/* ==========================================================================
   layout.css — app shell: WebGL stage, UI layer, header, brand, mode switcher
   ========================================================================== */

/* ---- WebGL stage ---- */

.scene {
    position: fixed;
    inset: 0;
    z-index: 1;
    pointer-events: none;
}

/* ---- UI layer (click-through; interactive children opt in) ---- */

.ui-layer {
    position: fixed;
    inset: 0;
    z-index: 10;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 100%;
    height: 100%;
    padding: var(--layout-pad);
    pointer-events: none;
    opacity: 0;
}

html.is-ready .ui-layer {
    opacity: 1;
    transition: opacity 0.7s var(--ease-out);
}

/* ---- Header ---- */

.app-header {
    z-index: 20;
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.brand__logo {
    height: 3rem;
    width: auto;
    color: #ffffff;
    opacity: 0.85;
    transition: opacity 300ms var(--ease-standard);
    filter: drop-shadow(0 4px 3px rgb(0 0 0 / 0.07)) drop-shadow(0 2px 2px rgb(0 0 0 / 0.06));
}

.brand__logo:hover { opacity: 1; }

@media (min-width: 768px) {
    .brand { gap: 1.25rem; }
    .brand__logo { height: 3.5rem; }
}

/* ---- Mode switcher (COIN / YES-NO) ---- */

.mode-nav {
    position: relative;
    display: flex;
    padding: 0.25rem;
    border: 1px solid rgb(255 255 255 / 0.1);
    border-radius: 9999px;
    background-color: rgb(255 255 255 / 0.05);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
}

.mode-nav__indicator {
    position: absolute;
    top: 0.25rem;
    bottom: 0.25rem;
    z-index: 0;
    width: calc(50% - 4px);
    border-radius: 9999px;
    background-color: #ffffff;
    transition: transform 300ms var(--ease-out);
}

.mode-nav[data-mode='yesno'] .mode-nav__indicator {
    transform: translateX(100%);
}

.mode-nav__tab {
    position: relative;
    z-index: 10;
    width: 5rem;
    padding: 0.5rem 0;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: rgb(255 255 255 / 0.5);
    transition: color 300ms var(--ease-standard);
}

.mode-nav__tab:not(.is-active):hover { color: #ffffff; }
.mode-nav__tab.is-active             { color: #000000; }

@media (min-width: 768px) {
    .mode-nav__tab {
        width: 7rem;
        font-size: 0.75rem;
        line-height: 1rem;
    }
}