/* ============================================================
   Difftronic — shared stylesheet
   Palette: navy / paper / graphite / brass
   Type: Roboto Mono (headings), Roboto (body)
   ============================================================ */

:root {
  --paper: #ded8c2;             /* muted drafting paper — page background */
  --paper-deep: #d3ccb2;        /* slightly deeper paper, for subtle zones */
  --navy: #1e3a52;              /* blueprint navy — headings, rules, the one block */
  --navy-deep: #16283a;
  --brass: #a8672e;             /* the one accent — links, buttons */
  --brass-bright: #c17b3a;

  --ink: #2b2924;               /* graphite — body copy */
  --ink-muted: rgba(43, 41, 36, 0.64);
  --paper-muted: rgba(222, 216, 194, 0.68);
  --line: rgba(30, 58, 82, 0.22);       /* navy-tinted hairline, on paper */
  --line-soft: rgba(30, 58, 82, 0.12);
  --line-on-navy: rgba(222, 216, 194, 0.22);

  --font-mono: "Roboto Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  --font-body: "Roboto", -apple-system, "Segoe UI", sans-serif;

  --max-width: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--brass); color: var(--paper); }

a { color: inherit; text-decoration: none; }
p a { text-decoration: underline; text-decoration-color: var(--brass); text-underline-offset: 3px; }

h1, h2, h3, h4 {
  font-family: var(--font-mono);
  font-weight: 500;
  line-height: 1.15;
  color: var(--navy);
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

p { margin: 0 0 1em; color: var(--ink-muted); }
p.lede { color: var(--ink); }

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

/* ---------- section divider ---------- */
.rule-double {
  height: 6px;
  border-top: 2px solid var(--navy);
  border-bottom: 1px solid var(--line);
}

/* ---------- the one bold block ---------- */
.block-navy { background: var(--navy); color: var(--paper-muted); }
.block-navy h1, .block-navy h2, .block-navy h3 { color: var(--paper); }
.block-navy p.lede { color: var(--paper-muted); }
.block-navy a:not(.btn) { text-decoration-color: var(--brass-bright); }
.block-navy .spec-list { border-top-color: var(--line-on-navy); }
.block-navy .spec-row { border-bottom-color: var(--line-on-navy); }
.block-navy .spec-row .term { color: var(--paper); }
.block-navy .spec-row .desc { color: var(--paper-muted); }

/* ---------- nav ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--paper);
  border-bottom: 2px solid var(--navy);
}
.site-nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 16px;
  color: var(--navy);
}
.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 4px;
  background: var(--navy);
  color: var(--paper);
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  flex-shrink: 0;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  font-family: var(--font-mono);
  font-size: 13.5px;
}
.nav-links a { color: var(--ink-muted); }
.nav-links a:hover, .nav-links a.active { color: var(--navy); }
.nav-links a.nav-cta {
  color: var(--navy);
  border: 1px solid var(--navy);
  padding: 7px 15px;
}
.nav-links a.nav-cta:hover { background: var(--navy); color: var(--paper); }
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--navy);
  color: var(--navy);
  width: 38px; height: 38px;
  font-family: var(--font-mono);
  font-size: 18px;
}

@media (max-width: 760px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 68px; left: 0; right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--paper);
    border-bottom: 2px solid var(--navy);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }
  .nav-links.open { max-height: 360px; }
  .nav-links a { width: 100%; padding: 15px 32px; border-top: 1px solid var(--line-soft); }
  .nav-links a.nav-cta { border: none; border-top: 1px solid var(--line-soft); }
}

/* ---------- hero ---------- */
.kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--brass);
  margin-bottom: 18px;
}
.hero { padding: 96px 0 80px; }
.hero-flex { display: flex; align-items: center; gap: 48px; flex-wrap: wrap; }
.hero-icon { width: 264px; max-width: 100%; height: auto; flex-shrink: 0; }
.hero-inner { max-width: 720px; flex: 1; min-width: 280px; }
.hero h1 { font-size: clamp(2.1rem, 4.6vw, 3.1rem); }
.hero .lede { font-size: 17.5px; max-width: 540px; margin-bottom: 2em; }
.hero-actions { display: flex; align-items: center; gap: 26px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  padding: 13px 24px;
  background: var(--brass);
  color: var(--paper);
  border: none;
  cursor: pointer;
  transition: background 0.15s ease;
}
.btn:hover { background: var(--brass-bright); }

.text-link {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--navy);
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
}
.text-link:hover { color: var(--brass); border-bottom-color: var(--brass); }

/* ---------- sections ---------- */
section { padding: 76px 0; }
.section-head { max-width: 620px; margin-bottom: 48px; }
.section-head h2 { font-size: clamp(1.5rem, 2.8vw, 2rem); }

/* ---------- flat feature columns ---------- */
.flat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 44px; }
.flat-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 820px) { .flat-grid, .flat-grid.cols-2 { grid-template-columns: 1fr; gap: 36px; } }
.flat-item { padding-top: 18px; border-top: 1px solid var(--line); }
.flat-item h3 { font-size: 14.5px; text-transform: uppercase; letter-spacing: 0.03em; margin-bottom: 10px; }
.flat-item p { font-size: 15px; margin: 0; }


/* ---------- spec rows ---------- */
.spec-list { border-top: 1px solid var(--line); }
.spec-row { display: grid; grid-template-columns: 250px 1fr; gap: 32px; padding: 24px 0; border-bottom: 1px solid var(--line-soft); }
@media (max-width: 700px) { .spec-row { grid-template-columns: 1fr; gap: 8px; } }
.spec-row .term { font-family: var(--font-mono); font-size: 13.5px; font-weight: 500; color: var(--navy); text-transform: uppercase; letter-spacing: 0.03em; }
.spec-row .desc { font-size: 15px; margin: 0; }

/* ---------- capability grid (icon + text) ---------- */
.cap-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; }
@media (max-width: 760px) { .cap-columns { grid-template-columns: 1fr; gap: 40px; } }
.cap-column-title {
  font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--navy); margin-bottom: 4px;
}
.cap-item {
  display: flex; align-items: flex-start; gap: 16px;
  padding: 18px 0; border-top: 1px solid var(--line);
}
.cap-item p { margin: 0; font-size: 15px; padding-top: 4px; }
.cap-icon-wrap {
  width: 78px; height: 78px; flex-shrink: 0;
  background: var(--paper-deep); border: 1px solid var(--line); border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
}
.cap-icon-wrap img { width: 48px; height: 48px; object-fit: contain; }

.tag-row { display: flex; flex-wrap: wrap; gap: 10px; }
.tag {
  font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-muted);
  border: 1px solid var(--line); padding: 7px 13px;
}

/* ---------- pull statement ---------- */
.pull { font-family: var(--font-mono); font-size: clamp(1.2rem, 2.3vw, 1.6rem); line-height: 1.45; max-width: 920px; color: var(--navy); margin: 0; }
.block-navy .pull { color: var(--paper); }

/* ---------- CTA band ---------- */
.cta-band .wrap { display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.cta-band h2 { font-size: clamp(1.4rem, 2.6vw, 1.9rem); margin: 0; max-width: 500px; }

/* ---------- page header (non-home) ---------- */
.page-head { padding: 72px 0 56px; }
.page-head h1 { font-size: clamp(1.9rem, 3.6vw, 2.5rem); }
.page-head .lede { max-width: 540px; margin: 0; }

/* ---------- footer ---------- */
footer.site-footer { padding: 44px 0 36px; font-size: 13.5px; }
.footer-top {
  display: flex; justify-content: space-between; align-items: flex-start;
  gap: 24px; flex-wrap: wrap; padding-bottom: 28px;
}
.footer-top address { font-style: normal; color: var(--ink-muted); margin-top: 10px; line-height: 1.7; }
.footer-links { display: flex; gap: 22px; font-family: var(--font-mono); flex-wrap: wrap; }
.footer-links a { color: var(--ink-muted); }
.footer-links a:hover { color: var(--brass); }
.footer-bottom {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; flex-wrap: wrap;
  margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--line-soft);
  color: var(--ink-muted); font-family: var(--font-mono); font-size: 12px;
}

/* scale bar — diff-pair icon flourish, footer only */
.scale-bar { display: flex; align-items: center; }
.scale-bar img { display: block; height: 22px; width: auto; }

/* ---------- forms ---------- */
.form-field { margin-bottom: 22px; }
.form-field label {
  display: block; font-family: var(--font-mono); font-size: 12px;
  letter-spacing: 0.05em; text-transform: uppercase; color: var(--ink-muted);
  margin-bottom: 8px;
}
.form-field input, .form-field textarea, .form-field select {
  width: 100%; background: var(--paper); border: 1px solid var(--line);
  color: var(--ink); font-family: var(--font-body); font-size: 15px; padding: 13px 14px;
}
.form-field select { cursor: pointer; }
.form-field input:focus, .form-field textarea:focus, .form-field select:focus { outline: 2px solid var(--brass); outline-offset: 1px; }
.form-field textarea { resize: vertical; min-height: 140px; }
.form-note { font-size: 13px; color: var(--ink-muted); }
.hp-field { position: absolute; left: -9999px; top: -9999px; }

/* ---------- radio group ---------- */
.radio-group { display: flex; flex-direction: column; gap: 10px; }
.radio-group label {
  display: flex; align-items: center; gap: 10px;
  font-size: 15px; color: var(--ink); cursor: pointer;
}
.radio-group input[type="radio"] { accent-color: var(--brass); width: 16px; height: 16px; }

/* ---------- data table (tool output) ---------- */
.data-table { width: 100%; max-width: 640px; border-collapse: collapse; font-size: 14.5px; table-layout: fixed; }
.data-table th, .data-table td {
  border: 1px solid var(--line); padding: 9px 12px; text-align: left;
  width: 25%; overflow: hidden; text-overflow: ellipsis;
}
.data-table th {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.04em;
  text-transform: uppercase; color: var(--navy); background: var(--paper-deep);
  text-align: left;
}
.data-table td { color: var(--ink-muted); }
.data-table-wrap { overflow-x: auto; }

.form-status { display: none; padding: 16px 18px; border-left: 3px solid var(--brass); background: var(--paper-deep); font-size: 14px; margin-bottom: 24px; }
.form-status.visible { display: block; }
.form-status.ok { border-color: var(--navy); }

/* ---------- tools ---------- */
.tools-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 340px)); justify-content: start; gap: 16px; }
.tool-card { background: var(--paper); padding: 26px; display: flex; flex-direction: column; gap: 10px; border: 1px solid var(--line); }
.tool-card h3 { font-size: 15.5px; margin: 0; }
.tool-card h3 a:hover { color: var(--brass); text-decoration: underline; }
.tool-card p { font-size: 14.5px; margin: 0; }
.tool-card .text-link { align-self: flex-start; margin-top: 8px; }
@media (max-width: 820px) { .tools-grid { grid-template-columns: 1fr; } }
.empty-note { border-top: 1px solid var(--line); padding-top: 22px; margin-top: 30px; color: var(--ink-muted); font-size: 14px; }

a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 2px;
}

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