:root {
    --mandre-fire-intensity: 100;
    --mandre-fire-darkness: 18;
    --mandre-fire-bg-image: url('../img/mandre-fire-bg.png');
    --mandre-intensity: calc(var(--mandre-fire-intensity) / 100);
    --mandre-darkness: calc(var(--mandre-fire-darkness) / 100);
}

* {
    box-sizing: border-box;
}

html {
    min-height: 100%;
    background: #000;
}

body.mandre-fire-background-body {
    min-height: 100%;
    margin: 0;
    overflow: hidden;
    background: #000;
    color: #fff;
}

body.mandre-fire-background-body *:focus {
    outline: 2px solid rgba(255, 153, 31, 0.75);
    outline-offset: 4px;
}

.screen-reader-text {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.mandre-fire-bg-page {
    position: relative;
    width: 100vw;
    min-height: 100vh;
    overflow: hidden;
    isolation: isolate;
    background: #000;
}

.mandre-fire-bg-image,
.mandre-fire-bg-flicker,
.mandre-fire-bg-heat,
.mandre-fire-bg-smoke,
.mandre-fire-bg-vignette,
.mandre-fire-bg-canvas {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
}

.mandre-fire-bg-image {
    z-index: -8;
    background-image: var(--mandre-fire-bg-image);
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    transform: scale(1.045) translate3d(0, 0, 0);
    filter: saturate(calc(1.08 + (0.22 * var(--mandre-intensity)))) contrast(1.08) brightness(0.98);
    will-change: transform, filter, background-position;
}

body[data-mandre-animation="on"] .mandre-fire-bg-image {
    animation:
        mandreFireBgBreath 18s ease-in-out infinite alternate,
        mandreFireBgFlicker 2.7s steps(3, end) infinite;
}

.mandre-fire-bg-flicker {
    z-index: -7;
    pointer-events: none;
    opacity: calc(0.55 * var(--mandre-intensity));
    background:
        radial-gradient(ellipse at 50% 52%, rgba(255, 187, 45, 0.22), rgba(255, 66, 0, 0.11) 22%, transparent 45%),
        radial-gradient(ellipse at 50% 76%, rgba(255, 97, 0, 0.26), rgba(255, 97, 0, 0.08) 20%, transparent 56%),
        linear-gradient(180deg, rgba(255, 102, 0, 0.06), transparent 42%, rgba(255, 120, 0, 0.08));
    mix-blend-mode: screen;
    will-change: opacity, transform;
}

body[data-mandre-animation="on"] .mandre-fire-bg-flicker {
    animation: mandreFireGlowPulse 1.85s ease-in-out infinite alternate;
}

.mandre-fire-bg-heat {
    z-index: -6;
    pointer-events: none;
    opacity: calc(0.42 * var(--mandre-intensity));
    background:
        repeating-linear-gradient(90deg, transparent 0 18px, rgba(255,255,255,0.025) 18px 20px, transparent 20px 44px),
        repeating-linear-gradient(0deg, transparent 0 24px, rgba(255,120,0,0.028) 24px 26px, transparent 26px 52px);
    mix-blend-mode: overlay;
    filter: blur(0.8px);
    transform: translate3d(0, 0, 0);
    will-change: transform, opacity;
}

body[data-mandre-animation="on"] .mandre-fire-bg-heat {
    animation: mandreHeatWave 5.4s linear infinite;
}

body[data-mandre-heat="off"] .mandre-fire-bg-heat {
    display: none;
}

.mandre-fire-bg-smoke {
    z-index: -4;
    pointer-events: none;
    opacity: 0.5;
    background:
        radial-gradient(ellipse at 18% 20%, rgba(255,255,255,0.08), transparent 32%),
        radial-gradient(ellipse at 82% 18%, rgba(255,255,255,0.055), transparent 30%),
        radial-gradient(ellipse at 12% 70%, rgba(255,255,255,0.04), transparent 28%),
        radial-gradient(ellipse at 90% 70%, rgba(255,255,255,0.04), transparent 30%);
    mix-blend-mode: screen;
    filter: blur(10px);
    transform: scale(1.08);
    will-change: transform, opacity;
}

body[data-mandre-animation="on"] .mandre-fire-bg-smoke {
    animation: mandreSmokeMove 24s ease-in-out infinite alternate;
}

.mandre-fire-bg-canvas {
    z-index: -5;
    pointer-events: none;
    display: block;
}

body[data-mandre-particles="off"] .mandre-fire-bg-canvas {
    display: none;
}

.mandre-fire-bg-vignette {
    z-index: -3;
    pointer-events: none;
    background:
        linear-gradient(180deg, rgba(0, 0, 0, calc(0.10 + var(--mandre-darkness))) 0%, transparent 28%, rgba(0, 0, 0, calc(0.16 + var(--mandre-darkness))) 100%),
        radial-gradient(ellipse at center, transparent 28%, rgba(0,0,0,0.46) 72%, rgba(0,0,0,0.86) 100%);
}

body[data-mandre-animation="off"] .mandre-fire-bg-image,
body[data-mandre-animation="off"] .mandre-fire-bg-flicker,
body[data-mandre-animation="off"] .mandre-fire-bg-heat,
body[data-mandre-animation="off"] .mandre-fire-bg-smoke {
    animation: none !important;
}

body[data-mandre-animation="off"] .mandre-fire-bg-canvas {
    display: none;
}

@keyframes mandreFireBgBreath {
    0% {
        transform: scale(1.035) translate3d(-0.5vw, -0.25vh, 0);
        background-position: 50% 50%;
    }
    37% {
        transform: scale(1.065) translate3d(0.3vw, 0.15vh, 0);
        background-position: 50.7% 49.6%;
    }
    72% {
        transform: scale(1.052) translate3d(-0.15vw, 0.32vh, 0);
        background-position: 49.4% 50.8%;
    }
    100% {
        transform: scale(1.085) translate3d(0.55vw, -0.15vh, 0);
        background-position: 50.5% 49.8%;
    }
}

@keyframes mandreFireBgFlicker {
    0%, 100% {
        filter: saturate(calc(1.1 + (0.22 * var(--mandre-intensity)))) contrast(1.08) brightness(0.98);
    }
    42% {
        filter: saturate(calc(1.18 + (0.26 * var(--mandre-intensity)))) contrast(1.12) brightness(1.04);
    }
    58% {
        filter: saturate(calc(1.02 + (0.20 * var(--mandre-intensity)))) contrast(1.04) brightness(0.94);
    }
}

@keyframes mandreFireGlowPulse {
    0% {
        opacity: calc(0.32 * var(--mandre-intensity));
        transform: scale(1);
    }
    35% {
        opacity: calc(0.68 * var(--mandre-intensity));
        transform: scale(1.018);
    }
    55% {
        opacity: calc(0.44 * var(--mandre-intensity));
        transform: scale(1.006);
    }
    100% {
        opacity: calc(0.74 * var(--mandre-intensity));
        transform: scale(1.026);
    }
}

@keyframes mandreHeatWave {
    0% { transform: translate3d(-16px, -10px, 0) skewX(-0.6deg); opacity: calc(0.25 * var(--mandre-intensity)); }
    25% { transform: translate3d(14px, 12px, 0) skewX(0.8deg); opacity: calc(0.46 * var(--mandre-intensity)); }
    50% { transform: translate3d(-8px, 24px, 0) skewX(-0.3deg); opacity: calc(0.34 * var(--mandre-intensity)); }
    75% { transform: translate3d(18px, 4px, 0) skewX(0.7deg); opacity: calc(0.48 * var(--mandre-intensity)); }
    100% { transform: translate3d(-16px, -10px, 0) skewX(-0.6deg); opacity: calc(0.25 * var(--mandre-intensity)); }
}

@keyframes mandreSmokeMove {
    0% { transform: scale(1.08) translate3d(-2.6vw, -1.4vh, 0); opacity: 0.34; }
    50% { transform: scale(1.12) translate3d(1.8vw, 0.6vh, 0); opacity: 0.52; }
    100% { transform: scale(1.1) translate3d(3vw, -0.8vh, 0); opacity: 0.38; }
}

@media (prefers-reduced-motion: reduce) {
    .mandre-fire-bg-image,
    .mandre-fire-bg-flicker,
    .mandre-fire-bg-heat,
    .mandre-fire-bg-smoke {
        animation: none !important;
    }

    .mandre-fire-bg-canvas {
        display: none !important;
    }
}