/**
 * Mobile-First Private Calendar Styles
 * Optimized for mobile devices with progressive enhancement for desktop
 */

/* ============================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================ */
:root {
  /* Colors - Dark Theme (Default) */
  --color-bg-primary: #0f172a;
  --color-bg-secondary: #071126;
  --color-bg-glass: rgba(255, 255, 255, 0.03);
  --color-bg-glass-hover: rgba(255, 255, 255, 0.06);
  --color-text-primary: #e6eef8;
  --color-text-secondary: rgba(230, 238, 248, 0.7);
  --color-text-muted: rgba(230, 238, 248, 0.5);
  
  /* Accent Colors */
  --color-accent-primary: #7c5cff;
  --color-accent-secondary: #2ec1ff;
  --color-success: #1fd1a9;
  --color-danger: #ff6b6b;
  --color-warning: #ffb86b;
  
  /* Borders */
  --border-color: rgba(255, 255, 255, 0.06);
  --border-color-hover: rgba(255, 255, 255, 0.12);
  --border-radius: 8px;
  --border-radius-lg: 12px;
  
  /* Spacing (Mobile-first) */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Typography */
  --font-family-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-family-headings: 'Outfit', 'Inter', system-ui, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(2, 6, 23, 0.3);
  --shadow-md: 0 4px 12px rgba(2, 6, 23, 0.4);
  --shadow-lg: 0 8px 30px rgba(2, 6, 23, 0.6);
  --shadow-xl: 0 10px 30px rgba(2, 6, 23, 0.7);
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Touch targets (Mobile) */
  --touch-target-min: 44px;
  --touch-target-comfortable: 48px;
  
  /* Z-index scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* ============================================
   LIGHT THEME OVERRIDES
   ============================================ */
[data-theme="light"] {
  --color-bg-primary: #f8fafc;
  --color-bg-secondary: #e2e8f0;
  --color-bg-glass: rgba(255, 255, 255, 0.7);
  --color-bg-glass-hover: rgba(255, 255, 255, 0.9);
  --color-text-primary: #0f172a;
  --color-text-secondary: rgba(15, 23, 42, 0.7);
  --color-text-muted: rgba(15, 23, 42, 0.5);
  
  --border-color: rgba(15, 23, 42, 0.08);
  --border-color-hover: rgba(15, 23, 42, 0.15);
  
  --color-accent-primary: #6366f1;
  --color-accent-secondary: #3b82f6;
  
  --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 8px 30px rgba(15, 23, 42, 0.1);
  --shadow-xl: 0 10px 30px rgba(15, 23, 42, 0.15);
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  font-size: 16px; /* Prevent iOS zoom on input focus */
}

body {
  font-family: var(--font-family-body);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
  background-attachment: fixed;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding-bottom: var(--spacing-md);
  transition: background 0.4s ease, color 0.4s ease;
}

/* ============================================
   MOBILE-FIRST LAYOUT
   ============================================ */
.container {
  width: 100%;
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
  margin-left: auto;
  margin-right: auto;
}

/* Mobile: Full width with padding */
@media (min-width: 640px) {
  .container {
    max-width: 640px;
  }
}

/* Tablet */
@media (min-width: 768px) {
  .container {
    max-width: 768px;
    padding-left: var(--spacing-lg);
    padding-right: var(--spacing-lg);
  }
}

/* Desktop */
@media (min-width: 1024px) {
  .container {
    max-width: 1024px;
  }
}

/* Large Desktop */
@media (min-width: 1280px) {
  .container {
    max-width: 1280px;
  }
}

/* ============================================
   GLASS MORPHISM CARDS
   ============================================ */
.card.glass {
  background: var(--color-bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(6px) saturate(120%);
  transition: all var(--transition-base);
}

.card.glass:hover {
  background: var(--color-bg-glass-hover);
  border-color: var(--border-color-hover);
}

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

@media (min-width: 768px) {
  .card-body {
    padding: var(--spacing-xl);
  }
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-headings);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

.page-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.page-title h3 {
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-sm);
}

.page-title .subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* ============================================
   FORMS (MOBILE-OPTIMIZED)
   ============================================ */
.form-field-wrapper {
  position: relative;
  margin-bottom: var(--spacing-lg);
}

.form-field-wrapper label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  letter-spacing: 0.3px;
}

.form-control {
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  color: var(--color-text-primary);
  padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 2.75rem;
  font-size: var(--font-size-base); /* Prevent iOS zoom */
  min-height: var(--touch-target-comfortable); /* Touch-friendly */
  transition: all var(--transition-base);
  -webkit-appearance: none;
  appearance: none;
}

.form-control:focus {
  outline: none;
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(124, 92, 255, 0.5);
  box-shadow: 0 0 0 3px rgba(124, 92, 255, 0.15);
}

.form-control::placeholder {
  color: rgba(230, 238, 248, 0.4);
}

.form-field-icon {
  position: absolute;
  left: 0.875rem;
  top: 2.75rem;
  color: rgba(230, 238, 248, 0.6);
  font-size: 1.1rem;
  pointer-events: none;
  transition: color var(--transition-base);
}

.form-field-wrapper:focus-within .form-field-icon {
  color: rgba(124, 92, 255, 0.8);
}

textarea.form-control {
  min-height: 100px;
  padding-left: var(--spacing-md);
  resize: vertical;
}

/* ============================================
   BUTTONS (MOBILE-OPTIMIZED)
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  font-weight: 600;
  font-size: var(--font-size-base);
  border-radius: var(--border-radius);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  min-height: var(--touch-target-comfortable);
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: linear-gradient(90deg, var(--color-accent-primary), var(--color-accent-secondary));
  color: white;
}

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

.btn-success {
  background: linear-gradient(90deg, var(--color-success), #1bc9ff);
  color: white;
}

.btn-danger {
  background: linear-gradient(90deg, #ff6b6b, #ff8787);
  color: white;
}

.btn-outline-light {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: var(--color-text-primary);
}

.btn-outline-light:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

.d-grid {
  display: grid;
}

.d-grid .btn {
  width: 100%;
}

/* ============================================
   NAVIGATION (MOBILE-FIRST)
   ============================================ */
.navbar {
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(10px);
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
}

.navbar-brand {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
}

.navbar-toggler {
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: var(--spacing-sm) var(--spacing-md);
  background: transparent;
  color: var(--color-text-primary);
  min-height: var(--touch-target-comfortable);
  min-width: var(--touch-target-comfortable);
}

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

@media (min-width: 992px) {
  .navbar-collapse {
    margin-top: 0;
  }
  
  .navbar-nav {
    display: flex;
    flex-direction: row;
    gap: var(--spacing-md);
  }
}

/* ============================================
   ALERTS
   ============================================ */
.alert {
  border-radius: var(--border-radius);
  padding: var(--spacing-md) var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.alert-enhanced {
  border: none;
  border-left: 3px solid;
}

.alert-danger {
  background: linear-gradient(135deg, rgba(220, 53, 69, 0.15), rgba(220, 53, 69, 0.08));
  border-left-color: var(--color-danger);
  color: #ffb3b3;
}

.alert-success {
  background: linear-gradient(135deg, rgba(25, 135, 84, 0.15), rgba(25, 135, 84, 0.08));
  border-left-color: var(--color-success);
  color: #a3e4c7;
}

.alert-info {
  background: linear-gradient(135deg, rgba(13, 110, 253, 0.15), rgba(13, 110, 253, 0.08));
  border-left-color: #0d6efd;
  color: #a5d8ff;
}

/* ============================================
   MODAL (BOTTOM-SHEET FOR MOBILE)
   ============================================ */
@media (max-width: 575.98px) {
  .modal-dialog {
    display: flex;
    align-items: flex-end;
    min-height: 100%;
    margin: 0;
    max-width: 100%;
  }
  
  /* Slide up animation */
  .modal.fade .modal-dialog {
    transform: translateY(100%);
    transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
  }
  
  .modal.show .modal-dialog {
    transform: translateY(0);
  }
  
  .modal-content {
    border-bottom-left-radius: 0 !important;
    border-bottom-right-radius: 0 !important;
    padding-bottom: env(safe-area-inset-bottom);
    width: 100%;
  }
}

@media (min-width: 576px) {
  .modal-dialog {
    max-width: 500px;
    margin: var(--spacing-xl) auto;
  }
}

.modal-content {
  background: var(--color-bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  color: var(--color-text-primary);
  backdrop-filter: blur(12px) saturate(120%);
}

.modal-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
}

.modal-body {
  padding: var(--spacing-lg);
  max-height: calc(100vh - 200px);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.modal-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column-reverse;
  gap: var(--spacing-md);
}

@media (min-width: 768px) {
  .modal-footer {
    flex-direction: row;
    justify-content: flex-end;
  }
}

.modal-footer .btn {
  width: 100%;
}

@media (min-width: 768px) {
  .modal-footer .btn {
    width: auto;
  }
}

/* ============================================
   CALENDAR (MOBILE-OPTIMIZED)
   ============================================ */
#calendar {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.01));
  padding: var(--spacing-md);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-xl);
  width: 100%;
}

/* FullCalendar mobile adjustments */
.fc .fc-toolbar {
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.fc .fc-toolbar-title {
  font-size: var(--font-size-xl);
  margin: var(--spacing-sm) 0;
}

.fc .fc-button {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  min-height: var(--touch-target-min);
  border-radius: var(--border-radius);
  touch-action: manipulation;
}

.fc .fc-daygrid-event {
  font-size: var(--font-size-xs);
  padding: 2px 4px;
  border-radius: 4px;
}

.fc .fc-event-title {
  font-size: var(--font-size-xs);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.fc .fc-scroller {
  -webkit-overflow-scrolling: touch;
}

@media (max-width: 480px) {
  #calendar {
    padding: var(--spacing-sm);
  }

  .fc .fc-toolbar-title {
    font-size: var(--font-size-lg);
  }

  .fc .fc-button {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
    min-height: var(--touch-target-min);
  }

  .fc .fc-daygrid-day-number {
    font-size: var(--font-size-xs);
  }
}

@media (min-width: 768px) {
  .fc .fc-toolbar {
    flex-direction: row;
  }
  
  .fc .fc-toolbar-title {
    font-size: var(--font-size-2xl);
  }
  
  .fc .fc-button {
    font-size: var(--font-size-base);
    padding: var(--spacing-md) var(--spacing-lg);
  }
  
  .fc .fc-daygrid-event {
    font-size: var(--font-size-sm);
    padding: 4px 6px;
  }
}

/* ============================================
   COLOR CODING
   ============================================ */
.color-selector-group {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  margin-top: var(--spacing-sm);
}

.color-option {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  color: var(--color-text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: var(--font-size-sm);
  flex: 1 1 auto;
  min-width: 0;
  min-height: var(--touch-target-min);
}

.color-option:active {
  transform: scale(0.98);
}

.color-option.active {
  background: rgba(124, 92, 255, 0.2);
  border-color: rgba(124, 92, 255, 0.5);
  box-shadow: 0 0 0 2px rgba(124, 92, 255, 0.3);
}

.color-swatch {
  width: 20px;
  height: 20px;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  flex-shrink: 0;
}

@media (max-width: 576px) {
  .color-option {
    flex: 1 1 100%;
    min-width: 100%;
  }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-4 { margin-top: var(--spacing-lg); }
.py-4 { padding-top: var(--spacing-lg); padding-bottom: var(--spacing-lg); }
.py-5 { padding-top: var(--spacing-xl); padding-bottom: var(--spacing-xl); }

/* ============================================
   TOUCH DEVICE OPTIMIZATIONS
   ============================================ */
@media (hover: none) and (pointer: coarse) {
  /* Remove hover effects on touch devices */
  .btn:hover,
  .card.glass:hover {
    transform: none;
  }
  
  /* Ensure all interactive elements are touch-friendly */
  a, button, input, select, textarea {
    min-height: var(--touch-target-comfortable);
  }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
  .navbar,
  .btn,
  .modal,
  .timezone-display {
    display: none !important;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .card.glass {
    background: white;
    border: 1px solid #ddd;
    box-shadow: none;
  }
}