:root{
    /* Bright popping blue background */
    --bg: #00d242;       /* vivid blue */
    --text: #ffffff;     /* white for strong contrast */

    /* Light blue blob tones */
    --blue-100: #dbeafe;
    --blue-200: #bffec7;
    --blue-300: #93fd98;
}

/* Base */
* { box-sizing: border-box; }

html, body { height: 100%; }

body{
    margin: 0;
    font-family: "Poppins", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    overflow: hidden; /* one-screen, centered */
}

/* Grain overlay (subtle, like your example) */
body::after{
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    opacity: 0.08;               /* tweak for visibility on bright blue */
    background: #000;
    filter: url(#noiseFilter);
    mix-blend-mode: multiply;
}

/* Centered content */
.center{
    position: relative;
    z-index: 2;
    height: 100dvh;
    max-width: 860px;
    margin: 0 auto;
    display: grid;
    place-content: center;
    text-align: center;
    padding: 2rem;
}

/* Logo lockup */
.logo{
    margin: 0 0 0.5rem 0;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    line-height: 1.05;
    font-size: clamp(2.25rem, 6vw, 4.25rem);
    font-weight: 400;                /* base; spans handle contrast */
}

.logo-strong{
    font-weight: 700;                /* CONVINE bold */
}

.logo-light{
    font-weight: 400;                /* STUDIOS regular */
    opacity: 0.95;
}

.subtitle{
    margin: 0.5rem 0 0 0;
    font-size: clamp(0.95rem, 1.8vw, 1.15rem);
    letter-spacing: 0.32em;
    text-transform: uppercase;
    opacity: 0.85;
}

/* Animated blobs (light blues) */
.blob-wrap{
    position: fixed;
    inset: 0;
    display: grid;
    place-items: center;
    z-index: 1;
    pointer-events: none;
}

.blob{
    position: absolute;
    border-radius: 50%;
    filter: blur(65px);
    opacity: 0.55;
    will-change: transform;
}

.b1{
    width: 44vmin; height: 44vmin;
    background: var(--blue-300);
    transform: translate(-22vmin, -8vmin) scale(1);
    animation: float1 22s ease-in-out infinite;
}

.b2{
    width: 46vmin; height: 46vmin;
    background: var(--blue-200);
    transform: translate(18vmin, 10vmin) scale(1.06);
    animation: float2 28s ease-in-out infinite;
}

.b3{
    width: 38vmin; height: 38vmin;
    background: var(--blue-100);
    transform: translate(2vmin, -24vmin) scale(1.1);
    animation: float3 26s ease-in-out infinite;
}

/* Gentle motion */
@keyframes float1{
    0%   { transform: translate(-22vmin, -8vmin) scale(1); }
    50%  { transform: translate(-10vmin,  4vmin)  scale(1.12); }
    100% { transform: translate(-22vmin, -8vmin)  scale(1); }
}
@keyframes float2{
    0%   { transform: translate(18vmin, 10vmin) scale(1.06); }
    50%  { transform: translate(6vmin,  -6vmin)  scale(1.18); }
    100% { transform: translate(18vmin, 10vmin) scale(1.06); }
}
@keyframes float3{
    0%   { transform: translate(2vmin, -24vmin) scale(1.1); }
    50%  { transform: translate(-12vmin, -14vmin) scale(1); }
    100% { transform: translate(2vmin, -24vmin) scale(1.1); }
}

/* Motion accessibility */
@media (prefers-reduced-motion: reduce){
    .blob { animation: none; }
    body::after { opacity: 0.04; }
}