/* ---------- THEME VARIABLES ---------- */
:root {
  --bg: #ffffff;
  --text: #000000;
  --border: #000000;
  --event-bg: #e0e0e0;
}

.dark {
  --bg: #121212;
  --text: #ffffff;
  --border: #444444;
  --event-bg: #333333;
}

/* ---------- BASE ---------- */
body {
  background: var(--bg);
  color: var(--text);
  font-family: Arial, sans-serif;
  transition: background 0.3s ease, color 0.3s ease;
}

.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.controls {
  margin-bottom: 10px;
}

/* ---------- LIGHT/DARK MODE ---------- */
select {
  background-color: #ffffff;
  color: #000000;
  border: 1px solid #ccc;
}
body.dark select {
  background-color: #2b2b2b;
  color: #ffffff;
  border: 1px solid #555;
}
body.dark option {
  background-color: #2b2b2b;
  color: #ffffff;
}


/* ---------- COURSE DROPDOWN ---------- */
#courseSelect {
  padding: 5px 8px;
  font-size: 0.9em;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
}

#courseSelect:hover {
  background: rgba(0, 0, 0, 0.05);
}

.dark #courseSelect:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* ---------- WEEKDAY ---------- */
.weekday-header {
  display:grid;
  grid-template-columns:repeat(7, 1fr);
  font-weight:bold;
  gap:5px;
}

.weekday-header div {
  text-align:center;
  border:1px solid var(--border);
  padding:4px 0;
  background:var(--bg);
  color:var(--text);
}

.calendar-wrapper {
  width:100%;
  padding:0 10px;
  box-sizing:border-box;
}

/* ---------- CALENDAR ---------- */
.calendar {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 5px;
}

.Today {
  background:rgba(0, 150, 255, 0.15);
  border:2px solid rgba(0, 150, 255, 0.5);
}

.dark .Today {
  background:rgba(0, 150, 255, 0.25);
}


.day {
  border: 1px solid var(--border);
  padding: 6px;
  min-height: 160px;
  position: relative;
  display:flex;
  flex-direction:column;
  transition: background 0.3s ease, border-color 0.3s ease;
}

.day-events {
  position: relative;
  height: 144px;
  width: 100%;
  margin-top: 4px;
  overflow-y: auto;
}

.day-number {
  font-weight: bold;
}

.day:hover {
  background:rgba(0, 0, 0, 0.03);
}

.dark .day:hover {
  background:rgba(255, 255, 255, 0.05);
}

/* ---------- EVENTS ---------- */
.event {
  position: absolute;
  left: 4px;
  right: 4px;
  font-size: 0.75em;
  line-height: 1.2;
  margin-top: 3px;
  padding: 3px 4px;
  border-radius: 3px;
  color: white;
  cursor: pointer;
  overflow: hidden;
}

.event-title {
  font-size: 0.85em;
  font-weight: bold;
  white-space: normal;
  word-break: break-word;
}

.event-time {
  font-size: 0.65em;
  opacity: 0.7;
  margin-top: 2px;
  white-space: nowrap;
}

.event:hover {
  filter: brightness(1.15);
}

.delete-all-btn {
  background: #b71c1c;
  color: white;
  border: none;
  padding: 6px 10px;
  border-radius: 4px;
  cursor: pointer;
  margin-top: 20px;
  display: block;
  width: 100%;
}

.delete-all-btn:hover {
  background: #7f0000;
}

/* ---------- ALL-IN-ONE ---------- */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
}

.hidden {
  display: none;
}

.modal-content {
  background: var(--bg);
  color: var(--text);
  padding: 15px;
  border-radius: 6px;
  width: 260px;
  transition: background 0.3s ease, color 0.3s ease;
}

.modal-content label {
  display: block;
  margin-bottom: 8px;
}

.modal-buttons {
  display: flex;
  justify-content: space-between;
  margin-top: 10px;
}

/* ---------- THEMES ---------- */
:root {
  --bg: #f5f5f5;
  --surface: #ffffff;
  --text: #1a1a1a;
  --text-muted: #666666;
  --border: #e0e0e0;
  --accent: #5c6bc0;
  --accent-text: #ffffff;
  --today-bg: #e8eaf6;
  --today-border: #5c6bc0;
  --hover: #f0f0f0;
  --modal-overlay: rgba(0, 0, 0, 0.3);
}

.dark {
  --bg: #1a1a2e;
  --surface: #16213e;
  --text: #e8e8e8;
  --text-muted: #9e9e9e;
  --border: #2a2a4a;
  --accent: #7986cb;
  --accent-text: #000000;
  --today-bg: #1e2a4a;
  --today-border: #5c6bc0;
  --hover: #1e1e3a;
  --modal-overlay: rgba(0, 0, 0, 0.6);
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 14px;
  transition: background 0.3s ease, color 0.3s ease;
}

/* TOP BAR */
.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.top-bar h1 {
  font-size: 1.3em;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.5px;
}

/* BUTTONS */
button {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 6px 14px;
  font-size: 0.9em;
  cursor: pointer;
  transition: background 0.2s ease;
}

button:hover {
  background: var(--hover);
}

/* NAV CONTROLS */
.nav-controls {
  display: flex;
  gap: 8px;
  padding: 12px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

/* FILTER CONTROLS */
.filter-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.9em;
}

/* DROPDOWNS */
select {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 5px 8px;
  font-size: 0.9em;
  cursor: pointer;
}

select:hover {
  background: var(--hover);
}

body.dark select, body.dark option {
  background: var(--surface);
  color: var(--text);
}

#courseSelect {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}

/* CALENDAR WRAPPER */
.calendar-wrapper {
  width: 100%;
  padding: 16px 20px;
}

/* WEEKLY HEADER */
.weekday-header {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
  margin-bottom: 4px;
}

.weekday-header div {
  text-align: center;
  padding: 6px 0;
  font-size: 0.8em;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: transparent;
  border: none;
}

/* CALENDAR GRID */
.calendar {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
}

.day {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 6px;
  min-height: 130px;
  position: relative;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  transition: background 0.2s ease;
}

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

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

.Today {
  background: var(--today-bg);
  border: 1px solid var(--today-border);
}

.dark .Today {
  background: var(--today-bg);
}

/* DAY NUMBER */
.day-number {
  font-size: 0.85em;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.Today .day-number {
  color: var(--accent);
}

/* DAY EVENTS */
.day-events {
  position: relative;
  flex: 1;
  width: 100%;
  margin-top: 2px;
  overflow-y: auto;
}

/* EVENTS */
.event {
  position: absolute;
  left: 2px;
  right: 2px;
  font-size: 0.72em;
  padding: 2px 4px;
  cursor: pointer;
  overflow: hidden;
  transition: filter 0.15s ease;
}

.event:hover {
  filter: brightness(1.12);
}

.event-title {
  font-size: 0.85em;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.event-title {
  font-size: 0.75em;
  opacity: 0.8;
  margin-top: 1px;
  white-space: nowrap;
}

/* MODAL */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--modal-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
}

.hidden {
  display: none;
}

.modal-content {
  background: var(--surface);
  color: var(--text);
  padding: 20px;
  width: 280px;
  border: 1px solid var(--border);
}

.modal-content h3 {
  font-size: 1em;
  font-weight: 600;
  margin-bottom: 14px;
  color: var(--text);
}

.modal-content label {
  display: block;
  margin-bottom: 10px;
  font-size: 0.85em;
  color: var(--text-muted);
}

.modal-content input[type="text"], .modal-content input[type="date"] {
  width: 100%;
  padding: 6px 8px;
  margin-top: 3px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  font-size: 0.95em;
  display: block;
}

.modal-content input:focus {
  outline: none;
  border-color: var(--accent);
}

.modal-buttons {
  display: flex;
  justify-content: space-between;
  margin-top: 14px;
  gap: 8px;
}

.modal-buttons button {
  flex: 1;
}

#saveEvent {
  background: var(--accent);
  color: var(--accent-text);
  border: none;
}

#saveEvent:hover {
  opacity: 0.9;
  background: var(--accent);
}

/* DELETE BUTTON */
.delete-btn {
  margin-top: 12px;
  width: 100%;
  background: transparent;
  color: #c62828;
  border: 1px solid #c62828;
}

.delete-btn:hover {
  background: #c62828;
  color: white;
}

.delete-all-btn {
  background: transparent;
  color: #b71c1c;
  border: 1px solid #b71c1c;
  padding: 6px 10px;
  cursor: pointer;
  margin-top: 20px;
  display: block;
  width: 100%;
}

.delete-all-btn:hover {
  background: #b71c1c;
  color: white;
}

/* SCROLLBAR */
.day-events::-webkit-scrollbar {
  width: 3px;
}

.day-events::-webkit-scrollbar-thumb {
  background: var(--border);
}

/* TABS */
.tab-bar {
  display: flex;
  gap: 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 20px;
}

.tab {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 10px 18px;
  font-size: 0.9em;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.tab:hover {
  color: var(--text);
  background: transparent;
}

.tab.active {
  color: var(--accent);
  border-bottom: 2px solid var(--accent);
}

/* WEEK VIEW */
.week-nav {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

#weekLabel {
  font-size: 0.95em;
  font-weight: 600;
  flex: 1;
  text-align: center;
}

.week-grid-wrapper {
  display: flex;
  padding: 0 20px 20px;
  overflow-x: auto;
}

.week-time-col {
  display: flex;
  flex-direction: column;
  width: 48px;
  flex-shrink: 0;
}

.week-allday-spacer {
  height: 48px;
  min-height: 48px;
  flex-shrink: 0;
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
  padding: 4px 6px 0 0;
  font-size: 0.65em;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.week-hour-label {
  font-size: 0.7em;
  color: var(--text-muted);
  text-align: right;
  padding-right: 6px;
  display: flex;
  align-items: flex-start;
  transform: translateY(-0.5em);
}

.week-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  flex: 1;
  min-width: 560px;
}

.week-col {
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.week-col:last-child {
  border-right: 1px solid var(--border);
}

.week-past {
  opacity: 0.45;
}

.week-today .week-col-header {
  color: var(--accent);
}

.week-col-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 4px;
  border-bottom: 1px solid var(--border);
  height: 64px;
  justify-content: center;
}

.week-header-spacer {
  height: 64px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.week-day-name {
  font-size: 0.7em;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

.week-today .week-day-name, .week-today .week-day-num {
  color: var(--accent);
}

.week-day-num {
  font-size: 1.2em;
  font-weight: 700;
}

.week-allday-row {
  height: 48px;
  min-height: 48px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border);
  padding: 2px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.week-allday-chip {
  font-size: 0.7em;
  padding: 2px 4px;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.week-allday-chip:hover {
  filter: brightness(1.12);
}

.week-time-grid {
  position: relative;
  flex: 1;
}

.week-hour-line {
  position: absolute;
  left: 0;
  right: 0;
  border-top: 1px solid var(--border);
  pointer-events: none;
}

.week-event {
  position: absolute;
  left: 2px;
  right: 2px;
  font-size: 0.72em;
  padding: 2px 4px;
  overflow: hidden;
  cursor: pointer;
  transition: filter 0.15s ease;
}

.week-event:hover {
  filter: brightness(1.12);
}

.week-event-title {
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.week-event-time {
  font-size: 0.85em;
  opacity: 0.8;
}

.week-allday-label {
  font-size: 0.65em;
  color: var(--text-muted);
  padding: 2px 4px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}