/* ============================================================
   布局样式 (Layout) — 三栏结构
   计划分解器 · UI Designer
   ============================================================ */

/* ---------- 顶部标题栏 ---------- */
.topbar {
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-6);
  background-color: var(--color-surface-2);
  border-bottom: 2px solid var(--color-border-strong);
  position: sticky;
  top: 0;
  z-index: 20;
}

.topbar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.topbar__logo {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background-color: var(--color-primary-400);
  color: #fff;
  font-size: var(--font-size-lg);
  border: 2px solid var(--color-text);
  box-shadow: var(--shadow-sm);
}

.topbar__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.02em;
  color: var(--color-text);
}

.topbar__actions {
  display: flex;
  gap: var(--space-2);
}

/* 顶部栏：计划标签页切换器 */
.topbar__plan {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: var(--space-1);
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0 var(--space-3);
  -ms-overflow-style: none;
  scrollbar-width: none;
}
.topbar__plan::-webkit-scrollbar { display: none; }

.plan-tab {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  border: 2px solid transparent;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background 0.15s, border-color 0.15s, color 0.15s, box-shadow 0.15s;
}
.plan-tab:hover {
  background: var(--color-surface-3);
  box-shadow: var(--shadow-sm);
}
.plan-tab--active {
  background: var(--color-primary-200);
  border-color: var(--color-primary-400);
  color: var(--color-text);
  box-shadow: var(--shadow-hard);
}
.plan-tab__title {
  max-width: 100px;
  overflow: hidden;
  text-overflow: ellipsis;
}
.plan-tab__badge {
  font-size: 10px;
  padding: 1px 4px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-400);
  color: #fff;
}
.plan-tabs__empty {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* 标签页上的删除按钮（悬停才显示） */
.plan-tab__del {
  display: none;
  width: 16px;
  height: 16px;
  line-height: 14px;
  text-align: center;
  font-size: 12px;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-muted);
  border-radius: 50%;
  margin-left: 2px;
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.15s, color 0.15s;
}
.plan-tab:hover .plan-tab__del { display: inline-block; }
.plan-tab__del:hover { background: var(--color-error); color: #fff; }

/* ⋯更多按钮 */
.plan-tab--more {
  padding: 4px 10px;
  font-weight: var(--font-weight-bold);
  letter-spacing: 1px;
  outline: none;
}
.plan-tab--more:focus-visible {
  outline: 2px solid var(--color-primary-400);
  outline-offset: 1px;
}
.plan-tab--more:hover { box-shadow: var(--shadow-sm); }

/* 下拉菜单容器 */
.plan-tabs__more {
  position: relative;
  display: inline-block;
  flex-shrink: 0;
  isolation: isolate; /* 防止子元素 z-index 影响父容器布局 */
}

/* 下拉菜单列表（雾蓝粉卡通风格） */
.plan-dropdown {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  z-index: 1000;
  min-width: 180px;
  max-width: 260px;
  list-style: none;
  margin: 0;
  padding: 4px;
  background: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-hard);
}
.plan-dropdown__item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  font-size: var(--font-size-xs);
  color: var(--color-text);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.12s;
}
.plan-dropdown__item:hover { background: var(--color-surface-2); }
.plan-dropdown__item--active {
  font-weight: var(--font-weight-bold);
  background: var(--color-primary-100);
  color: var(--color-primary-600);
}
.plan-dropdown__badge {
  font-size: 10px;
  padding: 1px 4px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-300);
  color: var(--color-text);
  margin-left: auto;
}
.plan-dropdown__del {
  font-size: 12px;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-muted);
  padding: 0 4px;
  border-radius: 50%;
  cursor: pointer;
  line-height: 1;
  flex-shrink: 0;
}
.plan-dropdown__del:hover { background: var(--color-error); color: #fff; }

/* ---------- 主区域：三栏布局（独立卡片 + 间距，可拖拽调节）---------- */
.layout {
  display: flex;
  align-items: stretch;
  gap: var(--space-2);
  padding: var(--space-3);
  height: calc(100vh - var(--topbar-height) - var(--space-6));
  overflow: hidden;
}

/* ---------- 面板通用：实色大色块 + 粗边框 + 卡通硬阴影 ---------- */
.panel {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background-color: var(--color-surface);
  background-image: var(--linen-texture);
  border: 2px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

/* 侧栏面板默认固定宽，中间面板弹性填充；具体宽度由 JS 按 store 注入 */
.panel[data-panel="task"],
.panel[data-panel="detail"] {
  flex: 0 0 340px;
  min-width: 0;
}
.panel[data-panel="calendar"] {
  flex: 1 1 0;
  min-width: 0;
}

.panel__header {
  flex: 0 0 auto;
  padding: var(--space-4);
  border-bottom: 2px dashed var(--color-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  background-color: var(--color-surface-2);
}
.panel__head-row {
  display: flex;
  align-items: center;
  width: 100%;
  gap: var(--space-3);
}
/* 左/右面板：标题靠左 */
.panel__header:not(.calendar-header) .panel__head-row {
  justify-content: flex-start;
}
/* 日历面板：导航靠左、日期靠右 */
.calendar-header__row {
  justify-content: space-between;
}

.panel__title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

.panel__body {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding: var(--space-4);
}
.panel__body::-webkit-scrollbar {
  width: 8px;
}
.panel__body::-webkit-scrollbar-thumb {
  background-color: var(--color-border-strong);
  border-radius: var(--radius-full);
}
.panel__body::-webkit-scrollbar-track {
  background: transparent;
}

/* ---------- 面板间分隔区：宽度调节（<||> 抓取提示）---------- */
.resizer {
  flex: 0 0 16px;
  width: 16px;
  cursor: col-resize;
  position: relative;
  background-color: transparent;
  touch-action: none;
  z-index: 6;
  transition: background-color var(--transition-fast);
}
.resizer:hover,
.resizer.is-active {
  background-color: var(--color-surface-2);
  border-radius: var(--radius-full);
  border: 2px dashed var(--color-border);
}
/* <||> 抓取提示 */
.resizer__grip {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  align-items: center;
  gap: 4px;
  height: 34px;
  padding: 0 4px;
  border-radius: var(--radius-full);
}
.resizer__grip i {
  display: block;
  width: 4px;
  height: 26px;
  border-radius: 4px;
  background-color: var(--color-text-subtle);
  border: 1px solid var(--color-text);
  transition: background-color var(--transition-fast), height var(--transition-fast);
}
.resizer:hover .resizer__grip i,
.resizer.is-active .resizer__grip i {
  background-color: var(--color-primary-400);
  height: 30px;
}
body.is-resizing {
  cursor: col-resize;
  user-select: none;
}

/* ---------- 面板拖拽手柄：顶部居中、横排三个彩色小圆点 ---------- */
.panel__grip {
  display: inline-flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 4px 10px;
  border: none;
  background: transparent;
  cursor: grab;
  border-radius: var(--radius-md);
  flex: 0 0 auto;
  touch-action: none;
}
.panel__grip:hover {
  background-color: var(--color-surface-3);
}
.panel__grip:focus-visible {
  outline: 3px solid var(--color-primary-400);
  outline-offset: 3px;
}
.panel__grip:active {
  cursor: grabbing;
}
.panel__grip-dot {
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  border: 1px solid var(--color-text);
}
.panel__grip-dot:nth-child(1) { background-color: var(--color-primary-400); }
.panel__grip-dot:nth-child(2) { background-color: var(--color-primary-200); }
.panel__grip-dot:nth-child(3) { background-color: var(--color-primary-300); }

/* ---------- 面板拖拽换位状态 ---------- */
.panel.is-dragging {
  opacity: 0.95;
  box-shadow: var(--shadow-lg);
  z-index: 5;
  cursor: grabbing;
  transform: rotate(1deg);
}
.panel.is-drop-target {
  outline: 3px dashed var(--color-primary-400);
  outline-offset: -6px;
  background-color: var(--color-surface-3);
}
.panel.is-resizing-panel {
  box-shadow: var(--shadow-lg);
}
body.is-reordering {
  user-select: none;
  cursor: grabbing;
}

.calendar-header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* ---------- 日历主体 ---------- */
.calendar-body {
  padding: 0;
  position: relative;
  overflow-y: auto;
}

/* ---------- 响应式：窄屏自动堆叠 ---------- */
@media (max-width: 768px) {
  .topbar {
    flex-wrap: wrap;
    height: auto;
    padding: var(--space-3) var(--space-4);
    row-gap: var(--space-2);
  }
  .topbar__plan {
    order: 3;
    flex-basis: 100%;
    padding: 4px 0;
    justify-content: flex-start;
  }
  .topbar__actions {
    margin-left: auto;
  }
  .layout {
    flex-direction: column;
    height: auto;
    overflow: visible;
    gap: var(--space-2);
  }
  .panel[data-panel] {
    width: 100%;
    flex: 1 1 auto;
  }
  .panel[data-panel="calendar"] {
    min-height: 70vh;
  }
  .resizer {
    display: none;
  }
}

/* 超窄屏：收起品牌标题，仅留 logo + 操作 */
@media (max-width: 420px) {
  .topbar__title {
    display: none;
  }
  .topbar__plan {
    font-size: var(--font-size-xs);
  }
}