/* TradeStack design system
   Palette: warm orange (trades) on a neutral slate base.
   Single stylesheet, no external fonts, dark mode via prefers-color-scheme. */

:root {
  --bg: #ffffff;
  --bg-soft: #f7f8fb;
  --bg-tint: #fff6ef;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #5b6478;
  --border: #e5e8ef;
  --border-strong: #d3d9e4;
  --accent: #c2410c;
  --accent-dark: #9a3412;
  --accent-soft: #fff1e7;
  --pass: #047857;
  --pass-soft: #e6f6f0;
  --fail: #b91c1c;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, .05);
  --shadow-md: 0 10px 24px -12px rgba(16, 24, 40, .22), 0 2px 6px -2px rgba(16, 24, 40, .06);
  --maxw: 1040px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1120;
    --bg-soft: #101827;
    --bg-tint: #1a1410;
    --surface: #131c2e;
    --text: #e9edf6;
    --muted: #9aa6bd;
    --border: #232d42;
    --border-strong: #33405a;
    --accent: #fb923c;
    --accent-dark: #fdba74;
    --accent-soft: #2a1a11;
    --pass: #34d399;
    --pass-soft: #0f2b23;
    --fail: #f87171;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);
    --shadow-md: 0 12px 28px -14px rgba(0, 0, 0, .7);
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16.5px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------------------------------------------------------------- header */

.site-header {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  border-bottom: 1px solid var(--border);
}
@supports (backdrop-filter: blur(8px)) or (-webkit-backdrop-filter: blur(8px)) {
  .site-header {
    background: color-mix(in srgb, var(--bg) 78%, transparent);
    -webkit-backdrop-filter: saturate(180%) blur(10px);
    backdrop-filter: saturate(180%) blur(10px);
  }
}
@supports not (background: color-mix(in srgb, red 50%, blue)) {
  .site-header { background: var(--bg); }
}

.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: 64px; flex-wrap: wrap;
}

.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 800; font-size: 18px; letter-spacing: -0.02em; color: var(--text);
}
.brand::before {
  content: ""; width: 22px; height: 22px; border-radius: 7px; flex: none;
  background: linear-gradient(135deg, var(--accent), #f59e0b);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .25);
}
.brand:hover { text-decoration: none; }

.site-nav { display: flex; gap: 4px; font-size: 14.5px; flex-wrap: wrap; }
.site-nav a {
  color: var(--muted); padding: 7px 11px; border-radius: 8px;
  transition: background .15s, color .15s;
}
.site-nav a:hover { background: var(--bg-soft); color: var(--text); text-decoration: none; }

/* ------------------------------------------------------------------ hero */

.hero {
  padding: 60px 0 52px;
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(900px 340px at 8% -20%, var(--accent-soft), transparent 70%),
    linear-gradient(180deg, var(--bg-soft), var(--bg));
}
.hero h1 {
  font-size: clamp(30px, 4.4vw, 42px); line-height: 1.15;
  margin: 0 0 14px; letter-spacing: -0.03em; font-weight: 800; max-width: 22ch;
}
.hero .lead { color: var(--muted); font-size: 18px; margin: 0 0 22px; max-width: 62ch; }

.hero-meta {
  display: flex; flex-wrap: wrap; gap: 10px 28px;
  margin: 0 0 26px; font-size: 14.5px; color: var(--muted);
}
.hero-meta span { display: inline-flex; align-items: baseline; gap: 6px; }
.hero-meta b { font-size: 19px; color: var(--text); font-weight: 700; letter-spacing: -0.01em; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 0; }

/* ----------------------------------------------------------------- content */

main.page { padding: 40px 0 20px; }
main.page h1 {
  font-size: clamp(27px, 3.4vw, 34px); line-height: 1.2; font-weight: 800;
  margin: 0 0 12px; letter-spacing: -0.025em;
}
main.page h2 {
  font-size: 22px; font-weight: 700; margin: 44px 0 16px;
  letter-spacing: -0.015em; scroll-margin-top: 88px;
}
main.page p { margin: 0 0 15px; }
main.page ul:not([class]) { margin: 0 0 16px; padding-left: 22px; }
.lede { font-size: 18px; color: var(--muted); margin-bottom: 24px; max-width: 68ch; }

.breadcrumb { font-size: 13.5px; color: var(--muted); margin-bottom: 18px; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--accent); text-decoration: none; }

/* ------------------------------------------------------------- link cards */

.cards {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(258px, 1fr));
  gap: 16px; margin: 0 0 32px; padding: 0; list-style: none;
}
.cards li { margin: 0; }
.cards a {
  position: relative; display: block; height: 100%;
  padding: 18px 46px 18px 18px;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); color: var(--text);
  font-weight: 700; font-size: 16px; letter-spacing: -0.01em;
  box-shadow: var(--shadow-sm);
  transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease;
}
.cards a::after {
  content: "\2192"; position: absolute; top: 15px; right: 16px;
  font-size: 17px; color: var(--accent); opacity: .55;
  transition: transform .16s ease, opacity .16s ease;
}
.cards a:hover {
  transform: translateY(-2px); border-color: var(--border-strong);
  box-shadow: var(--shadow-md); text-decoration: none;
}
.cards a:hover::after { transform: translateX(3px); opacity: 1; }
.cards a span {
  display: block; font-weight: 400; font-size: 14px;
  color: var(--muted); margin-top: 5px; line-height: 1.5;
}
.cards a span:last-child {
  margin-top: 9px; font-size: 12.5px; font-weight: 600; color: var(--accent);
}

/* ------------------------------------------------------------- tool cards */

.tool-list {
  list-style: none; margin: 0 0 32px; padding: 0;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px;
}
.tool-list li {
  position: relative; padding: 18px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease;
}
.tool-list li:hover {
  transform: translateY(-2px); border-color: var(--border-strong); box-shadow: var(--shadow-md);
}
.tool-list h3 { margin: 0 0 6px; font-size: 17.5px; letter-spacing: -0.01em; }
.tool-list h3 a { color: var(--text); }
.tool-list li:hover h3 a { color: var(--accent); text-decoration: none; }
/* full-card click target */
.tool-list h3 a::after { content: ""; position: absolute; inset: 0; border-radius: var(--radius); }
.tool-list p { margin: 0 0 12px; color: var(--muted); font-size: 14.5px; }
.tool-list.small h3 { font-size: 16px; }

/* ------------------------------------------------------------------- tags */

.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: auto; }
.tag {
  font-size: 12px; padding: 4px 10px; border-radius: 999px; font-weight: 500;
  background: var(--bg-soft); color: var(--muted); border: 1px solid var(--border);
}
.tag.free { background: var(--pass-soft); color: var(--pass); border-color: transparent; font-weight: 600; }
.tag.price { background: var(--accent-soft); color: var(--accent-dark); border-color: transparent; font-weight: 600; }

/* ------------------------------------------------------------------ facts */

table.facts {
  width: 100%; border-collapse: separate; border-spacing: 0; margin: 0 0 24px;
  font-size: 15px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow-sm);
}
table.facts th, table.facts td {
  text-align: left; padding: 13px 16px; border-bottom: 1px solid var(--border); vertical-align: top;
}
table.facts th {
  width: 148px; background: var(--bg-soft); font-weight: 600;
  color: var(--muted); font-size: 14px;
}
table.facts tr:last-child th, table.facts tr:last-child td { border-bottom: 0; }

/* ---------------------------------------------------------------- buttons */

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px; background: var(--accent); color: #fff;
  border-radius: var(--radius-sm); font-weight: 600; font-size: 15px;
  box-shadow: var(--shadow-sm);
  transition: background .15s, transform .15s, box-shadow .15s;
}
.btn:hover { background: var(--accent-dark); transform: translateY(-1px); box-shadow: var(--shadow-md); text-decoration: none; }
.btn-ghost {
  background: transparent; color: var(--text);
  border: 1px solid var(--border-strong); box-shadow: none;
}
.btn-ghost:hover { background: var(--bg-soft); color: var(--text); }

/* ---------------------------------------------------------- pros and cons */

ul.pros, ul.cons { list-style: none; margin: 0 0 20px; padding: 0; }
ul.pros li, ul.cons li { position: relative; padding-left: 26px; margin-bottom: 8px; }
ul.pros li::before {
  content: "\2713"; position: absolute; left: 0; top: 0;
  color: var(--pass); font-weight: 700;
}
ul.cons li::before {
  content: "\2715"; position: absolute; left: 0; top: 1px;
  color: var(--fail); font-weight: 700; font-size: 13px;
}

/* ------------------------------------------------------------------- note */

.note {
  border: 1px solid var(--border); border-left: 3px solid var(--accent);
  background: var(--bg-tint);
  padding: 16px 18px; margin: 0 0 26px; font-size: 15.5px;
  border-radius: var(--radius-sm); box-shadow: var(--shadow-sm);
}
.note strong { display: block; margin-bottom: 3px; }

.disclaimer {
  font-size: 13.5px; color: var(--muted); margin-top: 32px;
  border-top: 1px solid var(--border); padding-top: 16px;
}

/* ---------------------------------------------------------------- filters */

.filter-bar { display: flex; align-items: center; gap: 12px; margin: 0 0 16px; }
.filter-bar input {
  flex: 1 1 260px; max-width: 380px; padding: 11px 14px;
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--text); font-size: 15px;
  font-family: inherit; transition: border-color .15s, box-shadow .15s;
}
.filter-bar input::placeholder { color: var(--muted); }
.filter-bar input:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft);
}
.filter-count { font-size: 13.5px; color: var(--muted); }
.filter-empty { font-size: 15px; color: var(--muted); margin: 0 0 28px; }

/* ------------------------------------------------------------- comparison */

.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 0 0 30px; }
table.compare {
  width: 100%; border-collapse: separate; border-spacing: 0; margin: 0;
  min-width: 560px; font-size: 14.5px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow-sm);
}
table.compare th, table.compare td {
  text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--border); vertical-align: top;
}
table.compare thead th {
  background: var(--bg-soft); font-size: 12.5px; text-transform: uppercase;
  letter-spacing: .05em; color: var(--muted);
}
table.compare tbody tr:last-child td { border-bottom: 0; }
table.compare tbody tr:hover { background: var(--bg-soft); }
table.compare td:first-child { font-weight: 600; }

/* -------------------------------------------------------------------- faq */

.faq {
  margin: 0 0 32px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); overflow: hidden; box-shadow: var(--shadow-sm);
}
.faq-item { border-bottom: 1px solid var(--border); }
.faq-item:last-child { border-bottom: 0; }
.faq-item summary {
  cursor: pointer; position: relative; list-style: none;
  padding: 15px 46px 15px 18px; font-weight: 600; font-size: 16px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; position: absolute; right: 18px; top: 12px;
  font-size: 20px; font-weight: 700; color: var(--accent);
}
.faq-item[open] summary::after { content: "\2013"; }
.faq-item summary:hover { background: var(--bg-soft); }
.faq-item .faq-a { margin: 0; padding: 0 18px 16px; color: var(--muted); font-size: 15px; }

/* -------------------------------------------------------------------- ads */

.ad-slot { margin: 28px auto; min-height: 0; text-align: center; }
.ad-slot:empty { display: none; }

/* ----------------------------------------------------------------- footer */

.site-footer {
  margin-top: 64px; border-top: 1px solid var(--border);
  background: var(--bg-soft); padding: 34px 0 48px; font-size: 14.5px; color: var(--muted);
}
.site-footer .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.site-footer nav { display: flex; gap: 18px; flex-wrap: wrap; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--accent); text-decoration: none; }

/* ------------------------------------------------------------- responsive */

@media (max-width: 720px) {
  body { font-size: 16px; }
  .wrap { padding: 0 18px; }
  .hero { padding: 44px 0 38px; }
  .hero h1 { max-width: none; }
  .hero-actions .btn { flex: 1 1 auto; justify-content: center; }
  table.facts th { width: 108px; }
  .tool-list { grid-template-columns: 1fr; }
  .site-header { position: static; }
  main.page h2 { scroll-margin-top: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}