:root {
  --bg: #0a0a0f;
  --bg-warm: #111118;
  --fg: #e8e6e1;
  --fg-dim: #8a8780;
  --accent: #e85d3a;
  --accent-glow: rgba(232, 93, 58, 0.15);
  --public-color: #3ae8b0;
  --private-color: #e8c93a;
  --font-display: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  --max-w: 1200px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 8rem;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  overflow-x: hidden;
}

/* ========== HERO ========== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space-md);
  overflow: hidden;
  background: radial-gradient(ellipse 80% 60% at 50% 40%, rgba(232, 93, 58, 0.06) 0%, transparent 70%),
              var(--bg);
}

.hero-grain {
  position: absolute;
  inset: 0;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  pointer-events: none;
}

.nav {
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
}

.logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.3rem;
  letter-spacing: -0.02em;
  color: var(--fg);
}

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

.hero-kicker {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: var(--space-sm);
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-md);
}

.hero h1 em {
  font-style: italic;
  color: var(--accent);
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--fg-dim);
  max-width: 580px;
  margin: 0 auto;
  line-height: 1.7;
}

.hero-scroll-hint {
  position: absolute;
  bottom: var(--space-md);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.hero-scroll-hint span {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--fg-dim);
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--fg-dim), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

/* ========== CONCEPT ========== */
.concept {
  padding: var(--space-xl) var(--space-md);
  border-top: 1px solid rgba(255,255,255,0.05);
}

.concept-grid {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--space-lg);
  align-items: start;
}

.concept-label {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--fg-dim);
  padding-top: 0.5rem;
}

.concept-text h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.concept-text p {
  font-size: 1.1rem;
  color: var(--fg-dim);
  max-width: 620px;
  line-height: 1.75;
}

/* ========== FEATURES ========== */
.features {
  padding: var(--space-xl) var(--space-md);
}

.features-header {
  max-width: var(--max-w);
  margin: 0 auto var(--space-lg);
}

.features-header h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.features-duo {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.feature-card {
  background: var(--bg-warm);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 16px;
  padding: var(--space-lg) var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  transition: border-color 0.3s ease;
}

.feature-card:hover {
  border-color: rgba(255,255,255,0.12);
}

.feature-tag {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  width: fit-content;
  padding: 0.3rem 0.8rem;
  border-radius: 100px;
}

.feature-public .feature-tag {
  background: rgba(58, 232, 176, 0.1);
  color: var(--public-color);
}

.feature-private .feature-tag {
  background: rgba(232, 201, 58, 0.1);
  color: var(--private-color);
}

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

.feature-card p {
  color: var(--fg-dim);
  line-height: 1.7;
  font-size: 0.95rem;
}

.feature-visual {
  margin-top: auto;
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255,255,255,0.05);
}

.scene-line {
  font-family: var(--font-body);
  font-style: italic;
  font-size: 1.05rem;
  color: var(--fg);
  margin-bottom: 0.5rem;
}

.scene-meta {
  font-size: 0.75rem;
  color: var(--fg-dim);
  letter-spacing: 0.05em;
}

/* ========== AUDIENCE ========== */
.audience {
  padding: var(--space-xl) var(--space-md);
  background: radial-gradient(ellipse 70% 50% at 50% 100%, rgba(232, 93, 58, 0.04) 0%, transparent 70%);
}

.audience-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.audience h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-lg);
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.audience-item {
  padding: var(--space-md) 0;
  border-top: 2px solid var(--accent);
}

.audience-role {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  display: block;
  margin-bottom: 0.75rem;
}

.audience-item p {
  color: var(--fg-dim);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ========== CLOSING ========== */
.closing {
  padding: var(--space-xl) var(--space-md);
  text-align: center;
}

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

.closing h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-md);
}

.closing-sub {
  font-size: 1.1rem;
  color: var(--fg-dim);
  line-height: 1.75;
}

/* ========== FOOTER ========== */
.footer {
  padding: var(--space-lg) var(--space-md);
  border-top: 1px solid rgba(255,255,255,0.05);
}

.footer-inner {
  max-width: var(--max-w);
  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;
}

.footer-tagline {
  font-size: 0.85rem;
  color: var(--fg-dim);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
  :root {
    --space-xl: 5rem;
    --space-lg: 3rem;
  }

  .concept-grid {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  .concept-label {
    padding-top: 0;
  }

  .features-duo {
    grid-template-columns: 1fr;
  }

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

  .footer-inner {
    flex-direction: column;
    gap: var(--space-xs);
    text-align: center;
  }

  .hero-scroll-hint {
    display: none;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

  .hero {
    padding: var(--space-lg) var(--space-sm);
  }

  .feature-card {
    padding: var(--space-md) var(--space-sm);
  }
}