/* RCCA Copilot — engineering-document / instrument-panel aesthetic.
   Cool blueprint paper, ink, a faint technical grid, monospace data,
   semantic state colors. Refined and legible — it's an audit tool. */

:root {
  --paper: #eef1f4;
  --paper-2: #f7f9fb;
  --ink: #14181f;
  --ink-2: #41505f;
  --ink-3: #7c8a98;
  --line: #c9d2db;
  --line-2: #dbe2e9;

  --brand: #0b5563;       /* deep instrument teal */
  --brand-ink: #06343d;

  --drafted: #64748b;     /* slate */
  --edited: #b45309;      /* amber */
  --approved: #15803d;    /* green */
  --blocked: #b4232a;     /* signal red */

  --grid: rgba(11, 85, 99, 0.06);
  --shadow: 0 1px 0 var(--line), 0 12px 30px -18px rgba(20, 24, 31, 0.4);

  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --sans: "Hanken Grotesk", system-ui, sans-serif;
  --display: "Saira", var(--sans);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 28px 28px;
  line-height: 1.55;
}

a { color: var(--brand); text-decoration: none; }

/* ---- shell ---- */
.masthead {
  border-bottom: 1.5px solid var(--ink);
  background: var(--paper-2);
  position: sticky;
  top: 0;
  z-index: 10;
}
.masthead__inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}
.wordmark {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}
.wordmark__tick { color: var(--brand); }
.masthead__meta {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--ink-3);
  text-transform: uppercase;
}

.wrap { max-width: 1120px; margin: 0 auto; padding: 2.5rem 1.5rem 4rem; }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--brand);
  margin: 0 0 0.6rem;
}
h1.title {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1.05;
  letter-spacing: -0.01em;
  margin: 0 0 0.5rem;
}
.lede { color: var(--ink-2); max-width: 54ch; margin: 0 0 2rem; }

/* ---- sample picker ---- */
.samples {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}
.sample {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.2rem 1.2rem 1.4rem;
  background: var(--paper-2);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  text-align: left;
  font: inherit;
  color: inherit;
  cursor: pointer;
  transition: transform 0.12s ease, border-color 0.12s ease, box-shadow 0.12s ease;
}
.sample::before {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px solid var(--line-2);
  pointer-events: none;
}
.sample:hover {
  transform: translateY(-2px);
  border-color: var(--brand);
  box-shadow: 0 1px 0 var(--brand), 0 18px 36px -20px rgba(11, 85, 99, 0.55);
}
.sample__id {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--brand);
}
.sample__title { font-family: var(--display); font-weight: 600; font-size: 1.08rem; }
.sample__proc { font-size: 0.85rem; color: var(--ink-3); }
.sample__cta {
  margin-top: 0.4rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-2);
}

/* ---- spec sheet (NC summary) ---- */
.specsheet {
  border: 1.5px solid var(--ink);
  background: var(--paper-2);
  margin-bottom: 2rem;
}
.specsheet__head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--line);
}
.specsheet__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}
.field {
  padding: 0.7rem 1.25rem;
  border-top: 1px solid var(--line-2);
  border-right: 1px solid var(--line-2);
}
.field__k {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.field__v { font-family: var(--mono); font-size: 0.92rem; color: var(--ink); }
.field__v.alarm { color: var(--blocked); }

/* ---- readiness gate ---- */
.gate {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  padding: 1rem 1.25rem;
  border: 1.5px solid var(--ink);
  background: var(--paper-2);
  margin-bottom: 2rem;
  position: sticky;
  top: 56px;
  z-index: 5;
}
.gate__meter { display: flex; gap: 5px; }
.pip { width: 26px; height: 10px; background: var(--line); border: 1px solid var(--line); }
.pip.on { background: var(--approved); border-color: var(--approved); }
.gate__label { font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.04em; }
.gate__spacer { flex: 1; }

/* ---- section cards ---- */
.section {
  display: grid;
  grid-template-columns: 88px 1fr;
  border: 1px solid var(--line);
  background: var(--paper-2);
  box-shadow: var(--shadow);
  margin-bottom: 1rem;
}
.section__rail {
  border-right: 1px solid var(--line);
  padding: 1.1rem 0.8rem;
  background:
    repeating-linear-gradient(45deg, transparent, transparent 7px, rgba(11,85,99,0.04) 7px, rgba(11,85,99,0.04) 8px);
}
.section__d {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.7rem;
  letter-spacing: 0.02em;
  color: var(--brand);
}
.section__dlabel {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.section__body { padding: 1.1rem 1.25rem 1.25rem; min-width: 0; }
.section__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  margin-bottom: 0.6rem;
}
.section__title { font-family: var(--display); font-weight: 600; font-size: 1.05rem; }

textarea.draft {
  width: 100%;
  min-height: 4.5rem;
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 0.7rem 0.8rem;
  resize: vertical;
}
textarea.draft:focus { outline: 2px solid var(--brand); border-color: var(--brand); }

.controls { display: flex; gap: 0.6rem; align-items: center; margin-top: 0.7rem; }

/* ---- badges ---- */
.badge {
  font-family: var(--mono);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.28rem 0.55rem;
  border: 1px solid currentColor;
  white-space: nowrap;
}
.badge--drafted { color: var(--drafted); }
.badge--engineer_edited { color: var(--edited); }
.badge--approved { color: var(--approved); }
.state-meta { font-family: var(--mono); font-size: 0.66rem; color: var(--ink-3); }

/* ---- buttons ---- */
.btn {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.55rem 0.95rem;
  border: 1.5px solid var(--ink);
  background: var(--paper-2);
  color: var(--ink);
  cursor: pointer;
  transition: background 0.12s ease, color 0.12s ease;
}
.btn:hover { background: var(--ink); color: var(--paper-2); }
.btn--approve { border-color: var(--approved); color: var(--approved); }
.btn--approve:hover { background: var(--approved); color: var(--paper-2); }
.btn--primary { border-color: var(--brand); color: var(--paper-2); background: var(--brand); }
.btn--primary:hover { background: var(--brand-ink); }
.btn[disabled], .btn[aria-disabled="true"] {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}
.err { color: var(--blocked); font-size: 0.8rem; font-family: var(--mono); margin-top: 0.4rem; }

/* ---- evidence panel ---- */
.evidence { margin-top: 1.1rem; border-top: 1px dashed var(--line); padding-top: 1rem; }
.evidence__h {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 0.7rem;
}
.cause {
  border-left: 3px solid var(--brand);
  padding: 0.5rem 0 0.5rem 0.8rem;
  margin-bottom: 0.9rem;
}
.cause__top { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.tag {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.16rem 0.4rem;
  border: 1px solid var(--line);
  color: var(--ink-2);
}
.conf { font-family: var(--mono); font-size: 0.62rem; font-weight: 600; letter-spacing: 0.06em; padding: 0.16rem 0.45rem; }
.conf--high { color: var(--approved); border: 1px solid var(--approved); }
.conf--medium { color: var(--edited); border: 1px solid var(--edited); }
.conf--low { color: var(--ink-3); border: 1px solid var(--ink-3); }
.conf--insufficient { color: var(--blocked); border: 1px solid var(--blocked); }
.cause__desc { margin: 0.4rem 0 0.5rem; font-size: 0.92rem; }
.cites { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.cite {
  font-family: var(--mono);
  font-size: 0.66rem;
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 0.35rem 0.5rem;
}
.cite b { color: var(--brand); }
#chart { width: 100%; height: 300px; margin-top: 0.8rem; border: 1px solid var(--line); background: var(--paper); }

/* ---- footer ---- */
.disclaimer {
  border-top: 1px solid var(--line);
  margin-top: 3rem;
  padding: 1.2rem 1.5rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--ink-3);
  text-align: center;
}

/* ---- export gate pages ---- */
.gatepage { max-width: 620px; margin: 4rem auto; text-align: center; }
.stamp {
  display: inline-block;
  font-family: var(--display);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.7rem 1.4rem;
  border: 3px solid var(--approved);
  color: var(--approved);
  transform: rotate(-3deg);
  font-size: 1.4rem;
}
.stamp--blocked { border-color: var(--blocked); color: var(--blocked); }

/* ---- export document ---- */
pre.doc {
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper-2);
  border: 1.5px solid var(--ink);
  padding: 2rem 2.2rem;
  white-space: pre-wrap;
  word-wrap: break-word;
  box-shadow: var(--shadow);
}

/* ---- audit trail ---- */
.audit-row { border: 1px solid var(--line); background: var(--paper-2); margin-bottom: 1rem; box-shadow: var(--shadow); }
.audit-row__head {
  display: flex; align-items: center; justify-content: space-between; gap: 0.8rem;
  padding: 0.8rem 1.1rem; border-bottom: 1px solid var(--line);
}
.diff { display: grid; grid-template-columns: 1fr 1fr; }
.diff__col { padding: 0.9rem 1.1rem; }
.diff__col--final { border-left: 1px solid var(--line); background: rgba(21, 128, 61, 0.04); }
.diff__k {
  font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--ink-3); margin-bottom: 0.4rem;
}
.diff__t { font-size: 0.92rem; white-space: pre-wrap; }

.timeline { list-style: none; padding: 0; margin: 0.6rem 0 0; border-left: 2px solid var(--line); }
.timeline li { padding: 0.4rem 0 0.4rem 1rem; position: relative; }
.timeline li::before {
  content: ""; position: absolute; left: -5px; top: 0.85rem;
  width: 8px; height: 8px; background: var(--brand); border-radius: 50%;
}
.tl-type {
  font-family: var(--mono); font-size: 0.62rem; font-weight: 600; letter-spacing: 0.08em;
  text-transform: uppercase; padding: 0.12rem 0.4rem; border: 1px solid currentColor; margin-right: 0.5rem;
}
.tl-type--draft { color: var(--ink-3); }
.tl-type--edit { color: var(--edited); }
.tl-type--revert { color: var(--blocked); }
.tl-type--approve { color: var(--approved); }
.tl-meta { font-family: var(--mono); font-size: 0.7rem; color: var(--ink-3); margin-right: 0.6rem; }

@media (max-width: 640px) {
  .section { grid-template-columns: 60px 1fr; }
  .section__d { font-size: 1.3rem; }
  .diff { grid-template-columns: 1fr; }
  .diff__col--final { border-left: 0; border-top: 1px solid var(--line); }
}