/* ==========================================================================
   DevKit — design tokens
   Direction: "instrument panel" — a technical readout, not a marketing page.
   ========================================================================== */

:root {
  /* color */
  --bg:        #0F1512;
  --surface:   #161D19;
  --surface-2: #1C2420;
  --ink:       #E7EDE9;
  --ink-dim:   #92A29B;
  --ink-faint: #788881;
  --accent:    #F2A63C; /* amber — signal / active state */
  --trace:     #5FB89C; /* muted teal-green — trace / info */
  --border:    #2A332E;
  --danger:    #E2705C;

  /* type */
  --font-display: 'Space Mono', ui-monospace, monospace;
  --font-body:    'IBM Plex Sans', system-ui, sans-serif;
  --font-utility: 'IBM Plex Mono', ui-monospace, monospace;

  --radius: 3px;
}

:root[data-theme="light"] {
  --bg:        #F6F8F7;
  --surface:   #FFFFFF;
  --surface-2: #EDF1EF;
  --ink:       #1B2320;
  --ink-dim:   #4E5B55;
  --ink-faint: #5F6B65;
  --accent:    #9A5A00; /* amber — darker for contrast on light */
  --trace:     #1F6E55; /* teal-green — darker for contrast on light */
  --border:    #D8DFDB;
  --danger:    #A63A2B;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--accent);
  padding: 8px 16px;
  font-family: var(--font-utility);
  font-size: 0.8rem;
}
.skip-link:focus { left: 0; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.15;
  margin: 0 0 0.5em;
}
h1 { font-size: clamp(1.8rem, 3.4vw, 2.6rem); }
h2 { font-size: clamp(1.25rem, 2.2vw, 1.6rem); }
h3 { font-size: 1.05rem; }

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

.eyebrow {
  font-family: var(--font-utility);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--trace);
}

.wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- header / readout bar ---------- */

.readout {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.readout .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-height: 40px;
  padding-top: 4px;
  padding-bottom: 4px;
  flex-wrap: wrap;
  font-family: var(--font-utility);
  font-size: 0.75rem;
  color: var(--ink-dim);
}
.readout .cursor {
  display: inline-block;
  width: 7px; height: 13px;
  background: var(--accent);
  margin-left: 6px;
  vertical-align: -2px;
  animation: blink 1.1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

header.site {
  border-bottom: 1px solid var(--border);
}
header.site > .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 68px;
  padding-top: 10px;
  padding-bottom: 10px;
  flex-wrap: wrap;
}
.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 8px;
}
.logo .dot { width: 8px; height: 8px; background: var(--accent); border-radius: 50%; }

nav.site-nav { display: flex; gap: 24px; flex-wrap: wrap; }
nav.site-nav a {
  color: var(--ink-dim);
  font-family: var(--font-utility);
  font-size: 0.85rem;
}
nav.site-nav a:hover { color: var(--ink); text-decoration: none; }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-dim);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px 8px;
  cursor: pointer;
  line-height: 0;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--ink); }
.theme-toggle svg { display: block; }
.theme-toggle .icon-moon { display: none; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: block; }

/* ---------- breadcrumbs ---------- */

.breadcrumbs {
  border-top: 1px solid var(--border);
  background: var(--surface);
  font-family: var(--font-utility);
  font-size: 0.78rem;
  color: var(--ink-faint);
}
.breadcrumbs > .wrap {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0 4px;
  min-height: 40px;
  padding-top: 8px;
  padding-bottom: 8px;
}
.breadcrumbs a { color: var(--ink-faint); }
.breadcrumbs a:hover { color: var(--trace); }

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

.hero {
  padding: 56px 0 40px;
  border-bottom: 1px solid var(--border);
}
.hero h1 { max-width: 680px; }
.hero .lede {
  max-width: 560px;
  color: var(--ink-dim);
  font-size: 1.05rem;
}
.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 28px;
  flex-wrap: wrap;
}
.hero-stat {
  font-family: var(--font-utility);
}
.hero-stat .n { color: var(--accent); font-size: 1.1rem; display: block; }
.hero-stat .l { color: var(--ink-faint); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; }

/* ---------- tool grid (instrument panel) ---------- */

.panel-section { padding: 40px 0; }

.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin-top: 20px;
}
@media (max-width: 760px) {
  .tool-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .tool-grid { grid-template-columns: 1fr; }
}

.tool-card {
  position: relative;
  background: var(--surface);
  padding: 22px 20px;
  display: block;
  color: var(--ink);
  transition: background 0.15s ease;
}
.tool-card:hover { background: var(--surface-2); text-decoration: none; }
.tool-card .tag {
  font-family: var(--font-utility);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--trace);
  display: block;
  margin-bottom: 10px;
}
.tool-card h3 { margin-bottom: 6px; }
.tool-card p { color: var(--ink-dim); font-size: 0.9rem; margin: 0; }

/* corner registration marks — signature detail */
.tool-card::before, .tool-card::after {
  content: "";
  position: absolute;
  width: 8px; height: 8px;
  border: 1px solid var(--ink-faint);
  opacity: 0;
  transition: opacity 0.15s ease;
}
.tool-card::before { top: 6px; left: 6px; border-right: none; border-bottom: none; }
.tool-card::after { bottom: 6px; right: 6px; border-left: none; border-top: none; }
.tool-card:hover::before, .tool-card:hover::after { opacity: 1; border-color: var(--accent); }

/* ---------- tool workspace ---------- */

.workspace {
  padding: 32px 0 8px;
}
.workspace-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
@media (max-width: 720px) {
  .workspace-grid { grid-template-columns: 1fr; }
}
.pane {
  background: var(--surface);
  display: flex;
  flex-direction: column;
}
.pane-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  font-family: var(--font-utility);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.pane textarea, .pane pre {
  flex: 1;
  min-height: 320px;
  margin: 0;
  border: 0;
  background: transparent;
  color: var(--ink);
  font-family: var(--font-utility);
  font-size: 0.88rem;
  line-height: 1.55;
  padding: 16px;
  resize: vertical;
  white-space: pre-wrap;
  word-break: break-word;
}
.pane textarea:focus { outline: none; }
.pane textarea:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.pane pre { overflow: auto; }

.status-line {
  font-family: var(--font-utility);
  font-size: 0.75rem;
  padding: 4px 0;
}
.status-line.ok { color: var(--trace); }
.status-line.error { color: var(--danger); }

.btn {
  font-family: var(--font-utility);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: transparent;
  border: 1px solid var(--ink-faint);
  color: var(--ink-dim);
  padding: 5px 10px;
  cursor: pointer;
  border-radius: var(--radius);
}
.btn:hover { border-color: var(--accent); color: var(--ink); }
.btn.primary { border-color: var(--accent); color: var(--accent); }

/* ---------- content sections (how-to / use-cases / faq) ---------- */

.content-section {
  padding: 40px 0;
  border-top: 1px solid var(--border);
}
.content-section ol, .content-section ul {
  padding-left: 1.3em;
  color: var(--ink);
}
.content-section li { margin-bottom: 0.5em; }

.faq-item {
  border-top: 1px solid var(--border);
  padding: 18px 0;
}
.faq-item:first-of-type { border-top: none; }
.faq-item h3 { margin-bottom: 6px; color: var(--ink); }
.faq-item p { color: var(--ink-dim); margin: 0; }

.related-tools {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 12px;
}
.related-tools a {
  font-family: var(--font-utility);
  font-size: 0.8rem;
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: var(--radius);
  color: var(--ink-dim);
}
.related-tools a:hover { border-color: var(--trace); color: var(--trace); text-decoration: none; }

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

footer.site {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  margin-top: 40px;
}
footer.site .wrap {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-family: var(--font-utility);
  font-size: 0.78rem;
  color: var(--ink-faint);
}
footer.site a { color: var(--ink-faint); margin-right: 16px; }
footer.site a:hover { color: var(--trace); }

@media (prefers-reduced-motion: reduce) {
  .readout .cursor { animation: none; }
  html { scroll-behavior: auto; }
}