/* ================================
   Variables de Tema
   ================================ */
:root {
  --color-primary: #2C3E50;
  --color-secondary: #18BC9C;
  --color-background: #F5F7FA;
  --color-surface: #FFFFFF;
  --color-text: #34495E;
  --color-muted: #7F8C8D;
  --color-border: #E0E4E8;
  --radius: 6px;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --font-base: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --transition: 0.2s ease-in-out;
}

/* ================================
   Reset e Global
   ================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-base);
  background: var(--color-background);
  color: var(--color-text);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ================================
   Cabeçalho e Navegação
   ================================ */
header {
  background: var(--color-primary);
  color: var(--color-surface);
  padding: var(--spacing-md) var(--spacing-lg);
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

header nav {
  max-width: 1200px;
  margin: 0 auto;
}

header nav ul {
  list-style: none;
  display: flex;
  gap: var(--spacing-md);
}

header nav a {
  color: var(--color-surface);
  text-decoration: none;
  font-weight: 600;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius);
  transition: background var(--transition);
}

header nav a:hover,
header nav a:focus {
  background: rgba(255,255,255,0.1);
  outline: none;
}

/* ================================
   Main Container
   ================================ */
main {
  flex: 1;
  width: 100%;
  max-width: 1000px;
  margin: var(--spacing-lg) auto;
  padding: 0 var(--spacing-md);
}

/* ================================
   Formulário
   ================================ */
form {
  background: var(--color-surface);
  padding: var(--spacing-lg);
  border-radius: var(--radius);
  box-shadow: 0 2px 6px rgba(0,0,0,0.05);
}

form .form-group {
  margin-bottom: var(--spacing-md);
}

form label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
}

form input[type="text"],
form textarea,
form input[type="file"] {
  width: 100%;
  padding: var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 1rem;
  transition: border-color var(--transition);
}

form input[type="text"]:focus,
form textarea:focus,
form input[type="file"]:focus {
  border-color: var(--color-secondary);
  outline: none;
}

form textarea {
  min-height: 120px;
  resize: vertical;
}

form button {
  display: inline-block;
  background: var(--color-secondary);
  color: var(--color-surface);
  border: none;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}

form button:hover,
form button:focus {
  background: #15a286;
  transform: translateY(-2px);
  outline: none;
}

/* ================================
   Mensagens de Status
   ================================ */
.success {
  background: #E8F8F5;
  border-left: 4px solid var(--color-secondary);
  color: var(--color-text);
  padding: var(--spacing-sm) var(--spacing-md);
  margin-bottom: var(--spacing-md);
  border-radius: var(--radius);
  position: relative;
  animation: fadeIn 0.3s ease;
}

/* ================================
   Tabela de Listagem
   ================================ */
table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin-top: var(--spacing-md);
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 6px rgba(0,0,0,0.05);
}

table thead {
  background: var(--color-primary);
}

table th,
table td {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  font-size: 0.95rem;
  color: var(--color-text);
}

table th {
  color: var(--color-surface);
  font-weight: 500;
}

table tbody tr {
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition);
}

table tbody tr:last-child {
  border-bottom: none;
}

table tbody tr:hover {
  background: var(--color-background);
}

table td a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition);
}

table td a:hover {
  color: var(--color-secondary);
}

/* ================================
   Lista de Arquivos
   ================================ */
.file-list {
  list-style: disc inside;
  margin-top: var(--spacing-xs);
  font-size: 0.9rem;
  color: var(--color-muted);
}

/* ================================
   Rodapé
   ================================ */
footer {
  background: var(--color-surface);
  text-align: center;
  padding: var(--spacing-md);
  font-size: 0.9rem;
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
}

/* ================================
   Animações
   ================================ */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-5px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ================================
   Responsividade
   ================================ */
@media (max-width: 768px) {
  header nav ul {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  main {
    padding: 0 var(--spacing-sm);
  }

  table th,
  table td {
    padding: var(--spacing-sm);
    font-size: 0.85rem;
  }

  form button {
    width: 100%;
  }
}