html {
  scroll-behavior: smooth;
}

body {
  background-color: #fff;
  color: #000;
  font-family: 'Montserrat', sans-serif;
  font-size: 16px;
  margin: 0;
  padding: 0;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  border-bottom: 2px solid #000;
}

.site-header__logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: #000;
  text-decoration: none;
  letter-spacing: -0.02em;
}

.site-header__logo:hover {
  color: #000;
}

.site-header__label {
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  background-color: #fff;
  color: #000;
  border: 2px solid #000;
  padding: 0.65rem 1.75rem;
  font-family: 'Montserrat', sans-serif;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease-in-out;
  user-select: none;
}

.btn:hover {
  background-color: #000;
  color: #fff;
}

.section {
  padding: 5rem 2rem;
  max-width: 1000px;
  margin: 0 auto;
}

.section__title {
  font-size: 2rem;
  font-weight: 700;
  margin: 0 0 2.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid #000;
  letter-spacing: -0.02em;
}

.card {
  border: 2px solid #000;
  padding: 1.75rem;
  transition: all 0.3s ease-in-out;
}

.card--hover:hover {
  background-color: #000;
  color: #fff;
}

.card-grid {
  display: grid;
  gap: 1.25rem;
}

.form {
  display: flex;
  flex-direction: column;
  max-width: 600px;
}

.form label {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.4rem;
  margin-top: 1.5rem;
}

.form label:first-child {
  margin-top: 0;
}

.form input,
.form textarea {
  border: none;
  border-bottom: 2px solid #000;
  background: transparent;
  font-family: 'Montserrat', sans-serif;
  font-size: 1rem;
  color: #000;
  padding: 0.4rem 0;
  width: 100%;
  outline: none;
  transition: border-color 0.2s;
  box-sizing: border-box;
}

.form input:focus,
.form textarea:focus {
  border-bottom-color: #000;
}

.form textarea {
  height: 150px;
  resize: none;
}

.mensaje-container {
  display: flex;
  flex-direction: column;
}

#mensaje-count {
  font-size: 0.75rem;
  color: #666;
  margin-top: 0.35rem;
  text-align: right;
}

.form .btn {
  margin-top: 2rem;
  align-self: flex-start;
}

.form .btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.form .btn:disabled:hover {
  background-color: #fff;
  color: #000;
}

.site-footer {
  border-top: 2px solid #000;
  padding: 1.5rem 2rem;
  text-align: center;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}