:root{
    --space:#02040f;
    --deep-blue:#0b1235;
    --signal:#79d8ff;
    --signal-bright:#a4c7ff;
    --text:#d8e6ff;
    --line:rgba(121,216,255,.35);
    --panel:rgba(4,8,24,.78);
}

*{
    box-sizing:border-box;
}

html{
    min-height:100%;
    background:var(--space);
}

body{
    min-height:100vh;
    margin:0;
    overflow-x:hidden;
    background:
        radial-gradient(circle at 50% 30%,rgba(26,55,124,.55),transparent 45%),
        linear-gradient(180deg,var(--deep-blue),var(--space) 70%);
    color:white;
    font-family:Arial,Helvetica,sans-serif;
}

.stars{
    position:fixed;
    inset:0;
    background-image:
        radial-gradient(white 1px,transparent 1px),
        radial-gradient(#88bfff 1px,transparent 1px);
    background-position:0 0,60px 80px;
    background-size:120px 120px,220px 220px;
    opacity:.3;
    pointer-events:none;
    animation:drift 140s linear infinite;
}

.transmission-shell{
    position:relative;
    z-index:1;
    width:min(100%,760px);
    min-height:100vh;
    margin:0 auto;
    padding:28px 20px 56px;
}

.return-link{
    display:inline-block;
    color:var(--signal-bright);
    font-family:monospace;
    font-size:.75rem;
    letter-spacing:.14em;
    line-height:1.5;
    text-decoration:none;
}

.transmission{
    padding-top:clamp(52px,12vh,110px);
    text-align:center;
    animation:arrive 2.4s ease-out both;
}

.eyebrow,
.signal-label{
    color:var(--signal);
    font-family:monospace;
    font-size:.72rem;
    letter-spacing:.24em;
}

h1{
    margin:22px 0 0;
    font-size:clamp(3rem,14vw,6.8rem);
    font-weight:700;
    letter-spacing:.08em;
    line-height:.92;
    text-shadow:0 0 18px rgba(77,168,255,.65),0 0 60px rgba(77,168,255,.35);
}

.origin{
    max-width:580px;
    margin:34px auto 0;
    color:var(--text);
    font-size:clamp(1rem,4.3vw,1.2rem);
    line-height:1.75;
}

.seed{
    position:relative;
    width:18px;
    height:28px;
    margin:34px auto 0;
}

.seed-core,
.seed-halo{
    position:absolute;
    inset:50% auto auto 50%;
    border-radius:50%;
    transform:translate(-50%,-50%);
}

.seed-core{
    width:8px;
    height:13px;
    background:radial-gradient(circle at 40% 35%,white,var(--signal) 45%,#315fa8 100%);
    box-shadow:0 0 9px rgba(121,216,255,.85);
    animation:seedPulse 3s ease-in-out infinite;
}

.seed-halo{
    width:18px;
    height:28px;
    border:1px solid rgba(121,216,255,.3);
    box-shadow:0 0 14px rgba(121,216,255,.25);
    animation:haloPulse 3s ease-in-out infinite;
}

.pre-transmission{
    min-height:148px;
    padding-top:66px;
    color:var(--signal);
    font-family:monospace;
    font-size:.85rem;
    letter-spacing:.14em;
    text-align:center;
}

.receiver{
    margin-top:34px;
    padding:26px 20px;
    border:1px solid var(--line);
    background:var(--panel);
    box-shadow:0 0 55px rgba(40,111,214,.13),inset 0 0 30px rgba(40,111,214,.08);
    backdrop-filter:blur(8px);
}

.receiver audio{
    width:100%;
    margin-bottom:24px;
}

.signal-label{
    margin:0;
}

.player-status{
    min-height:1.5em;
    margin:12px 0 24px;
    color:var(--text);
    font-family:monospace;
    font-size:.85rem;
}

.transport{
    display:grid;
    gap:22px;
}

.play-toggle{
    min-height:48px;
    border:1px solid var(--signal);
    background:transparent;
    color:white;
    cursor:pointer;
    font:inherit;
    letter-spacing:.2em;
    transition:background .3s,box-shadow .3s;
}

.play-toggle:hover:not(:disabled){
    background:rgba(77,168,255,.18);
    box-shadow:0 0 28px rgba(77,168,255,.3);
}

.play-toggle:disabled{
    cursor:not-allowed;
    opacity:.45;
}

.button-label{
    margin-left:8px;
}

.timeline{
    min-width:0;
}

input[type="range"]{
    width:100%;
    accent-color:var(--signal);
    cursor:pointer;
}

input[type="range"]:disabled{
    cursor:not-allowed;
    opacity:.45;
}

.time{
    display:flex;
    justify-content:space-between;
    margin-top:8px;
    color:var(--signal-bright);
    font-family:monospace;
    font-size:.78rem;
}

.volume-control{
    display:grid;
    grid-template-columns:auto 1fr;
    align-items:center;
    gap:16px;
    margin-top:24px;
    color:var(--signal-bright);
    font-family:monospace;
    font-size:.72rem;
    letter-spacing:.16em;
}

a:focus-visible,
button:focus-visible,
input:focus-visible{
    outline:2px solid white;
    outline-offset:4px;
}

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

@keyframes drift{
    from{transform:translateY(0)}
    to{transform:translateY(-420px)}
}

@keyframes arrive{
    from{opacity:0;transform:translateY(18px)}
    to{opacity:1;transform:translateY(0)}
}

@keyframes seedPulse{
    0%,100%{opacity:.72;box-shadow:0 0 8px rgba(121,216,255,.65)}
    50%{opacity:1;box-shadow:0 0 14px rgba(121,216,255,.95)}
}

@keyframes haloPulse{
    0%,100%{opacity:.35;transform:translate(-50%,-50%) scale(.92)}
    50%{opacity:.7;transform:translate(-50%,-50%) scale(1.05)}
}

@media (min-width:640px){
    .transmission-shell{
        padding-right:32px;
        padding-left:32px;
    }

    .receiver{
        padding:34px;
    }

    .transport{
        grid-template-columns:150px 1fr;
        align-items:center;
    }
}

@media (prefers-reduced-motion:reduce){
    .stars,
    .transmission,
    .seed-core,
    .seed-halo{
        animation:none;
    }

    .play-toggle{
        transition:none;
    }
}