:root {
  /* Layout and UI variables */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, "Apple Color Emoji", Arial, sans-serif, "Segoe UI Emoji", "Segoe UI Symbol";
  --border-radius: 4px;
  --transition: all 0.2s ease;
  
  --slot-height: 16px; /* 15 mins */
  --hour-height: calc(var(--slot-height) * 4); /* 64px */
}

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

body {
  font-family: var(--font-family);
  background-color: var(--color-bg-default);
  color: var(--color-text-default);
  line-height: 1.5;
  transition: background-color 0.2s, color 0.2s;
  overflow-y: scroll;
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border-color);
  background: var(--color-bg-default);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header h1 {
  font-size: 20px;
  font-weight: 600;
}

/* Buttons */
.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px 12px;
  border-radius: var(--border-radius);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  font-family: inherit;
}

.btn-primary {
  background-color: var(--color-text-default);
  color: var(--color-bg-default);
}

.btn-primary:hover {
  opacity: 0.9;
}

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

.btn-secondary:hover {
  background-color: var(--grid-line-color);
}

.btn-danger {
  color: #dc2626;
  background-color: transparent;
}

.btn-danger:hover {
  background-color: #fee2e2;
  color: #dc2626;
}

[data-theme="dark"] .btn-primary {
  /* Inherit the colors since var(--color-text-default) adapts automatically */
}

[data-theme="dark"] .btn-danger {
  color: #ef4444;
}

[data-theme="dark"] .btn-danger:hover {
  background-color: rgba(239, 68, 68, 0.2);
}

/* Calendar Layout */
.calendar-container {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 65px);
  width: 100%;
  margin: 0 auto;
  overflow-y: auto;
  overflow-x: auto;
}

.calendar-header {
  display: grid;
  grid-template-columns: 60px repeat(7, 1fr);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  background-color: var(--color-bg-default);
  z-index: 90;
  min-width: 800px;
}

.calendar-container.hide-weekends .calendar-header {
  grid-template-columns: 60px repeat(5, 1fr);
}

.day-col, .time-zone-col {
  padding: 12px 8px;
  text-align: center;
  font-size: 14px;
  font-weight: 500;
  color: var(--ui-text-muted);
  border-right: 1px solid var(--border-color);
}

.time-zone-col {
  font-size: 12px;
  text-align: right;
  padding-right: 8px;
  border-right: none;
}

.day-col:last-child {
  border-right: none;
}

.calendar-body {
  display: grid;
  grid-template-columns: 60px repeat(7, 1fr);
  flex-grow: 1;
  position: relative;
  background-color: var(--color-bg-default);
  min-width: 800px;
}

.calendar-container.hide-weekends .calendar-body {
  grid-template-columns: 60px repeat(5, 1fr);
}

/* Time axis */
.time-axis {
  position: relative;
  border-right: 1px solid var(--border-color);
}

.hour-label {
  position: absolute;
  left: 0;
  right: 0;
  font-size: 12px;
  color: var(--ui-text-muted);
  text-align: right;
  padding-right: 8px;
  transform: translateY(-8px); /* Center on the line */
}

/* Day columns */
.day-column {
  position: relative;
  border-right: 1px solid var(--border-color);
  overflow: hidden; /* clip events outside time range */
}

.day-column:last-child {
  border-right: none;
}

/* Hide weekend logic */
.calendar-container.hide-weekends .day-col[data-day="5"],
.calendar-container.hide-weekends .day-col[data-day="6"],
.calendar-container.hide-weekends .day-column[data-day="5"],
.calendar-container.hide-weekends .day-column[data-day="6"] {
  display: none;
}

/* Grid lines */
.hour-grid-line {
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background-color: var(--grid-line-color);
  pointer-events: none;
}

.quarter-grid-line {
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background-color: transparent; /* Invisible but clickable via slots */
  pointer-events: none;
}

/* Clickable Slots */
.time-slot {
  position: absolute;
  left: 0;
  right: 0;
  cursor: pointer;
  z-index: 1;
}

.time-slot:hover {
  background-color: var(--color-pill-default); /* Very subtle gray from palette */
  border-radius: var(--border-radius);
}

.time-slot:active {
  background-color: var(--color-pill-gray); /* Slightly more noticeable gray */
  border-radius: var(--border-radius);
}

/* Events */
.event {
  position: absolute;
  left: 2px;
  right: 2px;
  border-radius: var(--border-radius);
  padding: 4px;
  font-size: 12px;
  overflow: hidden;
  cursor: pointer;
  z-index: 10;
  box-shadow: var(--shadow-sm);
  transition: opacity 0.2s, transform 0.1s;
}

.event:hover {
  opacity: 0.9;
  transform: scale(1.01);
  box-shadow: var(--shadow-md);
}

.event-title {
  font-weight: 500;
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.event-centered {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.event-centered .event-title {
  font-size: 14px;
  white-space: normal;
  margin-bottom: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
}

.event-time {
  font-size: 10px;
  opacity: 0.8;
}

.event-ghost {
  pointer-events: none;
  background-color: var(--color-pill-gray); /* Subtle gray */
  border-radius: var(--border-radius);
  box-shadow: none;
  z-index: 20;
  left: 0;
  right: 0;
}

/* Dynamic color classes for events */
.bg-default { background-color: var(--color-bg-default); color: var(--color-text-default); border: 1px solid var(--border-color); }
.bg-gray { background-color: var(--color-bg-gray); color: var(--color-text-default); }
.bg-brown { background-color: var(--color-bg-brown); color: var(--color-text-brown); }
.bg-orange { background-color: var(--color-bg-orange); color: var(--color-text-orange); }
.bg-yellow { background-color: var(--color-bg-yellow); color: var(--color-text-yellow); }
.bg-green { background-color: var(--color-bg-green); color: var(--color-text-green); }
.bg-blue { background-color: var(--color-bg-blue); color: var(--color-text-blue); }
.bg-purple { background-color: var(--color-bg-purple); color: var(--color-text-purple); }
.bg-pink { background-color: var(--color-bg-pink); color: var(--color-text-pink); }
.bg-red { background-color: var(--color-bg-red); color: var(--color-text-red); }

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(15, 15, 15, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
  backdrop-filter: blur(2px);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background-color: var(--color-bg-default);
  border-radius: 8px;
  box-shadow: var(--shadow-md);
  width: 100%;
  max-width: 400px;
  padding: 24px;
  transform: translateY(20px);
  transition: transform 0.2s;
}

.modal-overlay.active .modal {
  transform: translateY(0);
}

.modal h2 {
  margin-bottom: 20px;
  font-size: 18px;
  font-weight: 600;
}

.form-group {
  margin-bottom: 16px;
}

.form-row {
  display: flex;
  gap: 16px;
}

.form-row .form-group {
  flex: 1;
}

label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--ui-text-muted);
  margin-bottom: 6px;
}

input, select {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  background-color: var(--color-bg-default);
  color: var(--color-text-default);
  font-family: inherit;
  font-size: 14px;
}

input:focus, select:focus {
  outline: none;
  border-color: var(--color-text-default);
  box-shadow: 0 0 0 2px var(--grid-line-color);
}

.color-picker {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.color-option {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  cursor: pointer;
  border: 1px solid rgba(0,0,0,0.1);
  transition: transform 0.1s;
}

.color-option:hover {
  transform: scale(1.1);
}

.color-option.selected {
  outline: 2px solid var(--color-text-default);
  outline-offset: 2px;
}

.color-option.default { background-color: var(--color-bg-default); }
.color-option.gray { background-color: var(--color-bg-gray); }
.color-option.brown { background-color: var(--color-bg-brown); }
.color-option.orange { background-color: var(--color-bg-orange); }
.color-option.yellow { background-color: var(--color-bg-yellow); }
.color-option.green { background-color: var(--color-bg-green); }
.color-option.blue { background-color: var(--color-bg-blue); }
.color-option.purple { background-color: var(--color-bg-purple); }
.color-option.pink { background-color: var(--color-bg-pink); }
.color-option.red { background-color: var(--color-bg-red); }

.modal-actions {
  display: flex;
  justify-content: space-between;
  margin-top: 24px;
}

.actions-right {
  display: flex;
  gap: 8px;
  margin-left: auto;
}

/* Toggle Switch */
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-bg-gray);
  transition: .4s;
  border-radius: 24px;
  box-shadow: inset 0 0 2px rgba(0,0,0,0.1);
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: var(--color-bg-default);
  transition: .4s;
  border-radius: 50%;
  box-shadow: var(--shadow-sm);
}

input:checked + .slider {
  background-color: var(--color-text-default);
}

input:checked + .slider:before {
  transform: translateX(20px);
}

/* Segmented Control */
.segmented-control {
  display: flex;
  background: var(--grid-line-color);
  border-radius: var(--border-radius);
  padding: 4px;
  gap: 4px;
}

.segmented-control input {
  display: none;
}

.segmented-control label {
  flex: 1;
  text-align: center;
  padding: 6px;
  margin: 0;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  font-size: 13px;
  font-weight: 500;
  color: var(--ui-text-muted);
}

.segmented-control input:checked + label {
  background: var(--color-bg-default);
  box-shadow: var(--shadow-sm);
  color: var(--color-text-default);
}

/* Share Popup */
.share-popup {
  position: absolute;
  top: calc(100% + 8px);
  right: 0; /* Align with the right of the actions container */
  background-color: var(--color-bg-default);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: var(--shadow-md);
  padding: 8px;
  display: flex;
  gap: 8px;
  align-items: center;
  z-index: 100;
  width: 300px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.2s ease;
}

.share-popup.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.share-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-default);
  white-space: nowrap;
}

.share-input {
  flex: 1;
  border: 1px solid var(--border-color);
  background-color: var(--color-bg-default);
  color: var(--color-text-default);
  padding: 6px 8px;
  border-radius: var(--border-radius);
  font-size: 13px;
  outline: none;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
}

.share-input:focus {
  border-color: var(--color-text-default);
}