/* ===== 整体布局 ===== */
.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* ===== 顶部导航栏 ===== */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 var(--space-xl);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.app-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text-primary);
}

.app-logo i {
  color: var(--color-work);
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-today {
  padding: 6px 14px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-primary);
  transition: background var(--transition-fast);
}

.nav-today:hover {
  background: var(--bg-hover);
}

.nav-title {
  font-size: var(--font-size-md);
  font-weight: 700;
  min-width: 140px;
  text-align: center;
  color: var(--text-primary);
}

.view-switcher {
  display: flex;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  padding: 2px;
}

.view-btn {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.view-btn:hover {
  color: var(--text-primary);
}

.view-btn.active {
  background: var(--bg-secondary);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.header-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

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

.btn-add {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 8px 16px;
  background: var(--color-work);
  color: #fff;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
  transition: all var(--transition-fast);
  box-shadow: 0 2px 8px rgba(74, 144, 217, 0.3);
}

.btn-add:hover {
  background: #3A7BC8;
  box-shadow: 0 4px 12px rgba(74, 144, 217, 0.4);
  transform: translateY(-1px);
}

/* ===== 主体区域 ===== */
.main-body {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ===== 侧边栏 ===== */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow: hidden;
  transition: transform var(--transition-normal), width var(--transition-normal);
}

/* ===== 日历主区域 ===== */
.calendar-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: var(--space-lg);
  padding-top: var(--space-md);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .header {
    padding: 0 var(--space-md);
  }

  .app-logo span {
    display: none;
  }

  .nav-title {
    min-width: 100px;
    font-size: var(--font-size-base);
  }

  .view-switcher {
    display: none;
  }

  .view-switcher-mobile {
    display: flex;
  }

  .sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: 0;
    z-index: 90;
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
    width: 280px;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    top: var(--header-height);
    background: var(--bg-modal-overlay);
    z-index: 89;
  }

  .sidebar-overlay.open {
    display: block;
  }

  .calendar-area {
    padding: var(--space-sm);
    padding-top: var(--space-sm);
  }
}

@media (min-width: 769px) {
  .view-switcher-mobile {
    display: none;
  }

  .sidebar-overlay {
    display: none;
  }
}