/* ==========================================================================
   FIELD MANUAL
   IBM Plex family + cream paper + forest green accent.
   Designed to feel like a typeset technical specification.
   ========================================================================== */

:root {
  --font-serif: "IBM Plex Serif", Georgia, "Times New Roman", serif;
  --font-sans:  "IBM Plex Sans", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-mono:  "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --paper:      #f6f2e9;
  --paper-sunk: #efe9dc;
  --ink:        #0f1310;
  --ink-soft:   #2c322d;
  --muted:      #6b6f65;
  --muted-soft: #8e9286;

  --rule:        #d9d3c4;
  --rule-strong: #c4bcab;

  --accent:      #1f5a48;
  --accent-deep: #143b2f;
  --accent-soft: #e3ecdf;

  --badge-bg:   #b8553a;
  --badge-fg:   #f6f2e9;

  --code-bg: #15191a;
  --code-fg: #efead8;
  --code-muted: #8a8f87;
  --code-border: #2a2e2e;

  --maxw: 56rem;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 18.6px;
  line-height: 1.55;
  font-feature-settings: "ss01", "cv11", "kern";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 4rem 1.75rem 5rem;
  counter-reset: section;
}

/* ----- Typography ----- */

h1, h2, h3 {
  margin: 0 0 0.6rem;
  letter-spacing: -0.015em;
  color: var(--ink);
}

h1 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: clamp(2.1rem, 4vw, 2.75rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

h2 {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.005em;
  margin-bottom: 0.35rem;
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}

/* The signature anchor: "§ 01 — Connect" markers generated from CSS counters. */
section > h2::before {
  counter-increment: section;
  content: "§ " counter(section, decimal-leading-zero);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.78em;
  color: var(--accent);
  letter-spacing: 0.04em;
  padding-right: 0.55rem;
  border-right: 1px solid var(--rule-strong);
  margin-right: 0.1rem;
  align-self: center;
}

h3 {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: -0.005em;
}

p { margin: 0.4rem 0 0.9rem; }
a  { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 2px; }

::selection { background: var(--accent); color: var(--paper); }

/* ----- Header ----- */

.site-header {
  margin-bottom: 2.25rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--rule);
}

.tagline {
  margin-top: 0.85rem;
  color: var(--muted);
  font-size: 1.02rem;
  max-width: 38rem;
}

.badge {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  background: var(--badge-bg);
  color: var(--badge-fg);
  padding: 0.32rem 0.55rem;
  border-radius: 2px;
  align-self: center;
  position: relative;
  top: -2px;
}

/* ----- Sections ----- */

section {
  margin-top: 2.75rem;
}

.section-intro {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0.1rem 0 1.25rem;
  max-width: 42rem;
}

.about p {
  font-size: 1.02rem;
  color: var(--ink-soft);
  max-width: 42rem;
}

#product-list {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--accent-soft);
  color: var(--accent-deep);
  padding: 0.05rem 0.4rem;
  border-radius: 2px;
}

/* ----- Tabs ----- */

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 1px solid var(--rule);
  margin: 0.5rem 0 1.25rem;
}

.tab {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: none;
  border: 0;
  padding: 0.65rem 0.95rem;
  color: var(--muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 120ms ease;
}

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

.tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.tab-panel { display: none; padding-top: 0.4rem; }
.tab-panel.active { display: block; }

.muted { color: var(--muted); font-size: 0.92rem; }
.tab-panel code { font-family: var(--font-mono); font-size: 0.86em; color: var(--accent-deep); }

ul.plain {
  list-style: none;
  padding: 0;
  margin: 0.5rem 0 0;
  display: grid;
  gap: 0.35rem;
}
ul.plain li { font-size: 0.95rem; }

/* ----- Install button ----- */

.install-btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.92rem;
  background: var(--ink);
  color: var(--paper);
  padding: 0.55rem 1rem;
  border-radius: 3px;
  margin-bottom: 0.85rem;
  text-decoration: none;
  border: 1px solid var(--ink);
  transition: background 120ms ease, transform 120ms ease;
}

.install-btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--paper);
  text-decoration: none;
  transform: translateY(-1px);
}

/* ----- Code blocks (dark inverted) ----- */

.code-block {
  background: var(--code-bg);
  border-radius: 4px;
  border: 1px solid var(--code-border);
  margin: 0.4rem 0 1rem;
  overflow: hidden;
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.4rem 0.7rem 0.4rem 0.85rem;
  border-bottom: 1px solid var(--code-border);
  background: rgba(255, 255, 255, 0.025);
}

.code-header > span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--code-muted);
}

.copy {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: transparent;
  color: var(--code-muted);
  border: 1px solid var(--code-border);
  padding: 0.25rem 0.55rem;
  border-radius: 2px;
  cursor: pointer;
  transition: color 120ms ease, border-color 120ms ease, background 120ms ease;
}

.copy:hover {
  color: var(--code-fg);
  border-color: var(--code-fg);
}

.copy.copied {
  color: var(--paper);
  background: var(--accent);
  border-color: var(--accent);
}

.code-block pre {
  margin: 0;
  padding: 0.95rem 1rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.55;
  color: var(--code-fg);
}

.code-block pre code {
  font-family: inherit;
  color: inherit;
  background: none;
}

/* ----- Tools ----- */

#tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(22rem, 1fr));
  gap: 0;
  border-top: 1px solid var(--rule);
}

.tool-card {
  padding: 1.1rem 1.15rem 1.25rem;
  border-bottom: 1px solid var(--rule);
  border-right: 1px solid var(--rule);
  background: var(--paper);
  transition: background 120ms ease;
}

/* Right-edge cells: drop the right rule */
@media (min-width: 44rem) {
  .tool-card:nth-child(2n) { border-right: 0; }
}

.tool-card:hover { background: var(--paper-sunk); }

.tool-card h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.tool-icon {
  color: var(--accent);
  flex-shrink: 0;
}

.tool-desc {
  margin: 0 0 0.85rem;
  color: var(--ink-soft);
  font-size: 0.9rem;
  line-height: 1.55;
}

.params {
  list-style: none;
  margin: 0;
  padding: 0.7rem 0 0;
  border-top: 1px dashed var(--rule);
  display: grid;
  gap: 0.55rem;
}

.param {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: baseline;
  gap: 0.45rem;
  font-size: 0.85rem;
}

.param-name {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--ink);
  font-size: 0.84rem;
}

.param-required {
  color: var(--badge-bg);
  font-weight: 600;
  margin-left: -0.3rem;
}

.param-type {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  text-transform: lowercase;
}

.param-desc {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.45;
  padding-left: 0.05rem;
}

.param-enums {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-top: 0.2rem;
}

.pill {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.02em;
  background: var(--accent-soft);
  color: var(--accent-deep);
  padding: 0.1rem 0.45rem;
  border-radius: 2px;
}

/* ----- Example queries ----- */

.queries .code-block { margin: 0; }

.query-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(20rem, 1fr));
  gap: 0.7rem;
}

.query-card .code-block { background: var(--ink); }
.query-card .code-header { background: rgba(255, 255, 255, 0.03); }

.query-card .code-block pre {
  padding: 0.95rem 1.05rem;
}

.query-card pre code {
  white-space: pre-wrap;
  word-break: break-word;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--code-fg);
  letter-spacing: -0.005em;
}

/* ----- Products & versions ----- */

#product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(22rem, 1fr));
  gap: 0.85rem;
}

.product-card {
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 1.1rem 1.2rem 1rem;
  background: var(--paper);
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
}

.product-card:hover {
  transform: translateY(-1px);
  border-color: var(--rule-strong);
  background: var(--paper-sunk);
}

.product-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.3rem;
}

.product-head h3 {
  margin: 0;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--ink);
  font-family: var(--font-sans);
  letter-spacing: -0.01em;
}

.product-docs {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  white-space: nowrap;
}

.product-docs:hover { color: var(--accent-deep); }

.product-desc {
  color: var(--muted);
  font-size: 0.86rem;
  margin: 0 0 0.85rem;
  line-height: 1.5;
}

.product-summary {
  font-family: var(--font-mono);
  color: var(--muted-soft);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 0.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--rule);
}

.version-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.version-list li {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.4rem 0;
  border-bottom: 1px dashed var(--rule);
  font-size: 0.84rem;
}

.version-list li:last-child { border-bottom: 0; }

.version-num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.85rem;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.version-maturity {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.05rem 0.4rem;
  border-radius: 2px;
  background: var(--badge-bg);
  color: var(--badge-fg);
}

.version-date {
  font-family: var(--font-mono);
  color: var(--muted);
  margin-left: auto;
  font-variant-numeric: tabular-nums;
  font-size: 0.78rem;
  letter-spacing: 0.01em;
}

/* ----- Footer ----- */

.site-footer {
  margin-top: 4rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.82rem;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.site-footer p { margin: 0; }

.site-footer .version {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted-soft);
}

/* ----- Focus styles (accessibility) ----- */

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

/* ----- Responsive ----- */

@media (max-width: 720px) {
  main { padding: 2.5rem 1.25rem 3.5rem; }
  h1 { font-size: 1.85rem; }
  .tabs { gap: 0; overflow-x: auto; }
  .tab { padding: 0.55rem 0.75rem; font-size: 0.72rem; }
  .tool-card { border-right: 0; }
  section { margin-top: 2rem; }
}