/* =========================================================
   RETROBASS R-26
   Phase 6: Power-Zustand und Bootsequenz
   ========================================================= */

/* ---------------------------------------------------------
   ausgeschalteter Zustand
   --------------------------------------------------------- */

.receiver:not(.is-powered) .display-screen {
    color: transparent;
}

.receiver:not(.is-powered) .boot-screen {
    opacity: 0;
}

.receiver:not(.is-powered) .display-equalizer span {
    height: 3px;
    opacity: 0.08;
    box-shadow: none;
}

/* ---------------------------------------------------------
   Power-Taste
   --------------------------------------------------------- */

.control-button--power .control-button__knob::after {
    content: "";

    position: absolute;
    z-index: 3;

    top: 50%;
    left: 50%;

    width: 6px;
    aspect-ratio: 1;

    border-radius: 50%;

    background: rgba(75, 42, 16, 0.48);

    box-shadow:
        inset 0 1px 1px rgba(255, 255, 255, 0.14);

    transform: translate(-50%, -50%);
}

.receiver.is-powered
.control-button--power
.control-button__knob::after {
    background: #e29a38;

    box-shadow:
        0 0 5px rgba(226, 154, 56, 0.90),
        0 0 12px rgba(226, 154, 56, 0.42);
}

/* ---------------------------------------------------------
   Display erwacht
   --------------------------------------------------------- */

.receiver.is-booting .display-glass {
    animation:
        display-glass-wake 1250ms ease forwards;
}

.receiver.is-powered .display-screen {
    box-shadow:
        inset 0 0 18px rgba(0, 0, 0, 0.90),
        inset 0 0 34px rgba(171, 79, 11, 0.045);
}


/* ---------------------------------------------------------
   Bootscreen
   --------------------------------------------------------- */

.boot-screen {
    position: relative;
    z-index: 2;

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;

    width: 100%;
    height: 100%;

    color: #d97b1b;

    text-align: center;

    opacity: 0;
}

.receiver.is-booting .boot-screen {
    animation: boot-screen-on 500ms ease 520ms forwards;
}

.boot-screen__logo {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.boot-screen__logo span {
    font-size: clamp(0.78rem, 1.7vw, 1.22rem);
    font-weight: 500;
    letter-spacing: 0.20em;

    text-shadow:
        0 0 7px rgba(221, 118, 19, 0.30);
}

.boot-screen__logo strong {
    margin-top: 5px;

    font-size: clamp(0.60rem, 1.18vw, 0.86rem);
    font-weight: 400;
    letter-spacing: 0.24em;
}

.boot-screen__status {
    display: flex;
    flex-direction: column;
    align-items: center;

    margin-top: clamp(13px, 2vw, 22px);
}

.boot-screen__line {
    display: block;

    color: rgba(224, 126, 24, 0.72);

    font-size: clamp(0.34rem, 0.68vw, 0.52rem);
    letter-spacing: 0.13em;

    opacity: 0;
}

.boot-screen__line--two {
    margin-top: 7px;
}

.boot-screen__line--three {
    margin-top: 9px;
}

/* ---------------------------------------------------------
   Bootzustände aus boot-sequence.js
   --------------------------------------------------------- */

.boot-screen__line[data-boot-state="waiting"] {
    opacity: 0.20;
    filter: blur(0.4px);
}

.boot-screen__line[data-boot-state="active"] {
    opacity: 1;

    color:
        rgba(
            224,
            126,
            24,
            0.88
        );

    animation:
        boot-line-state-in
        260ms
        ease
        both;
}

.boot-screen__line[data-boot-state="complete"] {
    opacity: 0.72;

    color:
        rgba(
            224,
            126,
            24,
            0.66
        );
}

.boot-screen__line[data-boot-state="ready"] {
    opacity: 1;

    color:
        #f0a342;

    animation:
        boot-line-state-in
        260ms
        ease
        both,

        ready-glow
        1800ms
        ease-in-out
        infinite;
}

@keyframes boot-line-state-in {
    from {
        opacity: 0;
        filter: blur(1.5px);
        transform: translateY(3px);
    }

    to {
        opacity: 1;
        filter: blur(0);
        transform: translateY(0);
    }
}

/* ---------------------------------------------------------
   Equalizer nach dem Boot
   --------------------------------------------------------- */

.receiver.is-ready .display-equalizer span {
    opacity: 0.82;

    transition:
        height 550ms ease,
        opacity 500ms ease,
        box-shadow 500ms ease;

    box-shadow:
        0 0 4px rgba(230, 131, 27, 0.38),
        0 0 9px rgba(211, 105, 14, 0.14);
}

/*
   Noch keine echte Audioanalyse.
   Nur ein sehr ruhiger Bereitschaftszustand.
*/

.receiver.is-ready .display-equalizer span:nth-child(1) {
    height: 18%;
}

.receiver.is-ready .display-equalizer span:nth-child(2) {
    height: 27%;
}

.receiver.is-ready .display-equalizer span:nth-child(3) {
    height: 36%;
}

.receiver.is-ready .display-equalizer span:nth-child(4) {
    height: 22%;
}

.receiver.is-ready .display-equalizer span:nth-child(5) {
    height: 42%;
}

.receiver.is-ready .display-equalizer span:nth-child(6) {
    height: 31%;
}

.receiver.is-ready .display-equalizer span:nth-child(7) {
    height: 19%;
}

.receiver.is-ready .display-equalizer span:nth-child(8) {
    height: 34%;
}

.receiver.is-ready .display-equalizer span:nth-child(9) {
    height: 39%;
}

.receiver.is-ready .display-equalizer span:nth-child(10) {
    height: 25%;
}

.receiver.is-ready .display-equalizer span:nth-child(11) {
    height: 16%;
}

/* ---------------------------------------------------------
   Ausschalten
   --------------------------------------------------------- */

.receiver.is-powering-off .boot-screen {
    animation: boot-screen-off 420ms ease forwards;
}

.receiver.is-powering-off .display-glass {
    animation: display-glass-off 650ms ease forwards;
}

/* ---------------------------------------------------------
   Animationen
   --------------------------------------------------------- */

@keyframes display-glass-wake {
    0% {
        filter: brightness(0.50);
    }

    18% {
        filter: brightness(0.74);
    }

    24% {
        filter: brightness(0.58);
    }

    100% {
        filter: brightness(1);
    }
}

@keyframes boot-screen-on {
    from {
        opacity: 0;
        filter: blur(3px);
        transform: scale(0.985);
    }

    to {
        opacity: 1;
        filter: blur(0);
        transform: scale(1);
    }
}

@keyframes boot-line-in {
    from {
        opacity: 0;
        transform: translateY(3px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes ready-glow {
    0%,
    100% {
        text-shadow:
            0 0 4px rgba(226, 135, 39, 0.25);
    }

    50% {
        text-shadow:
            0 0 8px rgba(240, 163, 66, 0.66),
            0 0 15px rgba(213, 107, 17, 0.22);
    }
}

@keyframes boot-screen-off {
    from {
        opacity: 1;
    }

    to {
        opacity: 0;
        filter: blur(2px);
    }
}

@keyframes display-glass-off {
    from {
        filter: brightness(1);
    }

    to {
        filter: brightness(0.46);
    }
}

/* ---------------------------------------------------------
   Reduzierte Bewegung
   --------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
    .receiver.is-booting .display-glass,
    .receiver.is-booting .boot-screen,
    .receiver.is-booting .boot-screen__line,
    .receiver.is-powering-off .boot-screen,
    .receiver.is-powering-off .display-glass {
        animation-duration: 1ms;
        animation-delay: 0ms;
    }

    .receiver.is-powered .boot-screen,
    .receiver.is-powered .boot-screen__line {
        opacity: 1;
    }
}

/* =========================================================
   RETROBASS R-26
   Phase 4.1c
   Übergabe vom Bootsystem an den Radiobetrieb
   ========================================================= */

/* ---------------------------------------------------------
   Bootscreen bleibt während des gesamten Starts sichtbar
   --------------------------------------------------------- */

.receiver.is-powered:not(.is-ready)
.boot-screen {
    visibility: visible;
    pointer-events: none;
}

/* ---------------------------------------------------------
   Boot abgeschlossen:
   Anzeige verliert kontrolliert ihre Spannung
   --------------------------------------------------------- */

.receiver[data-boot-stage="boot-complete"]
.boot-screen {
    animation:
        boot-screen-handoff
        420ms
        cubic-bezier(
            0.22,
            0.61,
            0.36,
            1
        )
        forwards;
}

/* ---------------------------------------------------------
   Nach READY liegt der Bootscreen unsichtbar unter dem
   Radiointerface, bleibt aber für den nächsten Start erhalten
   --------------------------------------------------------- */

.receiver.is-ready
.boot-screen {
    opacity: 0;
    visibility: hidden;

    filter:
        blur(1.5px)
        brightness(0.56);

    transform:
        scale(0.994);

    pointer-events: none;

    transition:
        opacity 240ms ease,
        visibility 0ms linear 240ms;
}

/* ---------------------------------------------------------
   Kurzer dunkler Übergabemoment im Display
   --------------------------------------------------------- */

.receiver[data-boot-stage="boot-complete"]
.display-screen {
    animation:
        display-signal-handoff
        420ms
        ease
        forwards;
}

/* ---------------------------------------------------------
   Radiointerface erhält erst nach der Übergabe volle Spannung
   --------------------------------------------------------- */

.receiver.is-ready
.radio-interface {
    animation:
        radio-interface-device-ready
        680ms
        cubic-bezier(
            0.22,
            0.61,
            0.36,
            1
        )
        both;
}

/* ---------------------------------------------------------
   Bootscreen für einen neuen Start vollständig zurücksetzen
   --------------------------------------------------------- */

.receiver:not(.is-powered)
.boot-screen {
    visibility: hidden;

    filter:
        none;

    transform:
        scale(1);
}

/* ---------------------------------------------------------
   Animationen
   --------------------------------------------------------- */

@keyframes boot-screen-handoff {
    0% {
        opacity: 1;

        filter:
            blur(0)
            brightness(1);

        transform:
            scale(1);
    }

    38% {
        opacity: 0.82;

        filter:
            blur(0.25px)
            brightness(0.88);

        transform:
            scale(0.999);
    }

    100% {
        opacity: 0;

        filter:
            blur(1.5px)
            brightness(0.56);

        transform:
            scale(0.994);
    }
}

@keyframes display-signal-handoff {
    0% {
        filter:
            brightness(1);
    }

    48% {
        filter:
            brightness(0.74);
    }

    100% {
        filter:
            brightness(0.92);
    }
}

@keyframes radio-interface-device-ready {
    0% {
        opacity: 0;

        filter:
            blur(1.8px)
            brightness(0.72);

        transform:
            scale(0.994);
    }

    42% {
        opacity: 0.64;

        filter:
            blur(0.6px)
            brightness(0.90);

        transform:
            scale(0.997);
    }

    100% {
        opacity: 1;

        filter:
            blur(0)
            brightness(1);

        transform:
            scale(1);
    }
}

/* ---------------------------------------------------------
   Reduzierte Bewegung
   --------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
    .receiver[data-boot-stage="boot-complete"]
    .boot-screen,

    .receiver[data-boot-stage="boot-complete"]
    .display-screen,

    .receiver.is-ready
    .radio-interface {
        animation-duration: 1ms !important;
        animation-delay: 0ms !important;
    }
}

/* =========================================================
   RETROBASS R-26
   Phase 4.2a
   CRT-inspirierter Spannungsaufbau
   ========================================================= */

/* ---------------------------------------------------------
   Elektrischer Lichtkern im ausgeschalteten Display
   --------------------------------------------------------- */

.display-screen {
    isolation: isolate;
}

.display-screen::after {
    content: "";

    position: absolute;
    z-index: 0;

    inset: 0;

    pointer-events: none;

    opacity: 0;

    background:
        radial-gradient(
            ellipse at center,
            rgba(240, 143, 44, 0.12) 0%,
            rgba(200, 91, 16, 0.045) 34%,
            transparent 68%
        );

    transform:
        scaleX(0.02)
        scaleY(0.012);

    filter:
        blur(2px)
        brightness(1.25);
}

/* ---------------------------------------------------------
   Sobald das Display Spannung erhält
   --------------------------------------------------------- */

.receiver.is-display-powered
.display-screen::after {
    animation:
        retrobass-crt-wake
        720ms
        cubic-bezier(
            0.20,
            0.72,
            0.26,
            1
        )
        forwards;
}

/* ---------------------------------------------------------
   Bootinhalt liegt über dem Lichtkern
   --------------------------------------------------------- */

.boot-screen,
.radio-interface {
    position: absolute;
    z-index: 2;

    inset: 0;
}

/* ---------------------------------------------------------
   Leichte Spannungsschwankung während des Bootens
   --------------------------------------------------------- */

.receiver.is-booting
.display-screen {
    animation:
        retrobass-screen-voltage
        1650ms
        ease-out
        both;
}

/* ---------------------------------------------------------
   Nach READY stabilisiert sich das Display vollständig
   --------------------------------------------------------- */

.receiver.is-ready
.display-screen {
    filter:
        brightness(1)
        contrast(1);

    transition:
        filter 260ms ease-out;
}

/* ---------------------------------------------------------
   CRT-typische horizontale Lichtkante

   Sehr dezent – kein Scanline-Showeffekt.
   --------------------------------------------------------- */

.display-screen::before {
    z-index: 4;

    opacity:
        0.18;

    background:
        repeating-linear-gradient(
            180deg,
            transparent 0,
            transparent 2px,
            rgba(
                222,
                121,
                19,
                0.035
            ) 3px
        ),

        linear-gradient(
            180deg,
            transparent 0%,
            rgba(
                244,
                156,
                62,
                0.026
            ) 49%,
            transparent 52%
        );
}

/* ---------------------------------------------------------
   Animationen
   --------------------------------------------------------- */

@keyframes retrobass-crt-wake {
    0% {
        opacity: 0;

        transform:
            scaleX(0.02)
            scaleY(0.012);

        filter:
            blur(2.4px)
            brightness(1.45);
    }

    16% {
        opacity: 0.92;

        transform:
            scaleX(0.54)
            scaleY(0.018);

        filter:
            blur(1.8px)
            brightness(1.28);
    }

    34% {
        opacity: 0.74;

        transform:
            scaleX(1)
            scaleY(0.045);

        filter:
            blur(1.3px)
            brightness(1.16);
    }

    68% {
        opacity: 0.38;

        transform:
            scaleX(1)
            scaleY(0.82);

        filter:
            blur(0.6px)
            brightness(1.05);
    }

    100% {
        opacity: 0.16;

        transform:
            scaleX(1)
            scaleY(1);

        filter:
            blur(0)
            brightness(1);
    }
}

@keyframes retrobass-screen-voltage {
    0% {
        filter:
            brightness(0.52)
            contrast(0.92);
    }

    12% {
        filter:
            brightness(0.74)
            contrast(1.04);
    }

    18% {
        filter:
            brightness(0.61)
            contrast(0.98);
    }

    31% {
        filter:
            brightness(0.88)
            contrast(1.03);
    }

    100% {
        filter:
            brightness(1)
            contrast(1);
    }
}

/* ---------------------------------------------------------
   Ausschalten

   Das Bild fällt kurz zu einer Linie zusammen,
   ohne einen zusätzlichen Sound.
   --------------------------------------------------------- */

.receiver.is-powering-off
.display-screen::after {
    animation:
        retrobass-crt-sleep
        420ms
        ease-in
        forwards;
}

@keyframes retrobass-crt-sleep {
    0% {
        opacity: 0.12;

        transform:
            scaleX(1)
            scaleY(1);
    }

    58% {
        opacity: 0.50;

        transform:
            scaleX(1)
            scaleY(0.025);

        filter:
            blur(1px)
            brightness(1.22);
    }

    100% {
        opacity: 0;

        transform:
            scaleX(0.025)
            scaleY(0.008);

        filter:
            blur(2px)
            brightness(0.72);
    }
}

/* ---------------------------------------------------------
   Reduzierte Bewegung
   --------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
    .receiver.is-display-powered
    .display-screen::after,

    .receiver.is-booting
    .display-screen,

    .receiver.is-powering-off
    .display-screen::after {
        animation-duration:
            1ms !important;

        animation-delay:
            0ms !important;
    }
}

/* =========================================================
   RETROBASS R-26
   Phase 4.2b
   Phosphor-Nachleuchten und Bildstabilisierung
   ========================================================= */


/* ---------------------------------------------------------
   Bootlogo erhält beim Erwachen einen weichen Lichtsaum
   --------------------------------------------------------- */

.receiver.is-booting
.boot-screen__logo {
    animation:
        retrobass-phosphor-logo-settle
        1150ms
        cubic-bezier(
            0.22,
            0.61,
            0.36,
            1
        )
        430ms
        both;
}


/* ---------------------------------------------------------
   Bootzeilen reagieren auf ihre technischen Zustände
   --------------------------------------------------------- */

.boot-screen__line[data-boot-state="active"] {
    text-shadow:
        0 0 4px rgba(235, 139, 45, 0.34),
        0 0 9px rgba(209, 97, 14, 0.12);
}

.boot-screen__line[data-boot-state="complete"] {
    text-shadow:
        0 0 3px rgba(224, 126, 24, 0.18);
}

.boot-screen__line[data-boot-state="ready"] {
    text-shadow:
        0 0 5px rgba(240, 163, 66, 0.46),
        0 0 11px rgba(213, 107, 17, 0.18);
}


/* ---------------------------------------------------------
   Radioanzeige stabilisiert sich nach der Übergabe
   --------------------------------------------------------- */

.receiver.is-ready
.radio-interface__header,

.receiver.is-ready
.radio-interface__main,

.receiver.is-ready
.radio-interface__footer {
    animation:
        retrobass-phosphor-interface-settle
        920ms
        cubic-bezier(
            0.22,
            0.61,
            0.36,
            1
        )
        both;
}

.receiver.is-ready
.radio-interface__main {
    animation-delay:
        70ms;
}

.receiver.is-ready
.radio-interface__footer {
    animation-delay:
        120ms;
}


/* ---------------------------------------------------------
   Text leuchtet nicht permanent gleich stark

   Nach dem Aufbau bleibt nur die normale,
   bereits vorhandene Displaywirkung bestehen.
   --------------------------------------------------------- */

.receiver.is-ready
.radio-interface__title {
    animation:
        retrobass-title-phosphor-settle
        1050ms
        ease-out
        80ms
        both;
}


/* ---------------------------------------------------------
   Animationen
   --------------------------------------------------------- */

@keyframes retrobass-phosphor-logo-settle {
    0% {
        opacity:
            0;

        filter:
            blur(2.2px)
            brightness(1.34);

        text-shadow:
            0 0 10px rgba(238, 145, 50, 0.36),
            0 0 18px rgba(211, 98, 14, 0.16);

        transform:
            scale(0.992);
    }

    38% {
        opacity:
            1;

        filter:
            blur(0.65px)
            brightness(1.12);

        text-shadow:
            0 0 7px rgba(231, 134, 37, 0.30),
            0 0 13px rgba(211, 98, 14, 0.11);

        transform:
            scale(0.998);
    }

    100% {
        opacity:
            1;

        filter:
            blur(0)
            brightness(1);

        text-shadow:
            0 0 7px rgba(221, 118, 19, 0.30);

        transform:
            scale(1);
    }
}


@keyframes retrobass-phosphor-interface-settle {
    0% {
        opacity:
            0;

        filter:
            blur(1.25px)
            brightness(1.16);

        transform:
            translateY(1px);
    }

    44% {
        opacity:
            0.88;

        filter:
            blur(0.35px)
            brightness(1.06);

        transform:
            translateY(0);
    }

    100% {
        opacity:
            1;

        filter:
            blur(0)
            brightness(1);

        transform:
            translateY(0);
    }
}


@keyframes retrobass-title-phosphor-settle {
    0% {
        text-shadow:
            0 0 9px rgba(242, 157, 66, 0.46),
            0 0 17px rgba(216, 107, 18, 0.20);

        filter:
            blur(0.8px)
            brightness(1.18);
    }

    45% {
        text-shadow:
            0 0 7px rgba(235, 143, 48, 0.34),
            0 0 12px rgba(216, 107, 18, 0.14);

        filter:
            blur(0.25px)
            brightness(1.07);
    }

    100% {
        text-shadow:
            0 0 6px rgba(224, 126, 27, 0.25);

        filter:
            blur(0)
            brightness(1);
    }
}


/* ---------------------------------------------------------
   Ausschalten

   Die Schrift verliert zuerst ihre Leuchtkraft,
   bevor das Bild zur Linie zusammenfällt.
   --------------------------------------------------------- */

.receiver.is-powering-off
.boot-screen,

.receiver.is-powering-off
.radio-interface {
    filter:
        brightness(0.66)
        blur(0.55px);

    transition:
        filter 180ms ease-in,
        opacity 220ms ease-in;
}


/* ---------------------------------------------------------
   Reduzierte Bewegung
   --------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
    .receiver.is-booting
    .boot-screen__logo,

    .receiver.is-ready
    .radio-interface__header,

    .receiver.is-ready
    .radio-interface__main,

    .receiver.is-ready
    .radio-interface__footer,

    .receiver.is-ready
    .radio-interface__title {
        animation-duration:
            1ms !important;

        animation-delay:
            0ms !important;
    }
}

/* =========================================================
   RETROBASS R-26
   Phase 4.2c
   Bildröhren-Tiefe und natürlicher Randabfall
   ========================================================= */


/* ---------------------------------------------------------
   Grundtiefe der inneren Anzeige
   --------------------------------------------------------- */

.display-screen {
    box-shadow:
        inset 0 0 18px
        rgba(
            0,
            0,
            0,
            0.96
        ),

        inset 0 0 34px
        rgba(
            0,
            0,
            0,
            0.68
        ),

        inset 0 -10px 22px
        rgba(
            0,
            0,
            0,
            0.46
        ),

        inset 0 5px 12px
        rgba(
            235,
            145,
            54,
            0.018
        );
}


/* ---------------------------------------------------------
   Während des Bootens baut sich die Bildtiefe auf
   --------------------------------------------------------- */

.receiver.is-booting
.display-screen {
    box-shadow:
        inset 0 0 24px
        rgba(
            0,
            0,
            0,
            0.98
        ),

        inset 0 0 42px
        rgba(
            117,
            47,
            7,
            0.16
        ),

        inset 0 -12px 26px
        rgba(
            0,
            0,
            0,
            0.58
        ),

        inset 0 5px 14px
        rgba(
            242,
            154,
            63,
            0.028
        );

    transition:
        box-shadow 900ms
        cubic-bezier(
            0.22,
            0.61,
            0.36,
            1
        );
}


/* ---------------------------------------------------------
   Nach READY sitzt das Bild ruhig hinter dem Glas
   --------------------------------------------------------- */

.receiver.is-ready
.display-screen {
    box-shadow:
        inset 0 0 16px
        rgba(
            0,
            0,
            0,
            0.92
        ),

        inset 0 0 31px
        rgba(
            154,
            65,
            9,
            0.095
        ),

        inset 0 -9px 20px
        rgba(
            0,
            0,
            0,
            0.44
        ),

        inset 0 5px 11px
        rgba(
            243,
            160,
            69,
            0.022
        );

    transition:
        box-shadow 420ms ease-out;
}


/* ---------------------------------------------------------
   Glasrand bekommt minimale optische Stärke
   --------------------------------------------------------- */

.display-glass {
    box-shadow:
        inset 0 0 0 1px
        rgba(
            255,
            255,
            255,
            0.022
        ),

        inset 0 1px 3px
        rgba(
            255,
            239,
            215,
            0.035
        ),

        inset 0 -8px 18px
        rgba(
            0,
            0,
            0,
            0.76
        ),

        0 4px 10px
        rgba(
            0,
            0,
            0,
            0.42
        ),

        0 0 0 1px
        rgba(
            92,
            48,
            14,
            0.16
        );
}


/* ---------------------------------------------------------
   Displayglas erhält nach dem Hochfahren etwas mehr Tiefe
   --------------------------------------------------------- */

.receiver.is-ready
.display-glass {
    border-color:
        rgba(
            213,
            147,
            68,
            0.36
        );

    box-shadow:
        inset 0 0 0 1px
        rgba(
            255,
            255,
            255,
            0.025
        ),

        inset 0 1px 4px
        rgba(
            255,
            239,
            215,
            0.040
        ),

        inset 0 -9px 20px
        rgba(
            0,
            0,
            0,
            0.74
        ),

        0 4px 11px
        rgba(
            0,
            0,
            0,
            0.44
        ),

        0 0 7px
        rgba(
            192,
            101,
            20,
            0.035
        );

    transition:
        border-color 420ms ease-out,
        box-shadow 420ms ease-out;
}


/* ---------------------------------------------------------
   Ausschalten:
   Bildtiefe fällt vor dem vollständigen Erlöschen zusammen
   --------------------------------------------------------- */

.receiver.is-powering-off
.display-screen {
    box-shadow:
        inset 0 0 26px
        rgba(
            0,
            0,
            0,
            0.98
        ),

        inset 0 0 42px
        rgba(
            89,
            34,
            4,
            0.06
        ),

        inset 0 -12px 25px
        rgba(
            0,
            0,
            0,
            0.72
        );

    transition:
        box-shadow 360ms ease-in;
}


/* ---------------------------------------------------------
   Reduzierte Bewegung
   --------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
    .receiver.is-booting
    .display-screen,

    .receiver.is-ready
    .display-screen,

    .receiver.is-ready
    .display-glass,

    .receiver.is-powering-off
    .display-screen {
        transition-duration:
            1ms !important;
    }
}

/* =========================================================
   RETROBASS R-26
   Phase 4.2d
   Glasreaktion und Raumlicht
   ========================================================= */


/* ---------------------------------------------------------
   Glas bekommt eine sehr dezente innere Lichtkante
   --------------------------------------------------------- */

.display-glass::before {
    background:
        radial-gradient(
            ellipse at center,
            rgba(
                255,
                239,
                216,
                0.34
            ),
            transparent 70%
        ),

        linear-gradient(
            118deg,
            transparent 0 42%,
            rgba(
                255,
                221,
                181,
                0.028
            ) 49%,
            transparent 58%
        );

    opacity:
        0.14;

    filter:
        blur(7px)
        brightness(1);

    transition:
        opacity 520ms ease,
        filter 520ms ease,
        transform 520ms ease;
}


/* ---------------------------------------------------------
   Nach dem Hochfahren reagiert das Glas minimal auf Raumlicht
   --------------------------------------------------------- */

.receiver.is-ready
.display-glass::before {
    opacity:
        0.17;

    filter:
        blur(6.4px)
        brightness(1.04);

    transform:
        rotate(-18deg)
        translate(
            0.5px,
            -0.3px
        );
}


/* ---------------------------------------------------------
   Zusätzliche feine Reflexionskante
   --------------------------------------------------------- */

.display-glass::after {
    background:
        linear-gradient(
            112deg,
            transparent 0 52%,
            rgba(
                255,
                255,
                255,
                0.018
            ) 55%,
            rgba(
                255,
                232,
                204,
                0.032
            ) 58%,
            transparent 63%
        ),

        linear-gradient(
            180deg,
            rgba(
                255,
                255,
                255,
                0.020
            ),
            transparent 13%
        );

    opacity:
        0.72;

    transition:
        opacity 420ms ease;
}


/* ---------------------------------------------------------
   Displayglas im ausgeschalteten Zustand:
   schwer, dunkel, aber nicht tot
   --------------------------------------------------------- */

.receiver:not(.is-powered)
.display-glass {
    filter:
        brightness(0.62)
        saturate(0.82);

    border-color:
        rgba(
            111,
            71,
            32,
            0.20
        );

    transition:
        filter 420ms ease,
        border-color 420ms ease,
        box-shadow 420ms ease;
}


/* ---------------------------------------------------------
   Während des Bootens:
   Glas erhält langsam seine volle Materialwirkung
   --------------------------------------------------------- */

.receiver.is-booting
.display-glass {
    filter:
        brightness(0.92)
        saturate(0.96);
}


/* ---------------------------------------------------------
   Bereit:
   endgültige Glaswirkung
   --------------------------------------------------------- */

.receiver.is-ready
.display-glass {
    filter:
        brightness(1)
        saturate(1);

    transition:
        filter 380ms ease-out,
        border-color 420ms ease-out,
        box-shadow 420ms ease-out;
}


/* ---------------------------------------------------------
   Ausschalten:
   Reflexion verliert zuerst ihre Spannung
   --------------------------------------------------------- */

.receiver.is-powering-off
.display-glass::before {
    opacity:
        0.06;

    filter:
        blur(8px)
        brightness(0.72);

    transition:
        opacity 180ms ease-in,
        filter 180ms ease-in;
}

.receiver.is-powering-off
.display-glass::after {
    opacity:
        0.18;

    transition:
        opacity 180ms ease-in;
}


/* ---------------------------------------------------------
   Reduzierte Bewegung
   --------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
    .display-glass::before,
    .display-glass::after,
    .receiver:not(.is-powered)
    .display-glass,
    .receiver.is-booting
    .display-glass,
    .receiver.is-ready
    .display-glass,
    .receiver.is-powering-off
    .display-glass::before,
    .receiver.is-powering-off
    .display-glass::after {
        transition-duration:
            1ms !important;
    }
}