:root {
  color-scheme: light;
  --bg: #ffffff;
  --card: #ffffff;
  --ink: #111111;
  --muted: #4a4a4a;
  --accent: #111111;
  --accent-dark: #000000;
  --border: #141414;
  --shadow: none;
  --surface: #f6f6f6;
  --surface-strong: #eeeeee;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Avenir Next", "PingFang SC", "Microsoft Yahei", sans-serif;
  background: var(--bg);
  color: var(--ink);
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 40px 20px 80px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

.header h1 {
  margin: 0 0 8px;
  font-size: 2.4rem;
}

.header p {
  margin: 0;
  color: var(--muted);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 24px;
  box-shadow: var(--shadow);
}

.archived {
  padding: 8px 24px 16px;
}

details {
  border-radius: 14px;
}

summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 0;
  font-weight: 700;
}

summary::-webkit-details-marker {
  display: none;
}

.count {
  background: var(--surface-strong);
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.85rem;
}

.task-form {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: flex-end;
}

.field {
  flex: 1 1 320px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-weight: 600;
}

.field input {
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  font-size: 1rem;
}

.field textarea {
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  font-size: 1rem;
  resize: vertical;
  min-height: 64px;
  font-family: inherit;
}

.primary {
  background: white;
  color: var(--ink);
  border: 1px solid var(--border);
  padding: 12px 20px;
  border-radius: 12px;
  font-size: 1rem;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease;
}

.primary:hover {
  background: var(--surface);
  transform: translateY(-1px);
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 12px;
}

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

.filter {
  border: 1px solid var(--border);
  background: transparent;
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
  color: var(--muted);
  transition: all 0.15s ease;
}

.filter.active {
  border-color: var(--border);
  color: var(--ink);
  background: var(--surface);
}

.task-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.task-item {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 12px;
  padding: 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  align-items: center;
  background: var(--surface);
}

.task-item.expanded {
  grid-template-columns: 1fr;
}

.task-item.expanded .task-meta {
  justify-content: flex-start;
  flex-wrap: wrap;
}

.task-details {
  display: none;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

.task-details strong {
  color: var(--ink);
}

.task-details .detail-row {
  margin-bottom: 6px;
}

.task-details textarea {
  width: 100%;
  min-height: 80px;
  margin-top: 6px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-family: inherit;
  font-size: 0.95rem;
  resize: vertical;
}

.task-item.expanded .task-details {
  display: block;
}

.task-item.dragging {
  opacity: 0.5;
  border-style: dashed;
}

.task-item.drag-over {
  border-color: var(--border);
  box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.06);
}

.task-item[draggable="true"] {
  cursor: grab;
}

.task-item[draggable="true"]:active {
  cursor: grabbing;
}

.task-title {
  font-size: 1rem;
  font-weight: 600;
}

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

.status {
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
}

.status.pending {
  background: var(--surface);
  color: #111111;
}

.status.done {
  background: var(--surface-strong);
  color: #111111;
}

.status.suspended {
  background: var(--surface);
  color: #111111;
}

.status.archived {
  background: var(--surface-strong);
  color: #111111;
}

.select {
  border-radius: 10px;
  border: 1px solid var(--border);
  padding: 6px 10px;
  background: white;
}

.delete {
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.delete:hover {
  color: var(--ink);
}

.empty {
  margin-top: 16px;
  color: var(--muted);
}

@media (max-width: 720px) {
  .task-item {
    grid-template-columns: 1fr;
    align-items: flex-start;
  }

  .task-meta {
    flex-wrap: wrap;
  }
}