:root {
  --pink-primary: hsl(330, 80%, 65%);
  --pink-secondary: hsl(330, 70%, 85%);
  --pink-gradient: linear-gradient(135deg, hsl(330, 80%, 75%), hsl(340, 85%, 85%));
  
  --blue-primary: hsl(210, 80%, 60%);
  --blue-secondary: hsl(210, 70%, 85%);
  --blue-gradient: linear-gradient(135deg, hsl(210, 80%, 70%), hsl(220, 85%, 85%));
  
  --gray-primary: hsl(220, 10%, 50%);
  --gray-secondary: hsl(220, 10%, 85%);
  --gray-gradient: linear-gradient(135deg, hsl(220, 10%, 70%), hsl(220, 10%, 90%));
  
  --white: #ffffff;
  --text-dark: hsl(220, 20%, 20%);
  --text-light: hsl(220, 10%, 40%);
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.15);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Theme backgrounds */
body.theme-pink {
  background: var(--pink-gradient);
}

body.theme-blue {
  background: var(--blue-gradient);
}

body.theme-gray {
  background: var(--gray-gradient);
}

/* Container */
.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 20px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  text-align: center;
  margin-bottom: 30px;
  padding: 20px 0;
}

.header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 5px;
  color: var(--white);
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header .subtitle {
  font-size: 1rem;
  color: var(--white);
  opacity: 0.9;
}

/* Card */
.card {
  background: var(--white);
  border-radius: 20px;
  padding: 30px;
  box-shadow: var(--shadow-lg);
  margin-bottom: 20px;
  animation: slideUp 0.4s ease-out;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Form elements */
.form-group {
  margin-bottom: 25px;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-dark);
  font-size: 0.95rem;
}

.slider-container {
  position: relative;
  padding: 10px 0;
}

.slider {
  width: 100%;
  height: 8px;
  border-radius: 10px;
  outline: none;
  -webkit-appearance: none;
  background: linear-gradient(to right, hsl(0, 70%, 60%), hsl(60, 70%, 60%), hsl(120, 70%, 60%));
  cursor: pointer;
  transition: opacity 0.2s;
}

.slider:hover {
  opacity: 0.9;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--white);
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  transition: transform 0.2s;
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

.slider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--white);
  cursor: pointer;
  border: none;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  transition: transform 0.2s;
}

.slider::-moz-range-thumb:hover {
  transform: scale(1.1);
}

.slider-value {
  display: inline-block;
  min-width: 30px;
  text-align: center;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-dark);
  margin-left: 10px;
}

.slider-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 5px;
  font-size: 0.85rem;
  color: var(--text-light);
}

/* Textarea */
textarea {
  width: 100%;
  padding: 12px;
  border: 2px solid hsl(220, 10%, 90%);
  border-radius: 10px;
  font-family: inherit;
  font-size: 0.95rem;
  resize: vertical;
  min-height: 80px;
  transition: border-color 0.3s;
}

textarea:focus {
  outline: none;
  border-color: var(--blue-primary);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 14px 30px;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  box-shadow: var(--shadow);
  text-align: center;
  width: 100%;
}

.btn-primary {
  background: linear-gradient(135deg, hsl(210, 80%, 60%), hsl(220, 85%, 70%));
  color: var(--white);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.btn-secondary {
  background: hsl(220, 10%, 95%);
  color: var(--text-dark);
}

.btn-secondary:hover {
  background: hsl(220, 10%, 90%);
}

.btn-danger {
  background: linear-gradient(135deg, hsl(0, 70%, 60%), hsl(10, 75%, 65%));
  color: var(--white);
}

.btn-danger:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(5px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.3s;
}

.modal.active {
  display: flex;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-content {
  background: var(--white);
  border-radius: 20px;
  padding: 40px;
  max-width: 400px;
  width: 90%;
  box-shadow: var(--shadow-lg);
  animation: modalSlideUp 0.3s ease-out;
}

@keyframes modalSlideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-content h2 {
  margin-bottom: 20px;
  color: var(--text-dark);
  font-size: 1.5rem;
}

.modal-content input {
  width: 100%;
  padding: 14px;
  border: 2px solid hsl(220, 10%, 90%);
  border-radius: 10px;
  font-size: 1.1rem;
  margin-bottom: 20px;
  text-align: center;
  letter-spacing: 2px;
  font-weight: 600;
}

.modal-content input:focus {
  outline: none;
  border-color: var(--blue-primary);
}

.modal-buttons {
  display: flex;
  gap: 10px;
}

.modal-buttons .btn {
  flex: 1;
}

/* Alert messages */
.alert {
  padding: 15px 20px;
  border-radius: 10px;
  margin-bottom: 20px;
  font-weight: 500;
  animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.alert-success {
  background: hsl(120, 60%, 95%);
  color: hsl(120, 60%, 30%);
  border: 2px solid hsl(120, 60%, 80%);
}

.alert-error {
  background: hsl(0, 60%, 95%);
  color: hsl(0, 60%, 35%);
  border: 2px solid hsl(0, 60%, 80%);
}

.alert-warning {
  background: hsl(40, 90%, 95%);
  color: hsl(40, 90%, 30%);
  border: 2px solid hsl(40, 90%, 80%);
}

/* Stats grid (for admin) */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 15px;
  margin-bottom: 20px;
}

.stat-card {
  background: linear-gradient(135deg, hsl(220, 10%, 98%), hsl(220, 10%, 95%));
  padding: 20px;
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.stat-card .label {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 5px;
}

.stat-card .value {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-dark);
}

/* Date picker styling */
input[type="date"] {
  padding: 12px;
  border: 2px solid hsl(220, 10%, 90%);
  border-radius: 10px;
  font-size: 0.95rem;
  font-family: inherit;
  width: 100%;
  transition: border-color 0.3s;
}

input[type="date"]:focus {
  outline: none;
  border-color: var(--blue-primary);
}

/* Loading spinner */
.spinner {
  border: 3px solid hsl(220, 10%, 90%);
  border-top: 3px solid var(--blue-primary);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 20px auto;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 600px) {
  .container {
    padding: 15px;
  }
  
  .card {
    padding: 20px;
  }
  
  .header h1 {
    font-size: 1.6rem;
  }
  
  .modal-content {
    padding: 30px 20px;
  }
}