.ktbm-persistent-ui {
    position: fixed;
    inset: 0;
    z-index: 11000;
    pointer-events: none;
    font-family: var(--ktbm-font-primary, "Nunito", Arial, sans-serif);
    user-select: none;
    -webkit-user-select: none;
}

.ktbm-persistent-ui * {
    user-select: none;
    -webkit-user-select: none;
}

.ktbm-persistent-button {
    pointer-events: auto;
    position: fixed;
    z-index: 1;
    width: clamp(34px, 3.5vw, 48px);
    height: clamp(34px, 3.5vw, 48px);
    border: 0;
    padding: 0;
    background: transparent;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    filter: drop-shadow(0 5px 12px rgba(0, 0, 0, 0.18));
    transition: transform 0.16s ease, filter 0.16s ease;
}

.ktbm-persistent-button:hover {
    transform: translateY(-2px) scale(1.03);
    filter: drop-shadow(0 8px 16px rgba(0, 0, 0, 0.24));
}

.ktbm-persistent-button:active {
    transform: translateY(0) scale(0.97);
}

.ktbm-persistent-button img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    user-select: none;
    -webkit-user-drag: none;
}

.ktbm-persistent-home {
    top: 1.4%;
    left: 1.4%;
}

.ktbm-persistent-settings {
    top: 1.4%;
    right: 1.4%;
}

.ktbm-persistent-fullscreen {
    top: 1.4%;
    right: calc(1.4% + clamp(34px, 3.5vw, 48px) + clamp(4px, 0.55vw, 8px));
}

.ktbm-persistent-sound {
    top: 1.4%;
    right: calc(1.4% + (clamp(34px, 3.5vw, 48px) + clamp(4px, 0.55vw, 8px)) * 2);
}

.ktbm-persistent-character-focus {
    top: 1.4%;
    right: calc(1.4% + (clamp(34px, 3.5vw, 48px) + clamp(4px, 0.55vw, 8px)) * 3);
    display: none;
}

.ktbm-persistent-character-focus.is-visible {
    display: inline-flex;
}

.ktbm-settings-backdrop {
    pointer-events: auto;
    position: fixed;
    inset: 0;
    z-index: 2;
    display: none;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.42);
    backdrop-filter: blur(2px);
}

.ktbm-settings-backdrop.is-visible {
    display: flex;
}

.ktbm-settings-panel {
    position: relative;
    width: min(58vw, 600px);
    min-width: min(88vw, 360px);
    min-height: 338px;
    padding: 96px 54px 58px;
    border-radius: 10px;
    background: rgba(221, 221, 221, 0.94);
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.24);
}

.ktbm-settings-title {
    position: absolute;
    top: -30px;
    left: 50%;
    transform: translateX(-50%);
    min-width: 300px;
    padding: 14px 42px;
    border: 1px solid rgba(120, 120, 120, 0.45);
    border-radius: 4px;
    background: rgba(248, 248, 248, 0.98);
    color: #050505;
    font-family: var(--ktbm-font-primary, "Nunito", Arial, sans-serif);
    font-size: clamp(1.35rem, 2.2vw, 1.85rem);
    font-weight: 900;
    text-align: center;
    letter-spacing: 0;
}

.ktbm-settings-close {
    position: absolute;
    top: -20px;
    right: -22px;
    width: 44px;
    height: 44px;
    border: 3px solid #ffffff;
    border-radius: 50%;
    background: #8c8c8c;
    color: #ffffff;
    font-size: 2rem;
    line-height: 1;
    font-weight: 800;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.18);
}

.ktbm-settings-group + .ktbm-settings-group {
    margin-top: 28px;
}

.ktbm-settings-label {
    display: block;
    margin-bottom: 22px;
    color: #050505;
    font-size: 0.86rem;
    font-weight: 900;
}

.ktbm-settings-slider {
    width: 100%;
    height: 12px;
    appearance: none;
    -webkit-appearance: none;
    border-radius: 999px;
    background: linear-gradient(90deg, #646464 0%, #646464 var(--ktbm-slider-percent, 50%), #9e9999 var(--ktbm-slider-percent, 50%), #9e9999 100%);
    outline: none;
}

.ktbm-settings-slider::-webkit-slider-thumb {
    width: 38px;
    height: 38px;
    appearance: none;
    -webkit-appearance: none;
    border: 0;
    border-radius: 50%;
    background: #5c5c5c;
    cursor: pointer;
}

.ktbm-settings-slider::-moz-range-thumb {
    width: 38px;
    height: 38px;
    border: 0;
    border-radius: 50%;
    background: #5c5c5c;
    cursor: pointer;
}

body.ktbm-persistent-ui-active .btn-back,
body.ktbm-persistent-ui-active .top-right,
body.ktbm-persistent-ui-active #btn-download,
body.ktbm-persistent-ui-active #btn-cam,
body.ktbm-persistent-ui-active #open-settings-btn,
body.ktbm-persistent-ui-active #toggle-focus-btn,
body.ktbm-persistent-ui-active #hud-volume {
    display: none !important;
}

@media (max-width: 640px) {
    .ktbm-settings-panel {
        width: 86vw;
        min-width: 0;
        padding: 82px 28px 42px;
    }

    .ktbm-settings-title {
        min-width: min(68vw, 260px);
    }
}