:root {
  --background: #040405;
  --foreground: #f4f4f6;
  --muted: #777c8e;
  --accent: #ff6b1a;
  --accent-strong: #ff8946;
  --card-bg: rgba(12, 13, 17, 0.85);
  --card-border: rgba(255, 107, 26, 0.4);
  --font-sans: "Space Grotesk", system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", ui-monospace, SFMono-Regular,
    Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --max-width: 1160px;
  color-scheme: dark;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: radial-gradient(circle at top right, #0e0912 0%, #040405 60%);
  color: var(--foreground);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: conic-gradient(
      from 45deg at 10% 10%,
      rgba(255, 107, 26, 0.1),
      rgba(255, 107, 26, 0) 40%
    ),
    linear-gradient(
      120deg,
      rgba(255, 137, 70, 0.12) 0%,
      rgba(255, 137, 70, 0) 40%,
      rgba(255, 137, 70, 0.08) 70%,
      rgba(255, 137, 70, 0) 100%
    );
  z-index: -3;
}

.noise-overlay {
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='80' height='80' viewBox='0 0 100 100'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect x='0' y='0' width='100' height='100' filter='url(%23n)' opacity='0.14'/%3E%3C/svg%3E");
  opacity: 0.35;
  pointer-events: none;
  z-index: -1;
}

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

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

.page-header {
  position: relative;
  padding: 24px 32px 0;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 8px 0;
  position: sticky;
  top: 12px;
  z-index: 10;
  transition: transform 0.35s ease, background 0.3s ease, border 0.3s ease;
  backdrop-filter: blur(20px);
  background: rgba(3, 3, 6, 0.6);
  border: 1px solid rgba(255, 107, 26, 0.2);
  border-radius: 999px;
  padding: 10px 28px;
}

.nav.nav-hidden {
  transform: translateY(-120%);
}

.nav.nav-visible {
  transform: translateY(0);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.9rem;
}

.brand img {
  width: 40px;
  height: 40px;
  filter: drop-shadow(0 0 10px rgba(255, 107, 26, 0.5));
}

.nav-links {
  display: flex;
  gap: 20px;
  font-size: 0.95rem;
}

.nav-links a {
  position: relative;
  color: var(--muted);
  transition: color 0.2s ease;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 100%;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s ease;
}

.nav-links a:hover {
  color: var(--foreground);
}

.nav-links a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-actions {
  display: flex;
  gap: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 10px 20px;
  border: 1px solid transparent;
  transition: transform 0.18s ease, box-shadow 0.25s ease, border 0.2s ease;
  cursor: pointer;
}

.button.primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-strong));
  color: #1b0e05;
  box-shadow: 0 10px 25px rgba(255, 107, 26, 0.35);
}

.button.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 35px rgba(255, 107, 26, 0.45);
}

.button.secondary {
  border-color: rgba(255, 107, 26, 0.4);
  color: var(--foreground);
}

.button.secondary:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.button.ghost {
  border-color: rgba(255, 107, 26, 0.3);
  color: var(--foreground);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 420px);
  gap: 64px;
  max-width: var(--max-width);
  margin: 80px auto 0;
  padding-bottom: 120px;
  position: relative;
}

.hero::before {
  content: "";
  position: absolute;
  right: -220px;
  top: -80px;
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, rgba(255, 137, 70, 0.45), rgba(4, 4, 5, 0));
  filter: blur(40px);
  z-index: -2;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.75rem;
  color: rgba(255, 107, 26, 0.7);
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--font-sans);
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.75rem, 5vw, 3.8rem);
  line-height: 1.1;
}

.accent {
  color: var(--accent);
  text-shadow: 0 0 18px rgba(255, 107, 26, 0.45);
}

.lead {
  margin: 0;
  font-size: 1.1rem;
  line-height: 1.6;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin: 0;
}

.hero-metrics dt {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 137, 70, 0.8);
}

.hero-metrics dd {
  margin: 6px 0 0;
  font-size: 0.95rem;
  color: var(--foreground);
  font-family: var(--font-mono);
}

.hero-grid {
  display: grid;
  gap: 18px;
  align-content: start;
}

.grid-card {
  padding: 24px;
  background: var(--card-bg);
  border: 1px solid rgba(255, 137, 70, 0.2);
  border-radius: 16px;
  box-shadow: inset 0 0 0 1px rgba(255, 137, 70, 0.05),
    0 16px 40px rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(16px);
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.hero-grid .grid-card,
.thesis-card,
.arch-column,
.stack-card,
.roadmap-step,
.resource-chip {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  transition-delay: var(--reveal-delay, 0ms);
}

.hero-grid .grid-card.is-visible,
.thesis-card.is-visible,
.arch-column.is-visible,
.stack-card.is-visible,
.roadmap-step.is-visible,
.resource-chip.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.grid-card:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 137, 70, 0.5);
}

.grid-title {
  display: inline-flex;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255, 137, 70, 0.76);
  margin-bottom: 12px;
}

.section {
  padding: 120px 32px;
}

.section:nth-of-type(even) {
  background: rgba(6, 6, 8, 0.75);
}

.section-heading {
  max-width: var(--max-width);
  margin: 0 auto 48px;
}

.section-heading h2 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1.2;
}

.thesis-body {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.thesis-card {
  padding: 32px;
  border-radius: 18px;
  background: radial-gradient(
      circle at top left,
      rgba(255, 107, 26, 0.18),
      rgba(5, 5, 7, 0.95)
    ),
    rgba(10, 10, 14, 0.9);
  border: 1px solid rgba(255, 137, 70, 0.3);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.35);
}

.thesis-card p {
  color: var(--muted);
  line-height: 1.6;
}

.architecture .arch-diagram {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.arch-column {
  padding: 30px;
  background: rgba(14, 14, 20, 0.85);
  border: 1px solid rgba(255, 137, 70, 0.25);
  border-radius: 18px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.32);
}

.arch-column ul {
  margin: 18px 0 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.6;
}

.arch-column code {
  font-family: var(--font-mono);
  color: var(--accent-strong);
}

.arch-footer {
  max-width: 880px;
  margin: 36px auto 0;
  text-align: center;
  color: rgba(201, 201, 210, 0.75);
}

.stack-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.stack-card {
  padding: 28px;
  border-radius: 16px;
  border: 1px solid rgba(255, 137, 70, 0.25);
  background: linear-gradient(145deg, rgba(12, 12, 18, 0.9), rgba(6, 6, 9, 0.8));
  display: flex;
  flex-direction: column;
  gap: 18px;
  box-shadow: 0 18px 36px rgba(0, 0, 0, 0.35);
}

.stack-card a {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: rgba(255, 137, 70, 0.8);
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

.card-label {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(255, 137, 70, 0.64);
}

.roadmap-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

.roadmap-step {
  padding: 32px;
  border-radius: 18px;
  border: 1px solid rgba(255, 137, 70, 0.3);
  background: rgba(10, 10, 14, 0.85);
  position: relative;
  overflow: hidden;
}

.roadmap-step::before {
  content: "";
  position: absolute;
  inset: auto -40% -40% 0;
  height: 120%;
  transform: rotate(25deg);
  background: radial-gradient(
    circle,
    rgba(255, 107, 26, 0.18),
    rgba(10, 10, 14, 0)
  );
}

.roadmap-step h3 {
  margin-bottom: 12px;
}

.step-index {
  font-size: 1.6rem;
  font-family: var(--font-mono);
  color: rgba(255, 137, 70, 0.6);
}

.resources .resource-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.resource-chip {
  padding: 14px 18px;
  border-radius: 999px;
  border: 1px solid rgba(255, 137, 70, 0.4);
  background: rgba(12, 12, 16, 0.8);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 137, 70, 0.76);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.resource-chip:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}

.page-footer {
  padding: 48px 32px 80px;
  background: #020204;
  border-top: 1px solid rgba(255, 137, 70, 0.18);
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: rgba(204, 204, 216, 0.75);
  font-size: 0.95rem;
}

.footer-content span {
  margin-left: 6px;
}

.footer-content a {
  color: rgba(255, 137, 70, 0.75);
  font-family: var(--font-mono);
}

@media (max-width: 1080px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  }

  .stack-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 860px) {
  .nav {
    flex-wrap: wrap;
    gap: 18px;
  }

  .nav-links {
    width: 100%;
    justify-content: center;
  }

  .nav-actions {
    width: 100%;
    justify-content: flex-end;
  }

  .thesis-body,
  .architecture .arch-diagram,
  .roadmap-grid {
    grid-template-columns: repeat(1, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .page-header {
    padding: 24px 20px 0;
  }

  .section {
    padding: 90px 20px;
  }

  .hero-metrics {
    grid-template-columns: repeat(1, minmax(0, 1fr));
  }

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

  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}