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

body{
  font-family: Arial, sans-serif;
  background: #f4f4f4;
  color: #222;
}

header, .header{
  background: #111;
  color: #fff;
  padding: 18px 16px;
  text-align: center;
}

header h1, .header h1{
  font-size: 2rem;
  margin-bottom: 8px;
  font-weight: 800;
}

nav{
  display: flex;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
}

nav a{
  color: #4da3ff;
  text-decoration: none;
  font-weight: 700;
  padding: 6px 10px;
  border-radius: 8px;
}

nav a:hover{
  background: rgba(77,163,255,0.12);
}

main{
  padding: 30px 16px;
}

.container{
  max-width: 1050px;
  margin: 0 auto;
  padding: 0 16px;
}

.wrap, .main-container, .section-container, .form-container{
  max-width: 1050px;
  margin: 0 auto;
}

.card,
.text-container,
.list-container,
.table-container,
.form,
.main-container,
.section-container{
  background: #fff;
  border-radius: 14px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.08);
}

.main-container{
  padding: 28px;
  gap: 24px;
}

.content, .text-container{
  padding: 28px;
}

h2{
  font-size: 1.6rem;
  margin-bottom: 12px;
}

h3{
  font-size: 1.15rem;
  margin-top: 18px;
  margin-bottom: 10px;
}

p{
  line-height: 1.7;
  margin-bottom: 12px;
  max-width: 78ch;
}

img{
  max-width: 100%;
  height: auto;
  display: block;
}

.img-container{
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 28px;
}

.img-container img{
  width: 280px;
  border-radius: 12px;
}

.latex-container, .links{
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.latex-container a, .links a{
  display: inline-block;
  padding: 10px 14px;
  border-radius: 10px;
  background: #f0f6ff;
  color: #0b5dbb;
  font-weight: 800;
  text-decoration: none;
  border: 1px solid rgba(11,93,187,0.25);
}

.latex-container a:hover, .links a:hover{
  background: #e3efff;
}

ul, ol{
  margin: 10px 0 14px 22px;
  line-height: 1.7;
}

li{
  margin-bottom: 6px;
}

.section-container{
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.list-container, .table-container{
  padding: 18px 18px 8px 18px;
  border-radius: 12px;
  background: #fff;
}

table, #table, #tabela{
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
  margin-bottom: 6px;
  font-size: 0.98rem;
}

th, td, #table th, #table td, #tabela th, #tabela td{
  border: 1px solid rgba(0,0,0,0.18);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

th, #table th, #tabela th{
  background: #f3f3f3;
  font-weight: 800;
}

.form-container{
  background: transparent;
  box-shadow: none;
  border-radius: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}

.form-container h2{
  font-size: 1.6rem;
  font-weight: 800;
}

.form{
  padding: 28px;
  width: 100%;
  max-width: 720px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.label{
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-weight: 700;
}

.field{
  border: 1px solid rgba(0,0,0,0.18);
  border-radius: 10px;
  padding: 10px 12px;
  background: #fff;
  font-size: 1rem;
}

.message{
  resize: none;
  min-height: 170px;
}

.submitBtn{
  width: 100%;
  background: #111;
  color: #fff;
  border: none;
  padding: 12px 14px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 800;
}

.submitBtn:hover{
  opacity: 0.92;
}

@media (min-width: 900px){
  .main-container{
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
  }

  .text-container{
    padding: 0;
    background: transparent;
    box-shadow: none;
  }

  .content{
    padding: 0;
  }
}

@media (max-width: 899px){
  .main-container{
    flex-direction: column;
    align-items: center;
  }

  .img-container{
    padding: 18px 18px 0 18px;
  }

  .text-container{
    padding: 18px;
  }
}