:root {
  --bg: #0a0a0c;
  --bg-elevated: #131318;
  --bg-card: #1a1a22;
  --fg: #e8e6e1;
  --fg-muted: #8a877f;
  --accent: #f59e0b;
  --accent-glow: rgba(245, 158, 11, 0.15);
  --accent-dim: #b47308;
  --font-display: 'Syne', 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-weight: 300;
  line-height: 1.6;
  overflow-x: hidden;
}

/* ===== HERO ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 6rem 2rem 4rem;
  position: relative;
  overflow: hidden;
  background: radial-gradient(ellipse at 20% 50%, rgba(245, 158, 11, 0.06) 0%, transparent 60%);
}

.hero-inner {
  max-width: 900px;
  margin: 0 auto;
  width: 100%;
}

.hero-badge {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  padding: 0.4rem 1rem;
  border-radius: 2rem;
  margin-bottom: 2.5rem;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--fg);
  margin-bottom: 1.5rem;
}

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

.hero-sub {
  font-size: 1.15rem;
  color: var(--fg-muted);
  max-width: 480px;
  line-height: 1.7;
  margin-bottom: 3rem;
}

/* Sound wave animation */
.sound-wave {
  display: flex;
  align-items: center;
  gap: 4px;
  height: 40px;
}

.sound-wave .bar {
  width: 3px;
  background: var(--accent);
  border-radius: 3px;
  animation: wave 1.2s ease-in-out infinite;
}

.sound-wave .bar:nth-child(1) { height: 8px; animation-delay: 0s; }
.sound-wave .bar:nth-child(2) { height: 16px; animation-delay: 0.1s; }
.sound-wave .bar:nth-child(3) { height: 24px; animation-delay: 0.15s; }
.sound-wave .bar:nth-child(4) { height: 32px; animation-delay: 0.2s; }
.sound-wave .bar:nth-child(5) { height: 20px; animation-delay: 0.25s; }
.sound-wave .bar:nth-child(6) { height: 36px; animation-delay: 0.3s; }
.sound-wave .bar:nth-child(7) { height: 14px; animation-delay: 0.35s; }
.sound-wave .bar:nth-child(8) { height: 28px; animation-delay: 0.4s; }
.sound-wave .bar:nth-child(9) { height: 10px; animation-delay: 0.45s; }
.sound-wave .bar:nth-child(10) { height: 22px; animation-delay: 0.5s; }
.sound-wave .bar:nth-child(11) { height: 34px; animation-delay: 0.55s; }
.sound-wave .bar:nth-child(12) { height: 18px; animation-delay: 0.6s; }
.sound-wave .bar:nth-child(13) { height: 26px; animation-delay: 0.65s; }
.sound-wave .bar:nth-child(14) { height: 12px; animation-delay: 0.7s; }
.sound-wave .bar:nth-child(15) { height: 30px; animation-delay: 0.75s; }
.sound-wave .bar:nth-child(16) { height: 16px; animation-delay: 0.8s; }
.sound-wave .bar:nth-child(17) { height: 24px; animation-delay: 0.85s; }
.sound-wave .bar:nth-child(18) { height: 8px; animation-delay: 0.9s; }
.sound-wave .bar:nth-child(19) { height: 20px; animation-delay: 0.95s; }
.sound-wave .bar:nth-child(20) { height: 14px; animation-delay: 1s; }

@keyframes wave {
  0%, 100% { transform: scaleY(0.4); opacity: 0.5; }
  50% { transform: scaleY(1); opacity: 1; }
}

/* ===== CONCEPT ===== */
.concept {
  padding: 8rem 2rem;
  background: var(--bg);
}

.concept-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.concept-left h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  position: sticky;
  top: 4rem;
}

.concept-right {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.concept-card {
  background: var(--bg-elevated);
  border: 1px solid rgba(255,255,255,0.04);
  border-radius: 12px;
  padding: 1.5rem 1.8rem;
  transition: all 0.3s ease;
}

.concept-card.active {
  background: var(--accent-glow);
  border-color: var(--accent-dim);
}

.concept-label {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-bottom: 0.5rem;
}

.concept-card.active .concept-label {
  color: var(--accent);
}

.concept-card p {
  font-size: 0.95rem;
  color: var(--fg-muted);
  line-height: 1.6;
}

.concept-card.active p {
  color: var(--fg);
}

/* ===== FEATURES ===== */
.features {
  padding: 8rem 2rem;
  background: var(--bg-elevated);
}

.features-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 5rem;
}

.feature-block {
  position: relative;
  padding-left: 5rem;
}

.feature-number {
  position: absolute;
  left: 0;
  top: -0.2rem;
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent);
  opacity: 0.3;
}

.feature-block h3 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
}

.feature-block p {
  font-size: 1rem;
  color: var(--fg-muted);
  line-height: 1.7;
  max-width: 600px;
}

/* ===== CATEGORIES ===== */
.categories {
  padding: 6rem 2rem;
  background: var(--bg);
}

.categories-inner {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.categories-inner h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 2.5rem;
  letter-spacing: -0.02em;
}

.category-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: center;
}

.cat-pill {
  display: inline-block;
  padding: 0.5rem 1.2rem;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 2rem;
  font-size: 0.85rem;
  color: var(--fg-muted);
  background: var(--bg-elevated);
  transition: all 0.2s ease;
}

.cat-pill:hover {
  border-color: var(--accent-dim);
  color: var(--accent);
  background: var(--accent-glow);
}

/* ===== CLOSING ===== */
.closing {
  padding: 10rem 2rem;
  text-align: center;
  background: radial-gradient(ellipse at 50% 80%, rgba(245, 158, 11, 0.08) 0%, transparent 60%);
}

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

.closing h2 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.closing-sub {
  font-size: 1.1rem;
  color: var(--fg-muted);
  line-height: 1.7;
}

/* ===== FOOTER ===== */
.site-footer {
  padding: 3rem 2rem;
  border-top: 1px solid rgba(255,255,255,0.04);
}

.footer-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--fg);
}

.footer-tagline {
  font-size: 0.8rem;
  color: var(--fg-muted);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .hero {
    padding: 4rem 1.5rem 3rem;
  }

  .concept-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .concept-left h2 {
    position: static;
  }

  .features {
    padding: 5rem 1.5rem;
  }

  .feature-block {
    padding-left: 3.5rem;
  }

  .feature-number {
    font-size: 1.8rem;
  }

  .closing {
    padding: 6rem 1.5rem;
  }

  .footer-inner {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 3rem 1.2rem 2rem;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .sound-wave {
    gap: 3px;
  }

  .sound-wave .bar {
    width: 2px;
  }
}