:root {
  color-scheme: dark;

  /* blueprint / drafting-sheet palette */
  --bp-deep:   #0a2340; /* page plane — deep cyanotype navy */
  --bp-mid:    #12395f; /* panel surface */
  --bp-line:   rgba(210, 228, 245, 0.16); /* hairline / grid strokes */
  --bp-line-strong: rgba(210, 228, 245, 0.32);

  --ink:       #eef4fb; /* primary text */
  --ink-dim:   #9fb8d6; /* secondary text */
  --ink-faint: #5f7d9e; /* muted / placeholder */

  --stamp:     #e2543c; /* signature accent — rubber-stamp red */
  --stamp-ink: #fff5f2;

  --font-display: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }

html, body { min-height: 100%; margin: 0; }

body {
  background-color: var(--bp-deep);
  background-image:
    linear-gradient(var(--bp-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--bp-line) 1px, transparent 1px);
  background-size: 34px 34px;
  background-attachment: fixed;
  color: var(--ink);
  font-family: var(--font-body);
}

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--stamp);
  outline-offset: 2px;
}

/* ---------- registration corners (signature device) ---------- */
/* every drawn "sheet" — intro, panel, tool card — gets drafting corner ticks */

.intro, .panel, .tool-card {
  position: relative;
}
.intro::before, .panel::before, .tool-card::before {
  content: "";
  position: absolute;
  inset: 8px;
  pointer-events: none;
  background:
    linear-gradient(var(--bp-line-strong), var(--bp-line-strong)) top left / 10px 1px no-repeat,
    linear-gradient(var(--bp-line-strong), var(--bp-line-strong)) top left / 1px 10px no-repeat,
    linear-gradient(var(--bp-line-strong), var(--bp-line-strong)) top right / 10px 1px no-repeat,
    linear-gradient(var(--bp-line-strong), var(--bp-line-strong)) top right / 1px 10px no-repeat,
    linear-gradient(var(--bp-line-strong), var(--bp-line-strong)) bottom left / 10px 1px no-repeat,
    linear-gradient(var(--bp-line-strong), var(--bp-line-strong)) bottom left / 1px 10px no-repeat,
    linear-gradient(var(--bp-line-strong), var(--bp-line-strong)) bottom right / 10px 1px no-repeat,
    linear-gradient(var(--bp-line-strong), var(--bp-line-strong)) bottom right / 1px 10px no-repeat;
}

/* ---------- title-block nav strip ---------- */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: stretch;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--bp-line);
  background: rgba(10, 35, 64, 0.88);
  backdrop-filter: blur(8px);
}

.brand {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.15rem;
  padding: 0.7rem 1.25rem;
  border-right: 1px solid var(--bp-line);
  text-decoration: none;
  font-family: var(--font-mono);
}
.brand .mark {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink);
  text-transform: uppercase;
}
.brand .sub {
  font-size: 0.66rem;
  color: var(--ink-faint);
  letter-spacing: 0.06em;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
}

.nav-links a {
  display: flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-dim);
  text-decoration: none;
  padding: 0 1rem;
  border-right: 1px solid var(--bp-line);
  transition: background 0.15s ease, color 0.15s ease;
}
.nav-links a:hover {
  background: rgba(210, 228, 245, 0.06);
  color: var(--ink);
}
.nav-links a[aria-current="page"] {
  color: var(--ink);
  background: rgba(226, 84, 60, 0.14);
  box-shadow: inset 0 -2px 0 var(--stamp);
}

.nav-badge {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--ink-faint);
  letter-spacing: 0.05em;
  white-space: nowrap;
}
.nav-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--stamp);
  box-shadow: 0 0 6px var(--stamp);
  flex: none;
}

/* stack into clean full-width rows and turn the tab list into a
   scroll strip instead of letting it wrap — wrapped tabs looked broken */
@media (max-width: 42rem) {
  .site-nav { flex-wrap: wrap; }
  .brand {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--bp-line);
  }
  .nav-links {
    width: 100%;
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
    border-bottom: 1px solid var(--bp-line);
  }
  .nav-links::-webkit-scrollbar { display: none; }
  .nav-links a {
    flex: none;
    white-space: nowrap;
  }
  .nav-links a:last-child { border-right: none; }
  .nav-badge {
    width: 100%;
    justify-content: flex-end;
    padding: 0.5rem 1.25rem;
  }
}

/* ---------- page shell ---------- */

main {
  max-width: 68rem;
  margin: 0 auto;
  padding: 2.5rem 2rem 4rem;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--stamp);
  margin: 0 0 0.75rem;
}

.intro {
  padding: 2rem 2.25rem;
  border: 1px solid var(--bp-line);
  background: var(--bp-mid);
  margin-bottom: 1.75rem;
}

h1 {
  font-family: var(--font-display);
  font-size: 1.7rem;
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 0.6rem;
  color: var(--ink);
}

.intro p, .lede { font-size: 1rem; line-height: 1.7; color: var(--ink-dim); margin: 0; }

.sign {
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
}

/* ---------- home: numbered tool grid ---------- */

.tools {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1rem;
}

.tool-card {
  display: block;
  padding: 1.4rem 1.5rem 1.5rem;
  background: var(--bp-mid);
  border: 1px solid var(--bp-line);
  text-decoration: none;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.tool-card:hover {
  border-color: var(--stamp);
  transform: translateY(-2px);
}
.tool-card .tool-no {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--stamp);
  letter-spacing: 0.06em;
  margin-bottom: 0.6rem;
}
.tool-card .name {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--ink);
  display: block;
  margin-bottom: 0.35rem;
  font-size: 1.05rem;
}
.tool-card .desc { font-size: 0.86rem; color: var(--ink-dim); line-height: 1.5; }

/* ---------- tool panels ---------- */

.panel {
  padding: 1.75rem 2rem;
  background: var(--bp-mid);
  border: 1px solid var(--bp-line);
  margin-bottom: 1.25rem;
}
.panel h2 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--ink-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--bp-line);
}

.split {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 1.25rem;
  align-items: start;
}
@media (max-width: 56rem) {
  .split { grid-template-columns: 1fr; }
}

textarea, input[type="text"] {
  width: 100%;
  background: rgba(6, 20, 38, 0.55);
  border: 1px solid var(--bp-line);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.92rem;
  padding: 0.9rem;
  resize: vertical;
}
textarea::placeholder, input::placeholder { color: var(--ink-faint); }
textarea:focus, input:focus { outline: none; border-color: var(--stamp); }

button {
  background: var(--stamp);
  color: var(--stamp-ink);
  border: none;
  font-family: var(--font-mono);
  padding: 0.7rem 1.2rem;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: opacity 0.15s ease;
}
button:hover { opacity: 0.85; }
button.secondary {
  background: transparent;
  border: 1px solid var(--bp-line-strong);
  color: var(--ink);
}
button.secondary:hover { border-color: var(--stamp); opacity: 1; }

.row { display: flex; gap: 0.6rem; flex-wrap: wrap; align-items: center; margin-top: 1rem; }

/* ---------- KPI row (stat tiles) ---------- */

.stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.7rem;
}
@media (min-width: 56rem) {
  .stats { grid-template-columns: 1fr; }
}

.stat {
  background: rgba(6, 20, 38, 0.4);
  border: 1px solid var(--bp-line);
  padding: 0.85rem 1rem;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
}
.stat .l {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.03em;
  color: var(--ink-faint);
  text-transform: uppercase;
}
.stat .n {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--ink);
}

/* ---------- form controls (select) ---------- */

.ec-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-faint);
}

select {
  background: rgba(6, 20, 38, 0.55);
  border: 1px solid var(--bp-line);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.5rem 0.7rem;
}
select:focus { outline: none; border-color: var(--stamp); }

/* ---------- QR stage ---------- */

.qr-stage {
  display: flex;
  justify-content: center;
  padding: 0.5rem 0;
}

.qr-frame {
  min-height: 12rem;
  min-width: 12rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(6, 20, 38, 0.4);
  border: 1px solid var(--bp-line);
  padding: 1rem;
}

.qr-empty {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-faint);
  text-align: center;
  max-width: 12rem;
}

.qr-img {
  display: block;
  image-rendering: pixelated;
  background: #fff;
  padding: 0.5rem;
}

/* ---------- hero figure (Your IP) ---------- */

.hero-figure {
  font-family: var(--font-mono);
  font-size: 2.8rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--stamp);
  text-align: center;
  padding: 1.8rem 0;
  word-break: break-all;
}