/* === RESET & BASE === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0d0d0f;
  --bg-2: #141416;
  --bg-3: #1c1c1f;
  --fg: #f0f0f0;
  --fg-2: #999;
  --fg-3: #666;
  --accent: #c8ff00;
  --accent-dim: rgba(200, 255, 0, 0.08);
  --accent-mid: rgba(200, 255, 0, 0.15);
  --font-display: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* === NAV === */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 48px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13,13,15,0.9);
  backdrop-filter: blur(12px);
}

.nav__logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: 0.08em;
}

.nav__tag {
  font-size: 0.75rem;
  color: var(--fg-3);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* === SECTION UTILITIES === */
.section__label {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
  font-family: var(--font-display);
  font-weight: 600;
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.1;
  color: var(--fg);
  margin-bottom: 48px;
}

/* === HERO === */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 48px;
  position: relative;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(200,255,0,0.04) 0%, transparent 70%),
    radial-gradient(ellipse 50% 80% at 20% 80%, rgba(200,255,0,0.02) 0%, transparent 60%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-2);
  margin-bottom: 40px;
  font-family: var(--font-display);
  font-weight: 600;
}

.hero__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero__headline {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 10vw, 8rem);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.02em;
  margin-bottom: 32px;
  color: var(--fg);
}

.hero__line { display: block; }
.hero__line--accent { color: var(--accent); }

.hero__sub {
  font-size: 1.1rem;
  color: var(--fg-2);
  max-width: 520px;
  margin: 0 auto 56px;
  line-height: 1.7;
  font-weight: 300;
}

.hero__stats {
  display: flex;
  gap: 48px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero__stat { text-align: center; }

.hero__stat-value {
  display: block;
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 6px;
}

.hero__stat-label {
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--fg-3);
}

/* === FORMULA === */
.formula {
  background: var(--bg-2);
  padding: 100px 48px;
  border-top: 1px solid rgba(255,255,255,0.05);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.formula__inner { max-width: 900px; margin: 0 auto; }

.formula__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
}

.formula__item {
  background: var(--bg-3);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 12px;
  padding: 28px 24px;
  transition: border-color 0.2s;
}

.formula__item:hover { border-color: rgba(200,255,0,0.3); }

.formula__icon {
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: 16px;
  font-weight: 300;
}

.formula__item h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 8px;
}

.formula__item p {
  font-size: 0.85rem;
  color: var(--fg-2);
  line-height: 1.6;
}

/* === USE CASES === */
.usecases {
  padding: 100px 48px;
  background: var(--bg);
}

.usecases__inner { max-width: 900px; margin: 0 auto; }

.usecases__split {
  display: grid;
  grid-template-columns: 1fr 1px 1fr;
  gap: 0 40px;
  margin-bottom: 48px;
  align-items: start;
}

.usecases__col {}

.usecases__badge {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: 4px;
  margin-bottom: 24px;
}

.usecases__badge--gym {
  background: rgba(200,255,0,0.1);
  color: var(--accent);
  border: 1px solid rgba(200,255,0,0.25);
}

.usecases__badge--night {
  background: rgba(255,200,0,0.1);
  color: #ffc800;
  border: 1px solid rgba(255,200,0,0.25);
}

.usecases__col h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 8px;
}

.usecases__col p {
  font-size: 0.85rem;
  color: var(--fg-2);
  line-height: 1.6;
  margin-bottom: 24px;
}

.usecases__divider {
  background: rgba(255,255,255,0.08);
  width: 1px;
  align-self: stretch;
}

.usecases__tagline {
  font-size: 1rem;
  color: var(--fg-2);
  font-style: italic;
  border-left: 3px solid var(--accent);
  padding-left: 20px;
}

/* === CREDENTIALS === */
.credentials {
  background: var(--bg-2);
  padding: 100px 48px;
  border-top: 1px solid rgba(255,255,255,0.05);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.credentials__inner { max-width: 900px; margin: 0 auto; }

.credentials__list { display: flex; flex-direction: column; gap: 0; }

.credentials__item {
  display: flex;
  align-items: flex-start;
  gap: 28px;
  padding: 28px 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.credentials__item:first-child { border-top: 1px solid rgba(255,255,255,0.06); }

.credentials__num {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: 0.05em;
  min-width: 32px;
  margin-top: 4px;
}

.credentials__item h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 6px;
}

.credentials__item p {
  font-size: 0.85rem;
  color: var(--fg-2);
  line-height: 1.6;
}

/* === VISION === */
.vision {
  padding: 120px 48px;
  background: var(--bg);
  text-align: center;
}

.vision__inner { max-width: 760px; margin: 0 auto; }

.vision__text {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.5vw, 2.8rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--fg);
  margin-bottom: 20px;
}

.vision__sub {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.05em;
}

/* === FOOTER === */
.footer {
  padding: 60px 48px;
  border-top: 1px solid rgba(255,255,255,0.06);
  background: var(--bg);
}

.footer__inner { text-align: center; }

.footer__brand {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.footer__tag {
  font-size: 0.85rem;
  color: var(--fg-3);
  margin-bottom: 16px;
}

.footer__copy {
  font-size: 0.75rem;
  color: var(--fg-3);
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .nav { padding: 16px 24px; }
  .hero { padding: 60px 24px; min-height: 80vh; }
  .hero__stats { gap: 24px; }
  .hero__stat-value { font-size: 2rem; }
  .formula, .usecases, .credentials, .vision { padding: 72px 24px; }
  .footer { padding: 48px 24px; }
  .usecases__split { grid-template-columns: 1fr; gap: 32px; }
  .usecases__divider { display: none; }
  .formula__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .formula__grid { grid-template-columns: 1fr; }
  .hero__headline { font-size: 3rem; }
}