/* ---------- THEME VARIABLES ---------- */
:root {
  --bg: #121212;
  --card: #1e1e1e;
  --text: #e0e0e0;
  --accent: #90caf9;
  --button-text: #121212;
  --border: #555;
}

body.light {
  --bg: #f5f5f5;
  --card: #ffffff;
  --text: #121212;
  --accent: #1976d2;
  --button-text: #ffffff;
  --border: #ccc;
}

/* ---------- BASE ---------- */
body {
  background: var(--bg);
  color: var(--text);
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 20px;
  transition: all 0.3s ease;
}

/* ---------- THEME TOGGLE ---------- */
.theme-toggle {
  position: fixed;
  top: 15px;
  right: 20px;
  font-size: 22px;
  cursor: pointer;
  background: var(--card);
  padding: 8px 10px;
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

/* ---------- CONTAINER ---------- */
.container {
  max-width: 800px;
  margin: auto;
  background: var(--card);
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
}

h1, h2, h3 {
  color: var(--accent);
}

/* ---------- INPUTS ---------- */
.input-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

input, select, button {
  padding: 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background-color: var(--card);
  color: var(--text);
  font-weight: 600;
}

/* ---------- SELECT (GRADE DROPDOWN FIX) ---------- */
select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;

  padding-right: 40px;
  cursor: pointer;

  background-image:
    linear-gradient(45deg, transparent 50%, var(--text) 50%),
    linear-gradient(135deg, var(--text) 50%, transparent 50%);
  background-position:
    calc(100% - 20px) calc(50% - 3px),
    calc(100% - 15px) calc(50% - 3px);
  background-size: 6px 6px;
  background-repeat: no-repeat;
}

/* Focus & hover visibility */
select:hover,
select:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 2px rgba(144, 202, 249, 0.35);
}

/* Dropdown options (BLACK & WHITE CLEAR) */
select option {
  background-color: #ffffff;
  color: #000000;
  font-weight: 600;
}

/* Dark mode dropdown options */
body:not(.light) select option {
  background-color: #1e1e1e;
  color: #ffffff;
}

/* ---------- BUTTON ---------- */
button {
  background: var(--accent);
  color: var(--button-text);
  border: none;
  cursor: pointer;
}

button:hover {
  opacity: 0.85;
}

/* ---------- TABLE ---------- */
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
}

th, td {
  border: 1px solid var(--border);
  padding: 10px;
  text-align: center;
}

th {
  background: var(--accent);
  color: var(--button-text);
}

hr {
  margin: 25px 0;
  border: 1px solid var(--border);
}

/* ---------- FOOTER ---------- */
footer {
  margin-top: 40px;
  padding: 15px;
  text-align: center;
  background: var(--card);
  color: var(--text);
  border-radius: 10px;
  font-weight: 600;
  letter-spacing: 0.5px;

  animation: floatFade 3s ease-in-out infinite;
}

/* Accent glow on name */
footer span {
  color: var(--accent);
  text-shadow: 0 0 8px rgba(144, 202, 249, 0.6);
}

/* Animation */
@keyframes floatFade {
  0% {
    transform: translateY(6px);
    opacity: 0.6;
  }
  50% {
    transform: translateY(0);
    opacity: 1;
  }
  100% {
    transform: translateY(6px);
    opacity: 0.6;
  }
}