:root {
  --primary-color: #4F46E5;
  --primary-hover: #4338CA;
  --bg-color: #F3F4F6;
  --card-bg: rgba(255, 255, 255, 0.85);
  --text-main: #111827;
  --text-muted: #6B7280;
  
  --success: #10B981;
  --warning: #F59E0B;
  --danger: #EF4444;
  
  --border-radius: 12px;
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.1);
  --glass-border: 1px solid rgba(255, 255, 255, 0.4);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
  background: var(--bg-color);
  background-image: linear-gradient(135deg, #e0e7ff 0%, #f3f4f6 100%);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem 1rem;
}

h1, h2, h3 {
  font-weight: 700;
  color: var(--text-main);
}

.container {
  width: 100%;
  max-width: 800px;
}

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

.header p {
  color: var(--text-muted);
  margin-top: 0.5rem;
}

.card {
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: var(--border-radius);
  border: var(--glass-border);
  box-shadow: var(--glass-shadow);
  padding: 2rem;
  margin-bottom: 2rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.form-group {
  margin-bottom: 1.5rem;
}

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

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid #D1D5DB;
  border-radius: 8px;
  font-size: 1rem;
  transition: all 0.2s;
  background: rgba(255,255,255,0.9);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

.btn {
  display: inline-block;
  background: var(--primary-color);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  width: 100%;
  text-align: center;
}

.btn:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

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

/* Slots Grid */
.slots-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.slot-item {
  background: white;
  border: 2px solid #E5E7EB;
  border-radius: 8px;
  padding: 1rem;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
}

.slot-item:hover {
  border-color: var(--primary-color);
}

.slot-item.selected {
  border-color: var(--primary-color);
  background: #EEF2FF;
}

.slot-item.full {
  opacity: 0.8;
}

.slot-item.full .badge {
  background: var(--warning);
  color: white;
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  background: #E5E7EB;
  color: var(--text-muted);
}

.badge.available {
  background: #D1FAE5;
  color: #065F46;
}

.slot-title {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.slot-time {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

/* Toast Notification */
#toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  padding: 1rem 1.5rem;
  border-radius: 8px;
  background: white;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  animation: slideFadeIn 0.3s ease forwards;
  min-width: 250px;
}

.toast.success { border-left: 4px solid var(--success); }
.toast.error { border-left: 4px solid var(--danger); }

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

/* Loader */
.loader {
  border: 3px solid rgba(0,0,0,0.1);
  border-radius: 50%;
  border-top: 3px solid var(--primary-color);
  width: 24px;
  height: 24px;
  animation: spin 1s linear infinite;
  margin: 0 auto;
}

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