/* ========================================
   Base Styles - Refined
   ======================================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    font-feature-settings: "kern" 1, "liga" 1;
    overflow-x: hidden;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-body);
    line-height: var(--leading-body);
    background-color: var(--color-bg-base);
    color: var(--color-text-primary);
    letter-spacing: var(--tracking-normal);
    overflow-x: hidden;
}

/* ===== Focus States ===== */
:focus {
    outline: none;
}

:focus-visible {
    outline: 2px solid var(--color-conceptual);
    outline-offset: 2px;
    border-radius: var(--radius-xs);
}

/* ===== Skip Link ===== */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-4);
    padding: var(--space-2) var(--space-4);
    background: var(--color-bg-elevated);
    color: var(--color-text-primary);
    border-radius: var(--radius-md);
    z-index: 1000;
    transition: top var(--duration-fast) var(--ease-out);
}

.skip-link:focus {
    top: var(--space-4);
}

/* ========================================
   Utility Classes
   ======================================== */

/* Flex utilities */
.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-row {
    display: flex;
    align-items: center;
}

.flex-col {
    display: flex;
    flex-direction: column;
}

/* Gap utilities */
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }

/* Interactive element base (cursor + transition) */
.interactive {
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
}

/* Text truncation */
.truncate {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Section label styling (uppercase muted headers) */
.section-label {
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: var(--tracking-widest);
    color: var(--color-text-muted);
}

/* Icon size utilities */
.icon-xs { width: var(--icon-xs); height: var(--icon-xs); }
.icon-sm { width: var(--icon-sm); height: var(--icon-sm); }
.icon-md { width: var(--icon-md); height: var(--icon-md); }
.icon-lg { width: var(--icon-lg); height: var(--icon-lg); }
.icon-xl { width: var(--icon-xl); height: var(--icon-xl); }

/* Layer color modifiers - consolidated (using solid borders for consistency) */
.layer-conceptual {
    --layer-color: var(--color-conceptual);
    --layer-bg: var(--color-conceptual-bg);
}
.layer-logical {
    --layer-color: var(--color-logical);
    --layer-bg: var(--color-logical-bg);
}
.layer-physical {
    --layer-color: var(--color-physical);
    --layer-bg: var(--color-physical-bg);
}

/* Status color modifiers - consolidated */
.status-active { --status-color: var(--color-logical); --status-bg: var(--color-logical-bg); }
.status-draft { --status-color: var(--color-physical); --status-bg: var(--color-physical-bg); }
.status-deprecated { --status-color: var(--color-text-muted); --status-bg: var(--color-bg-hover); }
.status-archived { --status-color: var(--color-text-muted); --status-bg: var(--color-bg-hover); }

/* ========================================
   Layout
   ======================================== */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background: var(--color-bg-base);
}

.main-layout {
    display: flex;
    flex: 1;
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
}

/* ===== Form Control Base Styles ===== */
.form-control,
.setting-input,
.select,
.version-selector,
.setting-select,
.dropdown-trigger,
.group-by-trigger {
    height: 32px;
    padding: var(--space-2) var(--space-3);
    background: var(--color-bg-base);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-family: var(--font-sans);
    font-size: var(--text-small);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
}

.form-control:hover:not(:disabled),
.setting-input:hover:not(:disabled),
.select:hover,
.version-selector:hover,
.setting-select:hover:not(:disabled),
.dropdown-trigger:hover,
.group-by-trigger:hover {
    border-color: var(--color-border-strong);
}

.form-control:focus,
.setting-input:focus,
.select:focus,
.version-selector:focus,
.setting-select:focus,
.dropdown-trigger:focus,
.group-by-trigger:focus {
    outline: none;
    border-color: var(--color-conceptual);
    box-shadow: 0 0 0 2px var(--color-conceptual-bg);
}

.form-control:disabled,
.setting-input:disabled,
.select:disabled,
.setting-select:disabled {
    opacity: var(--opacity-disabled);
    cursor: not-allowed;
}

/* Select-specific styles */
.select,
.version-selector,
.setting-select {
    padding-right: var(--space-6);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
}

.version-selector {
    width: 100%;
    font-weight: var(--font-medium);
}

/* Dropdown trigger flex layout */
.dropdown-trigger,
.group-by-trigger {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* ===== Custom Dropdown ===== */
.dropdown,
.group-by-dropdown {
    position: relative;
}

.dropdown-icon,
.group-by-trigger-icon,
.group-by-option-icon {
    width: 14px;
    height: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dropdown-icon svg,
.group-by-trigger-icon svg,
.group-by-option-icon svg {
    width: var(--icon-sm);
    height: var(--icon-sm);
}

.dropdown-text,
.group-by-trigger-text {
    flex: 1;
}

.dropdown-arrow,
.group-by-trigger-arrow {
    width: 12px;
    height: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--duration-fast) var(--ease-out);
}

.dropdown-arrow svg,
.group-by-trigger-arrow svg {
    width: var(--icon-xs);
    height: var(--icon-xs);
}

.dropdown.open .dropdown-arrow,
.group-by-dropdown.open .group-by-trigger-arrow {
    transform: rotate(180deg);
}

.dropdown-menu,
.group-by-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 160px;
    margin-top: var(--space-1);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 100;
    display: none;
    padding: var(--space-1);
}

.dropdown.open .dropdown-menu,
.group-by-dropdown.open .group-by-menu {
    display: block;
}

.dropdown-option,
.group-by-option {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    width: 100%;
    padding: var(--space-2) var(--space-3);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-family: var(--font-sans);
    font-size: var(--text-small);
    cursor: pointer;
    text-align: left;
    transition: all var(--duration-fast) var(--ease-out);
}

.dropdown-option:hover,
.group-by-option:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
}

.dropdown-option.selected,
.group-by-option.selected {
    background: var(--color-conceptual-bg);
    color: var(--color-conceptual);
}

/* ===== Loading State ===== */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    flex-direction: column;
    gap: var(--space-3);
    color: var(--color-text-muted);
    font-size: var(--text-small);
}

.loading-spinner {
    width: 32px;
    height: 32px;
    border: 2px solid var(--color-border-default);
    border-top-color: var(--color-conceptual);
    border-radius: var(--radius-full);
    animation: spin 0.7s linear infinite;
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(-8px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ========================================
   Header - Clean, Professional Design
   ======================================== */
.header {
    height: var(--header-height);
    background-color: var(--color-bg-surface);
    border-bottom: 1px solid var(--color-border-subtle);
    display: flex;
    align-items: center;
    padding: 0 var(--space-5);
    gap: var(--space-4);
    position: relative;
    z-index: 100;
}

/* Dark header for light theme */
[data-theme="light"] .header {
    background-color: var(--color-header-bg);
    border-bottom: none;
    box-shadow: var(--shadow-sm);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-2-5);
    font-size: var(--text-body);
    font-weight: var(--font-semibold);
    color: var(--color-text-primary);
    letter-spacing: -0.01em;
    text-decoration: none;
    padding: var(--space-1-5) var(--space-2);
    margin-left: calc(var(--space-2) * -1);
    border-radius: var(--radius-md);
    transition: all var(--duration-fast) var(--ease-out);
}

[data-theme="light"] .logo {
    color: var(--color-header-text);
}

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

[data-theme="light"] .logo:hover {
    background-color: rgba(255, 255, 255, 0.08);
}

.logo-icon {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-conceptual);
    background: var(--color-conceptual-bg);
}

[data-theme="light"] .logo-icon {
    background: rgba(79, 142, 247, 0.25);
    color: #7EB3FF;
}

.logo-icon svg {
    width: var(--icon-md);
    height: var(--icon-md);
}

/* Header Branding */
.header-branding {
    display: flex;
    flex-direction: column;
    gap: 0;
    font-size: var(--text-2xs);
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.3;
    margin-left: var(--space-3);
    padding-left: var(--space-3);
    border-left: 1px solid rgba(255, 255, 255, 0.15);
}

.header-branding span {
    white-space: nowrap;
}

@media (max-width: 900px) {
    .header-branding {
        display: none;
    }
}

/* ===== Layer Tabs - Refined ===== */
.layer-tabs {
    display: flex;
    gap: var(--space-0-5);
    background: var(--color-bg-base);
    padding: var(--space-1);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-subtle);
}

[data-theme="light"] .layer-tabs {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.12);
}

.layer-tab {
    padding: var(--space-1-5) var(--space-3);
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    font-family: var(--font-sans);
    font-size: var(--text-caption);
    font-weight: var(--font-medium);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--duration-fast) var(--ease-out);
    letter-spacing: 0.01em;
}

.layer-tab:hover {
    color: var(--color-text-primary);
    background: var(--color-bg-hover);
}

.layer-tab.active {
    background: var(--layer-color);
    color: white;
    font-weight: var(--font-semibold);
    box-shadow: var(--shadow-xs);
}

.layer-tab[data-layer="conceptual"] { --layer-color: var(--color-conceptual); }
.layer-tab[data-layer="logical"] { --layer-color: var(--color-logical); }
.layer-tab[data-layer="physical"] { --layer-color: var(--color-physical); }

.layer-tab[data-layer="logical"].active,
.layer-tab[data-layer="physical"].active {
    color: var(--color-bg-base);
}

/* ===== Expanding Search ===== */
.search-container {
    position: relative;
    display: flex;
    align-items: center;
}

.search-toggle {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--color-text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: all var(--duration-fast) var(--ease-out);
}

.search-toggle:hover {
    color: var(--color-text-primary);
    background: var(--color-bg-hover);
}

.search-toggle svg {
    width: var(--icon-md);
    height: var(--icon-md);
}

.search-container.expanded .search-toggle {
    display: none;
}

.search-wrapper {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    overflow: hidden;
    transition: width var(--duration-normal) var(--ease-out);
}

.search-container.expanded .search-wrapper {
    width: 240px;
}

.search-input {
    width: 100%;
    height: 32px;
    padding: 0 var(--space-3);
    background: var(--color-bg-base);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-family: var(--font-sans);
    font-size: var(--text-small);
    transition: all var(--duration-fast) var(--ease-out);
}

.search-input:hover {
    border-color: var(--color-border-strong);
}

.search-input:focus {
    border-color: var(--color-conceptual);
    box-shadow: 0 0 0 2px var(--color-conceptual-bg);
    outline: none;
}

.search-input::placeholder {
    color: var(--color-text-muted);
}

/* ===== Header Right - Refined ===== */
.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-left: auto;
}

.lang-selector {
    height: 30px;
    padding: 0 var(--space-3);
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-family: var(--font-sans);
    font-size: var(--text-caption);
    font-weight: var(--font-semibold);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
    letter-spacing: 0.02em;
}

.lang-selector:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
}

.lang-selector:focus {
    border-color: var(--color-conceptual);
    outline: none;
    box-shadow: 0 0 0 2px var(--color-conceptual-bg);
}

.lang-selector option {
    background: var(--color-bg-surface);
    color: var(--color-text-primary);
    padding: var(--space-2);
}

[data-theme="light"] .lang-selector option {
    background: white;
    color: #1A1F26;
}

.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
}

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

/* Light theme header controls */
[data-theme="light"] .layer-tab,
[data-theme="light"] .search-toggle,
[data-theme="light"] .lang-selector,
[data-theme="light"] .icon-btn {
    color: var(--color-header-text-secondary);
}

[data-theme="light"] .layer-tab:hover,
[data-theme="light"] .search-toggle:hover,
[data-theme="light"] .lang-selector:hover,
[data-theme="light"] .icon-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-header-text);
}

.icon-btn:active {
    transform: scale(0.95);
}

.icon-btn svg {
    width: var(--icon-md);
    height: var(--icon-md);
}

/* Login Button */
.btn-login {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    height: 30px;
    padding: 0 var(--space-3);
    background: var(--color-conceptual);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-family: var(--font-sans);
    font-size: var(--text-caption);
    font-weight: var(--font-semibold);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
}

.btn-login:hover {
    background: var(--color-conceptual-dark, #7c3aed);
    transform: translateY(-1px);
}

.btn-login:active {
    transform: translateY(0) scale(0.98);
}

.btn-login svg {
    width: var(--icon-sm);
    height: var(--icon-sm);
}

/* ========================================
   Sidebar - Clean, Professional Design
   ======================================== */
.sidebar {
    position: relative;
    width: var(--sidebar-width);
    min-width: var(--sidebar-min-width);
    max-width: var(--sidebar-max-width);
    background: var(--color-bg-surface);
    border-right: 1px solid var(--color-border-subtle);
    display: flex;
    flex-direction: column;
    overflow: visible;
    transition: width var(--duration-slow) var(--ease-in-out);
}

[data-theme="light"] .sidebar {
    box-shadow: 1px 0 0 rgba(0, 0, 0, 0.04);
}

.sidebar.collapsed {
    width: 0;
    min-width: 0;
    border-right: none;
    overflow: visible;
}

.sidebar.collapsed .sidebar-header,
.sidebar.collapsed .tree-container,
.sidebar.collapsed .sidebar-footer {
    opacity: 0;
    visibility: hidden;
}

.sidebar-header {
    padding: var(--space-3);
    border-bottom: 1px solid var(--color-border-subtle);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

/* Sidebar Search */
.sidebar-search {
    position: relative;
    display: flex;
    align-items: center;
}

.sidebar-search-icon {
    position: absolute;
    left: var(--space-2-5);
    display: flex;
    align-items: center;
    color: var(--color-text-muted);
    pointer-events: none;
}

.sidebar-search-icon svg {
    width: var(--icon-sm);
    height: var(--icon-sm);
}

.sidebar-search-input {
    width: 100%;
    height: 32px;
    padding: var(--space-2) var(--space-8) var(--space-2) var(--space-8);
    background: var(--color-bg-base);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-family: var(--font-sans);
    font-size: var(--text-small);
    transition: all var(--duration-fast) var(--ease-out);
}

.sidebar-search-input::placeholder {
    color: var(--color-text-muted);
}

.sidebar-search-input:hover {
    border-color: var(--color-border-strong);
}

.sidebar-search-input:focus {
    outline: none;
    border-color: var(--color-conceptual);
    box-shadow: 0 0 0 2px var(--color-conceptual-bg);
}

.sidebar-search-clear {
    position: absolute;
    right: var(--space-1);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    border-radius: var(--radius-xs);
    opacity: 0;
    visibility: hidden;
    transition: all var(--duration-fast) var(--ease-out);
}

.sidebar-search-clear svg {
    width: var(--icon-sm);
    height: var(--icon-sm);
}

.sidebar-search-input:not(:placeholder-shown) ~ .sidebar-search-clear {
    opacity: 1;
    visibility: visible;
}

.sidebar-search-clear:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
}

/* Sidebar Controls Row */
.sidebar-controls {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.sidebar-controls .group-by-dropdown {
    flex: 1;
    min-width: 0;
}

.sidebar-control-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--color-bg-base);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    flex-shrink: 0;
    transition: all var(--duration-fast) var(--ease-out);
}

.sidebar-control-btn svg {
    width: var(--icon-md);
    height: var(--icon-md);
}

.sidebar-control-btn:hover {
    border-color: var(--color-border-strong);
    color: var(--color-text-primary);
}

.sidebar-control-btn:focus {
    outline: none;
    border-color: var(--color-conceptual);
    box-shadow: 0 0 0 2px var(--color-conceptual-bg);
}

.sidebar-control-btn.active {
    background: var(--color-conceptual-bg);
    border-color: var(--color-conceptual);
    color: var(--color-conceptual);
}

/* Sort Dropdown */
.sort-dropdown {
    position: relative;
}

.sort-menu {
    position: absolute;
    top: calc(100% + var(--space-1));
    right: 0;
    min-width: 140px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition: all var(--duration-fast) var(--ease-out);
    z-index: 100;
}

.sort-dropdown.open .sort-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.sort-option {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    width: 100%;
    padding: var(--space-2) var(--space-3);
    background: transparent;
    border: none;
    color: var(--color-text-secondary);
    font-size: var(--text-small);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
}

.sort-option:first-child {
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.sort-option:last-child {
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.sort-option:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
}

.sort-option.selected {
    background: var(--color-conceptual-bg);
    color: var(--color-conceptual);
}

.sort-option-icon {
    display: flex;
    align-items: center;
}

.sort-option-icon svg {
    width: var(--icon-md);
    height: var(--icon-md);
}

.sidebar-title {
    font-size: var(--text-2xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
}

.sidebar.collapsed .sidebar-title {
    display: none;
}

.sidebar-toggle {
    position: absolute;
    right: -14px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border-default);
    color: var(--color-text-muted);
    cursor: pointer;
    border-radius: var(--radius-full);
    transition: all var(--duration-fast) var(--ease-out);
    z-index: 50;
    box-shadow: var(--shadow-sm);
}

.sidebar-toggle:hover {
    background: var(--color-bg-elevated);
    color: var(--color-text-primary);
    border-color: var(--color-border-strong);
}

.sidebar-toggle svg {
    width: var(--icon-sm);
    height: var(--icon-sm);
    transition: transform var(--duration-fast) var(--ease-out);
}

.sidebar.collapsed .sidebar-toggle svg {
    transform: rotate(180deg);
}

.tree-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-3);
}

.sidebar-footer {
    padding: var(--space-3);
    border-top: 1px solid var(--color-border-subtle);
}

/* ===== Tree Navigation - Refined ===== */
.layer-section {
    margin-bottom: var(--space-2);
}

.layer-section-header {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-2-5);
    font-size: var(--text-caption);
    font-weight: var(--font-semibold);
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--duration-fast) var(--ease-out);
    user-select: none;
    background: transparent;
    letter-spacing: 0.01em;
    color: var(--layer-color);
    border-left: 2px solid var(--layer-color);
}

.layer-section-header.logical { --layer-color: var(--color-logical); }
.layer-section-header.physical { --layer-color: var(--color-physical); }

.layer-section-header:hover {
    background: var(--color-bg-hover);
}

.layer-section-header .layer-toggle {
    width: 14px;
    height: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: inherit;
    opacity: var(--opacity-muted);
    transition: all var(--duration-fast) var(--ease-out);
    flex-shrink: 0;
}

.layer-section-header .layer-toggle svg {
    width: var(--icon-2xs);
    height: var(--icon-2xs);
}

.layer-section-header.collapsed .layer-toggle {
    transform: rotate(-90deg);
}

.layer-section-content {
    padding-left: var(--space-1);
    padding-top: var(--space-1);
}

.layer-section-content.collapsed {
    display: none;
}

/* Tree Empty State - uses shared empty-state base */
.tree-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-8) var(--space-4);
    text-align: center;
    color: var(--color-text-muted);
}

.tree-empty-state .tree-empty-icon {
    display: flex;
    margin-bottom: var(--space-3);
    opacity: var(--opacity-disabled);
}

.tree-empty-state .tree-empty-icon svg {
    width: var(--icon-2xl);
    height: var(--icon-2xl);
}

.tree-empty-state .tree-empty-text {
    font-size: var(--text-small);
}

.tree-section {
    margin-bottom: var(--space-3);
}

.tree-section-header {
    padding: var(--space-1-5) var(--space-2-5);
    font-size: var(--text-2xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-muted);
}

.tree-item {
    user-select: none;
}

.tree-node {
    display: flex;
    align-items: center;
    padding: var(--space-1-5) var(--space-2);
    border-radius: var(--radius-sm);
    cursor: pointer;
    gap: var(--space-1-5);
    transition: all var(--duration-fast) var(--ease-out);
    margin-bottom: var(--space-px);
}

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

.tree-node.selected {
    background: var(--color-bg-active);
    font-weight: var(--font-medium);
}

/* Layer-specific selected states */
.tree-node.selected.logical,
.tree-node.selected.physical {
    background: var(--layer-bg);
    border-left: 2px solid var(--layer-color);
    margin-left: -2px;
    padding-left: calc(var(--space-2) - 2px);
}

.tree-node.logical { --layer-color: var(--color-logical); --layer-bg: var(--color-logical-bg); }
.tree-node.physical { --layer-color: var(--color-physical); --layer-bg: var(--color-physical-bg); }

.tree-toggle {
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    flex-shrink: 0;
    transition: transform var(--duration-fast) var(--ease-out);
    border-radius: var(--radius-xs);
}

.tree-toggle:hover {
    background: var(--color-bg-base);
}

.tree-toggle.expanded {
    transform: rotate(90deg);
}

.tree-toggle svg {
    width: var(--icon-2xs);
    height: var(--icon-2xs);
}

/* ===== Attribute & Column Tree Items ===== */
.tree-attribute .tree-node,
.tree-column .tree-node {
    padding-left: var(--space-3);
    opacity: var(--opacity-secondary);
}

.tree-attribute .tree-node:hover,
.tree-column .tree-node:hover,
.attribute-node:hover,
.column-node:hover {
    opacity: 1;
}

.attribute-node,
.column-node {
    opacity: var(--opacity-secondary);
}

.attribute-node.selected,
.column-node.selected {
    opacity: 1;
    background: var(--color-bg-active);
    font-weight: var(--font-medium);
    border-left: 2px solid var(--color-logical);
    margin-left: -2px;
    padding-left: calc(var(--space-3) - 2px);
}

.column-node.selected {
    border-left-color: var(--color-physical);
}

.column-node {
    cursor: pointer;
}

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

.tree-icon {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
}

.tree-icon svg {
    width: var(--icon-xs);
    height: var(--icon-xs);
}

.tree-node.logical .tree-icon { color: var(--color-logical); }
.tree-node.physical .tree-icon { color: var(--color-physical); }

.tree-label {
    font-size: var(--text-small);
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
    line-height: var(--leading-h1);
}

.tree-count {
    font-size: var(--text-2xs);
    color: var(--color-text-muted);
    padding: var(--space-px) var(--space-1-5);
    background: var(--color-bg-hover);
    border-radius: var(--radius-full);
    font-weight: var(--font-medium);
    min-width: 18px;
    text-align: center;
}

.tree-children {
    margin-left: var(--space-4);
    display: none;
}

.tree-children.expanded {
    display: block;
}

/* ========================================
   Main Content - Refined
   ======================================== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    padding: var(--space-8) var(--space-10);
    gap: var(--space-6);
}

/* ===== Breadcrumb - Refined ===== */
.breadcrumb {
    padding: 0;
    background: transparent;
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-small);
    box-sizing: border-box;
}

.breadcrumb-item {
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: var(--space-1-5) var(--space-2-5);
    border-radius: var(--radius-md);
    transition: all var(--duration-fast) var(--ease-out);
    font-weight: var(--font-medium);
}

.breadcrumb-item:hover {
    color: var(--color-text-primary);
    background: var(--color-bg-hover);
}

.breadcrumb-separator {
    color: var(--color-text-disabled);
    font-size: var(--text-caption);
    padding: 0 var(--space-1);
}

.breadcrumb-current {
    color: var(--color-text-primary);
    font-weight: var(--font-semibold);
    padding: var(--space-1-5) var(--space-2-5);
}

#contentBody {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

/* ===== Entity Header - Refined ===== */
.entity-header {
    margin-bottom: var(--space-2);
}

.entity-badges {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-3);
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: 3px var(--space-2-5);
    border-radius: var(--radius-xs);
    font-size: var(--text-2xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.badge-layer {
    background: var(--layer-color);
    color: white;
}

.badge-layer.logical { --layer-color: var(--color-logical); color: var(--color-bg-base); }
.badge-layer.physical { --layer-color: var(--color-physical); color: var(--color-bg-base); }

.badge-outline {
    background: transparent;
    border: 1px solid var(--color-border-default);
    color: var(--color-text-secondary);
}

.badge-compliance {
    font-weight: var(--font-semibold);
    background: transparent;
    border: 1px solid;
}

.badge-compliance.public { color: var(--color-public); border-color: var(--color-public); background: var(--color-success-bg); }
.badge-compliance.internal { color: var(--color-internal); border-color: var(--color-internal); background: var(--color-info-bg); }
.badge-compliance.confidential { color: var(--color-confidential); border-color: var(--color-confidential); background: var(--color-warning-bg); }
.badge-compliance.secret { color: var(--color-secret); border-color: var(--color-secret); background: var(--color-error-bg); }
.badge-compliance.personal-data { color: var(--color-personal-data); border-color: var(--color-personal-data); background: var(--color-status-planned-bg); }

/* Page title - shared by entity-title, catalogs-title */
.page-title,
.entity-title,
.catalogs-title {
    font-size: var(--text-h1);
    font-weight: var(--font-semibold);
    line-height: var(--leading-h1);
    letter-spacing: -0.02em;
    margin-bottom: var(--space-2);
    color: var(--color-text-primary);
}

/* Page subtitle base */
.page-subtitle,
.entity-subtitle,
.catalogs-subtitle {
    color: var(--color-text-secondary);
    line-height: var(--leading-body);
}

.entity-subtitle {
    font-size: var(--text-small);
    max-width: var(--prose-max-width);
}

.entity-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-border-subtle);
    font-size: var(--text-caption);
    color: var(--color-text-muted);
}

.entity-meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-1-5);
}

/* ===== Status Indicators - Refined ===== */
.status-indicator {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-small);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

.status-dot.active {
    background: var(--color-status-active);
    box-shadow: 0 0 0 2px var(--color-status-active-bg);
}
.status-dot.draft {
    background: transparent;
    border: 2px solid var(--color-status-draft);
    box-shadow: 0 0 0 2px var(--color-status-draft-bg);
}
.status-dot.deprecated {
    background: var(--color-status-deprecated);
    opacity: var(--opacity-muted);
}
.status-dot.planned {
    width: 8px;
    height: 8px;
    background: var(--color-status-planned);
    clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
    border-radius: 0;
    box-shadow: 0 0 0 2px var(--color-status-planned-bg);
}

/* ===== View Tabs - Refined ===== */
.view-tabs {
    display: flex;
    gap: var(--space-1);
    margin-bottom: 0;
    border-bottom: 1px solid var(--color-border-default);
    padding-bottom: 0;
}

.view-tab {
    padding: var(--space-3) var(--space-5);
    background: none;
    border: none;
    color: var(--color-text-muted);
    font-family: var(--font-sans);
    font-size: var(--text-small);
    font-weight: var(--font-medium);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: all var(--duration-normal) var(--ease-out);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    letter-spacing: var(--tracking-wide);
}

.view-tab:hover {
    color: var(--color-text-primary);
    background: var(--color-bg-hover);
}

.view-tab.active {
    color: var(--color-conceptual);
    border-bottom-color: var(--color-conceptual);
    font-weight: var(--font-semibold);
    background: transparent;
}

.view-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

/* ===== Cards/Panels - Clean, Professional Design ===== */
.card,
.catalog-card,
.mapping-card {
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-lg);
    transition: all var(--duration-fast) var(--ease-out);
}

.card {
    overflow: hidden;
}

.card:hover,
.catalog-card:hover,
.mapping-card:hover {
    border-color: var(--color-border-default);
}

/* Light mode card shadows */
[data-theme="light"] .card,
[data-theme="light"] .catalog-card,
[data-theme="light"] .mapping-card {
    box-shadow: var(--shadow-sm);
}

[data-theme="light"] .card:hover,
[data-theme="light"] .catalog-card:hover,
[data-theme="light"] .mapping-card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    background: transparent;
    cursor: pointer;
    transition: background-color var(--duration-fast) var(--ease-out);
    min-height: 44px;
}

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

.card-title {
    font-size: var(--text-small);
    font-weight: var(--font-semibold);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-text-primary);
    letter-spacing: -0.01em;
}

.card-toggle {
    color: var(--color-text-muted);
    transition: transform var(--duration-fast) var(--ease-out);
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-toggle svg {
    width: var(--icon-xs);
    height: var(--icon-xs);
}

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

.lang-selector {
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    padding: var(--space-1) var(--space-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    cursor: pointer;
    transition: border-color var(--duration-fast) var(--ease-out),
                box-shadow var(--duration-fast) var(--ease-out);
}

.lang-selector:hover {
    border-color: var(--color-border-hover);
}

.lang-selector:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px var(--color-primary-subtle);
}

.card.collapsed .card-toggle {
    transform: rotate(-90deg);
}

.card-content {
    padding: var(--space-4);
    border-top: 1px solid var(--color-border-subtle);
}

.card-content--flush {
    padding: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.card.collapsed .card-content {
    display: none;
}

/* Coming soon hint text */
.coming-soon-hint {
    margin-top: var(--space-4);
    opacity: 0.5;
    font-size: var(--text-caption);
}

/* ===== Metadata Grid - Refined ===== */
.meta-grid {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: var(--space-3) var(--space-4);
    font-size: var(--text-small);
    align-items: baseline;
}

.meta-label {
    color: var(--color-text-muted);
    font-weight: var(--font-medium);
    font-size: var(--text-small);
    letter-spacing: 0.01em;
}

.meta-value {
    color: var(--color-text-primary);
    font-size: var(--text-small);
    line-height: var(--leading-body);
}

.meta-value a.external-link {
    color: var(--color-primary);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
}

.meta-value a.external-link:hover {
    text-decoration: underline;
}

.link-icon {
    display: inline-flex;
    width: 14px;
    height: 14px;
}

.link-icon svg {
    width: 100%;
    height: 100%;
}

/* ===== Tags ===== */
.tag {
    display: inline-block;
    padding: var(--space-1) var(--space-2);
    background: var(--color-bg-base);
    border-radius: var(--radius-sm);
    font-size: var(--text-caption);
    color: var(--color-text-secondary);
    margin-right: var(--space-1);
    margin-bottom: var(--space-1);
}

.tag-mono {
    font-family: var(--font-mono);
    background: var(--color-bg-elevated);
}

/* ===== Mapping Cards - Refined ===== */
.mapping-section {
    margin-bottom: var(--space-6);
}

.mapping-section:last-child {
    margin-bottom: 0;
}

.mapping-section-header {
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: var(--tracking-widest);
    color: var(--color-text-muted);
    margin-bottom: var(--space-3);
    padding-bottom: var(--space-2);
    border-bottom: 1px solid var(--color-border-subtle);
}

.mapping-card {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4) var(--space-5);
    margin-bottom: var(--space-3);
    cursor: pointer;
    border-color: var(--color-border-default);
}

.mapping-card:hover {
    background: var(--color-bg-hover);
    border-color: var(--color-border-strong);
    transform: translateX(2px);
}

[data-theme="light"] .mapping-card:hover {
    background: var(--color-bg-surface);
}

/* Icon box - shared by mapping-icon, catalog-icon */
.icon-box,
.mapping-icon,
.catalog-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.mapping-icon {
    font-weight: var(--font-semibold);
    font-size: var(--text-small);
    background: var(--layer-bg, var(--color-conceptual-bg));
    color: var(--layer-color, var(--color-conceptual));
    border: 1px solid var(--layer-color, var(--color-conceptual));
}

.mapping-icon.logical { --layer-color: var(--color-logical); --layer-bg: var(--color-logical-bg); }
.mapping-icon.physical { --layer-color: var(--color-physical); --layer-bg: var(--color-physical-bg); }

/* Flex content container - grows to fill, allows truncation */
.flex-content,
.mapping-info,
.catalog-info,
.search-result-info {
    flex: 1;
    min-width: 0;
}

.mapping-title {
    font-weight: var(--font-medium);
    margin-bottom: var(--space-1);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--color-text-primary);
}

.mapping-subtitle {
    font-size: var(--text-small);
    color: var(--color-text-muted);
}

.mapping-arrow {
    color: var(--color-text-disabled);
    flex-shrink: 0;
    transition: transform var(--duration-fast) var(--ease-out);
}

.mapping-card:hover .mapping-arrow {
    color: var(--color-text-muted);
    transform: translateX(2px);
}

/* ===== Data Table - Unified Style ===== */
.data-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: var(--text-small);
    table-layout: auto;
}

/* Light mode table with subtle depth */
[data-theme="light"] .card .data-table {
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.data-table th {
    text-align: left;
    padding: var(--space-2-5) var(--space-4);
    background: var(--color-bg-hover);
    color: var(--color-text-muted);
    font-weight: var(--font-semibold);
    font-size: var(--text-2xs);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
    border-bottom: 1px solid var(--color-border-subtle);
    white-space: nowrap;
}

.data-table th:first-child {
    border-radius: var(--radius-sm) 0 0 0;
}

.data-table th:last-child {
    border-radius: 0 var(--radius-sm) 0 0;
}

.data-table td {
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border-subtle);
    vertical-align: middle;
    line-height: var(--leading-small);
    word-break: break-word;
}

/* Unified row hover */
.data-table tbody tr {
    transition: background-color var(--duration-fast) var(--ease-out);
}

.data-table tbody tr:hover {
    background: var(--color-bg-hover);
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

/* Clickable rows - same hover, with cursor */
.data-table tbody tr.clickable-row {
    cursor: pointer;
}

.data-table tbody tr.clickable-row td:first-child {
    position: relative;
}

.data-table tbody tr.clickable-row td:first-child::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: transparent;
    transition: background-color var(--duration-fast) var(--ease-out);
}

.data-table tbody tr.clickable-row:hover td:first-child::before {
    background: var(--color-conceptual);
}

/* ===== Catalog Tab Content ===== */
.catalog-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--space-4);
}

.catalog-stat-item {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4);
    background: var(--color-bg-base);
    border-radius: var(--radius-md);
}

.catalog-stat-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.catalog-stat-icon svg {
    width: var(--icon-xl);
    height: var(--icon-xl);
}

.catalog-stat-content {
    display: flex;
    flex-direction: column;
}

.catalog-stat-value {
    font-size: var(--text-h2);
    font-weight: var(--font-bold);
    color: var(--color-text-primary);
    line-height: 1;
}

.catalog-stat-label {
    font-size: var(--text-small);
    color: var(--color-text-secondary);
    margin-top: var(--space-1);
}

.catalog-domains-list {
    display: flex;
    flex-direction: column;
}

.catalog-domain-item {
    display: flex;
    flex-direction: column;
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border-subtle);
    cursor: pointer;
    transition: background var(--duration-fast) var(--ease-out);
}

.catalog-domain-item:last-child {
    border-bottom: none;
}

.catalog-domain-item:hover {
    background: var(--color-bg-hover);
}

.domain-name {
    font-weight: var(--font-medium);
    color: var(--color-text-primary);
}

.domain-desc {
    font-size: var(--text-small);
    margin-top: var(--space-1);
}

.empty-list-message {
    padding: var(--space-6);
    text-align: center;
    color: var(--color-text-muted);
}

/* Users Tab */
.users-list {
    display: flex;
    flex-direction: column;
}

.user-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border-subtle);
}

.user-item:last-child {
    border-bottom: none;
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: var(--color-conceptual-bg);
    color: var(--color-conceptual);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-small);
    font-weight: var(--font-semibold);
    flex-shrink: 0;
}

.user-info {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-width: 0;
}

.user-name {
    font-weight: var(--font-medium);
    color: var(--color-text-primary);
}

.user-email {
    font-size: var(--text-small);
}

.user-role {
    flex-shrink: 0;
}

/* Members list */
.members-list {
    display: flex;
    flex-direction: column;
}

.member-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border-subtle);
}

.member-item:last-child {
    border-bottom: none;
}

.member-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-medium);
    font-size: var(--text-small);
    color: var(--color-text-secondary);
    flex-shrink: 0;
}

.member-info {
    flex: 1;
    min-width: 0;
}

.member-name {
    display: block;
    font-weight: var(--font-medium);
    color: var(--color-text-primary);
}

.member-email {
    display: block;
    font-size: var(--text-small);
    color: var(--color-text-secondary);
}

.member-role {
    flex-shrink: 0;
}

.roles-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.role-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.role-name {
    font-weight: var(--font-medium);
    color: var(--color-text-primary);
}

.role-desc {
    font-size: var(--text-small);
}

/* Settings Tab */
.settings-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.setting-row {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.setting-toggle-row {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-2) 0;
}

.setting-toggle-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.setting-label {
    font-weight: var(--font-medium);
    color: var(--color-text-primary);
    font-size: var(--text-small);
}

.setting-desc {
    font-size: var(--text-small);
}

/* setting-input and setting-select now inherit from form control base styles */

.toggle {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 22px;
    flex-shrink: 0;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-border-strong);
    transition: background-color var(--duration-fast) var(--ease-out);
    border-radius: var(--radius-full);
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: transform var(--duration-fast) var(--ease-out);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-xs);
}

.toggle input:checked + .toggle-slider {
    background-color: var(--color-logical);
}

.toggle input:checked + .toggle-slider:before {
    transform: translateX(18px);
}

.toggle input:disabled + .toggle-slider {
    opacity: var(--opacity-disabled);
    cursor: not-allowed;
}

/* Danger Zone */
.danger-zone {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.danger-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-md);
    gap: var(--space-4);
}

.danger-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.danger-title {
    font-weight: var(--font-medium);
    color: var(--color-text-primary);
}

.danger-desc {
    font-size: var(--text-small);
}

.btn {
    padding: var(--space-2) var(--space-4);
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: var(--text-small);
    font-weight: var(--font-medium);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-1-5);
    letter-spacing: 0.01em;
    height: 32px;
}

.btn:disabled {
    opacity: var(--opacity-disabled);
    cursor: not-allowed;
}

.btn:active:not(:disabled) {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--color-conceptual);
    color: white;
    box-shadow: var(--shadow-xs);
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-conceptual-light);
    box-shadow: var(--shadow-sm);
}

.btn-secondary {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border-default);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-bg-active);
    border-color: var(--color-border-strong);
}

.btn-outline-danger {
    background: transparent;
    border: 1px solid var(--color-swiss-red);
    color: var(--color-swiss-red);
}

.btn-outline-danger:hover:not(:disabled) {
    background: var(--color-swiss-red-bg);
    border-color: var(--color-swiss-red-hover);
}

.btn-danger {
    background: var(--color-swiss-red);
    color: white;
    box-shadow: var(--shadow-xs);
}

.btn-danger:hover:not(:disabled) {
    background: var(--color-swiss-red-hover);
    box-shadow: var(--shadow-sm);
}

.btn-sm {
    height: 28px;
    padding: var(--space-1-5) var(--space-3);
    font-size: var(--text-caption);
}

/* ===== Empty/Placeholder State - Refined ===== */
.empty-state,
.placeholder-view {
    text-align: center;
    padding: var(--space-8);
    color: var(--color-text-secondary);
}

.placeholder-view {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 280px;
    background: var(--color-bg-surface);
    border: 1px dashed var(--color-border-default);
    border-radius: var(--radius-lg);
}

.empty-state {
    padding: var(--space-12);
}

/* Shared child elements */
.empty-state-icon,
.placeholder-icon {
    font-size: var(--text-icon-xl);
    margin-bottom: var(--space-4);
    opacity: var(--opacity-subtle);
    color: var(--color-text-muted);
}

.empty-state-title,
.placeholder-title {
    font-size: var(--text-body);
    font-weight: var(--font-semibold);
    margin-bottom: var(--space-2);
    color: var(--color-text-primary);
    letter-spacing: -0.01em;
}

.empty-state-text,
.placeholder-desc {
    color: var(--color-text-muted);
    max-width: 280px;
    margin: 0 auto;
    line-height: var(--leading-body);
    font-size: var(--text-small);
}

/* ===== Search Results ===== */
.search-results {
    position: absolute;
    top: 100%;
    right: 0;
    width: 320px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-md);
    margin-top: var(--space-1);
    max-height: 400px;
    overflow-y: auto;
    z-index: 200;
    display: none;
    box-shadow: var(--shadow-lg);
}

.search-results.active {
    display: block;
}

.search-results-header {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-caption);
    color: var(--color-text-muted);
    border-bottom: 1px solid var(--color-border-default);
}

.search-result-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    cursor: pointer;
    transition: background-color var(--duration-fast) var(--ease-out);
}

.search-result-item:hover {
    background: var(--color-bg-hover);
}

.search-result-name {
    font-weight: var(--font-medium);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.search-result-meta {
    font-size: var(--text-caption);
    color: var(--color-text-muted);
}

/* ===== Scrollbar - Refined ===== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--color-border-strong);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}

/* Only show scrollbar on hover for cleaner look */
.tree-container::-webkit-scrollbar-thumb {
    background: transparent;
}

.tree-container:hover::-webkit-scrollbar-thumb {
    background: var(--color-border-strong);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: var(--header-height);
        bottom: 0;
        z-index: 50;
        transform: translateX(0);
        transition: transform var(--duration-slow) var(--ease-in-out);
    }

    .sidebar.collapsed {
        transform: translateX(-100%);
    }

    /* Make toggle larger and keep it visible when sidebar is collapsed */
    .sidebar-toggle {
        width: 44px;
        height: 44px;
        right: -22px;
    }

    .sidebar.collapsed .sidebar-toggle {
        position: fixed;
        left: 12px;
        top: calc(var(--header-height) + 12px);
        right: auto;
        transform: none;
        z-index: 51;
        box-shadow: var(--shadow-md);
    }

    .sidebar-overlay {
        position: fixed;
        inset: 0;
        top: var(--header-height);
        background: rgba(0, 0, 0, 0.5);
        z-index: 40;
        display: none;
    }

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

@media (max-width: 768px) {
    .layer-tabs {
        display: none;
    }

    .header {
        gap: var(--space-3);
    }

    .logo span {
        display: none;
    }

    .main-content {
        padding: var(--space-4);
    }

    .meta-grid {
        grid-template-columns: 1fr;
        gap: var(--space-2);
    }

    .meta-label {
        margin-top: var(--space-2);
    }

    .breadcrumb {
        padding: 0;
    }

    .data-table th,
    .data-table td {
        padding: var(--space-2) var(--space-3);
    }

    /* Mobile touch targets - 44px minimum */
    .header-right .icon-btn,
    .search-toggle,
    .lang-selector {
        min-width: 44px;
        min-height: 44px;
    }

    .sidebar-control-btn {
        width: 40px;
        height: 40px;
    }

    /* Better dropdown/menu option spacing for touch */
    .dropdown-option,
    .sort-option,
    .group-by-option {
        padding: var(--space-3) var(--space-4);
    }

    /* Footer text more readable */
    .footer {
        font-size: var(--text-small);
    }

    /* Diagram controls larger on mobile */
    .diagram-control-btn {
        width: 40px;
        height: 40px;
    }
}

/* Extra small phones */
@media (max-width: 480px) {
    .main-content {
        padding: var(--space-3);
    }

    .header {
        padding: 0 var(--space-3);
    }

    .card-header {
        padding: var(--space-3);
    }

    .card-content {
        padding: var(--space-3);
    }

    /* Stack breadcrumb items */
    .breadcrumb {
        flex-wrap: wrap;
    }

    /* Ensure touch targets are large enough */
    .header-right .icon-btn,
    .search-toggle {
        min-width: 44px;
        min-height: 44px;
    }

    /* Tabs stack or scroll */
    .tabs {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .tab-btn {
        padding: var(--space-2) var(--space-3);
        white-space: nowrap;
    }
}

/* ========================================
   SVG Icons (inline)
   ======================================== */
.icon {
    display: inline-block;
    width: 1em;
    height: 1em;
    vertical-align: middle;
}

/* ========================================
   Catalog Overview Page
   ======================================== */
.catalogs-overview {
    max-width: 840px;
    width: 100%;
    margin: 0 auto;
}

.catalogs-header {
    margin-bottom: var(--space-6);
    text-align: center;
}

.catalogs-subtitle {
    font-size: var(--text-small);
    max-width: 420px;
    margin: 0 auto;
}

.catalogs-stats {
    display: flex;
    gap: var(--space-6);
    margin-top: var(--space-6);
    padding: var(--space-4) var(--space-5);
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-lg);
}

.stat-item {
    text-align: center;
}

.stat-value {
    font-size: var(--text-h1);
    font-weight: var(--font-semibold);
    color: var(--color-text-primary);
}

.stat-label {
    font-size: var(--text-caption);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
}

.catalogs-header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    margin-bottom: var(--space-2);
}

.btn-new-catalog {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--color-logical);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--text-small);
    font-weight: var(--font-medium);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
    white-space: nowrap;
}

.btn-new-catalog:hover {
    background: var(--color-logical-hover, #059669);
    transform: translateY(-1px);
}

.btn-new-catalog svg {
    width: var(--icon-md);
    height: var(--icon-md);
}

.catalogs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: var(--space-4);
}

.catalogs-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.catalog-card {
    padding: var(--space-5);
    cursor: pointer;
}

.catalog-card:hover {
    transform: translateY(-1px);
}

/* Row layout for stacked list view */
.catalogs-list .catalog-card {
    display: flex;
    align-items: center;
    gap: var(--space-5);
    padding: var(--space-4) var(--space-5);
}

.catalogs-list .catalog-card-header {
    flex-shrink: 0;
    width: 200px;
    margin-bottom: 0;
}

.catalogs-list .catalog-description {
    flex: 1;
    margin-bottom: 0;
    min-width: 0;
}

.catalogs-list .catalog-meta {
    flex-shrink: 0;
    border-top: none;
    padding-top: 0;
    gap: var(--space-4);
}

.catalogs-list .catalog-activity {
    margin-left: 0;
    white-space: nowrap;
}

.catalog-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    margin-bottom: var(--space-3);
}

.catalog-icon {
    font-size: var(--text-h3);
    background: var(--catalog-color, var(--color-conceptual));
    color: white;
}

.catalog-name {
    font-size: var(--text-small);
    font-weight: var(--font-semibold);
    color: var(--color-text-primary);
    margin-bottom: var(--space-0-5);
    line-height: var(--leading-h3);
}

.catalog-owner {
    font-size: var(--text-2xs);
    color: var(--color-text-muted);
}

/* Status badge base */
.catalog-status {
    padding: 2px var(--space-2);
    border-radius: var(--radius-full);
    font-weight: var(--font-semibold);
    flex-shrink: 0;
    font-size: var(--text-2xs);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.catalog-status.active {
    background: var(--color-logical-bg);
    color: var(--color-logical);
}

.catalog-status.draft {
    background: var(--color-physical-bg);
    color: var(--color-physical);
}

.catalog-status.archived,
.catalog-status.deprecated {
    background: var(--color-bg-hover);
    color: var(--color-text-muted);
}

.catalog-description {
    font-size: var(--text-caption);
    color: var(--color-text-secondary);
    line-height: var(--leading-small);
    margin-bottom: var(--space-3);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.catalog-meta {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border-subtle);
}

.catalog-meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-2xs);
    color: var(--color-text-muted);
}

.catalog-meta-item svg {
    width: var(--icon-xs);
    height: var(--icon-xs);
    opacity: var(--opacity-muted);
}

.catalog-meta-value {
    font-weight: var(--font-semibold);
    color: var(--color-text-secondary);
}

.catalog-activity {
    margin-left: auto;
    font-size: var(--text-2xs);
    color: var(--color-text-muted);
}

/* Catalog page specific breadcrumb */
.breadcrumb-home {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    transition: all var(--duration-fast) var(--ease-out);
}

.breadcrumb-home:hover {
    color: var(--color-text-primary);
    background: var(--color-bg-hover);
}

.breadcrumb-home svg {
    width: var(--icon-sm);
    height: var(--icon-sm);
}

@media (max-width: 768px) {
    .catalogs-grid {
        grid-template-columns: 1fr;
    }

    .catalogs-header-top {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-3);
    }

    .catalogs-list .catalog-card {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-3);
    }

    .catalogs-list .catalog-card-header {
        width: 100%;
    }

    .catalogs-list .catalog-meta {
        flex-wrap: wrap;
        width: 100%;
        border-top: 1px solid var(--color-border-subtle);
        padding-top: var(--space-3);
    }

    .catalogs-stats {
        flex-wrap: wrap;
        gap: var(--space-4);
    }

    .stat-item {
        flex: 1;
        min-width: 80px;
    }
}

/* ========================================
   Catalogs Overview Mode
   Hide sidebar and search when viewing all catalogs
   ======================================== */
.catalogs-overview-mode .sidebar {
    display: none;
}

.catalogs-overview-mode .header-right {
    margin-left: auto;
}

.catalogs-overview-mode .breadcrumb {
    display: none;
}

.catalogs-overview-mode .main-layout {
    max-width: 100%;
    justify-content: center;
}

.catalogs-overview-mode .main-content {
    padding: var(--space-8);
    width: 100%;
    max-width: 100%;
    align-items: center;
}

/* ===== Global Animations ===== */
.catalog-card,
.card {
    animation: fadeIn var(--duration-normal) var(--ease-out);
}

/* ===== Selection & Highlight styles ===== */
::selection {
    background: var(--color-conceptual);
    color: #FFFFFF;
}

::-moz-selection {
    background: var(--color-conceptual);
    color: #FFFFFF;
}

/* ===== Focus ring enhancement ===== */
*:focus-visible {
    outline: 2px solid var(--color-conceptual);
    outline-offset: 2px;
}

/* ===== Smooth scroll for better UX ===== */
html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .catalog-card,
    .card,
    .loading-spinner {
        animation: none;
    }
}

/* ========================================
   Diagram View - Mermaid Integration
   ======================================== */
.diagram-card .diagram-content {
    padding: var(--space-4);
    min-height: 400px;
    position: relative;
    overflow: hidden;
    flex: 1;
}

/* Viewport for pan/zoom */
.diagram-viewport {
    width: 100%;
    height: calc(100vh - 320px);
    min-height: 400px;
    max-height: 900px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.diagram-container,
.mermaid-diagram {
    display: flex;
    justify-content: center;
    transition: transform 0.1s ease-out;
    will-change: transform;
}

.mermaid-diagram svg {
    max-width: 100%;
    height: auto;
}

/* D2 specific scaling */
.diagram-container svg {
    max-width: none;
    height: auto;
}

/* Diagram Controls */
.diagram-controls {
    position: absolute;
    bottom: var(--space-4);
    right: var(--space-4);
    display: flex;
    gap: var(--space-1);
    background: var(--color-bg-surface);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-md);
    padding: var(--space-1);
    box-shadow: var(--shadow-md);
    z-index: 10;
}

.diagram-control-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
}

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

.diagram-control-btn:active {
    background: var(--color-bg-active);
    transform: scale(0.95);
}

.diagram-control-btn svg {
    width: 16px;
    height: 16px;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* Fullscreen mode */
.diagram-card:fullscreen {
    background: var(--color-bg-base);
    padding: var(--space-6);
}

.diagram-card:fullscreen .diagram-content {
    height: calc(100vh - 120px);
}

.diagram-card:fullscreen .diagram-viewport {
    height: calc(100vh - 160px);
}

.diagram-card:fullscreen .diagram-controls {
    bottom: var(--space-6);
    right: var(--space-6);
}

.diagram-card:fullscreen .card-header {
    background: var(--color-bg-surface);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.diagram-card:fullscreen .diagram-legend {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.diagram-error {
    color: var(--color-text-muted);
    font-size: var(--text-small);
    padding: var(--space-8);
    text-align: center;
}

.diagram-legend {
    padding: var(--space-3) var(--space-5);
    border-top: 1px solid var(--color-border-subtle);
    background: var(--color-bg-hover);
}

.legend-items {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-caption);
    color: var(--color-text-secondary);
}

.legend-color {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-xs);
    flex-shrink: 0;
}

.legend-symbol {
    font-family: var(--font-mono);
    font-size: var(--text-2xs);
    font-weight: var(--font-semibold);
    padding: 2px var(--space-1);
    background: var(--color-bg-base);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-xs);
    color: var(--color-text-muted);
}

.legend-label {
    white-space: nowrap;
}

/* Light mode diagram adjustments */
[data-theme="light"] .diagram-controls {
    background: #FFFFFF;
    box-shadow: var(--shadow-sm);
}

[data-theme="light"] .diagram-card .diagram-legend {
    background: var(--color-bg-surface);
}

/* Responsive diagram */
@media (max-width: 768px) {
    .diagram-card .diagram-content {
        padding: var(--space-3);
        min-height: 200px;
    }

    .diagram-viewport {
        height: 300px;
    }

    .diagram-controls {
        bottom: var(--space-3);
        right: var(--space-3);
    }

    .diagram-control-btn {
        width: 28px;
        height: 28px;
    }

    .diagram-control-btn svg {
        width: 14px;
        height: 14px;
    }

    .legend-items {
        gap: var(--space-3);
    }

    .legend-item {
        font-size: var(--text-2xs);
    }
}

/* ========================================
   Footer
   ======================================== */
.footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-1) var(--space-4);
    background: var(--color-bg-base);
    border-top: 1px solid var(--color-border-subtle);
    font-size: var(--text-2xs);
    color: var(--color-text-muted);
    flex-shrink: 0;
}

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

.footer-separator {
    color: var(--color-text-disabled);
}

.footer-link {
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-out);
}

.footer-link:hover {
    color: var(--color-text-primary);
    text-decoration: underline;
}

.footer-link-disabled {
    opacity: var(--opacity-disabled);
    cursor: not-allowed;
    pointer-events: none;
}

.footer-version {
    color: var(--color-text-muted);
}

@media (max-width: 768px) {
    .footer {
        padding: var(--space-2) var(--space-3);
    }

    .footer-left {
        gap: var(--space-1);
    }
}