/* ==========================================================================
   trigpoint.dev — single stylesheet, no build step, no external assets
   ========================================================================== */

:root {
  --bg:        #0b0e14;
  --bg-alt:    #0e1219;
  --surface:   #121722;
  --surface-2: #161c29;
  --line:      #1f2733;
  --line-soft: #182030;

  --ink:       #e8ecf2;
  --ink-2:     #a3adbc;
  --ink-3:     #66707f;

  --accent:    #45d0a2;   /* brand / healthy signal */
  --accent-dim:#2b8f70;
  --warn:      #e8b44a;   /* anomaly highlight */
  --crit:      #e2606c;

  --sans: ui-sans-serif, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", "JetBrains Mono", Menlo, Consolas, monospace;

  --wrap: 1120px;
  --radius: 10px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: rgba(69, 208, 162, .25); }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 760px; }

h1, h2, h3 { line-height: 1.15; letter-spacing: -0.015em; font-weight: 650; }
h1 { font-size: clamp(2.1rem, 4.6vw, 3.3rem); text-wrap: balance; }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); margin-bottom: .9em; }
h3 { font-size: 1.08rem; }

p { color: var(--ink-2); }
p + p { margin-top: 1em; }
h2 + p { margin-top: 0; }
em { font-style: italic; color: var(--ink); }
strong { color: var(--ink); font-weight: 600; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

.eyebrow {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.1em;
}

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

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid transparent;
  transition: background .25s ease, border-color .25s ease;
}
.nav.scrolled {
  background: rgba(11, 14, 20, .86);
  backdrop-filter: blur(10px);
  border-bottom-color: var(--line-soft);
}
.nav-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 32px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--ink);
}
.brand:hover { text-decoration: none; }
.brand-mark { width: 24px; height: 24px; color: var(--accent); flex: none; }
.brand-word {
  font-family: var(--mono);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--ink);
}
.nav-links {
  display: flex;
  gap: 26px;
  margin-left: auto;
}
.nav-links a {
  color: var(--ink-2);
  font-size: .92rem;
}
.nav-links a:hover { color: var(--ink); text-decoration: none; }

@media (max-width: 720px) {
  .nav-links { display: none; }
  .nav-inner { justify-content: space-between; }
}

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

.btn {
  display: inline-block;
  background: var(--accent);
  color: #08110d;
  font-weight: 600;
  font-size: .95rem;
  padding: 11px 22px;
  border-radius: 7px;
  transition: filter .15s ease, transform .15s ease;
}
.btn:hover { filter: brightness(1.08); text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}
.btn-ghost:hover { border-color: var(--ink-3); filter: none; }
.btn-small { padding: 8px 16px; font-size: .88rem; margin-left: auto; }
.nav-links + .btn-small { margin-left: 0; }

.cta-row { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 1.8em; }

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

.hero {
  position: relative;
  padding: 84px 0 96px;
  overflow: hidden;
}
.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, black 30%, transparent 75%);
  opacity: .5;
  pointer-events: none;
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: 56px;
  align-items: center;
}
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero { padding: 56px 0 72px; }
}
.hero-copy .lede {
  margin-top: 1.2em;
  font-size: 1.13rem;
  max-width: 34em;
}
.hero-facts {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  list-style: none;
  margin-top: 2.4em;
  padding-top: 1.4em;
  border-top: 1px solid var(--line-soft);
}
.hero-facts li {
  font-family: var(--mono);
  font-size: .8rem;
  color: var(--ink-3);
}
.hero-facts strong {
  display: block;
  font-size: 1.15rem;
  color: var(--ink);
  font-weight: 600;
}

/* ------------------------------ alert card ----------------------------- */

.alert-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px 18px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, .45);
  min-width: 0;
}
.alert-head {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--mono);
  font-size: .74rem;
  color: var(--ink-3);
}
.alert-time { margin-left: auto; }
.sev {
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  font-size: .68rem;
  padding: 3px 9px;
  border-radius: 4px;
}
.sev-major {
  color: var(--warn);
  background: rgba(232, 180, 74, .12);
  border: 1px solid rgba(232, 180, 74, .35);
}
.alert-title {
  font-size: 1.12rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-top: 12px;
}
.alert-meta {
  font-family: var(--mono);
  font-size: .75rem;
  color: var(--ink-3);
  margin-top: 4px;
}

.chart-frame { margin: 16px -6px 14px; }
.chart-frame svg { width: 100%; height: auto; display: block; }

.c-grid line { stroke: var(--line-soft); stroke-width: 1; }
.c-axisline { stroke: var(--line); stroke-width: 1; }
.c-axis text {
  font-family: var(--mono);
  font-size: 10px;
  fill: var(--ink-3);
}
.c-band { fill: rgba(69, 208, 162, .10); }
.c-band-label {
  font-family: var(--mono);
  font-size: 10px;
  fill: var(--accent-dim);
}
.c-anom { fill: rgba(232, 180, 74, .07); }
.c-detect {
  stroke: var(--warn);
  stroke-width: 1;
  stroke-dasharray: 3 4;
  opacity: .8;
}
.c-detect-label {
  font-family: var(--mono);
  font-size: 10px;
  fill: var(--warn);
}
.c-line {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2;
  stroke-linejoin: round;
  stroke-linecap: round;
}
.c-series-label {
  font-family: var(--mono);
  font-size: 10px;
  fill: var(--ink-3);
}

.evidence {
  border-top: 1px solid var(--line-soft);
  padding-top: 12px;
  display: grid;
  gap: 5px;
}
.ev-row {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 12px;
  font-family: var(--mono);
  font-size: .76rem;
  line-height: 1.5;
}
.ev-row dt { color: var(--ink-3); text-align: right; }
.ev-row dd { color: var(--ink-2); }
.ev-clean dd::before { content: "✓ "; color: var(--accent-dim); }
.ev-cause dd { color: var(--warn); }
.ev-impact dd { color: var(--ink); }

@media (max-width: 480px) {
  .alert-card { padding: 16px; }
  .ev-row { grid-template-columns: 52px 1fr; gap: 8px; }
}

/* ------------------------------- sections ------------------------------ */

.section { padding: 104px 0; }
.section-tight { padding: 88px 0; }
.section-alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
@media (max-width: 720px) {
  .section, .section-tight { padding: 72px 0; }
}

/* --------------------------------- steps ------------------------------- */

.steps {
  display: grid;
  gap: 56px;
  margin-top: 3em;
  max-width: 800px;
}
.step {
  display: grid;
  grid-template-columns: 64px 1fr;
  column-gap: 24px;
  row-gap: 0;
}
.step > :not(.step-num) { grid-column: 2; }
.step-num {
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--accent);
  border: 1px solid var(--line);
  border-radius: 8px;
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  background: var(--surface);
}
.step h3 { margin-bottom: .5em; font-size: 1.25rem; }
@media (max-width: 560px) {
  .step { grid-template-columns: 1fr; }
  .step > :not(.step-num) { grid-column: 1; }
  .step-num { margin-bottom: 12px; }
}

.mesh-fig {
  margin-top: 22px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 18px 12px;
  max-width: 560px;
}
.mesh-fig svg { width: 100%; height: auto; display: block; }
.mesh-fig figcaption {
  font-family: var(--mono);
  font-size: .72rem;
  color: var(--ink-3);
  text-align: center;
  padding: 8px 0 4px;
}
.m-links line {
  stroke: var(--accent-dim);
  stroke-width: 1.2;
  stroke-dasharray: 4 5;
  opacity: .7;
  animation: meshflow 2.4s linear infinite;
}
@keyframes meshflow { to { stroke-dashoffset: -18; } }
@media (prefers-reduced-motion: reduce) {
  .m-links line { animation: none; }
}
.m-nodes circle {
  fill: var(--bg);
  stroke: var(--accent);
  stroke-width: 1.6;
}
.m-nodes text, .m-rtt text {
  font-family: var(--mono);
  font-size: 11px;
  fill: var(--ink-2);
}
.m-rtt text { fill: var(--ink-3); font-size: 10px; }

/* ------------------------------- features ------------------------------ */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 3em;
}
@media (max-width: 980px) { .feature-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .feature-grid { grid-template-columns: 1fr; } }

.feature {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 22px;
}
.f-icon {
  width: 26px;
  height: 26px;
  color: var(--accent);
  margin-bottom: 14px;
}
.feature h3 { margin-bottom: .5em; }
.feature p { font-size: .92rem; color: var(--ink-2); }

/* ---------------------------- alert anatomy ---------------------------- */

.anatomy {
  margin: 1.6em 0 1.6em 1.2em;
  display: grid;
  gap: .85em;
}
.anatomy li { color: var(--ink-2); padding-left: .4em; }
.anatomy li::marker {
  font-family: var(--mono);
  color: var(--accent);
  font-size: .9em;
}

/* -------------------------------- modules ------------------------------ */

.modules {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 3em;
}
@media (max-width: 860px) { .modules { grid-template-columns: 1fr; } }
.module {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px;
  border-top: 2px solid var(--accent-dim);
}
.module h3 { font-size: 1.2rem; }
.module-q {
  font-style: italic;
  color: var(--ink);
  margin: .8em 0;
  font-size: .95rem;
}
.module p:last-child { font-size: .92rem; }

/* --------------------------- measurement planes ------------------------ */

.planes-lede { max-width: 62ch; }
.planes {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 2.6em 0;
}
@media (max-width: 900px) { .planes { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .planes { grid-template-columns: 1fr; } }
.plane {
  background: var(--surface);
  border: 1px solid var(--line);
  border-top: 2px solid var(--accent-dim);
  border-radius: var(--radius);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
}
.plane h3 { font-size: 1.05rem; margin-bottom: .55em; }
.plane-how { font-size: .9rem; color: var(--ink-2); }
.plane-rate {
  font-family: var(--mono);
  font-size: .72rem;
  line-height: 1.5;
  color: var(--ink-3);
  margin-top: auto;
  padding-top: 1em;
}

/* ------------------------------ architecture --------------------------- */

.arch {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  gap: 14px;
  align-items: start;
  margin-top: 3em;
}
@media (max-width: 980px) {
  .arch { grid-template-columns: 1fr; }
  .arch-arrow { transform: rotate(90deg); justify-self: center; margin: 2px 0; }
}
.arch-col { display: grid; gap: 10px; min-width: 0; }
.arch-label {
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding-bottom: 2px;
}
.arch-box {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
}
.arch-box strong {
  display: block;
  font-size: .9rem;
  margin-bottom: 2px;
}
.arch-box span {
  font-family: var(--mono);
  font-size: .68rem;
  line-height: 1.55;
  color: var(--ink-3);
  display: block;
}
.arch-agent { border-left: 2px solid var(--accent-dim); }
.arch-db { border-left: 2px solid var(--warn); }
.arch-ctx { border-style: dashed; }
.arch-faded { opacity: .6; }
.arch-arrow {
  align-self: center;
  display: grid;
  justify-items: center;
  gap: 2px;
  color: var(--ink-3);
  font-family: var(--mono);
  font-size: .66rem;
  padding-top: 20px;
}
.arch-arrow svg { width: 34px; height: 11px; }
.arch-arrow-sub { color: var(--ink-3); opacity: .7; }

.arch-notes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 40px;
}
@media (max-width: 860px) { .arch-notes { grid-template-columns: 1fr; } }
.arch-note {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 22px;
  background: var(--surface);
}
.arch-note h3 { margin-bottom: .5em; }
.arch-note p { font-size: .92rem; }

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

.footer {
  border-top: 1px solid var(--line-soft);
  padding: 56px 0 48px;
  background: var(--bg-alt);
}
.footer-inner { display: grid; gap: 22px; }
.footer-brand {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.footer-brand .brand-mark { width: 26px; height: 26px; color: var(--accent); margin-top: 2px; }
.footer-tag { font-size: .88rem; color: var(--ink-3); margin-top: 2px; }
.footer-name {
  font-size: .88rem;
  color: var(--ink-3);
  max-width: 560px;
}
.footer-fine {
  font-family: var(--mono);
  font-size: .74rem;
  color: var(--ink-3);
  padding-top: 10px;
  border-top: 1px solid var(--line-soft);
}
.footer-fine a { color: var(--ink-3); }
.footer-fine a:hover { color: var(--accent); }

/* -------------------------------- reveal ------------------------------- */

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .55s ease, transform .55s ease;
}
.reveal.in { opacity: 1; transform: none; }