:root {
  --bg: #050608;
  --bg-alt: #0b0d11;
  --fg: #f5f5f7;
  --muted: #a0a4b0;
  --accent: #ffd166;
  --accent-soft: rgba(255, 209, 102, 0.12);
  --border-subtle: #1b1e26;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Helvetica Neue", Arial, sans-serif;
}

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

html,
body {
  margin: 0;
  padding: 0;
  background: radial-gradient(circle at top, #11131a 0, #050608 55%);
  color: var(--fg);
  font-family: var(--font-sans);
  scroll-behavior: smooth;
}

body {
  line-height: 1.6;
}

/* Layout */

.section {
  padding: 80px 20px;
  border-bottom: 1px solid var(--border-subtle);
}

.section.alt {
  background: linear-gradient(to bottom, #050608, #070910);
}

.section.closing {
  text-align: center;
  padding-bottom: 120px;
}

.section-content {
  max-width: 960px;
  margin: 0 auto;
}

.two-column {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1.5fr);
  gap: 40px;
}

@media (max-width: 800px) {
  .two-column {
    grid-template-columns: 1fr;
  }
}

/* Hero */

.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1.5fr);
  gap: 40px;
  align-items: center;
  padding: 80px 20px 40px;
}

.hero-content {
  max-width: 560px;
  margin: 0 auto;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-visual img {
  max-width: 320px;
  width: 100%;
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.6));
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: left;
  }

  .hero-visual {
    order: -1;
  }
}

/* Typography */

h1,
h2,
h3 {
  margin: 0 0 16px;
  letter-spacing: 0.02em;
}

h1 {
  font-size: clamp(2.6rem, 4vw, 3.4rem);
}

h2 {
  font-size: clamp(1.8rem, 3vw, 2.2rem);
}

h3 {
  font-size: 1.1rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

p {
  margin: 0 0 12px;
  color: var(--fg);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.75rem;
  color: var(--muted);
  margin-bottom: 12px;
}

.subtitle {
  font-size: 1.1rem;
  color: var(--muted);
  margin-bottom: 8px;
}

.author {
  font-size: 0.95rem;
  color: var(--muted);
  margin-bottom: 24px;
}

.section-tagline {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--muted);
  margin-bottom: 24px;
}

.hero-quote {
  font-style: italic;
  border-left: 2px solid var(--accent);
  padding-left: 16px;
  margin: 24px 0 32px;
  color: var(--muted);
}

.key-points {
  list-style: none;
  padding: 0;
  margin: 16px 0 16px;
}

.key-points li {
  margin-bottom: 8px;
  padding-left: 18px;
  position: relative;
  color: var(--fg);
}

.key-points li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--accent);
}

.example {
  margin-top: 12px;
  color: var(--muted);
}

.visual-caption {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 8px;
}

.closing-note {
  margin-top: 16px;
  color: var(--muted);
}

/* Cards & Callouts */

.visual-card,
.callout {
  border-radius: 16px;
  border: 1px solid var(--border-subtle);
  background: radial-gradient(circle at top left, var(--accent-soft), #050608);
  padding: 20px;
}

.callout h3 {
  margin-top: 0;
}

/* Buttons */

.primary-cta,
.secondary-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease,
    border-color 0.15s ease;
}

.primary-cta {
  background: var(--accent);
  color: #111;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.primary-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.6);
}

.secondary-cta {
  margin-top: 24px;
  background: transparent;
  color: var(--accent);
  border-color: var(--accent-soft);
}

.secondary-cta:hover {
  background: var(--accent-soft);
}

/* Scroll Animations */

.fade-in-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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