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

:root {
  --bg: #f5f6fa;
  --text: #333;
  --text-secondary: #999;
  --header-bg: #1a1a2e;
  --header-text: #fff;
  --cell-bg: #fff;
  --cell-hover: #f0f0ff;
  --cell-other: #f9f9fb;
  --border: #ddd;
  --btn-bg: #e8e8ee;
  --btn-hover: #d0d0da;
  --modal-bg: #fff;
  --input-border: #ddd;
  --accent: #4361ee;
  --sunday: #e74c3c;
  --saturday: #3498db;
  --other-text: #bbb;
  --divider: #eee;
  --setting-row-bg: transparent;
  --weekly-am-bg: #eef4ff;
  --weekly-am-hover: #e0ecff;
  --weekly-pm-bg: #fff5ee;
  --weekly-pm-hover: #ffecdf;
}

[data-theme="dark"] {
  --bg: #16161a;
  --text: #e0e0e0;
  --text-secondary: #777;
  --header-bg: #0d0d14;
  --header-text: #ccc;
  --cell-bg: #1e1e26;
  --cell-hover: #2a2a36;
  --cell-other: #1a1a22;
  --border: #2a2a34;
  --btn-bg: #2a2a36;
  --btn-hover: #3a3a46;
  --modal-bg: #22222c;
  --input-border: #3a3a46;
  --accent: #5a7afe;
  --sunday: #ff6b6b;
  --saturday: #74b9ff;
  --other-text: #555;
  --divider: #2a2a34;
  --setting-row-bg: transparent;
  --weekly-am-bg: #1a2030;
  --weekly-am-hover: #222840;
  --weekly-pm-bg: #2a1e1a;
  --weekly-pm-hover: #362620;
}

html, body {
  height: 100%;
  font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background 0.25s, color 0.25s;
}

#calendar {
  display: flex;
  flex-direction: column;
  height: 100vh;
  padding: 16px;
}

/* Header */
.calendar-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 8px 0 12px;
  flex-shrink: 0;
}

.calendar-header h1 {
  font-size: 1.5rem;
  font-weight: 600;
  min-width: 200px;
  text-align: center;
  color: var(--text);
}

.calendar-header button {
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 50%;
  background: var(--btn-bg);
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: background 0.15s, color 0.15s;
}

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

.today-btn {
  width: auto !important;
  padding: 0 14px !important;
  border-radius: 18px !important;
  font-size: 0.8rem !important;
  font-weight: 600;
}

.settings-btn {
  font-size: 1.2rem !important;
  margin-left: 4px;
}

/* Split layout */
.calendar-content {
  display: flex;
  flex: 1;
  gap: 16px;
  overflow: hidden;
}

.monthly-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.weekly-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.panel-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-secondary);
  letter-spacing: 0.1em;
  padding: 0 2px 5px;
}

/* Calendar Grid (Monthly) */
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  grid-template-rows: auto;
  grid-auto-rows: 1fr;
  flex: 1;
  gap: 1px;
  background: var(--border);
  border-radius: 12px;
  overflow: hidden;
}

#day-headers, #calendar-body {
  display: contents;
}

.day-header {
  background: var(--header-bg);
  color: var(--header-text);
  font-size: 0.75rem;
  font-weight: 600;
  text-align: center;
  padding: 5px 0;
  letter-spacing: 0.05em;
}

.day-header.sunday { color: var(--sunday); }
.day-header.saturday { color: var(--saturday); }

/* Day Cells */
.day-cell {
  background: var(--cell-bg);
  padding: 4px 6px;
  min-height: 0;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  transition: background 0.12s;
  overflow: hidden;
}

.day-cell:hover {
  background: var(--cell-hover);
}

.day-cell.other-month {
  background: var(--cell-other);
}

.day-cell.other-month .day-number {
  color: var(--other-text);
}

.day-number {
  font-size: 0.85rem;
  font-weight: 500;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  flex-shrink: 0;
}

.day-cell.today .day-number {
  background: var(--accent);
  color: #fff;
  font-weight: 700;
}

.day-cell.sunday .day-number { color: var(--sunday); }
.day-cell.saturday .day-number { color: var(--saturday); }

.day-cell.today.sunday .day-number,
.day-cell.today.saturday .day-number {
  color: #fff;
}

/* Events inside cells */
.events-container {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: 2px;
  overflow: hidden;
  flex: 1;
}

.event-chip {
  font-size: 0.7rem;
  padding: 2px 5px;
  border-radius: 3px;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.4;
}

.event-more {
  font-size: 0.65rem;
  color: var(--text-secondary);
  padding: 1px 4px;
}

/* Weekly time grid */
.weekly-day-headers {
  display: grid;
  grid-template-columns: 46px repeat(7, 1fr);
  background: var(--header-bg);
  border-radius: 12px 12px 0 0;
  overflow: hidden;
  flex-shrink: 0;
}

.weekly-corner {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 5px 0;
}

.weekly-day-header {
  color: var(--header-text);
  font-size: 0.72rem;
  font-weight: 600;
  text-align: center;
  padding: 5px 2px;
  letter-spacing: 0.02em;
}

.weekly-day-header.sunday { color: var(--sunday); }
.weekly-day-header.saturday { color: var(--saturday); }
.weekly-day-header.today-col {
  background: rgba(67, 97, 238, 0.15);
}

.weekly-scroll {
  flex: 1;
  overflow-x: hidden;
  overflow-y: auto;
  cursor: grab;
  user-select: none;
  border-radius: 0 0 12px 12px;
}

.weekly-scroll:active {
  cursor: grabbing;
}

.weekly-scroll::-webkit-scrollbar {
  width: 5px;
}

.weekly-scroll::-webkit-scrollbar-track {
  background: transparent;
}

.weekly-scroll::-webkit-scrollbar-thumb {
  background: var(--btn-bg);
  border-radius: 3px;
}

.weekly-grid {
  display: grid;
  grid-template-columns: 46px repeat(7, 1fr);
  grid-template-rows: repeat(24, 1fr);
  min-height: calc(100% * 24 / 18);
  gap: 1px;
  background: var(--border);
}

.weekly-time-label {
  font-size: 0.65rem;
  color: var(--text-secondary);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 4px;
  font-weight: 500;
}

.weekly-time-label.am {
  background: var(--weekly-am-bg);
}

.weekly-time-label.pm {
  background: var(--weekly-pm-bg);
}

.weekly-cell {
  padding: 2px 3px;
  overflow: hidden;
  cursor: pointer;
  transition: background 0.12s;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.weekly-cell.am {
  background: var(--weekly-am-bg);
}

.weekly-cell.am:hover {
  background: var(--weekly-am-hover);
}

.weekly-cell.pm {
  background: var(--weekly-pm-bg);
}

.weekly-cell.pm:hover {
  background: var(--weekly-pm-hover);
}

.weekly-cell.today-col {
  border-left: 2px solid var(--accent);
  border-right: 2px solid var(--accent);
}

.weekly-cell.today-col.hour-0 {
  border-top: 2px solid var(--accent);
}

.weekly-cell.today-col.hour-23 {
  border-bottom: 2px solid var(--accent);
}

.weekly-event-chip {
  font-size: 0.58rem;
  padding: 1px 3px;
  border-radius: 2px;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.3;
}

/* AM/PM divider */
.weekly-cell.pm.hour-12 {
  border-top: 2px solid var(--border);
}

.weekly-time-label.pm.hour-12 {
  border-top: 2px solid var(--border);
}

/* Modal shared */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  animation: fadeIn 0.15s ease;
}

.modal-overlay.hidden {
  display: none;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal {
  background: var(--modal-bg);
  border-radius: 14px;
  width: 400px;
  max-width: 92vw;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
  animation: slideUp 0.2s ease;
}

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

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px 10px;
  border-bottom: 1px solid var(--divider);
}

.modal-header h2 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
}

.modal-header button {
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  background: transparent;
  font-size: 1.3rem;
  cursor: pointer;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}

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

/* Settings modal */
.settings-modal {
  width: 380px;
}

.settings-body {
  padding: 12px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.setting-label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
}

.toggle-group {
  display: flex;
  background: var(--btn-bg);
  border-radius: 8px;
  overflow: hidden;
}

.toggle-btn {
  padding: 7px 14px;
  border: none;
  background: transparent;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  color: var(--text-secondary);
  transition: background 0.15s, color 0.15s;
}

.toggle-btn.active {
  background: var(--accent);
  color: #fff;
}

/* Event form */
#event-form {
  padding: 14px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-bottom: 1px solid var(--divider);
}

#event-title {
  width: 100%;
  padding: 9px 12px;
  border: 1.5px solid var(--input-border);
  border-radius: 8px;
  font-size: 0.9rem;
  outline: none;
  background: var(--cell-bg);
  color: var(--text);
  transition: border-color 0.15s;
}

#event-title:focus {
  border-color: var(--accent);
}

.time-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.time-row input[type="time"] {
  flex: 1;
  padding: 7px 10px;
  border: 1.5px solid var(--input-border);
  border-radius: 8px;
  font-size: 0.85rem;
  outline: none;
  background: var(--cell-bg);
  color: var(--text);
  transition: border-color 0.15s;
}

.time-row input[type="time"]:focus {
  border-color: var(--accent);
}

.time-row span {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

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

.color-option input[type="radio"] {
  display: none;
}

.color-option span {
  display: block;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  cursor: pointer;
  border: 3px solid transparent;
  transition: border-color 0.15s, transform 0.1s;
}

.color-option input[type="radio"]:checked + span {
  border-color: var(--text);
  transform: scale(1.15);
}

.btn-save {
  padding: 9px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

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

/* Event list */
#event-list {
  list-style: none;
  padding: 8px 20px 14px;
  overflow-y: auto;
  flex: 1;
}

#event-list:empty {
  display: none;
}

#event-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid var(--divider);
}

#event-list li:last-child {
  border-bottom: none;
}

.event-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.event-info {
  flex: 1;
  min-width: 0;
}

.event-info .ev-title {
  font-size: 0.85rem;
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text);
}

.event-info .ev-time {
  font-size: 0.72rem;
  color: var(--text-secondary);
  margin-top: 1px;
}

.btn-delete {
  width: 26px;
  height: 26px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--other-text);
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.15s, color 0.15s;
}

.btn-delete:hover {
  background: #fee;
  color: #e74c3c;
}

[data-theme="dark"] .btn-delete:hover {
  background: #3a2020;
}