/* ── Reset & Base ─────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #f7f8fa;
  --color-surface: #ffffff;
  --color-border: #ebeef2;
  --color-text: #2c3e50;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #c0c8d2;
  --color-accent: #75dac7;
  --color-accent-hover: #5cc4b0;
  --color-accent-light: rgba(117, 218, 199, 0.12);
  --color-completed: #75dac7;
  --color-abandoned: #c4a87a;
  --color-danger: #e07070;
  --color-danger-hover: #c95a5a;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
  --transition: 0.18s ease;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Helvetica Neue", sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ── App Container ────────────────────────────────── */
#app {
  max-width: 980px;
  margin: 0 auto;
  padding: 32px 28px 80px;
}

/* ── Header ───────────────────────────────────────── */
.app-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 28px;
}

.app-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.task-count {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  font-weight: 400;
}

/* ── Auto Save ────────────────────────────────────── */
.auto-save-group {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.auto-save-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  user-select: none;
}

.auto-save-seconds {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--color-accent);
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  transition: background var(--transition);
  user-select: none;
}

.auto-save-seconds:hover {
  background: var(--color-accent-light);
}

.auto-save-toggle {
  display: inline-flex;
  cursor: pointer;
}

.auto-save-toggle input {
  display: none;
}

.toggle-track {
  width: 34px;
  height: 20px;
  background: #cdd3da;
  border-radius: 10px;
  position: relative;
  transition: background var(--transition);
}

.toggle-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  background: #fff;
  border-radius: 50%;
  transition: transform var(--transition);
  box-shadow: 0 1px 2px rgba(0,0,0,0.15);
}

.auto-save-toggle input:checked + .toggle-track {
  background: var(--color-accent);
}

.auto-save-toggle input:checked + .toggle-track .toggle-thumb {
  transform: translateX(14px);
}

/* ── Create Bar ───────────────────────────────────── */
.create-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 10px 14px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
  margin-bottom: 20px;
}

.create-bar:focus-within {
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
}

.create-input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 0.95rem;
  color: var(--color-text);
  background: transparent;
  line-height: 1.5;
}

.create-input::placeholder {
  color: var(--color-text-muted);
}

/* ── Buttons ──────────────────────────────────────── */
.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: all var(--transition);
  flex-shrink: 0;
}

.btn-icon:hover {
  background: #f1f3f6;
  color: var(--color-text);
}

.btn-icon:active {
  transform: scale(0.94);
}

.btn-confirm {
  color: var(--color-accent);
}

.btn-confirm:hover {
  background: var(--color-accent-light);
  color: var(--color-accent-hover);
}

.btn-add-sub {
  opacity: 0;
  width: 24px;
  height: 24px;
  color: var(--color-accent);
}

.btn-edit {
  opacity: 0;
  width: 24px;
  height: 24px;
}

.btn-menu {
  opacity: 0;
  width: 26px;
  height: 26px;
}

.todo-row:hover .btn-add-sub,
.todo-row:hover .btn-edit,
.todo-row:hover .btn-menu {
  opacity: 1;
}

.btn-add-sub:hover,
.btn-edit:hover,
.btn-menu:hover {
  background: #f1f3f6;
}

/* ── Swipe Wrapper ─────────────────────────────────── */
.todo-row-wrapper {
  position: relative;
  margin-bottom: 1px;
  border-radius: var(--radius-sm);
}

/* 滑动背景层 */
.swipe-bg {
  position: absolute;
  inset: 0;
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  border-radius: var(--radius-sm);
}

.swipe-bg-left {
  display: flex;
  align-items: center;
  padding: 0 24px;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.swipe-bg-right {
  display: flex;
  align-items: stretch;
  margin-left: auto;
}

.swipe-bg-right .swipe-act {
  display: flex;
  align-items: center;
  padding: 0 16px;
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
}

.swipe-act-edit    { background: var(--color-accent); }
.swipe-act-abandon { background: #c4a87a; }
.swipe-act-delete  { background: var(--color-danger); }
.swipe-act-restore { background: var(--color-accent); }
.swipe-act:last-child { border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }

/* 滑动前景层 */
.todo-row-swipe {
  position: relative;
  z-index: 1;
  overflow: hidden;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  transition: transform 0.25s cubic-bezier(0.2, 0, 0, 1);
  will-change: transform;
}

/* ── Todo List ────────────────────────────────────── */
.todo-list {
  list-style: none;
}

.todo-list-wrap {
  min-height: 100px;
}

/* ── Todo Row ─────────────────────────────────────── */
.todo-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
  position: relative;
  min-height: 44px;
}

.todo-row:hover {
  background: #f1f3f6;
}

/* 缩进 */
.todo-row.level-1 {
  padding-left: 42px;
}

.todo-row.level-2 {
  padding-left: 72px;
}

/* 缩进引导线 */
.todo-row.level-1::before,
.todo-row.level-2::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: #cdd3da;
}

.todo-row.level-2::before {
  left: 50px;
}

/* ── Checkbox ─────────────────────────────────────── */
.checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid #cdd3da;
  margin-top: 2px;
  border-radius: 50%;
  cursor: pointer;
  flex-shrink: 0;
  transition: all var(--transition);
  position: relative;
}

.checkbox:hover {
  border-color: var(--color-accent);
}

.checkbox:checked {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.checkbox:checked::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 1px;
  width: 7px;
  height: 11px;
  border: 2px solid #fff;
  border-top: none;
  border-left: none;
  transform: rotate(45deg);
}

/* ── Todo Title ───────────────────────────────────── */
.todo-title {
  flex: 1;
  font-size: 0.925rem;
  color: var(--color-text);
  word-break: break-word;
  min-height: calc(0.925rem * 1.6);
  transition: color var(--transition);
}

.todo-row.completed .todo-title {
  color: var(--color-text-secondary);
}

.todo-row.abandoned .todo-title {
  color: var(--color-text-secondary);
  text-decoration: line-through;
  text-decoration-thickness: 1px;
}

/* ── Todo Time ────────────────────────────────────── */
.todo-time {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  flex-shrink: 0;
  margin-left: auto;
  margin-right: 4px;
}

/* ── Status Badge ─────────────────────────────────── */
.status-badge {
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 500;
  flex-shrink: 0;
  opacity: 0;
  transition: opacity var(--transition);
}

.todo-row.completed .status-badge,
.todo-row.abandoned .status-badge,
.todo-row:hover .status-badge {
  opacity: 1;
}

.status-badge.completed {
  color: #4da08c;
  background: rgba(117, 218, 199, 0.15);
}

.status-badge.abandoned {
  color: #a08860;
  background: rgba(196, 168, 122, 0.15);
}

/* ── Inline Create (子任务添加) ────────────────────── */
.inline-create {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  margin-top: 2px;
}

.inline-create.level-1 {
  padding-left: 42px;
}

.inline-create.level-2 {
  padding-left: 72px;
}

.inline-create-input {
  flex: 1;
  border: none;
  border-bottom: 1.5px solid var(--color-accent);
  outline: none;
  font-size: 0.9rem;
  color: var(--color-text);
  background: transparent;
  padding: 4px 0;
  line-height: 1.4;
}

.inline-create-input::placeholder {
  color: var(--color-text-muted);
}

/* ── Inline Edit (行内编辑) ───────────────────────── */
.inline-edit-wrap {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  flex: 1;
  min-width: 0;
}

.inline-edit-input {
  flex: 1;
  min-width: 0;
  margin: 0;
  border: none;
  box-shadow: 0 1.5px 0 0 var(--color-accent);
  outline: none;
  font-size: 0.925rem;
  color: var(--color-text);
  background: transparent;
  padding: 0;
  line-height: inherit;
  font-family: inherit;
  resize: none;
  overflow: hidden;
  overflow-wrap: break-word;
  word-break: break-word;
}

.btn-edit-confirm {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  padding-top: 1px;
}

/* ── Empty State ──────────────────────────────────── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 48px 20px;
  color: var(--color-text-secondary);
  text-align: center;
}

.empty-state svg {
  margin-bottom: 16px;
  opacity: 0.6;
}

.empty-state p {
  font-size: 0.9rem;
}

.empty-state.hidden {
  display: none;
}

/* ── Footer ───────────────────────────────────────── */
.app-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  gap: 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 0;
  z-index: 10;
}

.filter-tab {
  padding: 12px 24px;
  border: none;
  background: transparent;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
}

.filter-tab.active {
  color: var(--color-accent);
}

.filter-tab.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 2.5px;
  background: var(--color-accent);
  border-radius: 2px;
}

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

.filter-tab.active:hover {
  color: var(--color-accent);
}

/* ── Popup Menu ───────────────────────────────────── */
.popup-menu {
  position: absolute;
  right: 12px;
  top: 100%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 6px;
  z-index: 20;
  min-width: 130px;
  display: none;
}

.popup-menu.show {
  display: block;
  animation: fadeIn 0.12s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.popup-menu-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 8px 12px;
  border: none;
  background: transparent;
  font-size: 0.84rem;
  color: var(--color-text);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
  white-space: nowrap;
}

.popup-menu-item:hover {
  background: #f1f3f6;
}

.popup-menu-item.danger {
  color: var(--color-danger);
}

.popup-menu-item.danger:hover {
  background: #fef0f0;
}

.popup-divider {
  height: 1px;
  background: var(--color-border);
  margin: 4px 8px;
}

/* ── Scrollbar ────────────────────────────────────── */
::-webkit-scrollbar {
  width: 4px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: #dce0e4;
  border-radius: 2px;
}

/* ── Responsive ───────────────────────────────────── */
/* 平板以下 */
@media (max-width: 768px) {
  #app {
    padding: 16px 10px 100px;
  }

  .app-title {
    font-size: 1.4rem;
  }

  .create-bar {
    padding: 10px 12px;
    margin-bottom: 14px;
  }

  /* 移动端：隐藏桌面 hover 按钮，改用滑动 */
  .btn-add-sub,
  .btn-edit {
    display: none;
  }

  /* 保留菜单按钮，缩小尺寸 */
  .btn-menu {
    opacity: 1;
    width: 28px;
    height: 28px;
    color: var(--color-text-muted);
  }

  /* 移动端行高适配触摸 */
  .todo-row {
    padding: 12px 10px;
    min-height: 48px;
    gap: 10px;
  }

  /* 复选框稍大，方便手指点击 */
  .checkbox {
    width: 22px;
    height: 22px;
    margin-top: 1px;
  }

  /* 缩进 */
  .todo-row.level-1 {
    padding-left: 30px;
  }
  .todo-row.level-2 {
    padding-left: 48px;
  }
  .todo-row.level-1::before { left: 14px; }
  .todo-row.level-2::before { left: 32px; }

  .inline-create.level-1 { padding-left: 30px; }
  .inline-create.level-2 { padding-left: 48px; }

  /* 时间文字更小 */
  .todo-time {
    font-size: 0.7rem;
  }

  /* 状态徽标始终可见 */
  .status-badge {
    opacity: 1;
    font-size: 0.68rem;
    padding: 1px 6px;
  }

  /* 底部筛选全宽 */
  .filter-tab {
    max-width: none;
    padding: 14px 16px;
  }
}

/* 小屏手机优化 */
@media (max-width: 480px) {
  #app {
    padding: 12px 6px 90px;
  }

  .app-title {
    font-size: 1.3rem;
  }

  .app-header {
    margin-bottom: 18px;
    padding: 0 4px;
  }

  .todo-row.level-1 { padding-left: 26px; }
  .todo-row.level-2 { padding-left: 42px; }
  .todo-row.level-1::before { left: 11px; }
  .todo-row.level-2::before { left: 27px; }

  .inline-create.level-1 { padding-left: 26px; }
  .inline-create.level-2 { padding-left: 42px; }

  .swipe-bg-left {
    padding: 0 16px;
    font-size: 0.75rem;
  }
  .swipe-bg-right .swipe-act {
    padding: 0 12px;
    font-size: 0.72rem;
  }
}