/* ===========================
   RESET + BASE
=========================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
}

body {
  background: #03070e;
  color: #e6e6e6;
  line-height: 1.6;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===========================
   HEADER
=========================== */

header {
  background: #050b16;
  padding: 15px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 2px solid #1e90ff;
}

.logo {
  font-size: 2rem;
  font-weight: 900;
  color: #1e90ff;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.logo span {
  color: #fff;
}

nav a {
  color: #bfcbe0;
  margin-left: 25px;
  text-decoration: none;
  font-weight: 500;
  transition: 0.3s;
}

nav a:hover,
nav a.active {
  color: #1e90ff;
}

/* ===========================
   HERO
=========================== */

.hero {
  padding: 120px 20px;
  text-align: center;
  background: linear-gradient(180deg, #0a1526, #03070e);
  border-bottom: 2px solid #1e90ff55;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 900;
  margin-bottom: 15px;
  text-shadow: 0 0 15px #1e90ff66;
}

.hero p {
  font-size: 1.2rem;
  color: #b0bfd6;
  margin-bottom: 30px;
}

.btn {
  display: inline-block;
  background: #1e90ff;
  padding: 10px 24px;
  border-radius: 10px;
  color: #fff;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: 0.3s;
  text-decoration: none;
}

.btn:hover {
  background: #0c65c4;
  transform: scale(1.05);
}

/* ===========================
   SECCIÓN DE TARJETAS / INFO
=========================== */

.section-title {
  font-size: 2rem;
  margin: 30px 0 10px;
  color: #1e90ff;
}

.lead {
  max-width: 700px;
  margin: 0 auto 25px;
  color: #bfcbe0;
  text-align: center;
}

.cards {
  margin-top: 20px;
  display: grid;
  gap: 25px;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.card {
  background: #0b1626;
  padding: 20px;
  border: 1px solid #1e90ff44;
  border-radius: 12px;
  transition: 0.3s;
  box-shadow: 0 0 0 transparent;
}

.card:hover {
  transform: translateY(-5px);
  border-color: #1e90ff;
  box-shadow: 0 0 20px #1e90ff33;
}

.card h3 {
  color: #1e90ff;
  margin-bottom: 10px;
}

/* ===========================
   QUIZ (TEST / EXAMEN)
=========================== */

#quiz-container {
  background: #050b16;
  border-radius: 12px;
  border: 1px solid #1e90ff44;
  padding: 25px;
  margin: 40px auto 20px;
}

#question {
  font-size: 1.2rem;
  margin-bottom: 18px;
  color: #e6f0ff;
}

#answers {
  margin-bottom: 15px;
}

.answer-btn {
  display: block;
  width: 100%;
  padding: 12px;
  margin-bottom: 10px;
  background: #0d213a;
  border: 1px solid #1e90ff77;
  color: #bcd4ff;
  border-radius: 8px;
  cursor: pointer;
  text-align: left;
  transition: all 0.25s ease;
}

.answer-btn:hover {
  background: #184372;
  border-color: #46a9ff;
  color: #fff;
  transform: scale(1.02);
}

.answer-btn.correct {
  background: #0f6300;
  border-color: #3cff4b;
  color: #e6ffe8;
}

.answer-btn.incorrect {
  background: #8b0000;
  border-color: #ff4d4d;
  color: #ffd6d6;
}

#progress {
  margin-top: 5px;
  font-size: 0.9rem;
  color: #9fb2d6;
}

#form-container {
  margin: 20px auto 40px;
  max-width: 500px;
  background: #050b16;
  border-radius: 12px;
  border: 1px solid #1e90ff44;
  padding: 20px;
  display: none;
}

#form-container input {
  width: 100%;
  padding: 10px;
  margin-bottom: 12px;
  border-radius: 6px;
  border: 1px solid #1e90ff33;
  background: #030a14;
  color: #e6f0ff;
}

#status {
  margin-top: 8px;
  font-size: 0.9rem;
}

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

footer {
  text-align: center;
  padding: 20px;
  background: #050b16;
  border-top: 2px solid #1e90ff33;
  color: #bfcbe0;
  margin-top: 50px;
}

/* ===========================
   RESPONSIVE
=========================== */

@media (max-width: 768px) {
  header {
    padding: 12px 20px;
  }

  .logo {
    font-size: 1.6rem;
  }

  nav a {
    margin-left: 12px;
    font-size: 0.9rem;
  }

  .hero {
    padding: 80px 15px;
  }

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

  #quiz-container {
    padding: 18px;
  }
}