/* ════════════════════════════════════════════════════════════════
   THB TOOLBOX — Design System
   Industrial / utilitarian. Forest green brand. Borders-only depth.
   ════════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Archivo:wdth,wght@62..125,400..800&family=IBM+Plex+Sans:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  /* Brand — THB forest greens */
  --forest-950: #0E2419;
  --forest-900: #143323;
  --forest-800: #1B4430;
  --forest-700: #23573D;
  --forest-500: #3C7A58;
  --forest-300: #8FBCA4;
  --forest-100: #D4E6DC;
  --forest-050: #EDF5F0;

  /* Hi-vis accent — site safety orange, used sparingly */
  --hivis: #E8650D;

  /* Surfaces — light, concrete-neutral with a green cast */
  --surface-page: #F4F6F4;
  --surface-card: #FFFFFF;
  --surface-raised: #FAFBFA;
  --surface-inset: #EEF1EE;

  /* Text hierarchy */
  --text-primary: #18241D;
  --text-secondary: #45544B;
  --text-tertiary: #6E7D73;
  --text-muted: #9AA79F;
  --text-on-dark: #F2F7F4;
  --text-on-dark-dim: #A9C4B4;

  /* Borders */
  --border-soft: #E2E7E3;
  --border-std: #D2DAD4;
  --border-strong: #AFBDB4;

  /* Semantic */
  --status-live: #2E7D4F;
  --status-build: #B97A0F;
  --status-planned: #8A958E;
  --danger: #B3362A;

  /* Type */
  --font-display: 'Archivo', sans-serif;
  --font-body: 'IBM Plex Sans', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  /* Spacing base 4px */
  --s1: 4px;  --s2: 8px;  --s3: 12px; --s4: 16px;
  --s5: 20px; --s6: 24px; --s8: 32px; --s10: 40px; --s12: 48px;

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 10px;

  --maxw: 1080px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--surface-page);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

/* ── Top bar ─────────────────────────────────────────────────── */
.topbar {
  background: var(--forest-950);
  border-bottom: 3px solid var(--hivis);
  color: var(--text-on-dark);
}
.topbar-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: var(--s4) var(--s6);
  display: flex;
  align-items: center;
  gap: var(--s4);
}
.wordmark {
  font-family: var(--font-display);
  font-variation-settings: 'wdth' 118;
  font-weight: 800;
  font-size: 19px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  user-select: none;
  display: flex;
  align-items: baseline;
  gap: var(--s2);
}
.wordmark .tb { color: var(--forest-300); font-weight: 600; }
.topbar-meta {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-on-dark-dim);
}

/* ── Chainage divider — survey-tape motif ─────────────────────── */
.chainage {
  height: 10px;
  background:
    repeating-linear-gradient(90deg,
      var(--border-std) 0 1px, transparent 1px 24px),
    repeating-linear-gradient(90deg,
      var(--border-strong) 0 2px, transparent 2px 120px);
  background-position: bottom;
  background-size: 100% 5px, 100% 10px;
  background-repeat: repeat-x;
  max-width: var(--maxw);
  margin: 0 auto;
  opacity: 0.7;
}

/* ── Layout ──────────────────────────────────────────────────── */
.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: var(--s8) var(--s6) var(--s12);
}

.page-head { margin-bottom: var(--s8); }
.page-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--forest-500);
  margin-bottom: var(--s2);
}
.page-title {
  font-family: var(--font-display);
  font-variation-settings: 'wdth' 110;
  font-weight: 700;
  font-size: 28px;
  letter-spacing: -0.01em;
  line-height: 1.15;
}
.page-sub {
  color: var(--text-secondary);
  margin-top: var(--s2);
  max-width: 56ch;
}

/* ── Tool grid (home) ────────────────────────────────────────── */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--s4);
}

.tool-card {
  background: var(--surface-card);
  border: 1px solid var(--border-std);
  border-radius: var(--radius-lg);
  padding: var(--s5);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: var(--s3);
  transition: border-color 120ms ease, transform 120ms ease;
  position: relative;
  overflow: hidden;
}
.tool-card::before {
  /* spine — equipment-case edge */
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 4px;
  background: var(--forest-700);
  opacity: 0;
  transition: opacity 120ms ease;
}
.tool-card:hover { border-color: var(--forest-500); transform: translateY(-1px); }
.tool-card:hover::before { opacity: 1; }
.tool-card:focus-visible {
  outline: 2px solid var(--forest-500);
  outline-offset: 2px;
}
.tool-card.is-disabled { cursor: default; }
.tool-card.is-disabled:hover { border-color: var(--border-std); transform: none; }
.tool-card.is-disabled:hover::before { opacity: 0; }
.tool-card.is-disabled .tool-name,
.tool-card.is-disabled .tool-desc { color: var(--text-muted); }

.tool-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s3);
}
.tool-code {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-tertiary);
  letter-spacing: 0.06em;
}
.tool-name {
  font-family: var(--font-display);
  font-variation-settings: 'wdth' 106;
  font-weight: 700;
  font-size: 18px;
  line-height: 1.2;
}
.tool-desc {
  color: var(--text-secondary);
  font-size: 14px;
  flex: 1;
}

/* Status LED */
.status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  white-space: nowrap;
}
.status::before {
  content: '';
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--status-planned);
}
.status.live::before    { background: var(--status-live); box-shadow: 0 0 0 3px rgba(46,125,79,.15); }
.status.build::before   { background: var(--status-build); box-shadow: 0 0 0 3px rgba(185,122,15,.15); }
.status.live  { color: var(--status-live); }
.status.build { color: var(--status-build); }

/* ── Tool page chrome ────────────────────────────────────────── */
.crumb {
  display: inline-flex;
  align-items: center;
  gap: var(--s2);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--forest-500);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  cursor: pointer;
  margin-bottom: var(--s4);
  border: none;
  background: none;
  padding: 0;
}
.crumb:hover { color: var(--forest-700); text-decoration: underline; }

.panel {
  background: var(--surface-card);
  border: 1px solid var(--border-std);
  border-radius: var(--radius-lg);
  padding: var(--s6);
}
.panel + .panel { margin-top: var(--s4); }

.panel-title {
  font-family: var(--font-display);
  font-variation-settings: 'wdth' 106;
  font-weight: 700;
  font-size: 16px;
  margin-bottom: var(--s4);
}

/* ── Forms ───────────────────────────────────────────────────── */
.field { margin-bottom: var(--s4); }
.field label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--s1);
}
.field input[type="text"],
.field input[type="number"],
.field input[type="date"],
.field select,
.field textarea {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  background: var(--surface-raised);
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--text-primary);
}
.field textarea { min-height: 110px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: 2px solid var(--forest-500);
  outline-offset: -1px;
  background: var(--surface-card);
}
.field .hint { font-size: 12px; color: var(--text-muted); margin-top: var(--s1); }

.row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s4); }
@media (max-width: 640px) { .row { grid-template-columns: 1fr; } }

/* ── Buttons ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--s2);
  padding: 10px 18px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-family: var(--font-display);
  font-variation-settings: 'wdth' 105;
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: background 120ms ease;
}
.btn-primary { background: var(--forest-800); color: var(--text-on-dark); }
.btn-primary:hover { background: var(--forest-700); }
.btn-secondary {
  background: var(--surface-card);
  border-color: var(--border-strong);
  color: var(--text-primary);
}
.btn-secondary:hover { background: var(--surface-inset); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Notices ─────────────────────────────────────────────────── */
.notice {
  border: 1px solid var(--border-std);
  border-left: 4px solid var(--status-build);
  background: var(--surface-raised);
  border-radius: var(--radius-md);
  padding: var(--s4) var(--s5);
  font-size: 14px;
  color: var(--text-secondary);
}
.notice.info { border-left-color: var(--forest-500); }

/* ── Footer ──────────────────────────────────────────────────── */
.footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: var(--s6);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--border-soft);
}