:root[data-theme="dark"] {
  --bg-color: #121212;
  --text-color: #fff;
  --card-bg: #1f1f1f;
  --form-bg: #2c2c2c;
  --border-color: #444;
  --placeholder-color: #bbb;
  --link-color: #0dcaf0;
}

:root[data-theme="light"] {
  --bg-color: #f8f9fa;
  --text-color: #212529;
  --card-bg: #fff;
  --form-bg: #fff;
  --border-color: #ced4da;
  --placeholder-color: #6c757d;
  --link-color: #0d6efd;
}

/* Apply theme variables */
body,
h1, h2, h3, h4, h5, h6,
p, span, label, div,
a, li, td, th, small {
  color: var(--text-color);
}

body {
  background-color: var(--bg-color);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  padding-top: 70px;
}

.card {
  background-color: var(--card-bg);
  border: none;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.form-control, .form-select {
  background-color: var(--form-bg);
  color: var(--text-color);
  border: 1px solid var(--border-color);
}

.form-control::placeholder {
  color: var(--placeholder-color);
}

.form-control:focus, .form-select:focus {
  background-color: var(--form-bg);
  color: var(--text-color);
  border-color: #00c9ff;
  box-shadow: none;
}

.btn-primary {
  background: linear-gradient(45deg, #00C9FF, #92FE9D);
  border: none;
  color: #000;
  font-weight: 600;
}

.btn-primary:hover {
  opacity: 0.9;
}

.fixed-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 60px;
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  padding: 0 15px;
  z-index: 1030;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.back-arrow {
  font-size: 1.8rem;
  margin-right: 15px;
  color: var(--link-color);
  text-decoration: none;
}

.username-display {
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--link-color);
  max-width: 200px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.search-box {
  margin-left: auto;
  max-width: 220px;
  position: relative;
}

.search-box input {
  border-radius: 20px;
  border: 1px solid var(--border-color);
  padding: 6px 30px 6px 12px;
  height: 36px;
  background-color: var(--form-bg);
  color: var(--text-color);
  font-size: 14px;
}

.search-box i {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--placeholder-color);
}

.alert-message {
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 12px;
}

.form-actions {
  text-align: right;
}