/* shaft — mine-shaft engineering identity.
   Slate ink on cool paper, hi-vis amber marker used sparingly, engineering teal
   for links and healthy status, mono for technical identifiers. */

:root {
  --ink:        #161d22;
  --ink-soft:   #2a343b;
  --surface:    #f4f5f3;
  --raised:     #ffffff;
  --strata:     #e2e5e1;
  --strata-2:   #d3d7d2;
  --muted:      #5c6660;
  --amber:      #e6a817;   /* hi-vis marker — signature accent, sparingly */
  --teal:       #1f6e6a;   /* links, active, healthy */
  --teal-deep:  #164f4c;
  --danger:     #b23a2e;

  --font-display: "Space Grotesk", "Segoe UI", system-ui, sans-serif;
  --font-body:    "Inter", system-ui, -apple-system, sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, "SFMono-Regular", monospace;

  --maxw: 1120px;
  --radius: 4px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--surface);
  line-height: 1.55;
  font-size: 16px;
}

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

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; line-height: 1.15; letter-spacing: -0.01em; }

/* ---- technical label / eyebrow (core-log readout) ---- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.eyebrow::before {
  content: "";
  width: 10px; height: 2px;
  background: var(--amber);
  display: inline-block;
}

.mono { font-family: var(--font-mono); }

/* ---- top nav with depth-rail motif ---- */
.nav {
  border-bottom: 1px solid var(--strata);
  background: var(--surface);
  position: sticky; top: 0; z-index: 20;
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 1.5rem;
  height: 60px; display: flex; align-items: center; gap: 1.5rem;
}
.brand {
  font-family: var(--font-display);
  font-weight: 700; font-size: 1.2rem; letter-spacing: -0.02em;
  color: var(--ink); display: flex; align-items: center; gap: 0.55rem;
}
.brand:hover { text-decoration: none; }
.brand .tick {
  width: 6px; height: 22px; background: var(--amber);
  display: inline-block; border-radius: 1px;
}
.nav-links { display: flex; gap: 1.25rem; margin-left: auto; align-items: center; }
.nav-links a { color: var(--ink-soft); font-size: 0.92rem; font-weight: 500; }
.nav-links a.active { color: var(--teal); }
.nav-cta {
  background: var(--ink); color: var(--surface) !important;
  padding: 0.5rem 0.95rem; border-radius: var(--radius); font-weight: 600;
}
.nav-cta:hover { background: var(--teal-deep); text-decoration: none; }

/* ---- layout ---- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 2.5rem 1.5rem; }
.wrap-narrow { max-width: 720px; margin: 0 auto; padding: 2.5rem 1.5rem; }

/* ---- hero ---- */
.hero {
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 3rem;
  align-items: center; padding: 3.5rem 0 2.5rem;
}
.hero h1 { font-size: 3.2rem; margin: 0.8rem 0 1rem; }
.hero p.lead { font-size: 1.15rem; color: var(--ink-soft); max-width: 46ch; }
.hero-actions { display: flex; gap: 0.75rem; margin-top: 1.6rem; flex-wrap: wrap; }

/* the signature: a depth gauge descending from the surface */
.gauge {
  border-left: 2px solid var(--strata-2);
  padding-left: 1.25rem; position: relative;
}
.gauge .stratum {
  position: relative; padding: 0.9rem 0; border-bottom: 1px dashed var(--strata-2);
}
.gauge .stratum::before {
  content: ""; position: absolute; left: calc(-1.25rem - 2px);
  top: 1.35rem; width: 12px; height: 2px; background: var(--amber);
}
.gauge .depth { font-family: var(--font-mono); font-size: 0.7rem; color: var(--muted); letter-spacing: 0.1em; }
.gauge .layer { font-family: var(--font-display); font-weight: 600; }

/* ---- buttons ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  font-family: var(--font-body); font-weight: 600; font-size: 0.95rem;
  padding: 0.7rem 1.2rem; border-radius: var(--radius); cursor: pointer;
  border: 1px solid transparent; transition: background 0.15s, border-color 0.15s;
}
.btn-primary { background: var(--ink); color: var(--surface); }
.btn-primary:hover { background: var(--teal-deep); text-decoration: none; }
.btn-ghost { background: transparent; border-color: var(--strata-2); color: var(--ink); }
.btn-ghost:hover { border-color: var(--ink); text-decoration: none; }
.btn-amber { background: var(--amber); color: var(--ink); }
.btn-amber:hover { filter: brightness(0.95); text-decoration: none; }
.btn-danger { background: transparent; border-color: var(--danger); color: var(--danger); }
.btn-danger:hover { background: var(--danger); color: #fff; text-decoration: none; }
.btn-sm { padding: 0.4rem 0.7rem; font-size: 0.85rem; }

/* ---- cards / grid ---- */
.grid { display: grid; gap: 1rem; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--raised); border: 1px solid var(--strata);
  border-radius: var(--radius); padding: 1.25rem;
}
.card h3 { margin: 0.2rem 0 0.35rem; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.9rem; }

.connector-card { display: flex; flex-direction: column; gap: 0.6rem; }
.connector-card .role {
  font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.12em;
  text-transform: uppercase; padding: 0.15rem 0.45rem; border-radius: 2px;
  align-self: flex-start;
}
.role.source { background: rgba(31,110,106,0.12); color: var(--teal-deep); }
.role.target { background: rgba(230,168,23,0.18); color: #7a5900; }
.connector-card .foot { margin-top: auto; padding-top: 0.6rem; }

/* ---- section heading ---- */
.section-head { margin: 2.5rem 0 1.25rem; }
.section-head h2 { font-size: 1.5rem; margin: 0.4rem 0 0; }

/* ---- forms ---- */
.form-card { background: var(--raised); border: 1px solid var(--strata); border-radius: var(--radius); padding: 1.75rem; }
.field { margin-bottom: 1.15rem; }
.field label { display: block; font-weight: 600; font-size: 0.9rem; margin-bottom: 0.35rem; }
.field .help { font-size: 0.8rem; color: var(--muted); margin-top: 0.3rem; }
.field .secret-tag {
  font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.1em;
  text-transform: uppercase; color: #7a5900; background: rgba(230,168,23,0.18);
  padding: 0.1rem 0.35rem; border-radius: 2px; margin-left: 0.4rem;
}
input[type=text], input[type=email], input[type=password], input[type=number], textarea, select {
  width: 100%; padding: 0.6rem 0.7rem; font-family: var(--font-body); font-size: 0.95rem;
  border: 1px solid var(--strata-2); border-radius: var(--radius); background: var(--surface);
  color: var(--ink);
}
input:focus, textarea:focus, select:focus {
  outline: 2px solid var(--teal); outline-offset: 1px; border-color: var(--teal); background: #fff;
}
textarea { min-height: 320px; font-family: var(--font-mono); font-size: 0.88rem; line-height: 1.5; }
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1rem; }

/* ---- tables ---- */
table.data { width: 100%; border-collapse: collapse; background: var(--raised); border: 1px solid var(--strata); border-radius: var(--radius); overflow: hidden; }
table.data th, table.data td { text-align: left; padding: 0.7rem 0.9rem; border-bottom: 1px solid var(--strata); font-size: 0.9rem; }
table.data th { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); background: var(--surface); }
table.data tr:last-child td { border-bottom: none; }

/* ---- status chips ---- */
.chip { font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.08em; text-transform: uppercase; padding: 0.18rem 0.5rem; border-radius: 2px; }
.chip.ok { background: rgba(31,110,106,0.14); color: var(--teal-deep); }
.chip.warn { background: rgba(230,168,23,0.2); color: #7a5900; }
.chip.err { background: rgba(178,58,46,0.14); color: var(--danger); }
.chip.neutral { background: var(--strata); color: var(--ink-soft); }

/* ---- notices ---- */
.notice { padding: 0.85rem 1rem; border-radius: var(--radius); font-size: 0.92rem; margin-bottom: 1.25rem; border: 1px solid; }
.notice.flash { background: rgba(31,110,106,0.08); border-color: rgba(31,110,106,0.3); color: var(--teal-deep); }
.notice.error { background: rgba(178,58,46,0.08); border-color: rgba(178,58,46,0.35); color: var(--danger); }
.notice.key { background: var(--ink); color: var(--surface); border-color: var(--ink); }
.notice.key code { font-family: var(--font-mono); font-size: 0.9rem; word-break: break-all; color: var(--amber); }
.field-error { color: var(--danger); font-size: 0.82rem; margin-top: 0.3rem; }

/* ---- trial banner ---- */
.trial-banner {
  display: flex; align-items: center; gap: 0.75rem; justify-content: space-between;
  background: var(--ink); color: var(--surface); padding: 0.7rem 1.1rem;
  border-radius: var(--radius); margin-bottom: 1.5rem; font-size: 0.9rem;
}
.trial-banner .days { font-family: var(--font-mono); color: var(--amber); font-weight: 600; }

/* ---- blog ---- */
.post-list { display: flex; flex-direction: column; gap: 0; }
.post-item { padding: 1.5rem 0; border-bottom: 1px solid var(--strata); }
.post-item:first-child { padding-top: 0; }
.post-item h3 { font-size: 1.35rem; margin: 0.4rem 0 0.4rem; }
.post-item .meta { font-family: var(--font-mono); font-size: 0.72rem; color: var(--muted); letter-spacing: 0.06em; }
.post-item p { color: var(--ink-soft); margin: 0; }

.article { max-width: 680px; }
.article h1 { font-size: 2.4rem; margin: 0.6rem 0 0.4rem; }
.article .meta { font-family: var(--font-mono); font-size: 0.72rem; color: var(--muted); letter-spacing: 0.06em; margin-bottom: 2rem; }
.article-body { font-size: 1.05rem; line-height: 1.7; }
.article-body h1 { font-size: 1.8rem; margin-top: 2rem; }
.article-body h2 { font-size: 1.4rem; margin-top: 1.8rem; }
.article-body pre { background: var(--ink); color: var(--surface); padding: 1rem 1.1rem; border-radius: var(--radius); overflow-x: auto; font-family: var(--font-mono); font-size: 0.85rem; }
.article-body code { font-family: var(--font-mono); font-size: 0.88em; background: var(--strata); padding: 0.1rem 0.3rem; border-radius: 2px; }
.article-body pre code { background: transparent; padding: 0; color: inherit; }
.article-body a { text-decoration: underline; }
.article-body ul { padding-left: 1.2rem; }

/* ---- footer ---- */
.footer { border-top: 1px solid var(--strata); margin-top: 4rem; }
.footer-inner { max-width: var(--maxw); margin: 0 auto; padding: 2rem 1.5rem; display: flex; justify-content: space-between; align-items: center; color: var(--muted); font-size: 0.85rem; flex-wrap: wrap; gap: 1rem; }
.footer .mono { font-size: 0.72rem; letter-spacing: 0.1em; }

/* ---- auth pages ---- */
.auth-shell { max-width: 460px; margin: 3rem auto; padding: 0 1.5rem; }
.auth-shell .form-card { padding: 2rem; }
.auth-alt { text-align: center; margin-top: 1.25rem; font-size: 0.9rem; color: var(--muted); }

.card-bypass-note { font-size: 0.82rem; color: var(--muted); font-family: var(--font-mono); letter-spacing: 0.04em; }

/* ---- utilities ---- */
.muted { color: var(--muted); }
.stack > * + * { margin-top: 1rem; }
.between { display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.mt-0 { margin-top: 0; } .mb-0 { margin-bottom: 0; }

/* ---- responsive ---- */
@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; gap: 1.5rem; padding-top: 2rem; }
  .hero h1 { font-size: 2.4rem; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .row-2, .row-3 { grid-template-columns: 1fr; }
  .nav-links { gap: 0.85rem; }
  .nav-links a.hide-sm { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}