:root {
  color-scheme: dark;
  --bg-dark: #20202d;
  --bg-gradient: radial-gradient(circle at 20% 55vh, #2c2c3a 0%, #12121a 1000px);
  --content-inner-gradient: radial-gradient(circle at 20% 55vh, #2c2c3aa1 0%, #12121a 1000px);
  --text-light: #f4efe2;
  --text-muted: rgba(244, 239, 226, 0.7);
  --text-faint: rgba(244, 239, 226, 0.5);
  --text-dim: rgba(244, 239, 226, 0.65);
  --text-strong: rgba(244, 239, 226, 0.85);
  --accent: #eaa01c;
  --accent-soft: rgba(234, 160, 28, 0.65);
  --accent-glow: rgba(234, 160, 28, 0.35);

  --accent-bright: rgba(234, 160, 28, 0.95);
  --accent-dark: rgba(128, 72, 10, 0.9);
  --accent-faint: rgba(234, 160, 28, 0.20);
  --accent-text: #1a1208;
  --surface-glass: rgba(32, 32, 45, 0.85);
  --surface-veil: rgba(44, 32, 25, 0.6);
  --surface-medium: rgba(52, 50, 64, 0.9);
  --surface-dark-subtle: rgba(18, 18, 26, 0.4);
  --shadow-strong: rgba(16, 16, 24, 0.65);
  --shadow-soft: rgba(16, 16, 24, 0.45);
  --shadow-deep: rgba(10, 8, 20, 0.55);

  --button-shadow: rgba(234, 160, 28, 0.25);
}

/*  site.css — Shared styles loaded on ALL pages.
 *  Only add rules here if they genuinely apply to both marketing and blog.
 *  Homepage-only → home.css | Blog-only → article.css
 */

* {
  box-sizing: border-box;
}

html {
  overflow-x: clip;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg-gradient);
  color: var(--text-light);
}

a {
  color: inherit;
  text-decoration: none;
}

.page-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.site-header {
  position: relative;
  z-index: 10;
  padding: 1.5rem clamp(1.5rem, 4vw, 3.5rem);
  background: transparent;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin: 0 auto;
  max-width: 1200px;
  width: 100%;
  padding: 0.85rem 1.75rem;
  border-radius: 25px;
  border: 1px solid var(--accent-glow);
  background: var(--surface-glass);
  box-shadow: 0 18px 48px var(--shadow-strong);
  backdrop-filter: blur(18px);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.28em;
  font-weight: 600;
  font-size: 0.78rem;
  color: var(--text-strong);
}

.site-header__logo-mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 15px;
  background: linear-gradient(140deg, rgba(234, 160, 28, 0.9), rgba(60, 42, 20, 0.95));
  color: #1a1208;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav__link {
  font-size: 0.86rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.24em;
  color: var(--text-faint);
  transition: color 0.25s ease;
  padding: 0.75rem 0.5rem;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.site-nav__link:hover,
.site-nav__link.is-active {
  color: var(--accent);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.75rem 1.65rem;
  border-radius: 17px;
  border: 1px solid var(--accent-glow);
  background: rgba(32, 32, 45, 0.75);
  color: var(--text-strong);
  text-transform: uppercase;
  letter-spacing: 0.26em;
  font-size: 0.75rem;
  font-weight: 600;
  transition: transform 0.1s ease, box-shadow 0.1s ease, background 0.1s ease, color 0.1s ease;
}

.button:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 32px var(--shadow-soft);
  background: var(--surface-medium);
  color: var(--text-light);
}

.button--primary {
  background: linear-gradient(145deg, var(--accent-bright), var(--accent-dark));
  border-color: transparent;
  color: #000000;
  box-shadow: 1px 5px 50px var(--button-shadow);
}

.button--primary:hover {
  background: linear-gradient(145deg, rgba(244, 177, 60, 1), rgba(128, 72, 10, 0.95));
  transform: translateY(-2px);
}

.button--ghost {
  background: transparent;
  border-color: rgba(244, 239, 226, 0.25);
  color: rgba(244, 239, 226, 0.75);
}

.button--ghost:hover {
  background: rgba(52, 50, 64, 0.6);
}

.site-header__logo {
  height: 28px;
  width: auto;
  display: block;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
}

.content-section .hero-actions {
  margin-top: 1.5rem;
}

.three-viewer {
  aspect-ratio: 1 / 1;
  margin: 0 auto;
  display: block;
}

.three-viewer canvas {
  width: 100%;
  height: 100%;
  display: block;
}

@media (max-width: 1024px) {
  .site-header__inner {
    border-radius: 32px;
  }
}

.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-light);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
  line-height: 1;
}

.mobile-menu-toggle:hover {
  color: var(--accent);
}

@media (max-width: 768px) {
  .site-header {
    padding: 1rem clamp(1rem, 5vw, 2rem);
  }

  .site-header__inner {
    flex-direction: row;
    align-items: center;
    gap: 1.25rem;
  }

  .mobile-menu-toggle {
    display: block;
    margin-left: auto;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--surface-glass);
    backdrop-filter: blur(18px);
    border: 1px solid var(--accent-glow);
    border-radius: 20px;
    margin: 0.5rem 1rem;
    padding: 1rem;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity 0.3s ease, transform 0.3s ease;
  }

  .site-nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .site-nav__list {
    flex-direction: column;
    gap: 0;
  }

  .site-nav__item {
    width: 100%;
  }

  .site-nav__link,
  .site-nav .button {
    display: block;
    width: 100%;
    text-align: center;
    padding: 1rem;
    min-height: 44px;
  }
}

/* Content Sections */
.content-section {
  padding: clamp(2.5rem, 6vw, 4rem) clamp(1.5rem, 6vw, 4rem);
  margin: clamp(3rem, 7vw, 5rem) 0 0;
  margin-top: 0em;
}

.section-offset-top {
  margin-top: 2rem;
}

.content-inner {
  margin: 0 auto;
  max-width: 960px;
  width: 100%;
}

.section-heading {
  /* margin: 0 0 2rem; */
  font-size: clamp(1.5rem, 3vw, 1.5rem);
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: var(--text-light);
}

.section-intro {
  font-size: clamp(1.1rem, 1.8vw, 1.3rem);
  margin-bottom: 1.5rem;
}

.content-section p {
  margin: 0 0 0rem;
  font-size: clamp(1rem, 1.4vw, 1.1rem);
  line-height: 1.7;
  color: var(--text-muted);
}

.content-section p:last-child {
  margin-bottom: 0;
}

.two-column-content .column p + p {
  margin-top: 1.25rem;
}

.content-section strong {
  color: var(--accent);
  font-weight: 600;
}

.content-section.highlight-box .content-inner {
  padding: clamp(2rem, 4vw, 3rem);
  border: 1px solid var(--accent-glow);
  border-radius: 20px;
  background: var(--content-inner-gradient);
  backdrop-filter: blur(12px);
  box-shadow: 0 28px 80px var(--shadow-deep);
}

.content-section em {
  color: var(--text-light);
  font-style: italic;
}

.split-section .content-inner {
  max-width: 1200px;
}

.split-section__inner {
  display: flex;
  align-items: stretch;
  gap: clamp(2rem, 6vw, 4.5rem);
}

.split-section__visual,
.split-section__content {
  flex: 1 1 0;
}

.split-section__visual {
  position: relative;
  min-height: clamp(260px, 42vw, 420px);
  border-radius: 26px;
  overflow: hidden;
  /* padding: clamp(2.5rem, 4vw, 3.5rem); */
  display: grid;
  place-items: center;
 /* background: linear-gradient(135deg, rgba(70, 52, 30, 0.8), rgba(18, 18, 26, 0.85)); */
  border: 1px solid var(--accent-glow);
  box-shadow: 0 28px 80px var(--shadow-deep);
}

.cta-section {
  padding: clamp(1rem, 1.2vw, 2rem);
}
.split-section__visual::after {
  content: '';
  position: absolute;
  inset: 1.5rem;
  border-radius: 22px;
 /* border: 1px solid rgba(234, 160, 28, 0.22); */
  pointer-events: none;
  mix-blend-mode: screen;
}

.split-section__visual img {
  max-width: min(320px, 68%);
  width: 100%;
  height: auto;
  filter: drop-shadow(0 22px 35px rgba(0, 0, 0, 0.45));
}

.split-section__content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: clamp(1rem, 2vw, 1.75rem);
}

.split-section__content .section-heading {
  margin-bottom: 0.75rem;
}

.split-section--visual-right .split-section__visual {
  order: 2;
}

.split-section--visual-right .split-section__content {
  order: 1;
}

.split-section__visual.is-decorative {
  position: relative;
  isolation: isolate;
}

.split-section--glyph .split-section__visual {
 /* background: radial-gradient(circle at 30% 25%, rgba(234, 160, 28, 0.35), transparent 55%),
    radial-gradient(circle at 70% 75%, rgba(125, 78, 24, 0.38), transparent 60%),
    linear-gradient(155deg, rgba(44, 32, 25, 0.85), rgba(16, 16, 26, 0.92)); */
}

.split-section--glyph .split-section__visual::before {
  content: '';
  position: absolute;
  inset: 0;
/*  background: radial-gradient(circle at 50% 50%, rgba(234, 160, 28, 0.18), transparent 70%); */
  z-index: -1;
}

.split-section--constellation .split-section__visual {
/*  background: radial-gradient(circle at 20% 40%, rgba(234, 160, 28, 0.3), transparent 60%),
    linear-gradient(160deg, rgba(36, 28, 50, 0.92), rgba(18, 18, 26, 0.9)); */
}



.split-section--grid .split-section__visual {
  background: linear-gradient(160deg, rgba(32, 24, 40, 0.94), rgba(18, 18, 26, 0.9));
}

  .split-section--critical .split-section__visual {
  /* background: radial-gradient(circle at 20% 30%, rgba(200, 70, 20, 0.32), transparent 62%),
    linear-gradient(145deg, rgba(54, 26, 26, 0.9), rgba(10, 10, 20, 0.92));  */
}

@media (max-width: 1024px) {
  .split-section__inner {
    gap: clamp(1.5rem, 5vw, 3rem);
  }
}

@media (max-width: 900px) {
  .split-section__inner {
    flex-direction: column;
  }

  .split-section__visual,
  .split-section__content {
    order: unset;
    width: 100%;
  }

  .split-section__visual {
    min-height: clamp(220px, 55vw, 320px);
  }

  .three-viewer {
    width: min(100%, clamp(220px, 55vw, 320px));
  }

  .hero-three-viewer {
    width: min(100%, clamp(240px, 70vw, 420px));
  }

  #about .split-section__content {
    order: 1;
  }

  #about .split-section__visual {
    order: 2;
  }
}

.tagline {
  font-size: clamp(1.1rem, 1.8vw, 1.3rem);
  color: var(--text-light);
  font-weight: 500;
}

.two-column-content {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.2rem);
  /*grid-template-columns: 1fr;*/
  margin-top: 2.5rem;
}

.two-column-content .column {
  padding: 2rem;
  border: 1px solid var(--accent-glow);
  border-radius: 16px;
  background: var(--surface-dark-subtle);
  backdrop-filter: blur(8px);
}

.subsection-heading {
  margin: 0 0 1.25rem;
  font-size: clamp(1.2rem, 2vw, 1.5rem);
  line-height: 1.3;
  letter-spacing: 0.02em;
  color: var(--accent);
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 2rem 2rem;
}

.feature-list li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 1rem;
  font-size: clamp(0.95rem, 1.3vw, 1.05rem);
  line-height: 1.6;
  color: var(--text-muted);
}

.feature-list li:last-child {
  margin-bottom: 0;
}

.feature-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 6px;
  height: 6px;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(234, 160, 28, 0.6), 0 2px 4px rgba(234, 160, 28, 0.3);
}

/* Footer */
.site-footer {
  padding: clamp(3rem, 6vw, 5rem) clamp(1.5rem, 6vw, 4rem);
  background: linear-gradient(180deg, transparent 0%, rgba(18, 18, 26, 0.6) 100%);
  border-top: 1px solid var(--accent-glow);
}

.footer-inner {
  margin: 0 auto;
  max-width: 1200px;
  width: 100%;
  text-align: center;
}

.footer-cta {
  margin-bottom: 2.5rem;
}

.footer-cta h3 {
  margin: 0 0 1.5rem;
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.3;
  color: var(--text-light);
}

.footer-meta {
  padding-top: 2rem;
  border-top: 1px solid rgba(234, 160, 28, 0.15);
}

.footer-meta p {
  margin: 0;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
}

@media (max-width: 768px) {
  .content-section {
    padding: clamp(2.5rem, 6vw, 4rem) clamp(1rem, 5vw, 2rem);
  }

  .highlight-box--formal-methods {
   /* border-top: 1px solid var(--accent-glow);
    border-bottom: 1px solid var(--accent-glow); */
  }

  .highlight-box--formal-methods .content-inner {
    padding: clamp(1.25rem, 5vw, 1.75rem) 0;
    border: 0;
    border-radius: 0;
    background: none;
    backdrop-filter: none;
    box-shadow: none;
  }

  .highlight-box--formal-methods .two-column-content {
    margin-top: 2rem;
  }

  .highlight-box--formal-methods .two-column-content .column {
    padding: 0;
    border: 0;
    border-radius: 0;
    background: none;
    backdrop-filter: none;
    box-shadow: none;
  }

  .two-column-content {
   /* grid-template-columns: 1fr; */
    gap: 2.5rem;
  }

  .feature-list {
    margin: 1.5rem 0rem 1.5rem 0rem;
  }
}

@media (min-width: 900px) {
  .two-column-content {
    /*grid-template-columns: repeat(2, minmax(0, 1fr));*/
  }
}