/* ============================================
   CSS Variables & Design Tokens - Purple Theme
   ============================================ */
:root {
  /* Colors - Purple Theme */
  --primary: #a78bfa;
  --primary-light: #c4b5fd;
  --primary-dark: #8b5cf6;
  --primary-bg: rgba(167, 139, 250, 0.12);
  --primary-border: rgba(167, 139, 250, 0.4);

  --accent: #e879f9;
  --accent-light: #f0abfc;

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --bg-page: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
  --bg-card: #1e293b;
  --bg-card-elevated: #273449;
  --bg-hover: #334155;
  --bg-input: #0f172a;

  --border-light: #334155;
  --border-medium: #475569;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 40px rgba(139, 92, 246, 0.15);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

html,
body,
#root {
  min-height: 100%;
  background-color: #0f172a;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-page);
  background-repeat: no-repeat;
  background-size: cover;
  background-attachment: scroll;
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  min-height: 100dvh;
  position: relative;
  padding: max(var(--space-md), env(safe-area-inset-top)) max(var(--space-md), env(safe-area-inset-right))
    max(var(--space-md), env(safe-area-inset-bottom)) max(var(--space-md), env(safe-area-inset-left));
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: var(--bg-page);
  z-index: -1;
}

/* ============================================
   Container & Layout
   ============================================ */
.container {
  max-width: 1100px;
  margin: 0 auto;
  animation: slideUp 0.4s ease-out;
}

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

/* ============================================
   Header Section
   ============================================ */
header {
  text-align: center;
  margin-bottom: var(--space-xl);
  padding-top: var(--space-lg);
}

.back-link {
  display: inline-block;
  margin-bottom: var(--space-lg);
  color: var(--primary-light);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9375rem;
  transition: all var(--transition-fast);
}

.back-link:hover {
  color: var(--primary);
  transform: translateX(-3px);
}

header h1 {
  font-weight: 700;
  font-size: 2rem;
  letter-spacing: -0.5px;
  margin-bottom: var(--space-sm);
  background: linear-gradient(135deg, var(--text-primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

header p {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* ============================================
   Booking Layout
   ============================================ */
.booking-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  background: var(--bg-card);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
  overflow: hidden;
  border: 1px solid var(--border-light);
}

@media (max-width: 850px) {
  .booking-layout {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   Calendar Section (Left Column)
   ============================================ */
.calendar-section {
  padding: var(--space-xl);
  background: linear-gradient(180deg, var(--primary-bg) 0%, transparent 100%);
  border-right: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

@media (max-width: 850px) {
  .calendar-section {
    border-right: none;
    border-bottom: 1px solid var(--border-light);
  }
}

.calendar-container {
  flex-shrink: 0;
}

.calendar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-lg);
}

.calendar-header h3 {
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--text-primary);
  min-width: 140px;
  text-align: center;
}

.btn-small {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card-elevated);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-weight: 600;
}

.btn-small:hover {
  background: var(--bg-hover);
  color: var(--primary);
  border-color: var(--primary-border);
}

.calendar-grid-header {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  text-align: center;
  font-weight: 600;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-bottom: var(--space-sm);
}

.calendar-grid-days {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: var(--space-xs);
}

.calendar-day-btn {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 2px solid transparent;
  background: transparent;
  color: var(--text-primary);
  position: relative;
  padding: 0;
}

.calendar-day-btn:hover:not(:disabled) {
  background: var(--primary-bg);
  border-color: var(--primary-border);
  color: var(--primary);
}

.calendar-day-btn.selected {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.calendar-day-btn:disabled {
  color: var(--text-muted);
  opacity: 0.4;
  cursor: not-allowed;
}

.calendar-day-btn.today {
  font-weight: 700;
}

.calendar-day-btn.today::after {
  content: '';
  position: absolute;
  bottom: 4px;
  width: 4px;
  height: 4px;
  background: var(--primary);
  border-radius: var(--radius-full);
}

.calendar-day-btn.selected.today::after {
  background: white;
}

/* ============================================
   Time Slots Section
   ============================================ */
.time-slots-section {
  max-height: none;
  overflow: visible;
  scroll-behavior: smooth;
}

.time-slots-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.time-slots-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.time-day-group {
  animation: fadeIn 0.3s ease;
}

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

.time-day-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.time-day-header h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
}

.today-label {
  display: inline-block;
  padding: 2px 8px;
  background: var(--primary);
  color: white;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  border-radius: var(--radius-sm);
}

.time-slots-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(85px, 1fr));
  gap: var(--space-sm);
}

.time-slot {
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-card);
  border: 1.5px solid var(--border-medium);
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: center;
}

.time-slot:hover {
  border-color: var(--primary);
  background: var(--primary-bg);
  color: var(--primary);
  transform: translateY(-1px);
}

.time-slot:active {
  transform: translateY(0);
}

.time-slot.selected {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
  box-shadow: var(--shadow-md);
}

.no-slots-message {
  text-align: center;
  padding: var(--space-xl);
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

/* ============================================
   Booking Form Section
   ============================================ */
.booking-form-container {
  padding: var(--space-xl);
  background: var(--bg-card);
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
  font-size: 0.875rem;
}

.form-group label .required {
  color: var(--accent);
}

.form-control,
input[type="text"],
input[type="email"],
input[type="tel"],
textarea {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  border: 1.5px solid var(--border-medium);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: inherit;
  background: var(--bg-input);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.form-control:focus,
input:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-bg);
}

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

.form-control option {
  background: var(--bg-card);
  color: var(--text-primary);
}

textarea {
  resize: vertical;
  min-height: 80px;
}

.selected-datetime {
  background: var(--primary-bg);
  padding: var(--space-md);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
  font-weight: 600;
  color: var(--primary);
  text-align: center;
  border: 1px solid var(--primary-border);
}

.initial-message {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 300px;
  color: var(--text-secondary);
  font-size: 1rem;
  text-align: center;
  padding: var(--space-xl);
}

.error-message {
  margin-top: var(--space-xs);
  font-size: 0.8125rem;
  color: #ef4444;
}

/* ============================================
   Buttons
   ============================================ */
.btn-primary {
  padding: var(--space-md) var(--space-lg);
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  transition: all var(--transition-fast);
  margin-top: var(--space-sm);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* ============================================
   Success Modal
   ============================================ */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(8px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-slow);
}

.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--bg-card);
  padding: var(--space-2xl);
  border-radius: var(--radius-2xl);
  width: 90%;
  max-width: 420px;
  position: relative;
  transform: scale(0.9);
  transition: all var(--transition-slow);
  text-align: center;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-xl);
}

.modal-overlay.open .modal-content {
  transform: scale(1);
}

.success-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-lg);
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.success-icon svg {
  width: 40px;
  height: 40px;
}

.modal-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.modal-content p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: var(--space-xl);
}

/* ============================================
   Utility Classes
   ============================================ */
.hidden {
  display: none !important;
}

.text-center {
  text-align: center;
}

.mt-4 {
  margin-top: var(--space-lg);
}

.mt-2 {
  margin-top: var(--space-sm);
}

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

.text-success {
  color: #22c55e;
}

.text-danger {
  color: #ef4444;
}

/* ============================================
   Responsive Adjustments
   ============================================ */
@media (max-width: 480px) {
  body {
    padding: max(0px, env(safe-area-inset-top)) max(0px, env(safe-area-inset-right))
      max(0px, env(safe-area-inset-bottom)) max(0px, env(safe-area-inset-left));
  }

  .container {
    border-radius: 0;
    min-height: 100vh;
    min-height: 100dvh;
  }

  header {
    padding: var(--space-lg);
  }

  header h1 {
    font-size: 1.5rem;
  }

  .booking-layout {
    border-radius: 0;
    border: none;
    box-shadow: none;
  }

  .calendar-container,
  .booking-form-container {
    padding: var(--space-lg);
  }

  .calendar-day-btn {
    font-size: 0.8125rem;
  }
}

@media (min-width: 481px) and (max-width: 849px) {
  body {
    padding: var(--space-xl);
  }
}

@media (min-width: 1200px) {
  .container {
    max-width: 1200px;
  }

  .booking-layout {
    grid-template-columns: 440px 1fr;
  }
}