/* ============================================
   VARIABLES & FOUNDATIONS
   ============================================ */

:root {
  --color-primary: #2c3e50;
  --color-accent: #3498db;
  --color-accent-warm: #e74c3c;
  --color-text: #2c3e50;
  --color-text-light: #7f8c8d;
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fa;
  --color-border: #ecf0f1;
  --color-success: #27ae60;
  
  --font-display: 'Crimson Text', 'Georgia', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  
  --radius: 8px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   RESET & BASE
   ============================================ */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: 0.5px;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--color-accent-warm);
}

/* ============================================
   LAYOUT
   ============================================ */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ============================================
   HEADER
   ============================================ */

.header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: var(--spacing-xl) var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--spacing-xl);
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .header {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--spacing-lg) var(--spacing-md);
  }
}

.header-content {
  flex: 1;
}

.title {
  margin-bottom: var(--spacing-xs);
  animation: fadeInDown 0.6s ease-out;
}

.subtitle {
  color: var(--color-text-light);
  font-size: 0.95rem;
  font-weight: 400;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.header-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-accent);
  color: white;
  box-shadow: 0 2px 8px rgba(52, 152, 219, 0.2);
}

.btn-primary:hover {
  background-color: #2980b9;
  box-shadow: 0 4px 16px rgba(52, 152, 219, 0.3);
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: rgba(52, 152, 219, 0.05);
}

/* ============================================
   MONTH NAVIGATOR
   ============================================ */

.month-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-md) 0;
  border-bottom: 2px solid var(--color-border);
}

.month-title {
  flex: 1;
  text-align: center;
  font-size: 1.75rem;
}

.nav-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-accent);
  padding: var(--spacing-sm);
  transition: var(--transition);
  border-radius: var(--radius);
}

.nav-btn:hover {
  background-color: var(--color-bg-alt);
  color: var(--color-accent-warm);
}

/* ============================================
   CALENDAR GRID
   ============================================ */

.calendar-grid {
  background-color: var(--color-bg-alt);
  border-radius: var(--radius);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
}

.weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.weekday {
  text-align: center;
  font-weight: 600;
  color: var(--color-text-light);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: var(--spacing-sm) 0;
}

.days {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: var(--spacing-sm);
  min-height: 400px;
}

.day {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--spacing-sm);
  min-height: 80px;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.day:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(52, 152, 219, 0.15);
  transform: translateY(-2px);
}

.day.other-month {
  opacity: 0.4;
  background-color: transparent;
}

.day.today {
  background-color: rgba(52, 152, 219, 0.1);
  border: 2px solid var(--color-accent);
}

.day-number {
  font-weight: 600;
  color: var(--color-text);
  font-size: 0.95rem;
  margin-bottom: var(--spacing-xs);
}

.day-events {
  font-size: 0.7rem;
  color: var(--color-text-light);
  flex: 1;
  overflow: hidden;
}

.day-event-item {
  background-color: var(--color-accent);
  color: white;
  padding: 2px 4px;
  border-radius: 3px;
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.2;
}

.day-event-item.urgent {
  background-color: var(--color-accent-warm);
}

/* ============================================
   EVENTS SECTION
   ============================================ */

.events-section {
  margin-bottom: var(--spacing-xl);
}

.section-title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--color-border);
}

.events-list {
  display: grid;
  gap: var(--spacing-md);
}

.event-card {
  background-color: var(--color-bg-alt);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius);
  padding: var(--spacing-md);
  transition: var(--transition);
  animation: slideInLeft 0.4s ease-out;
}

.event-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
  transform: translateX(4px);
  border-left-color: var(--color-accent-warm);
}

.event-card.urgent {
  border-left-color: var(--color-accent-warm);
}

.event-date {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
  margin-bottom: var(--spacing-sm);
  font-size: 0.9rem;
  color: var(--color-text-light);
  font-weight: 500;
}

.event-date::before {
  content: '📅';
  display: inline-block;
}

.event-title {
  font-size: 1.2rem;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
}

.event-description {
  color: var(--color-text-light);
  font-size: 0.95rem;
  line-height: 1.5;
}

.event-location {
  margin-top: var(--spacing-sm);
  color: var(--color-text-light);
  font-size: 0.9rem;
}

.event-location::before {
  content: '📍 ';
}

.loading {
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--color-text-light);
  font-style: italic;
}

.no-events {
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--color-text-light);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-lg) var(--spacing-md);
  text-align: center;
  color: var(--color-text-light);
  font-size: 0.9rem;
}

/* ============================================
   TOAST NOTIFICATION
   ============================================ */

.toast {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  background-color: var(--color-success);
  color: white;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition);
  pointer-events: none;
  max-width: 300px;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* ============================================
   ANIMATIONS
   ============================================ */

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

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

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-sm);
  }

  .title {
    font-size: 2rem;
  }

  .days {
    min-height: 300px;
  }

  .day {
    min-height: 60px;
    padding: var(--spacing-xs);
  }

  .day-event-item {
    font-size: 0.6rem;
  }

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

  .toast {
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    left: var(--spacing-md);
    max-width: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}