/* --- Window Modals --- */

.os-window {
    position: absolute;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    
    /* Hardware-accelerated entry animation state */
    opacity: 0;
    transform: scale(0.98);
    transition: opacity var(--transition-fast), transform var(--transition-fast);
    
    /* Will-change hints the browser to optimize these properties */
    will-change: transform, opacity, left, top;
}

.os-window.is-open {
    opacity: 1;
    transform: scale(1);
}

.os-window.is-minimized {
    display: none;
}

.os-window.is-maximized {
    border-radius: 0;
    transition: opacity var(--transition-fast), left 150ms ease, top 150ms ease, width 150ms ease, height 150ms ease;
}

/* --- Resize Handles --- Thin invisible hit-zones on every edg */

.resize-handle {
    position: absolute;
    z-index: 5;
}

.resize-n, .resize-s {
    left: 6px;
    right: 6px;
    height: 6px;
    cursor: ns-resize;
}
.resize-n { top: -3px; }
.resize-s { bottom: -3px; }

.resize-e, .resize-w {
    top: 6px;
    bottom: 6px;
    width: 6px;
    cursor: ew-resize;
}
.resize-e { right: -3px; }
.resize-w { left: -3px; }

.resize-ne, .resize-nw, .resize-se, .resize-sw {
    width: 14px;
    height: 14px;
}
.resize-ne { top: -3px; right: -3px; cursor: nesw-resize; }
.resize-nw { top: -3px; left: -3px; cursor: nwse-resize; }
.resize-se { bottom: -3px; right: -3px; cursor: nwse-resize; }
.resize-sw { bottom: -3px; left: -3px; cursor: nesw-resize; }

.os-window.is-maximized .resize-handle {
    display: none;
}

.window-header {
    height: 36px;
    background-color: var(--bg-void);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 12px;
    cursor: grab;
    user-select: none;
}

.window-header:active {
    cursor: grabbing;
}

.window-title {
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    text-transform: uppercase;
}

.window-controls {
    display: flex;
    gap: 8px;
}

.win-btn {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 1px solid var(--border-subtle);
    background: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.win-btn svg {
    width: 8px;
    height: 8px;
    stroke: var(--text-muted);
    opacity: 0; /* Hide icons until hover for clean aesthetic */
    transition: opacity var(--transition-fast);
}

.window-controls:hover .win-btn svg {
    opacity: 1;
}

.win-btn.close:hover {
    border-color: var(--status-error);
    background-color: rgba(217, 72, 72, 0.1);
}
.win-btn.close:hover svg { stroke: var(--status-error); }

.win-btn.minimize:hover {
    border-color: var(--text-primary);
}
.win-btn.minimize:hover svg { stroke: var(--text-primary); }

.win-btn.maximize:hover {
    border-color: var(--accent-blue);
}
.win-btn.maximize:hover svg { stroke: var(--accent-blue); }

.window-content {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
    position: relative;
    /* Placeholder for content until we build apps */
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 12px;
}