/**
 * Game Menu Layout — Layered SVG Architecture
 *
 * Two phases: auth (background + fog + constellation) → menu (frame + buttons).
 * All SVG layers share dynamically computed viewBox for cover-mode mapping.
 *
 * .mm-viewport    — fullscreen wrapper
 * .mm-layer       — shared style for all SVG layers
 * .mm-bg-select   — fullscreen background carousel (pre-auth)
 * .mm-layer-frame — frame image layer (post-auth)
 * .mm-layer-menu  — sprite/ring layers (post-auth)
 */

/* --- Viewport --- */

.mm-viewport {
    position: fixed;
    inset: 0;
    overflow: hidden;
    background: #000;
    opacity: 0;
    transition: opacity 0.8s ease-in;
    isolation: isolate;
}

.mm-viewport.mm-visible {
    opacity: 0.999;
}

/* --- SVG layers: stacked, same size, same coordinate mapping --- */

.mm-layer {
    position: absolute;
    left: 0;
    top: 0;
    display: block;
    pointer-events: none;
}

.mm-layer-hitbox {
    pointer-events: auto;
    z-index: 20;
}

/* --- Background carousel (fullscreen, pre-auth) --- */

.mm-bg-select {
    position: fixed;
    inset: 0;
    z-index: 100;
    transition: opacity 0.6s ease;
}

.mm-bg-select-hidden {
    opacity: 0;
    pointer-events: none;
}

/* Fullscreen background image */
.mm-bg-preview {
    position: absolute;
    inset: 0;
    object-fit: cover;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.mm-bg-preview-active {
    opacity: 1;
}

/* Arrow buttons (left/right navigation) */
.mm-bg-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    padding: 8px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.4);
    cursor: pointer;
    transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mm-bg-arrow:hover {
    background: rgba(0, 0, 0, 0.6);
    border-color: rgba(237, 28, 36, 0.5);
    transform: translateY(-50%) scale(1.1);
}

.mm-bg-arrow img {
    width: 24px;
    height: 24px;
    filter: brightness(0.8);
    pointer-events: none;
}

.mm-bg-arrow-left {
    left: 24px;
}

.mm-bg-arrow-left img {
    transform: scaleX(-1);
}

.mm-bg-arrow-right {
    right: 24px;
}

/* Dot indicators */
.mm-bg-dots {
    position: absolute;
    bottom: 48px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
    z-index: 10;
}

.mm-bg-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.25);
    border: 1px solid rgba(255, 255, 255, 0.15);
    transition: background 0.3s ease, transform 0.3s ease;
    cursor: pointer;
}

.mm-bg-dot:hover {
    background: rgba(255, 255, 255, 0.45);
}

.mm-bg-dot-active {
    background: rgba(237, 28, 36, 0.7);
    border-color: rgba(237, 28, 36, 0.5);
    transform: scale(1.3);
}

/* World label */
.mm-bg-label {
    position: absolute;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.5);
    font-family: var(--ase-font-mono, monospace);
    font-size: 13px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    z-index: 10;
    transition: opacity 0.3s ease;
}

/* Confirm hint */
.mm-bg-confirm {
    position: absolute;
    bottom: 120px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.3);
    font-family: var(--ase-font-mono, monospace);
    font-size: 11px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    z-index: 10;
}

/* Loading spinner for lazy-loaded backgrounds */
.mm-bg-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 32px;
    height: 32px;
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-top-color: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    animation: mm-spin 0.8s linear infinite;
    z-index: 5;
    transition: opacity 0.3s ease;
}

@keyframes mm-spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* --- Menu layers: hidden until auth completes --- */

.mm-layer-frame {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.6s ease;
    /* Shadow handled by SVG filter (url(#frame-shadow)) in renderer.js */
}

.mm-layer-menu {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.6s ease;
}

.mm-phase-menu .mm-layer-frame {
    opacity: 1;
}

.mm-phase-menu .mm-layer-menu {
    opacity: 1;
    pointer-events: auto;
}

/* --- Info button (bottom-left, CSS-fixed with gauge ring) --- */

/* Sphere buttons use inline styles from buildSphereButton() factory */

/* --- Config panel (centered modal) --- */

.mm-config-panel {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.95);
    width: max(50vw, 360px);
    height: max(50vh, 300px);
    background: var(--ase-surface-1, rgba(10, 10, 14, 0.95));
    border: 1px solid var(--ase-border-alpha-25, rgba(255, 255, 255, 0.1));
    border-radius: 6px;
    font-family: var(--ase-font-mono, monospace);
    color: var(--ase-text-light, #e0e0e0);
    z-index: 200;
    display: none;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
    flex-direction: column;
}

.mm-config-panel.mm-config-open {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, -50%) scale(1);
}

@media (max-width: 767px) {
    .mm-config-panel {
        width: 90vw;
        height: 70vh;
    }
}

@media (max-width: 639px) {
    .mm-config-panel {
        width: 95vw;
        height: 80vh;
        border-radius: 4px;
    }
}

.mm-config-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 12px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.5);
}

.mm-config-close {
    cursor: pointer;
    font-size: 20px;
    line-height: 1;
    color: rgba(255, 255, 255, 0.3);
    transition: color 0.15s ease;
}

.mm-config-close:hover {
    color: rgba(237, 28, 36, 0.8);
}

.mm-config-body {
    padding: 16px 20px 20px;
    flex: 1;
    overflow-y: auto;
}

/* --- Locked menu (dimmed before auth, cleared after) --- */

.mm-locked {
    filter: brightness(0.3);
    pointer-events: none;
    transition: filter 0.6s ease;
}

.mm-locked-off {
    filter: brightness(1);
    pointer-events: auto;
}