size:1.5rem;font-weight:700;color:var(--primary);padding:.5rem 0}

/* Formula */
.formula-box{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:1rem;font-size:1.1rem;margin-bottom:1rem}
.formula-box code{font-family:"SF Mono",Monaco,Consolas,monospace}

/* Data Table */
.data-table{width:100%;border-collapse:collapse;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.data-table th,.data-table td{padding:.6rem 1rem;text-align:left;border-bottom:1px solid var(--border)}
.data-table th{background:var(--bg);font-size:.85rem;font-weight:600;color:var(--text-light);text-transform:uppercase;letter-spacing:.03em}
.data-table tr:last-child td{border-bottom:none}
.data-table tr:hover td{background:rgba(37,99,235,.03)}

/* Results table (generated by JS) */
.results-table{overflow-x:auto}
.results-table table{width:100%;border-collapse:collapse}
.results-table th,.results-table td{padding:.5rem .75rem;border:1px solid var(--border);text-align:right;font-size:.85rem;white-space:nowrap}
.results-table th{background:var(--bg);font-weight:600}

/* Pair links */
.pair-links{display:flex;flex-wrap:wrap;gap:.5rem}
.pair-links a{display:inline-block;padding:.35rem .75rem;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);font-size:.8rem;color:var(--text);white-space:nowrap}
.pair-links a:hover{border-color:var(--primary);color:var(--primary);text-decoration:none}

/* Calculator forms */
.calc-form{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem;margin:1.5rem 0;box-shadow:var(--shadow)}
.calc-group{margin-bottom:1rem}
.calc-group label{display:block;font-weight:600;margin-bottom:.25rem}
.calc-group .input-wrap{display:flex;align-items:center;gap:.5rem}
.calc-group input,.calc-group select{padding:.6rem .75rem;border:1px solid var(--border);border-radius:var(--radius);font-size:1rem;flex:1;background:var(--bg)}
.calc-group input:focus,.calc-group select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(37,99,235,.15)}
.calc-group .unit-label{font-size:.9rem;color:var(--text-light);min-width:2rem}
.calc-btn{display:inline-block;padding:.7rem 2rem;background:var(--primary);color:#fff;border:none;border-radius:var(--radius);font-size:1rem;font-weight:600;cursor:pointer;transition:background .2s}
.calc-btn:hover{background:var(--primary-dark)}
.calc-result{margin-top:1.5rem;padding:1.25rem;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius)}
.calc-result h3{margin-bottom:.5rem}
.calc-result .big-number{font-size:2rem;font-weight:700;color:var(--primary)}
.calc-result p{margin:.25rem 0;color:var(--text-light)}

/* Percent calc */
.percent-section{margin-bottom:1.5rem;padding:1.25rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius)}
.percent-section h3{margin-bottom:.75rem;font-size:1rem}
.percent-row{display:flex;align-items:center;gap:.5rem;flex-wrap:wrap}
.percent-row input{width:100px;padding:.5rem;border:1px solid var(--border);border-radius:var(--radius);font-size:1rem}
.percent-row .result-inline{font-weight:700;color:var(--primary);font-size:1.1rem;min-width:80px}

/* Features grid */
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1.5rem}
.feature{padding:1.25rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius)}
.feature h3{font-size:1rem;margin-bottom:.5rem}
.feature p{font-size:.9rem;color:var(--text-light)}

/* SEO text */
.seo-text{border-top:1px solid var(--border);margin-top:1rem}

/* Footer */
.footer{background:var(--surface);border-top:1px solid var(--border);padding:2rem 0 1rem;margin-top:3rem}
.footer-section{margin-bottom:1.5rem}
.footer-section h3{font-size:.95rem;margin-bottom:.75rem;border-bottom:1px solid var(--border);padding-bottom:.5rem}
.footer-links{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:.25rem .5rem}
.footer a{color:var(--text-light);font-size:.85rem}
.footer a:hover{color:var(--primary)}
.footer p{font-size:.85rem;color:var(--text-light)}
.disclaimer{margin-top:1.5rem;padding:1rem;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);font-size:.75rem;color:var(--text-light);line-height:1.5}
.copyright{margin-top:1.5rem;padding-top:1rem;border-top:1px solid var(--border);text-align:center;font-size:.8rem;color:var(--text-light)}

/* Kitchen measures */
.kitchen-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1rem;margin:1rem 0}
.kitchen-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1rem}
.kitchen-card h3{font-size:.95rem;margin-bottom:.5rem}
.kitchen-card table{width:100%;font-size:.85rem}
.kitchen-card td{padding:.2rem .5rem;border-bottom:1px solid var(--border)}

/* Numeral system */
.numeral-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:1rem;margin:1rem 0}
.numeral-item label{display:block;font-size:.8rem;font-weight:600;color:var(--text-light);margin-bottom:.25rem}
.numeral-item input{width:100%;padding:.5rem;border:1px solid var(--border);border-radius:var(--radius);font-size:1rem;font-family:monospace}

/* BMI scale */
.bmi-scale{display:flex;gap:0;margin:1rem 0;border-radius:var(--radius);overflow:hidden;height:30px}
.bmi-scale div{flex:1;display:flex;align-items:center;justify-content:center;font-size:.7rem;font-weight:600;color:#fff}

/* Table scroll - wrap all data tables for mobile */
.calc-result,.calc-form,.section{overflow-x:auto;-webkit-overflow-scrolling:touch}

/* Responsive - tablet */
@media(max-width:768px){
  .footer-links{grid-template-columns:repeat(2,1fr)}
  .converter-row{grid-template-columns:1fr}
  .card-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr))}
  .calc-group .input-wrap{flex-wrap:wrap}
}

/* Responsive - mobile */
@media(max-width:640px){
  .nav-toggle{display:block}
  .nav-links{display:none;position:absolute;top:56px;left:0;right:0;background:var(--surface);border-bottom:1px solid var(--border);flex-direction:column;padding:1rem;gap:1rem;box-shadow:var(--shadow)}
  .nav-links.open{display:flex}
  .dropdown-menu{position:static;box-shadow:none;border:none;padding-left:1rem}
  .dropdown:hover .dropdown-menu{display:none}
  .dropdown.open .dropdown-menu{display:block}
  .hero h1{font-size:1.5rem}
  .hero p{font-size:.95rem}
  .card-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr))}
  .pair-converter{flex-direction:column;align-items:stretch}
  .pair-equals{text-align:center}
  .footer-links{grid-template-columns:1fr}
  .percent-row{flex-direction:column;align-items:stretch}
  .percent-row input{width:100%}
  .calc-form{padding:1rem}
  .calc-result .big-number{font-size:1.5rem}
  .data-table th,.data-table td{padding:.4rem .5rem;font-size:.8rem}
  .section h2{font-size:1.25rem}
}