:root {
  --bg: #0d1117;
  --bg-grid-line: rgba(255,255,255,0.045);
  --panel: #151b23;
  --panel-2: #1b232d;
  --border: #2a3441;
  --text: #eef2f6;
  --muted: #8a96a3;
  --accent: #c9ff4d;      /* acid lime — primary */
  --accent-ink: #0d1117;  /* text color on top of accent */
  --blue: #5fb4ff;
  --coral: #ff7a59;
  --radius: 4px;
  --max-width: 960px;
  --mono: "JetBrains Mono", "SF Mono", Consolas, monospace;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
}

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

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

/* Blueprint grid backdrop, used on hero + footer bands */
.grid-band {
  background-image:
    linear-gradient(var(--bg-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid-line) 1px, transparent 1px);
  background-size: 28px 28px;
  background-color: var(--bg);
}

/* Header */
header.site-header {
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
  position: sticky;
  top: 0;
  background: rgba(13,17,23,0.92);
  backdrop-filter: blur(6px);
  z-index: 10;
}
header.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}
a.logo {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}
a.logo::before {
  content: "";
  width: 10px;
  height: 10px;
  background: var(--accent);
  display: inline-block;
  transform: rotate(45deg);
}
a.logo span { color: var(--accent); }
a.logo:hover { text-decoration: none; }

nav.site-nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 22px;
  font-size: 0.88rem;
  font-family: var(--mono);
  letter-spacing: 0.01em;
  border-bottom: 2px solid transparent;
  padding-bottom: 4px;
}
nav.site-nav a:hover {
  color: var(--text);
  border-bottom-color: var(--accent);
}

/* Ad slots */
.ad-slot {
  border: 1px dashed var(--border);
  color: var(--muted);
  font-size: 0.78rem;
  font-family: var(--mono);
  text-align: center;
  padding: 14px;
  margin: 28px 0;
}
.ad-slot.leaderboard { min-height: 90px; display: flex; align-items: center; justify-content: center; }
.ad-slot.in-content { min-height: 90px; display: flex; align-items: center; justify-content: center; }

/* Hero */
.hero {
  padding: 56px 0 40px;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 30px;
  align-items: center;
}
.hero .eyebrow {
  font-family: var(--mono);
  color: var(--accent);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 10px;
}
.hero h1 {
  font-size: 2.1rem;
  margin: 0 0 12px;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.hero p.lead {
  color: var(--muted);
  font-size: 1.02rem;
  max-width: 520px;
}
.hero-art {
  display: flex;
  justify-content: center;
  align-items: center;
}
.hero-art svg { width: 100%; height: auto; max-width: 320px; }

@media (max-width: 720px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-art { order: -1; }
  .hero-art svg { max-width: 220px; }
}

/* Tool grid */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin: 28px 0;
}
.tool-card {
  background: var(--panel);
  padding: 22px;
  text-decoration: none;
  color: var(--text);
  display: block;
  position: relative;
  transition: background .15s ease;
}
.tool-card:hover { background: var(--panel-2); text-decoration: none; }
.tool-card .tag {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 8px;
}
.tool-card h3 {
  margin: 0 0 6px;
  font-size: 1.05rem;
}
.tool-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}
.tool-card .arrow {
  position: absolute;
  top: 20px;
  right: 20px;
  color: var(--muted);
  font-family: var(--mono);
}

/* Calculator panel */
.calc-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  padding: 28px;
  margin: 24px 0 32px;
}
.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 18px;
  margin-bottom: 20px;
}
.field label {
  display: block;
  font-family: var(--mono);
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}
.field input, .field select {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  border-radius: var(--radius);
  font-family: var(--mono);
}
.field input:focus, .field select:focus {
  outline: none;
  border-color: var(--accent);
}

.btn {
  background: var(--accent);
  color: var(--accent-ink);
  border: none;
  padding: 13px 26px;
  font-size: 0.95rem;
  font-weight: 700;
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  cursor: pointer;
  border-radius: var(--radius);
}
.btn:hover { background: #ddffa0; }

.result-box {
  margin-top: 22px;
  padding: 20px 22px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  display: none;
}
.result-box.visible { display: block; }
.result-box .headline {
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--accent);
  margin: 0 0 4px;
  font-family: var(--mono);
}
.result-box .sub {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0;
}
.result-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 16px;
  font-size: 0.92rem;
  font-family: var(--mono);
}
.result-table td {
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
}
.result-table td:last-child {
  text-align: right;
  font-weight: 600;
  color: var(--text);
}

/* Content sections */
.content-block {
  margin: 36px 0;
}
.content-block h2 {
  font-size: 1.2rem;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
}
.faq dt {
  font-weight: 600;
  margin-top: 16px;
  color: var(--text);
}
.faq dd {
  margin: 5px 0 0;
  color: var(--muted);
}

/* Footer */
footer.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 60px;
  padding: 34px 0 54px;
  color: var(--muted);
  font-size: 0.85rem;
}
footer.site-footer nav a {
  color: var(--muted);
  margin-right: 18px;
  text-decoration: none;
  font-family: var(--mono);
  font-size: 0.82rem;
}
footer.site-footer nav a:hover { color: var(--accent); text-decoration: none; }

.breadcrumb {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 18px 0 0;
  font-family: var(--mono);
}
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--accent); }

@media (max-width: 600px) {
  .hero h1 { font-size: 1.6rem; }
  nav.site-nav a { margin-left: 14px; font-size: 0.78rem; }
}