:root {
  color-scheme: light;
  --background: #f4f6fb;
  --surface: #ffffff;
  --surface-muted: #eef1f7;
  --text: #172033;
  --muted: #68758c;
  --border: #dde3ee;
  --accent: #4f8cff;
  --accent-strong: #2f6de6;
  --danger: #dc3f45;
  --shadow: 0 18px 45px rgba(31, 44, 71, 0.08);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 1020px;
  min-height: 100vh;
  color: var(--text);
  background: var(--background);
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

[hidden] {
  display: none !important;
}

.app-shell {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 28px;
  padding: 24px 16px;
  border-right: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(18px);
  position: sticky;
  top: 0;
  height: 100vh;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 8px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 13px;
  color: white;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), #7c5cff);
}

.brand strong,
.brand small {
  display: block;
}

.brand small {
  margin-top: 2px;
  color: var(--muted);
}

.nav {
  display: grid;
  gap: 6px;
}

.nav-item {
  padding: 11px 12px;
  border: 0;
  border-radius: 10px;
  color: var(--muted);
  text-align: left;
  background: transparent;
}

.nav-item:hover,
.nav-item.is-active {
  color: var(--text);
  background: var(--surface-muted);
}

.sidebar-note {
  margin-top: auto;
  padding: 12px;
  border-radius: 12px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
  background: var(--surface-muted);
}

.main {
  min-width: 0;
  padding: 24px;
}

.topbar {
  display: flex;
  justify-content: flex-end;
  min-height: 28px;
  margin-bottom: 8px;
}

.active-timer-badge {
  padding: 7px 12px;
  border-radius: 999px;
  color: #b4232a;
  font-size: 13px;
  font-weight: 700;
  background: #ffe8e9;
}

.view {
  display: none;
}

.view.is-active {
  display: block;
}

.view-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 18px;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 5px;
  font-size: 32px;
  letter-spacing: -0.04em;
}

h2 {
  margin-bottom: 14px;
  font-size: 19px;
}

.muted {
  color: var(--muted);
}

.actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.button {
  padding: 9px 13px;
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  background: var(--surface);
}

.button:hover {
  border-color: #c7d0e1;
  background: #f8faff;
}

.button.primary {
  border-color: var(--accent);
  color: white;
  background: var(--accent);
}

.button.primary:hover {
  background: var(--accent-strong);
}

.button.danger {
  border-color: #f0b7ba;
  color: var(--danger);
}

.button.small {
  padding: 5px 8px;
  border-radius: 7px;
  font-size: 12px;
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.card {
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.legend {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 13px;
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.legend i {
  display: inline-block;
  width: 13px;
  height: 13px;
  border-radius: 4px;
}

.legend-planned {
  border: 1px solid var(--accent);
  background: rgba(79, 140, 255, 0.16);
}

.legend-actual {
  border: 1px solid var(--accent);
  border-left-width: 4px;
  background: rgba(79, 140, 255, 0.16);
}

.timetable-grid {
  display: grid;
  grid-template-columns: 56px repeat(7, minmax(105px, 1fr));
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.corner,
.day-heading,
.time-axis {
  border-bottom: 1px solid var(--border);
  background: #fafbfe;
}

.day-heading {
  padding: 10px 8px;
  text-align: center;
  border-left: 1px solid var(--border);
}

.day-heading:first-of-type {
  border-left: 0;
}

.day-heading .weekday {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.day-heading .day-number {
  display: inline-grid;
  place-items: center;
  min-width: 28px;
  height: 28px;
  margin-top: 3px;
  border-radius: 50%;
  font-weight: 800;
}

.day-heading.is-today .day-number {
  color: white;
  background: var(--accent);
}

.time-axis {
  display: grid;
  grid-template-rows: repeat(19, 60px);
}

.hour-label {
  padding: 0 8px 0 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 14px;
  text-align: right;
}

.day-column {
  position: relative;
  height: 1140px;
  border-left: 1px solid var(--border);
  background-image: linear-gradient(to bottom, var(--border) 1px, transparent 1px);
  background-size: 100% 60px;
}

.day-column.is-today {
  background-color: rgba(79, 140, 255, 0.035);
}

.event {
  position: absolute;
  top: var(--top);
  height: var(--height);
  min-height: 9px;
  overflow: hidden;
  border-radius: 7px;
  font-size: 11px;
  line-height: 1.25;
}

.event-planned {
  left: 4px;
  cursor: pointer;
  width: calc(100% - 8px);
  padding: 4px 5px;
  border: 1px solid color-mix(in srgb, var(--event-color), transparent 35%);
  color: var(--text);
  background: color-mix(in srgb, var(--event-color), transparent 84%);
  z-index: 1;
}

.event-actual {
  left: 6px;
  right: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
  width: auto;
  padding: 4px 24px 4px 8px;
  border: 1px solid color-mix(in srgb, var(--event-color), transparent 15%);
  border-left-width: 4px;
  color: var(--text);
  background: color-mix(in srgb, var(--event-color), transparent 82%);
  box-shadow: 0 3px 8px color-mix(in srgb, var(--event-color), transparent 82%);
  z-index: 2;
}

.event strong,
.event span {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.event-actual strong,
.event-actual span {
  display: inline-block;
}

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

.event-actual .event-duration {
  flex: 0 0 auto;
  font-weight: 800;
  opacity: 0.9;
}

.event-type {
  color: var(--muted);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.event-planned[data-category="course"] {
  border-left-width: 4px;
}

.event-planned[data-category="assignment"] {
  border-style: dashed;
}

.event-planned[data-category="work"] {
  border-left-width: 4px;
  border-left-style: double;
}

.event-planned[data-category="other"] {
  border-style: dotted;
}

.event-actions {
  position: absolute;
  top: 3px;
  right: 3px;
  display: flex;
  gap: 3px;
  opacity: 0;
}

.event-actions.is-visible,
.event:hover .event-actions {
  opacity: 1;
}

.event-actions button {
  width: 18px;
  height: 18px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  color: inherit;
  font-size: 11px;
  line-height: 18px;
  background: rgba(255, 255, 255, 0.65);
}

.event-planned.is-completed {
  border-width: 2px;
  background: color-mix(in srgb, var(--event-color), transparent 68%);
}

.list-card {
  min-height: 160px;
}

.task-row,
.session-row,
.total-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 4px;
  border-bottom: 1px solid var(--border);
}

.task-row.subtask-row {
  margin-left: 28px;
  padding-left: 14px;
  border-left: 2px solid var(--border);
}

.task-row:last-child,
.session-row:last-child,
.total-row:last-child {
  border-bottom: 0;
}

.color-dot {
  flex: 0 0 auto;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--task-color);
}

.row-main {
  min-width: 0;
  flex: 1;
}

.row-title {
  display: block;
  font-weight: 750;
}

.row-subtitle {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 13px;
}

.row-actions {
  display: flex;
  align-items: center;
  gap: 7px;
}

.empty-state {
  padding: 44px 20px;
  color: var(--muted);
  text-align: center;
}

.timer-card {
  max-width: 700px;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.timer-clock {
  margin: 12px 0 18px;
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 58px;
  font-weight: 800;
  letter-spacing: -0.06em;
}

.timer-status {
  display: inline-block;
  margin-bottom: 4px;
  padding: 5px 9px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  background: var(--surface-muted);
}

.timer-status.running {
  color: #b4232a;
  background: #ffe8e9;
}

.timer-actions {
  display: flex;
  gap: 10px;
}

.form-grid {
  display: grid;
  gap: 14px;
}

.field {
  display: grid;
  gap: 6px;
}

.field label {
  font-size: 13px;
  font-weight: 700;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 10px 11px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: white;
}

.field textarea {
  min-height: 80px;
  resize: vertical;
}

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

.weekday-options {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.weekday-option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.weekday-option span {
  display: inline-block;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 750;
  background: white;
}

.weekday-option input:checked + span {
  border-color: var(--accent);
  color: white;
  background: var(--accent);
}

.schedule-mode {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.schedule-mode input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.schedule-mode span {
  display: block;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--muted);
  font-weight: 750;
  text-align: center;
  background: white;
}

.schedule-mode input:checked + span {
  border-color: var(--accent);
  color: var(--accent-strong);
  background: #eef4ff;
}

.mini-calendar {
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fbfcff;
}

.calendar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.calendar-header button {
  width: 28px;
  height: 28px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: white;
}

.calendar-weekdays,
.calendar-days {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 3px;
}

.calendar-weekdays {
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 800;
  text-align: center;
  text-transform: uppercase;
}

.calendar-day {
  height: 31px;
  border: 0;
  border-radius: 8px;
  color: var(--text);
  font-size: 12px;
  font-weight: 650;
  background: transparent;
}

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

.calendar-day.is-outside {
  color: #a9b2c5;
}

.calendar-day.is-today {
  box-shadow: inset 0 0 0 1px var(--accent);
}

.calendar-day.is-selected {
  color: white;
  background: var(--accent);
}

.color-option {
  width: 28px;
  height: 28px;
  border: 3px solid transparent;
  border-radius: 50%;
  background: var(--swatch);
}

.color-option.is-selected {
  border-color: white;
  box-shadow: 0 0 0 2px var(--swatch);
}

.form-error {
  color: var(--danger);
  font-size: 13px;
  font-weight: 700;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(13, 20, 34, 0.38);
  z-index: 10;
}

.modal-backdrop[hidden] {
  display: none;
}

.modal-card {
  width: min(480px, 100%);
  padding: 22px;
  border-radius: 18px;
  background: white;
  box-shadow: 0 25px 70px rgba(15, 25, 45, 0.25);
}

.modal-card h2 {
  margin-bottom: 18px;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 9px;
  margin-top: 18px;
}

.section-gap {
  height: 18px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.stat-card {
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.stat-card span {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.stat-card strong {
  display: block;
  margin-top: 10px;
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 28px;
}

.stats-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(300px, 0.8fr);
  gap: 18px;
}

.week-chart {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  align-items: end;
  gap: 12px;
  height: 240px;
  padding-top: 10px;
}

.chart-day {
  display: grid;
  grid-template-rows: 1fr auto;
  align-items: end;
  height: 100%;
  min-width: 0;
}

.chart-bar-wrap {
  display: flex;
  align-items: end;
  justify-content: center;
  height: 100%;
}

.chart-bar {
  width: 100%;
  max-width: 52px;
  min-height: 4px;
  height: var(--bar-height);
  border-radius: 8px 8px 3px 3px;
  background: linear-gradient(to top, var(--accent), #7c5cff);
}

.chart-label,
.chart-value {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}

.chart-value {
  margin-top: 1px;
  color: var(--text);
  font-weight: 700;
}

@media (max-width: 1100px) {
  body {
    min-width: 760px;
  }

  .app-shell {
    grid-template-columns: 190px minmax(0, 1fr);
  }

  .stats-grid,
  .stats-layout {
    grid-template-columns: 1fr 1fr;
  }
}