:root {
  /* Color Palette - Modern & Clean Light Theme */
  --primary: #4F46E5;
  --primary-dark: #4338CA;
  --primary-light: #6366F1;
  --secondary: #10B981;
  --secondary-light: #34D399;
  --accent: #F59E0B;
  --background: #F8FAFC;
  --surface: #FFFFFF;
  --surface-light: #F1F5F9;
  --text: #1E293B;
  --text-muted: #64748B;
  --error: #EF4444;
  --success: #22C55E;
  --warning: #F59E0B;

  /* Glassmorphism Light */
  --glass-bg: rgba(255, 255, 255, 0.8);
  --glass-border: rgba(0, 0, 0, 0.05);

  /* Typography */
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Shadows - Softer for Light Mode */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 44px 6px -2px rgba(0, 0, 0, 0.02);
  --shadow-glow: 0 0 20px rgba(79, 70, 229, 0.1);

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Reset & Base */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background: var(--background);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Background Pattern - Softer Gradient */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(circle at 10% 10%, rgba(79, 70, 229, 0.03) 0%, transparent 40%),
    radial-gradient(circle at 90% 90%, rgba(16, 185, 129, 0.03) 0%, transparent 40%);
  pointer-events: none;
  z-index: -1;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 600;
  line-height: 1.3;
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.5rem;
}

h3 {
  font-size: 1.25rem;
}

/* Links */
a {
  color: var(--primary-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--primary);
}

/* Container */
.container {
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
  padding: var(--spacing-md);
}

/* Cards / Glass Panels */
.card {
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: var(--spacing-xs);
}

.form-input {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
  transition: all var(--transition-fast);
}

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

.form-input::placeholder {
  color: var(--text-muted);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  box-shadow: var(--shadow-sm), 0 0 20px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md), 0 0 30px rgba(79, 70, 229, 0.4);
}

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

.btn-secondary {
  background: var(--surface-light);
  color: var(--text);
}

.btn-secondary:hover {
  background: var(--surface);
}

.btn-success {
  background: linear-gradient(135deg, var(--secondary) 0%, #059669 100%);
  color: white;
}

.btn-success:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md), 0 0 30px rgba(16, 185, 129, 0.3);
}

.btn-cancel {
  background: linear-gradient(135deg, var(--error) 0%, #DC2626 100%);
  color: white;
}

.btn-cancel:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md), 0 0 30px rgba(239, 68, 68, 0.3);
}

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.875rem;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* Alerts / Messages */
.alert {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  animation: slideIn 0.3s ease;
}

.alert-error {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #FCA5A5;
}

.alert-success {
  background: rgba(34, 197, 94, 0.15);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: #86EFAC;
}

/* Auth Pages */
.auth-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
}

.auth-logo {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.auth-logo-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-md);
  font-size: 2.5rem;
  box-shadow: var(--shadow-glow);
}

.auth-logo h1 {
  font-size: 1.5rem;
  background: linear-gradient(135deg, var(--text) 0%, var(--text-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.auth-logo p {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.auth-card {
  width: 100%;
  max-width: 400px;
}

.auth-footer {
  text-align: center;
  margin-top: var(--spacing-lg);
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* App Layout */
.app-layout {
  min-height: 100vh;
  padding-bottom: 80px;
}

.app-header {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  padding: var(--spacing-md);
  position: sticky;
  top: 0;
  z-index: 100;
}

.app-header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 480px;
  margin: 0 auto;
}

.app-header h1 {
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.app-header h1 span {
  font-size: 1.5rem;
}

.user-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  color: white;
}

/* Bottom Navigation */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--glass-border);
  padding: var(--spacing-sm) var(--spacing-md);
  padding-bottom: max(var(--spacing-sm), env(safe-area-inset-bottom));
  z-index: 100;
}

.bottom-nav-content {
  max-width: 480px;
  margin: 0 auto;
  display: flex;
  justify-content: space-around;
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.75rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
  background: none;
  border: none;
  font-family: inherit;
}

.nav-item:hover,
.nav-item.active {
  color: var(--primary-light);
  background: rgba(79, 70, 229, 0.1);
}

.nav-item-icon {
  width: 24px;
  height: 24px;
  margin-bottom: 4px;
}

.nav-item.active .nav-item-icon {
  stroke: var(--primary);
}

/* Date Selector */
.date-selector {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: var(--glass-bg);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
}

.date-nav-btn {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--surface);
  border: 1px solid var(--glass-border);
  color: var(--text);
  font-size: 1.25rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.date-nav-btn:hover {
  background: var(--surface-light);
  transform: scale(1.05);
}

.date-display {
  text-align: center;
  min-width: 200px;
}

.date-display-day {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

.date-display-full {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Time Slots Grid */
.time-slots {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.time-slot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

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

.time-slot-time {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text);
}

.time-slot-status {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.time-slot.available {
  border-left: 4px solid var(--secondary);
}

.time-slot.occupied {
  border-left: 4px solid var(--error);
  opacity: 0.8;
}

.time-slot.my-reservation {
  border-left: 4px solid var(--primary);
  background: rgba(79, 70, 229, 0.1);
}

.occupant-name {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.status-badge {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.status-badge.free {
  background: rgba(16, 185, 129, 0.2);
  color: var(--secondary-light);
}

.status-badge.occupied {
  background: rgba(239, 68, 68, 0.2);
  color: #FCA5A5;
}

.status-badge.mine {
  background: rgba(79, 70, 229, 0.2);
  color: var(--primary-light);
}

/* History List */
.history-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.history-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.history-item:hover {
  transform: translateX(4px);
}

.history-date-badge {
  min-width: 60px;
  padding: var(--spacing-sm);
  background: var(--surface);
  border-radius: var(--radius-md);
  text-align: center;
}

.history-date-badge-day {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
}

.history-date-badge-month {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.history-details {
  flex: 1;
}

.history-time {
  font-weight: 600;
  color: var(--text);
}

.history-name {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.history-status {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.history-status.past {
  background: rgba(148, 163, 184, 0.2);
  color: var(--text-muted);
}

.history-status.upcoming {
  background: rgba(79, 70, 229, 0.2);
  color: var(--primary-light);
}

/* Loading States */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl);
  color: var(--text-muted);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--surface-light);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--text-muted);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

/* Animations */
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

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

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.3s ease;
}

.slide-up {
  animation: slideUp 0.4s ease;
}

/* Page Transitions */
.page {
  display: none;
  animation: fadeIn 0.3s ease;
}

.page.active {
  display: block;
}

/* Utilities */
.text-center {
  text-align: center;
}

.text-muted {
  color: var(--text-muted);
}

.mt-sm {
  margin-top: var(--spacing-sm);
}

.mt-md {
  margin-top: var(--spacing-md);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mb-md {
  margin-bottom: var(--spacing-md);
}

.divider {
  border: none;
  border-top: 1px solid var(--glass-border);
  margin: var(--spacing-lg) 0;
}

.hidden {
  display: none !important;
}

/* Responsive */
@media (max-width: 380px) {
  .container {
    padding: var(--spacing-sm);
  }

  .card {
    padding: var(--spacing-lg);
  }

  .date-display {
    min-width: 150px;
  }
}