.filmnoir-tint {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 10000;
    background-color: #8c7355;
    mix-blend-mode: color;
}

.filmnoir-effects {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 1100;
}

/* Film grain */
.filmnoir-grain {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="200" height="200"><filter id="n"><feTurbulence type="fractalNoise" baseFrequency="0.8" numOctaves="3" stitchTiles="stitch"/></filter><rect width="200" height="200" filter="url(%23n)" opacity="0.4"/></svg>');
    animation: grain-dance 0.2s steps(4) infinite;
    pointer-events: none;
    mix-blend-mode: overlay;
    opacity: 0.3;
}

/* Vignette */
.filmnoir-vignette {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    background: radial-gradient(circle at center, transparent 50%, rgba(0,0,0,0.8) 120%);
    box-shadow: inset 0 0 100px rgba(0,0,0,0.6);
}

/* Occasional flicker and scratch */
.filmnoir-scratches {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    background: linear-gradient(to right, transparent 50%, rgba(255,255,255,0.2) 51%, transparent 52%);
    background-size: 200% 100%;
    animation: scratch 4s infinite linear, flicker 6s infinite alternate;
    opacity: 0.2;
    mix-blend-mode: screen;
}

@keyframes grain-dance {
    0% { transform: translate(0,0); }
    25% { transform: translate(-5%,-5%); }
    50% { transform: translate(-10%,5%); }
    75% { transform: translate(5%,-10%); }
    100% { transform: translate(0,0); }
}

@keyframes scratch {
    0% { background-position: -200% 0; }
    10% { background-position: 200% 0; }
    100% { background-position: 200% 0; }
}

@keyframes flicker {
    0% { opacity: 0.2; }
    5% { opacity: 0.1; }
    10% { opacity: 0.3; }
    15% { opacity: 0.2; }
    50% { opacity: 0.15; }
    55% { opacity: 0.25; }
    100% { opacity: 0.2; }
}