/* Reset y configuración base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: #333;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
}

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

/* Header */
.header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
  padding: 2rem 0;
  text-align: center;
  margin-bottom: 2rem;
}

.header h1 {
  font-size: 2.5rem;
  color: #2c3e50;
  margin-bottom: 0.5rem;
}

.header p {
  color: #7f8c8d;
  font-size: 1.2rem;
}

/* Main content */
.main {
  padding: 2rem 0;
}

/* Ejercicios */
.exercise {
  background: rgba(255, 255, 255, 0.95);
  border-radius: 20px;
  padding: 2rem;
  margin-bottom: 3rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.exercise h2 {
  color: #2c3e50;
  font-size: 1.8rem;
  margin-bottom: 1rem;
  border-bottom: 3px solid #667eea;
  padding-bottom: 0.5rem;
}

.exercise p {
  color: #555;
  margin-bottom: 1.5rem;
}

.exercise code {
  background: #f0f0f0;
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  font-family: "Courier New", monospace;
  color: #e74c3c;
}

/* Áreas de demostración */
.demo-area {
  border: 3px dashed #667eea;
  padding: 2rem;
  margin: 1.5rem 0;
  min-height: 200px;
  background: #f8f9fa;
  border-radius: 10px;
  position: relative;
}

/* Cajas de ejemplo */
.box {
  width: 100px;
  height: 80px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  border-radius: 10px;
  margin: 10px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.box:hover {
  transform: scale(1.05);
}

/* Posicionamiento específico */
.static-box {
  position: static;
}

.relative-box {
  position: relative;
}

.relative-box.moved {
  top: 20px;
  left: 30px;
  background: linear-gradient(135deg, #e74c3c, #c0392b);
}

.absolute-container {
  position: relative;
  height: 300px;
}

.absolute-box {
  position: absolute;
  width: 120px;
  height: 80px;
  font-size: 0.9rem;
}

.top-left {
  top: 20px;
  left: 20px;
  background: linear-gradient(135deg, #3498db, #2980b9);
}

.top-right {
  top: 20px;
  right: 20px;
  background: linear-gradient(135deg, #e67e22, #d35400);
}

.bottom-left {
  bottom: 20px;
  left: 20px;
  background: linear-gradient(135deg, #9b59b6, #8e44ad);
}

.bottom-right {
  bottom: 20px;
  right: 20px;
  background: linear-gradient(135deg, #1abc9c, #16a085);
}

.center {
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: linear-gradient(135deg, #f39c12, #e67e22);
}

.fixed-box {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: linear-gradient(135deg, #e74c3c, #c0392b);
  z-index: 1000;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  box-shadow: 0 5px 20px rgba(231, 76, 60, 0.4);
}

/* Sticky example */
.sticky-container {
  border: 2px solid #3498db;
  border-radius: 10px;
  overflow: hidden;
  margin: 1.5rem 0;
}

.sticky-header {
  position: sticky;
  top: 0;
  background: linear-gradient(135deg, #3498db, #2980b9);
  color: white;
  padding: 1rem;
  text-align: center;
  font-weight: bold;
  z-index: 100;
}

.content {
  background: white;
  padding: 2rem;
  min-height: 500px;
}

.content p {
  margin-bottom: 1rem;
  color: #555;
}

/* Ejemplos de código */
.code-example {
  background: #2c3e50;
  color: #ecf0f1;
  padding: 1.5rem;
  border-radius: 10px;
  margin: 1.5rem 0;
}

.code-example h3 {
  color: #3498db;
  margin-bottom: 1rem;
}

.code-example pre {
  background: #34495e;
  padding: 1rem;
  border-radius: 5px;
  overflow-x: auto;
}

.code-example code {
  background: none;
  color: #ecf0f1;
  padding: 0;
}

/* Ejercicio práctico */
.practice-area {
  border: 3px solid #27ae60;
  border-radius: 10px;
  overflow: hidden;
  margin: 1.5rem 0;
  min-height: 400px;
  position: relative;
}

.practice-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: linear-gradient(135deg, #27ae60, #2ecc71);
  color: white;
  padding: 1rem;
  text-align: center;
  font-weight: bold;
  z-index: 1001;
}

.practice-nav {
  position: sticky;
  top: 60px;
  background: linear-gradient(135deg, #34495e, #2c3e50);
  color: white;
  padding: 0.8rem;
  text-align: center;
  font-weight: bold;
  z-index: 1000;
}

.practice-content {
  padding: 80px 2rem 2rem 2rem;
  background: #f8f9fa;
  min-height: 300px;
}

.practice-container {
  position: relative;
  height: 200px;
  border: 2px dashed #27ae60;
  border-radius: 10px;
  background: white;
}

.practice-centered {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: linear-gradient(135deg, #27ae60, #2ecc71);
  color: white;
  padding: 1rem 2rem;
  border-radius: 10px;
  font-weight: bold;
  box-shadow: 0 4px 15px rgba(39, 174, 96, 0.3);
}

.practice-button {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: linear-gradient(135deg, #e74c3c, #c0392b);
  color: white;
  padding: 1rem 2rem;
  border-radius: 25px;
  font-weight: bold;
  box-shadow: 0 5px 20px rgba(231, 76, 60, 0.4);
  z-index: 1002;
  cursor: pointer;
  transition: all 0.3s ease;
}

.practice-button:hover {
  transform: scale(1.1);
}

/* Footer */
.footer {
  background: rgba(44, 62, 80, 0.95);
  color: white;
  text-align: center;
  padding: 2rem 0;
  margin-top: 3rem;
}

.btn-back {
  display: inline-block;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  text-decoration: none;
  padding: 0.8rem 1.5rem;
  border-radius: 25px;
  margin-top: 1rem;
  transition: all 0.3s ease;
}

.btn-back:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

/* Responsive */
@media (max-width: 768px) {
  .header h1 {
    font-size: 2rem;
  }

  .exercise {
    padding: 1.5rem;
  }

  .demo-area {
    padding: 1rem;
  }

  .box {
    width: 80px;
    height: 60px;
    font-size: 0.8rem;
  }

  .absolute-box {
    width: 100px;
    height: 60px;
    font-size: 0.7rem;
  }

  .practice-content {
    padding: 60px 1rem 1rem 1rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 10px;
  }

  .header h1 {
    font-size: 1.5rem;
  }

  .exercise h2 {
    font-size: 1.5rem;
  }

  .box {
    width: 70px;
    height: 50px;
    font-size: 0.7rem;
    margin: 5px;
  }

  .absolute-box {
    width: 80px;
    height: 50px;
    font-size: 0.6rem;
  }
}