/* =================================================================== */
/* 3. 层级菜单系统 (Menu System L1 - L4)                                */
/* =================================================================== */

.custom-accordion .accordion-item {
  border: none;
}

.custom-accordion .accordion-body {
  padding: 0;
}

.custom-accordion .accordion-button:focus {
  box-shadow: none;
  text-shadow: none !important; 
  -webkit-font-smoothing: antialiased; 
  font-weight: 600 !important;
}

/* --- Level 1: 一级菜单 --- */
.custom-accordion > .accordion-item > .accordion-header > .accordion-button {
  padding: var(--menu-padding-y) var(--menu-padding-x);
  font-size: var(--menu-font-size);
  font-weight: 600;
  color: var(--menu-text-color);
  background-color: var(--menu-bg);
  border-top: 1px solid var(--menu-border-color);
  background-image: none;
  transition: none;
}

.custom-accordion > .accordion-item:first-of-type > .accordion-header > .accordion-button {
  border-top: none;
}

.custom-accordion > .accordion-item > .accordion-header > .accordion-button:not(.collapsed) {
  background-color: var(--menu-open-bg);
}

.custom-accordion > .accordion-item > .accordion-header > .accordion-button:hover {
  background-color: var(--menu-hover-bg);
}

.custom-accordion > .accordion-item > .accordion-header > .accordion-button::after {
  content: '';
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none'%3e%3cpath d='M2 5 L8 11 L14 5' stroke='%23ffffff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3e%3c/svg%3e");
  width: 1.0em;
  height: 1.0em;
  background-repeat: no-repeat;
  background-size: contain;
  margin-left: auto;
  transition: transform 0.2s ease-in-out;
}

.custom-accordion > .accordion-item > .accordion-header > .accordion-button:not(.collapsed)::after {
  transform: rotate(180deg);
}

[data-theme='isotope-silver'] .custom-accordion > .accordion-item > .accordion-header > .accordion-button::after {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none'%3e%3cpath d='M2 5 L8 11 L14 5' stroke='%231d1d1f' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3e%3c/svg%3e") !important;
}

/* --- Level 2: 二级菜单 --- */
.custom-accordion .accordion-body .accordion-button {
  padding: var(--submenu-btn-padding-y) 1.0rem !important;
  font-size: var(--submenu-btn-font-size) !important;
  background-color: var(--submenu-btn-bg) !important;
  color: var(--submenu-btn-text-color) !important;
  border-top: 1px solid var(--submenu-btn-border-color) !important;
  padding-left: 1.5rem !important;
  font-weight: 500;
}

.custom-accordion .accordion-body .accordion-button:hover,
.custom-accordion .accordion-body .accordion-button:not(.collapsed) {
  background-color: var(--submenu-btn-hover-bg) !important;
}

.custom-accordion .accordion-body .accordion-button::after {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none'%3e%3cpath d='M2 5 L8 11 L14 5' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3e%3c/svg%3e") !important;
  opacity: 0.9;
  transform: scale(0.9);
}

.custom-accordion .accordion-body .accordion-button:not(.collapsed)::after {
  transform: rotate(180deg) scale(0.9);
}

/* --- Level 3: 三级菜单 --- */
.submenu-container {
  margin-bottom: 0;
}

.sub-function-button {
  width: 100% !important;
  display: flex !important;
  justify-content: space-between !important;
  align-items: center;
  padding: var(--sub-submenu-btn-padding-y) var(--sub-submenu-btn-padding-x) !important;
  background-color: var(--sub-submenu-btn-bg) !important;
  border: none !important;
  border-top: 1px solid var(--sub-submenu-btn-border-color) !important;
  color: var(--sub-submenu-btn-text-color) !important;
  font-size: var(--sub-submenu-btn-font-size);
  font-weight: 500;
  padding-left: 2.2rem !important;
  min-height: 32px;
}

.sub-function-button:hover {
  background-color: var(--sub-submenu-btn-hover-bg) !important;
}

.submenu-arrow {
  font-size: 0.7em;
  transition: transform 0.2s ease-in-out;
  opacity: 0.8;
}

.sub-function-button[aria-expanded="true"] .submenu-arrow {
  transform: rotate(90deg);
}

/* --- Level 4: 四级菜单 --- */
.sub-sub-function-button {
  width: 100% !important;
  display: flex !important;
  justify-content: space-between !important;
  align-items: center;
  padding: var(--l4-btn-padding-y) var(--l4-btn-padding-x) !important;
  background-color: var(--l4-btn-bg) !important;
  border: none !important;
  border-top: 1px solid var(--l4-btn-border-color) !important;
  color: var(--l4-btn-text-color) !important;
  font-size: var(--l4-btn-font-size);
  font-weight: 500;
  padding-left: 2.9rem !important;
  min-height: 28px;
}

.sub-sub-function-button:hover {
  background-color: var(--l4-btn-hover-bg) !important;
}

/* =================================================================== */
/* 4. 布局结构与视口隔离 (Layout & Components)                          */
/* =================================================================== */
.app-container {
  height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 0;
  background-color: var(--global-bg-color, #ffffff); 
}

.app-container > .row {
  flex-grow: 1;
  min-height: 0;
  margin: 0;
}

.main-card {
  height: 100% !important;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--global-border-color);
  background-color: var(--global-bg-color, #ffffff); 
  box-shadow: none;
  border-radius: 0 !important;
  margin-bottom: 0 !important;
}

.main-card .card-body {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding-bottom: 0 !important;
  background-color: #ffffff !important; 
}

.main-card-header {
  background-color: var(--menu-bg);
  color: var(--menu-text-color);
  padding: var(--menu-padding-y) var(--menu-padding-x);
  border-bottom: 1px solid var(--menu-border-color);
  border-radius: 0 !important;
}

.card-title-text {
  font-size: 1rem;
  font-weight: bold;
  margin: 0;
  line-height: 1.2;
  text-align: center;
}

.control-panel {
  padding: 0.5rem !important;
  background-color: var(--global-bg-color, #ffffff); 
}

/* =================================================================== */
/* 6. 选项卡与工具栏 (Tabs & Toolbars)                                 */
/* =================================================================== */
.main-content-tabs-container {
  background-color: var(--global-bg-color, #ffffff) !important; 
  border-bottom: 1px solid var(--global-border-color, #d1d5db) !important; 
  padding: 0 0.0rem !important;
  height: 29px !important;
}

.main-content-tabs-container .nav-tabs {
  border-bottom: none;
}

.tabs-fill-width > .nav-tabs {
  display: flex;
  width: 100%;
  height: 100%;
}

.tabs-fill-width .nav-item {
  flex-grow: 1;
  text-align: center;
  display: flex;
}

.tabs-fill-width .nav-link {
  width: 100%;
  height: 100% !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  border: 1px solid transparent !important;
  border-bottom: none !important;
  color: var(--global-text-color) !important;
}

.tabs-fill-width .nav-link.active {
  background-color: var(--global-panel-bg, #f3f4f6) !important;
  color: var(--global-text-color) !important;
  font-weight: 600;
  border-color: var(--global-border-color) !important;
}

.tabs-fill-width .nav-link:not(.active):hover {
  background-color: rgba(0,0,0,0.05);
}

.nav-tabs-sm .nav-link {
  padding: 0.10rem 0.75rem !important;
  font-size: 0.875rem;
  color: var(--global-text-color) !important;
  background-color: transparent;
  border: none !important;
  opacity: 0.7;
  transition: all 0.2s ease-in-out;
  white-space: nowrap;
}

.nav-tabs-sm .nav-link:hover {
  color: var(--menu-text-color) !important;
  opacity: 0.85;
}

.viewer-toolbar {
  background-color: var(--menu-bg);
  color: var(--menu-text-color);
  border-bottom: 1px solid var(--menu-border-color);
  height: 29px;
  padding: 0 var(--menu-padding-x);
  font-size: var(--menu-font-size);
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  transition: background-color 0.2s ease-in-out;
}

.viewer-second-toolbar {
  height: 31px;
  padding: 0 0.0rem;
  background-color: var(--global-bg-color, #ffffff); 
  border-bottom: 1px solid var(--global-border-color, #d1d5db);
}

.viewer-output-container {
  height: 72vh;
  min-height: 400px;
}

#viewer-sticky-container {
  flex-grow: 1;
  height: 0;
  min-height: 0;
}