/* ==================================================================
   Human API — design system
   Concept: "a protocol document that's alive."
   Two voices, one family: IBM Plex Sans (human layer) +
   IBM Plex Mono (machine layer). Light ledger page, dark code islands.
   ================================================================== */

:root {
  /* palette */
  --bg: #fafbfc;            /* ledger white */
  --surface: #ffffff;
  --ink: #0e1726;           /* navy-black */
  --muted: #5a6b7e;         /* slate */
  --line: #dfe5ec;          /* hairline */
  --accent: #2742f5;        /* ultramarine */
  --accent-ink: #1c31c8;
  --accent-soft: #eef1fe;
  --ok: #0ba05e;            /* signal green — status semantics only */
  --warn: #b7791f;
  --bad: #c53030;
  --code-bg: #0c1220;       /* deep navy code island */
  --code-text: #d7e0ee;
  --code-key: #7ea5ff;
  --code-str: #9ed8b5;
  --code-dim: #64748e;

  /* type */
  --sans: "IBM Plex Sans", -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "Cascadia Code", Consolas, monospace;

  /* layout */
  --max: 1120px;
  --radius: 6px;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { max-width: 100%; height: auto; }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-ink); text-decoration: underline; }

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: #fff;
  padding: 0.6rem 1rem;
  z-index: 100;
}
.skip-link:focus { left: 0; }

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ---------- typography ---------- */

h1, h2, h3 {
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin: 0 0 0.75rem;
}
h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); font-weight: 650; letter-spacing: -0.035em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); }
h3 { font-size: 1.15rem; }

p { margin: 0 0 1rem; }
.lede { font-size: 1.2rem; color: var(--muted); max-width: 42rem; }
.muted { color: var(--muted); }
.small { font-size: 0.875rem; }

/* machine layer — mono eyebrows and strips */
.machine, .eyebrow {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.01em;
}
.eyebrow {
  display: block;
  color: var(--accent);
  margin-bottom: 1rem;
}
.eyebrow .dim { color: var(--muted); }

code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--accent-soft);
  color: var(--accent-ink);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  /* When a chip wraps across lines, style each fragment as a complete
     pill instead of leaving bare cut edges. */
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

/* dark code islands */
pre.code {
  background: var(--code-bg);
  color: var(--code-text);
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.6;
  padding: 1.1rem 1.25rem;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 0 0 1rem;
  tab-size: 2;
}
pre.code code { background: none; color: inherit; padding: 0; font-size: inherit; }
pre.code .k { color: var(--code-key); }   /* keys */
pre.code .s { color: var(--code-str); }   /* strings */
pre.code .d { color: var(--code-dim); }   /* dim / punctuation */
pre.code .c { color: var(--code-dim); font-style: italic; } /* comments */

.code-titled { margin-bottom: 1.5rem; }
.code-title {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--muted);
  background: #e8edf3;
  border: 1px solid var(--line);
  border-bottom: none;
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 0.4rem 1rem;
}
.code-titled pre.code { border-radius: 0 0 var(--radius) var(--radius); margin-bottom: 0; }

/* ---------- header / nav ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 251, 252, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  min-height: 60px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-weight: 650;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.logo:hover { text-decoration: none; color: var(--ink); }
.logo-mark {
  width: 24px; height: 24px; flex: none;
  border-radius: 6px; /* matches the mark's own corner radius at this size */
}

.site-nav { margin-left: auto; }
.site-nav ul {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav a {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 500;
}
.site-nav a:hover { color: var(--ink); text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--ink); }
.site-nav a.btn-primary { color: #fff; }
.site-nav a.btn-primary:hover { color: #fff; }
.site-nav a.nav-agent {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--accent);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
}
.site-nav a.nav-agent:hover { border-color: var(--accent); }

.nav-toggle {
  display: none;
  margin-left: auto;
  background: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.45rem 0.6rem;
  cursor: pointer;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.8rem;
}

/* ---------- buttons ---------- */

.btn {
  display: inline-block;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.65rem 1.3rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-ink); color: #fff; text-decoration: none; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ink); text-decoration: none; color: var(--ink); }
.btn-sm { font-size: 0.85rem; padding: 0.45rem 0.95rem; }

/* ---------- page scaffolding ---------- */

.page-head { padding: 3.5rem 0 2rem; border-bottom: 1px solid var(--line); }
section.block { padding: 3.5rem 0; }
section.block + section.block { border-top: 1px solid var(--line); }
.section-head { margin-bottom: 2rem; max-width: 46rem; }

/* ---------- hero ---------- */

.hero { padding: 4.5rem 0 4rem; overflow: hidden; }
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 3.5rem;
  align-items: center;
}
.hero h1 { max-width: 15ch; }
.hero .lede { margin: 1.25rem 0 2rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.8rem; align-items: center; }
.hero-meta {
  margin-top: 2.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1.75rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
}
.hero-meta dd { margin: 0; } /* kill the browser's default 40px dd indent */
.hero-meta strong { display: block; color: var(--ink); font-weight: 500; }

.hero-terminal {
  background: var(--code-bg);
  border-radius: 10px;
  box-shadow: 0 24px 60px -24px rgba(14, 23, 38, 0.45);
  min-width: 0;
}
.hero-terminal-bar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.65rem 1.1rem;
  border-bottom: 1px solid rgba(215, 224, 238, 0.12);
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--code-dim);
}
.hero-terminal-bar .dot { width: 9px; height: 9px; border-radius: 50%; background: rgba(215,224,238,0.18); flex: none; }
.hero-terminal pre {
  margin: 0;
  padding: 1.1rem 1.25rem 1.35rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.65;
  color: var(--code-text);
  overflow-x: auto;
  min-height: 21em;
}
.cursor {
  display: inline-block;
  width: 0.55em; height: 1.1em;
  background: var(--code-key);
  vertical-align: text-bottom;
  animation: blink 1.1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* live status dot */
.status-live {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ok);
}
.status-live::before {
  content: "";
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--ok);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse { 50% { opacity: 0.35; } }

/* ---------- cards & grids ---------- */

.grid { display: grid; gap: 1rem; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem 1.5rem;
  transition: border-color 0.15s ease;
}
a.card { color: var(--ink); display: block; }
a.card:hover { text-decoration: none; border-color: var(--accent); }
.card h3 { margin-bottom: 0.4rem; }
.card p { margin-bottom: 0; color: var(--muted); font-size: 0.92rem; }
.card .machine { color: var(--accent); display: block; margin-bottom: 0.75rem; font-size: 0.72rem; }
.card .price-band {
  display: block;
  margin-top: 0.9rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink);
}

/* steps — a real sequence, so numbering carries meaning */
.steps { counter-reset: step; }
.step { position: relative; }
.step .step-n {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
  display: block;
  margin-bottom: 0.7rem;
}
/* Reserve two title lines so paragraphs start on the same baseline in
   every card, whether or not the heading wraps. */
.step h3 { min-height: 2.3em; }

/* ---------- definition rows (profile / spec) ---------- */

.spec {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
}
.spec-row {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 1rem;
  padding: 0.85rem 1.25rem;
}
.spec-row + .spec-row { border-top: 1px solid var(--line); }
.spec-row dt {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
  padding-top: 0.15rem;
}
.spec-row dd { margin: 0; font-size: 0.95rem; }

/* ---------- tables ---------- */

.table-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: 0.9rem; }
th, td { text-align: left; padding: 0.7rem 1rem; border-bottom: 1px solid var(--line); vertical-align: top; }
tr:last-child td { border-bottom: none; }
th {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--muted);
  text-transform: none;
  background: #f2f5f8;
}
td code { white-space: nowrap; }

/* ---------- pills / badges ---------- */

.pill {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
  background: var(--surface);
}
.pill-ok { color: var(--ok); border-color: rgba(11, 160, 94, 0.35); }
.pill-warn { color: var(--warn); border-color: rgba(183, 121, 31, 0.35); }
.pill-bad { color: var(--bad); border-color: rgba(197, 48, 48, 0.35); }
.pill-accent { color: var(--accent); border-color: rgba(39, 66, 245, 0.35); }

/* method badges in API docs */
.method {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  margin-right: 0.5rem;
}
.method-get { background: var(--accent-soft); color: var(--accent-ink); }
.method-post { background: rgba(11, 160, 94, 0.12); color: #0a7a49; }
.method-patch { background: rgba(183, 121, 31, 0.12); color: #96621a; }

/* ---------- forms ---------- */

form.panel, .panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.75rem;
}
.field { margin-bottom: 1.25rem; }
.field label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.35rem;
}
.field .hint {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.3rem;
}
.field input[type="text"],
.field input[type="email"],
.field input[type="number"],
.field input[type="datetime-local"],
.field select,
.field textarea {
  width: 100%;
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.6rem 0.8rem;
}
.field textarea { min-height: 130px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 0;
  border-color: var(--accent);
}
.field-inline { display: flex; align-items: flex-start; gap: 0.6rem; }
.field-inline input[type="checkbox"] { margin-top: 0.3rem; width: 16px; height: 16px; accent-color: var(--accent); }
.field-inline label { font-weight: 500; margin: 0; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 1.25rem; }

.form-error {
  border: 1px solid rgba(197, 48, 48, 0.4);
  background: rgba(197, 48, 48, 0.06);
  color: var(--bad);
  border-radius: var(--radius);
  padding: 0.8rem 1rem;
  font-size: 0.88rem;
  margin-bottom: 1.25rem;
}
.form-success {
  border: 1px solid rgba(11, 160, 94, 0.4);
  background: rgba(11, 160, 94, 0.06);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.task-id-display {
  font-family: var(--mono);
  font-size: 1.3rem;
  color: var(--ink);
  background: var(--accent-soft);
  border: 1px dashed var(--accent);
  border-radius: var(--radius);
  padding: 0.7rem 1rem;
  display: inline-block;
  margin: 0.75rem 0;
  user-select: all;
}

/* ---------- status timeline ---------- */

.timeline { list-style: none; margin: 1.5rem 0 0; padding: 0; }
.timeline li {
  position: relative;
  padding: 0 0 1.4rem 2rem;
  border-left: 2px solid var(--line);
  margin-left: 0.5rem;
}
.timeline li:last-child { padding-bottom: 0.25rem; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -7px; top: 0.3rem;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid var(--line);
}
.timeline li.done { border-left-color: var(--ok); }
.timeline li.done::before { background: var(--ok); border-color: var(--ok); }
.timeline li.current::before { background: var(--surface); border-color: var(--ok); }
.timeline .t-status { font-family: var(--mono); font-size: 0.82rem; font-weight: 500; }
.timeline .t-time { font-size: 0.78rem; color: var(--muted); display: block; }

/* ---------- notices ---------- */

.notice {
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  font-size: 0.9rem;
  margin: 1.5rem 0;
}
.notice-warn { border-left-color: var(--warn); }

/* lists on trust page */
ul.checklist, ul.crosslist { list-style: none; margin: 0 0 1rem; padding: 0; }
ul.checklist li, ul.crosslist li {
  padding: 0.45rem 0 0.45rem 1.9rem;
  position: relative;
}
ul.checklist li::before, ul.crosslist li::before {
  font-family: var(--mono);
  position: absolute;
  left: 0.25rem;
  font-weight: 600;
}
ul.checklist li::before { content: "✓"; color: var(--ok); }
ul.crosslist li::before { content: "✕"; color: var(--bad); }

/* ---------- pricing ---------- */

.tier { display: flex; flex-direction: column; }
.tier .tier-price {
  font-size: 1.7rem;
  font-weight: 650;
  letter-spacing: -0.03em;
  margin: 0.5rem 0 0.25rem;
}
.tier .tier-unit { font-family: var(--mono); font-size: 0.72rem; color: var(--muted); }
.tier ul { list-style: none; margin: 1rem 0 0; padding: 0; font-size: 0.88rem; color: var(--muted); }
.tier ul li { padding: 0.3rem 0 0.3rem 1.4rem; position: relative; }
.tier ul li::before { content: "—"; position: absolute; left: 0; color: var(--accent); }
.tier-featured { border-color: var(--accent); box-shadow: 0 12px 32px -18px rgba(39, 66, 245, 0.35); }

/* ---------- admin ---------- */

.stat-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; margin-bottom: 2rem; }
.stat {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
}
.stat .stat-n { font-size: 1.9rem; font-weight: 650; letter-spacing: -0.03em; line-height: 1.2; }
.stat .stat-l { font-family: var(--mono); font-size: 0.72rem; color: var(--muted); }
.admin-desc { max-width: 46ch; white-space: pre-line; font-size: 0.85rem; }
td select.status-select {
  font-family: var(--mono);
  font-size: 0.78rem;
  padding: 0.3rem 0.4rem;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--bg);
  color: var(--ink);
}

/* ---------- traffic chart (admin) ---------- */

.chart {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 140px;
}
.chart .cbar {
  flex: 1;
  min-width: 8px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 2px;
}
.chart .seg { border-radius: 2px; min-height: 0; }
.chart .seg-m { background: var(--accent); }
.chart .seg-h { background: #cfd9e5; }
.chart-x {
  display: flex;
  gap: 6px;
  margin-top: 0.4rem;
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--muted);
}
.chart-x span { flex: 1; min-width: 8px; text-align: center; }
.chip {
  display: inline-block;
  width: 10px; height: 10px;
  border-radius: 2px;
  vertical-align: baseline;
}
.chip-m { background: var(--accent); }
.chip-h { background: #cfd9e5; }

/* ---------- CTA band ---------- */

.cta-band {
  background: var(--code-bg);
  color: var(--code-text);
  border-radius: 10px;
  padding: 3rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.cta-band h2 { color: #fff; margin-bottom: 0.4rem; }
.cta-band p { color: var(--code-dim); margin: 0; }
.cta-band .machine { color: var(--code-key); display: block; margin-bottom: 0.75rem; }

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 4rem;
  padding: 3rem 0 2rem;
  font-size: 0.88rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2.5rem;
}
.site-footer h3 {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--muted);
  margin-bottom: 0.9rem;
}
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 0.5rem; }
.site-footer a { color: var(--ink); }
.site-footer a.mono-link { font-family: var(--mono); font-size: 0.8rem; color: var(--accent); }
.footer-note {
  border-top: 1px solid var(--line);
  padding-top: 1.5rem;
  color: var(--muted);
  font-size: 0.8rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
}

/* ---------- responsive ---------- */

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stat-row { grid-template-columns: repeat(2, 1fr); }
}

/* nav collapses earlier than content — eight items need the room */
@media (max-width: 1000px) {
  .nav-toggle { display: block; }
  .site-nav {
    display: none;
    position: absolute;
    top: 60px; left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    padding: 1rem 1.25rem 1.5rem;
  }
  .site-nav.open { display: block; }
  .site-nav ul { flex-direction: column; align-items: flex-start; gap: 1rem; }
}

@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .spec-row { grid-template-columns: 1fr; gap: 0.2rem; }
  .cta-band { padding: 2rem 1.5rem; }
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---------- motion discipline ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  .cursor { animation: none; }
}

@media print {
  .site-header, .site-footer, .hero-actions, .nav-toggle { display: none; }
}