:root {
  --background-color: #201d1a;
  --text-primary: #d4c09d;
  --text-secondary: #9c8b73;
  --accent-color: #e67e22;
  --panel-background: #2b2723;
  --border-color: #3b3530;
}

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

body {
  background-color: var(--background-color);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  padding: 1rem;
  max-width: 800px;
  margin: 0 auto;
}

header {
  text-align: center;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1rem;
}

header h1 {
  font-size: 1.5rem;
  color: var(--text-primary);
}

header p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

nav ul {
  list-style: none;
  display: flex;
  flex-direction: column; 
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

@media (min-width: 600px) {
  nav ul {
    flex-direction: row; 
    justify-content: center;
  }
}

nav a {
  display: block;
  text-align: center;
  padding: 0.75rem;
  background-color: var(--panel-background);
  color: var(--text-primary);
  text-decoration: none;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  transition: background-color 0.2s;
}

nav a:hover, nav a:focus {
  background-color: var(--border-color);
}


main h2 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  text-align: center;
}

main p {
  font-size: 1rem;
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}

.responsive-img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto 1.5rem auto;
  border-radius: 8px;
}

#notifications, #sleep-tips {
  padding: 1rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background-color: var(--panel-background);
  margin-bottom: 1rem;
}

#sleep-tips {
  background-color: #2b2d31;
}

form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

form div {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

label {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

input {
  padding: 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background-color: #201d1a;
  color: var(--text-primary);
}
button {
  padding: 0.75rem;
  border-radius: 8px;
  border: none;
  background-color: var(--accent-color);
  color: white;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.2s;
}
button:hover {
  background-color: #d35400;
}
.table-container {
  overflow-x: auto;
  margin-bottom: 1.5rem;
}
table {
  width: 100%;
  border-collapse: collapse;
  min-width: 400px;
}
table, th, td {
  border: 1px solid var(--border-color);
}

th, td {
  padding: 0.75rem;
  text-align: left;
}

th {
  background-color: var(--panel-background);
}
footer {
  text-align: center;
  padding: 1rem 0;
  border-top: 1px solid var(--border-color);
  margin-top: 1.5rem;
}
footer a {
  color: var(--accent-color);
}