:root {
  --bg-color: #fff0f5; /* Light pinkish bg */
  --container-bg: #ffffff;
  --text-primary: #4a4a4a;
  --text-secondary: #7a7a7a;
  --accent-color: #ff9ff3; /* Pink accent */
  --accent-hover: #f368e0;
  --input-bg: #f9f9f9;
  --input-border: #e0e0e0;
  --shadow-color: rgba(0, 0, 0, 0.08);
  --transition-speed: 0.3s;
}

[data-theme="dark"] {
  --bg-color: #2d3436;
  --container-bg: #353b48;
  --text-primary: #dfe6e9;
  --text-secondary: #b2bec3;
  --accent-color: #fd79a8;
  --accent-hover: #e84393;
  --input-bg: #2d3436;
  --input-border: #57606f;
  --shadow-color: rgba(0, 0, 0, 0.4);
}

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

body {
  font-family: 'Noto Sans KR', 'Poppins', sans-serif;
  background: linear-gradient(135deg, var(--bg-color) 0%, #ffeaa7 100%);
  color: var(--text-primary);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  transition: color var(--transition-speed);
  padding: 20px 0;
  overflow-x: hidden; /* Prevent horizontal scroll from animations */
}

/* Background Animation Container */
#bg-animation {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
  pointer-events: none; /* Let clicks pass through */
}

.bg-icon {
  position: absolute;
  font-size: 2rem;
  opacity: 0.6;
  user-select: none;
  animation: float 6s ease-in-out infinite;
  transition: transform 0.1s ease-out; /* For smooth mouse parallax */
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(5deg); }
}

[data-theme="dark"] .bg-icon {
  opacity: 0.3; /* Dimmer icons in dark mode */
}

.container {
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 2.5rem 2.5rem;
  border-radius: 24px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  width: 95%;
  max-width: 500px;
  transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
}

[data-theme="dark"] .container {
  background-color: rgba(53, 59, 72, 0.85);
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

header h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: var(--accent-color);
  font-weight: 700;
}

header p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}

.current-date-time {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.4rem 0.8rem;
  background-color: var(--input-bg);
  border-radius: 8px;
  display: inline-block;
  border: 1px solid var(--input-border);
}

/* Form Styling */
.form-wrapper {
  width: 100%;
}

.form-group {
  margin-bottom: 1.2rem;
  text-align: left;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.8rem 1rem;
  border-radius: 12px;
  border: 1px solid var(--input-border);
  background-color: var(--input-bg);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(255, 159, 243, 0.2);
}

.form-group.row {
  display: flex;
  gap: 15px;
}

.form-group .col {
  flex: 1;
}

textarea {
  resize: vertical;
}

/* Button */
.controls {
  margin-top: 2rem;
  text-align: center;
}

.btn {
  border: none;
  padding: 14px 40px;
  border-radius: 50px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: transform 0.2s, background-color 0.2s, box-shadow 0.2s;
  font-family: inherit;
  width: 100%;
  justify-content: center;
}

.btn.primary {
  background-color: var(--accent-color);
  color: #ffffff;
}
[data-theme="dark"] .btn.primary {
  color: #2d3436;
}


.btn.primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(253, 121, 168, 0.4);
}

.btn:active {
  transform: translateY(0);
}

.btn:disabled {
  background-color: #b2bec3;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* Status Message */
.status-message {
  margin-top: 1rem;
  font-size: 0.9rem;
  text-align: center;
  min-height: 1.5em;
}
.status-message.success { color: #00b894; }
.status-message.error { color: #d63031; }

/* Toggle Switch */
.theme-switch-wrapper {
  position: absolute;
  top: 20px;
  right: 20px;
  display: flex;
  align-items: center;
}

.theme-switch {
  display: inline-block;
  height: 34px;
  position: relative;
  width: 60px;
}

.theme-switch input {
  display: none;
}

.slider {
  background-color: #dfe6e9;
  bottom: 0;
  cursor: pointer;
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
  transition: .4s;
  border-radius: 34px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 5px;
}

.slider:before {
  background-color: #fff;
  bottom: 4px;
  content: "";
  height: 26px;
  left: 4px;
  position: absolute;
  transition: .4s;
  width: 26px;
  border-radius: 50%;
  z-index: 2;
  box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

input:checked + .slider {
  background-color: var(--accent-color);
}

input:checked + .slider:before {
  transform: translateX(26px);
}

.slider .material-icons-round {
  font-size: 20px;
  z-index: 1;
}

.sun { color: #f39c12; }
.moon { color: #f1c40f; }

@media (max-width: 480px) {
  .container {
    padding: 1.5rem;
    width: 100%;
    border-radius: 0;
    box-shadow: none;
    min-height: 100vh;
  }
  .form-group.row {
    flex-direction: column;
    gap: 1.2rem;
  }
}