/* ==========================================================================
   Developer Utility Toolbox — Design System
   Concept: a calibration bench, not a terminal. Instruments you trust
   because they show their tolerances. Blueprint paper, brass fittings,
   tick-mark dividers instead of decorative rules.
   ========================================================================== */

:root {
  /* --- Color tokens --- */
  --paper:      #F5F4F0;
  --paper-line: #D8D6CE;
  --ink:        #191C1A;
  --ink-soft:   #565B54;
  --brass:      #A9782E;
  --brass-deep: #7C551D;
  --signal-ok:  #2F6B45;
  --signal-bad: #A5382B;
  --panel:      #FFFFFF;

  /* dark surfaces used only for the input/output "instrument" panels */
  --gauge-bg:   #1B1E1A;
  --gauge-line: #33372F;
  --gauge-text: #E9E7DC;

  /* --- Type tokens --- */
  --font-display: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  --font-body: "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-data: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;

  /* --- Scale --- */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 40px;
  --space-6: 64px;
  --space-7: 96px;

  --radius: 3px;
  --max-w: 1040px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    linear-gradient(var(--paper-line) 1px, transparent 1px) 0 0 / 100% 32px,
    linear-gradient(90deg, var(--paper-line) 1px, transparent 1px) 0 0 / 32px 100%,
    var(--paper);
  background-attachment: local;
  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: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
  html { scroll-behavior: auto; }
}

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

h1, h2, h3 { font-family: var(--font-display); font-weight: 600; letter-spacing: -0.01em; margin: 0; }

.wrap { max-width: var(--max-w); margin: 0 auto; padding: 0 var(--space-4); }

/* --- Top bar --- */
.topbar {
  border-bottom: 1px solid var(--paper-line);
  background: rgba(245,244,240,0.9);
  backdrop-filter: blur(6px);
  position: sticky; top: 0; z-index: 40;
}
.topbar-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: var(--space-2); font-family: var(--font-display); font-weight: 700; font-size: 18px; color: var(--ink); }
.brand .mark { width: 22px; height: 22px; display: inline-flex; align-items: center; justify-content: center;
  border: 1.5px solid var(--ink); border-radius: 2px; font-family: var(--font-data); font-size: 11px; transform: rotate(-3deg); }
.brand:hover { text-decoration: none; }
.topnav { display: flex; gap: var(--space-4); font-size: 14px; }
.topnav a { color: var(--ink-soft); }
.topnav a:hover { color: var(--ink); }

/* --- Tick-mark divider: the signature device. A dimension line, like a
   blueprint measurement, with a running label. Used to separate major
   sections — nowhere else. --- */
.tick-divider {
  display: flex; align-items: center; gap: var(--space-3);
  margin: var(--space-6) 0 var(--space-4);
  color: var(--ink-soft); font-family: var(--font-data); font-size: 12px;
  text-transform: uppercase; letter-spacing: 0.08em;
}
.tick-divider::before, .tick-divider::after {
  content: ""; flex: 1; height: 1px; background:
    repeating-linear-gradient(90deg, var(--ink-soft) 0 1px, transparent 1px 8px);
  opacity: 0.55;
}

/* --- Hero --- */
.hero { padding: var(--space-7) 0 var(--space-6); }
.hero .eyebrow {
  font-family: var(--font-data); font-size: 12px; color: var(--brass-deep);
  text-transform: uppercase; letter-spacing: 0.12em; margin-bottom: var(--space-3);
  display: flex; align-items: center; gap: var(--space-2);
}
.hero .eyebrow::before { content: "▣"; font-size: 10px; }
.hero h1 { font-size: clamp(34px, 5vw, 56px); line-height: 1.05; max-width: 16ch; }
.hero p.lede { font-size: 19px; color: var(--ink-soft); max-width: 56ch; margin-top: var(--space-3); }

/* --- Tool grid (home page) --- */
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1px;
  background: var(--paper-line); border: 1px solid var(--paper-line); margin-top: var(--space-5); }
.tool-card { background: var(--panel); padding: var(--space-4); display: flex; flex-direction: column; gap: var(--space-2); transition: background 120ms ease; }
.tool-card:hover { background: #FCFBF8; text-decoration: none; }
.tool-card .tc-top { display: flex; align-items: baseline; justify-content: space-between; }
.tool-card .tc-id { font-family: var(--font-data); font-size: 11px; color: var(--ink-soft); }
.tool-card h3 { font-size: 19px; color: var(--ink); }
.tool-card p { color: var(--ink-soft); font-size: 14.5px; margin: 0; }
.tool-card .tc-tags { display: flex; gap: var(--space-1); flex-wrap: wrap; margin-top: var(--space-1); }
.pill { font-family: var(--font-data); font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.04em;
  border: 1px solid var(--paper-line); color: var(--ink-soft); padding: 2px 7px; border-radius: 999px; }

/* --- Tool page layout --- */
.tool-header { padding: var(--space-6) 0 var(--space-4); }
.tool-header .breadcrumb { font-family: var(--font-data); font-size: 12px; color: var(--ink-soft); margin-bottom: var(--space-3); }
.tool-header h1 { font-size: clamp(28px, 4vw, 40px); }
.tool-header p.dek { color: var(--ink-soft); font-size: 17px; max-width: 60ch; margin-top: var(--space-2); }

.instrument {
  border: 1px solid var(--ink); border-radius: var(--radius);
  background: var(--panel); margin-top: var(--space-4);
}
.instrument-plate {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-2) var(--space-3); border-bottom: 1px solid var(--paper-line);
  font-family: var(--font-data); font-size: 11px; color: var(--ink-soft); text-transform: uppercase; letter-spacing: 0.06em;
}
.instrument-plate .status { display: flex; align-items: center; gap: 6px; }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--ink-soft); }
.dot.ok { background: var(--signal-ok); }
.dot.bad { background: var(--signal-bad); }

.io-grid { display: grid; grid-template-columns: 1fr; gap: 1px; background: var(--paper-line); }
@media (min-width: 800px) { .io-grid.split { grid-template-columns: 1fr 1fr; } }

.io-pane { background: var(--gauge-bg); color: var(--gauge-text); display: flex; flex-direction: column; }
.io-pane .io-label {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-2) var(--space-3); border-bottom: 1px solid var(--gauge-line);
  font-family: var(--font-data); font-size: 11px; letter-spacing: 0.05em; text-transform: uppercase; color: #A7ABA0;
}
.io-pane textarea, .io-pane pre, .io-pane .io-content {
  flex: 1; margin: 0; padding: var(--space-3);
  background: transparent; color: var(--gauge-text); border: 0; resize: vertical;
  font-family: var(--font-data); font-size: 13.5px; line-height: 1.6; min-height: 220px;
  white-space: pre-wrap; word-break: break-word; overflow: auto;
}
.io-pane textarea:focus { outline: none; }
.io-pane textarea::placeholder { color: #6B6F63; }

.controls { padding: var(--space-3); display: flex; flex-wrap: wrap; gap: var(--space-2); align-items: center;
  border-top: 1px solid var(--paper-line); }
.controls .grow { flex: 1; }

.field-group { display: flex; align-items: center; gap: var(--space-2); font-size: 13.5px; color: var(--ink-soft); }
.field-group label { display: flex; align-items: center; gap: 6px; cursor: pointer; }
select, input[type="number"], input[type="text"] {
  font-family: var(--font-data); font-size: 13px; padding: 6px 8px; border: 1px solid var(--paper-line);
  background: var(--panel); color: var(--ink); border-radius: 2px;
}

button {
  font-family: var(--font-body); font-weight: 600; font-size: 13.5px; cursor: pointer;
  border-radius: 2px; padding: 9px 16px; border: 1px solid var(--ink); background: var(--ink); color: var(--paper);
  transition: transform 80ms ease, background 120ms ease;
}
button:hover { background: #2E322D; }
button:active { transform: translateY(1px); }
button.secondary { background: transparent; color: var(--ink); border-color: var(--paper-line); }
button.secondary:hover { background: #EFEDE6; border-color: var(--ink-soft); }
button.brass { background: var(--brass); border-color: var(--brass-deep); color: #1B1400; }
button.brass:hover { background: var(--brass-deep); color: var(--paper); }
button:disabled { opacity: 0.45; cursor: not-allowed; }

.status-line { padding: var(--space-2) var(--space-3); font-family: var(--font-data); font-size: 12.5px;
  border-top: 1px solid var(--paper-line); display: flex; align-items: center; gap: 8px; min-height: 34px; }
.status-line.ok { color: var(--signal-ok); }
.status-line.bad { color: var(--signal-bad); }

.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(12px); opacity: 0;
  background: var(--ink); color: var(--paper); font-family: var(--font-data); font-size: 13px;
  padding: 10px 16px; border-radius: 3px; pointer-events: none; transition: all 160ms ease; z-index: 100; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* --- Content blocks: privacy, examples, FAQ --- */
.note-block { border-left: 3px solid var(--brass); background: #FBF7EE; padding: var(--space-3) var(--space-4);
  margin-top: var(--space-4); font-size: 14.5px; color: #4A3B1C; }
.note-block strong { color: var(--brass-deep); }

.examples-grid { display: grid; gap: var(--space-2); margin-top: var(--space-3); }
.example-row { display: grid; grid-template-columns: 1fr auto 1fr; gap: var(--space-3); align-items: center;
  border: 1px solid var(--paper-line); background: var(--panel); padding: var(--space-2) var(--space-3); border-radius: 2px; }
.example-row code { font-family: var(--font-data); font-size: 13px; overflow-wrap: anywhere; }
.example-row .arrow { color: var(--brass-deep); font-family: var(--font-data); }

.faq-item { border-bottom: 1px solid var(--paper-line); padding: var(--space-3) 0; }
.faq-item summary { cursor: pointer; font-weight: 600; font-size: 15.5px; list-style: none; display: flex; justify-content: space-between; gap: var(--space-2); }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-family: var(--font-data); color: var(--brass-deep); font-size: 18px; }
.faq-item[open] summary::after { content: "–"; }
.faq-item p { color: var(--ink-soft); margin: var(--space-2) 0 0; font-size: 14.5px; }

.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: var(--space-2); margin-top: var(--space-3); }
.related-card { border: 1px solid var(--paper-line); background: var(--panel); padding: var(--space-3); border-radius: 2px; font-size: 14px; }
.related-card .rc-id { font-family: var(--font-data); font-size: 10.5px; color: var(--ink-soft); text-transform: uppercase; }

/* --- Monetization: ad slot + Pro upsell ---
   Kept visually consistent with the instrument aesthetic (bordered plate,
   not a banner-ad box) so it doesn't read as bolted-on. One ad slot per
   page, placed after the tool itself, never inside or above it. */
.ad-slot {
  margin-top: var(--space-5);
  border: 1px dashed var(--paper-line);
  border-radius: var(--radius);
  background: #FCFBF8;
  min-height: 100px;
  display: flex; align-items: center; justify-content: center;
  padding: var(--space-3);
}
.ad-slot .ad-fallback {
  font-family: var(--font-data); font-size: 11px; color: var(--ink-soft);
  text-transform: uppercase; letter-spacing: 0.06em; text-align: center;
}
.ad-slot .ad-fallback a { color: var(--brass-deep); }

.pro-banner {
  margin-top: var(--space-5);
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--paper);
  padding: var(--space-4);
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-4); flex-wrap: wrap;
}
.pro-banner .pb-copy { max-width: 46ch; }
.pro-banner .pb-eyebrow {
  font-family: var(--font-data); font-size: 11px; color: var(--brass);
  text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 6px;
}
.pro-banner h3 { color: var(--paper); font-size: 18px; margin-bottom: 4px; }
.pro-banner p { color: #C7C9C2; font-size: 14px; margin: 0; }
.pro-banner form { display: flex; gap: 8px; flex-wrap: wrap; }
.pro-banner input[type="email"] {
  font-family: var(--font-body); font-size: 14px; padding: 10px 12px; border-radius: 2px;
  border: 1px solid #444942; background: #23261F; color: var(--paper); min-width: 220px;
}
.pro-banner input[type="email"]::placeholder { color: #7C8074; }
.pro-banner .pb-note { font-size: 11.5px; color: #8B8F84; margin-top: 6px; }

footer { border-top: 1px solid var(--paper-line); margin-top: var(--space-7); padding: var(--space-5) 0; color: var(--ink-soft); font-size: 13px; }
footer .foot-grid { display: flex; justify-content: space-between; flex-wrap: wrap; gap: var(--space-3); }
footer a { color: var(--ink-soft); }

/* --- Sponsor plate: one ad slot per page, styled as an instrument
   nameplate so it reads as part of the bench, not a banner bolted on.
   EthicalAds shows house ads (no revenue) until a site is approved for
   paid ads — see README for setup. --- */
.sponsor-plate {
  border: 1px solid var(--paper-line); border-radius: var(--radius);
  background: var(--panel); margin: var(--space-4) 0;
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-2) var(--space-3); min-height: 42px;
}
.sponsor-plate .sp-label {
  font-family: var(--font-data); font-size: 10px; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--ink-soft); writing-mode: vertical-rl; transform: rotate(180deg); flex-shrink: 0;
}
.sponsor-plate [data-ea-publisher] { flex: 1; font-size: 13.5px; }
.sponsor-plate .ea-content { display: flex; align-items: center; gap: var(--space-2); }
.sponsor-plate .ea-callout-image img { max-height: 34px; display: block; }

/* --- Support link: immediate, no-approval monetization lever --- */
.support-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-data); font-size: 12.5px; color: var(--brass-deep);
  border: 1px solid var(--paper-line); border-radius: 999px; padding: 5px 12px;
}
.support-link:hover { border-color: var(--brass-deep); text-decoration: none; }
.support-link::before { content: "♥"; font-size: 11px; }

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

@media (max-width: 640px) {
  .example-row { grid-template-columns: 1fr; }
  .example-row .arrow { display: none; }
}