/* ==========================================================================
   Fieldkit — shared stylesheet
   Design concept: "workbench" — a technical instrument panel on blueprint
   paper. Utility tools deserve to look like precision instruments, not
   marketing pages. Grid lines evoke drafting paper; the amber accent is
   the single "power light" color used only for live/active states.
   ========================================================================== */

:root {
  /* Color */
  --bg: #f7f7f5;
  --surface: #ffffff;
  --ink: #1b1d1f;
  --ink-soft: #55585c;
  --line: #dadcd8;
  --line-strong: #b9bcb7;
  --accent: #e8a33d;
  --accent-ink: #6b4a12;
  --signal-green: #3e7a57;
  --signal-green-bg: #e9f3ed;
  --signal-red: #b3432f;
  --signal-red-bg: #fbebe7;

  /* Type */
  --font-display: "Bricolage Grotesque", "Helvetica Neue", Arial, sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  /* Layout */
  --max-width: 1040px;
  --grid-cell: 28px;
  --radius: 3px;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: var(--grid-cell) var(--grid-cell);
  background-position: -1px -1px;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

a {
  color: inherit;
}

/* ---- Layout shells ---- */

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

.site-header {
  border-bottom: 1px solid var(--line-strong);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 20;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--ink);
}

.wordmark .dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent);
  flex-shrink: 0;
}

.site-nav {
  display: flex;
  gap: 24px;
  font-size: 14px;
  color: var(--ink-soft);
}

.site-nav a {
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--ink);
}

.site-footer {
  border-top: 1px solid var(--line-strong);
  margin-top: 80px;
  padding: 32px 0 48px;
  font-size: 13px;
  color: var(--ink-soft);
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  align-items: center;
  justify-content: space-between;
}

.site-footer nav {
  display: flex;
  gap: 20px;
}

.site-footer a {
  text-decoration: none;
  color: var(--ink-soft);
}

.site-footer a:hover {
  color: var(--ink);
  text-decoration: underline;
}

/* ---- Hero ---- */

.hero {
  padding: 64px 0 40px;
}

.hero .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--signal-green);
  background: var(--signal-green-bg);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius);
  margin-bottom: 20px;
}

.hero .eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--signal-green);
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  max-width: 14ch;
}

.hero p.lede {
  font-size: 18px;
  color: var(--ink-soft);
  max-width: 46ch;
  margin: 0;
}

/* ---- Tool grid (index) ---- */

.panel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1px;
  background: var(--line-strong);
  border: 1px solid var(--line-strong);
  margin: 40px 0 64px;
}

.tool-card {
  background: var(--surface);
  padding: 24px;
  text-decoration: none;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 168px;
  position: relative;
  transition: background-color 120ms ease;
}

.tool-card:hover {
  background: #fffdf7;
}

.tool-card .tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.tool-card h3 {
  font-family: var(--font-display);
  font-size: 19px;
  margin: 0;
  letter-spacing: -0.01em;
}

.tool-card p {
  font-size: 14px;
  color: var(--ink-soft);
  margin: 0;
  flex-grow: 1;
}

.tool-card .go {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent-ink);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.tool-card.disabled {
  color: var(--ink-soft);
  cursor: default;
}

.tool-card.disabled .go {
  color: var(--ink-soft);
}

.tool-card.disabled:hover {
  background: var(--surface);
}

/* ---- Ad slots ---- */

.ad-slot {
  border: 1px dashed var(--line-strong);
  background: repeating-linear-gradient(
    135deg,
    #ffffff,
    #ffffff 10px,
    #f2f2ef 10px,
    #f2f2ef 20px
  );
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 100px;
  margin: 32px 0;
}

.ad-slot.leaderboard {
  min-height: 90px;
}

.ad-slot.rectangle {
  min-height: 250px;
  max-width: 336px;
}

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

.tool-page main {
  padding-bottom: 48px;
}

.tool-header {
  padding: 40px 0 8px;
}

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 18px;
}

.breadcrumb:hover {
  color: var(--ink);
}

.tool-header h1 {
  font-family: var(--font-display);
  font-size: clamp(26px, 4vw, 36px);
  letter-spacing: -0.02em;
  margin: 0 0 10px;
}

.tool-header p {
  color: var(--ink-soft);
  font-size: 16px;
  max-width: 60ch;
  margin: 0 0 24px;
}

.instrument {
  background: var(--surface);
  border: 1px solid var(--line-strong);
}

.instrument-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line-strong);
}

@media (max-width: 720px) {
  .instrument-body {
    grid-template-columns: 1fr;
  }
}

.pane {
  background: var(--surface);
  display: flex;
  flex-direction: column;
}

.pane-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.pane textarea,
.pane pre {
  flex-grow: 1;
  margin: 0;
  border: none;
  outline: none;
  resize: none;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  padding: 16px;
  min-height: 320px;
  background: transparent;
  color: var(--ink);
  white-space: pre-wrap;
  word-break: break-word;
  overflow: auto;
}

.pane pre.error-text {
  color: var(--signal-red);
}

/* status readout strip — the site's signature element */
.readout {
  font-family: var(--font-mono);
  font-size: 12px;
  border-top: 1px solid var(--line-strong);
  display: flex;
  flex-wrap: wrap;
  gap: 0;
}

.readout .cell {
  padding: 10px 16px;
  border-right: 1px solid var(--line);
  color: var(--ink-soft);
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.readout .cell:last-child {
  border-right: none;
}

.readout .cell strong {
  color: var(--ink);
  font-weight: 600;
}

.readout .cell.status-ok strong {
  color: var(--signal-green);
}

.readout .cell.status-error strong {
  color: var(--signal-red);
}

/* ---- Toolbar / buttons ---- */

.toolbar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 20px 0;
}

.btn {
  font-family: var(--font-mono);
  font-size: 13px;
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--ink);
  padding: 9px 16px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color 120ms ease, background-color 120ms ease;
}

.btn:hover {
  border-color: var(--ink);
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn.primary {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}

.btn.primary:hover {
  background: #000;
}

.btn.accent {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

.btn.accent:hover {
  filter: brightness(0.95);
}

/* ---- Explainer / content sections (SEO copy) ---- */

.explainer {
  max-width: 68ch;
  margin: 56px 0;
}

.explainer h2 {
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: -0.01em;
  margin: 36px 0 12px;
}

.explainer h2:first-child {
  margin-top: 0;
}

.explainer p,
.explainer li {
  color: var(--ink-soft);
  font-size: 15px;
}

.explainer code {
  font-family: var(--font-mono);
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 13px;
  color: var(--ink);
}

/* ---- Utility ---- */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

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