:root {
    --bg-color: #f0f2f5;
    --panel-bg: #ffffff;
    --border-color: #d0d7de;
    --accent-color: #2563eb;
    --accent-hover: #1d4ed8;
    --text-color: #24292f;
    --text-secondary: #57606a;
    --tool-hover: #f3f4f6;
    --selected-tool: #e0e7ff;
    --selected-border: #2563eb;
    --canvas-bg: #ffffff;
    --grid-color: #e1e4e8;
    --bottom-bar-height: 60px;
    --toolbar-handle-height: 48px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow: hidden;
    height: 100vh;
    height: 100svh;
    width: 100vw;
}

/* App Container */
.app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    height: 100svh;
}

/* Top Bar */
.top-bar {
    height: 48px;
    background-color: var(--panel-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    z-index: 100;
    flex-shrink: 0;
}

.logo {
    font-weight: 700;
    font-size: 18px;
    color: var(--accent-color);
    display: flex;
    align-items: center;
    gap: 8px;
}
.logo-mark {
    flex: none;
}
.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}
.logo-name {
    font-weight: 700;
    font-size: 18px;
}
.logo-tld {
    color: var(--text-secondary);
    font-weight: 600;
}
.logo-tagline {
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.2px;
    color: var(--text-secondary);
    text-transform: none;
}
.logo-beta {
    flex: none;
    align-self: flex-start;
    margin-top: 2px;
    padding: 1px 6px;
    border-radius: 999px;
    background: #fff3d6;
    color: #b3760a;
    border: 1px solid #f0c869;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.3px;
    text-transform: uppercase;
    line-height: 1.4;
}

.file-ops {
    display: flex;
    gap: 8px;
}

.btn {
    padding: 6px 12px;
    border: 1px solid var(--border-color);
    background-color: var(--panel-bg);
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-color);
    transition: all 0.15s ease;
    display: flex;
    align-items: center;
    gap: 4px;
}

.btn:hover {
    background-color: var(--bg-color);
    border-color: var(--text-secondary);
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    border-color: var(--accent-hover);
}

/* Arrange popover */
.arrange-btn-wrapper {
    position: relative;
}

.arrange-popover {
    display: none;
    flex-direction: column;
    gap: 10px;
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    min-width: 230px;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.13);
    z-index: 300;
}

.arrange-popover.visible {
    display: flex;
}

.arrange-popover-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.arrange-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.4px;
    width: 68px;
    flex-shrink: 0;
}

.arrange-toggle {
    display: flex;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    overflow: hidden;
    flex: 1;
}

.arrange-opt {
    flex: 1;
    padding: 4px 6px;
    font-size: 12px;
    font-weight: 500;
    background: none;
    border: none;
    border-right: 1px solid var(--border-color);
    cursor: pointer;
    color: var(--text-secondary);
    transition: background 0.1s, color 0.1s;
    white-space: nowrap;
}

.arrange-opt:last-child {
    border-right: none;
}

.arrange-opt:hover {
    background: var(--bg-color);
    color: var(--text-color);
}

.arrange-opt.active {
    background: var(--accent-color);
    color: #fff;
}

.arrange-row-disabled {
    opacity: 0.4;
    pointer-events: none;
}

.arrange-apply-btn {
    width: 100%;
    justify-content: center;
    margin-top: 2px;
}

/* Main Workspace */
.workspace {
    display: flex;
    flex: 1;
    overflow: hidden;
    min-height: 0;
}

/* Tool Sidebar */
.sidebar {
    width: 56px;
    background-color: var(--panel-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 8px 0;
    z-index: 50;
    overflow-y: auto;
    overflow-x: hidden;
    scrollbar-width: none;
    -ms-overflow-style: none;
    flex-shrink: 0;
}

.sidebar::-webkit-scrollbar {
    display: none;
}

.tool-btn {
    width: 40px;
    height: 40px;
    border: 1px solid transparent;
    border-radius: 8px;
    background: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 4px;
    color: var(--text-secondary);
    transition: all 0.15s ease;
    position: relative;
    flex-shrink: 0;
}

.tool-btn:hover {
    background-color: var(--tool-hover);
    color: var(--text-color);
}

.tool-btn.active {
    background-color: var(--selected-tool);
    color: var(--accent-color);
    border-color: var(--selected-border);
}

.tool-btn svg {
    width: 20px;
    height: 20px;
}

.tool-separator {
    width: 24px;
    height: 1px;
    background-color: var(--border-color);
    margin: 8px 0;
}

.tool-section-label {
    font-size: 9px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    text-align: center;
    padding: 4px 0 2px;
    width: 100%;
}

/* Canvas Area */
.canvas-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    background-color: var(--canvas-bg);
    cursor: crosshair;
    touch-action: none;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
    contain: layout style paint;
}

#mainCanvas {
    position: absolute;
    top: 0;
    left: 0;
    touch-action: none;
}

/* Properties Panel */
.properties-panel {
    width: 240px;
    background-color: var(--panel-bg);
    border-left: 1px solid var(--border-color);
    padding: 16px;
    overflow-y: auto;
    z-index: 50;
    display: none;
    flex-shrink: 0;
}

.properties-panel.visible {
    display: block;
}

.prop-group {
    margin-bottom: 16px;
}

.prop-label {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    margin-bottom: 6px;
    letter-spacing: 0.5px;
}

.prop-input {
    width: 100%;
    padding: 6px 8px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 13px;
    margin-bottom: 8px;
    background-color: var(--panel-bg);
}

.prop-input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

textarea.prop-input {
    resize: vertical;
    min-height: 60px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 12px;
    line-height: 1.5;
}

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

.prop-row .prop-input {
    flex: 1;
}

.color-picker {
    width: 32px;
    height: 32px;
    padding: 2px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
}

/* Zoom Controls */
.zoom-controls {
    position: absolute;
    bottom: 16px;
    right: calc(16px + var(--right-panel-width, 0px));
    transition: right 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    gap: 4px;
    background-color: var(--panel-bg);
    padding: 4px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    z-index: 10;
}

.zoom-btn {
    width: 28px;
    height: 28px;
    border: none;
    background: none;
    cursor: pointer;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 18px;
    line-height: 1;
}

.zoom-btn:hover {
    background-color: var(--tool-hover);
    color: var(--text-color);
}

.snap-toggle-btn {
    color: var(--text-secondary);
}

.snap-toggle-btn.active {
    background-color: var(--accent-color, #3b82f6);
    color: #fff;
}

.snap-toggle-btn.active:hover {
    background-color: var(--accent-hover, #2563eb);
    color: #fff;
}

.zoom-controls-divider {
    width: 1px;
    height: 18px;
    background-color: var(--border-color);
    margin: 0 2px;
}

.zoom-level {
    font-size: 12px;
    font-weight: 600;
    min-width: 48px;
    text-align: center;
    color: var(--text-color);
}

/* Toolbar Dropdown Menus */
.toolbar-dropdown-wrapper {
    position: relative;
    display: inline-block;
}

.toolbar-dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
    z-index: 150;
    min-width: 180px;
    padding: 4px;
    white-space: nowrap;
}

.toolbar-dropdown-menu.open {
    display: block;
}

.toolbar-dropdown-item {
    display: block;
    width: 100%;
    padding: 7px 12px;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-color);
    text-align: left;
    border-radius: 5px;
}

.toolbar-dropdown-item:hover {
    background: var(--tool-hover);
}

.toolbar-dropdown-divider {
    height: 1px;
    background: var(--border-color);
    margin: 4px 0;
}

/* File dropdown: ensure it stays within viewport on narrow screens */
#fileDropdownMenu {
    min-width: 200px;
}

/* Hidden file input */
#fileInput {
    display: none;
}

/* Toast notification */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: var(--text-color);
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    white-space: nowrap;
    max-width: 90vw;
    text-align: center;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Bottom spacer — provides layout space for the mobile fixed bottom toolbar */
.bottom-spacer {
    display: none;
    flex-shrink: 0;
}

/* Toolbar handle — only rendered on mobile */
.toolbar-handle {
    display: none;
}

/* Swipe-up capture zone — mobile only, hidden by default and when toolbox is open */
.swipe-zone {
    display: none;
}

/* Mobile label editor panel — slides in from top, only active on mobile */
.mobile-label-panel {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1100;
    transform: translateY(-100%);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    background: var(--panel-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
    padding: max(env(safe-area-inset-top, 0px), 8px) max(8px, env(safe-area-inset-right, 0px)) 8px max(8px, env(safe-area-inset-left, 0px));
}

.mobile-label-panel.visible {
    transform: translateY(0);
}

.mobile-label-inner {
    display: flex;
    align-items: center;
    gap: 8px;
    height: 44px;
}

.mobile-label-input {
    flex: 1;
    height: 40px;
    border: 1.5px solid var(--accent-color);
    border-radius: 6px;
    padding: 0 10px;
    font-size: 16px;
    outline: none;
    background: var(--bg-color);
    color: var(--text-color);
}

.mobile-label-cancel,
.mobile-label-confirm {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--panel-bg);
    cursor: pointer;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    -webkit-tap-highlight-color: transparent;
}

.mobile-label-confirm {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

/* Mobile overflow menu — hidden on desktop */
.mobile-menu-btn {
    display: none;
}

.mobile-menu {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 500;
}

.mobile-menu.open {
    display: block;
}

.mobile-menu-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.25);
}

.mobile-menu-panel {
    position: absolute;
    top: 50px;
    right: 8px;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.18);
    min-width: 200px;
    overflow: hidden;
}

.mobile-menu-item {
    display: flex;
    width: 100%;
    align-items: center;
    padding: 14px 18px;
    border: none;
    background: none;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-color);
    cursor: pointer;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    transition: background 0.12s;
    -webkit-tap-highlight-color: transparent;
}

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

.mobile-menu-item:active {
    background: var(--tool-hover);
}

/* Tablet responsive (768px) */
@media (max-width: 768px) {
    .sidebar {
        width: 48px;
    }
    .tool-btn {
        width: 36px;
        height: 36px;
    }
    .top-bar {
        height: 44px;
        padding: 0 8px;
    }
    .logo {
        font-size: 14px;
    }
    .logo-name {
        font-size: 14px;
    }
    .logo-tagline {
        display: none;
    }
    .logo-beta {
        font-size: 9px;
        padding: 0 5px;
        margin-top: 0;
        align-self: center;
    }
    .btn {
        padding: 4px 8px;
        font-size: 12px;
    }
    .properties-panel.visible {
        width: 200px;
    }
    .history-panel {
        top: 44px;
    }
    .shortcuts-panel {
        top: 44px;
    }
    .settings-panel {
        top: 44px;
    }
    .nlp-panel {
        top: 44px;
    }
}

/* History Panel */
.history-panel {
    position: absolute;
    top: 48px;
    left: -280px;
    width: 260px;
    bottom: 0;
    background: var(--panel-bg);
    border-right: 1px solid var(--border-color);
    z-index: 200;
    display: flex;
    flex-direction: column;
    transition: left 0.25s ease;
    box-shadow: 2px 0 8px rgba(0,0,0,0.1);
}

.history-panel.visible {
    left: 0;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    font-size: 14px;
}

.history-close {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0 4px;
    line-height: 1;
}

.history-close:hover {
    color: var(--text-color);
}

.history-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.history-item {
    padding: 6px 10px;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
    margin-bottom: 2px;
    transition: background 0.15s;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-item:hover {
    background: var(--tool-hover);
}

.history-done {
    color: var(--text-color);
}

.history-undone {
    color: var(--text-secondary);
    text-decoration: line-through;
    opacity: 0.6;
}

.history-active {
    background: var(--selected-tool) !important;
    font-weight: 600;
}

.history-empty {
    padding: 16px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 12px;
}

.history-actions {
    display: flex;
    gap: 8px;
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-color);
}

.history-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--panel-bg);
    color: var(--text-color);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
}

.history-btn:hover {
    background: var(--tool-hover);
    border-color: var(--accent-color);
}

.history-btn:active {
    transform: scale(0.96);
}

.history-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    border-color: var(--border-color);
}

/* Shortcuts Panel */
.shortcuts-panel {
    position: absolute;
    top: 48px;
    right: -340px;
    width: 320px;
    bottom: 0;
    background: var(--panel-bg);
    border-left: 1px solid var(--border-color);
    z-index: 200;
    display: flex;
    flex-direction: column;
    transition: right 0.25s ease;
    box-shadow: -2px 0 8px rgba(0,0,0,0.1);
}

.shortcuts-panel.visible {
    right: 0;
}

.shortcuts-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    font-size: 14px;
}

.shortcuts-close {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0 4px;
    line-height: 1;
}

.shortcuts-close:hover {
    color: var(--text-color);
}

.shortcuts-content {
    flex: 1;
    overflow-y: auto;
    padding: 12px 16px;
}

.shortcuts-section {
    margin-bottom: 16px;
}

.shortcuts-section-title {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    padding-bottom: 4px;
    border-bottom: 1px solid var(--border-color);
}

.shortcuts-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 5px 0;
    font-size: 13px;
}

.shortcuts-key {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 60px;
    padding: 3px 8px;
    background: var(--canvas-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    color: var(--text-color);
    white-space: nowrap;
}

/* Mobile-only panel nav buttons — hidden by default on desktop */
.prop-mobile-back-btn,
.prop-mobile-nav-btn {
    display: none;
}

/* ============================================================
   Mobile layout — phones and small/medium touch tablets.
   Touch-aware breakpoint: ≤600px OR any coarse-pointer device ≤1024px,
   so a phone in "Request Desktop Site" mode (which reports a ~980px
   viewport) keeps the full-width bottom toolbar instead of the desktop
   sidebar. Query is kept in sync with MOBILE_MEDIA_QUERY in js/responsive.js.
   Sidebar converts to a horizontal bottom toolbar.
   Properties panel becomes a slide-up bottom sheet.
   ============================================================ */
@media (max-width: 600px), (pointer: coarse) and (max-width: 1024px) {

    /* Use dynamic/small viewport height to avoid address-bar layout shifts */
    body {
        height: 100svh;
    }

    .app {
        height: 100svh;
    }

    /* Top bar: respect horizontal safe areas (landscape notch) */
    .top-bar {
        padding-left: max(12px, env(safe-area-inset-left));
        padding-right: max(12px, env(safe-area-inset-right));
    }

    /* Show mobile menu button, hide secondary file-op buttons */
    .mobile-menu-btn {
        display: flex !important;
        font-size: 20px;
        padding: 4px 10px;
        letter-spacing: 2px;
    }

    .file-ops .btn:not([data-mobile-keep]):not(.btn-primary):not(.mobile-menu-btn) {
        display: none;
    }

    /* Reserve space at the bottom for the collapsed toolbar handle */
    .bottom-spacer {
        display: block;
        height: calc(var(--toolbar-handle-height) + env(safe-area-inset-bottom));
        flex-shrink: 0;
    }

    /* ── Bottom toolbar drawer ───────────────────────────── */
    .sidebar {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        width: 100%;
        /* Collapsed: only the handle strip is visible */
        height: calc(var(--toolbar-handle-height) + env(safe-area-inset-bottom));
        padding: 0;
        flex-direction: column;
        align-items: center;
        overflow: hidden;
        border-right: none;
        border-top: 1px solid var(--border-color);
        z-index: 200;
        box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.08);
        transition: height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        scrollbar-width: none;
        -ms-overflow-style: none;
    }

    .sidebar::-webkit-scrollbar {
        display: none;
    }

    /* Expanded: drawer fills 1/3 of the screen from the bottom */
    .sidebar.open {
        height: calc(33vh + env(safe-area-inset-bottom));
        overflow-y: auto;
        flex-direction: row;
        flex-wrap: wrap;
        align-items: flex-start;
        align-content: flex-start;
        justify-content: center;
        padding: 0 max(8px, env(safe-area-inset-right)) calc(env(safe-area-inset-bottom) + 8px) max(8px, env(safe-area-inset-left));
        gap: 6px;
        -webkit-overflow-scrolling: touch;
    }

    /* Handle strip — grip pill that the user taps to expand/collapse */
    .toolbar-handle {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        height: var(--toolbar-handle-height);
        flex-shrink: 0;
        background: transparent;
        border: none;
        padding: 0;
        cursor: pointer;
        -webkit-tap-highlight-color: transparent;
        /* When expanded the handle must stay at the top */
        order: -1;
    }

    .toolbar-handle-grip {
        display: block;
        width: 56px;
        height: 5px;
        background: var(--border-color);
        border-radius: 3px;
        transition: background 0.15s;
    }

    .toolbar-handle:active .toolbar-handle-grip {
        background: var(--text-secondary);
    }

    /* Swipe-up capture zone — sits above the collapsed handle, hidden when toolbox is open */
    .swipe-zone {
        display: block;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        height: calc(var(--toolbar-handle-height) + env(safe-area-inset-bottom) + 20px);
        z-index: 210;
        touch-action: none;
        background: transparent;
    }
    .swipe-zone.hidden {
        display: none;
    }

    /* Section labels have no place in the horizontal toolbar.
       !important guards against any accidental override that
       would let a width:100% label fill the scroll container
       and push all buttons off-screen. */
    .tool-section-label {
        display: none !important;
    }

    /* Bigger touch targets (44px Apple HIG minimum) */
    .tool-btn {
        width: 44px;
        height: 44px;
        margin-bottom: 0;
        margin-right: 0;
        flex-shrink: 0;
    }

    .tool-btn svg {
        width: 22px;
        height: 22px;
    }

    /* Mobile label editor panel — shown when editing labels */
    .mobile-label-panel {
        display: block;
    }

    /* ── Properties bottom sheet ─────────────────────────── */
    .properties-panel {
        position: fixed !important;
        left: 0 !important;
        right: 0 !important;
        bottom: calc(var(--toolbar-handle-height) + env(safe-area-inset-bottom)) !important;
        top: auto !important;
        width: 100% !important;
        max-height: 70vh !important;
        max-height: min(70dvh, calc(100svh - var(--toolbar-handle-height) - 56px - env(safe-area-inset-bottom))) !important;
        border-left: none !important;
        border-top: 1px solid var(--border-color) !important;
        border-radius: 14px 14px 0 0 !important;
        display: block !important;
        transform: translateY(calc(100% + var(--toolbar-handle-height) + env(safe-area-inset-bottom) + 8px)) !important;
        transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1) !important;
        overflow-y: auto !important;
        overscroll-behavior: contain;
        -webkit-overflow-scrolling: touch;
        box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.12) !important;
        z-index: 300 !important;
        padding: 0 16px calc(20px + env(safe-area-inset-bottom)) !important;
        pointer-events: none;
    }

    /* Drag handle pill */
    .properties-panel::before {
        content: '';
        display: block;
        width: 36px;
        height: 4px;
        background: var(--border-color);
        border-radius: 2px;
        margin: 10px auto 12px;
        flex-shrink: 0;
    }

    .properties-panel.visible {
        transform: translateY(0) !important;
        pointer-events: auto;
    }

    /* ── Zoom controls: fixed above the collapsed handle ────
       position:fixed keeps them viewport-relative so they can't
       overlap the toolbar even if canvas-container height differs. */
    .zoom-controls {
        position: fixed;
        bottom: calc(var(--toolbar-handle-height) + env(safe-area-inset-bottom) + 12px);
        right: 12px;
        z-index: 90;
    }

    body.has-open-prop-panel .zoom-controls {
        opacity: 0;
        pointer-events: none;
    }

    .zoom-btn {
        width: 36px;
        height: 36px;
    }

    /* ── Toast: above the handle ────────────────────────── */
    .toast {
        bottom: calc(var(--toolbar-handle-height) + env(safe-area-inset-bottom) + 12px);
    }

    /* ── History panel: full-width on mobile ─────────────── */
    .history-panel {
        width: 100%;
        left: -100vw;
        top: 44px;
        bottom: calc(var(--toolbar-handle-height) + env(safe-area-inset-bottom));
    }

    .history-panel.visible {
        left: 0;
    }

    /* ── Shortcuts panel: full-width on mobile ───────────── */
    .shortcuts-panel {
        width: 100%;
        right: -100vw;
        top: 44px;
        bottom: calc(var(--toolbar-handle-height) + env(safe-area-inset-bottom));
    }

    .shortcuts-panel.visible {
        right: 0;
    }

    /* ── Settings panel: full-screen slide-in on mobile ──── */
    .settings-panel {
        top: 0;
        width: 100%;
    }

    /* ── NLP panel: full-screen slide-in from right on mobile ── */
    .nlp-panel {
        top: 0;
        width: 100%;
        border-left: none;
        z-index: 500;
    }

    .nlp-footer {
        flex-wrap: wrap;
    }

    .nlp-replace-label {
        font-size: 11px;
    }

    /* ── Textareas: compact on mobile so they fit the sheet ── */
    #entityFields,
    #swimlaneLanes,
    #classboxAttributes,
    #classboxMethods {
        height: 72px;
        min-height: 72px;
        resize: none;
    }

    #classboxPanel .prop-group:nth-of-type(2) {
        position: sticky;
        top: 0;
        z-index: 2;
        margin: -2px 0 12px;
        padding: 8px 0;
        background: var(--panel-bg);
        border-bottom: 1px solid var(--border-color);
    }

    #connectorPanel {
        display: flex !important;
        flex-direction: column;
    }

    #connectorBackBtn {
        order: -2;
    }

    #connectorPanel .prop-group:nth-of-type(4) {
        order: -1;
        position: sticky;
        top: 0;
        z-index: 2;
        margin: -2px 0 12px;
        padding: 8px 0 12px;
        background: var(--panel-bg);
        border-bottom: 1px solid var(--border-color);
    }

    /* ── Mobile panel navigation buttons ─────────────────── */
    .prop-mobile-back-btn {
        display: flex;
        align-items: center;
        gap: 4px;
        width: 100%;
        padding: 10px 0 14px;
        margin-bottom: 4px;
        border: none;
        border-bottom: 1px solid var(--border-color);
        background: transparent;
        color: #2563eb;
        font-size: 14px;
        font-weight: 500;
        cursor: pointer;
        text-align: left;
        -webkit-tap-highlight-color: transparent;
    }

    .prop-mobile-nav-btn {
        display: block;
        width: 100%;
        padding: 11px;
        border: 1px solid var(--border-color);
        border-radius: 8px;
        background: transparent;
        color: var(--text-color);
        font-size: 14px;
        font-weight: 500;
        cursor: pointer;
        text-align: center;
        -webkit-tap-highlight-color: transparent;
    }
}

/* ---- Cloud Save Status Dot ---- */
.cloud-save-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border-color);
    flex-shrink: 0;
    transition: background 0.3s;
    align-self: center;
}
.cloud-save-dot.saving { background: #f59e0b; }
.cloud-save-dot.saved  { background: #22c55e; }
.cloud-save-dot.error  { background: #ef4444; }
.cloud-save-dot.idle   { background: var(--border-color); }

/* ---- Premium Button Active State ---- */
.btn.premium-active {
    background-color: #f0fdf4;
    border-color: #22c55e;
    color: #16a34a;
}
.btn.premium-active:hover {
    background-color: #dcfce7;
    border-color: #16a34a;
}

/* ---- Cloud Diagram Dialog ---- */
.cloud-dialog-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}
.cloud-dialog {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    max-width: 400px;
    width: calc(100% - 32px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.18);
}
.cloud-dialog-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-color);
}
.cloud-dialog-body {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.5;
}
.cloud-dialog-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 14px;
}
.cloud-dialog-actions .btn {
    justify-content: center;
    width: 100%;
}
.cloud-dialog-note {
    font-size: 11px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ---- Diagram list (inside Premium panel) ---- */
.diagram-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 8px;
    max-height: 300px;
    overflow-y: auto;
}
.diagram-list-empty {
    font-size: 12px;
    color: var(--text-secondary);
    padding: 10px 0;
    text-align: center;
}
.diagram-list-item {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    padding: 8px 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-color);
    gap: 8px;
}
.diagram-list-item--active {
    border-color: #22c55e;
    background: #f0fdf4;
}
.diagram-list-item { cursor: grab; }
.diagram-list-item--dragging { opacity: 0.5; cursor: grabbing; }
.diagram-list-item-info {
    flex: 1;
    min-width: 0;
}
.diagram-list-item-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-color);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.diagram-list-item-meta {
    font-size: 11px;
    color: var(--text-secondary);
    margin-top: 2px;
}
.diagram-list-item-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 4px;
}
.diagram-list-item-badge {
    font-size: 10px;
    color: #16a34a;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 2px 6px;
    border: 1px solid #22c55e;
    border-radius: 3px;
    background: #dcfce7;
}
.diagram-open-btn,
.diagram-delete-btn {
    font-size: 11px;
    padding: 3px 8px;
}
.diagram-delete-btn {
    color: #dc2626;
}
.diagram-history-btn,
.diagram-tags-btn {
    font-size: 12px;
    padding: 3px 6px;
}
.diagram-list-item-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: 4px;
}
.doc-folder-select {
    font-size: 11px;
    padding: 2px 4px;
    max-width: 96px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: #fff;
}

/* ---- Library: search / sort controls ---- */
.library-controls {
    display: flex;
    gap: 6px;
    margin: 8px 0 6px;
}
.library-search { flex: 1; min-width: 0; font-size: 12px; }
.library-sort   { flex-shrink: 0; width: 120px; font-size: 12px; }

/* ---- Tag chips + filter bar ---- */
.tag-chip {
    display: inline-flex;
    align-items: center;
    font-size: 10px;
    line-height: 1;
    padding: 3px 6px;
    border-radius: 10px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
}
.tag-chip:hover { border-color: var(--accent-color); color: var(--accent-color); }
.tag-chip--active {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: #fff;
}
.tag-filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
    margin-bottom: 8px;
}
.tag-clear-btn { font-size: 11px; padding: 2px 8px; }

/* ---- Folder tree ---- */
.folder-tree {
    display: flex;
    flex-direction: column;
    margin-bottom: 8px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    overflow: hidden;
    max-height: 220px;
    overflow-y: auto;
}
.folder-row {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 5px 8px;
    font-size: 12px;
    cursor: pointer;
    border-bottom: 1px solid var(--bg-color);
}
.folder-row:last-child { border-bottom: none; }
.folder-row:hover { background: var(--bg-color); }
.folder-row--active { background: #eff6ff; color: var(--accent-color); font-weight: 600; }
.folder-row--drop {
    background: #dbeafe;
    box-shadow: inset 0 0 0 2px var(--accent-color);
}
.folder-row-name { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.folder-row-count {
    font-size: 10px;
    color: var(--text-secondary);
    background: var(--bg-color);
    border-radius: 8px;
    padding: 1px 6px;
    flex-shrink: 0;
}
.folder-toggle {
    width: 12px;
    flex-shrink: 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 10px;
}
.folder-toggle--leaf { visibility: hidden; }
.folder-row-actions {
    display: none;
    gap: 2px;
    flex-shrink: 0;
}
.folder-row:hover .folder-row-actions { display: flex; }
.folder-act {
    border: none;
    background: none;
    cursor: pointer;
    font-size: 11px;
    padding: 1px 3px;
    color: var(--text-secondary);
    border-radius: 3px;
}
.folder-act:hover { background: var(--border-color); color: var(--text-color); }

/* ---- Version history modal ---- */
.version-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
}
.version-modal {
    background: var(--panel-bg, #fff);
    border-radius: 10px;
    width: min(520px, 100%);
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
    overflow: hidden;
}
.version-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    font-size: 14px;
}
.version-modal-close {
    border: none;
    background: none;
    font-size: 16px;
    cursor: pointer;
    color: var(--text-secondary);
}
.version-modal-list {
    overflow-y: auto;
    padding: 8px;
}
.version-empty {
    padding: 24px 16px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 13px;
}
.version-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 8px 10px;
    border-radius: 6px;
}
.version-row:hover { background: var(--bg-color); }
.version-row-info { flex: 1; min-width: 0; }
.version-row-name { font-size: 13px; font-weight: 500; }
.version-row-meta { font-size: 11px; color: var(--text-secondary); margin-top: 2px; }
.version-row-actions { display: flex; gap: 4px; flex-shrink: 0; }
.version-row-actions .btn { font-size: 11px; padding: 3px 7px; }
.version-restore { color: var(--accent-color); }
.version-del { color: #dc2626; }

/* ---- AI Settings Panel (repurposed as Premium Panel) ---- */
.settings-panel {
    position: fixed;
    top: 48px;
    right: 0;
    bottom: 0;
    width: 300px;
    background: var(--panel-bg);
    border-left: 1px solid var(--border-color);
    z-index: 300;
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: -4px 0 20px rgba(0,0,0,0.1);
    overflow: hidden;
}

.settings-panel.open {
    transform: translateX(0);
}

.settings-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    font-size: 14px;
    flex-shrink: 0;
}

.settings-status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border-color);
    margin-left: auto;
    flex-shrink: 0;
    transition: background 0.2s;
}

.settings-status-dot.configured {
    background: #22c55e;
}

.settings-close {
    background: none;
    border: none;
    font-size: 16px;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 2px 4px;
    border-radius: 4px;
    line-height: 1;
    flex-shrink: 0;
}

.settings-close:hover {
    color: var(--text-color);
    background: var(--tool-hover);
}

.settings-body {
    padding: 16px;
    overflow-y: auto;
    flex: 1;
}

.settings-note {
    font-size: 11px;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 16px;
    padding: 8px 10px;
    background: var(--bg-color);
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

/* ---- NLP Chat Panel ---- */
.nlp-panel {
    position: fixed;
    top: 48px;
    right: 0;
    bottom: 0;
    width: 360px;
    background: var(--panel-bg);
    border-left: 1px solid var(--border-color);
    box-shadow: -4px 0 20px rgba(0,0,0,0.1);
    z-index: 200;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: translateX(100%);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.nlp-panel.open {
    transform: translateX(0);
}

.nlp-header {
    display: flex;
    align-items: center;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
    font-size: 13px;
    background: var(--bg-color);
    cursor: default;
    gap: 6px;
}

.assistant-header-left {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
    min-width: 0;
}

.assistant-title {
    font-weight: 600;
    font-size: 13px;
    white-space: nowrap;
}

.assistant-tabs {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    padding: 2px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--panel-bg);
    flex-shrink: 0;
}

.assistant-tab {
    background: transparent !important;
    border: none !important;
    border-radius: 4px !important;
    color: var(--text-secondary) !important;
    cursor: pointer;
    font-size: 12px !important;
    font-weight: 500;
    line-height: 1;
    padding: 5px 8px !important;
}

.assistant-tab:hover {
    background: var(--tool-hover) !important;
    color: var(--text-color) !important;
}

.assistant-tab.active {
    background: var(--selected-tool) !important;
    color: var(--accent-color) !important;
    font-weight: 600;
}

.nlp-header button {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 11px;
    color: var(--text-secondary);
    padding: 2px 4px;
    border-radius: 4px;
}

.nlp-header button:last-child {
    margin-left: auto;
}

.nlp-reset-btn {
    font-size: 14px !important;
}

.nlp-header button:hover {
    background: var(--tool-hover);
    color: var(--text-color);
}

.nlp-body {
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
    min-height: 0;
    overflow-y: auto;
}

/* Chat message thread */
.nlp-chat {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 2px 0;
}

.nlp-msg {
    font-size: 13px;
    line-height: 1.5;
    padding: 8px 10px;
    border-radius: 8px;
    max-width: 88%;
    word-wrap: break-word;
}

.nlp-msg.user {
    align-self: flex-end;
    background: var(--accent-color);
    color: #fff;
}

.nlp-msg.assistant {
    align-self: flex-start;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
}

/* Running summary */
.nlp-summary {
    border: 1px solid var(--border-color);
    border-radius: 6px;
    overflow: hidden;
}

.nlp-summary-header {
    padding: 5px 10px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-secondary);
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
}

.nlp-summary-content {
    padding: 8px 10px;
    max-height: 130px;
    overflow-y: auto;
    font-size: 12px;
    line-height: 1.7;
    color: var(--text-color);
    white-space: pre-wrap;
    font-family: inherit;
}

/* Input row: textarea + mic side by side */
.nlp-input-row {
    display: flex;
    gap: 6px;
    align-items: flex-end;
}

.nlp-input-row .nlp-textarea {
    flex: 1;
}

.nlp-textarea {
    width: 100%;
    padding: 8px 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 13px;
    font-family: inherit;
    line-height: 1.5;
    resize: none;
    background: var(--bg-color);
    color: var(--text-color);
}

.nlp-textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

.nlp-footer {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nlp-replace-label {
    font-size: 12px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    flex: 1;
}

.nlp-mode-select {
    font-size: 12px;
    padding: 5px 8px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--panel-bg);
    color: var(--text-color);
    cursor: pointer;
}

.nlp-mic-btn {
    padding: 6px 10px;
    flex-shrink: 0;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.nlp-mic-btn.recording {
    background: #dc2626;
    border-color: #dc2626;
    color: white;
    animation: nlp-mic-pulse 1.4s ease infinite;
}

.nlp-mic-btn.transcribing {
    opacity: 0.5;
    cursor: not-allowed;
}

@keyframes nlp-mic-pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(220, 38, 38, 0.45); }
    50%       { box-shadow: 0 0 0 6px rgba(220, 38, 38, 0); }
}

/* ---- Mermaid Import/Export Modals ---- */
.mermaid-modal-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.45);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}
.mermaid-modal {
    background: var(--bg-color, #fff);
    border-radius: 10px;
    box-shadow: 0 8px 40px rgba(0,0,0,0.22);
    width: min(660px, 96vw);
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.mermaid-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    font-weight: 600;
    font-size: 15px;
    border-bottom: 1px solid var(--border-color, #e5e7eb);
}
.mermaid-modal-close {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: var(--text-secondary, #6b7280);
    line-height: 1;
    padding: 2px 6px;
    border-radius: 4px;
}
.mermaid-modal-close:hover { background: var(--hover-bg, #f3f4f6); }
.mermaid-modal-body {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 16px 18px;
    overflow-y: auto;
}
.mermaid-hint { margin: 0; font-size: 13px; color: var(--text-secondary, #6b7280); }
.mermaid-export-warning {
    font-size: 13px;
    color: #92400e;
    background: #fef3c7;
    border: 1px solid #fcd34d;
    border-radius: 6px;
    padding: 8px 12px;
}
.mermaid-hint code { font-family: monospace; background: var(--hover-bg, #f3f4f6); padding: 1px 5px; border-radius: 3px; }
.mermaid-textarea {
    width: 100%;
    min-height: 220px;
    font-family: 'Courier New', monospace;
    font-size: 13px;
    border: 1px solid var(--border-color, #e5e7eb);
    border-radius: 6px;
    padding: 10px;
    resize: vertical;
    box-sizing: border-box;
    background: var(--input-bg, #fff);
    color: var(--text-color, #111);
    line-height: 1.5;
}
.mermaid-modal-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}
.mermaid-mode-radio {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 13px;
    cursor: pointer;
}

/* ---- Mermaid Mode Badge ---- */
.mermaid-mode-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #1d4ed8;
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    padding: 4px 10px 4px 12px;
    border-radius: 20px;
    white-space: nowrap;
}
.mermaid-mode-exit {
    background: rgba(255,255,255,0.25);
    border: none;
    color: #fff;
    cursor: pointer;
    font-size: 14px;
    border-radius: 50%;
    width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    line-height: 1;
}
.mermaid-mode-exit:hover { background: rgba(255,255,255,0.4); }

/* ---- AI Advisor Panel ---- */
.advisor-panel {
    position: fixed;
    top: 48px;
    right: 0;
    bottom: 0;
    width: 360px;
    background: var(--panel-bg);
    border-left: 1px solid var(--border-color);
    box-shadow: -4px 0 20px rgba(0,0,0,0.1);
    z-index: 200;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: translateX(100%);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}
.advisor-panel.open {
    transform: translateX(0);
}
.advisor-header {
    display: flex;
    align-items: center;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-color);
    gap: 6px;
    flex-shrink: 0;
}
.advisor-header-left {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
    min-width: 0;
}
.advisor-title {
    font-weight: 600;
    font-size: 13px;
    white-space: nowrap;
}
.advisor-architect-badge {
    font-size: 11px;
    font-weight: 500;
    color: #1d4ed8;
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    padding: 2px 8px;
    border-radius: 10px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.advisor-icon-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
    padding: 3px 5px;
    border-radius: 4px;
    line-height: 1;
    flex-shrink: 0;
}
.advisor-icon-btn:hover {
    color: var(--text-color);
    background: var(--tool-hover);
}
.advisor-body {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
    padding: 10px 12px;
    gap: 8px;
}
.advisor-chat {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 2px 0;
}
.advisor-msg {
    font-size: 13px;
    line-height: 1.55;
    padding: 9px 11px;
    border-radius: 8px;
    max-width: 90%;
    word-wrap: break-word;
    white-space: pre-wrap;
}
.advisor-msg.assistant {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    align-self: flex-start;
}
.advisor-msg.user {
    background: #1d4ed8;
    color: #fff;
    align-self: flex-end;
}
.advisor-suggestion {
    background: #f0fdf4;
    border: 1px solid #86efac;
    border-radius: 8px;
    padding: 10px 12px;
    display: flex;
    flex-direction: column;
    gap: 5px;
    align-self: flex-start;
    max-width: 94%;
}
.advisor-suggestion-title {
    font-size: 12px;
    font-weight: 600;
    color: #166534;
}
.advisor-suggestion-desc {
    font-size: 12px;
    color: #15803d;
    line-height: 1.45;
}
.advisor-suggestion-btn {
    margin-top: 4px;
    font-size: 12px;
    padding: 4px 10px;
    background: #16a34a;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    align-self: flex-start;
}
.advisor-suggestion-btn:hover {
    background: #15803d;
}
.advisor-suggestion-actions {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-top: 4px;
}
.advisor-suggestion-actions .advisor-suggestion-btn {
    margin-top: 0;
}
.advisor-suggestion-btn-secondary {
    background: transparent;
    color: #166534;
    border: 1px solid #86efac;
}
.advisor-suggestion-btn-secondary:hover {
    background: #dcfce7;
}

/* ---- Build-prompt card (starting prompt for an AI coding agent) ---- */
.advisor-buildprompt-btn {
    font-size: 12px;
    padding: 5px 10px;
}
.advisor-buildprompt-card {
    background: #eef2ff;
    border: 1px solid #c7d2fe;
    border-radius: 8px;
    padding: 10px 12px;
    display: flex;
    flex-direction: column;
    gap: 7px;
    align-self: stretch;
    max-width: 100%;
}
.advisor-buildprompt-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 8px;
}
.advisor-buildprompt-label {
    font-size: 12px;
    font-weight: 600;
    color: #3730a3;
}
.advisor-buildprompt-name {
    font-size: 11px;
    color: #4f46e5;
    text-align: right;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.advisor-buildprompt-hint {
    font-size: 11px;
    color: #4338ca;
    line-height: 1.45;
}
.advisor-buildprompt-body {
    margin: 0;
    max-height: 300px;
    overflow-y: auto;
    background: var(--bg-color, #fff);
    border: 1px solid #c7d2fe;
    border-radius: 6px;
    padding: 9px 10px;
    font-family: 'Courier New', monospace;
    font-size: 11.5px;
    line-height: 1.5;
    white-space: pre-wrap;
    word-wrap: break-word;
    color: var(--text-color, #1e1b4b);
}
.advisor-buildprompt-actions {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}
.advisor-buildprompt-actions .advisor-suggestion-btn {
    margin-top: 0;
    background: #4f46e5;
}
.advisor-buildprompt-actions .advisor-suggestion-btn:hover {
    background: #4338ca;
}
.advisor-buildprompt-actions .advisor-suggestion-btn-secondary {
    background: transparent;
    color: #3730a3;
    border: 1px solid #c7d2fe;
}
.advisor-buildprompt-actions .advisor-suggestion-btn-secondary:hover {
    background: #e0e7ff;
}

/* ---- Amend review bar ---- */
.amend-bar {
    position: absolute;
    top: 14px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 60;
    display: flex;
    align-items: center;
    gap: 18px;
    max-width: calc(100% - 32px);
    padding: 10px 14px;
    background: var(--panel-bg, #ffffff);
    border: 1px solid var(--border-color, #d1d5db);
    border-radius: 10px;
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.18);
    font-size: 13px;
}
.amend-bar-title {
    font-weight: 600;
    font-size: 13px;
}
.amend-bar-summary {
    color: var(--text-secondary, #475569);
    font-size: 12px;
    margin-top: 1px;
}
.amend-bar-legend {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 5px;
    flex-wrap: wrap;
}
.amend-key {
    font-size: 11px;
    font-weight: 600;
    padding: 1px 7px;
    border-radius: 999px;
    border: 1px solid transparent;
}
.amend-key-add    { color: #166534; background: #dcfce7; border-color: #86efac; }
.amend-key-rename { color: #92400e; background: #fef3c7; border-color: #fcd34d; }
.amend-key-remove { color: #991b1b; background: #fee2e2; border-color: #fca5a5; }
.amend-bar-hint {
    font-size: 11px;
    color: var(--text-secondary, #64748b);
}
.amend-bar-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}
@media (max-width: 600px), (pointer: coarse) and (max-width: 1024px) {
    .amend-bar {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
        top: 8px;
    }
    .amend-bar-actions { justify-content: flex-end; }
}
.advisor-input-row {
    flex-shrink: 0;
}
.advisor-textarea {
    width: 100%;
    box-sizing: border-box;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 8px 10px;
    font-size: 13px;
    font-family: inherit;
    resize: none;
    background: var(--input-bg, #fff);
    color: var(--text-color);
    line-height: 1.45;
}
.advisor-textarea:focus {
    outline: none;
    border-color: #1d4ed8;
}
.advisor-footer {
    display: flex;
    justify-content: flex-end;
    flex-shrink: 0;
}

@media (max-width: 600px), (pointer: coarse) and (max-width: 1024px) {
    .nlp-panel,
    .advisor-panel {
        top: 0;
        width: 100%;
        z-index: 500;
        border-left: none;
    }
}

/* Advanced shapes toggle */
.advanced-toggle {
    cursor: pointer;
    user-select: none;
}

.advanced-toggle:hover {
    color: var(--text-color);
    background-color: var(--tool-hover);
}

#advancedShapes {
    width: 100%;
}

/* ---- Collaboration: sync indicator + join modal ---- */
.collab-indicator {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--text-secondary, #555);
    padding: 0 6px;
    white-space: nowrap;
}
.collab-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #9ca3af;
    flex-shrink: 0;
}
.collab-dot.synced  { background: #22c55e; }
.collab-dot.syncing { background: #3b82f6; animation: collab-pulse 1s ease-in-out infinite; }
.collab-dot.offline { background: #ef4444; }
@keyframes collab-pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.3; } }

/* Lag warning: shown when this client falls far enough behind to hold up compaction (§9). */
.collab-lag-warning {
    position: fixed;
    top: 56px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10001;
    display: flex;
    align-items: center;
    gap: 12px;
    max-width: 90vw;
    padding: 8px 12px;
    font-size: 13px;
    color: #7c2d12;
    background: #fef3c7;
    border: 1px solid #f59e0b;
    border-radius: 8px;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
}
.collab-lag-resync {
    flex-shrink: 0;
    padding: 4px 10px;
    font-size: 12px;
    font-weight: 600;
    color: #fff;
    background: #f59e0b;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}
.collab-lag-resync:hover { background: #d97706; }

.join-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
}
.join-card {
    background: var(--panel-bg, #fff);
    border-radius: 10px;
    padding: 22px;
    width: 320px;
    max-width: calc(100vw - 32px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}
.join-title {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 14px;
    color: var(--text-color, #111);
}
.join-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary, #555);
    margin: 10px 0 4px;
}
.join-error {
    color: #dc2626;
    font-size: 12px;
    min-height: 16px;
    margin-top: 8px;
}
.join-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 14px;
}

/* ---- Terms of Service gate ---- */
.tos-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 11000;
    padding: 16px;
}
/* While the gate is up, lock the page behind it from scrolling. */
body.tos-locked {
    overflow: hidden;
}
.tos-card {
    background: var(--panel-bg, #fff);
    border-radius: 12px;
    width: 560px;
    max-width: 100%;
    max-height: calc(100vh - 32px);
    display: flex;
    flex-direction: column;
    box-shadow: 0 18px 60px rgba(0, 0, 0, 0.35);
    overflow: hidden;
}
.tos-card-header {
    padding: 22px 24px 14px;
    border-bottom: 1px solid var(--border-color, #e5e7eb);
}
.tos-badge {
    display: inline-block;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: #fff;
    background: var(--accent-color, #2563eb);
    border-radius: 999px;
    padding: 3px 10px;
    margin-bottom: 10px;
}
.tos-title {
    font-size: 22px;
    font-weight: 700;
    margin: 0;
    color: var(--text-color, #111);
}
.tos-subtitle {
    font-size: 13px;
    color: var(--text-secondary, #555);
    margin: 6px 0 0;
}
.tos-version {
    font-size: 11px;
    color: var(--text-secondary, #6b7280);
    margin: 4px 0 0;
    font-variant-numeric: tabular-nums;
}
.tos-body {
    padding: 18px 24px;
    overflow-y: auto;
    font-size: 13.5px;
    line-height: 1.6;
    color: var(--text-color, #1f2937);
}
.tos-body h2 {
    font-size: 14px;
    font-weight: 700;
    margin: 18px 0 4px;
    color: var(--text-color, #111);
}
.tos-body p {
    margin: 0 0 8px;
}
.tos-body ul {
    margin: 0 0 8px;
    padding-left: 20px;
}
.tos-body li {
    margin: 0 0 4px;
}
.tos-divider {
    border: none;
    border-top: 1px solid var(--border-color, #e5e7eb);
    margin: 22px 0 16px;
}
.tos-section-heading {
    font-size: 18px !important;
    font-weight: 700;
    margin: 0 0 8px !important;
}
.tos-callout {
    background: #fff7ed;
    border: 1px solid #fdba74;
    border-radius: 8px;
    padding: 12px 14px;
    margin-bottom: 6px;
    color: #7c2d12;
    font-size: 13px;
    line-height: 1.55;
}
.tos-footer {
    padding: 14px 24px 18px;
    border-top: 1px solid var(--border-color, #e5e7eb);
    background: var(--bg-color, #f9fafb);
}
.tos-agree-row {
    display: flex;
    align-items: flex-start;
    gap: 9px;
    font-size: 13px;
    color: var(--text-color, #111);
    cursor: pointer;
    margin-bottom: 12px;
}
.tos-agree-row input {
    margin-top: 2px;
    flex-shrink: 0;
}
.tos-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}
.tos-reopen-link {
    position: fixed;
    left: 10px;
    bottom: 8px;
    z-index: 9000;
    background: transparent;
    border: none;
    padding: 4px 6px;
    font-size: 11px;
    color: var(--text-secondary, #6b7280);
    text-decoration: underline;
    cursor: pointer;
    opacity: 0.7;
}
.tos-reopen-link:hover {
    opacity: 1;
}

/* ---- Align & distribute popover ---- */
.align-grid {
    display: flex;
    gap: 4px;
    flex: 1;
    flex-wrap: wrap;
}
.align-opt {
    flex: 1 0 auto;
    min-width: 34px;
    padding: 5px 8px;
    font-size: 15px;
    line-height: 1;
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: background 0.1s, color 0.1s;
}
.align-opt:hover {
    background: var(--accent-color);
    color: #fff;
}

/* ---- AI Import panel ---- */
.ai-import-textarea {
    width: 100%;
    min-height: 200px;
    resize: vertical;
    font-family: 'Courier New', monospace;
    font-size: 12px;
    margin-bottom: 8px;
}
.ai-import-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 12px;
}
.ai-import-bytes {
    font-size: 12px;
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
}
.ai-import-bytes.over-limit {
    color: #dc2626;
    font-weight: 600;
}
.ai-import-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin: 4px 0 8px;
}
.ai-import-chip {
    padding: 5px 12px;
    font-size: 12px;
    font-weight: 500;
    background: var(--bg-color);
    border: 1px solid var(--accent-color);
    border-radius: 14px;
    color: var(--accent-color);
    cursor: pointer;
    transition: background 0.1s, color 0.1s;
}
.ai-import-chip:hover {
    background: var(--accent-color);
    color: #fff;
}

/* ---- Mobile: align/distribute popover becomes a centred sheet ---- */
@media (max-width: 600px), (pointer: coarse) and (max-width: 1024px) {
    .align-popover {
        position: fixed;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        min-width: 280px;
        max-width: calc(100vw - 32px);
        z-index: 4000;
        box-shadow: 0 8px 40px rgba(0, 0, 0, 0.3);
    }
    .align-popover.align-popover { /* keep specificity over desktop top/left */
        top: 50%;
        left: 50%;
    }
    .align-grid { gap: 8px; }
    .align-opt {
        min-width: 48px;
        min-height: 44px;
        font-size: 20px;
    }
}

/* ===================== Support / Report an issue ===================== */
/* Entry point button at the top of the Help (?) panel */
.shortcuts-support { padding-bottom: 4px; }
.shortcuts-support-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    text-align: left;
    padding: 12px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--selected-tool);
    color: var(--text-color);
    cursor: pointer;
    font: inherit;
    transition: background .12s, border-color .12s;
}
.shortcuts-support-btn:hover { background: #d7e0ff; border-color: var(--accent-color); }
.shortcuts-support-icon { font-size: 22px; line-height: 1; }
.shortcuts-support-text { display: flex; flex-direction: column; }
.shortcuts-support-title { font-weight: 600; font-size: 14px; }
.shortcuts-support-sub { font-size: 12px; color: var(--text-secondary); }
.shortcuts-terms-link {
    display: block;
    width: 100%;
    margin-top: 8px;
    padding: 0;
    border: none;
    background: none;
    text-align: center;
    color: var(--text-secondary);
    font: inherit;
    font-size: 12px;
    text-decoration: underline;
    cursor: pointer;
}
.shortcuts-terms-link:hover { color: var(--accent-color); }

/* Modal reuses .mermaid-modal-backdrop / .mermaid-modal structure */
.support-backdrop.visible { display: flex; }
.support-modal { width: min(560px, 96vw); }
.support-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-color);
    margin-top: 6px;
}
.support-req { color: #dc2626; }
.support-opt { font-weight: 400; color: var(--text-secondary); font-size: 12px; }
.support-input,
.support-textarea {
    width: 100%;
    border: 1px solid var(--border-color, #e5e7eb);
    border-radius: 6px;
    padding: 9px 11px;
    font: inherit;
    font-size: 14px;
    background: var(--input-bg, #fff);
    color: var(--text-color, #111);
    box-sizing: border-box;
}
.support-textarea { min-height: 120px; resize: vertical; line-height: 1.5; }
.support-input:focus,
.support-textarea:focus { outline: none; border-color: var(--accent-color); box-shadow: 0 0 0 2px rgba(37,99,235,.15); }

.support-drop { border: 1px dashed var(--border-color); border-radius: 8px; padding: 10px 12px; }
.support-filelist { display: flex; flex-direction: column; gap: 5px; margin-top: 8px; }
.support-file {
    display: flex; align-items: center; gap: 8px;
    background: var(--tool-hover); border-radius: 6px; padding: 5px 8px; font-size: 13px;
}
.support-file-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.support-file-size { color: var(--text-secondary); font-size: 12px; }
.support-file-x {
    border: 0; background: none; color: var(--text-secondary); cursor: pointer;
    font-size: 16px; line-height: 1; padding: 0 4px; border-radius: 4px;
}
.support-file-x:hover { background: #fee2e2; color: #dc2626; }
.support-file-total { font-size: 12px; color: var(--text-secondary); text-align: right; }

.support-captcha {
    display: flex; flex-direction: column; gap: 8px;
    font-size: 13px; color: var(--text-secondary);
    background: var(--tool-hover); border-radius: 6px; padding: 10px;
}
.support-captcha-row { display: flex; align-items: center; gap: 10px; }
.support-captcha-img {
    width: 200px; height: 70px; flex: none;
    border-radius: 6px; overflow: hidden; background: #0b0d12;
    display: flex; align-items: center; justify-content: center;
}
.support-captcha-img svg { display: block; width: 200px; height: 70px; }
.support-captcha-loading { color: #8b93a7; font-size: 12px; }
.support-captcha-refresh {
    border: 1px solid var(--border-color); background: var(--panel-bg); color: var(--text-secondary);
    cursor: pointer; font-size: 18px; line-height: 1; width: 36px; height: 36px;
    border-radius: 6px; flex: none;
}
.support-captcha-refresh:hover { background: var(--tool-hover); color: var(--text-primary); }
.support-captcha-input { letter-spacing: .18em; text-transform: uppercase; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.support-captcha-state { display: flex; align-items: center; gap: 8px; }
.support-captcha-dot {
    width: 9px; height: 9px; border-radius: 50%; background: #9ca3af; flex: none;
}
.support-captcha-dot.pending { background: #f59e0b; animation: support-pulse 1s ease-in-out infinite; }
.support-captcha-dot.ok { background: #16a34a; }
.support-captcha-dot.err { background: #dc2626; }
@keyframes support-pulse { 0%,100% { opacity: 1; } 50% { opacity: .35; } }

.support-status { font-size: 13px; min-height: 18px; }
.support-status.err { color: #dc2626; }
.support-status.warn { color: #b45309; }
.support-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 4px; }
.support-submit { background: var(--accent-color); color: #fff; border-color: var(--accent-color); }
.support-submit:hover { background: var(--accent-hover); }
.support-submit:disabled { opacity: .6; cursor: default; }

.support-success { text-align: center; padding: 8px 4px; }
.support-success-icon {
    width: 46px; height: 46px; border-radius: 50%; margin: 0 auto 10px;
    background: #dcfce7; color: #16a34a; font-size: 26px; line-height: 46px;
}
.support-success h3 { margin: 0 0 6px; }
.support-ref { color: var(--accent-color); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.support-save-warn {
    font-size: 13px; color: #92400e; background: #fef3c7;
    border: 1px solid #fcd34d; border-radius: 6px; padding: 9px 12px; margin: 12px 0 8px;
}
.support-linkrow { display: flex; gap: 8px; }
.support-linkrow .support-input { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; }

/* ---- Shape info slide-out: descriptions + comment threads ---- */
.shape-info-panel {
    position: fixed;
    top: 48px;
    right: 0;
    bottom: 0;
    width: 340px;
    background: var(--panel-bg);
    border-left: 1px solid var(--border-color);
    box-shadow: -4px 0 20px rgba(0,0,0,0.12);
    z-index: 350;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: translateX(100%);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}
.shape-info-panel.open { transform: translateX(0); }

.shape-info-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 12px 14px;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}
.shape-info-title { font-weight: 600; font-size: 14px; color: var(--text-color); }
.shape-info-close {
    border: none; background: transparent; cursor: pointer;
    font-size: 15px; line-height: 1; color: var(--text-color);
    padding: 4px 6px; border-radius: 6px;
}
.shape-info-close:hover { background: var(--tool-hover); }

.shape-info-body {
    flex: 1;
    overflow-y: auto;
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* Editor + composer shared bits */
.si-textarea {
    width: 100%;
    box-sizing: border-box;
    min-height: 96px;
    resize: vertical;
    font: inherit;
    font-size: 13px;
    padding: 8px 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-color);
    color: var(--text-color);
}
.si-hint { font-size: 11px; color: #6b7280; }
.si-preview-label { font-size: 11px; font-weight: 600; color: #6b7280; text-transform: uppercase; letter-spacing: 0.04em; }
.si-preview { background: var(--bg-color); border: 1px solid var(--border-color); border-radius: 8px; padding: 8px 10px; min-height: 24px; }
.si-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.si-actions .btn { flex: 1; }
.si-primary { background: var(--accent-color); color: #fff; border-color: var(--accent-color); }
.si-primary:hover { filter: brightness(1.05); }
.si-danger { color: #dc2626; }
.si-resolve { color: #047857; }
.si-empty { font-size: 13px; color: #6b7280; padding: 8px 0; }

/* Comment thread */
.si-thread { display: flex; flex-direction: column; gap: 10px; max-height: 55vh; overflow-y: auto; }
.si-msg { border: 1px solid var(--border-color); border-radius: 8px; padding: 8px 10px; background: var(--panel-bg); }
.si-msg-topic { border-left: 3px solid var(--accent-color); }
.si-msg-head { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; }
.si-msg-author { font-weight: 600; font-size: 12px; color: var(--text-color); }
.si-msg-time { font-size: 11px; color: #6b7280; }
.si-msg-del { margin-left: auto; border: none; background: transparent; cursor: pointer; color: #9ca3af; font-size: 12px; padding: 2px 4px; border-radius: 4px; }
.si-msg-del:hover { background: var(--tool-hover); color: #dc2626; }
.si-composer { display: flex; flex-direction: column; gap: 8px; border-top: 1px solid var(--border-color); padding-top: 10px; }

/* Sanitized markdown rendering */
.md-body { font-size: 13px; line-height: 1.5; color: var(--text-color); word-break: break-word; }
.md-body > *:first-child { margin-top: 0; }
.md-body > *:last-child { margin-bottom: 0; }
.md-body h1, .md-body h2, .md-body h3, .md-body h4, .md-body h5, .md-body h6 { margin: 10px 0 6px; line-height: 1.25; }
.md-body h1 { font-size: 18px; } .md-body h2 { font-size: 16px; } .md-body h3 { font-size: 14px; }
.md-body h4, .md-body h5, .md-body h6 { font-size: 13px; }
.md-body p { margin: 6px 0; }
.md-body ul, .md-body ol { margin: 6px 0; padding-left: 22px; }
.md-body li { margin: 2px 0; }
.md-body a { color: var(--accent-color); text-decoration: underline; }
.md-body code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; background: var(--bg-color); padding: 1px 4px; border-radius: 4px; }
.md-body pre { background: var(--bg-color); border: 1px solid var(--border-color); border-radius: 8px; padding: 8px 10px; overflow-x: auto; }
.md-body pre code { background: none; padding: 0; }
.md-body blockquote { margin: 6px 0; padding: 2px 12px; border-left: 3px solid var(--border-color); color: #6b7280; }
.md-body hr { border: none; border-top: 1px solid var(--border-color); margin: 10px 0; }

@media (max-width: 600px), (pointer: coarse) and (max-width: 1024px) {
    .shape-info-panel { top: 0; width: 100%; z-index: 600; border-left: none; }
    .si-thread { max-height: 48vh; }
}