/*
  Apple-ish visual direction:
  - clean typography
  - softer neutrals + subtle gradients
  - glassy cards with blur
  - refined borders/shadows
  - excellent focus states
*/

:root{
  --bg0:#f5f5f7;
  --bg1:#ffffff;
  --text:#111827;
  --muted:#6b7280;
  --border:rgba(17,24,39,.10);
  --border2:rgba(17,24,39,.14);
  --link:#2563eb;
  --shadow: 0 10px 30px rgba(17,24,39,.10);
  --shadow2: 0 3px 12px rgba(17,24,39,.08);
  --radius:16px;
  --radius2:12px;
  --ring: 0 0 0 4px rgba(37, 99, 235, .18);
  --topbar: rgba(255,255,255,.60);
  --topbar-border: rgba(17,24,39,.10);
}

@media (prefers-color-scheme: dark){
  :root{
    --bg0:#0b0b0f;
    --bg1:#0f1116;
    --text:#f3f4f6;
    --muted:#9ca3af;
    --border:rgba(255,255,255,.10);
    --border2:rgba(255,255,255,.14);
    --link:#7aa2ff;
    --shadow: 0 16px 40px rgba(0,0,0,.55);
    --shadow2: 0 3px 14px rgba(0,0,0,.40);
    --ring: 0 0 0 4px rgba(122, 162, 255, .20);
    --topbar: rgba(15,17,22,.55);
    --topbar-border: rgba(255,255,255,.10);
  }
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}

body{
  font-family: ui-sans-serif, system-ui, -apple-system, "SF Pro Text", "SF Pro Display", "Segoe UI", Roboto, Arial, sans-serif;
  background:
    radial-gradient(1200px 600px at 15% -10%, rgba(37,99,235,.12), transparent 60%),
    radial-gradient(900px 500px at 85% 0%, rgba(16,185,129,.10), transparent 55%),
    linear-gradient(180deg, var(--bg0), var(--bg1));
  color:var(--text);
  line-height:1.60;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.wrap{max-width:980px;margin:0 auto;padding:28px}

/* Top navigation */
.topbar{
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--topbar);
  border-bottom: 1px solid var(--topbar-border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.topbar-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding-top:14px;
  padding-bottom:14px;
}

.brand{
  font-weight:700;
  letter-spacing:-0.02em;
  color: var(--text);
}

.brand:hover{ text-decoration:none; }

.nav{ display:flex; gap:14px; flex-wrap:wrap; justify-content:flex-end; }
.nav a{ color: var(--muted); font-weight:550; }
.nav a:hover{ color: var(--text); text-decoration:none; }

/* Hero + sections */
.hero{ padding: 18px 0 6px 0; }

.section-head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:12px;
  margin-top: 10px;
}

.muted{ color: var(--muted); margin: 0; }

h1{
  margin:0 0 10px 0;
  font-size:44px;
  letter-spacing:-0.02em;
  line-height:1.05;
}

h2{
  margin:26px 0 10px 0;
  font-size:18px;
  letter-spacing:-0.01em;
}

p{margin:10px 0}

.lede{
  color:var(--muted);
  margin:0;
  font-size:16px;
  max-width:70ch;
}

a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}

.footer{
  border-top:1px solid var(--border);
  color:var(--muted);
}

.small{font-size:12px;color:var(--muted)}

.card{
  background: color-mix(in srgb, var(--bg1) 88%, transparent);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  margin: 16px 0;
  box-shadow: var(--shadow2);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

/* Form controls */
.field{ margin: 12px 0; }
.field label{ display:block; font-weight:600; letter-spacing:-0.01em; margin-bottom:6px; }
.help{ color: var(--muted); font-size: 12px; margin-top: 6px; }

.control{
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--border2);
  background: color-mix(in srgb, var(--bg1) 70%, transparent);
  color: var(--text);
  box-shadow: 0 1px 0 rgba(17,24,39,.04);
}

.control:focus{
  outline:none;
  box-shadow: var(--ring);
  border-color: color-mix(in srgb, var(--link) 45%, var(--border2));
}

.row{ display:flex; gap:10px; align-items:center; flex-wrap:wrap; margin-top: 14px; }

.btn{
  appearance:none;
  border: 1px solid var(--border2);
  background: color-mix(in srgb, var(--bg1) 78%, transparent);
  color: var(--text);
  border-radius: 999px;
  padding: 10px 14px;
  font-weight: 650;
  letter-spacing: -0.01em;
  cursor: pointer;
  transition: transform .12s ease, box-shadow .12s ease, border-color .12s ease;
}

.btn:hover{
  transform: translateY(-1px);
  box-shadow: var(--shadow2);
  border-color: color-mix(in srgb, var(--link) 25%, var(--border2));
}

.btn:focus{ outline:none; box-shadow: var(--ring); }

.btn-ghost{
  background: transparent;
}

.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}

/* Featured tiles */
.tiles{
  display:grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 10px 0 6px 0;
}

.tile{
  display:block;
  padding: 16px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg1) 80%, transparent);
  box-shadow: var(--shadow2);
  transition: transform .12s ease, box-shadow .12s ease, border-color .12s ease;
}

.tile:hover{
  transform: translateY(-1px);
  box-shadow: var(--shadow);
  border-color: color-mix(in srgb, var(--link) 25%, var(--border));
  text-decoration:none;
}

.tile-title{ font-weight:700; letter-spacing:-0.01em; color: var(--text); }
.tile-desc{ color: var(--muted); margin-top: 4px; font-size: 13px; }
.tile-cta{ margin-top: 10px; color: var(--link); font-weight:600; font-size: 13px; }

.label{
  color:var(--muted);
  font-size:12px;
  text-transform:uppercase;
  letter-spacing:.10em;
}

.value{
  font-size:22px;
  font-weight:650;
  padding-top:6px;
}

.facts{margin:0;padding-left:18px}

.crumbs{margin-bottom:12px}

.search{
  width:100%;
  padding:12px 14px;
  border-radius: 999px;
  border: 1px solid var(--border2);
  background: color-mix(in srgb, var(--bg1) 70%, transparent);
  color: var(--text);
  box-shadow: 0 1px 0 rgba(17,24,39,.04);
}
.search:focus{
  outline:none;
  box-shadow: var(--ring);
  border-color: color-mix(in srgb, var(--link) 45%, var(--border2));
}

.tool-list{list-style:none;padding:0;margin:12px 0}

.tool-list li{
  padding: 14px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin: 10px 0;
  background: color-mix(in srgb, var(--bg1) 75%, transparent);
  box-shadow: var(--shadow2);
  transition: transform .12s ease, box-shadow .12s ease, border-color .12s ease;
}

.tool-list li:hover{
  transform: translateY(-1px);
  box-shadow: var(--shadow);
  border-color: color-mix(in srgb, var(--link) 25%, var(--border));
}

.meta{display:block;color:var(--muted);font-size:13px;margin-top:4px}

/* Simple charts */
.chart{
  width: 100%;
  height: 180px;
  border-radius: var(--radius2);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg1) 78%, transparent);
  overflow: hidden;
  margin-top: 10px;
}

.legend{ display:flex; flex-wrap:wrap; gap:10px; margin-top:10px; }
.legend-item{ display:flex; gap:8px; align-items:center; font-size: 12px; color: var(--muted); }
.swatch{ width:10px; height:10px; border-radius: 3px; background: var(--border2); border:1px solid var(--border); }

/* nicer details/summary */
details{
  border: 1px solid var(--border);
  border-radius: var(--radius2);
  padding: 12px 14px;
  margin: 10px 0;
  background: color-mix(in srgb, var(--bg1) 78%, transparent);
}

details > summary{
  cursor:pointer;
  font-weight:600;
  letter-spacing:-0.01em;
}

details[open]{
  box-shadow: var(--shadow2);
}

@media (max-width:720px){
  .wrap{padding:20px}
  h1{font-size:34px}
  .grid{grid-template-columns:1fr}
  .tiles{grid-template-columns:1fr}
  .topbar-inner{padding-top:12px;padding-bottom:12px}
}

/* selection */
::selection{background: rgba(37,99,235,.20)}