:root{
  --bg:#f8fafc;
  --panel:#ffffff;
  --text:#111827;
  --muted:#4b5563;
  --line:#e5e7eb;
  --soft:#f3f4f6;
  --accent:#111827;
  --accent-2:#2563eb;
  --chip:#eef2ff;
  --shadow:0 12px 24px rgba(17,24,39,.06);
  --radius:18px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:Arial,Helvetica,sans-serif;
  color:var(--text);
  background:linear-gradient(180deg,#f8fafc 0,#ffffff 180px);
  line-height:1.55;
}
a{color:inherit;text-decoration:none}
a:hover{text-decoration:none}
.container{max-width:1140px;margin:0 auto;padding:0 18px}
.site-header{
  position:sticky;top:0;z-index:40;
  backdrop-filter:saturate(180%) blur(8px);
  background:rgba(248,250,252,.9);
  border-bottom:1px solid rgba(229,231,235,.9);
}
.site-header-inner{
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  min-height:72px;
}
.brand-wrap{display:flex;align-items:center;gap:14px}
.brand{
  display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.15rem;
}
.brand-badge{
  width:38px;height:38px;border-radius:12px;background:#111827;color:#fff;
  display:grid;place-items:center;font-weight:800;box-shadow:var(--shadow)
}
.tagline{
  display:block;font-size:.9rem;color:var(--muted);margin-top:2px
}
.top-nav{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.top-nav a{
  padding:10px 14px;border-radius:12px;color:var(--muted);font-weight:700
}
.top-nav a.active,.top-nav a:hover{background:var(--panel);color:var(--text);box-shadow:var(--shadow)}
.mode-toggle{
  padding:10px 14px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--muted);font-weight:700
}

.hero{
  padding:32px 0 16px;
}
.hero-panel{
  background:var(--panel);border:1px solid var(--line);border-radius:28px;box-shadow:var(--shadow);
  padding:26px;
}
.kicker{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:var(--soft);color:var(--muted);font-weight:700;font-size:.9rem}
h1,h2,h3,h4{line-height:1.15;margin:0 0 12px}
.hero h1{font-size:2.3rem;margin-top:14px}
.lead{font-size:1.06rem;color:var(--muted);max-width:900px}
.popular-strip{margin-top:20px}
.popular-strip-label{font-size:.9rem;font-weight:800;color:var(--muted);margin-bottom:10px}
.chips{display:flex;gap:10px;flex-wrap:wrap}
.chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 14px;border-radius:999px;background:var(--chip);border:1px solid #dbeafe;
  color:#1e3a8a;font-weight:700
}
.section{padding:18px 0}
.section-title{display:flex;align-items:end;justify-content:space-between;gap:14px;margin-bottom:14px}
.section-title p{margin:0;color:var(--muted)}
.grid{display:grid;gap:16px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.card{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:18px
}
.card p{margin:0;color:var(--muted)}
.card .eyebrow{font-size:.8rem;color:var(--muted);font-weight:800;text-transform:uppercase;letter-spacing:.03em;margin-bottom:6px}
.card-link{display:block;transition:transform .14s ease}
.card-link:hover{transform:translateY(-2px)}
.smart-convert{
  display:grid;grid-template-columns:1fr auto;gap:12px;align-items:end
}
label{display:block;font-weight:800;margin-bottom:8px}
input,select,textarea,button{
  font:inherit
}
.input,.select,textarea{
  width:100%;padding:14px 14px;border-radius:14px;border:1px solid #d1d5db;background:#fff;color:var(--text)
}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 16px;border-radius:14px;border:1px solid #111827;background:#111827;color:#fff;font-weight:800;cursor:pointer
}
.btn-secondary{
  background:#fff;color:var(--text);border-color:var(--line)
}
.inline-actions{display:flex;gap:10px;flex-wrap:wrap}
.tool-panel{
  background:var(--panel);border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);padding:22px
}
.tool-grid{display:grid;grid-template-columns:1fr auto 1fr;gap:16px;align-items:end}
.swap{
  width:52px;height:52px;border-radius:16px;border:1px solid var(--line);background:#fff;font-size:1.2rem;font-weight:800;cursor:pointer
}
.result-box{
  margin-top:16px;padding:16px;border-radius:16px;background:var(--soft);border:1px solid var(--line)
}
.result-box strong{font-size:1.15rem}
.muted{color:var(--muted)}
.article p,.article li{color:#334155}
.article h2,.article h3{margin-top:26px}
.list{padding-left:20px;margin:0}
.table-wrap{overflow:auto}
table{width:100%;border-collapse:collapse;font-size:.96rem}
th,td{padding:12px;border-bottom:1px solid var(--line);text-align:left}
.callout{
  padding:16px 18px;border-radius:16px;border:1px solid #dbeafe;background:#eff6ff;color:#1e3a8a
}
.breadcrumbs{font-size:.92rem;color:var(--muted);margin:16px 0 10px}
.breadcrumbs a{color:var(--muted)}
.readmore{font-weight:800;color:#1d4ed8}
.notice{
  margin-top:16px;padding:14px 16px;border-radius:14px;background:#fff7ed;border:1px solid #fed7aa;color:#9a3412
}
.safe-ad-note{
  margin-top:12px;padding:12px 14px;border:1px dashed #cbd5e1;border-radius:14px;color:var(--muted);font-size:.94rem
}
.footer{
  margin-top:34px;padding:28px 0 42px;border-top:1px solid var(--line)
}
.footer-grid{
  display:grid;grid-template-columns:1.6fr .9fr .9fr;gap:18px
}
.footer small,.footer p,.footer li,.footer a{color:var(--muted)}
.footer-links{display:grid;gap:8px}
.cookie{
  position:fixed;left:18px;right:18px;bottom:18px;z-index:70;
  background:#111827;color:#fff;border-radius:18px;box-shadow:0 24px 48px rgba(0,0,0,.25);
  padding:14px 16px;display:none
}
.cookie-inner{display:flex;align-items:center;justify-content:space-between;gap:14px}
.cookie-actions{display:flex;gap:10px;flex-wrap:wrap}
.cookie .btn{padding:10px 14px}
.cookie .btn-secondary{background:#1f2937;color:#fff;border-color:#374151}
@media(max-width:960px){
  .grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:720px){
  .site-header-inner{min-height:unset;padding:12px 0;align-items:flex-start;flex-direction:column}
  .hero h1{font-size:1.9rem}
  .smart-convert,.tool-grid,.grid-4,.grid-3,.grid-2,.footer-grid,.cookie-inner{grid-template-columns:1fr;display:grid}
  .footer-grid{gap:10px}
  .top-nav{width:100%}
  .top-nav a,.mode-toggle{flex:1}
}


/* V6.6.1 layout consistency fixes */
.grid > .card,
.grid > .card-link{
  height:100%;
}
.card-link{
  display:flex;
  flex-direction:column;
  min-height:100%;
}
.card-link h3{
  margin-bottom:10px;
}
.card-link p{
  flex:1;
}
.chips .chip{
  white-space:normal;
  text-align:center;
  line-height:1.25;
}
.section-title{
  align-items:flex-start;
}
.article{
  overflow-wrap:anywhere;
  word-break:normal;
}
.hero-panel .grid .card h3,
.hero-panel .grid .card-link h3,
.section .grid .card h3,
.section .grid .card-link h3{
  line-height:1.2;
}