/* ========================================
   Whiteboard Section - Full Width
======================================== */
.whiteboard-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    background: var(--bg-base);
    position: relative;
}

/* ========================================
   Toolbar - Floating Bar
======================================== */
.wb-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-2) var(--space-4);
    min-height: 52px;
    background: var(--bg-base);
    border-bottom: 1px solid var(--border-subtle, rgba(128,128,128,0.1));
    flex-shrink: 0;
    gap: var(--space-2);
    overflow-x: auto;
}

.wb-toolbar-left,
.wb-toolbar-center,
.wb-toolbar-right {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-shrink: 0;
}

.wb-toolbar-center {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.wb-toolbar-group {
    display: flex;
    align-items: center;
    gap: 2px;
    background: var(--bg-secondary, rgba(128,128,128,0.06));
    border-radius: var(--radius-md);
    padding: 2px;
}

.wb-toolbar-divider {
    width: 1px;
    height: 24px;
    background: var(--border-subtle, rgba(128,128,128,0.12));
    margin: 0 var(--space-1);
    flex-shrink: 0;
}

/* Tool Buttons */
.wb-tool-btn {
    width: 34px;
    height: 34px;
    border-radius: var(--radius-md);
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.wb-tool-btn svg {
    width: 18px;
    height: 18px;
    stroke-width: 1.5;
}

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

.wb-tool-btn.active {
    background: var(--accent-subtle);
    color: var(--accent);
}

/* Color Selector */
.wb-colors {
    display: flex;
    align-items: center;
    gap: 4px;
}

.wb-color-btn {
    width: 20px;
    height: 20px;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
    flex-shrink: 0;
    border: 2px solid transparent;
}

.wb-color-btn:hover {
    transform: scale(1.2);
}

.wb-color-btn.active {
    transform: scale(1.15);
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-subtle);
}

/* Size Selector */
.wb-sizes {
    display: flex;
    align-items: center;
    gap: 2px;
}

.wb-size-btn {
    width: 30px;
    height: 30px;
    border-radius: var(--radius-md);
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
    flex-shrink: 0;
}

.wb-size-btn:hover {
    background: var(--bg-hover);
}

.wb-size-btn.active {
    background: var(--accent-subtle);
}

.wb-size-dot {
    background: var(--text-tertiary);
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
}

.wb-size-btn.active .wb-size-dot {
    background: var(--accent);
}

/* Secondary Button */
.wb-secondary-btn {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    background: transparent;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-tertiary);
    transition: var(--transition-fast);
    flex-shrink: 0;
}

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

.wb-secondary-btn.destructive:hover {
    background: var(--destructive-subtle);
    color: var(--destructive);
}

.wb-secondary-btn svg {
    width: 16px;
    height: 16px;
}

/* ========================================
   Canvas Container
======================================== */
.wb-canvas-container {
    flex: 1;
    background: #ffffff;
    overflow: hidden;
    position: relative;
}

#whiteboard {
    width: 100%;
    height: 100%;
    cursor: crosshair;
    display: block;
}

/* ========================================
   Bottom Bar
======================================== */
.wb-bottom-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-2) var(--space-4);
    height: 52px;
    background: var(--bg-base);
    border-top: 1px solid var(--border-subtle, rgba(128,128,128,0.1));
    flex-shrink: 0;
}

.wb-bottom-left,
.wb-bottom-right {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.wb-zoom-control {
    display: flex;
    align-items: center;
    gap: 2px;
    background: var(--bg-secondary, rgba(128,128,128,0.06));
    border-radius: var(--radius-md);
    padding: 2px;
}

.wb-zoom-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    min-width: 42px;
    text-align: center;
    cursor: pointer;
    padding: 4px 6px;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
    user-select: none;
}

.wb-zoom-label:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.wb-zoom-btn {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--text-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

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

.wb-zoom-btn svg {
    width: 16px;
    height: 16px;
}

/* Primary CTA */
.wb-primary-btn {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-5);
    border-radius: var(--radius-full);
    background: var(--accent);
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-text);
    transition: var(--transition-fast);
}

.wb-primary-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.wb-primary-btn svg {
    width: 18px;
    height: 18px;
}

/* Ghost Button */
.wb-ghost-btn {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    background: transparent;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

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

.wb-ghost-btn.destructive:hover {
    background: var(--destructive-subtle);
    color: var(--destructive);
}

.wb-ghost-btn svg {
    width: 16px;
    height: 16px;
}

/* ========================================
   Responsive: collapse toolbar on small screens
======================================== */
@media (max-width: 768px) {
    .wb-toolbar {
        padding: var(--space-2);
        gap: var(--space-1);
    }
    .wb-toolbar-divider {
        margin: 0;
    }
    .wb-colors {
        gap: 3px;
    }
    .wb-color-btn {
        width: 24px;
        height: 24px;
    }
    .wb-tool-btn {
        width: 36px;
        height: 36px;
    }
    .wb-tool-btn svg {
        width: 18px;
        height: 18px;
    }
    .wb-secondary-btn span {
        display: none;
    }
    .wb-secondary-btn {
        min-width: 36px;
        min-height: 36px;
        justify-content: center;
    }
    .wb-zoom-btn {
        width: 36px;
        height: 36px;
    }
    .wb-bottom-bar {
        padding: var(--space-2) var(--space-3);
    }
}