/* ============================================
   TALLER DE NIVELACIÓN - QUÍMICA GRADO 11
   Estilo: Cartilla Pre-ICFES Colombiana
   ============================================ */

:root {
  --primary: #1a237e;
  --primary-light: #283593;
  --primary-dark: #0d1452;
  --accent: #42a5f5;
  --accent-light: #80d6ff;
  --accent-dark: #0077c2;
  --bg: #f0f2f5;
  --card-bg: #ffffff;
  --text: #212121;
  --text-light: #546e7a;
  --text-white: #ffffff;
  --sidebar-width: 260px;
  --header-height: 130px;
  --border-radius: 10px;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.12);
  --transition: 0.3s ease;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  min-height: 100vh;
  line-height: 1.6;
}

/* ============================================
   SIDEBAR
   ============================================ */

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: linear-gradient(180deg, var(--primary) 0%, var(--primary-light) 100%);
  z-index: 100;
  display: flex;
  flex-direction: column;
  box-shadow: 2px 0 16px rgba(0, 0, 0, 0.2);
  transition: transform var(--transition);
  overflow: hidden;
}

.sidebar-header {
  padding: 24px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.sidebar-header i {
  font-size: 28px;
  color: var(--accent);
}

.sidebar-header span {
  color: var(--text-white);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 8px 0;
}

.sidebar-nav::-webkit-scrollbar {
  width: 4px;
}

.sidebar-nav::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.2);
  border-radius: 4px;
}

.sidebar-nav::-webkit-scrollbar-track {
  background: transparent;
}

.nav-section {
  margin: 2px 0;
}

.nav-section-title {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  color: rgba(255, 255, 255, 0.85);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  letter-spacing: 0.3px;
  user-select: none;
}

.nav-section-title:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-white);
}

.nav-section-title.active {
  color: var(--accent);
  background: rgba(66, 165, 245, 0.1);
  border-left: 3px solid var(--accent);
}

.nav-section-title .arrow {
  margin-left: auto;
  font-size: 12px;
  transition: transform var(--transition);
}

.nav-section-title .arrow.open {
  transform: rotate(180deg);
}

.nav-sub {
  list-style: none;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.nav-sub.open {
  max-height: 500px;
}

#teoria-sub.open {
  max-height: 350px;
}

#taller-sub.open {
  max-height: 1500px;
}

.nav-sub a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px 8px 32px;
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  font-size: 13px;
  transition: background var(--transition), color var(--transition);
  border-left: 3px solid transparent;
}

.nav-sub a:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-white);
}

.nav-sub a.active {
  background: rgba(66, 165, 245, 0.15);
  color: var(--accent);
  border-left-color: var(--accent);
  font-weight: 600;
}

.nav-sub a i {
  font-size: 6px;
  flex-shrink: 0;
}

.punto-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  background: rgba(66, 165, 245, 0.2);
  border-radius: 50%;
  font-size: 11px;
  font-weight: 700;
  flex-shrink: 0;
}

/* ============================================
   HAMBURGER
   ============================================ */

.hamburger {
  display: none;
  position: fixed;
  top: 14px;
  left: 14px;
  z-index: 200;
  width: 42px;
  height: 42px;
  background: var(--primary);
  color: var(--text-white);
  border-radius: 8px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 20px;
  box-shadow: var(--shadow);
  transition: background var(--transition);
}

.hamburger:hover {
  background: var(--primary-light);
}

/* ============================================
   OVERLAY (MOBILE)
   ============================================ */

.overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 90;
  opacity: 0;
  transition: opacity var(--transition);
}

.overlay.visible {
  display: block;
  opacity: 1;
}

/* ============================================
   MAIN WRAPPER
   ============================================ */

.main-wrapper {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: margin-left var(--transition);
}

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

.main-header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: var(--text-white);
  flex-shrink: 0;
  position: relative;
}

.header-content {
  padding: 28px 36px 20px;
  text-align: center;
}

.header-icon {
  font-size: 36px;
  color: var(--accent);
  margin-bottom: 8px;
}

.main-header h1 {
  font-size: 26px;
  font-weight: 700;
  margin-bottom: 4px;
  letter-spacing: 0.5px;
}

.header-subtitle {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  font-weight: 400;
}

.header-bar {
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light), var(--accent-dark));
}

/* ============================================
   CONTENT AREA
   ============================================ */

.content-area {
  flex: 1;
  padding: 28px 36px;
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
  animation: fadeIn 0.35s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   WELCOME PAGE
   ============================================ */

.welcome-page {
  display: flex;
  justify-content: center;
  padding-top: 12px;
}

.welcome-card {
  background: var(--card-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 40px;
  max-width: 800px;
  width: 100%;
  text-align: center;
}

.welcome-icon {
  font-size: 56px;
  color: var(--accent);
  margin-bottom: 16px;
}

.welcome-card h2 {
  color: var(--primary);
  font-size: 24px;
  margin-bottom: 12px;
}

.welcome-desc {
  color: var(--text-light);
  font-size: 15px;
  max-width: 600px;
  margin: 0 auto 28px;
  line-height: 1.7;
}

.institucion-info {
  background: #f8f9fb;
  border-radius: 8px;
  padding: 20px 24px;
  margin-bottom: 28px;
  text-align: left;
}

.info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.info-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 14px;
}

.info-item i {
  color: var(--accent);
  font-size: 15px;
  margin-top: 2px;
  flex-shrink: 0;
}

.info-item strong {
  color: var(--primary);
  flex-shrink: 0;
}

.info-item span {
  color: var(--text-light);
}

.welcome-nav h3 {
  color: var(--primary);
  font-size: 18px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.como-usar-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}

.paso-card {
  background: #f8f9fb;
  border-radius: 8px;
  padding: 20px 14px;
  text-align: center;
  position: relative;
  transition: transform var(--transition), box-shadow var(--transition);
}

.paso-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.paso-numero {
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 28px;
  height: 28px;
  background: var(--accent);
  color: var(--text-white);
  border-radius: 50%;
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.paso-card i {
  font-size: 26px;
  color: var(--primary);
  margin: 10px 0 8px;
}

.paso-card p {
  font-size: 13px;
  color: var(--text-light);
  line-height: 1.5;
}

.welcome-mensaje {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: var(--text-white);
  padding: 18px 24px;
  border-radius: 8px;
  font-size: 15px;
  font-style: italic;
  line-height: 1.6;
}

/* ============================================
   CONTENT CARDS (genéricas para páginas)
   ============================================ */

.content-area h1 {
  color: var(--primary-dark);
  font-size: 24px;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 3px solid var(--accent);
}

.content-area h2 {
  color: var(--primary-light);
  font-size: 20px;
  margin: 24px 0 12px;
  padding-left: 12px;
  border-left: 4px solid var(--accent);
}

.content-area h3 {
  color: var(--primary);
  font-size: 17px;
  margin: 18px 0 8px;
}

.card {
  background: var(--card-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 20px;
}

.card-title {
  color: var(--primary);
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent);
}

/* ============================================
   TABLES
   ============================================ */

.content-area table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
  background: var(--card-bg);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.content-area table thead {
  background: var(--primary);
  color: var(--text-white);
}

.content-area table th {
  padding: 12px 14px;
  text-align: left;
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.3px;
}

.content-area table td {
  padding: 10px 14px;
  border-bottom: 1px solid #e8edf2;
}

.content-area table tbody tr:nth-child(even) {
  background: #f8f9fb;
}

.content-area table tbody tr:hover {
  background: #e3f0fd;
}

/* ============================================
   CODE / FORMULAS
   ============================================ */

.formula {
  display: inline-block;
  background: #f0f4f8;
  border: 1px solid #d0dbe6;
  border-radius: 6px;
  padding: 4px 10px;
  font-family: 'Courier New', monospace;
  font-size: 14px;
  color: var(--primary-dark);
  margin: 2px 0;
}

.formula-block {
  display: block;
  background: #f0f4f8;
  border: 1px solid #d0dbe6;
  border-left: 4px solid var(--accent);
  border-radius: 0 8px 8px 0;
  padding: 14px 18px;
  margin: 12px 0;
  font-family: 'Courier New', monospace;
  font-size: 15px;
  color: var(--primary-dark);
  text-align: center;
}

.math-block {
  display: block;
  background: #e8eaf6;
  border: 1px solid #c5cae9;
  border-radius: 8px;
  padding: 16px 20px;
  margin: 12px 0;
  font-family: 'Courier New', monospace;
  font-size: 15px;
  color: var(--primary-dark);
  text-align: center;
  letter-spacing: 0.5px;
}

/* ============================================
   IMPORTANT BLOCK (borde azul)
   ============================================ */

.important {
  background: #e8eaf6;
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  padding: 16px 20px;
  margin: 16px 0;
  font-size: 14px;
  color: var(--primary-dark);
  line-height: 1.7;
}

.important strong,
.important::before {
  color: var(--primary);
}

/* ============================================
   SOLUCION STEPS (DATOS → FÓRMULA → ...)
   ============================================ */

.solucion-steps {
  margin: 16px 0;
}

.solucion-step {
  display: flex;
  gap: 14px;
  margin-bottom: 12px;
  align-items: flex-start;
}

.step-label {
  background: var(--accent);
  color: var(--text-white);
  font-weight: 700;
  font-size: 12px;
  padding: 4px 12px;
  border-radius: 20px;
  flex-shrink: 0;
  min-width: 70px;
  text-align: center;
  letter-spacing: 0.3px;
}

.step-content {
  flex: 1;
  background: var(--card-bg);
  border-radius: 8px;
  padding: 10px 16px;
  box-shadow: var(--shadow);
  font-size: 14px;
  border: 1px solid #e8edf2;
}

/* ============================================
   LISTS
   ============================================ */

.content-area ul:not(.sin-estilo) {
  list-style: none;
  padding-left: 0;
  margin: 12px 0;
}

.content-area ul:not(.sin-estilo) li {
  padding: 6px 0 6px 24px;
  position: relative;
}

.content-area ul:not(.sin-estilo) li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 13px;
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
}

.content-area ol {
  padding-left: 24px;
  margin: 12px 0;
}

.content-area ol li {
  padding: 4px 0;
}

/* ============================================
   PAGE LOADER
   ============================================ */

.page-loader {
  display: none;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 300;
}

.page-loader.active {
  display: block;
}

.spinner {
  width: 44px;
  height: 44px;
  border: 4px solid #d0dbe6;
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ============================================
   PAGE CONTENT WRAPPER
   ============================================ */

.page-content {
  animation: fadeIn 0.35s ease;
}

/* ============================================
   DATOS BOX (Pasos de estequiometría)
   ============================================ */

.datos-box {
  background: #e8f0fe;
  border-left: 4px solid var(--accent);
  border-radius: 0 8px 8px 0;
  padding: 14px 18px;
  margin: 12px 0;
  font-size: 14px;
}

.datos-box strong {
  color: var(--primary);
}

/* ============================================
   PASOS RESOLUCIÓN
   ============================================ */

.pasos-resolucion {
  margin: 16px 0;
  padding: 16px 20px;
  background: #fafbfc;
  border: 1px solid #e0e6ed;
  border-radius: 8px;
}

.pasos-resolucion p {
  padding: 4px 0 4px 12px;
  border-left: 3px solid var(--accent);
  margin: 6px 0;
}

/* ============================================
   EJEMPLO BOX
   ============================================ */

.ejemplo-box {
  background: #e8f5e9;
  border: 1px solid #a5d6a7;
  border-left: 5px solid #43a047;
  border-radius: 0 8px 8px 0;
  padding: 16px 20px;
  margin: 14px 0;
  font-size: 14px;
}

.ejemplo-box::before {
  content: "EJEMPLO";
  display: block;
  font-weight: 700;
  color: #2e7d32;
  font-size: 12px;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

/* ============================================
   EJERCICIO BOX
   ============================================ */

.ejercicio-box {
  background: #fff3e0;
  border: 1px solid #ffcc80;
  border-left: 5px solid #ef6c00;
  border-radius: 0 8px 8px 0;
  padding: 16px 20px;
  margin: 14px 0;
  font-size: 14px;
}

.ejercicio-box::before {
  content: "EJERCICIO";
  display: block;
  font-weight: 700;
  color: #e65100;
  font-size: 12px;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

/* ============================================
   NOTA BOX
   ============================================ */

.nota-box {
  background: #fffde7;
  border: 1px solid #fff59d;
  border-left: 5px solid #f9a825;
  border-radius: 0 8px 8px 0;
  padding: 14px 20px;
  margin: 14px 0;
  font-size: 14px;
}

.nota-box::before {
  content: "NOTA";
  display: block;
  font-weight: 700;
  color: #f57f17;
  font-size: 12px;
  letter-spacing: 1px;
  margin-bottom: 6px;
}

/* ============================================
   DEFINICIÓN BOX
   ============================================ */

.definicion {
  background: #e8eaf6;
  border-left: 5px solid var(--primary);
  border-radius: 0 8px 8px 0;
  padding: 16px 20px;
  margin: 14px 0;
  font-size: 14px;
  color: var(--primary-dark);
}

.definicion::before {
  content: "DEFINICIÓN";
  display: block;
  font-weight: 700;
  color: var(--primary);
  font-size: 12px;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

/* ============================================
   ECUACIÓN BOX
   ============================================ */

.ecuacion-box {
  background: #f5f5f5;
  border: 1px solid #d0d0d0;
  border-radius: 8px;
  padding: 14px 18px;
  margin: 12px 0;
  text-align: center;
  font-family: 'Courier New', Courier, monospace;
  font-size: 15px;
  font-weight: 600;
  color: var(--primary-dark);
  letter-spacing: 0.5px;
}

/* ============================================
   TABLE COMPARATIVA
   ============================================ */

.table-comparativa {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
  background: var(--card-bg);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.table-comparativa thead {
  background: var(--primary);
  color: var(--text-white);
}

.table-comparativa th {
  padding: 12px 14px;
  text-align: left;
  font-weight: 600;
  font-size: 13px;
}

.table-comparativa td {
  padding: 10px 14px;
  border-bottom: 1px solid #e8edf2;
}

.table-comparativa tbody tr:nth-child(even) {
  background: #f8f9fb;
}

.table-comparativa tbody tr:hover {
  background: #e3f0fd;
}

/* ============================================
   CUADRO COMPARATIVO
   ============================================ */

.cuadro-comparativo {
  background: var(--card-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 20px 24px;
  margin: 16px 0;
}

.cuadro-comparativo table {
  width: 100%;
  border-collapse: collapse;
}

.cuadro-comparativo th {
  background: var(--primary);
  color: white;
  padding: 10px 12px;
  font-size: 13px;
}

.cuadro-comparativo td {
  padding: 10px 12px;
  border-bottom: 1px solid #e8edf2;
  font-size: 13px;
}

/* ============================================
   ICFES PREGUNTA
   ============================================ */

.icfes-pregunta {
  background: var(--card-bg);
  border: 1px solid #d0dbe6;
  border-radius: var(--border-radius);
  padding: 20px 24px;
  margin: 18px 0;
  box-shadow: var(--shadow);
}

.icfes-pregunta .contexto {
  background: #e8eaf6;
  padding: 10px 14px;
  border-radius: 6px;
  margin-bottom: 12px;
  font-size: 13px;
  color: var(--text-light);
  font-style: italic;
}

.icfes-pregunta .enunciado {
  font-weight: 500;
  margin-bottom: 14px;
  font-size: 14px;
  line-height: 1.6;
}

.icfes-pregunta .opciones {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 14px;
}

.icfes-pregunta .opcion {
  background: #f8f9fb;
  padding: 10px 14px;
  border-radius: 6px;
  font-size: 13px;
  border: 1px solid #e0e6ed;
}

.icfes-pregunta .respuesta {
  background: #e8f5e9;
  padding: 12px 16px;
  border-radius: 6px;
  margin-top: 10px;
  font-size: 13px;
  border-left: 4px solid #43a047;
}

/* ============================================
   VIÑETA (Historieta)
   ============================================ */

.vineta {
  background: var(--card-bg);
  border: 1px solid #e0e6ed;
  border-radius: 12px;
  padding: 20px 24px;
  margin: 14px 0;
  box-shadow: var(--shadow);
  position: relative;
}

.vineta .vineta-numero {
  position: absolute;
  top: -12px;
  left: 16px;
  background: var(--accent);
  color: white;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 13px;
}

.vineta .escena {
  color: var(--text-light);
  font-size: 13px;
  margin-bottom: 8px;
  font-style: italic;
}

.vineta .dialogo {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
}

.vineta .explicacion {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed #d0dbe6;
  font-size: 13px;
  color: var(--primary);
}

/* ============================================
   MÉTODO BOX (Reactivo límite)
   ============================================ */

.metodo-box {
  background: #e3f2fd;
  border: 1px solid #90caf9;
  border-radius: 8px;
  padding: 16px 20px;
  margin: 14px 0;
}

.metodo-box::before {
  content: "MÉTODO";
  display: block;
  font-weight: 700;
  color: #1565c0;
  font-size: 12px;
  letter-spacing: 1px;
  margin-bottom: 10px;
}

/* ============================================
   AUTOEVALUACIÓN
   ============================================ */

.autoevaluacion-seccion {
  background: var(--card-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 20px 24px;
  margin: 16px 0;
}

.autoevaluacion-seccion h3 {
  color: var(--primary);
  font-size: 17px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent);
}

/* ============================================
   REFERENCIAS LISTA
   ============================================ */

.referencias-lista {
  background: var(--card-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 24px 28px;
  margin: 16px 0;
}

.referencias-lista h2 {
  margin-top: 20px;
}

.referencias-lista ol {
  padding-left: 20px;
}

.referencias-lista ol li {
  padding: 8px 0;
  font-size: 14px;
  line-height: 1.6;
}

/* ============================================
   FORMULA INLINE
   ============================================ */

.formula-inline {
  display: inline;
  background: #f0f4f8;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  font-size: 13px;
  color: var(--primary-dark);
}

/* ============================================
   SEPARADOR / HR
   ============================================ */

.content-area hr {
  border: none;
  border-top: 1px solid #d0dbe6;
  margin: 20px 0;
}

/* ============================================
   STRONG / BOLD dentro de contenido
   ============================================ */

.page-content strong {
  color: var(--primary-dark);
}

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

.main-footer {
  background: var(--primary-dark);
  color: rgba(255, 255, 255, 0.65);
  text-align: center;
  padding: 18px 20px;
  flex-shrink: 0;
  font-size: 13px;
  line-height: 1.6;
  margin-top: auto;
}

/* ============================================
   RESPONSIVE - TABLET / MOBILE
   ============================================ */

@media (max-width: 768px) {
  :root {
    --sidebar-width: 0px;
  }

  .sidebar {
    transform: translateX(-100%);
    width: 270px;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .main-wrapper {
    margin-left: 0;
  }

  .hamburger {
    display: flex;
  }

  .header-content {
    padding: 20px 16px 16px;
  }

  .main-header h1 {
    font-size: 20px;
  }

  .header-icon {
    font-size: 28px;
  }

  .content-area {
    padding: 18px 16px;
  }

  .como-usar-grid {
    grid-template-columns: 1fr;
  }

  .info-grid {
    grid-template-columns: 1fr;
  }

  .welcome-card {
    padding: 24px 16px;
  }
}

@media (max-width: 480px) {
  .main-header h1 {
    font-size: 17px;
  }

  .header-subtitle {
    font-size: 12px;
  }

  .content-area {
    padding: 14px 10px;
  }

  .content-area h1 {
    font-size: 20px;
  }

  .content-area h2 {
    font-size: 17px;
  }

  .content-area table {
    font-size: 12px;
  }

  .content-area table th,
  .content-area table td {
    padding: 8px 8px;
  }

  .solucion-step {
    flex-direction: column;
    gap: 6px;
  }

  .card {
    padding: 16px 14px;
  }

  .welcome-card {
    padding: 18px 12px;
  }

  .paso-card {
    padding: 14px 10px;
    font-size: 12px;
  }
}