/* ==========================================================================
   Nova OS Window System
   ========================================================================== */

.window-layer {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    pointer-events: none;
    z-index: 100;
}

.nova-window {
    position: absolute;
    pointer-events: auto;
    display: flex;
    flex-direction: column;
    background: var(--surface-glass);
    backdrop-filter: blur(40px) saturate(180%);
    -webkit-backdrop-filter: blur(40px) saturate(180%);
    border: 1px outset rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    box-shadow: var(--shadow-ambient), var(--shadow-inset);
    overflow: hidden;
    will-change: transform, width, height, top, left;
    transition: box-shadow 0.3s ease, border-color 0.3s ease;
    opacity: 0;
    transform: scale(0.95);
    animation: windowOpen 0.4s var(--curve-spring) forwards;
}

@keyframes windowOpen {
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.nova-window.is-closing {
    animation: windowClose 0.2s ease-in forwards;
}

@keyframes windowClose {
    to {
        opacity: 0;
        transform: scale(0.95);
    }
}

.nova-window.is-active {
    box-shadow: var(--shadow-elevated), var(--shadow-inset);
    border-color: var(--border-glass-strong);
    z-index: 150 !important;
}

/* ==========================================================================
   Window Titlebar
   ========================================================================== */
.window-titlebar {
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    user-select: none;
    border-bottom: 1px solid var(--border-glass);
    cursor: grab;
    flex-shrink: 0;
}

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

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

.window-btn {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.15);
    transition: background 0.2s ease, transform 0.2s var(--curve-spring);
    color: transparent;
}

.window-btn svg {
    width: 8px;
    height: 8px;
    stroke-width: 3;
}

.window-layer:hover .window-btn {
    color: rgba(255, 255, 255, 0.6);
}

.window-btn:hover {
    transform: scale(1.1);
    color: #fff;
}

.window-btn.close:hover { background: #EF4444; }
.window-btn.minimize:hover { background: #F59E0B; }
.window-btn.maximize:hover { background: #10B981; }

.window-title {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
    flex-grow: 1;
    text-align: center;
    pointer-events: none;
}

.window-placeholder {
    width: 60px; /* Balance for controls */
}

/* ==========================================================================
   Window Content Area
   ========================================================================== */
.window-content {
    flex-grow: 1;
    position: relative;
    overflow: hidden;
    background: rgba(0, 0, 0, 0.2); /* Slightly darker inner area */
    border-bottom-left-radius: 16px;
    border-bottom-right-radius: 16px;
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
}

/* Resize Handles */
.resize-handle {
    position: absolute;
    z-index: 10;
}
.resize-e { right: 0; top: 0; bottom: 0; width: 6px; cursor: e-resize; }
.resize-s { bottom: 0; left: 0; right: 0; height: 6px; cursor: s-resize; }
.resize-se { bottom: 0; right: 0; width: 10px; height: 10px; cursor: se-resize; }