/* ==========================================================
   Sughero Systems — landing page
   Warm white / graphite / charcoal, deep cobalt accent.
   Editorial typography. Calm motion.
   ========================================================== */

:root {
  --bg: #FAF8F5;
  --ink: #17191E;
  --graphite: #4B4F58;
  --faint: #6E7178;
  --hairline: #E6E2DB;
  --accent: #1F3FA8;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --measure: 38rem;
}

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

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: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---------- Layout shell ---------- */

.site-header,
.hero,
.section,
.site-footer {
  max-width: 62rem;
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 5vw, 3rem);
}

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

.site-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-block: 1.75rem;
}

.wordmark {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.0625rem;
  letter-spacing: 0.01em;
}

.site-header nav a {
  color: var(--graphite);
  text-decoration: none;
  font-size: 0.875rem;
  margin-left: 1.75rem;
  transition: color 160ms ease;
}
.site-header nav a:hover,
.site-header nav a:focus-visible { color: var(--ink); }

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

.hero { padding-block: clamp(5rem, 14vh, 9rem) clamp(4rem, 10vh, 7rem); }

.kicker {
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

h1 {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(2.375rem, 6vw, 4.25rem);
  line-height: 1.12;
  letter-spacing: -0.015em;
  max-width: 20ch;
}

.lede {
  margin-top: 2rem;
  max-width: var(--measure);
  font-size: 1.1875rem;
  color: var(--graphite);
}

.hero-actions {
  margin-top: 2.75rem;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.button {
  display: inline-block;
  padding: 0.75rem 1.625rem;
  border: 1px solid var(--ink);
  color: var(--ink);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease;
}
.button:hover,
.button:focus-visible {
  background: var(--ink);
  color: var(--bg);
}

.link-quiet {
  color: var(--graphite);
  text-decoration: none;
  font-size: 0.9375rem;
  border-bottom: 1px solid var(--hairline);
  transition: color 160ms ease, border-color 160ms ease;
}
.link-quiet:hover,
.link-quiet:focus-visible { color: var(--accent); border-color: var(--accent); }

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

.section {
  padding-block: clamp(4rem, 10vh, 7rem);
  border-top: 1px solid var(--hairline);
}

.section-label {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 2rem;
}

h2 {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(1.75rem, 3.6vw, 2.625rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  max-width: 24ch;
  margin-bottom: 1.75rem;
}

.prose { max-width: var(--measure); color: var(--graphite); }
.prose p + p { margin-top: 1.25rem; }

/* ---------- Why it matters: progression ---------- */

.progression {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-block: 2.5rem;
}

.progression-step {
  border-top: 2px solid var(--ink);
  padding-top: 1rem;
}
.progression-step:last-child { border-top-color: var(--accent); }

.progression-era {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 0.5rem;
}

.progression-step p {
  font-family: var(--serif);
  font-size: 1.125rem;
  line-height: 1.4;
}

/* ---------- Diagram ---------- */

.diagram { margin-top: 3.5rem; max-width: 40rem; }
.diagram svg { width: 100%; height: auto; display: block; }

.d-line    { stroke: var(--ink); stroke-width: 1.25; }
.d-node    { fill: var(--bg); stroke: var(--ink); stroke-width: 1.5; }
.d-arc     { stroke: var(--accent); stroke-width: 1.25; stroke-dasharray: 4 5; }
.d-accent  { fill: var(--accent); }
.d-observe { stroke: var(--faint); stroke-width: 0.75; stroke-dasharray: 2 4; }
.d-label   { font-family: var(--sans); font-size: 11px; fill: var(--faint); letter-spacing: 0.08em; }

.diagram figcaption {
  margin-top: 1rem;
  font-size: 0.8125rem;
  color: var(--faint);
}

/* ---------- Principles ---------- */

.principles {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem 3.5rem;
  max-width: 52rem;
}

.principles dt {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.1875rem;
  margin-bottom: 0.375rem;
}

.principles dd { color: var(--graphite); font-size: 0.9375rem; }

/* ---------- Portrait ---------- */

.portrait { margin-top: 3.5rem; }

.portrait img {
  display: block;
  width: min(100%, 26rem);
  height: auto;
  filter: grayscale(100%);
}

.portrait-name {
  margin-top: 1.5rem;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.1875rem;
}

.portrait-role {
  color: var(--faint);
  font-size: 0.875rem;
  margin-top: 0.125rem;
}

/* ---------- Status ---------- */

.status {
  list-style: none;
  max-width: var(--measure);
}

.status li {
  padding-block: 1rem;
  border-bottom: 1px solid var(--hairline);
  color: var(--graphite);
  display: flex;
  align-items: center;
  gap: 0.875rem;
}

.status li::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex: none;
}

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

.contact-link {
  font-family: var(--serif);
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--hairline);
  transition: color 160ms ease, border-color 160ms ease;
}
.contact-link:hover,
.contact-link:focus-visible { color: var(--accent); border-color: var(--accent); }

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

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding-block: 2.5rem;
  border-top: 1px solid var(--hairline);
  font-size: 0.8125rem;
  color: var(--faint);
}

/* ---------- Motion ---------- */

.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 600ms ease, transform 600ms ease;
}
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- Responsive ---------- */

@media (max-width: 700px) {
  .progression { grid-template-columns: 1fr; gap: 1.5rem; }
  .principles { grid-template-columns: 1fr; gap: 1.75rem; }
  .site-header nav a { margin-left: 1.125rem; }
}