:root {
  --bg-primary: #090b12;
  --bg-secondary: #111624;
  --bg-tertiary: #171d2f;
  --bg-card: rgba(17, 22, 36, 0.82);
  --surface-strong: rgba(255, 255, 255, 0.06);
  --surface-soft: rgba(255, 255, 255, 0.03);
  --text-primary: #f4f7fb;
  --text-secondary: #b9c3d5;
  --text-muted: #8f9ab0;
  --border: rgba(181, 198, 226, 0.16);
  --border-strong: rgba(181, 198, 226, 0.28);
  --accent: #7cc7ff;
  --accent-warm: #d7b06d;
  --accent-soft: rgba(124, 199, 255, 0.18);
  --shadow: 0 22px 48px rgba(0, 0, 0, 0.28);
  --shadow-soft: 0 12px 28px rgba(0, 0, 0, 0.18);
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --nav-height: 88px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 16px);
}

section[id] {
  scroll-margin-top: 96px;
}

body {
  margin: 0;
  font-family: "Inter", sans-serif;
  line-height: 1.65;
  color: var(--text-primary);
  background:
    radial-gradient(circle at top left, rgba(124, 199, 255, 0.08), transparent 30%),
    radial-gradient(circle at 85% 15%, rgba(215, 176, 109, 0.08), transparent 24%),
    linear-gradient(180deg, #07090f 0%, #0a0d16 36%, #090b12 100%);
  overflow-x: hidden;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.page-shell {
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.7), transparent 85%);
}

.container {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
}

.section {
  position: relative;
  padding: 6rem 0;
}

#about {
  padding-top: 5.25rem;
}

#consulting {
  padding-bottom: 2.5rem;
}

#mathematics {
  padding-top: 4rem;
}

#academy {
  padding-top: 2.75rem;
}

.section-accent::before {
  content: "";
  position: absolute;
  inset: 2rem 0;
  background: linear-gradient(180deg, rgba(124, 199, 255, 0.05), rgba(124, 199, 255, 0.015));
  border-top: 1px solid rgba(124, 199, 255, 0.12);
  border-bottom: 1px solid rgba(124, 199, 255, 0.09);
  pointer-events: none;
}

.section-header {
  max-width: 860px;
  margin: 0 auto 3.25rem;
  text-align: center;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  min-height: 2.25rem;
  padding: 0.35rem 0.9rem;
  margin-bottom: 1rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.section-title,
.hero-title,
.newsletter-title,
.card-title,
.logo {
  font-family: "Space Grotesk", sans-serif;
}

.section-title {
  margin: 0 0 1rem;
  font-size: clamp(2.1rem, 4vw, 3.3rem);
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.08;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.section-description,
.newsletter-description {
  color: var(--text-secondary);
  font-size: 1.08rem;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
  text-wrap: pretty;
}

.hero-subtitle,
.about-intro,
.work-intro {
  max-width: 760px;
  text-wrap: pretty;
}

.hero-subtitle {
  color: var(--text-secondary);
  margin: 1.4rem 0 0;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
}

@supports not (text-wrap: pretty) {
  .section-description,
  .hero-subtitle,
  .about-intro,
  .work-intro,
  .newsletter-description {
    text-wrap: normal;
  }
}

.site-header {
  position: relative;
  min-height: 100vh;
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  border-bottom: 1px solid transparent;
  background: rgba(7, 9, 15, 0.7);
  backdrop-filter: blur(18px);
  transition: background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.navbar.scrolled {
  background: rgba(7, 9, 15, 0.92);
  border-color: var(--border);
  box-shadow: var(--shadow-soft);
}

.nav-container {
  min-height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  color: var(--text-primary);
  text-decoration: none;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  position: relative;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.97rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.45rem;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: left;
  background: linear-gradient(90deg, var(--accent), var(--accent-warm));
  transition: transform 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
}

.mobile-menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.85rem;
  height: 2.85rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-primary);
  font-size: 1.1rem;
  cursor: pointer;
}

.hero {
  display: flex;
  align-items: center;
  min-height: 100vh;
  padding-top: calc(var(--nav-height) + 3rem);
}

.hero-background {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero-gif {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.24;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(7, 9, 15, 0.45), rgba(7, 9, 15, 0.86)),
    radial-gradient(circle at center, rgba(124, 199, 255, 0.08), transparent 48%);
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  align-items: center;
  gap: 2.5rem;
}

.hero-copy {
  max-width: 760px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: rgba(8, 13, 22, 0.78);
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1.35rem;
}

.hero-title {
  margin: 0;
  max-width: 760px;
  font-size: clamp(2.85rem, 6vw, 5.15rem);
  line-height: 1.04;
  letter-spacing: -0.05em;
  text-wrap: balance;
}

.math-panel {
  padding: 1.7rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.02)),
    rgba(8, 12, 20, 0.88);
  box-shadow: var(--shadow);
}

.math-panel-label {
  margin: 0 0 0.85rem;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.math-formula {
  min-height: 8rem;
  padding: 1rem 1rem 0.4rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: linear-gradient(180deg, rgba(124, 199, 255, 0.06), rgba(255, 255, 255, 0.01));
  overflow-x: auto;
}

.math-panel-text {
  margin: 1rem 0 0;
  color: var(--text-secondary);
}

.cta-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.2rem;
  padding: 0.85rem 1.4rem;
  border: 1px solid transparent;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(135deg, #8ccffd 0%, #a9ddff 40%, #d7b06d 100%);
  color: #09101a;
  box-shadow: 0 10px 24px rgba(124, 199, 255, 0.18);
}

.btn-secondary {
  border-color: var(--border-strong);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-primary);
}

.about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 2rem;
  align-items: start;
}

.about-copy p {
  margin: 0 0 1.25rem;
  color: var(--text-secondary);
  font-size: 1.06rem;
}

.about-signals {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.work-panel,
.signal-card,
.academy-panel,
.card {
  border: 1px solid var(--border);
  background: var(--bg-card);
  box-shadow: var(--shadow-soft);
}

.work-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.9fr);
  gap: 1.4rem;
  padding: 1.7rem;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(124, 199, 255, 0.05), rgba(215, 176, 109, 0.04)),
    var(--bg-card);
}

.work-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.work-status {
  display: inline-flex;
  align-items: center;
  min-height: 2rem;
  padding: 0.3rem 0.8rem;
  margin-bottom: 1rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.work-title {
  margin: 0 0 0.9rem;
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(1.8rem, 3vw, 2.45rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.work-description,
.work-note {
  margin: 0 0 1rem;
  color: var(--text-secondary);
  font-size: 1rem;
}

.work-note {
  max-width: 42rem;
}

.work-capabilities {
  display: grid;
  gap: 1rem;
}

.work-tile {
  min-height: 100%;
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.03);
}

.work-tile h3 {
  margin: 0 0 0.55rem;
  font-size: 1.02rem;
}

.work-tile p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.96rem;
}

.signal-card {
  min-height: 100%;
  padding: 1.3rem;
  border-radius: var(--radius-md);
}

.signal-card h3 {
  margin: 0 0 0.55rem;
  font-size: 1.02rem;
}

.signal-card p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.96rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1.2rem;
}

.card {
  grid-column: span 4;
  position: relative;
  padding: 1.6rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, rgba(124, 199, 255, 0.5), transparent);
}

.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  margin-bottom: 1rem;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(124, 199, 255, 0.18), rgba(215, 176, 109, 0.18));
  color: var(--accent);
  font-size: 1.15rem;
}

.card-title {
  margin: 0 0 0.75rem;
  font-size: 1.23rem;
  line-height: 1.2;
}

.card-description {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.98rem;
}

.section-cta {
  display: flex;
  justify-content: center;
  margin-top: 2.25rem;
}

.academy-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 2rem;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(124, 199, 255, 0.05), rgba(215, 176, 109, 0.05)),
    var(--bg-card);
}

.academy-panel .section-title {
  margin-bottom: 0.85rem;
}

.academy-text {
  max-width: 700px;
  margin: 0;
}

.newsletter-section {
  padding: 5.5rem 0 6rem;
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent);
}

.newsletter-container {
  text-align: center;
}

.newsletter-title {
  margin: 0 0 0.8rem;
  font-size: 2.2rem;
}

.newsletter-description {
  margin: 0 auto 2rem;
  max-width: 580px;
}

.newsletter-embed {
  display: flex;
  justify-content: center;
}

.newsletter-embed iframe {
  width: min(100%, 482px);
  max-width: 100%;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
}

.footer {
  padding: 2.5rem 0 3rem;
  border-top: 1px solid var(--border);
}

.footer-content {
  text-align: center;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 0.9rem;
  margin-bottom: 1.4rem;
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-secondary);
  text-decoration: none;
  transition: transform 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.social-link:hover {
  transform: translateY(-1px);
  border-color: var(--border-strong);
  color: var(--text-primary);
}

.copyright {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.animate-delay-1 {
  transition-delay: 0.08s;
}

.animate-delay-2 {
  transition-delay: 0.16s;
}

.animate-delay-3 {
  transition-delay: 0.24s;
}

.animate-delay-4 {
  transition-delay: 0.32s;
}

@media (max-width: 1080px) {
  .hero-layout,
  .about-layout,
  .work-panel,
  .academy-panel {
    grid-template-columns: 1fr;
  }

  .academy-panel {
    align-items: flex-start;
  }

  .card {
    grid-column: span 6;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 76px;
  }

  .section {
    padding: 4.5rem 0;
  }

  #about {
    padding-top: 4rem;
  }

  #consulting {
    padding-bottom: 2rem;
  }

  #mathematics {
    padding-top: 3rem;
  }

  #academy {
    padding-top: 2rem;
  }

  .container {
    width: min(100% - 1.25rem, 1180px);
  }

  .mobile-menu-toggle {
    display: inline-flex;
  }

  .nav-menu {
    position: absolute;
    top: calc(100% + 0.35rem);
    left: 0.625rem;
    right: 0.625rem;
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: rgba(9, 12, 21, 0.97);
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-0.5rem);
    transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s ease;
  }

  .nav-menu.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .hero {
    min-height: auto;
    padding-top: calc(var(--nav-height) + 2rem);
  }

  .hero-layout {
    gap: 1.5rem;
  }

  .hero-title {
    font-size: clamp(2.6rem, 16vw, 4rem);
  }

  .about-signals {
    grid-template-columns: 1fr;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .card {
    grid-column: auto;
  }

  .cta-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    width: 100%;
  }

  .math-panel {
    padding: 1.25rem;
  }
}

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

  *,
  *::before,
  *::after {
    animation: none !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
    scroll-behavior: auto !important;
  }

  .animate-on-scroll {
    opacity: 1;
    transform: none;
  }
}