:root {
    --app-bg: #c3ccd4;
    --panel: #ffffff;
    --panel-soft: #f4f8fc;
    --menu-shell: #9aa8b8;
    --menu-shell-deep: #7a8999;
    --menu-panel: #f7fafe;
    --menu-panel-strong: #ffffff;
    --sidebar-button-bg: #ffffff;
    --sidebar-button-bg-strong: #ffffff;
    --sidebar-button-border: #c6d7ea;
    --border: #d2dbe6;
    --border-strong: #c1ccda;
    --text: #000000;
    --text-soft: #5f6b78;
    --text-dim: #7d8894;
    --accent: #445d77;
    --accent-soft: #edf3f8;
    --success: #2f6f57;
    --success-soft: #eef7f2;
    --warning: #8a6a31;
    --warning-soft: #fbf5e8;
    --danger: #a24d4d;
    --overlay: rgba(20, 28, 36, 0.22);
}

* {
    box-sizing: border-box;
}

[hidden] {
    display: none !important;
}

html,
body {
    margin: 0;
    padding: 0;
    min-height: 100%;
    overflow: hidden;
    font-family: "Segoe UI", Tahoma, sans-serif;
    background: var(--app-bg);
    color: var(--text);
}

body {
    min-height: 100vh;
}

body[data-ui-theme="dark"] {
    --app-bg: #0f1820;
    --panel: #16212b;
    --panel-soft: #1e2c37;
    --menu-shell: #1a2834;
    --menu-shell-deep: #0f1820;
    --menu-panel: #1c2a35;
    --menu-panel-strong: #243440;
    --sidebar-button-bg: #243441;
    --sidebar-button-bg-strong: #2a3d4c;
    --sidebar-button-border: #435a6c;
    --border: #2f4150;
    --border-strong: #3d5363;
    --text: #edf4fa;
    --text-soft: #b4c6d6;
    --text-dim: #8ca0b2;
    --accent: #9cc6f0;
    --accent-soft: #2b3d4d;
    --success: #8fe0b3;
    --success-soft: #21362d;
    --warning: #f0ca8a;
    --warning-soft: #3a3122;
    --danger: #efaaaa;
    --overlay: rgba(4, 9, 13, 0.58);
}

#app {
    display: flex;
    gap: 16px;
    height: 100vh;
    padding: 16px;
    background: var(--app-bg);
}

#mode-dock {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 60px;
    flex-shrink: 0;
    padding: 8px 6px;
    border: 1px solid rgba(199, 207, 216, 0.95);
    border-radius: 18px;
    background: linear-gradient(180deg, #ffffff 0%, #f7f9fc 100%);
    box-shadow: 0 12px 24px rgba(24, 31, 39, 0.12);
}

.dock-button {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 92px;
    margin-top: 0;
    padding: 12px 8px;
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    border-color: #d8e2ec;
    background: linear-gradient(180deg, #f7fbff 0%, #eef5fb 100%);
    box-shadow: 0 1px 2px rgba(23, 32, 42, 0.05);
}

.dock-button.is-active {
    border-color: var(--accent);
    background: #e4edf6;
    color: var(--accent);
}

#sidebar {
    width: 340px;
    flex-shrink: 0;
    overflow: hidden;
    border: 1px solid rgba(235, 244, 255, 0.938);
    border-radius: 18px;
    background: linear-gradient(180deg, var(--menu-shell-deep) 0%, var(--menu-shell) 100%);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.16);
}

.sidebar-shell {
    display: flex;
    flex-direction: column;
    gap: 12px;
    height: 100%;
    padding: 14px;
    overflow-y: auto;
    background: var(--panel);
}

.menu-section,
#workspace,
.bottom-axis-bar,
.preview-content,
.modal-content {
    border: 1px solid var(--border);
    border-radius: 14px;
    background: var(--panel);
}

.brand-kicker,
.overlay-kicker,
.workspace-kicker {
    margin: 0 0 8px;
    color: var(--text-dim);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.app-title {
    margin: 0;
    font-size: 26px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text);
}

.brand-banner {
    padding: 2px 2px 6px;
}

.app-subtitle {
    margin: 8px 0 0;
    color: var(--text-soft);
    font-size: 13px;
    line-height: 1.5;
}

.brand-meta,
.menu-chip,
.section-copy {
    display: none;
}

.menu-section {
    padding: 16px;
    background: linear-gradient(180deg, var(--menu-panel) 0%, #ffffff 100%);
    box-shadow: 0 1px 2px rgba(23, 32, 42, 0.05);
}

.menu-section-footer {
    margin-top: auto;
}

.menu-section-highlight {
    background: linear-gradient(180deg, var(--menu-panel) 0%, var(--menu-panel-strong) 100%);
}

.menu-heading {
    margin-bottom: 10px;
}

.menu-header {
    color: var(--text);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.tool-hint,
.field-note {
    display: block;
    margin-top: 8px;
    color: var(--text-soft);
    font-size: 12px;
    line-height: 1.45;
}

.inline-row {
    display: flex;
    gap: 8px;
}

.axis-type-select {
    width: 96px;
    flex-shrink: 0;
}

.axis-lists {
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px solid var(--border);
    max-height: 164px;
    overflow-y: auto;
}

.axis-list-spaced {
    margin-top: 8px;
}

#axis-lists small {
    display: block;
    margin-bottom: 8px;
    color: var(--text-dim);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

button,
input,
select,
textarea {
    font: inherit;
}

button {
    width: 100%;
    min-height: 38px;
    margin-top: 8px;
    padding: 9px 12px;
    border: 1px solid var(--border-strong);
    border-radius: 10px;
    background: var(--panel);
    color: var(--text);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}

button:hover {
    border-color: #b8c2cd;
    background: var(--panel-soft);
}

#sidebar button {
    border-color: var(--sidebar-button-border);
    background: linear-gradient(180deg, var(--sidebar-button-bg) 0%, var(--sidebar-button-bg-strong) 100%);
}

#sidebar button:hover {
    border-color: #b7cbe1;
    background: linear-gradient(180deg, #f9fbff 0%, #edf4fb 100%);
}

button:disabled {
    cursor: default;
    border-color: var(--border);
    background: var(--panel-soft);
    color: var(--text-dim);
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid rgba(49, 80, 110, 0.2);
    outline-offset: 1px;
    border-color: var(--accent);
}

.tool-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    margin-top: 12px;
}

[data-tool] {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 40px;
    margin-top: 0;
    padding: 0;
    text-align: center;
    font-size: 17px;
    line-height: 1;
}

[data-tool]::before,
[data-tool]::after {
    position: absolute;
    left: 50%;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease, transform 0.15s ease;
}

[data-tool]::before {
    content: "";
    bottom: calc(100% + 3px);
    width: 10px;
    height: 10px;
    border-top: 1px solid var(--border-strong);
    border-left: 1px solid var(--border-strong);
    background: rgba(255, 255, 255, 0.98);
    transform: translate(-50%, 6px) rotate(45deg);
    z-index: 1;
}

[data-tool]::after {
    content: attr(data-tooltip);
    bottom: calc(100% + 8px);
    padding: 7px 9px;
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.98);
    color: var(--text);
    font-size: 11px;
    font-weight: 600;
    line-height: 1.2;
    white-space: nowrap;
    box-shadow: 0 10px 24px rgba(23, 32, 42, 0.12);
    transform: translate(-50%, 6px);
    z-index: 2;
}

[data-tool]:hover::before,
[data-tool]:focus-visible::before {
    opacity: 1;
    transform: translate(-50%, 0) rotate(45deg);
}

[data-tool]:hover::after,
[data-tool]:focus-visible::after {
    opacity: 1;
    transform: translate(-50%, 0);
}

.tool-symbol {
    display: block;
}

.export-mode-switch {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
    margin-top: 12px;
}

.export-mode-button {
    margin-top: 0;
}

.export-mode-button.is-active {
    border-color: var(--accent);
    background: var(--accent-soft);
    color: var(--accent);
}

.export-panel-title {
    margin-top: 14px;
    color: var(--text);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.grid-system-launch {
    background: linear-gradient(180deg, #eff5fc 0%, #e7eef8 100%);
    color: var(--accent);
    border-color: #c3d3e5;
}

.grid-system-launch-secondary {
    background: linear-gradient(180deg, var(--sidebar-button-bg) 0%, var(--sidebar-button-bg-strong) 100%);
    color: var(--text);
    border-color: var(--sidebar-button-border);
}

[data-tool="delete"] {
    border-color: #d8b3b3;
    background: #fbefef;
    color: var(--danger);
}

.active-tool {
    border-color: var(--accent) !important;
    background: var(--accent-soft) !important;
    color: var(--accent);
}

.btn-preview {
    border-color: #c3d3e5;
    background: linear-gradient(180deg, #f2f7fd 0%, #e8f0f9 100%);
    color: var(--accent);
}

.btn-preview:hover {
    background: linear-gradient(180deg, #f9fbff 0%, #edf4fb 100%);
}

.btn-export {
    border-color: #c3d3e5;
    background: linear-gradient(180deg, #f2f7fd 0%, #e8f0f9 100%);
    color: var(--accent);
}

.btn-export:hover {
    background: linear-gradient(180deg, #f9fbff 0%, #edf4fb 100%);
}

.btn-del-axis {
    width: 24px;
    min-width: 24px;
    height: 24px;
    min-height: 24px;
    margin: 0;
    padding: 0;
    border-radius: 8px;
    border-color: #d8b3b3;
    background: #fbefef;
    color: var(--danger);
    font-size: 11px;
}

.axis-item,
.item-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-top: 6px;
    padding: 9px 10px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--panel-soft);
    color: var(--text);
    font-size: 13px;
}

.item-row.is-active {
    border-color: #b9c9d8;
    background: var(--accent-soft);
}

.level-button {
    width: auto;
    min-height: auto;
    margin: 0;
    padding: 0;
    border: 0;
    background: transparent;
    color: inherit;
    text-align: left;
    font-weight: 600;
}

.level-meta {
    color: var(--text-dim);
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
}

label {
    display: block;
    margin-top: 12px;
    color: var(--text-soft);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

input,
select,
textarea {
    width: 100%;
    margin-top: 6px;
    padding: 10px 12px;
    border: 1px solid var(--border-strong);
    border-radius: 10px;
    background: var(--panel);
    color: var(--text);
    font-size: 13px;
}

input::placeholder,
textarea::placeholder {
    color: var(--text-dim);
}

textarea {
    resize: vertical;
    min-height: 88px;
}

#workspace {
    position: relative;
    display: flex;
    flex-direction: column;
    flex: 1;
    overflow: hidden;
    background: var(--panel);
}

#canvas-stage {
    --model-space-bg: #f4f8fc;
    --model-space-grid-color: rgba(112, 134, 156, 0.06);
    --model-space-chip-bg: rgba(255, 255, 255, 0.84);
    --model-space-chip-border: rgba(210, 219, 230, 0.95);
    --model-space-chip-text: #17202a;
    --model-space-chip-shadow: 0 10px 24px rgba(31, 41, 51, 0.08);
    position: relative;
    flex: 1;
    height: 100%;
    min-height: 0;
    overflow: hidden;
    background: var(--model-space-bg);
}

#canvas-stage[data-model-space-theme="dark"] {
    --model-space-bg: #16222d;
    --model-space-grid-color: rgba(156, 182, 207, 0.09);
    --model-space-chip-bg: rgba(19, 30, 40, 0.82);
    --model-space-chip-border: rgba(132, 158, 183, 0.34);
    --model-space-chip-text: #edf4fa;
    --model-space-chip-shadow: 0 14px 28px rgba(0, 0, 0, 0.28);
}

#canvas-stage::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        linear-gradient(var(--model-space-grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--model-space-grid-color) 1px, transparent 1px);
    background-size: 36px 36px;
    pointer-events: none;
}

.workspace-overlay {
    position: absolute;
    inset: 14px 14px auto 14px;
    z-index: 2;
    display: flex;
    justify-content: flex-end;
    pointer-events: none;
}

.workspace-toolbar {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 10px;
    margin-left: auto;
}

.workspace-card {
    display: block;
    max-width: 380px;
    padding: 14px 16px;
    border: 1px solid var(--model-space-chip-border);
    border-radius: 20px;
    background: var(--model-space-chip-bg);
    color: var(--model-space-chip-text);
    backdrop-filter: blur(4px);
    box-shadow: var(--model-space-chip-shadow);
}

.workspace-card .workspace-kicker {
    margin-bottom: 6px;
    color: var(--model-space-chip-text);
    opacity: 0.72;
}

.workspace-title {
    margin: 0;
    color: var(--model-space-chip-text);
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.workspace-note {
    margin: 8px 0 0;
    color: var(--model-space-chip-text);
    font-size: 12px;
    line-height: 1.45;
    opacity: 0.86;
}

.workspace-level-switch,
.model-space-theme-switch {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 40px;
    border: 1px solid var(--model-space-chip-border);
    border-radius: 999px;
    background: var(--model-space-chip-bg);
    color: var(--model-space-chip-text);
    font-size: 12px;
    font-weight: 700;
    backdrop-filter: blur(4px);
    box-shadow: var(--model-space-chip-shadow);
}

.workspace-level-switch {
    padding: 5px 6px 5px 10px;
    pointer-events: auto;
}

.model-space-theme-switch {
    width: auto;
    min-width: 0;
    margin: 0;
    padding: 5px 10px 5px 8px;
    justify-content: flex-start;
    pointer-events: auto;
}

.model-space-theme-switch-track {
    position: relative;
    width: 38px;
    height: 22px;
    flex-shrink: 0;
    border: 1px solid rgba(143, 164, 184, 0.38);
    border-radius: 999px;
    background: rgba(143, 164, 184, 0.22);
    transition: background 0.15s ease, border-color 0.15s ease;
}

.model-space-theme-switch-thumb {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 16px;
    height: 16px;
    border-radius: 999px;
    background: #ffffff;
    box-shadow: 0 1px 2px rgba(23, 32, 42, 0.18);
    transition: transform 0.15s ease, background 0.15s ease;
}

.model-space-theme-switch[aria-checked="true"] .model-space-theme-switch-track {
    border-color: rgba(120, 177, 235, 0.44);
    background: rgba(120, 177, 235, 0.28);
}

.model-space-theme-switch[aria-checked="true"] .model-space-theme-switch-thumb {
    transform: translateX(16px);
}

.model-space-theme-label {
    white-space: nowrap;
}

.workspace-level-actions {
    display: flex;
    flex-direction: row;
    gap: 4px;
}

.workspace-level-button {
    width: 26px;
    min-width: 26px;
    min-height: 16px;
    margin: 0;
    padding: 0;
    border-radius: 999px;
    border-color: rgba(163, 177, 191, 0.44);
    background: rgba(255, 255, 255, 0.58);
    color: inherit;
    font-size: 13px;
    line-height: 1;
}

.workspace-level-button:hover,
.model-space-theme-switch:hover {
    border-color: rgba(126, 155, 182, 0.52);
}

.workspace-level-button:hover {
    background: rgba(255, 255, 255, 0.76);
}

#canvas-stage[data-model-space-theme="dark"] .model-space-theme-switch-track {
    border-color: rgba(151, 182, 214, 0.36);
    background: rgba(108, 154, 205, 0.22);
}

#canvas-stage[data-model-space-theme="dark"] .model-space-theme-switch-thumb {
    background: #f4f8fd;
}

#canvas-stage[data-model-space-theme="dark"] .workspace-level-button {
    border-color: rgba(132, 158, 183, 0.32);
    background: rgba(255, 255, 255, 0.08);
}

#canvas-stage[data-model-space-theme="dark"] .workspace-level-button:hover {
    background: rgba(255, 255, 255, 0.14);
}

.workspace-level-label {
    min-width: 90px;
    padding: 0 4px;
    text-align: left;
    white-space: nowrap;
}

canvas {
    position: relative;
    z-index: 1;
    display: block;
    width: 100%;
    height: 100%;
    cursor: crosshair;
    background: transparent;
}

#mainCanvas {
    width: 100%;
    height: 100%;
}

#language-switcher {
    position: fixed;
    right: 18px;
    bottom: 18px;
    z-index: 950;
    display: inline-flex;
    gap: 4px;
    padding: 4px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 0 10px 24px rgba(23, 32, 42, 0.14);
    backdrop-filter: blur(8px);
}

.language-switch-button {
    width: auto;
    min-width: 52px;
    min-height: 34px;
    margin-top: 0;
    padding: 7px 12px;
    border-radius: 999px;
    background: transparent;
    border-color: transparent;
    font-size: 12px;
    font-weight: 700;
}

.language-switch-button:hover {
    background: rgba(68, 93, 119, 0.08);
    border-color: transparent;
}

.language-switch-button.is-active {
    background: var(--accent);
    border-color: var(--accent);
    color: #ffffff;
}

#modal-overlay,
#preview-overlay,
#system-modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: none;
    justify-content: center;
    align-items: center;
    background: var(--overlay);
    backdrop-filter: blur(4px);
}

.modal-content,
.preview-content {
    padding: 20px;
}

.system-modal-content {
    width: min(1080px, 96vw);
}

.system-modal-tabs {
    display: flex;
    gap: 10px;
    margin-top: 16px;
    margin-bottom: 18px;
}

.system-tab-button {
    width: auto;
    min-width: 132px;
    margin-top: 0;
    background: var(--panel);
    color: var(--text-soft);
}

.system-tab-button.is-active {
    border-color: #b9c9d8;
    background: var(--accent-soft);
    color: var(--accent);
}

.system-tab-panel {
    display: none;
}

.system-tab-panel.is-active {
    display: block;
}

.grid-modal-grid {
    display: grid;
    grid-template-columns: minmax(190px, 220px) minmax(0, 2fr);
    gap: 162px;
    align-items: start;
}

.grid-modal-form .inline-row {
    margin-top: 6px;
}

.grid-inline-row {
    align-items: stretch;
    gap: 8px;
}

.grid-inline-row input[type="number"] {
    flex: 0 0 124px;
    min-width: 124px;
}

.grid-inline-row .axis-type-select {
    width: 100%;
    min-width: 0;
}

.grid-axis-lists {
    justify-self: end;
    width: min(100%, 620px);
    margin-top: 0;
    margin-left: 18px;
    padding-top: 0;
    border-top: 0;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    max-height: 340px;
}

.grid-axis-panel {
    min-width: 0;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--panel-soft);
}

.grid-axis-panel .axis-item {
    background: var(--panel);
}

.grid-axis-panel.axis-list-spaced {
    margin-top: 0;
}

.overlay-kicker {
    color: var(--text-dim);
}

.modal-content {
    width: min(440px, 92vw);
    max-height: 84vh;
    overflow-y: auto;
}

.modal-content.system-modal-content {
    width: min(880px, 96vw);
}

.levels-modal-toolbar {
    margin-top: 0;
}

.levels-modal-toolbar button {
    margin-top: 0;
    width: auto;
    min-width: 180px;
}

.levels-manager-list {
    display: grid;
    gap: 8px;
    margin-top: 14px;
    max-height: min(58vh, 560px);
    overflow-y: auto;
    padding-right: 4px;
}

.level-manager-row {
    display: flex;
    align-items: center;
    gap: 10px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--panel-soft);
    padding: 9px 12px;
}

.level-manager-row.is-active {
    border-color: #b9c9d8;
    background: var(--accent-soft);
}

.level-manager-name-input {
    width: 180px;
    min-width: 160px;
    flex: 0 0 180px;
    margin-top: 0;
    padding: 8px 10px;
}

.level-manager-summary {
    flex: 1 1 110px;
    color: var(--text-soft);
    font-size: 12px;
    white-space: nowrap;
}

.level-manager-badge {
    display: inline-flex;
    align-items: center;
    min-height: 24px;
    padding: 0 8px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.75);
    color: var(--text-soft);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    white-space: nowrap;
}

.level-manager-height {
    display: flex;
    align-items: center;
    gap: 6px;
    width: 116px;
    flex: 0 0 116px;
}

.level-manager-height-input {
    margin-top: 0;
    padding: 8px 10px;
    text-align: right;
}

.level-manager-unit {
    color: var(--text-soft);
    font-size: 12px;
    font-weight: 600;
}

.level-manager-order {
    display: flex;
    gap: 6px;
    flex: 0 0 auto;
}

.level-manager-icon-button {
    width: 34px;
    min-width: 34px;
    min-height: 34px;
    padding: 0;
    margin-top: 0;
    font-size: 14px;
}

.level-manager-actions {
    display: flex;
    gap: 8px;
    margin-top: 0;
    flex: 0 0 auto;
}

.level-manager-button {
    width: auto;
    min-height: 34px;
    padding: 8px 10px;
    margin-top: 0;
    white-space: nowrap;
}

.level-manager-button-danger {
    border-color: #d8b3b3;
    background: #fbefef;
    color: var(--danger);
}

#modal-fields {
    padding-top: 4px;
}

#modal-fields label:first-child {
    margin-top: 0;
}

.modal-subsection {
    margin-top: 14px;
    padding-top: 10px;
    border-top: 1px solid var(--border);
}

.column-rebar-grid {
    display: grid;
    gap: 10px;
    margin-top: 8px;
}

.column-rebar-card {
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--panel-soft);
}

.column-rebar-card.is-disabled {
    opacity: 0.72;
}

.column-rebar-card-title {
    color: var(--text);
    font-size: 12px;
    font-weight: 700;
}

.column-checkbox-row {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
    color: var(--text);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: normal;
    text-transform: none;
}

.column-checkbox-row input {
    width: 16px;
    height: 16px;
    margin: 0;
    accent-color: var(--accent);
}

.column-inline-row {
    margin-top: 8px;
    align-items: stretch;
}

.column-count-input {
    width: 108px;
    flex: 0 0 108px;
    margin-top: 0;
}

.modal-title,
.preview-title {
    margin: 0;
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
}

.preview-content {
    display: flex;
    flex-direction: column;
    width: min(1180px, 94vw);
    height: min(820px, 90vh);
}

.overlay-header {
    margin-bottom: 12px;
}

.preview-canvas {
    flex: 1;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: #0d1218;
}

.close-preview-btn {
    margin-top: 12px;
}

.modal-actions {
    display: flex;
    gap: 10px;
    margin-top: 18px;
}

.modal-actions button {
    margin-top: 0;
}

.primary-btn {
    border-color: #b9c9d8;
    background: var(--accent-soft);
    color: var(--accent);
}

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

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

::-webkit-scrollbar-thumb {
    border: 2px solid transparent;
    border-radius: 999px;
    background: #c9d0d8;
    background-clip: padding-box;
}

body[data-ui-theme="dark"] #mode-dock {
    border-color: rgba(67, 86, 102, 0.96);
    background: linear-gradient(180deg, #18232d 0%, #22313d 100%);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.26);
}

body[data-ui-theme="dark"] .dock-button {
    border-color: #405565;
    background: linear-gradient(180deg, #243646 0%, #1d2d39 100%);
    color: var(--text-soft);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.22);
}

body[data-ui-theme="dark"] .dock-button:hover {
    border-color: #5a748a;
    background: linear-gradient(180deg, #304657 0%, #273949 100%);
}

body[data-ui-theme="dark"] .dock-button.is-active {
    border-color: var(--accent);
    background: #355166;
    color: var(--text);
}

body[data-ui-theme="dark"] .dock-button.is-active:hover {
    border-color: var(--accent);
    background: #355166;
    color: var(--text);
}

body[data-ui-theme="dark"] #sidebar {
    border-color: rgba(67, 86, 102, 0.96);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

body[data-ui-theme="dark"] .menu-section {
    background: linear-gradient(180deg, var(--menu-panel) 0%, #16222b 100%);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.18);
}

body[data-ui-theme="dark"] .menu-section-highlight {
    background: linear-gradient(180deg, #243645 0%, #1d2d39 100%);
}

body[data-ui-theme="dark"] button:hover {
    border-color: #566d80;
    background: var(--panel-soft);
}

body[data-ui-theme="dark"] #sidebar button:hover {
    border-color: #5b7690;
    background: linear-gradient(180deg, #2d4151 0%, #253847 100%);
}

body[data-ui-theme="dark"] [data-tool]::before {
    background: rgba(22, 33, 43, 0.98);
}

body[data-ui-theme="dark"] [data-tool]::after {
    background: rgba(22, 33, 43, 0.98);
    color: var(--text);
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.32);
}

body[data-ui-theme="dark"] .grid-system-launch {
    background: linear-gradient(180deg, #344b5e 0%, #2b3d4d 100%);
    border-color: #56748d;
    color: #e7f1fa;
}

body[data-ui-theme="dark"] .grid-system-launch-secondary,
body[data-ui-theme="dark"] .btn-preview,
body[data-ui-theme="dark"] .btn-export {
    border-color: #56748d;
    background: linear-gradient(180deg, #2d4253 0%, #253746 100%);
    color: #e7f1fa;
}

body[data-ui-theme="dark"] .btn-preview:hover,
body[data-ui-theme="dark"] .btn-export:hover {
    background: linear-gradient(180deg, #365066 0%, #2c4153 100%);
}

body[data-ui-theme="dark"] [data-tool="delete"],
body[data-ui-theme="dark"] .btn-del-axis,
body[data-ui-theme="dark"] .level-manager-button-danger {
    border-color: #6c464d;
    background: #3a2328;
    color: #ffbcc0;
}

body[data-ui-theme="dark"] .item-row.is-active,
body[data-ui-theme="dark"] .level-manager-row.is-active,
body[data-ui-theme="dark"] .system-tab-button.is-active,
body[data-ui-theme="dark"] .primary-btn {
    border-color: #6484a2;
    background: var(--accent-soft);
    color: var(--text);
}

body[data-ui-theme="dark"] .primary-btn:hover {
    border-color: #7092b0;
    background: #355166;
    color: var(--text);
}

body[data-ui-theme="dark"] .level-manager-badge {
    border-color: var(--border);
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-soft);
}

body[data-ui-theme="dark"] .model-space-theme-switch:hover {
    background: var(--model-space-chip-bg);
}

body[data-ui-theme="dark"] #language-switcher {
    background: rgba(15, 24, 32, 0.9);
    border-color: var(--border-strong);
}

body[data-ui-theme="dark"] .language-switch-button:hover {
    background: rgba(156, 198, 240, 0.12);
}

body[data-ui-theme="dark"] ::-webkit-scrollbar-thumb {
    background: #435766;
}

@media (max-width: 1100px) {
    #sidebar {
        width: 320px;
    }
}

@media (max-width: 900px) {
    html,
    body {
        overflow: auto;
    }

    #app {
        flex-direction: column;
        height: auto;
        min-height: 100vh;
    }

    #sidebar {
        width: 100%;
    }

    #mode-dock {
        width: 100%;
        flex-direction: row;
        padding: 10px;
    }

    .dock-button {
        width: auto;
        flex: 1 1 0;
        min-height: 44px;
        writing-mode: horizontal-tb;
        transform: none;
    }

    .sidebar-shell {
        height: auto;
        max-height: none;
    }

    #workspace {
        min-height: 58vh;
    }

    .grid-modal-grid,
    .grid-axis-lists {
        grid-template-columns: 1fr;
    }

    .grid-axis-lists {
        max-height: none;
    }

    .preview-content {
        width: 96vw;
        height: 88vh;
    }

    .system-modal-tabs {
        flex-wrap: wrap;
    }

    .level-manager-row {
        flex-wrap: wrap;
    }

    .level-manager-name-input {
        flex: 1 1 220px;
    }

    .level-manager-summary {
        min-width: 140px;
    }
}

@media (max-width: 640px) {
    #app {
        gap: 10px;
        padding: 10px;
    }

    .inline-row,
    .modal-actions,
    .level-manager-actions {
        flex-direction: column;
    }

    .level-manager-row {
        align-items: stretch;
    }

    .level-manager-name-input,
    .level-manager-height {
        width: 100%;
        flex-basis: 100%;
    }

    .level-manager-order {
        width: 100%;
        flex-direction: column;
        justify-content: flex-start;
    }

    .column-count-input {
        width: 100%;
        flex-basis: 100%;
    }

    .level-manager-icon-button,
    .level-manager-button,
    .levels-modal-toolbar button,
    .system-tab-button {
        width: 100%;
    }

    .axis-type-select {
        width: 100%;
    }

    .export-mode-switch {
        grid-template-columns: 1fr;
    }

    .workspace-overlay {
        inset: 10px 10px auto 10px;
    }

    .workspace-toolbar {
        width: 100%;
        flex-direction: column;
        align-items: stretch;
    }

    .model-space-theme-switch,
    .workspace-level-switch {
        width: 100%;
        justify-content: space-between;
    }

    .workspace-level-label {
        min-width: 0;
        flex: 1 1 auto;
    }

    #language-switcher {
        right: 12px;
        bottom: 12px;
    }
}