* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0a192f;
  color: #ccd6f6;
  min-height: 100vh;

  display: flex;
  align-items: center;
  justify-content: center;

  padding: 24px;
}

.container {
  width: 100%;
  max-width: 480px;
  padding: 32px;
  background: #112240;
  border-radius: 18px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

h1 {
  margin: 0 0 8px;
  font-size: 36px;
  letter-spacing: -1px;
}

p {
  color: #8892b0;
}

label {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  font-weight: bold;
  color: #ccd6f6;
}

input,
select,
button {
  width: 100%;
  margin-bottom: 18px;
  padding: 13px 14px;
  font-size: 16px;
  border-radius: 10px;
}

input,
select {
  border: 1px solid #233554;
  background: #0a192f;
  color: #ccd6f6;
}

input:focus,
select:focus {
  outline: none;
  border-color: #64ffda;
}

button {
  margin-top: 8px;
  border: none;
  background: #64ffda;
  color: #0a192f;
  font-weight: bold;
  cursor: pointer;
  transition: transform 0.15s ease, opacity 0.15s ease;
}

button:hover {
  transform: translateY(-1px);
  opacity: 0.9;
}

.result {
  display: none;
  margin-top: 24px;
  padding: 18px;
  background: #0a192f;
  border: 1px solid #233554;
  border-radius: 14px;
}

.result h2 {
  margin-top: 0;
}

.result p {
  margin: 8px 0;
  color: #ccd6f6;
  font-size: 17px;
}

#paceInputs {
  display: none;
}

@media (max-width: 520px) {
  body {
    align-items: flex-start;
    padding: 16px;
  }

  .container {
    padding: 24px;
  }

  h1 {
    font-size: 30px;
  }
}

.page-nav {
  width: 100%;
  max-width: 480px;
  margin-bottom: 16px;
}

nav a {
  color: #64ffda;
  text-decoration: none;
  font-weight: 600;
}

nav a:hover {
  text-decoration: underline;
}

nav span {
  color: #8892b0;
  margin: 0 8px;
}

.page-shell {
  width: 100%;
  max-width: 480px;
}

.page-nav {
  margin-bottom: 16px;
}

.page-nav a {
  color: #64ffda;
  text-decoration: none;
  font-weight: 600;
}

.page-nav a:hover {
  text-decoration: underline;
}

.page-nav span {
  color: #8892b0;
  margin: 0 8px;
}