/* ==========================================================================
   RESET E CONFIGURAÇÕES BÁSICAS
   ========================================================================== */

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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  min-height: 100vh;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  line-height: 1.6;
}

/* ==========================================================================
   CONTAINER PRINCIPAL
   ========================================================================== */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

/* ==========================================================================
   CABEÇALHO
   ========================================================================== */

.header {
  text-align: center;
  color: white;
  margin-bottom: 40px;
  padding: 40px 20px;
}

.header h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.header p {
  font-size: 1.2rem;
  opacity: 0.9;
}

/* ==========================================================================
   NAVBAR - USANDO FLEXBOX
   ========================================================================== */

.navbar {
  /* FLEXBOX: Transforma em container flexível */
  display: flex;
  /* FLEXBOX: Espaça elementos nas extremidades */
  justify-content: space-between;
  /* FLEXBOX: Alinha verticalmente ao centro */
  align-items: center;
  /* GRADIENTE: Fundo com transparência */
  background: linear-gradient(
    90deg,
    rgba(0, 0, 0, 0.3) 0%,
    rgba(255, 255, 255, 0.1) 50%,
    rgba(0, 0, 0, 0.3) 100%
  );
  padding: 20px 30px;
  border-radius: 25px;
  backdrop-filter: blur(15px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  margin-bottom: 40px;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: white;
}

.nav-menu {
  display: flex;
  gap: 30px;
  list-style: none;
}

.nav-menu a {
  text-decoration: none;
  color: white;
  padding: 10px 20px;
  border-radius: 20px;
  transition: all 0.3s ease;
}

.nav-menu a:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

/* ==========================================================================
   CARDS - FLEXBOX + GRADIENTES
   ========================================================================== */

.cards-containers {
  /* FLEXBOX: Container flexível */
  display: flex;
  /* FLEXBOX: Permite quebra de linha */
  flex-wrap: wrap;
  /* FLEXBOX: Espaço entre cards */
  gap: 25px;
  /* FLEXBOX: Centraliza os cards */
  justify-content: center;
  margin-bottom: 50px;
}

.card {
  /* FLEXBOX: Cresce, encolhe, base 300px */
  flex: 1 1 300px;
  max-width: 350px;
  min-height: 250px;
  padding: 30px;
  border-radius: 20px;
  color: white;
  cursor: pointer;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.card:hover {
  transform: translateY(-10px) scale(1.02);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

/* GRADIENTES: Diferentes cores para cada card */

.card-red {
  background: linear-gradient(
    135deg,
    rgba(255, 107, 107, 0.8) 0%,
    rgba(255, 142, 83, 0.8) 100%
  );
}

.card-blue {
  background: linear-gradient(
    135deg,
    rgba(74, 144, 226, 0.8) 0%,
    rgba(80, 170, 255, 0.8) 100%
  );
}

.card-green {
  background: linear-gradient(
    135deg,
    rgba(126, 213, 111, 0.8) 0%,
    rgba(40, 180, 133, 0.8) 100%
  );
}

.card h3 {
  font-size: 1.5rem;
  margin-bottom: 15px;
}

.card p {
  opacity: 0.9;
}

/* ==========================================================================
   FEATURES GRID - FLEXBOX
   ========================================================================== */

.features-grid {
  /* FLEXBOX: Container flexível */
  display: flex;
  /* FLEXBOX: Permite quebra de linha */
  flex-wrap: wrap;
  /* FLEXBOX: Espaço entre itens */
  gap: 20px;
  margin: 40px 0;
}

.feature {
  /* FLEXBOX: Cada item cresce igualmente, base 250px */
  flex: 1 1 250px;
  padding: 25px;
  border-radius: 15px;
  text-align: center;
  color: white;

  /* GRADIENTE: Radial com transparência */
  background: radial-gradient(
    circle at center,
    rgba(255, 255, 255, 0.15) 0%,
    rgba(255, 255, 255, 0.05) 70%,
    transparent 100%
  );

  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: transform 0.3s ease;
}

.feature:hover {
  transform: scale(1.05);
  background: radial-gradient(
    circle at center,
    rgba(255, 255, 255, 0.25) 0%,
    rgba(255, 255, 255, 0.1) 70%,
    transparent 100%
  );
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: 15px;
}

.feature h4 {
  margin-bottom: 10px;
  font-size: 1.2rem;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

.footer {
  /* FLEXBOX: Centraliza conteúdo */
  display: flex;
  justify-content: center;
  align-items: center;

  padding: 30px;
  margin-top: 50px;

  /* GRADIENTE: Fundo escuro com transparência */
  background: linear-gradient(
    135deg,
    rgba(0, 0, 0, 0.4) 0%,
    rgba(255, 255, 255, 0.1) 100%
  );

  border-radius: 20px;
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.footer p {
  color: white;
  font-size: 1.1rem;
}

* ==========================================================================
   RESPONSIVIDADE - MOBILE FIRST
   ========================================================================== */

/* Tablets e telas menores */
@media (max-width: 768px) {
  .navbar {
    /* FLEXBOX: Muda para coluna em mobile */
    flex-direction: column;
    gap: 20px;
    padding: 20px;
  }

  .nav-menu {
    gap: 15px;
    /* FLEXBOX: Permite quebra de linha */
    flex-wrap: wrap;
    /* FLEXBOX: Centraliza itens */
    justify-content: center;
  }

  .cards-container {
    /* FLEXBOX: Força direção coluna */
    flex-direction: column;
    /* FLEXBOX: Centraliza cards */
    align-items: center;
  }

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

  .container {
    padding: 15px;
  }
}

/* Smartphones */
@media (max-width: 480px) {
  .nav-menu {
    /* FLEXBOX: Menu vertical em móveis pequenos */
    flex-direction: column;
    gap: 10px;
    width: 100%;
  }

  .nav-menu a {
    text-align: center;
    display: block;
  }

  .card {
    min-height: 200px;
    padding: 20px;
  }

  .feature {
    min-height: 150px;
    padding: 20px;
  }
}

/* ==========================================================================
   ANIMAÇÕES
   ========================================================================== */
@keyframes aparecer {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card {
  animation: aparecer 0.6s ease forwards;
}

.card:nth-child(2) {
  animation-delay: 0.1s;
}

.card:nth-child(3) {
  animation-delay: 0.2s;
}

.feature {
  animation: aparecer 0.6s ease forwards;
}

.feature:nth-child(2) {
  animation-delay: 0.1s;
}
.feature:nth-child(3) {
  animation-delay: 0.2s;
}
.feature:nth-child(4) {
  animation-delay: 0.3s;
}