:root {
  --bg: #1c1c1e;
  --bg-sidebar: #1a1a1c;
  --card: #232325;
  --card-alt: #28282a;
  --border: #323234;
  --text: #f2f2f3;
  --text-dim: #9a9a9e;
  --text-faint: #6c6c70;
  --accent: #4f8ef7;
  --accent-soft: #4f8ef71a;
  --radius-lg: 14px;
  --radius-md: 10px;
  --radius-sm: 7px;
  --font: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}

.app {
  display: flex;
  min-height: 100vh;
}

/* ===================== SIDEBAR ===================== */

.sidebar {
  width: 260px;
  flex-shrink: 0;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  padding: 18px 14px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.calendar-card, .categories-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 14px;
  border: 1px solid var(--border);
}

.calendar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.calendar-title {
  font-weight: 600;
  font-size: 13px;
}

.nav-btn {
  background: var(--card-alt);
  border: 1px solid var(--border);
  color: var(--text-dim);
  width: 24px;
  height: 24px;
  border-radius: 7px;
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, color 0.15s;
}
.nav-btn:hover { background: #34343a; color: var(--text); }

.weekday-row {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  text-align: center;
  color: var(--text-faint);
  font-size: 11px;
  margin-bottom: 4px;
}

.days-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  row-gap: 4px;
}

.day {
  position: relative;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 12.5px;
  cursor: pointer;
  color: var(--text);
  transition: background 0.15s;
}
.day:hover { background: var(--card-alt); }
.day.empty { cursor: default; }
.day.empty:hover { background: none; }
.day.selected { background: var(--accent); color: white; font-weight: 600; }
.day.is-today:not(.selected) { border: 1px solid var(--accent); }

.day-dots {
  position: absolute;
  bottom: 2px;
  display: flex;
  gap: 2px;
}
.dot { width: 4px; height: 4px; border-radius: 50%; }

.today-link {
  text-align: center;
  color: var(--accent);
  font-size: 12.5px;
  margin-top: 10px;
  cursor: pointer;
}
.today-link:hover { text-decoration: underline; }

.categories-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-faint);
  font-size: 11px;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
  padding: 0 2px;
}
.hamburger { cursor: pointer; }

.category-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  margin-bottom: 2px;
  transition: background 0.15s;
}
.category-item:hover { background: var(--card-alt); }
.category-item.active { background: var(--card-alt); }

.cat-icon {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: #3a3a3e;
  color: var(--text-dim);
}
.cat-icon svg { width: 15px; height: 15px; }
.all-icon { background: #3a3a3e; color: var(--text-dim); }
.add-icon { background: var(--card-alt); color: var(--text-faint); font-size: 16px; font-weight: 300; }

.cat-name {
  flex: 1;
  font-size: 13.5px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cat-badge {
  font-size: 11px;
  font-weight: 600;
  color: white;
  border-radius: 50%;
  min-width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
}

.add-category .cat-name { color: var(--text-faint); }

.history-link {
  color: var(--text-faint);
  font-size: 13px;
  padding: 6px 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
}
.history-link:hover { color: var(--text-dim); }
.hist-icon { font-size: 13px; }

/* ===================== MAIN ===================== */

.main {
  flex: 1;
  padding: 28px 40px;
  max-width: 980px;
}

.main-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 18px;
  flex-wrap: wrap;
  gap: 12px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.header-left h1 {
  font-size: 22px;
  font-weight: 700;
  margin: 0;
  text-transform: capitalize;
}

.today-badge {
  background: var(--accent);
  color: white;
  font-size: 11.5px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 20px;
}

.filter-badge {
  background: var(--card-alt);
  color: var(--text-dim);
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 20px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.filter-badge span { cursor: pointer; color: var(--text-faint); font-weight: 700; }

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

.btn-primary {
  background: var(--accent);
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: 9px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.15s;
}
.btn-primary:hover { filter: brightness(1.1); }

.btn-secondary {
  background: var(--card-alt);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: 9px;
  font-size: 13px;
  cursor: pointer;
}
.btn-secondary:hover { background: #34343a; }

.progress-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 26px;
}

.progress-label {
  font-size: 12.5px;
  color: var(--text-dim);
  white-space: nowrap;
}

.progress-bar {
  flex: 1;
  max-width: 240px;
  height: 6px;
  background: var(--card-alt);
  border-radius: 4px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 4px;
  transition: width 0.3s ease;
}

.group {
  margin-bottom: 22px;
}

.group-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  color: #e0935a;
}
.group-header .group-icon { display: flex; }
.group-header .group-icon svg { width: 16px; height: 16px; }
.group-title {
  font-weight: 600;
  font-size: 14px;
}
.group-count {
  background: #3a2c20;
  color: #e0935a;
  font-size: 11px;
  font-weight: 700;
  border-radius: 50%;
  min-width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.task-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.task-row {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  transition: background 0.15s;
}
.task-row:hover { background: var(--card-alt); }
.task-row:hover .task-actions { opacity: 1; }

.checkbox {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1.5px solid var(--text-faint);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  font-size: 12px;
  color: white;
  transition: background 0.15s, border-color 0.15s;
}
.checkbox.checked {
  background: #3aa66b;
  border-color: #3aa66b;
}

.task-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.task-title {
  font-size: 14px;
  color: var(--text);
}

.task-row.done .task-title {
  text-decoration: line-through;
  color: var(--text-faint);
}

.task-cat {
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 4px;
}
.task-cat-icon { display: flex; }
.task-cat-icon svg { width: 12px; height: 12px; }

.task-actions {
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity 0.15s;
}

.icon-btn {
  background: var(--card-alt);
  border: 1px solid var(--border);
  color: var(--text-dim);
  width: 28px;
  height: 28px;
  border-radius: 7px;
  cursor: pointer;
  font-size: 12px;
}
.icon-btn:hover { background: #3a3a3e; color: var(--text); }

.empty-state {
  color: var(--text-faint);
  font-size: 13.5px;
  text-align: center;
  padding: 60px 0;
}

/* ===================== MODALS ===================== */

.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  align-items: center;
  justify-content: center;
  z-index: 100;
}
.modal-overlay.open { display: flex; }

.modal {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  width: 360px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.modal h2 {
  margin: 0 0 12px 0;
  font-size: 17px;
}

.modal label {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 10px;
}

.modal input, .modal select {
  background: var(--card-alt);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 9px 10px;
  font-size: 13.5px;
  font-family: var(--font);
}
.modal input[type="color"] {
  padding: 4px;
  height: 36px;
  cursor: pointer;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 18px;
}

/* ===================== RESPONSIVE ===================== */

@media (max-width: 860px) {
  .app { flex-direction: column; }
  .sidebar { width: 100%; flex-direction: row; overflow-x: auto; }
  .calendar-card { display: none; }
  .main { padding: 18px 16px; }
}