/* ===================================================================
   ADG 3D Engine — Toolbar
   Apple-style vertical tool strip with squircle buttons
   =================================================================== */

/* ── Toolbar Container ── */
.app-toolbar {
    width: var(--toolbar-width, 52px);
    flex-shrink: 0;
    background: var(--glass-bg-thick);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-right: 1px solid var(--separator-light);
    padding: 12px 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    z-index: var(--z-toolbar);
    height: 100%;
    transition: all var(--duration-normal) var(--ease-spring);
}

/* ── Calibration Mode (Floating) ── */
.app-layout.mode-calibration .app-toolbar {
    height: auto;
    width: auto;
    border: var(--glass-border);
    border-radius: var(--radius-lg);
    flex-direction: row;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur-heavy);
    box-shadow: var(--glass-shadow);
}

/* Drag Handle */
.drag-handle {
    cursor: grab;
    color: var(--text-quaternary);
    padding: 5px;
    font-size: 14px;
    user-select: none;
    display: none;
}

.app-layout.mode-calibration .drag-handle {
    display: block;
}

.app-layout.mode-calibration .drag-handle:active {
    cursor: grabbing;
}

/* ── Tool Groups ── */
.tool-group {
    display: flex;
    flex-direction: column;
    gap: 2px;
    width: 100%;
    align-items: center;
    padding: 4px 0;
    position: relative;
}

/* Separator between groups */
.tool-group+.tool-group::before {
    content: '';
    position: absolute;
    top: 0;
    left: 12px;
    right: 12px;
    height: 1px;
    background: var(--separator-light);
}

.tool-group:last-child {
    border-bottom: none;
}

.app-layout.mode-calibration .tool-group {
    flex-direction: row;
    padding: 0;
    width: auto;
}

.app-layout.mode-calibration .tool-group+.tool-group::before {
    display: none;
}

/* ── Tool Button (Squircle) ── */
.tool-btn {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: all var(--duration-fast) var(--ease-default);
    position: relative;
}

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

/* Active Tool */
.tool-btn.active {
    color: var(--accent);
    background: var(--accent-dim);
}

/* Active indicator bar */
.tool-btn.active::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 16px;
    background: var(--accent);
    border-radius: 2px 0 0 2px;
}

.app-layout.mode-calibration .tool-btn.active::after {
    display: none;
}

/* ── Spacer ── */
.spacer {
    flex: 1;
}

/* ── Tool Icon ── */
.tool-btn .icon {
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ── Tool Settings HUD (Right Sidebar) ── */
.tool-settings-hud {
    position: relative;
    width: 100%;
    background: rgba(0, 0, 0, 0.25);
    border-bottom: 1px solid var(--separator-light);
    padding: 16px;
    color: var(--text-primary);
    z-index: 2000;
    user-select: none;
    animation: hudSlideIn var(--duration-enter) var(--ease-spring);
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
}

@keyframes hudSlideIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hud-header {
    font: var(--text-overline);
    color: var(--text-tertiary);
    margin-bottom: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hud-item {
    margin-bottom: 16px;
}

.hud-item:last-child {
    margin-bottom: 0;
}

.hud-item label {
    display: block;
    font: var(--text-caption);
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.hud-item input[type="number"] {
    width: 100%;
    background: var(--fill-quaternary);
    border: 1px solid var(--separator-light);
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    color: var(--text-primary);
    font: 400 13px/1 var(--font-sans);
    outline: none;
    transition: all var(--duration-fast) var(--ease-default);
    box-sizing: border-box;
}

.hud-item input[type="number"]:focus {
    border-color: var(--accent);
    background: rgba(10, 132, 255, 0.06);
    box-shadow: var(--accent-glow);
}

/* Toggle Group */
.hud-toggle-group {
    display: flex;
    gap: 2px;
    background: var(--fill-quaternary);
    padding: 2px;
    border-radius: var(--radius-sm);
}

.hud-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 7px 4px;
    font: 500 12px/1 var(--font-sans);
    cursor: pointer;
    border-radius: calc(var(--radius-sm) - 2px);
    transition: all var(--duration-fast) var(--ease-default);
}

.hud-btn.active {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.hud-btn:hover:not(.active) {
    color: var(--text-primary);
}

/* Constrain all HUD inputs */
.hud-item input,
.hud-item select {
    box-sizing: border-box !important;
    max-width: 100%;
}

.tool-settings-hud * {
    box-sizing: border-box;
}

/* HUD Row Layout */
.hud-row {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.hud-item-half {
    flex: 1;
    min-width: 0;
}

.hud-item-half label {
    display: block;
    font: var(--text-caption);
    color: var(--text-secondary);
    margin-bottom: 6px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.hud-item-half input {
    width: 100%;
    background: var(--fill-quaternary);
    border: 1px solid var(--separator-light);
    border-radius: var(--radius-sm);
    padding: 7px 10px;
    color: var(--text-primary);
    font: 400 13px/1 var(--font-sans);
    outline: none;
    transition: all var(--duration-fast) var(--ease-default);
}

.hud-item-half input:focus {
    border-color: var(--accent);
    background: rgba(10, 132, 255, 0.06);
}