/* ===== RESET & BASE ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --primary:#e67e22;--primary-dark:#d35400;--primary-light:#fdebd0;
  --bg:#fffaf5;--surface:#fff;--text:#2c3e50;--text-light:#7f8c8d;
  --border:#e8e0d8;--radius:12px;--shadow:0 2px 12px rgba(0,0,0,.06);
  --max-w:900px;
}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:'Segoe UI',system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text);line-height:1.7;min-height:100vh;display:flex;flex-direction:column}
a{color:var(--primary-dark);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto}

/* ===== HEADER ===== */
header{background:var(--primary);color:#fff;padding:0}
.header-inner{max-width:var(--max-w);margin:0 auto;padding:1rem 1.5rem;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:.5rem}
.logo{font-size:1.4rem;font-weight:700;color:#fff;display:flex;align-items:center;gap:.5rem}
.logo:hover{text-decoration:none}


/* ===== MAIN ===== */
main{max-width:var(--max-w);margin:0 auto;padding:2rem 1.5rem;flex:1;width:100%}
h1{font-size:2rem;margin-bottom:1rem;color:var(--text)}
h2{font-size:1.5rem;margin:2rem 0 1rem;color:var(--text)}
h3{font-size:1.2rem;margin:1.5rem 0 .5rem}
p{margin-bottom:1rem}

/* ===== HERO ===== */
.hero{text-align:center;padding:2rem 0 1rem}
.hero h1{font-size:2.2rem}
.hero p{font-size:1.15rem;color:var(--text-light);max-width:600px;margin:0 auto 2rem}

/* ===== CONVERTER CARD ===== */
.converter{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);padding:2rem;margin-bottom:2rem;border:1px solid var(--border)}
.converter h2{margin-top:0;font-size:1.3rem;color:var(--primary-dark)}
.form-row{display:flex;gap:1rem;align-items:flex-end;flex-wrap:wrap;margin-bottom:1rem}
.form-group{flex:1;min-width:140px}
.form-group label{display:block;font-size:.85rem;color:var(--text-light);margin-bottom:.3rem;font-weight:600}
.form-group input,.form-group select{width:100%;padding:.7rem .9rem;border:2px solid var(--border);border-radius:8px;font-size:1rem;transition:border-color .2s}
.form-group input:focus,.form-group select:focus{outline:none;border-color:var(--primary)}
.result-box{background:var(--primary-light);border-radius:8px;padding:1.2rem;text-align:center;font-size:1.4rem;font-weight:700;color:var(--primary-dark);min-height:60px;display:flex;align-items:center;justify-content:center;margin-top:.5rem}

/* ===== TABLE ===== */
.data-table{width:100%;border-collapse:collapse;margin:1rem 0 2rem;background:var(--surface);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.data-table th{background:var(--primary);color:#fff;padding:.8rem 1rem;text-align:left;font-size:.9rem}
.data-table td{padding:.7rem 1rem;border-bottom:1px solid var(--border);font-size:.95rem}
.data-table tr:last-child td{border-bottom:none}
.data-table tr:hover td{background:var(--primary-light)}

/* ===== CARDS GRID ===== */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.2rem;margin:1.5rem 0}
.card{background:var(--surface);border-radius:var(--radius);padding:1.5rem;box-shadow:var(--shadow);border:1px solid var(--border);transition:transform .2s,box-shadow .2s;text-align:center}
.card:hover{transform:translateY(-3px);box-shadow:0 4px 20px rgba(0,0,0,.1)}
.card-icon{font-size:2.5rem;margin-bottom:.5rem}
.card h3{margin:0 0 .5rem;font-size:1.1rem}
.card p{color:var(--text-light);font-size:.9rem;margin:0}
.card a{display:inline-block;margin-top:.8rem;color:var(--primary-dark);font-weight:600}

/* ===== SEO CONTENT ===== */
.seo-content{background:var(--surface);border-radius:var(--radius);padding:2rem;margin:2rem 0;border:1px solid var(--border)}
.seo-content h2{margin-top:0}
.seo-content ul{padding-left:1.5rem;margin-bottom:1rem}
.seo-content li{margin-bottom:.4rem}

/* ===== ACCESSIBILITY ===== */
.skip-to-content{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden;z-index:1000;background:var(--primary);color:#fff;padding:.75rem 1.5rem;border-radius:0 0 8px 0;font-weight:600;text-decoration:none}
.skip-to-content:focus{position:fixed;left:0;top:0;width:auto;height:auto;overflow:visible}
*:focus-visible{outline:2px solid var(--primary);outline-offset:2px}

/* ===== HAMBURGER ===== */
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:.5rem}
.nav-toggle svg{width:24px;height:24px;stroke:#fff;stroke-width:2;fill:none}
nav ul.nav-links{display:flex;gap:1.2rem;list-style:none;flex-wrap:wrap}
nav ul.nav-links a{color:rgba(255,255,255,.9);font-size:.95rem;font-weight:500}
nav ul.nav-links a:hover{color:#fff;text-decoration:underline}

/* ===== FOOTER (columns) ===== */
.site-footer{background:#2c3e50;color:rgba(255,255,255,.7);padding:2.5rem 1.5rem;margin-top:auto;font-size:.85rem}
.site-footer .container{max-width:var(--max-w);margin:0 auto}
.site-footer .footer-inner{display:flex;gap:2rem;justify-content:space-between}
.site-footer .footer-col h4{color:#fff;font-size:.9rem;margin-bottom:.75rem}
.site-footer .footer-col p{font-size:.85rem;max-width:200px}
.site-footer .footer-col ul{list-style:none}
.site-footer .footer-col li{margin-bottom:.4rem}
.site-footer .footer-col a{color:rgba(255,255,255,.8)}
.site-footer .footer-col a:hover{color:#fff}
.site-footer .footer-bottom{border-top:1px solid rgba(255,255,255,.15);margin-top:1.5rem;padding-top:1rem;text-align:center}
.site-footer .footer-bottom a{color:#94a3b8}
.site-footer .footer-bottom a:hover{color:#fff}

/* ===== RESPONSIVE ===== */
@media(max-width:768px){
  .nav-toggle{display:block}
  nav ul.nav-links{display:none;flex-direction:column;width:100%;gap:.5rem;padding-top:.75rem}
  nav ul.nav-links.open{display:flex}
  .header-inner{flex-wrap:wrap;justify-content:space-between}
  .site-footer .footer-inner{flex-direction:column;gap:1.5rem}
}
@media(max-width:600px){
  .hero h1{font-size:1.6rem}
  .form-row{flex-direction:column}
  .form-group{min-width:100%}
  main{padding:1.5rem 1rem}
  .converter{padding:1.2rem}
}