/* converthubor — converthubor.org
   Lightweight, dependency-free stylesheet (no framework, no build step). */

:root{
  --brand:#4f46e5;
  --brand-2:#06b6d4;
  --brand-ink:#3730a3;
  --ink:#0f172a;
  --muted:#64748b;
  --line:#e5e7eb;
  --bg:#ffffff;
  --soft:#f8fafc;
  --soft-2:#f1f5f9;
  --ok:#059669;
  --err:#dc2626;
  --radius:14px;
  --radius-lg:20px;
  --shadow:0 1px 2px rgba(15,23,42,.06),0 8px 24px -12px rgba(15,23,42,.18);
  --shadow-hover:0 2px 4px rgba(15,23,42,.08),0 16px 40px -16px rgba(79,70,229,.35);
  --wrap:1120px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);
  font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%;height:auto;display:block}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.25;margin:0 0 .5em;font-weight:700;letter-spacing:-.01em}
h1{font-size:clamp(1.75rem,4vw,2.5rem)}
h2{font-size:clamp(1.25rem,2.5vw,1.6rem);margin-top:0}
h3{font-size:1.1rem}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.25em}
li{margin:.25em 0}
code{background:var(--soft-2);padding:.1em .35em;border-radius:5px;font-size:.92em}
hr{border:0;border-top:1px solid var(--line);margin:2rem 0}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 20px}
.muted{color:var(--muted)}
.lead{font-size:1.08rem;color:#334155;max-width:70ch}
.skip{position:absolute;left:-9999px}
.skip:focus{left:8px;top:8px;background:#fff;padding:.5rem 1rem;border-radius:8px;z-index:99}

/* ---------------------------------------------------------------- header -- */
.site-header{
  position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:.5rem;font-weight:800;font-size:1.15rem;color:var(--ink);letter-spacing:-.02em}
.brand:hover{text-decoration:none}
.brand-mark{
  display:grid;place-items:center;width:30px;height:30px;border-radius:9px;color:#fff;font-size:1rem;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
}
.site-nav{display:flex;gap:1.5rem;align-items:center}
.site-nav a{color:#334155;font-weight:500;font-size:.95rem}
.site-nav a:hover{color:var(--brand);text-decoration:none}
.nav-toggle,.nav-burger{display:none}

/* ------------------------------------------------------------------ hero -- */
.hero{
  background:
    radial-gradient(900px 380px at 12% -10%,rgba(79,70,229,.13),transparent 60%),
    radial-gradient(800px 340px at 88% 0%,rgba(6,182,212,.14),transparent 60%),
    var(--soft);
  border-bottom:1px solid var(--line);
  padding:3.5rem 0 3rem;text-align:center;
}
.hero h1{margin-bottom:.35em}
.hero .lead{margin:0 auto 2rem;text-align:center}
.hero-note{margin:1.1rem auto 0;max-width:820px;text-align:center;font-size:.9rem;color:var(--muted)}
.hero-note a{display:inline-block;margin:.18rem .3rem .18rem 0;padding:.18rem .6rem;border:1px solid var(--line);border-radius:999px;background:#fff;color:var(--brand-ink);text-decoration:none;font-weight:600}
.hero-note a:hover{border-color:var(--brand);color:var(--brand)}
.hero-badges{display:flex;gap:.6rem;justify-content:center;flex-wrap:wrap;margin-top:1.25rem}
.badge{
  font-size:.82rem;font-weight:600;color:var(--brand-ink);background:#eef2ff;
  border:1px solid #e0e7ff;border-radius:999px;padding:.3rem .75rem;
}

/* -------------------------------------------------------------- widget ---- */
.converter-card{
  max-width:720px;margin:0 auto;background:#fff;border:1px solid var(--line);
  border-radius:var(--radius-lg);padding:1.1rem;box-shadow:var(--shadow);
}
.converter-card.compact{padding:.85rem}
.conv-form{margin:0}
.drop{
  position:relative;display:flex;flex-direction:column;align-items:center;gap:.2rem;text-align:center;
  border:2px dashed #cbd5e1;border-radius:var(--radius);background:var(--soft);padding:1.6rem 1rem;
  cursor:pointer;transition:border-color .18s,background .18s;
}
.drop:hover,.drop.drag{border-color:var(--brand);background:#f5f3ff}
.drop input[type=file]{position:absolute;inset:0;opacity:0;cursor:pointer}
.drop-icon{font-size:1.6rem;line-height:1;color:var(--brand)}
.drop-title{font-weight:700}
.drop-sub{font-size:.86rem;color:var(--muted)}
.drop-file{margin-top:.35rem;font-size:.9rem;font-weight:700;color:var(--brand-ink);word-break:break-all}
.conv-row{display:flex;gap:.6rem;margin-top:.85rem;flex-wrap:wrap;align-items:flex-end}
.conv-field{flex:1 1 200px;display:flex;flex-direction:column;gap:.25rem}
.conv-label{font-size:.8rem;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.conv-field select{
  font:inherit;font-size:.98rem;border-radius:11px;border:1px solid var(--line);
  padding:.7rem .8rem;background:#fff;color:var(--ink);width:100%;cursor:pointer;
}
.conv-field select:focus{outline:2px solid #c7d2fe;border-color:var(--brand)}
.btn{
  font:inherit;font-size:.98rem;border-radius:11px;border:1px solid var(--line);
  padding:.72rem 1.5rem;background:#fff;color:var(--ink);cursor:pointer;font-weight:600;
  transition:filter .15s,transform .05s;
}
.btn:active{transform:translateY(1px)}
.btn.primary{
  border:0;color:#fff;background:linear-gradient(135deg,var(--brand),var(--brand-2));
  box-shadow:0 6px 18px -8px rgba(79,70,229,.7);
}
.btn.primary:hover{filter:brightness(1.06)}
.btn.primary:disabled{opacity:.55;cursor:not-allowed;box-shadow:none}
.conv-status{margin-top:.7rem;font-size:.92rem;color:var(--muted);min-height:1.2em}
.conv-status.err{color:var(--err)}
.conv-status.ok{color:var(--ok);font-weight:600}
.conv-progress{height:6px;border-radius:99px;background:var(--soft-2);overflow:hidden;margin-top:.6rem;display:none}
.conv-progress.show{display:block}
.conv-progress > i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--brand),var(--brand-2));transition:width .25s}
.conv-result{
  margin-top:.9rem;padding:.85rem 1rem;border-radius:12px;background:#ecfdf5;
  border:1px solid #a7f3d0;color:#065f46;font-size:.95rem;
}
.conv-result a{font-weight:800;color:#047857}

/* --------------------------------------------------------------- sections -- */
.section{padding:2.75rem 0}
.section + .section{border-top:1px solid var(--line)}
.section-head{text-align:center;max-width:640px;margin:0 auto 1.75rem}
.section-head p{color:var(--muted);margin:0}
.page-head{padding:2.25rem 0 1.25rem}
.page-head .lead{margin-bottom:0}

.crumbs{font-size:.87rem;color:var(--muted);padding-top:1.1rem}
.crumbs a{color:var(--muted)}
.crumbs span{opacity:.6;margin:0 .35rem}

/* ------------------------------------------------------------- pair cards -- */
.pair-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(178px,1fr));gap:.75rem}
.pair-card{
  display:flex;align-items:center;justify-content:center;gap:.5rem;padding:.85rem .75rem;
  border:1px solid var(--line);border-radius:var(--radius);background:#fff;color:var(--ink);
  font-weight:700;font-size:.95rem;box-shadow:var(--shadow);transition:transform .15s,box-shadow .15s,border-color .15s;
}
.pair-card:hover{text-decoration:none;transform:translateY(-2px);box-shadow:var(--shadow-hover);border-color:#c7d2fe}
.pair-arrow{color:var(--brand);font-weight:800}
.pair-to{color:var(--brand)}

.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(215px,1fr));gap:.9rem}
.cat-card{
  display:flex;flex-direction:column;gap:.2rem;padding:1.15rem;border:1px solid var(--line);
  border-radius:var(--radius);background:#fff;color:var(--ink);box-shadow:var(--shadow);
  transition:transform .15s,box-shadow .15s;
}
.cat-card:hover{text-decoration:none;transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.cat-ico{font-size:1.5rem}
.cat-name{font-weight:700}
.cat-desc{font-size:.88rem;color:var(--muted)}

.chips{display:flex;flex-wrap:wrap;gap:.5rem}
.chip{
  display:inline-block;padding:.45rem .8rem;border-radius:999px;border:1px solid var(--line);
  background:#fff;color:#334155;font-size:.88rem;font-weight:600;
}
.chip:hover{text-decoration:none;border-color:var(--brand);color:var(--brand);background:#f5f3ff}

/* ---------------------------------------------------------------- tables -- */
.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
table{border-collapse:collapse;width:100%;font-size:.94rem;background:#fff}
th,td{padding:.7rem .9rem;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
thead th{background:var(--soft);font-weight:700;white-space:nowrap}
tbody tr:last-child td{border-bottom:0}
table.kv th{width:190px;background:var(--soft);white-space:nowrap}

/* ------------------------------------------------------------------ FAQ --- */
details.faq{
  border:1px solid var(--line);border-radius:12px;background:#fff;padding:0;margin-bottom:.6rem;
  box-shadow:var(--shadow);
}
details.faq summary{
  cursor:pointer;font-weight:600;padding:.95rem 1.1rem;list-style:none;position:relative;padding-right:2.5rem;
}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{
  content:"+";position:absolute;right:1.1rem;top:50%;transform:translateY(-50%);
  color:var(--brand);font-weight:800;font-size:1.15rem;
}
details.faq[open] summary::after{content:"–"}
details.faq .faq-body{padding:0 1.1rem 1rem;color:#334155}

.steps{counter-reset:step;list-style:none;padding:0;display:grid;gap:.85rem}
.steps li{position:relative;padding-left:3rem;margin:0}
.steps li::before{
  counter-increment:step;content:counter(step);position:absolute;left:0;top:0;
  width:2rem;height:2rem;border-radius:50%;display:grid;place-items:center;font-weight:800;
  color:#fff;background:linear-gradient(135deg,var(--brand),var(--brand-2));font-size:.95rem;
}
.tips{list-style:none;padding:0;display:grid;gap:.6rem}
.tips li{position:relative;padding-left:1.6rem;margin:0}
.tips li::before{content:"✓";position:absolute;left:0;color:var(--ok);font-weight:800}

/* ------------------------------------------------------------------ blog -- */
.blog-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1rem}
.post-card{
  display:flex;flex-direction:column;gap:.4rem;padding:1.25rem;border:1px solid var(--line);
  border-radius:var(--radius);background:#fff;box-shadow:var(--shadow);color:var(--ink);
  transition:transform .15s,box-shadow .15s;
}
.post-card:hover{text-decoration:none;transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.post-card h3{margin:0;font-size:1.05rem}
.post-card p{margin:0;color:var(--muted);font-size:.92rem}
.post-meta{font-size:.8rem;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.post{max-width:760px}
.post h2{margin-top:1.8em}
.post h3{margin-top:1.4em}
.post ul,.post ol{padding-left:1.4em}
.post blockquote{
  margin:1.4em 0;padding:.9rem 1.2rem;border-left:4px solid var(--brand);background:var(--soft);
  border-radius:0 12px 12px 0;color:#334155;
}
.post .cta{
  margin:2em 0;padding:1.25rem 1.4rem;border-radius:var(--radius);border:1px solid #e0e7ff;
  background:linear-gradient(135deg,#eef2ff,#ecfeff);
}
.post .cta p{margin:0 0 .8rem;font-weight:600}
.toc{border:1px solid var(--line);border-radius:12px;padding:1rem 1.2rem;background:var(--soft);margin:1.5rem 0}
.toc strong{display:block;margin-bottom:.4rem}
.toc ul{margin:0;padding-left:1.2em}

/* ---------------------------------------------------------------- footer -- */
.site-footer{background:#0f172a;color:#cbd5e1;padding:2.75rem 0 1.5rem;margin-top:3rem}
.site-footer a{color:#cbd5e1}
.site-footer a:hover{color:#fff}
.site-footer .brand{color:#fff}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:1.5rem}
.footer-grid h4{color:#fff;font-size:.95rem;margin-bottom:.6rem}
.footer-grid a{display:block;font-size:.9rem;padding:.12rem 0}
.footer-bottom{
  border-top:1px solid rgba(148,163,184,.2);margin-top:2rem;padding-top:1rem;
  display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;font-size:.85rem;color:#94a3b8;
}
.footer-grid .muted{color:#94a3b8;font-size:.9rem;margin-top:.6rem}

/* ------------------------------------------------------------ responsive -- */
@media (max-width:860px){
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:720px){
  .nav-burger{display:grid;gap:4px;cursor:pointer;padding:.5rem}
  .nav-burger span{display:block;width:22px;height:2px;background:var(--ink);border-radius:2px}
  .site-nav{
    display:none;position:absolute;top:64px;left:0;right:0;background:#fff;
    border-bottom:1px solid var(--line);flex-direction:column;gap:0;padding:.5rem 20px 1rem;
    box-shadow:0 12px 24px -16px rgba(15,23,42,.4);
  }
  .nav-toggle:checked ~ .site-nav{display:flex}
  .site-nav a{padding:.7rem 0;border-bottom:1px solid var(--soft-2);width:100%}
  .hero{padding:2.5rem 0 2.25rem}
  .section{padding:2rem 0}
  table.kv th{width:auto}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}