/* ─────────────────────────────────────────────────────────────────
   Aerial Fiber Heights — refined utilitarian engineering aesthetic
   ───────────────────────────────────────────────────────────────── */

:root {
  --bg:           #F7F5F0;
  --surface:      #FFFFFF;
  --surface-2:    #F1EEE8;
  --border:       #E0DCD0;
  --border-2:     #CFC9BC;
  --text:         #1C1C18;
  --text-2:       #6B6962;
  --text-3:       #94928A;
  --accent:       #1B5E4F;
  --accent-soft:  #E4EEEA;
  --pass:         #2D7138;
  --pass-soft:    #E6F0E6;
  --warn:         #B45309;
  --warn-soft:    #FBEFE0;
  --danger:       #B91C1C;
  --danger-soft:  #F8E4E4;
  --focus:        #1B5E4F;
  --font-sans:    'IBM Plex Sans', system-ui, -apple-system, sans-serif;
  --font-mono:    'IBM Plex Mono', ui-monospace, 'SF Mono', monospace;
  --radius:       6px;
  --radius-lg:    10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:          #15171A;
    --surface:     #1E2125;
    --surface-2:   #262A2F;
    --border:      #2E3338;
    --border-2:    #3A4047;
    --text:        #ECEAE3;
    --text-2:      #A5A39B;
    --text-3:      #74726B;
    --accent:      #5FB39A;
    --accent-soft: #1F3631;
    --pass:        #6BB373;
    --pass-soft:   #1E2E22;
    --warn:        #E29944;
    --warn-soft:   #38291A;
    --danger:      #E26A6A;
    --danger-soft: #3A2222;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  min-height: 100vh;
  padding-bottom: env(safe-area-inset-bottom);
}

.app {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ── Header ──────────────────────────────────────────────── */

.hdr {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 14px 0 12px;
  margin-bottom: 18px;
}

.hdr-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-right: 4px;
}

.brand-name {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--text);
  text-transform: uppercase;
}

.brand-tag {
  font-size: 11px;
  color: var(--text-3);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.spacer { flex: 1; }

/* ── Tabs ───────────────────────────────────────────────── */

.tabs {
  display: flex;
  gap: 2px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 18px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.tab {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 9px 14px;
  font: inherit;
  font-size: 14px;
  color: var(--text-2);
  cursor: pointer;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: -1px;
}

.tab:hover { color: var(--text); }

.tab[aria-selected="true"] {
  color: var(--text);
  border-bottom-color: var(--accent);
}

/* ── Buttons & form controls ─────────────────────────────── */

button, select, input, textarea {
  font-family: inherit;
  font-size: 14px;
  color: var(--text);
}

.btn {
  background: var(--surface);
  border: 1px solid var(--border-2);
  border-radius: var(--radius);
  padding: 7px 12px;
  color: var(--text);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background 0.1s, border-color 0.1s;
  min-height: 36px;
}

.btn:hover { background: var(--surface-2); border-color: var(--text-3); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--focus); outline-offset: 1px; }

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

.btn-primary:hover { background: var(--accent); filter: brightness(1.08); border-color: var(--accent); }

.btn-icon {
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius);
  width: 36px; height: 36px;
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer;
  color: var(--text-2);
}

.btn-icon:hover { background: var(--surface-2); color: var(--text); }

.btn-small {
  padding: 4px 10px;
  font-size: 13px;
  min-height: 30px;
}

select, input[type="text"], input[type="number"], textarea {
  background: var(--surface);
  border: 1px solid var(--border-2);
  border-radius: var(--radius);
  padding: 7px 9px;
  width: 100%;
  min-height: 36px;
}

input[type="text"], input[type="number"] {
  font-variant-numeric: tabular-nums;
}

select:focus, input:focus, textarea:focus {
  outline: 2px solid var(--focus);
  outline-offset: 0;
  border-color: var(--accent);
}

label.field {
  display: block;
}

label.field > span {
  display: block;
  font-size: 12px;
  color: var(--text-2);
  margin-bottom: 4px;
  letter-spacing: 0.02em;
}

/* ── Empty state ─────────────────────────────────────────── */

.empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-2);
}

.empty .ti { font-size: 32px; color: var(--text-3); }
.empty p { margin: 12px 0; }
.empty p.eyebrow { font-size: 13px; color: var(--text-2); }

/* ── Pole card ───────────────────────────────────────────── */

.pole {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 12px;
  overflow: hidden;
}

.pole.has-issues { border-color: var(--danger); }

.pole-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 16px;
  cursor: pointer;
  user-select: none;
}

.pole-head:hover { background: var(--surface-2); }

.pole-label {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.04em;
}

.pole-meta {
  flex: 1;
  min-width: 0;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--text-2);
}

.pole-meta .num { font-variant-numeric: tabular-nums; }

.pole-body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--border);
}

.pole-fields {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
  margin-top: 12px;
}

/* ── Section heading ──────────────────────────────────── */

.section-h {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-2);
  margin: 18px 0 8px;
}

/* ── Attachment rows ──────────────────────────────────── */

.att {
  display: grid;
  grid-template-columns: 1.4fr 1fr 36px;
  gap: 8px;
  align-items: center;
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
}

.att:last-child { border-bottom: none; }

@media (max-width: 480px) {
  .att { grid-template-columns: 1fr 1fr 36px; }
}

/* ── Pills ────────────────────────────────────────────── */

.pill {
  font-size: 11px;
  font-weight: 500;
  padding: 3px 8px;
  border-radius: 999px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-family: var(--font-mono);
}

.pill.pass { background: var(--pass-soft); color: var(--pass); }
.pill.fail { background: var(--danger-soft); color: var(--danger); }
.pill.warn { background: var(--warn-soft); color: var(--warn); }
.pill.info { background: var(--accent-soft); color: var(--accent); }

/* ── Clearance result rows ───────────────────────────── */

.clr {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: var(--radius);
  font-size: 13px;
  margin: 5px 0;
  flex-wrap: wrap;
}

.clr .label { flex: 1; min-width: 0; }
.clr .vals {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px;
  white-space: nowrap;
}
.clr .vals .delta { opacity: 0.65; margin-left: 6px; }

.clr.pass { background: var(--pass-soft); color: var(--pass); }
.clr.fail { background: var(--danger-soft); color: var(--danger); }

/* ── Rules table ──────────────────────────────────────── */

.rule-row {
  display: grid;
  grid-template-columns: 1fr 110px 50px;
  gap: 10px;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}

.rule-row .unit { color: var(--text-2); font-size: 13px; }

/* ── Summary stats ────────────────────────────────────── */

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px;
  margin-bottom: 20px;
}

.stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
}

.stat-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-2);
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 24px;
  font-variant-numeric: tabular-nums;
  margin-top: 4px;
  color: var(--text);
}

.stat.has-issue .stat-value { color: var(--danger); }

/* ── Misc ────────────────────────────────────────────── */

.muted { color: var(--text-2); font-size: 13px; }
.note  { background: var(--surface-2); padding: 10px 12px; border-radius: var(--radius); font-size: 13px; color: var(--text-2); margin-bottom: 14px; }
.row-actions { display: flex; gap: 6px; justify-content: flex-end; margin-top: 14px; }

.chev { color: var(--text-2); transition: transform 0.15s; }
.chev.open { transform: rotate(180deg); }

footer {
  margin: 40px 0 16px;
  padding: 14px 0;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-3);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

footer .ti { vertical-align: -2px; margin-right: 4px; }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}