:root{
  --bg:#f5f7fb;
  --panel:#ffffff;
  --ink:#111827;
  --muted:#667085;
  --line:#d9e2ec;
  --brand:#1d63ed;
  --brand2:#12b3a8;
  --dark:#0f2442;
  --soft:#edf4ff;
  --soft2:#e9fbf8;
  --shadow:0 18px 45px rgba(17,24,39,.08);
  --radius:20px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  color:var(--ink);
  background:
    radial-gradient(circle at 0 0, rgba(29,99,237,.16), transparent 34rem),
    radial-gradient(circle at 100% 10%, rgba(18,179,168,.16), transparent 34rem),
    var(--bg);
}
a{color:inherit;text-decoration:none}
.container{max-width:1220px;margin:0 auto;padding:0 22px}
.site-header{
  position:sticky;top:0;z-index:10;
  background:rgba(255,255,255,.82);
  backdrop-filter:blur(18px);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:16px 0}
.brand{display:flex;align-items:center;gap:12px;font-weight:900}
.logo{
  width:42px;height:42px;border-radius:14px;
  display:grid;place-items:center;color:#fff;
  background:linear-gradient(135deg,var(--brand),var(--brand2));
  box-shadow:0 10px 24px rgba(29,99,237,.25);
}
.nav{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:flex-end}
.nav a{font-size:13px;font-weight:800;color:#3b4a5f;padding:9px 10px;border-radius:999px}
.nav a:hover{background:var(--soft);color:var(--brand)}
.hero{
  margin:28px 0 24px;
  padding:42px;
  color:#fff;
  background:linear-gradient(135deg,#0f2442,#123d70 58%,#0f7c78);
  border-radius:30px;
  box-shadow:var(--shadow);
  position:relative;
  overflow:hidden;
}
.hero:after{
  content:"";position:absolute;right:-110px;top:-100px;
  width:310px;height:310px;border-radius:999px;
  background:rgba(255,255,255,.12)
}
.hero .eyebrow{display:inline-flex;gap:8px;align-items:center;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.18);border-radius:999px;padding:8px 12px;font-weight:900;font-size:12px;letter-spacing:.04em;text-transform:uppercase}
.hero h1{font-size:clamp(34px,6vw,64px);line-height:1.02;margin:18px 0 16px;max-width:920px}
.hero p{font-size:17px;line-height:1.75;color:rgba(255,255,255,.82);max-width:850px;margin:0}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}
.btn{border:0;border-radius:14px;padding:12px 15px;font-weight:900;cursor:pointer;display:inline-flex;align-items:center;gap:8px}
.btn-primary{background:#fff;color:#10233f}
.btn-secondary{background:rgba(255,255,255,.13);color:#fff;border:1px solid rgba(255,255,255,.2)}
.toolbar{
  display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;
  margin:22px 0;
}
.search{flex:1;min-width:260px;position:relative}
.search input{width:100%;border:1px solid var(--line);border-radius:16px;background:#fff;padding:14px 14px 14px 42px;outline:none}
.search span{position:absolute;left:15px;top:13px;color:var(--muted)}
.chips{display:flex;gap:8px;overflow:auto;padding-bottom:4px}
.chips button{border:1px solid var(--line);background:#fff;color:#4a5970;border-radius:999px;padding:10px 13px;font-weight:900;white-space:nowrap;cursor:pointer}
.chips button.active,.chips button:hover{background:var(--brand);border-color:var(--brand);color:#fff}
.category-section{margin:30px 0}
.category-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:14px}
.category-head h2{margin:0;font-size:25px}
.category-head p{margin:6px 0 0;color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(270px,1fr));gap:16px}
.card{
  display:flex;flex-direction:column;gap:12px;
  background:rgba(255,255,255,.94);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:18px;
  box-shadow:var(--shadow);
  transition:transform .15s ease, border-color .15s ease;
}
.card:hover{transform:translateY(-2px);border-color:#b9c8dc}
.card .tag{width:max-content;font-size:12px;font-weight:900;color:var(--brand);background:var(--soft);border-radius:999px;padding:6px 10px}
.card h3{margin:0;font-size:18px;line-height:1.25}
.card p{margin:0;color:var(--muted);font-size:13px;line-height:1.58}
.card a{margin-top:auto;color:#fff;background:linear-gradient(135deg,var(--brand),#0a50c8);font-weight:900;border-radius:12px;padding:11px 13px;text-align:center}
.breadcrumbs{font-size:13px;color:var(--muted);margin:22px 0 10px}
.breadcrumbs a{color:var(--brand);font-weight:800}
.calculator-layout{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:20px;align-items:start}
.panel{
  background:rgba(255,255,255,.95);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:22px;
}
.calculator-title{margin:0 0 10px;font-size:clamp(30px,4vw,48px);line-height:1.05}
.lead{font-size:16px;line-height:1.75;color:var(--muted);margin:0 0 20px}
.formula-box{background:#f8fafc;border:1px dashed #c7d3e2;border-radius:16px;padding:14px;font-size:14px;line-height:1.65;color:#344054;margin:18px 0}
.input-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.field{display:grid;gap:7px}
.field label{font-size:13px;font-weight:900;color:#344054}
.field input,.field select{
  width:100%;border:1px solid var(--line);border-radius:13px;background:#fff;color:var(--ink);padding:12px 13px;outline:none;
}
.field input:focus,.field select:focus{border-color:var(--brand);box-shadow:0 0 0 4px rgba(29,99,237,.1)}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}
.result{
  margin-top:18px;
  background:#0f2442;
  color:#fff;
  border-radius:16px;
  padding:16px;
  min-height:140px;
  white-space:pre-wrap;
  font:14px/1.6 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  overflow:auto;
}
.result .ok{color:#b8f6ef}
.side-card{position:sticky;top:86px}
.side-card h3{margin-top:0}
.side-card ul{padding-left:18px;color:var(--muted);line-height:1.75}
.warning{
  background:#fff8e6;border:1px solid #f3d99a;color:#6b4a00;
  border-radius:16px;padding:13px;font-size:13px;line-height:1.6;margin-top:14px
}
.footer{margin-top:48px;padding:24px 0;color:var(--muted);font-size:13px;line-height:1.7;border-top:1px solid var(--line)}
.hidden{display:none!important}
@media(max-width:900px){
  .calculator-layout{grid-template-columns:1fr}
  .side-card{position:static}
  .input-grid{grid-template-columns:1fr}
  .hero{padding:28px}
}
.language-label{display:flex;align-items:center;gap:8px;font-size:12px;font-weight:900;color:#3b4a5f;white-space:nowrap}
.language-select{border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:999px;padding:9px 12px;font-weight:800;outline:none;cursor:pointer}
.language-select:focus{border-color:var(--brand);box-shadow:0 0 0 4px rgba(29,99,237,.1)}
@media(max-width:900px){.header-inner{align-items:flex-start;flex-direction:column}.nav{justify-content:flex-start}.language-label{width:100%;justify-content:space-between}.language-select{min-width:180px}}


/* SEO chart and FAQ pages */
.chart-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:22px;align-items:start}.content-page{background:var(--panel);border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);padding:26px}.content-page h1{font-size:clamp(32px,4.8vw,54px);line-height:1.05;margin:10px 0 14px}.content-page h2{margin-top:32px;font-size:26px}.content-page h3{margin-top:24px}.content-page p,.content-page li{line-height:1.75;color:#475467}.chart-table{width:100%;border-collapse:separate;border-spacing:0;margin:16px 0 22px;overflow:hidden;border:1px solid var(--line);border-radius:16px;background:#fff}.chart-table th,.chart-table td{padding:10px 12px;border-bottom:1px solid var(--line);border-right:1px solid var(--line);text-align:left;font-size:14px}.chart-table th:last-child,.chart-table td:last-child{border-right:0}.chart-table tr:last-child td{border-bottom:0}.chart-table th{background:#f2f6fb;color:#1d2939;font-weight:850}.chart-table td.num{text-align:right;font-variant-numeric:tabular-nums}.table-wrap{overflow:auto}.seo-note,.source-note{background:#f8fafc;border:1px solid var(--line);border-radius:16px;padding:14px 16px;margin:18px 0;color:#475467;line-height:1.65}.source-note small{display:block;color:#667085}.faq{margin-top:30px}.faq details{border:1px solid var(--line);border-radius:16px;background:#fff;margin:10px 0;padding:14px 16px}.faq summary{cursor:pointer;font-weight:850;color:#1d2939}.faq p{margin:10px 0 0}.mini-calc{display:grid;gap:12px;background:#0f2442;color:#fff;border-radius:18px;padding:18px;margin:18px 0}.mini-calc h3{margin:0;color:#fff}.mini-calc .calc-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}.mini-calc label{display:grid;gap:6px;font-size:12px;font-weight:850;color:#d0d5dd}.mini-calc input,.mini-calc select{border:1px solid rgba(255,255,255,.22);border-radius:12px;background:#fff;color:#101828;padding:10px}.mini-result{white-space:pre-wrap;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.16);border-radius:14px;padding:12px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}.toc-card{position:sticky;top:90px}.toc-card a{display:block;padding:8px 0;color:var(--brand);font-weight:750}.chart-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(270px,1fr));gap:16px;margin-top:18px}.chart-card{border:1px solid var(--line);border-radius:18px;background:#fff;padding:18px;box-shadow:var(--shadow)}.chart-card h3{margin:8px 0 8px}.chart-card p{color:#667085}.pill-list{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0}.pill-list span{background:var(--soft);color:var(--brand);border-radius:999px;padding:6px 10px;font-size:12px;font-weight:850}.static-header{background:rgba(255,255,255,.92);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5;backdrop-filter:blur(12px)}.static-header .container{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:14px 20px}.static-header nav{display:flex;gap:8px;flex-wrap:wrap}.static-header nav a{padding:8px 11px;border-radius:999px;color:#475467;font-weight:750}.static-header nav a:hover{background:var(--soft);color:var(--brand)}.source-list li{font-size:13px;color:#667085}@media(max-width:960px){.chart-layout{grid-template-columns:1fr}.toc-card{position:relative;top:auto}.content-page{padding:20px}.chart-table th,.chart-table td{font-size:13px;white-space:nowrap}}

/* Global footer and static content */
.footer-grid{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:20px;align-items:start}.footer-grid p{margin:.35rem 0 0}.footer-links{display:flex;gap:12px;flex-wrap:wrap;justify-content:flex-end}.footer-links a{font-weight:850;color:var(--brand)}.static-page{margin:28px 0 40px}.static-page section{border-top:1px solid var(--line);padding-top:10px;margin-top:18px}.static-page h2{font-size:22px}.source-badge{display:inline-flex;background:var(--soft2);color:#087443;border-radius:999px;padding:5px 10px;font-weight:850;font-size:12px}@media(max-width:760px){.footer-grid{grid-template-columns:1fr}.footer-links{justify-content:flex-start}.static-header .container{align-items:flex-start;flex-direction:column}}


/* Updated global navigation, dropdown menus, footer copyright, and mobile usability */
html,body{max-width:100%;overflow-x:hidden}.site-header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.94);border-bottom:1px solid var(--line);backdrop-filter:blur(14px)}
.header-inner{min-height:74px}.menu-toggle{display:none;border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:12px;padding:10px 12px;font-weight:900;cursor:pointer}.main-nav{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:flex-end}.main-nav>a,.nav-dropdown-button{font-size:13px;font-weight:850;color:#344054;padding:10px 11px;border-radius:999px;border:0;background:transparent;cursor:pointer}.main-nav>a:hover,.nav-dropdown:hover>.nav-dropdown-button,.nav-dropdown-button:focus{background:var(--soft);color:var(--brand)}.nav-dropdown{position:relative}.dropdown-menu{position:absolute;right:0;top:calc(100% + 12px);min-width:280px;max-height:min(72vh,680px);overflow:auto;padding:12px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 24px 55px rgba(16,35,63,.16);opacity:0;visibility:hidden;transform:translateY(6px);transition:.16s ease;z-index:50}.nav-dropdown:hover>.dropdown-menu,.nav-dropdown:focus-within>.dropdown-menu,.nav-dropdown.open>.dropdown-menu{opacity:1;visibility:visible;transform:translateY(0)}.dropdown-menu a{display:block;padding:8px 10px;border-radius:10px;color:#344054;font-size:13px;line-height:1.35}.dropdown-menu a:hover{background:var(--soft);color:var(--brand)}.mega-menu{width:min(860px,calc(100vw - 32px));display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;right:-120px}.mega-group{padding:8px;border-radius:14px;background:#f8fafc}.mega-group h4{margin:0 0 7px;font-size:12px;color:#667085;text-transform:uppercase;letter-spacing:.035em}.charts-menu{width:min(420px,calc(100vw - 32px))}.copyright{font-size:12px;color:#667085}.footer a:hover{text-decoration:underline}.table-wrap{max-width:100%}.content-page img,.panel img{max-width:100%;height:auto}
@media(max-width:1100px){.mega-menu{grid-template-columns:repeat(3,minmax(0,1fr));right:0}}
@media(max-width:920px){.header-inner{min-height:auto;display:grid!important;grid-template-columns:1fr auto;align-items:center!important;gap:12px;padding:12px 18px}.brand{min-width:0}.brand span:last-child{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.menu-toggle{display:inline-flex;align-items:center;gap:7px}.main-nav{display:none;grid-column:1/-1;width:100%;justify-content:flex-start;align-items:stretch;gap:8px;padding-top:6px}.main-nav.open{display:grid}.main-nav>a,.nav-dropdown-button{width:100%;text-align:left;border:1px solid var(--line);background:#fff;border-radius:12px}.nav-dropdown{width:100%}.dropdown-menu{position:static;display:none;opacity:1;visibility:visible;transform:none;width:100%;max-height:none;margin-top:8px;box-shadow:none;border-radius:14px}.nav-dropdown.open>.dropdown-menu{display:grid}.mega-menu{grid-template-columns:1fr;right:auto;width:100%}.charts-menu{width:100%}.language-label{width:100%;justify-content:space-between;border:1px solid var(--line);background:#fff;border-radius:12px;padding:8px 10px}.language-select{min-width:145px}.hero{margin:18px 0;padding:24px;border-radius:22px}.hero h1{font-size:clamp(30px,10vw,46px)}.toolbar{display:grid;grid-template-columns:1fr}.search{min-width:0}.chips{width:100%;padding-bottom:8px}.grid,.chart-cards{grid-template-columns:1fr}.panel,.content-page{padding:18px;border-radius:18px}.calculator-layout,.chart-layout{gap:14px}.calculator-title,.content-page h1{font-size:clamp(28px,9vw,42px)}.input-grid{grid-template-columns:1fr}.field input,.field select,.search input,.mini-calc input,.mini-calc select{font-size:16px}.actions .btn{flex:1;justify-content:center}.result{font-size:13px;min-height:110px}.footer{margin-top:28px}.footer-grid{gap:12px}.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.footer-links a{background:#fff;border:1px solid var(--line);border-radius:12px;padding:9px 10px;text-align:center}}
@media(max-width:520px){.container{padding:0 14px}.hero-actions{display:grid}.btn{width:100%;justify-content:center}.chart-table th,.chart-table td{font-size:12px;padding:9px 10px}.mini-calc{padding:14px}.footer-links{grid-template-columns:1fr}.breadcrumbs{font-size:12px}.card,.chart-card{padding:16px}}


/* Multilingual/RTL refinements added for Arabic and CJK/Thai localization */
.language-select{min-width:9rem;}
html[dir="rtl"] body{direction:rtl;}
html[dir="rtl"] .header-inner, html[dir="rtl"] .footer-grid, html[dir="rtl"] .calculator-layout{direction:rtl;}
html[dir="rtl"] .brand, html[dir="rtl"] .main-nav, html[dir="rtl"] .footer-links{direction:rtl;}
html[dir="rtl"] .breadcrumbs, html[dir="rtl"] .content-page, html[dir="rtl"] .card, html[dir="rtl"] .chart-card{text-align:right;}
html[dir="rtl"] .formula-box, html[dir="rtl"] .result, html[dir="rtl"] .chart-table, html[dir="rtl"] .mini-calc, html[dir="rtl"] code, html[dir="rtl"] pre{direction:ltr;text-align:left;unicode-bidi:plaintext;}
html[lang="ja"] body, html[lang="ko"] body, html[lang="th"] body, html[lang="zh-Hant"] body{line-height:1.75;}