@import "tailwindcss";

/* ============================================================
   CityAPI.org — Field Station design system
   Tokens and primitives. Pages compose these via Tailwind utilities.
   ============================================================ */

@theme {
  /* Surfaces ------------------------------------------------ */
  --color-paper:        oklch(97% 0.005 240);
  --color-paper-raised: oklch(99% 0.003 240);
  --color-paper-sunk:   oklch(94% 0.008 240);

  /* Ink (text + structural lines) -------------------------- */
  --color-ink:          oklch(15% 0.02 240);
  --color-ink-soft:     oklch(22% 0.02 240);
  --color-ink-muted:    oklch(35% 0.02 240);
  --color-ink-faint:    oklch(54% 0.02 240);

  /* Hairlines ---------------------------------------------- */
  --color-rule:         oklch(82% 0.01  240);
  --color-hair:         oklch(88% 0.008 240);

  /* Signal (the one accent — used sparingly, never for prose) */
  --color-signal:       oklch(67% 0.18 50);
  --color-signal-strong:oklch(50% 0.18 50);

  /* Inverse (terminal / code surfaces) --------------------- */
  --color-terminal:     oklch(15% 0.02 240);
  --color-terminal-2:   oklch(28% 0.02 240);
  --color-terminal-fg:  oklch(92% 0.005 240);
  --color-terminal-mid: oklch(70% 0.01 240);

  /* Code syntax — kept readable on the terminal surface ---- */
  --color-code-string:  oklch(75% 0.15 145);
  --color-code-key:     oklch(75% 0.13 50);
  --color-code-tag:     oklch(75% 0.13 280);
  --color-code-com:     oklch(60% 0.01 240);

  /* Type --------------------------------------------------- */
  --font-display: "Big Shoulders Display", "Arial Narrow", sans-serif;
  --font-sans:    "Public Sans", system-ui, -apple-system, sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, "SF Mono", monospace;

  /* Spacing scale (4pt) ------------------------------------ */
  --spacing: 4px;
}

/* ----------------------------------------------------------
   Base
   ---------------------------------------------------------- */
@layer base {
  html {
    background: var(--color-paper);
    color: var(--color-ink-soft);
    -webkit-font-smoothing: antialiased;
    text-size-adjust: 100%;
  }

  body {
    font-family: var(--font-sans);
    font-feature-settings: "kern";
    line-height: 1.5;
  }

  ::selection {
    background: var(--color-signal);
    color: var(--color-ink);
  }

  :focus-visible {
    outline: 2px solid var(--color-signal-strong);
    outline-offset: 3px;
  }

  /* Tabular numerals everywhere a stat lives */
  .tabular { font-feature-settings: "tnum", "lnum"; }
}

/* ----------------------------------------------------------
   Components — patterns that recur across pages
   ---------------------------------------------------------- */
@layer components {
  /* The masthead tickmark rule */
  .tickrule {
    height: 12px;
    background:
      repeating-linear-gradient(to right,
        var(--color-ink) 0, var(--color-ink) 1px,
        transparent 1px, transparent 24px);
    background-size: 100% 1px;
    background-repeat: no-repeat;
    background-position: bottom;
    border-bottom: 2px solid var(--color-ink);
  }

  /* Hazard-stripe rule used above the dark try-it bar */
  .hazardrule {
    height: 6px;
    background: repeating-linear-gradient(to right,
      var(--color-signal) 0, var(--color-signal) 12px,
      var(--color-paper) 12px, var(--color-paper) 18px);
  }

  /* Station rule — between hero and facts */
  .stationrule {
    height: 6px;
    background: repeating-linear-gradient(to right,
      var(--color-ink) 0, var(--color-ink) 12px,
      var(--color-paper) 12px, var(--color-paper) 18px);
  }

  /* Stamp ring — the entity-identifier mark */
  .stamp-ring {
    width: 56px; height: 56px;
    border-radius: 9999px;
    border: 2px solid var(--color-ink);
    display: inline-flex; align-items: center; justify-content: center;
    font-family: var(--font-display);
    font-weight: 900;
    color: var(--color-ink);
    flex-shrink: 0;
    line-height: 1;
  }
  .stamp-ring--3char  { font-size: 1.15rem; letter-spacing: 0.02em; }
  .stamp-ring--2char  { font-size: 1.5rem;  letter-spacing: 0.02em; }
  .stamp-ring--num    { font-size: 1.25rem; letter-spacing: 0;       }
  .stamp-ring--dim    { opacity: 0.45; }

  /* Section bar — header pattern reused across all sections */
  .section-bar {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 1rem;
    align-items: end;
    padding-bottom: 0.85rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--color-ink);
  }
  .section-bar__num {
    font-family: var(--font-display);
    font-weight: 900;
    font-size: 2.5rem;
    line-height: 0.85;
    color: var(--color-signal);
  }
  .section-bar__title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.2rem, 2.5vw, 1.6rem);
    text-transform: uppercase;
    letter-spacing: 0.02em;
    color: var(--color-ink);
  }
  .section-bar__meta {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.06em;
    color: var(--color-ink-faint);
    text-transform: uppercase;
  }

  /* Quiet section bar — for marketing pages */
  .section-bar--quiet { border-bottom-color: var(--color-rule); border-bottom-width: 1px; }
  .section-bar--quiet .section-bar__num { color: var(--color-ink-faint); font-size: 1.5rem; }
  .section-bar--quiet .section-bar__title {
    font-family: var(--font-sans);
    font-weight: 700;
    font-size: clamp(1.4rem, 3vw, 1.9rem);
    text-transform: none;
    letter-spacing: -0.012em;
  }

  /* Fact tile — labeled stat, with tickmark */
  .fact {
    background: var(--color-paper-raised);
    padding: 1.25rem 1.25rem 1.5rem;
    display: flex; flex-direction: column; gap: 0.4rem;
    position: relative;
  }
  .fact__tick {
    position: absolute; top: 0; left: 1.25rem;
    width: 24px; height: 6px; background: var(--color-ink);
  }
  .fact__tick--signal { background: var(--color-signal); }
  .fact__label {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-ink-faint);
    margin-top: 0.6rem;
  }
  .fact__value {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(1.5rem, 3.5vw, 2rem);
    letter-spacing: 0.005em;
    color: var(--color-ink);
    font-feature-settings: "tnum";
    line-height: 1.05;
  }
  .fact__value small {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    color: var(--color-ink-faint);
    margin-left: 0.25rem;
    vertical-align: 0.5em;
    text-transform: uppercase;
  }

  /* Wordmark */
  .wordmark {
    display: inline-flex; align-items: baseline; gap: 0.4rem;
    font-family: var(--font-display);
    font-weight: 900;
    font-size: 1.5rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--color-ink);
    text-decoration: none;
  }
  .wordmark__badge {
    display: inline-block;
    background: var(--color-ink); color: var(--color-paper);
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 0.65rem;
    letter-spacing: 0.08em;
    padding: 2px 6px;
    transform: translateY(-3px);
  }

  /* Eyebrow nav */
  .nav-mono {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    color: var(--color-ink-muted);
    text-decoration: none;
  }
  .nav-mono:hover { color: var(--color-signal-strong); }

  /* Buttons */
  .btn {
    display: inline-flex; align-items: center; gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.04em;
    padding: 0.7rem 1rem;
    text-transform: uppercase;
    text-decoration: none;
    transition: background 120ms, color 120ms;
    cursor: pointer;
  }
  .btn--primary { background: var(--color-ink); color: var(--color-paper); border: 0; }
  .btn--primary:hover { background: var(--color-signal-strong); }
  .btn--ghost {
    background: transparent;
    border: 1px solid var(--color-ink);
    color: var(--color-ink);
  }
  .btn--ghost:hover { background: var(--color-ink); color: var(--color-paper); }

  /* Code block — terminal surface with corner notch */
  .terminal {
    background: var(--color-terminal);
    color: var(--color-terminal-fg);
    border: 2px solid var(--color-ink);
    position: relative;
  }
  .terminal--notched::before {
    content: ""; position: absolute; top: -2px; right: -2px;
    width: 32px; height: 32px;
    background: var(--color-signal);
    pointer-events: none;
  }
  .terminal__bar {
    display: flex; justify-content: space-between; align-items: center;
    padding: 0.7rem 1rem;
    border-bottom: 1px solid var(--color-terminal-2);
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-terminal-mid);
  }
  .terminal__body {
    margin: 0;
    padding: 1.25rem 1.25rem 1.5rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.7;
    overflow-x: auto;
  }

  /* Syntax classes for inline-marked code */
  .c-com { color: var(--color-code-com); font-style: italic; }
  .c-tag { color: var(--color-code-tag); }
  .c-fn  { color: oklch(85% 0.01 240); }
  .c-key { color: var(--color-code-key); }
  .c-str { color: var(--color-code-string); }
  .c-num { color: oklch(85% 0.01 240); font-weight: 500; }

  /* Luggage tag — entity stamp wrapper */
  .luggage {
    display: inline-flex; align-items: center; gap: 0.75rem;
    padding: 0.85rem 1rem;
    border: 2px solid var(--color-ink);
    background: var(--color-paper-raised);
  }
  .luggage__caption {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.06em;
    color: var(--color-ink-faint);
    text-transform: uppercase;
    line-height: 1.4;
  }
  .luggage__caption b {
    display: block;
    color: var(--color-ink);
    font-weight: 700;
    font-size: 0.85rem;
    margin-top: 2px;
  }

  /* Proximity row — name/meta/distance pattern */
  .prox-row {
    display: grid;
    grid-template-columns: 24px 1fr auto auto;
    gap: 1rem;
    padding: 1rem 0;
    align-items: baseline;
    border-bottom: 1px solid var(--color-hair);
  }
  .prox-row__bearing {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--color-signal-strong);
    font-weight: 700;
    letter-spacing: 0.04em;
  }
  .prox-row__name a {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.4rem;
    color: var(--color-ink);
    text-transform: uppercase;
    letter-spacing: 0.01em;
    border-bottom: 2px solid transparent;
    text-decoration: none;
  }
  .prox-row__name a:hover {
    color: var(--color-signal-strong);
    border-bottom-color: var(--color-signal-strong);
  }
  .prox-row__name em {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.04em;
    color: var(--color-ink-faint);
    font-style: normal;
    text-transform: uppercase;
    margin-top: 2px;
  }
  .prox-row__stat {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-ink-soft);
    font-feature-settings: "tnum";
    white-space: nowrap;
  }
  .prox-row__stat--quiet { color: var(--color-ink-faint); }
  .prox-row--simple {
    grid-template-columns: 1fr auto;
  }
  .prox-row--header {
    padding-bottom: 0.4rem;
    padding-top: 0;
    border-bottom-color: var(--color-rule);
    align-items: end;
  }
  .prox-row--header span {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-ink-faint);
  }

  /* Breadcrumb */
  .breadcrumb {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.04em;
    color: var(--color-ink-faint);
    display: flex; gap: 0.5rem; flex-wrap: wrap;
  }
  .breadcrumb a { color: var(--color-ink-faint); text-decoration: none; }
  .breadcrumb a:hover { color: var(--color-signal-strong); }
  .breadcrumb__sep { color: var(--color-rule); }
  .breadcrumb__here { color: var(--color-ink); }

  /* Live indicator (e.g. "OPS NOMINAL") */
  .live-pill {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: oklch(45% 0.13 145);
    padding: 0.2rem 0.5rem;
    border: 1px solid oklch(45% 0.13 145);
  }
  .live-pill::before { content: "● "; }
}