:root{
  --bg:#f8fafc;
  --surface:#ffffff;
  --surface-2:#eef2ff;
  --surface-3:#f1f5f9;
  --text:#0f172a;
  --muted:#475569;
  --line:#e2e8f0;
  --brand:#4f46e5;
  --brand-2:#7c3aed;
  --shadow:0 18px 48px rgba(15,23,42,.08);
  --radius:22px;
  --radius-sm:16px;
  --container:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;
  background:linear-gradient(180deg,#f8fafc 0%,#ffffff 28%,#f8fafc 100%);
  color:var(--text);
  line-height:1.65;
}
img{max-width:100%;display:block}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.container{width:min(calc(100% - 32px),var(--container));margin-inline:auto}
.site-header{
  position:sticky;top:0;z-index:40;
  background:rgba(248,250,252,.88);
  backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(226,232,240,.9);
}
.header-wrap{
  min-height:76px;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.brand{
  display:flex;align-items:center;gap:14px;
  color:var(--text);text-decoration:none;
}
.brand:hover{text-decoration:none}
.brand-mark{
  width:44px;height:44px;border-radius:14px;
  display:grid;place-items:center;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  color:#fff;font-weight:800;font-size:1.05rem;
  box-shadow:0 10px 24px rgba(79,70,229,.3);
}
.brand strong{display:block;font-size:1rem}
.brand small{display:block;color:var(--muted);font-size:.82rem}
.main-nav{display:flex;align-items:center;gap:20px}
.main-nav a{
  color:var(--muted);font-weight:650;padding:10px 14px;border-radius:999px;
}
.main-nav a:hover,.main-nav a.is-active{
  color:var(--text);
  text-decoration:none;
  background:rgba(99,102,241,.08);
}
.nav-toggle{
  display:none;border:0;background:transparent;padding:10px;cursor:pointer
}
.nav-toggle span{
  display:block;width:22px;height:2px;background:var(--text);margin:4px 0;border-radius:99px
}
.hero{
  padding:56px 0 28px;
}
.hero-grid{
  display:grid;grid-template-columns:1.12fr .88fr;gap:26px;align-items:stretch
}
.card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.hero-card{
  padding:36px;
  background:
    radial-gradient(circle at top right,rgba(124,58,237,.14),transparent 28%),
    radial-gradient(circle at left bottom,rgba(79,70,229,.12),transparent 26%),
    var(--surface);
}
.eyebrow, .badge, .pill{
  display:inline-flex;align-items:center;gap:10px;
  padding:8px 12px;border-radius:999px;
  background:rgba(79,70,229,.08);
  color:var(--brand);font-weight:700;font-size:.83rem
}
.hero h1{
  margin:16px 0 12px;font-size:clamp(2rem,4vw,3.8rem);line-height:1.05;letter-spacing:-.03em
}
.hero p.lead{
  margin:0 0 20px;color:var(--muted);font-size:1.08rem;max-width:62ch
}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0 24px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:48px;padding:0 18px;border-radius:14px;border:1px solid transparent;
  font-weight:750;text-decoration:none;cursor:pointer;transition:.18s ease;
  font:inherit;
}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{
  background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;
  box-shadow:0 16px 30px rgba(79,70,229,.25)
}
.btn-secondary{background:#fff;border-color:var(--line);color:var(--text)}
.btn-ghost{background:#f8fafc;border-color:var(--line);color:var(--text)}
.inline-stats{
  display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:24px
}
.inline-stats .stat{
  border:1px solid var(--line);border-radius:18px;padding:16px;background:rgba(255,255,255,.72)
}
.stat strong{display:block;font-size:1.15rem}
.stat span{color:var(--muted);font-size:.92rem}
.hero-side{padding:28px;display:flex;flex-direction:column;gap:18px}
.mini-list{display:grid;gap:14px}
.mini-item{padding:16px;border-radius:18px;border:1px solid var(--line);background:#fff}
.mini-item strong{display:block}
.mini-item p{margin:8px 0 0;color:var(--muted)}
.quick-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.quick-links a{
  display:block;padding:14px 16px;border-radius:16px;background:#fff;border:1px solid var(--line);color:var(--text)
}
.quick-links a:hover{text-decoration:none;border-color:#c7d2fe}
.section{padding:30px 0}
.section-lg{padding:42px 0}
.section-head{
  display:flex;justify-content:space-between;gap:18px;align-items:end;margin-bottom:18px
}
.section-head h2,.page-head h1{margin:0;line-height:1.08;letter-spacing:-.02em}
.section-head p,.page-head p{margin:10px 0 0;color:var(--muted);max-width:70ch}
.section-kicker{color:var(--brand);font-weight:700;font-size:.86rem;margin-bottom:8px;display:block}
.tool-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.tool-card{padding:22px;display:flex;flex-direction:column;gap:12px;min-height:100%}
.tool-card .icon{font-size:1.5rem}
.tool-card h3{margin:0;font-size:1.2rem}
.tool-card p{margin:0;color:var(--muted)}
.tool-card .meta{display:flex;flex-wrap:wrap;gap:10px;margin-top:auto;padding-top:6px}
.pill{background:#f1f5f9;color:#334155;font-size:.82rem}
.feature-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}
.feature-card,.compare-card,.category-card,.journey-card{padding:22px}
.feature-card h3,.compare-card h3,.category-card h3,.journey-card h3{margin:0 0 8px}
.feature-card p,.compare-card p,.category-card p,.journey-card p{margin:0;color:var(--muted)}
.page-hero{padding:36px 0 18px}
.page-head{padding:28px;border-radius:var(--radius);background:#fff;border:1px solid var(--line);box-shadow:var(--shadow)}
.breadcrumbs{display:flex;gap:10px;flex-wrap:wrap;font-size:.92rem;color:var(--muted);margin-bottom:12px}
.breadcrumbs a{color:var(--muted)}
.layout-2col{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(300px,.55fr);gap:20px;align-items:start}
.sticky-col{position:sticky;top:94px}
.calculator-card,.content-card,.sidebar-card,.toc{padding:24px}
.content-card + .content-card,.sidebar-card + .sidebar-card,.calculator-card + .content-card,.toc + .content-card{margin-top:18px}
.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.form-field{display:flex;flex-direction:column;gap:8px}
.form-field label{font-weight:700}
.form-field input,.form-field select{
  width:100%;min-height:48px;padding:12px 14px;border-radius:14px;border:1px solid #cbd5e1;
  background:#fff;font:inherit;color:var(--text)
}
.form-field small{color:var(--muted)}
.form-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:18px}
.result-card{
  margin-top:18px;padding:20px;border-radius:18px;border:1px solid #c7d2fe;background:linear-gradient(180deg,#f8faff 0%,#eef2ff 100%)
}
.result-card h3{margin:0 0 10px;font-size:1.1rem}
.result-big{font-size:clamp(1.8rem,4vw,2.6rem);font-weight:800;line-height:1.05;letter-spacing:-.03em}
.result-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:14px}
.result-item{background:#fff;border:1px solid rgba(99,102,241,.16);padding:14px;border-radius:16px}
.result-item strong{display:block;font-size:1.06rem}
.result-item span{display:block;color:var(--muted);font-size:.9rem}
.progress{margin-top:14px;background:#dbeafe;border-radius:999px;height:14px;overflow:hidden}
.progress > span{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,var(--brand),var(--brand-2))}
.note{margin-top:14px;padding:13px 14px;border-radius:14px;background:#fff;border:1px dashed #cbd5e1;color:var(--muted)}
.stack,.recent-list,.related-list,.guide-list,.toc-links,.chip-row,.answer-list,.hub-list{display:grid;gap:12px}
.link-card{
  padding:14px 16px;border-radius:16px;border:1px solid var(--line);background:#fff;color:var(--text);display:block
}
.link-card:hover{text-decoration:none;border-color:#c7d2fe;transform:translateY(-1px)}
.link-card small{display:block;color:var(--muted);margin-top:4px}
.faq details{border:1px solid var(--line);background:#fff;border-radius:16px;padding:16px 18px}
.faq details + details{margin-top:12px}
.faq summary{cursor:pointer;font-weight:800}
.faq p{color:var(--muted);margin:12px 0 0}
.metric-list{display:grid;gap:12px;margin:0;padding:0;list-style:none}
.metric-list li{padding:14px;border-radius:16px;background:#fff;border:1px solid var(--line)}
.metric-list strong{display:block}
.guide-content h2{line-height:1.15;margin:30px 0 10px}
.guide-content h3{line-height:1.18}
.guide-content p,.guide-content li{color:#1e293b}
.guide-content ul,.guide-content ol{padding-left:20px}
.article-section + .article-section{margin-top:10px}
.compare-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.cta-band{
  padding:26px;border-radius:var(--radius);background:linear-gradient(135deg,#111827,#1e1b4b);color:#fff;
  display:flex;justify-content:space-between;align-items:center;gap:18px
}
.cta-band p{margin:6px 0 0;color:rgba(255,255,255,.8)}
.cta-band .btn-secondary{background:rgba(255,255,255,.08);color:#fff;border-color:rgba(255,255,255,.14)}
.site-footer{margin-top:52px;padding:44px 0 0;border-top:1px solid var(--line);background:#fff}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:22px}
.site-footer h3{margin:0 0 12px;font-size:1rem}
.site-footer p,.site-footer li{color:var(--muted)}
.site-footer ul{list-style:none;padding:0;margin:0;display:grid;gap:8px}
.footer-bottom{padding:20px 0 28px;color:var(--muted)}
.hero-points{display:grid;gap:10px;margin:22px 0 0;padding:0;list-style:none}
.hero-points li{padding:12px 14px;border-radius:16px;background:#fff;border:1px solid var(--line)}
.copy-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
.toast{
  position:fixed;right:18px;bottom:18px;background:#111827;color:#fff;padding:12px 14px;border-radius:14px;
  box-shadow:var(--shadow);opacity:0;transform:translateY(10px);transition:.2s;pointer-events:none;z-index:60
}
.toast.is-visible{opacity:1;transform:translateY(0)}
.table-like{display:grid;gap:10px;margin-top:12px}
.table-row{
  display:grid;grid-template-columns:1fr auto;gap:10px;padding:12px 14px;border-radius:16px;border:1px solid var(--line);background:#fff
}
.table-row span{color:var(--muted)}
.muted{color:var(--muted)}
.center{text-align:center}
.hide{display:none!important}
.search-card{padding:20px}
.search-bar{
  display:flex;align-items:center;gap:10px;
  padding:12px 14px;border:1px solid var(--line);background:#fff;border-radius:16px
}
.search-bar input{
  flex:1;border:0;outline:0;background:transparent;font:inherit;color:var(--text)
}
.filter-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.filter-card{
  padding:22px;border-radius:22px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow)
}
.filter-card.is-hidden{display:none}
.filter-card h3{margin:0 0 8px}
.filter-card p{margin:0;color:var(--muted)}
.category-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.category-card ul{padding-left:18px;margin:10px 0 0}
.answer-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.answer-card{padding:22px}
.answer-card h3{margin:0 0 8px}
.answer-card p{margin:0;color:var(--muted)}
.journey-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}
.topic-band{
  padding:24px;border-radius:var(--radius);background:linear-gradient(135deg,#eff6ff,#f5f3ff);border:1px solid #c7d2fe
}
.callout{
  padding:16px 18px;border-radius:18px;border:1px solid #c7d2fe;background:#f8faff
}
.callout p:last-child{margin-bottom:0}
.callout strong{display:block;margin-bottom:6px}
.stats-strip{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;margin-top:18px
}
.stats-strip .item{
  padding:16px;border-radius:18px;background:#fff;border:1px solid var(--line)
}
.stats-strip strong{display:block;font-size:1.1rem}
.path-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.path-card{padding:22px}
.path-card ul{margin:10px 0 0;padding-left:18px}
.about-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:20px}
.legal-copy h2{margin-top:28px}
@media (max-width:980px){
  .hero-grid,.layout-2col,.footer-grid,.feature-grid,.tool-grid,.compare-grid,.filter-grid,.category-grid,.answer-grid,.journey-grid,.stats-strip,.path-grid,.about-grid{grid-template-columns:1fr}
  .inline-stats,.quick-links{grid-template-columns:1fr}
  .sticky-col{position:static}
}
@media (max-width:760px){
  .main-nav{
    position:absolute;left:16px;right:16px;top:74px;display:none;flex-direction:column;align-items:stretch;
    background:#fff;padding:14px;border-radius:18px;border:1px solid var(--line);box-shadow:var(--shadow)
  }
  .main-nav.is-open{display:flex}
  .nav-toggle{display:block}
  .hero{padding-top:28px}
  .hero-card,.hero-side,.page-head,.calculator-card,.content-card,.sidebar-card,.feature-card,.tool-card,.compare-card,.search-card,.filter-card,.category-card,.answer-card,.journey-card,.path-card,.toc{padding:20px}
  .form-grid,.result-grid{grid-template-columns:1fr}
  .section-head{flex-direction:column;align-items:start}
}