#gameCanvas {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
    z-index: 1;
}

.ui {
    position: fixed;
    inset: 0;
    z-index: 2;
    pointer-events: none;
}

.hud {
    position: absolute;
    top: max(18px, env(safe-area-inset-top));
    left: 50%;
    transform: translateX(-50%);
    width: min(280px, calc(100% - 96px));
    text-align: center;
    opacity: 0;
    transition: opacity 0.2s var(--ease);
}

.hud.on {
    opacity: 1;
}

.icon-btn {
    position: absolute;
    top: max(16px, env(safe-area-inset-top));
    right: max(16px, env(safe-area-inset-right));
    width: 40px;
    height: 40px;
    display: grid;
    place-items: center;
    padding: 0;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(16, 17, 22, 0.72);
    pointer-events: auto;
}

.icon-btn[hidden] {
    display: none !important;
}

.icon-btn svg {
    width: 14px;
    height: 14px;
    fill: var(--text);
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.08);
}

.toast {
    position: absolute;
    top: max(128px, calc(env(safe-area-inset-top) + 112px));
    left: 50%;
    transform: translate(-50%, 6px);
    margin: 0;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--line);
    color: var(--text);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: -0.01em;
    opacity: 0;
    transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
}

.toast.on {
    opacity: 1;
    transform: translate(-50%, 0);
}

.panel {
    position: absolute;
    left: 50%;
    top: 50%;
    width: min(380px, calc(100% - 32px));
    max-height: calc(100% - 24px);
    overflow: auto;
    padding: 26px 22px 16px;
    border-radius: 28px;
    background: rgba(12, 13, 18, 0.94);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.38);
    backdrop-filter: blur(22px);
    opacity: 0;
    transform: translate(-50%, -46%);
    pointer-events: none;
    visibility: hidden;
    transition: opacity 0.28s var(--ease), transform 0.28s var(--ease), visibility 0s linear 0.28s;
}

.panel.on {
    opacity: 1;
    transform: translate(-50%, -50%);
    pointer-events: auto;
    visibility: visible;
    transition: opacity 0.28s var(--ease), transform 0.28s var(--ease), visibility 0s;
}

.pad {
    position: absolute;
    right: max(16px, env(safe-area-inset-right));
    bottom: max(16px, env(safe-area-inset-bottom));
    width: 148px;
    height: 148px;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: 1fr 1fr 1fr;
    pointer-events: auto;
}

.pad[hidden] {
    display: none !important;
}

.pad button[data-dir="up"] { grid-area: 1 / 2; }
.pad button[data-dir="left"] { grid-area: 2 / 1; }
.pad button[data-dir="down"] { grid-area: 3 / 2; }
.pad button[data-dir="right"] { grid-area: 2 / 3; }