/* ============================================================
   MANTIS — minimal deeptech landing
   white / black / #3763C8
   ============================================================ */

:root {
  --paper: #FFFFFF;
  --ink: #0A0A0A;
  --ink-soft: #5C5C5C;
  --blue: #3763C8;
  --hairline: rgba(10, 10, 10, 0.14);
  --hairline-inv: rgba(255, 255, 255, 0.18);
  --sans: "Geist", -apple-system, "Helvetica Neue", Arial, sans-serif;
  --mono: "Geist Mono", ui-monospace, monospace;
  --measure: 60ch;
  --radius: 3px;
}

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

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

body {
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(55, 99, 200, 0.18); }

a { color: var(--blue); text-decoration-thickness: 1px; text-underline-offset: 3px; }

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
  border-radius: 1px;
}

img { max-width: 100%; }

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

.btn {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.92rem;
  font-weight: 500;
  padding: 0.7rem 1.6rem;
  color: #fff;
  background: var(--ink);
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s;
}

.btn:hover { background: var(--blue); border-color: var(--blue); color: #fff; }

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: rgba(10, 10, 10, 0.4);
}

.btn-ghost:hover { background: transparent; color: var(--blue); border-color: var(--blue); }

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

.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  overflow: hidden;
  border-bottom: 1px solid var(--hairline);
  /* the graph paper is the backdrop of the whole hero */
  background-image:
    linear-gradient(rgba(55, 99, 200, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(55, 99, 200, 0.06) 1px, transparent 1px);
  background-size: 44px 44px;
}

.hero-bg { position: absolute; inset: 0; z-index: 0; }

/* soft white wash so the headline stays readable over the figure */
.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg,
    rgba(255, 255, 255, 0.88) 0%,
    rgba(255, 255, 255, 0.55) 38%,
    rgba(255, 255, 255, 0) 64%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  flex: 1;
  display: flex;
  flex-direction: column;
  max-width: 1080px;
  width: 100%;
  margin: 0 auto;
  padding: clamp(2.5rem, 6vh, 4rem) clamp(1.25rem, 4vw, 3rem) 2.5rem;
}

.hero-caption {
  margin-top: auto;
  padding-top: 4rem;
  font-family: var(--mono);
  font-size: 0.76rem;
  line-height: 1.6;
  color: var(--ink-soft);
  max-width: 58ch;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  margin-bottom: clamp(3.5rem, 9vh, 6rem);
}

.brand-mark {
  display: block;
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
}

.brand-text { display: flex; flex-direction: column; gap: 0.1rem; }

.brand-name {
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.01em;
  line-height: 1.1;
}

.brand-line {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.hero h1 {
  font-weight: 600;
  font-size: clamp(2.2rem, 5vw, 3.9rem);
  line-height: 1.06;
  letter-spacing: -0.03em;
  max-width: 21ch;
  margin-bottom: 1.5rem;
}

.lede {
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  line-height: 1.55;
  max-width: 52ch;
  color: var(--ink-soft);
}

#chart { position: absolute; inset: 0; }
#chart canvas { display: block; }

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

.section {
  max-width: 1080px;
  margin: 0 auto;
  padding: clamp(4.5rem, 11vh, 8rem) clamp(1.25rem, 4vw, 3rem) 0;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 1rem;
}

.section h2, .section-dark h2 {
  font-weight: 600;
  font-size: clamp(1.6rem, 3.2vw, 2.4rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  max-width: 26ch;
  margin-bottom: 1.5rem;
}

.prose { max-width: var(--measure); }
.prose p + p { margin-top: 1.1rem; }

.coda {
  margin-top: 2.5rem;
  padding-left: 1.25rem;
  border-left: 2px solid var(--blue);
  color: var(--ink-soft);
}

/* ---------- stats ---------- */

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 3rem;
}

.stat {
  border-top: 1px solid var(--ink);
  padding-top: 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.stat-value {
  font-weight: 600;
  font-size: clamp(1.7rem, 2.8vw, 2.3rem);
  letter-spacing: -0.02em;
  line-height: 1;
}

.stat-label { font-size: 0.92rem; color: var(--ink-soft); max-width: 28ch; }

/* ---------- regimes ---------- */

.regimes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}

.regime {
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  overflow: hidden;
}

.regime-trace {
  display: block;
  width: 100%;
  height: 88px;
  border-bottom: 1px solid var(--hairline);
}

.regime-trace path {
  fill: none;
  stroke: var(--ink);
  stroke-width: 1.5;
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  transition: stroke-dashoffset 1.4s ease-out;
}
.regime.drawn .regime-trace path { stroke-dashoffset: 0; }
@media (prefers-reduced-motion: reduce) {
  .regime-trace path { stroke-dasharray: none; stroke-dashoffset: 0; transition: none; }
}

.regime-body { padding: 1.1rem 1.25rem 1.3rem; }

.regime h3 {
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.verdict {
  font-family: var(--mono);
  font-weight: 400;
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius);
}

.verdict-target { color: var(--blue); border: 1px solid rgba(55, 99, 200, 0.4); }
.verdict-future { color: var(--blue); border: 1px dashed rgba(55, 99, 200, 0.55); }

.regime-body p { font-size: 0.9rem; line-height: 1.55; color: var(--ink-soft); }

/* ---------- flow strip ---------- */

.flow {
  display: flex;
  align-items: stretch;
  gap: 1rem;
  margin-top: 3rem;
}

.flow-node {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.25rem;
  padding: 1.25rem 1.4rem;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  text-align: center;
}

.flow-node-solid { background: var(--ink); color: #fff; }

.flow-title { font-weight: 600; font-size: 1rem; letter-spacing: -0.01em; }

.flow-sub { font-family: var(--mono); font-size: 0.72rem; color: var(--ink-soft); }
.flow-node-solid .flow-sub { color: rgba(255, 255, 255, 0.75); }

.flow-arrow {
  align-self: center;
  font-size: 1.4rem;
  color: var(--ink-soft);
}
.flow-arrow-blue { color: var(--blue); }

.flow-note {
  font-size: 0.95rem;
  color: var(--ink-soft);
  margin-top: 1.25rem;
  max-width: var(--measure);
}

/* ---------- applications (dark band) ---------- */

.section-dark {
  background: var(--ink);
  color: #fff;
  margin-top: clamp(4.5rem, 11vh, 8rem);
  padding: clamp(4.5rem, 11vh, 7rem) 0;
}

.dark-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 3rem);
}

.eyebrow-dark { color: #7B9BE8; }

.prose-dark { color: rgba(255, 255, 255, 0.65); }

.apps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--hairline-inv);
  border-left: 1px solid var(--hairline-inv);
  margin-top: 3rem;
}

.app {
  padding: 1.4rem 1.4rem 1.6rem;
  border-right: 1px solid var(--hairline-inv);
  border-bottom: 1px solid var(--hairline-inv);
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  transition: background 0.15s;
}

.app:hover { background: rgba(55, 99, 200, 0.12); }

.app-id {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.09em;
  color: #7B9BE8;
}

.app h3 {
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: -0.01em;
  line-height: 1.25;
}

.app p {
  font-size: 0.86rem;
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.6);
}

/* ---------- references ---------- */

.references {
  list-style: none;
  counter-reset: ref;
  margin-top: 2.5rem;
  border-top: 1px solid var(--ink);
}

.references li {
  counter-increment: ref;
  display: grid;
  grid-template-columns: 2.6rem 1fr auto;
  align-items: baseline;
  gap: 0.5rem 1rem;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--hairline);
}

.references li::before {
  content: "0" counter(ref);
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--blue);
}

.references li p { max-width: 56ch; }

.ref-cite {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-soft);
  white-space: nowrap;
}

/* ---------- contact ---------- */

.section-contact { padding-bottom: 7rem; }

.contact-row {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 2.25rem;
}

.contact-addr { font-family: var(--mono); font-size: 0.85rem; color: var(--ink-soft); }

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

.site-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  max-width: 1080px;
  margin: 0 auto;
  padding: 1.5rem clamp(1.25rem, 4vw, 3rem);
  border-top: 1px solid var(--hairline);
  font-size: 0.82rem;
  color: var(--ink-soft);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 500;
  color: var(--ink);
}

.footer-brand img { display: block; border-radius: 2px; }

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

@media (max-width: 1000px) {
  .apps { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 860px) {
  .stats { grid-template-columns: 1fr; gap: 1.5rem; }
  .regimes { grid-template-columns: 1fr; }
  .flow { flex-direction: column; }
  .flow-arrow { transform: rotate(90deg); }
  .references li {
    grid-template-columns: 2.2rem 1fr;
  }
  .ref-cite { grid-column: 2; white-space: normal; }
}

@media (max-width: 720px) {
  .hero-bg::after {
    background: linear-gradient(180deg,
      rgba(255, 255, 255, 0.85) 0%,
      rgba(255, 255, 255, 0.55) 42%,
      rgba(255, 255, 255, 0.12) 75%);
  }
}

@media (max-width: 560px) {
  .apps { grid-template-columns: 1fr; }
}