@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --text-dark: #0f172a;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --success: #10b981;
  --highlight: #e0e7ff;
  --input-bg: #f8fafc;
  --input-focus-bg: #ffffff;
}

[data-theme="dark"] {
  --primary: #6366f1;
  --primary-hover: #818cf8;
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --text-dark: #f8fafc;
  --text-muted: #94a3b8;
  --border-color: #334155;
  --highlight: rgba(99, 102, 241, 0.2);
  --input-bg: #0f172a;
  --input-focus-bg: #1e293b;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Inter', sans-serif;
}

.sun-icon { display: none; }
.moon-icon { display: block; }
[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }

body {
  background-color: var(--bg-color);
  color: var(--text-dark);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background-color: var(--card-bg);
  box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
}

main {
  flex: 1;
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 2.5rem;
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  max-width: 600px;
  margin: 2rem auto;
}

h1, h2, h3 {
  margin-bottom: 1rem;
}

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

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

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

input[type="text"] {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
  background-color: var(--input-bg);
  color: var(--text-dark);
}

input[type="text"]:focus {
  outline: none;
  background-color: var(--input-focus-bg);
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

.btn {
  display: inline-block;
  background-color: var(--primary);
  color: #fff;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s, box-shadow 0.2s;
  text-decoration: none;
  text-align: center;
  box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.3);
}

.btn:hover {
  background-color: var(--primary-hover);
  box-shadow: 0 6px 8px -1px rgba(79, 70, 229, 0.4);
}

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

.btn-block {
  width: 100%;
}

/* Event View Specifics */

.event-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.event-title {
  font-size: 2rem;
  font-weight: 700;
}

.view-toggles {
  display: flex;
  gap: 0.25rem;
  background: var(--bg-color);
  padding: 0.25rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.view-toggle {
  padding: 0.5rem 1rem;
  border-radius: 6px;
  border: none;
  background: transparent;
  cursor: pointer;
  font-weight: 500;
  color: var(--text-muted);
  transition: 0.2s;
}

.view-toggle.active {
  background: var(--card-bg);
  color: var(--text-dark);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.main-content {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 2rem;
}

@media (max-width: 800px) {
  .main-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  header {
    flex-wrap: wrap;
    gap: 1rem;
  }
  .event-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  .event-title {
    font-size: 1.75rem;
  }
  .calendar-day-header {
    font-size: 0.75rem;
  }
}

/* Calendar Styling */
.calendar-container {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
}

.calendar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  font-weight: 600;
  font-size: 1.25rem;
}

.calendar-header button {
  background: transparent;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--text-muted);
  border-radius: 8px;
  transition: background 0.2s, color 0.2s;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.calendar-header button:hover {
  background: var(--bg-color);
  color: var(--text-dark);
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 8px;
}

.calendar-day-header {
  text-align: center;
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.875rem;
  padding-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.calendar-day {
  aspect-ratio: 1;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  position: relative;
  cursor: pointer;
  transition: all 0.2s ease;
  background: var(--card-bg);
}

.calendar-day:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.calendar-day.empty {
  background: transparent;
  border: none;
  cursor: default;
}

.calendar-day.empty:hover {
  transform: none;
  box-shadow: none;
}

.calendar-day[data-tooltip]:hover::after,
.calendar-day.show-tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text-dark);
  color: var(--card-bg);
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  font-size: 0.8rem;
  white-space: pre-wrap;
  z-index: 20;
  pointer-events: none;
  text-align: center;
  width: max-content;
  max-width: 180px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.15);
  margin-bottom: 6px;
}

.calendar-day[data-tooltip]:hover::before,
.calendar-day.show-tooltip::before {
  content: '';
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  border-width: 6px;
  border-style: solid;
  border-color: var(--text-dark) transparent transparent transparent;
  margin-bottom: -6px;
  z-index: 20;
}

.theme-toggle {
  background: transparent;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--text-dark);
  padding: 0.5rem;
  border-radius: 50%;
  transition: 0.2s;
}

.theme-toggle:hover {
  background: var(--border-color);
}

.calendar-day .day-number {
  position: absolute;
  top: 8px;
  right: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-dark);
}

.calendar-day .avail-count {
  position: absolute;
  bottom: 8px;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-dark);
  background: var(--card-bg);
  box-shadow: 0 1px 2px rgba(0,0,0,0.2);
  margin: 0 4px;
  padding: 2px 0;
  border-radius: 4px;
}

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

.calendar-day.selected .day-number {
  color: white;
}

.calendar-day.selected .avail-count {
  background: rgba(255, 255, 255, 0.2);
  color: white;
}

/* Sidebar Participant List */
.sidebar {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  height: fit-content;
}

.sidebar h3 {
  margin-top: 0;
  margin-bottom: 1rem;
  font-size: 1.125rem;
  color: var(--text-dark);
}

.participant-list {
  list-style: none;
  max-height: 300px;
  overflow-y: auto;
  margin-bottom: 1.5rem;
}

.participant-list::-webkit-scrollbar {
  width: 6px;
}
.participant-list::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

.participant-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.participant-list li::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
}

.participant-list li:last-child {
  border-bottom: none;
}

#toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--text-dark);
  color: white;
  padding: 1rem 1.5rem;
  border-radius: 8px;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.3s, transform 0.3s;
  pointer-events: none;
  z-index: 1000;
}
#toast.show {
  opacity: 1;
  transform: translateY(0);
}