/* ----------------------------------------------------------- */
/* 1️⃣ Color palette – light & dark themes are swapped in the
   body class via CSS variables. -------------------------------- */
:root {
  --primary: #1976d2;
  --accent: #f5f5f5;
  --bg: #ffffff;
  --text: #212121;
  --text-secondary: #757575;
  --text-muted: #bdbdbd;
  --border: #e0e0e0;
}

body.light {
  --primary: #1976d2;
  --accent: #f5f5f5;
  --bg: #ffffff;
  --text: #212121;
  --text-secondary: #757575;
  --text-muted: #bdbdbd;
  --border: #e0e0e0;
}

body.dark {
  --primary: #90caf9;
  --accent: #424242;
  --bg: #121212;
  --text: #e0e0e0;
  --text-secondary: #bdbdbd;
  --text-muted: #757575;
  --border: #616161;
}

/* ----------------------------------------------------------- */
/* 2️⃣ Global styles ------------------------------------------------ */
html,
body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background 0.3s, color 0.3s;
}
.app {
  max-width: 640px;
  margin: 0 auto;
  padding: 1rem;
}

/* ----------------------------------------------------------- */
/* 3️⃣ Header ------------------------------------------------ */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.app-header h1 {
  margin: 0;
  font-size: 1.8rem;
}
.header-actions button {
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.4rem;
  cursor: pointer;
  margin-left: 0.5rem;
  padding: 0.2rem;
  transition: transform 0.2s;
}
.header-actions button:hover {
  transform: scale(1.1);
}

/* ----------------------------------------------------------- */
/* 4️⃣ Filters & Search --------------------------------------- */
.filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 1rem 0;
}
.filter-btn {
  padding: 0.4rem 0.8rem;
  border: none;
  border-radius: 4px;
  background: var(--accent);
  color: var(--bg);
  cursor: pointer;
}
.filter-btn.active,
.filter-btn:hover {
  background: var(--primary);
  color: var(--bg);
}
#search-input {
  flex: 1;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  color: var(--text);
}

/* ----------------------------------------------------------- */
/* 5️⃣ Task list --------------------------------------------- */
.task-list ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.task-list li {
  background: var(--accent);
  border: 1px solid var(--border);
  border-radius: 4px;
  margin-bottom: 0.8rem;
  padding: 0.8rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: grab;
  transition: background 0.2s;
}
.task-list li.dragging {
  opacity: 0.5;
}
.task-list li.completed .task-title {
  text-decoration: line-through;
  color: var(--text-muted);
}
.task-list li .task-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  margin-right: 1rem;
}
.task-list li .task-title {
  font-weight: 600;
  margin: 0;
}
.task-list li .task-meta {
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.task-list li .task-meta span {
  margin-right: 0.4rem;
}
.task-list li .actions button {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  padding: 0.2rem;
  color: var(--primary);
  transition: color 0.2s;
}
.task-list li .actions button:hover {
  color: var(--text);
}

/* ----------------------------------------------------------- */
/* 6️⃣ Modal ------------------------------------------------- */
.modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.4);
}
.modal.hidden {
  display: none;
}
.modal-content {
  background: var(--bg);
  color: var(--text);
  padding: 1.5rem;
  border-radius: 6px;
  width: 90%;
  max-width: 420px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.modal-content h2 {
  margin-top: 0;
  margin-bottom: 1rem;
}
.modal-content label {
  display: flex;
  flex-direction: column;
  margin-bottom: 1rem;
}
.modal-content input,
.modal-content textarea,
.modal-content select {
  margin-top: 0.4rem;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
  color: var(--text);
}
.modal-buttons {
  display: flex;
  justify-content: flex-end;
  gap: 0.8rem;
}
.modal-buttons button {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}
#save-task-btn {
  background: var(--primary);
  color: var(--bg);
}
#cancel-task-btn {
  background: var(--accent);
  color: var(--text);
}

/* ----------------------------------------------------------- */
/* 7️⃣ Utility ------------------------------------------------ */
.required {
  color: #d32f2f;
}