:root {
  --bg: #0a0a0f;
  --bg-elevated: #12121a;
  --fg: #e8e8ed;
  --fg-muted: #8888a0;
  --accent: #00e5c3;
  --accent-dim: rgba(0, 229, 195, 0.12);
  --accent-glow: rgba(0, 229, 195, 0.25);
  --warm: #ff6b4a;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'DM Sans', sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  overflow-x: hidden;
}

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 80px 6vw 60px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -20%;
  width: 70vw;
  height: 70vw;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 65%);
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 60px;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-tag {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 28px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 5.5vw, 4.2rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -1.5px;
  margin-bottom: 28px;
}

.hero h1 .accent {
  color: var(--accent);
}

.hero-sub {
  font-size: 18px;
  color: var(--fg-muted);
  max-width: 500px;
  line-height: 1.7;
}

/* Brain visual */
.hero-right {
  display: flex;
  justify-content: center;
  align-items: center;
}

.brain-visual {
  position: relative;
  width: 280px;
  height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brain-icon {
  font-size: 100px;
  z-index: 2;
  filter: drop-shadow(0 0 40px var(--accent-glow));
}

.pulse-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--accent);
  opacity: 0;
  animation: pulse-out 3s ease-out infinite;
}

.ring-1 { width: 140px; height: 140px; animation-delay: 0s; }
.ring-2 { width: 200px; height: 200px; animation-delay: 1s; }
.ring-3 { width: 260px; height: 260px; animation-delay: 2s; }

@keyframes pulse-out {
  0% { opacity: 0.6; transform: scale(0.8); }
  100% { opacity: 0; transform: scale(1.4); }
}

/* ===== WHAT ===== */
.what {
  padding: 120px 6vw;
  background: var(--bg-elevated);
}

.what-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.section-label {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 40px;
}

.what-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.what-big h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.5px;
}

.what-detail p {
  color: var(--fg-muted);
  margin-bottom: 16px;
  font-size: 16px;
}

.what-detail strong {
  color: var(--fg);
}

/* ===== WHY ===== */
.why {
  padding: 120px 6vw;
}

.why-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.why-card {
  background: var(--bg-elevated);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 16px;
  padding: 36px;
  transition: border-color 0.3s;
}

.why-card:hover {
  border-color: var(--accent-glow);
}

.why-number {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 16px;
}

.why-card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.3px;
}

.why-card p {
  color: var(--fg-muted);
  font-size: 15px;
  line-height: 1.6;
}

/* ===== TOPICS MARQUEE ===== */
.topics {
  padding: 100px 6vw;
  background: var(--bg-elevated);
  overflow: hidden;
}

.topics-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.topics-marquee {
  overflow: hidden;
  margin-bottom: 16px;
  mask-image: linear-gradient(90deg, transparent, black 10%, black 90%, transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, black 10%, black 90%, transparent);
}

.marquee-track {
  display: flex;
  gap: 12px;
  width: max-content;
  animation: scroll-left 30s linear infinite;
}

.topics-marquee.reverse .marquee-track {
  animation: scroll-right 35s linear infinite;
}

.topic-pill {
  display: inline-block;
  padding: 10px 22px;
  border-radius: 100px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--fg-muted);
}

.topic-pill.highlight {
  background: var(--accent-dim);
  border-color: rgba(0, 229, 195, 0.2);
  color: var(--accent);
}

@keyframes scroll-left {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

@keyframes scroll-right {
  0% { transform: translateX(-50%); }
  100% { transform: translateX(0); }
}

/* ===== CLOSING ===== */
.closing {
  padding: 140px 6vw;
  text-align: center;
}

.closing-inner {
  max-width: 700px;
  margin: 0 auto;
}

.closing h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 20px;
}

.closing-sub {
  font-size: 18px;
  color: var(--fg-muted);
}

/* ===== FOOTER ===== */
.site-footer {
  padding: 40px 6vw;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--fg);
}

.footer-meta {
  font-size: 14px;
  color: var(--fg-muted);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .hero {
    padding: 100px 24px 60px;
    min-height: auto;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-right {
    order: -1;
  }

  .brain-visual {
    width: 180px;
    height: 180px;
  }

  .brain-icon {
    font-size: 64px;
  }

  .ring-1 { width: 90px; height: 90px; }
  .ring-2 { width: 130px; height: 130px; }
  .ring-3 { width: 170px; height: 170px; }

  .what { padding: 80px 24px; }

  .what-columns {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .why { padding: 80px 24px; }

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

  .topics { padding: 60px 24px; }

  .closing { padding: 80px 24px; }

  .footer-inner {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
}