/* Sentinel landing page
   Type: Big Shoulders Display (headlines) / IBM Plex Sans (body) / IBM Plex Mono (data) */

:root {
  --bg: #10151c;
  --bg-raised: #171f29;
  --bg-inset: #0b0f14;
  --border: #2b3542;
  --border-soft: #202a35;
  --ink: #e8edf2;
  --ink-dim: #8b98a9;
  --ink-faint: #5b6675;
  --accent: #e8a33d;
  --accent-strong: #f5b94f;
  --accent-ink: #241a08;
  --safe: #4fb894;
  --harm: #e2564f;
  --radius: 10px;
  --measure: 640px;
}

:root[data-theme="light"] {
  --bg: #eef1f3;
  --bg-raised: #ffffff;
  --bg-inset: #e2e7ea;
  --border: #d6dce1;
  --border-soft: #dde2e6;
  --ink: #131a22;
  --ink-dim: #566270;
  --ink-faint: #838f9c;
  --accent: #9c6118;
  --accent-strong: #7d4d13;
  --accent-ink: #fff6e6;
  --safe: #2f8567;
  --harm: #c43d36;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #eef1f3;
    --bg-raised: #ffffff;
    --bg-inset: #e2e7ea;
    --border: #d6dce1;
    --border-soft: #dde2e6;
    --ink: #131a22;
    --ink-dim: #566270;
    --ink-faint: #838f9c;
    --accent: #9c6118;
    --accent-strong: #7d4d13;
    --accent-ink: #fff6e6;
    --safe: #2f8567;
    --harm: #c43d36;
  }
}

* { box-sizing: border-box; }

html { color-scheme: dark light; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

/* ---------- Horizontal scroll (signal chain, code blocks, service table) ---------- */

.chain, .code-block, pre.code, .service-table-wrap {
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.chain::-webkit-scrollbar,
.code-block::-webkit-scrollbar,
pre.code::-webkit-scrollbar,
.service-table-wrap::-webkit-scrollbar {
  height: 6px;
}
.chain::-webkit-scrollbar-track,
.code-block::-webkit-scrollbar-track,
pre.code::-webkit-scrollbar-track,
.service-table-wrap::-webkit-scrollbar-track {
  background: transparent;
}
.chain::-webkit-scrollbar-thumb,
.code-block::-webkit-scrollbar-thumb,
pre.code::-webkit-scrollbar-thumb,
.service-table-wrap::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 100px;
}
.chain:hover::-webkit-scrollbar-thumb,
.code-block:hover::-webkit-scrollbar-thumb,
pre.code:hover::-webkit-scrollbar-thumb,
.service-table-wrap:hover::-webkit-scrollbar-thumb {
  background: var(--ink-faint);
}
.chain::-webkit-scrollbar-thumb:hover,
.code-block::-webkit-scrollbar-thumb:hover,
pre.code::-webkit-scrollbar-thumb:hover,
.service-table-wrap::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

a { color: var(--accent); }
a:focus-visible, button:focus-visible, .btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.mono {
  font-family: "IBM Plex Mono", ui-monospace, "Cascadia Code", monospace;
  font-variant-numeric: tabular-nums;
}

h1, h2, h3, .display {
  font-family: "Big Shoulders Display", "Arial Narrow", sans-serif;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  text-wrap: balance;
  color: var(--ink);
  margin: 0;
}

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 32px;
}

.prose { max-width: var(--measure); }

.eyebrow {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 10px;
}

.eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent);
  flex: none;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px 32px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-soft);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: "Big Shoulders Display", sans-serif;
  font-weight: 700;
  font-size: 1.3rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink);
  text-decoration: none;
}

.brand img { height: 28px; width: 28px; object-fit: contain; border-radius: 6px; }

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 0.86rem;
}

.site-nav a {
  color: var(--ink-dim);
  text-decoration: none;
}
.site-nav a:hover { color: var(--ink); }

.site-nav .btn { font-size: 0.82rem; padding: 8px 16px; }

.theme-toggle {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--ink-dim);
  border-radius: 7px;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  cursor: pointer;
  font-size: 0.9rem;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--ink-faint); }

@media (max-width: 760px) {
  .site-nav a:not(.btn):not(.theme-toggle) { display: none; }
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 7px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.88rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
}
.btn-primary:hover { background: var(--accent-strong); }

.btn-ghost {
  border-color: var(--border);
  color: var(--ink);
}
.btn-ghost:hover { border-color: var(--ink-faint); }

/* ---------- Hero ---------- */

.hero {
  position: relative;
  padding: 96px 32px 72px;
  overflow: hidden;
  border-bottom: 1px solid var(--border-soft);
}

.hero-scope {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.65;
}

:root[data-theme="light"] .hero-scope { opacity: 0.4; }
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .hero-scope { opacity: 0.4; }
}

.hero-inner {
  position: relative;
  max-width: 1120px;
  margin: 0 auto;
}

.hero h1 {
  font-size: clamp(3rem, 8vw, 6.4rem);
  line-height: 0.92;
  margin: 22px 0 20px;
}

.hero h1 span { color: var(--accent); }

.hero-sub {
  max-width: 560px;
  color: var(--ink-dim);
  font-size: 1.08rem;
  margin: 0 0 34px;
}

.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 44px; }

.status-strip {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 22px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.78rem;
  color: var(--ink-faint);
  padding-top: 22px;
  border-top: 1px solid var(--border-soft);
}

.status-strip .dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; margin-right: 7px; }
.dot-safe { background: var(--safe); }
.dot-harm { background: var(--harm); }
.dot-accent { background: var(--accent); }

/* ---------- Impact strip ---------- */

#impact { padding: 56px 32px 64px; background: var(--bg-raised); }

.impact-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.impact-note {
  margin: 0;
  color: var(--ink-dim);
  font-size: 0.88rem;
  max-width: 480px;
}

.impact-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}

.impact-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 4px 28px;
  border-left: 1px solid var(--border);
}
.impact-stat:first-child { padding-left: 0; border-left: none; }

.impact-num {
  font-family: "Big Shoulders Display", sans-serif;
  font-weight: 800;
  font-size: clamp(2.4rem, 4vw, 3.4rem);
  line-height: 1;
  color: var(--accent);
}
.impact-num small { font-size: 0.5em; font-weight: 700; margin-left: 1px; }

.impact-label {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--ink);
}

.impact-ctx {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  color: var(--ink-faint);
  line-height: 1.5;
}

@media (max-width: 860px) {
  .impact-strip { grid-template-columns: repeat(2, 1fr); row-gap: 28px; }
  .impact-stat:nth-child(2) { border-left: 1px solid var(--border); }
  .impact-stat:nth-child(3) { padding-left: 0; border-left: none; }
}
@media (max-width: 520px) {
  .impact-strip { grid-template-columns: 1fr; }
  .impact-stat { border-left: none !important; padding-left: 0; padding-right: 0; border-top: 1px solid var(--border); padding-top: 20px; }
  .impact-stat:first-child { border-top: none; padding-top: 4px; }
}

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

section { padding: 88px 32px; border-bottom: 1px solid var(--border-soft); }
section:last-of-type { border-bottom: none; }

.section-head { margin-bottom: 48px; max-width: var(--measure); }
.section-head .eyebrow { margin-bottom: 14px; }
.section-head h2 { font-size: clamp(2rem, 4vw, 2.8rem); margin-bottom: 14px; }
.section-head p { color: var(--ink-dim); margin: 0; }

/* ---------- Signal chain (data flow) ---------- */

.chain {
  display: flex;
  align-items: stretch;
  gap: 0;
  overflow-x: auto;
  padding-bottom: 12px;
}

.chain-node {
  flex: 1 0 168px;
  min-width: 168px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 16px;
  position: relative;
}

.chain-node .n {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.68rem;
  color: var(--accent);
  letter-spacing: 0.1em;
}

.chain-node h3 {
  font-size: 1.02rem;
  text-transform: none;
  letter-spacing: 0;
  font-weight: 600;
  margin: 8px 0 6px;
  font-family: "IBM Plex Sans", sans-serif;
}

.chain-node p { margin: 0; font-size: 0.82rem; color: var(--ink-dim); }

.chain-arrow {
  flex: 0 0 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-faint);
  font-family: "IBM Plex Mono", monospace;
}

.chain-branch {
  flex-basis: 100%;
  margin-top: -1px;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  font-size: 0.82rem;
  color: var(--ink-dim);
  display: flex;
  gap: 10px;
  align-items: baseline;
}
.chain-branch strong { color: var(--ink); font-weight: 600; }

@media (max-width: 900px) {
  .chain { flex-direction: column; }
  .chain-arrow { transform: rotate(90deg); padding: 4px 0; }
}

/* ---------- Demo frame ---------- */

.scope-frame {
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 14px;
  box-shadow: inset 0 0 0 1px var(--border-soft), 0 30px 60px -30px rgba(0,0,0,0.5);
}

.scope-frame .bezel-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 8px 14px;
}

.bezel-bar .led {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--harm);
  box-shadow: 0 0 8px var(--harm);
}

.bezel-bar span {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.7rem;
  color: var(--ink-faint);
  letter-spacing: 0.08em;
}

.scope-frame img {
  width: 100%;
  display: block;
  border-radius: 8px;
  border: 1px solid var(--border-soft);
}

/* ---------- Phase board ---------- */

.board { display: flex; flex-direction: column; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }

.board-row {
  display: grid;
  grid-template-columns: 56px 1fr 1.4fr 130px;
  gap: 16px;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-soft);
  background: var(--bg-raised);
}
.board-row:last-child { border-bottom: none; }
.board-row.head {
  background: transparent;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding: 0 20px 10px;
  border-bottom: none;
}

.board-row .idx { font-family: "IBM Plex Mono", monospace; color: var(--ink-faint); font-size: 0.85rem; }
.board-row .what { font-weight: 600; font-size: 0.95rem; }
.board-row .tools { color: var(--ink-dim); font-size: 0.85rem; }

.pill {
  justify-self: start;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  padding: 4px 10px;
  border-radius: 100px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}
.pill::before { content: ""; width: 6px; height: 6px; border-radius: 50%; }

.pill-done { color: var(--safe); background: color-mix(in srgb, var(--safe) 14%, transparent); }
.pill-done::before { background: var(--safe); }

.pill-pending { color: var(--ink-faint); background: color-mix(in srgb, var(--ink-faint) 12%, transparent); }
.pill-pending::before { background: var(--ink-faint); }

@media (max-width: 700px) {
  .board-row { grid-template-columns: 40px 1fr; }
  .board-row .tools, .board-row.head .tools-h { display: none; }
  .board-row .pill { grid-column: 2; }
}

/* ---------- Setup ---------- */

.setup-steps { display: flex; flex-direction: column; gap: 28px; max-width: 760px; }

.step {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 18px;
}

.step .num {
  font-family: "Big Shoulders Display", sans-serif;
  font-size: 1.8rem;
  color: var(--accent);
  line-height: 1;
}

.step h3 {
  font-family: "IBM Plex Sans", sans-serif;
  text-transform: none;
  letter-spacing: 0;
  font-size: 1.08rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.step p { margin: 0 0 12px; color: var(--ink-dim); font-size: 0.92rem; }

pre.code, .code-block {
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  overflow-x: auto;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--ink);
  margin: 0;
}
.code-block .c { color: var(--ink-faint); }
.code-block .s { color: var(--safe); }

.prereqs {
  list-style: none;
  padding: 0;
  margin: 0 0 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.prereqs li {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.78rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 10px;
  color: var(--ink-dim);
}

.service-table-wrap { overflow-x: auto; margin-top: 8px; padding-bottom: 8px; }
table.svc {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.86rem;
  min-width: 480px;
}
table.svc th, table.svc td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-soft);
}
table.svc th {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 500;
}
table.svc td.mono { color: var(--ink); }
table.svc td.dim { color: var(--ink-dim); }

/* ---------- Metrics grid ---------- */

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
@media (max-width: 860px) { .metric-grid { grid-template-columns: 1fr; } }

.panel {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 24px 22px;
}

.panel h3 {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 16px;
  font-weight: 500;
}

.panel table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
.panel table th, .panel table td {
  text-align: left;
  padding: 8px 6px;
  border-bottom: 1px solid var(--border-soft);
}
.panel table th {
  color: var(--ink-faint);
  font-weight: 500;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.panel table td:not(:first-child), .panel table th:not(:first-child) { text-align: right; }
.panel table tr:last-child td { border-bottom: none; }

.stat-row { display: flex; justify-content: space-between; align-items: baseline; padding: 9px 0; border-bottom: 1px solid var(--border-soft); }
.stat-row:last-child { border-bottom: none; }
.stat-row .k { color: var(--ink-dim); font-size: 0.86rem; }
.stat-row .v { font-family: "IBM Plex Mono", monospace; font-size: 0.92rem; color: var(--ink); }
.stat-row .v.accent { color: var(--accent); }

.callout {
  margin-top: 16px;
  padding: 12px 14px;
  border-left: 3px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
  font-size: 0.82rem;
  color: var(--ink-dim);
  border-radius: 0 6px 6px 0;
}
.callout strong { color: var(--ink); }

.metric-list { list-style: none; margin: 0; padding: 0; }
.metric-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--border-soft);
}
.metric-list li:last-child { border-bottom: none; }
.metric-list code {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
  color: var(--accent);
  display: block;
  margin-bottom: 3px;
}
.metric-list span { font-size: 0.82rem; color: var(--ink-dim); }

.gate-threshold {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 14px;
}
.gate-threshold .big {
  font-family: "Big Shoulders Display", sans-serif;
  font-size: 2.6rem;
  color: var(--harm);
  line-height: 1;
}
.gate-threshold .lbl { color: var(--ink-dim); font-size: 0.85rem; }

/* ---------- Stack ---------- */

.stack-groups { display: flex; flex-direction: column; gap: 18px; }
.stack-row { display: grid; grid-template-columns: 160px 1fr; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--border-soft); }
.stack-row:last-child { border-bottom: none; }
.stack-row .concern { font-family: "IBM Plex Mono", monospace; font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-faint); padding-top: 4px; }
.stack-row .tools { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 0.84rem;
  color: var(--ink);
  background: var(--bg-raised);
}
@media (max-width: 640px) { .stack-row { grid-template-columns: 1fr; } }

/* ---------- Contact ---------- */

.contact-links { display: flex; gap: 14px; flex-wrap: wrap; }
.contact-links a {
  padding: 10px 22px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--ink);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}
.contact-links a:hover {
  color: var(--accent-ink);
  background: var(--accent);
  border-color: var(--accent);
}

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

footer {
  padding: 40px 32px 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
footer .footer-row { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
footer .footer-contact { padding-top: 20px; border-top: 1px solid var(--border-soft); }
footer .fmark { font-family: "Big Shoulders Display", sans-serif; text-transform: uppercase; font-weight: 700; color: var(--ink-dim); font-size: 0.95rem; }
footer .fauthor { color: var(--ink-dim); font-size: 0.86rem; }
footer .flinks { display: flex; gap: 10px; flex-wrap: wrap; }
footer .flinks a {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--ink-dim);
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 600;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}
footer .flinks a:hover {
  color: var(--accent-ink);
  background: var(--accent);
  border-color: var(--accent);
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}