/* ============================================================
   layout.css — 侧边栏控制台骨架
   .app-shell > (.sidebar + .main-area(.topbar + .page-container))
   ≤768px：侧栏转抽屉（.drawer-open + .drawer-mask）
   ============================================================ */

.app-shell {
  display: flex;
  min-height: 100vh;
  align-items: stretch;
}

/* ---------- 侧边栏 ---------- */
.sidebar {
  width: var(--t-sidebar-w);
  flex-shrink: 0;
  background: var(--t-bg-container);
  border-right: 1px solid var(--t-split);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  transition: width 0.2s ease, background-color 0.25s;
  z-index: 1100;
}
.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  height: var(--t-topbar-h);
  padding: 0 16px;
  border-bottom: 1px solid var(--t-split);
  flex-shrink: 0;
}
.sidebar-brand .brand-logo {
  width: 30px;
  height: 30px;
  border-radius: var(--t-radius);
  background: linear-gradient(135deg, var(--t-primary), var(--t-primary-hover));
  color: var(--t-text-inverse);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
}
.sidebar-brand .brand-name { font-size: 15px; font-weight: 600; white-space: nowrap; }
.sidebar-brand .brand-name small { display: block; font-size: 10px; color: var(--t-text-3); font-weight: 400; line-height: 1.3; }

.sidebar-menu { flex: 1; padding: 10px 8px; overflow-y: auto; }
.menu-group { font-size: 11px; color: var(--t-text-3); padding: 12px 10px 4px; letter-spacing: 1px; }
.menu-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  margin: 2px 0;
  border-radius: var(--t-radius);
  font-size: 14px;
  color: var(--t-text-2);
  cursor: pointer;
  border: none;
  background: none;
  width: 100%;
  font-family: inherit;
  text-align: left;
  transition: color 0.2s, background-color 0.2s;
  white-space: nowrap;
}
.menu-item:hover { color: var(--t-text); background: var(--t-bg-hover); }
.menu-item.active { background: var(--t-primary-bg); color: var(--t-primary); font-weight: 600; }
.menu-item .icon { flex-shrink: 0; }
.menu-item .icon svg { width: 17px; height: 17px; }

/* 折叠态：只留图标 */
.sidebar.collapsed { width: var(--t-sidebar-collapsed-w); }
.sidebar.collapsed .brand-name,
.sidebar.collapsed .menu-label,
.sidebar.collapsed .menu-group { display: none; }
.sidebar.collapsed .sidebar-brand { justify-content: center; padding: 0 8px; }
.sidebar.collapsed .menu-item { justify-content: center; padding: 9px 0; }

/* 折叠按钮（桌面端） */
.collapse-btn {
  margin: 8px;
  flex-shrink: 0;
  color: var(--t-text-3);
}
.collapse-btn svg { width: 16px; height: 16px; }
.collapse-btn:hover { color: var(--t-text); }

/* ---------- 主区 ---------- */
.main-area { flex: 1; min-width: 0; display: flex; flex-direction: column; }

.topbar {
  height: var(--t-topbar-h);
  background: var(--t-bg-container);
  border-bottom: 1px solid var(--t-split);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 20px;
  position: sticky;
  top: 0;
  z-index: 900;
  transition: background-color 0.25s;
}
.topbar .spacer { flex: 1; }
.topbar .icon-btn {
  width: 34px;
  height: 34px;
  border-radius: var(--t-radius);
  border: none;
  background: none;
  color: var(--t-text-2);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: color 0.2s, background-color 0.2s;
  flex-shrink: 0;
}
.topbar .icon-btn:hover { color: var(--t-text); background: var(--t-bg-hover); }
.topbar .icon-btn svg { width: 18px; height: 18px; }
/* 主题图标跟随 html.theme-dark 切换（首帧即正确，不依赖 JS 内联样式） */
#theme-toggle .icon-moon { display: none; }
html.theme-dark #theme-toggle .icon-moon { display: block; }
html.theme-dark #theme-toggle .icon-sun { display: none; }

.topbar-income .seg-btn { padding: 4px 14px; font-size: 13px; }

.page-container { flex: 1; padding: 20px 24px 40px; }

.page { display: none; }
.page.active { display: block; }

/* 页头（标题 + 说明 + 动作） */
.page-header { margin-bottom: 20px; }
.page-header h2 { font-size: 20px; margin-bottom: 4px; }
.page-header .page-desc { font-size: 13px; color: var(--t-text-2); }

/* ---------- 移动端抽屉 ---------- */
.drawer-mask {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 1050;
}
.topbar .hamburger-btn { display: none; }

@media (max-width: 768px) {
  .page-container { padding: 14px 12px 32px; }
  .collapse-btn { display: none; }
  .topbar .hamburger-btn { display: inline-flex; }
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    transform: translateX(-100%);
    width: var(--t-sidebar-w) !important;
    box-shadow: var(--t-shadow-lg);
  }
  .sidebar.drawer-open { transform: translateX(0); }
  .sidebar.drawer-open .brand-name,
  .sidebar.drawer-open .menu-label,
  .sidebar.drawer-open .menu-group { display: block; }
  .sidebar.drawer-open .menu-item { justify-content: flex-start; padding: 8px 10px; }
  .drawer-mask.show { display: block; }
  .topbar { padding: 0 12px; }
  .topbar-income { margin-left: auto; }
  .income-sub { display: none; }
}