/* ============================================================
   TOKENS
   ============================================================ */
:root {
  --paper: #E9E5D6;
  --ink: #1B2420;
  --panel: #212B25;
  --panel-2: #283530;
  --brass: #D3A24E;
  --brass-dim: #a5824a;
  --seafoam: #6FA88F;
  --line: rgba(233, 229, 214, 0.16);
  --line-strong: rgba(233, 229, 214, 0.32);

  --font-display: "Space Grotesk", "IBM Plex Sans", sans-serif;
  --font-body: "IBM Plex Sans", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --radius: 3px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  
  background-size: 48px 48px;
  background-attachment: fixed;
}

a { color: var(--brass); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* ============================================================
   LAYOUT SHELL
   ============================================================ */
.wrap { max-width: 900px; margin: 0 auto; padding: 0 24px; }

header.site {
  border-bottom: 1px solid var(--line-strong);
  padding: 22px 0;
}
header.site .wrap { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

.brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  color: var(--paper);
}
.brand .dot { color: var(--brass); }

.brand-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--seafoam);
  opacity: 0.85;
}

nav.crumbs {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--paper);
  opacity: 0.7;
}
nav.crumbs a { color: var(--paper); opacity: 0.85; }

main { padding: 48px 0 72px; }

footer.site {
  border-top: 1px solid var(--line-strong);
  padding: 28px 0 40px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--paper);
  opacity: 0.6;
}
footer.site .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

/* ============================================================
   TICK RULE — signature device (ruler ticks along dividers)
   ============================================================ */
.tickline {
  height: 10px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--line-strong) 0px, var(--line-strong) 1px,
    transparent 1px, transparent 8px
  );
  background-position: bottom;
  background-repeat: repeat-x;
  background-size: 8px 10px;
  opacity: 0.9;
  margin: 6px 0 0;
}
.tickline.major {
  background-image: repeating-linear-gradient(
    90deg,
    var(--brass-dim) 0px, var(--brass-dim) 1px,
    transparent 1px, transparent 40px
  );
  background-size: 40px 10px;
}

/* ============================================================
   HERO
   ============================================================ */
.hero { padding: 8px 0 40px; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--seafoam);
  margin: 0 0 10px;
}
h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.08;
  margin: 0 0 14px;
  color: var(--paper);
}
.lede {
  max-width: 60ch;
  font-size: 1.05rem;
  opacity: 0.85;
}

.readout-strip {
  display: flex;
  gap: 0;
  margin-top: 32px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
}
.readout {
  flex: 1;
  padding: 16px 20px;
  border-right: 1px solid var(--line-strong);
  background: var(--panel);
}
.readout:last-child { border-right: none; }
.readout .num {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  color: var(--brass);
  font-weight: 500;
}
.readout .cap {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.65;
  margin-top: 4px;
}

/* ============================================================
   TOOL GRID (hub page)
   ============================================================ */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin-top: 8px;
}

.card {
  position: relative;
  display: block;
  background: var(--panel);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 20px 20px 18px;
  color: var(--paper);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.card:hover { border-color: var(--brass); transform: translateY(-2px); text-decoration: none; }
.card .tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--seafoam);
}
.card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin: 8px 0 6px;
}
.card p {
  margin: 0;
  font-size: 0.88rem;
  opacity: 0.75;
}
.card .go {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--brass);
}

/* ============================================================
   TOOL PAGE — instrument panel
   ============================================================ */
.panel {
  background: var(--panel);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 28px;
  margin: 28px 0;
}
.panel + .panel { margin-top: 20px; }

.field { margin-bottom: 18px; }
.field:last-child { margin-bottom: 0; }
.field label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--seafoam);
  margin-bottom: 8px;
}
.field input[type="text"],
.field input[type="number"],
.field textarea,
.field select {
  width: 100%;
  background: var(--panel-2);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 1rem;
  padding: 12px 14px;
}
.field textarea { min-height: 160px; resize: vertical; }
.field select { appearance: none; cursor: pointer; }

.row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.row.three { grid-template-columns: 1fr 1fr 1fr; }
@media (max-width: 560px) {
  .row, .row.three { grid-template-columns: 1fr; }
}

/* Gauge readout — the tool signature */
.gauge {
  background: var(--ink);
  border: 1px solid var(--brass-dim);
  border-radius: var(--radius);
  padding: 22px 24px;
  position: relative;
  overflow: hidden;
}
.gauge::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 8px;
  background-image: repeating-linear-gradient(
    90deg, var(--brass-dim) 0px, var(--brass-dim) 1px, transparent 1px, transparent 12px
  );
  opacity: 0.55;
}
.gauge .cap {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--seafoam);
  margin-bottom: 8px;
}
.gauge .value {
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 5vw, 2.6rem);
  color: var(--brass);
  font-weight: 500;
  word-break: break-word;
}
.gauge .sub {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  opacity: 0.65;
  margin-top: 6px;
}

.mini-readouts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-top: 14px;
}
.mini-readouts .m {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 14px;
  background: var(--panel-2);
}
.mini-readouts .m .val {
  font-family: var(--font-mono);
  color: var(--paper);
  font-size: 1.15rem;
}
.mini-readouts .m .lab {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.6;
  margin-top: 3px;
}

/* content / SEO copy blocks */
.copy { max-width: 68ch; }
.copy h2 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin: 40px 0 14px;
}
.copy p { opacity: 0.85; }
.copy ul { opacity: 0.85; padding-left: 20px; }

.ad-slot {
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
  padding: 14px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.4;
  margin: 32px 0;
}

.btn {
  display: inline-block;
  background: var(--brass);
  color: var(--ink);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: 12px 20px;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
}
.btn:hover { background: #e3b666; text-decoration: none; }

/* Type selector (tabs) — used on poly calculator */
.type-select {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 22px;
}
.type-select label {
  display: block;
  cursor: pointer;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 14px 12px;
  text-align: center;
  background: var(--panel-2);
  transition: border-color 0.15s ease, background 0.15s ease;
}
.type-select input { position: absolute; opacity: 0; pointer-events: none; }
.type-select input:checked + label,
.type-select label.checked {
  border-color: var(--brass);
  background: rgba(211, 162, 78, 0.12);
}
.type-select .t-name {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--paper);
}
.type-select .t-desc {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  opacity: 0.6;
  margin-top: 4px;
}
@media (max-width: 560px) {
  .type-select { grid-template-columns: 1fr; }
}

.faq { margin-top: 12px; }
.faq details {
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
}
.faq summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--paper);
}
.faq p { margin: 10px 0 0; opacity: 0.8; }

.formula-box {
  background: var(--panel-2);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--seafoam);
  overflow-x: auto;
  white-space: pre;
}

.back-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  display: inline-block;
  margin-bottom: 18px;
  opacity: 0.75;
}