/* --- Importação da Fonte --- */
@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@400;600;700&display=swap");

/* --- Variáveis de Cores (Tema Claro) --- */
:root {
  --primary-color: #1e3a8a;
  --accent-color: #34d399; 
  --text-color: #111827; 
  --secondary-text-color: #d1d5db; 
  --background-color: #f9fafb; 
  --card-background: #ffffff; 
  --border-color: #e5e7eb;
  --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  --card-hover-shadow: 0 7px 15px rgba(0, 0, 0, 0.08);
}

/* --- Tema Escuro --- */
.dark-theme {
  --primary-color: #34d399; 
  --accent-color: #1e3a8a; 
  --text-color: #d1d5db; 
  --secondary-text-color: #9ca3af;
  --background-color: #111827; 
  --card-background: #1f2937; 
  --border-color: #374151;
  --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
  --card-hover-shadow: 0 7px 15px rgba(0, 0, 0, 0.25);
}

/* --- Reset Básico e Estilos Globais --- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Poppins", sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
  transition: background-color 0.3s, color 0.3s;
}

/* --- Cabeçalho e Navegação --- */
.main-header {
  background-color: var(--card-background);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  padding: 1rem 5%;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.main-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand h1 {
  color: var(--primary-color);
  font-size: 1.5rem;
}

/*  --- Container do menu desktop --- */
.nav-menu {
  display: flex;
}

.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-color);
  font-weight: 600;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary-color);
}

/* --- Controles da direita (tema e hambúrguer) --- */
.nav-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* --- Estilos do Botão de Tema com Ícones --- */
.theme-btn {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 500;
  transition: all 0.3s ease;
}

.theme-btn:hover {
  transform: translateY(-2px);
}

/*  --- Estilos do Menu Hambúrguer --- */
.hamburger-button {
  display: none; 
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  width: 30px;
  height: 24px;
  position: relative;
  z-index: 1001; 
}

.hamburger-line {
  background-color: var(--text-color);
  border-radius: 3px;
  display: block;
  height: 3px;
  width: 100%;
  position: absolute;
  left: 0;
  transition: all 0.3s ease-in-out;
}

.hamburger-line:nth-child(1) {
  top: 0;
}
.hamburger-line:nth-child(2) {
  top: 50%;
  transform: translateY(-50%);
}
.hamburger-line:nth-child(3) {
  bottom: 0;
}

/* --- Animação do botão para "X" quando ativo --- */
.hamburger-button.is-active .hamburger-line:nth-child(1) {
  transform: translateY(10px) rotate(45deg);
}
.hamburger-button.is-active .hamburger-line:nth-child(2) {
  opacity: 0;
}
.hamburger-button.is-active .hamburger-line:nth-child(3) {
  transform: translateY(-11px) rotate(-45deg);
}

/* --- Conteúdo Principal --- */
.main-content {
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

/* --- Seção Hero (Página Inicial) --- */
.hero-section {
  text-align: center;
  padding: 1rem 1.5rem;
}

.hero-text h2 {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.hero-text p {
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

.image {
  max-width: 350px;
  width: 100%;
  height: auto;
  border-radius: 16px;
  margin: 2rem auto;
  display: block;
  padding: 6px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.image:hover {
  transform: scale(1.05);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}


.cta-button {
  background-color: var(--accent-color);
  color: #fff;
  padding: 0.8rem 2.5rem;
  text-decoration: none;
  border-radius: 50px;
  font-weight: 700;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 10px rgba(52, 211, 153, 0.4);
}

.cta-button:hover {
  transform: scale(1.05) translateY(-2px);
  box-shadow: 0 6px 15px rgba(52, 211, 153, 0.5);
}

/*  --- Página de Curso --- */
.course-content h2 {
  text-align: center;
  margin-bottom: 2rem;
  color: var(--primary-color);
}

.course-step {
  background: var(--card-background);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--card-shadow);
  margin-top: 20px;
}

.navigation-buttons {
  text-align: center;
  margin-top: 4rem;
}

/*  --- Página de Exercícios --- */
.exercises-section h2 {
  text-align: center;
  margin-bottom: 2rem;
  color: var(--primary-color);
}

.exercise-form {
  background: var(--card-background);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 2.5rem;
  box-shadow: var(--card-shadow);
  transition: transform 0.2s, box-shadow 0.2s;
  margin-top: 20px;
}
.exercise-form:hover {
  transform: translateY(-5px);
  box-shadow: var(--card-hover-shadow);
}

.exercise-form fieldset {
  border: none;
}

.exercise-form legend {
  font-weight: 600;
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
  width: 100%;
}

.options {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.options label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.8rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
}
.options label:hover {
  border-color: var(--primary-color);
}
[dark-theme="dark"] .options label:hover {
  background-color: rgba(52, 211, 153, 0.1);
}

.options input {
  margin-right: 0.5rem;
  accent-color: var(--primary-color);
}

.combobox {
  width: 100%;
  padding: 0.7rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
  background-color: var(--background-color);
  color: var(--text-color);
}

.exercise-form button {
  background-color: var(--primary-color);
  color: #fff;
  padding: 0.7rem 1.5rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  transition: opacity 0.2s, transform 0.2s;
}
.exercise-form button:hover:not(:disabled) {
  opacity: 0.9;
  transform: translateY(-2px);
}
.exercise-form button:disabled {
  background-color: #9ca3af;
  cursor: not-allowed;
}

.feedback {
  margin-top: 1rem;
  font-weight: 600;
}
.feedback.correct {
  color: #10b981;
}
.feedback.incorrect {
  color: #ef4444;
}

.attempts {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: var(--secondary-text-color);
}

.final-score {
  text-align: center;
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 2rem;
  padding: 1rem;
  background-color: var(--accent-color);
  color: #fff;
  border-radius: 8px;
  display: none;
}

/*  --- Rodapé --- */
.main-footer {
  text-align: center;
  padding: 2rem 1.5rem;
  margin-top: 2rem;
  color: var(--secondary-text-color);
}

/* --- Responsividade --- */

@media (max-width: 768px) {
  /* Mostra o botão hambúrguer e esconde o menu de desktop */
  .hamburger-button {
    display: block;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%; 
    width: 70%;
    max-width: 300px;
    height: 100vh;
    padding-top: 6rem;
    background-color: var(--card-background);
    box-shadow: -4px 0 15px rgba(0, 0, 0, 0.1);
    transition: right 0.4s cubic-bezier(0.23, 1, 0.32, 1);
    display: block;
  }

  .nav-menu.is-active {
    right: 0; /* Menu entra na tela */
  }

  .nav-links {
    flex-direction: column; 
    align-items: center;
    gap: 2.5rem;
  }

  .nav-links a {
    font-size: 1.2rem;
  }

  .hero-text h2 {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .main-nav {
    flex-wrap: nowrap;
  }

  .hero-text h2 {
    font-size: 1.8rem;
  }
  .cta-button {
    padding: 0.7rem 1.5rem;
    font-size: 0.9rem;
  }
  .exercise-form {
    padding: 1.5rem;
  }
  
}