@import url('https://fonts.googleapis.com/css2?family=Kanit:wght@300;400;500;600;700&display=swap');
:root {
  --primary-color: #004e92;
  --gradient-start: #004e92;
  --gradient-end: #00b4db;
  --header-bg: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
  --card-bg: #ffffff;
  --input-bg: #ffffff;
  --input-border: #ced4da;
  --input-icon-bg: #f8f9fa;
  --text-color: #333;
  --text-muted: #6c757d;
  --math-bg: #ffffff;
  --math-text: #004e92;
}
[data-theme="dark"] {
  --header-bg: linear-gradient(135deg, #0f172a 0%, #1e40af 100%);
  --card-bg: #1e1e1e;
  --input-bg: #2a2a2a;
  --input-border: #555;
  --input-icon-bg: #333;
  --text-color: #e0e0e0;
  --text-muted: #a0a0a0;
  --math-bg: #333;
  --math-text: #60cfff;
}
body {
  font-family: 'Kanit', sans-serif !important;
  background-color: var(--bg-color, #f5f5f5);
  color: var(--text-color);
  margin: 0;
  padding: 0;
}
[data-theme="dark"] body {
  background-color: #121212;
}
.main-content-fix {
  padding-top: 5rem;
}
.board-header {
  position: relative;
  height: 250px;
  width: 100%;
  color: white;
  background: var(--header-bg);
  background-image: radial-gradient(rgba(255, 255, 255, 0.1) 1px, transparent 1px), var(--header-bg);
  background-size: 20px 20px, 100% 100%;
  padding-bottom: 3rem;
}
.board-title {
  font-size: 2.5rem;
  font-weight: 700;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  margin-bottom: 0.5rem;
}
.board-subtitle {
  font-size: 1.1rem;
  font-weight: 300;
  opacity: 0.9;
}
.mt-n5 {
  margin-top: -3rem !important;
}
.form-card {
  background-color: var(--card-bg);
  border-radius: 15px;
  overflow: hidden;
  border: 1px solid transparent;
}
[data-theme="dark"] .form-card {
  border-color: #333;
}
.card-title {
  color: var(--primary-color);
  font-size: 1.5rem;
}
[data-theme="dark"] .card-title {
  color: #60cfff;
}
.form-label {
  font-weight: 500;
  color: var(--text-color);
}
[data-theme="dark"] .form-label {
  color: #e0e0e0;
}
.form-control {
  background-color: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-color);
  border-radius: 8px;
  padding: 0.7rem 1rem;
  font-family: 'Kanit', sans-serif;
  transition: all 0.3s ease;
}
.form-control:focus {
  background-color: var(--input-bg);
  color: var(--text-color);
  border-color: var(--gradient-end);
  box-shadow: 0 0 0 0.25rem rgba(0, 180, 219, 0.15);
}
.input-group-text {
  background-color: var(--input-icon-bg);
  border: 1px solid var(--input-border);
  color: var(--text-muted);
  border-top-left-radius: 8px;
  border-bottom-left-radius: 8px;
  transition: all 0.3s ease;
}
.input-group:focus-within .input-group-text {
  border-color: var(--gradient-end);
  background-color: #e0f7fa;
  color: var(--primary-color);
}
[data-theme="dark"] .input-group:focus-within .input-group-text {
  background-color: #004e92;
  color: #fff;
}
.math-question {
  font-size: 1.2rem;
  color: var(--math-text);
  background-color: var(--math-bg);
  border: 1px solid var(--input-border) !important;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  display: inline-block;
}
[data-theme="dark"] .bg-light {
  background-color: #252525 !important;
  border-color: #444 !important;
}
.trap-field {
  display: none !important;
  visibility: hidden;
  opacity: 0;
  position: absolute;
  left: -9999px;
}
.btn-primary {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  border: none;
  transition: all 0.3s ease;
}
.btn-primary:hover {
  background: linear-gradient(135deg, var(--gradient-end), var(--gradient-start));
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 78, 146, 0.3);
}
[data-theme="dark"] .btn-primary {
  background: linear-gradient(135deg, #003366, #0056b3);
  box-shadow: none;
}
@media (max-width: 768px) {
  .main-content-fix {
    padding-top: 3.8rem;
  }
  .board-header {
    height: 200px;
  }
  .board-title {
    font-size: 2rem;
  }
}
[data-theme="dark"] {
  --header-bg: linear-gradient(135deg, #0f172a 0%, #1e40af 100%);
  --card-bg: #1e1e1e;
  --input-bg: #2a2a2a;
  --input-border: #444;
  --input-text: #e0e0e0;
  --math-bg: #333;
  --math-text: #60cfff;
}