/* ===== 基础重置 ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --color-primary: #10b981;
  --color-primary-dark: #059669;
  --color-primary-rgb: 16, 185, 129;
  --color-text: #1f2937;
  --color-text-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-bg: #f9fafb;
  --color-surface: #ffffff;
  --color-danger: #ef4444;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

/* ===== 5 套主题（通过 data-theme 属性切换，存 localStorage） ===== */
/* 默认（无 data-theme）即为薄荷绿 */
[data-theme="mint"] {
  --color-primary: #10b981;
  --color-primary-dark: #059669;
  --color-primary-rgb: 16, 185, 129;
}
[data-theme="pink"] {
  --color-primary: #ec4899;
  --color-primary-dark: #db2777;
  --color-primary-rgb: 236, 72, 153;
}
[data-theme="blue"] {
  --color-primary: #3b82f6;
  --color-primary-dark: #2563eb;
  --color-primary-rgb: 59, 130, 246;
}
[data-theme="sunset"] {
  --color-primary: #f59e0b;
  --color-primary-dark: #d97706;
  --color-primary-rgb: 245, 158, 11;
}
[data-theme="dark"] {
  --color-primary: #10b981;
  --color-primary-dark: #059669;
  --color-primary-rgb: 16, 185, 129;
  --color-text: #f9fafb;
  --color-text-muted: #9ca3af;
  --color-border: #374151;
  --color-bg: #111827;
  --color-surface: #1f2937;
}

/* 主题切换平滑过渡 */
body,
.topbar,
.todo,
.composer__input,
.composer__btn,
.btn--primary,
.btn,
.field__input {
  transition: background 0.3s var(--ease), color 0.3s var(--ease),
    border-color 0.3s var(--ease);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Helvetica Neue", Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

button {
  font: inherit;
  cursor: pointer;
}

input {
  font: inherit;
}

/* ===== 顶栏 ===== */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 16px 20px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 10;
  padding-top: calc(16px + var(--safe-top));
  padding-bottom: 16px;
  /* 防止子元素溢出导致横向滚动条 */
  min-width: 0;
}

.topbar__title {
  font-weight: 600;
  font-size: 18px;
  white-space: nowrap;
  flex-shrink: 0;
}

.topbar__right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  min-width: 0;
}

.topbar__me {
  color: var(--color-text-muted);
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  /* 超长用户名在窄屏下省略 */
  max-width: 96px;
  overflow: hidden;
  white-space: nowrap;
}

.topbar__me-name {
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 顶栏头像（当前登录用户） */
.topbar__avatar {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  background: var(--color-border);
  box-shadow: 0 0 0 2px var(--color-surface),
    0 0 0 3px rgba(var(--color-primary-rgb), 0.35);
}

/* 加载占位时的状态点（未渲染真实头像前显示） */
.topbar__me--placeholder::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #d1d5db;
  box-shadow: 0 0 0 3px rgba(209, 213, 219, 0.3);
  flex-shrink: 0;
}

/* 窄屏适配：缩小间距、紧凑布局 */
@media (max-width: 400px) {
  .topbar {
    padding: 12px 12px;
    padding-top: calc(12px + var(--safe-top));
  }
  .topbar__title {
    font-size: 16px;
  }
  .topbar__right {
    gap: 6px;
  }
  .topbar__me {
    max-width: 70px;
    font-size: 12px;
  }
  .topbar__avatar {
    width: 22px;
    height: 22px;
  }
  .btn--ghost {
    padding: 6px 10px;
    font-size: 13px;
  }
  .topbar__counter {
    padding: 3px 8px;
    font-size: 12px;
  }
}

/* ===== 按钮 ===== */
.btn {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  padding: 6px 14px;
  border-radius: 8px;
  transition: background 0.15s, border-color 0.15s;
}

.btn:hover {
  background: var(--color-bg);
}

.btn--ghost {
  background: transparent;
}

.btn--primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.btn--primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

/* ===== 主容器 ===== */
.container {
  max-width: 640px;
  margin: 0 auto;
  padding: 20px 16px calc(40px + var(--safe-bottom));
}

/* ===== 离线提示 ===== */
.offline-bar {
  background: #fef3c7;
  border: 1px solid #fde68a;
  color: #92400e;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 13px;
  text-align: center;
  margin-bottom: 12px;
}

/* ===== 输入区 ===== */
.composer {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
}

.composer__input {
  flex: 1;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  outline: none;
}

.composer__input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.15);
}

.composer__btn {
  width: 44px;
  height: 44px;
  border: none;
  background: var(--color-primary);
  color: #fff;
  font-size: 22px;
  line-height: 1;
  border-radius: var(--radius);
}

.composer__btn:hover {
  background: var(--color-primary-dark);
}

.composer__btn:disabled,
.composer__input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ===== 列表 ===== */
.todo-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.todo-list__empty {
  text-align: center;
  color: var(--color-text-muted);
  padding: 60px 16px;
}

.todo-list__empty-emoji {
  font-size: 48px;
  line-height: 1;
  margin-bottom: 12px;
  opacity: 0.7;
}

.todo-list__empty-text {
  font-size: 14px;
}

/* ===== 单条待办 ===== */
.todo {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px 14px;
  margin-bottom: 10px;
  box-shadow: var(--shadow);
  transition: background 0.2s var(--ease), opacity 0.2s var(--ease),
    transform 0.2s var(--ease), box-shadow 0.2s var(--ease),
    border-color 0.2s var(--ease);
  animation: todo-enter 0.25s var(--ease);
}

@media (hover: hover) {
  .todo:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
  }
}

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

.todo--leaving {
  opacity: 0;
  transform: translateX(20px);
}

.todo--done {
  background: #f3f4f6;
  opacity: 0.72;
}

.todo__checkbox {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  margin-top: 2px;
  cursor: pointer;
  accent-color: var(--color-primary);
  flex-shrink: 0;
  transition: transform 0.15s var(--ease);
}

.todo__checkbox:checked {
  transform: scale(1.1);
}

.todo__body {
  flex: 1;
  min-width: 0;
}

.todo__text {
  font-size: 16px;
  color: var(--color-text);
  word-break: break-word;
  line-height: 1.4;
}

.todo--done .todo__text {
  text-decoration: line-through;
  color: var(--color-text-muted);
}

.todo__meta {
  margin-top: 4px;
  font-size: 12px;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 5px;
  flex-wrap: wrap;
}

/* 待办项 meta 中的小头像（创建者） */
.todo__avatar {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  background: var(--color-border);
  vertical-align: middle;
}

/* 无头像时的占位点 */
.todo__avatar-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
  opacity: 0.6;
  flex-shrink: 0;
  display: inline-block;
}

.todo__delete {
  flex-shrink: 0;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  font-size: 16px;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  transition: background 0.15s, color 0.15s;
}

.todo__delete:hover {
  background: #fef2f2;
  color: var(--color-danger);
}

/* ===== Toast 提示 ===== */
.toast {
  position: fixed;
  left: 50%;
  bottom: 30px;
  transform: translateX(-50%) translateY(20px);
  background: rgba(31, 41, 55, 0.92);
  color: #fff;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 14px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 100;
  max-width: 80vw;
}

.toast--show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ===== 骨架屏（首屏加载占位） ===== */
.skeleton {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px 14px;
  margin-bottom: 10px;
  box-shadow: var(--shadow);
}

.skeleton__box {
  background: linear-gradient(
    90deg,
    #f3f4f6 0%,
    #e5e7eb 50%,
    #f3f4f6 100%
  );
  background-size: 200% 100%;
  animation: shimmer 1.4s ease-in-out infinite;
  border-radius: 6px;
}

.skeleton__checkbox {
  width: 22px;
  height: 22px;
  border-radius: 4px;
  flex-shrink: 0;
  margin-top: 2px;
}

.skeleton__line {
  height: 12px;
  margin-bottom: 8px;
}

.skeleton__line--w70 {
  width: 70%;
}

.skeleton__line--w40 {
  width: 40%;
}

@keyframes shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* ===== 顶部加载进度条（同步操作时） ===== */
.loading-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: var(--color-primary);
  z-index: 200;
  transition: width 0.3s var(--ease), opacity 0.3s;
  box-shadow: 0 0 8px rgba(var(--color-primary-rgb), 0.5);
}

.loading-bar--active {
  width: 70%;
  opacity: 1;
}

.loading-bar--done {
  width: 100%;
  opacity: 0;
  transition: width 0.2s, opacity 0.4s 0.1s;
}

/* ===== 输入框旋转加载图标 ===== */
.composer__btn--loading {
  position: relative;
  color: transparent;
}

.composer__btn--loading::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 18px;
  height: 18px;
  margin: -9px 0 0 -9px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ===== 主题选择器 ===== */
.theme-picker {
  position: relative;
}

.theme-picker__btn {
  width: 28px;
  height: 28px;
  padding: 0;
  border: 2px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-primary);
  cursor: pointer;
  transition: transform 0.15s var(--ease), border-color 0.15s;
  box-shadow: 0 0 0 2px var(--color-surface) inset;
}

.theme-picker__btn:hover {
  transform: scale(1.1);
}

.theme-picker__menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 12px;
  box-shadow: var(--shadow-md);
  z-index: 50;
  min-width: 180px;
  animation: menu-enter 0.2s var(--ease);
}

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

.theme-picker__title {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.theme-picker__opts {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}

.theme-picker__opt {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  background: var(--c);
  cursor: pointer;
  padding: 0;
  transition: transform 0.15s var(--ease);
  position: relative;
}

.theme-picker__opt:hover {
  transform: scale(1.15);
}

.theme-picker__opt--active {
  border-color: var(--color-text);
  border-width: 3px;
}

.theme-picker__divider {
  height: 1px;
  background: var(--color-border);
  margin: 8px 0;
}

.theme-picker__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--color-text);
  cursor: pointer;
  user-select: none;
}

.theme-picker__switch {
  position: relative;
  width: 36px;
  height: 20px;
  background: var(--color-border);
  border-radius: 10px;
  transition: background 0.2s;
}

.theme-picker__switch::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  background: #fff;
  border-radius: 50%;
  transition: transform 0.2s var(--ease);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.theme-picker__switch--on {
  background: var(--color-primary);
}

.theme-picker__switch--on::after {
  transform: translateX(16px);
}

/* ===== 完成计数器 ===== */
.topbar__counter {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 12px;
  background: rgba(var(--color-primary-rgb), 0.12);
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}