:root {
  --bg-dark: #0b0f19;
  --bg-light: #f8fafc;
  --soft-dark: #111827;
  --soft-light: #eef2f7;
  --text-dark: #e5e7eb;
  --text-light: #020617;
  --accent: #22c55e;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Inter, system-ui, sans-serif;
}

body {
  background: var(--bg-dark);
  color: var(--text-dark);
  transition: 0.3s;
}

body.light {
  background: var(--bg-light);
  color: var(--text-light);
}

/* NAVBAR */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  position: sticky;
  top: 0;
  background: inherit;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--accent);
  font-weight: 600;
}

.brand img {
  width: 34px;
}

nav {
  display: flex;
  gap: 22px;
}

nav a {
  text-decoration: none;
  color: inherit;
  font-weight: 500;
}

.nav-actions {
  display: flex;
  gap: 10px;
}

.menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--accent);
}

/* HERO */
.hero {
  padding: 90px 20px 70px;
  text-align: center;
}

.hero h1 {
  font-size: 2.5rem;
}

.hero p {
  margin-top: 12px;
  opacity: 0.9;
}

.hero-buttons {
  margin-top: 26px;
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* SECTIONS */
.section {
  padding: 70px 20px;
  max-width: 900px;
  margin: auto;
  text-align: center;
}

.soft {
  background: var(--soft-dark);
}

body.light .soft {
  background: var(--soft-light);
}

.section h2 {
  font-size: 1.9rem;
  margin-bottom: 16px;
}

.section p {
  max-width: 700px;
  margin: auto;
  line-height: 1.6;
}

/* COURSE CARD */
.course-card {
  margin: 30px auto;
  padding: 28px;
  max-width: 420px;
  border-radius: 16px;
  background: rgba(34,197,94,0.08);
}

.course-card ul {
  list-style: none;
  margin: 14px 0;
}

.course-card li {
  margin: 6px 0;
}

.price {
  color: var(--accent);
  font-weight: 600;
}

.note {
  margin-top: 16px;
  opacity: 0.8;
}

/* BUTTONS */
.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-width: 260px;
  padding: 14px 24px;
  border-radius: 14px;
  text-decoration: none;
  font-weight: 600;
  margin-top: 18px;
}

.btn-primary {
  background: linear-gradient(135deg, #22c55e, #16a34a);
  color: #000;
}

.btn-secondary {
  border: 2px solid var(--accent);
  color: var(--accent);
}

/* FOUNDER */
.founder-name {
  font-size: 1.2rem;
  font-weight: 600;
}

.founder-role {
  opacity: 0.8;
  margin-bottom: 16px;
}

/* FOOTER */
footer {
  padding: 40px 20px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* WHATSAPP FLOAT */
.whatsapp-float {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--accent);
  color: #000;
  padding: 14px;
  border-radius: 50%;
  font-size: 26px;
}

/* MOBILE */
@media (max-width: 768px) {
  nav {
    display: none;
    position: absolute;
    top: 64px;
    right: 16px;
    flex-direction: column;
    background: inherit;
    padding: 18px;
    border-radius: 12px;
  }

  nav.show {
    display: flex;
  }

  .menu-btn {
    display: block;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .btn {
    width: 100%;
    max-width: 320px;
  }
}