/* Radia's first-session entrance; kept separate from application surfaces. */
.radia-intro-active, .radia-intro-active body { overflow: hidden; }
.radia-intro {
    --intro-green: #82ffc1;
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    height: 100dvh;
    max-width: none;
    max-height: none;
    margin: 0;
    padding: 0;
    border: 0;
    overflow: hidden;
    background: transparent;
    color: #eefbf5;
    font-family: var(--font-ui);
}
.radia-intro::backdrop { background: transparent; }
.radia-intro-sr {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
}
.radia-intro-shutter {
    position: absolute;
    inset: 0;
    background: #020605;
    clip-path: circle(0 at var(--intro-x, 50%) var(--intro-y, 50%));
}
.radia-intro[open] .radia-intro-shutter {
    animation: radia-portal 950ms cubic-bezier(.65, 0, .2, 1) both;
}
.radia-intro-rain, .radia-intro-vignette { position: absolute; inset: 0; width: 100%; height: 100%; }
.radia-intro-rain { opacity: 0; transition: opacity 1.2s ease; }
.radia-intro.is-connected .radia-intro-rain { opacity: .32; }
.radia-intro-vignette {
    opacity: 0;
    background: radial-gradient(ellipse at center, rgba(2, 6, 5, .3), #020605 85%);
    transition: opacity 1s;
}
.radia-intro.is-connected .radia-intro-vignette { opacity: 1; }
.radia-intro-top, .radia-intro-bottom {
    position: absolute;
    z-index: 2;
    left: clamp(22px, 5vw, 80px);
    right: clamp(22px, 5vw, 80px);
}
.radia-intro-top {
    top: max(26px, env(safe-area-inset-top));
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.radia-intro-wordmark { font: 600 12px var(--font-display); letter-spacing: .22em; }
.radia-intro-wordmark span { color: #88a99a; font: 10px var(--font-ui); letter-spacing: .15em; }
.radia-intro-stage {
    position: absolute;
    inset: 18% 24px 16%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 1s, transform 1s;
}
.radia-intro.is-connected .radia-intro-stage { opacity: 1; transform: none; }
.radia-intro-signal { color: #a0c4b0; font: 10px var(--font-ui); letter-spacing: .26em; }
.radia-intro-signal > span {
    display: inline-block;
    width: 5px;
    height: 5px;
    margin: 0 8px 2px 0;
    border-radius: 50%;
    background: var(--intro-green);
    box-shadow: 0 0 12px rgba(130, 255, 193, .65);
}
.radia-intro-core { width: 132px; height: 132px; flex-shrink: 0; margin: 24px 0; }
.radia-intro-logo {
    width: 100%;
    height: 100%;
    object-fit: contain;
    filter: drop-shadow(0 0 18px rgba(130, 255, 193, .16));
}
.radia-intro-message { max-width: 1040px; font-family: 'Space Grotesk', var(--font-ui); font-weight: 400; line-height: 1.16; letter-spacing: -.035em; }
.radia-intro-message > span { display: block; }
.radia-intro-greeting { min-height: 1.3em; font-size: clamp(25px, 3.4vw, 48px); }
.radia-intro-welcome { min-height: 2.4em; margin-top: 12px; color: var(--intro-green); font-size: clamp(34px, 5.6vw, 76px); text-wrap: balance; }
.radia-intro-fact-label { margin-top: 22px; color: #91ac9e; font: 11px/1.5 var(--font-ui); letter-spacing: .18em; }
.radia-intro-fact-label[hidden] { display: none; }
.radia-intro.is-login .radia-intro-greeting { font-size: clamp(30px, 4.5vw, 64px); }
.radia-intro.is-login .radia-intro-welcome {
    max-width: 840px;
    min-height: 4.5em;
    font-size: clamp(18px, 2.2vw, 28px);
    font-weight: 400;
    line-height: 1.5;
    letter-spacing: -.01em;
    color: #c9eedb;
}
.radia-intro-message .is-typing::after {
    content: "";
    display: inline-block;
    width: 2px;
    height: .8em;
    margin-left: 5px;
    background: var(--intro-green);
    box-shadow: 0 0 12px rgba(130, 255, 193, .4);
}
.radia-intro-caption { margin-top: 24px; color: #91ac9e; font-size: 12px; letter-spacing: .12em; opacity: 0; transition: opacity .7s; }
.radia-intro.is-complete .radia-intro-caption { opacity: 1; }
.radia-intro-bottom { bottom: max(30px, env(safe-area-inset-bottom)); }
.radia-intro-progress { height: 1px; background: rgba(130, 255, 193, .15); overflow: hidden; }
.radia-intro-progress > span { display: block; height: 100%; background: var(--intro-green); transform: scaleX(0); transform-origin: left; }
.radia-intro[open] .radia-intro-progress > span { animation: radia-progress 6.55s linear both; }
.radia-intro.is-login .radia-intro-progress > span { animation: none; transform: scaleX(.08); transition: transform 1s ease; }
.radia-intro.is-login.is-connected .radia-intro-progress > span { transform: scaleX(.25); }
.radia-intro.is-login.is-fact-ready .radia-intro-progress > span { transform: scaleX(.65); }
.radia-intro.is-login.is-complete .radia-intro-progress > span { transform: scaleX(1); }
.radia-intro-coordinates { display: flex; justify-content: space-between; gap: 16px; margin-top: 16px; color: #88a99a; font-size: 9px; letter-spacing: .18em; }
.radia-intro.is-leaving .radia-intro-stage { opacity: 0; transform: scale(1.06); transition-duration: .5s; }
.radia-intro.is-leaving .radia-intro-rain { opacity: 0; transition-duration: .5s; }
.radia-arrival::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 9999;
    pointer-events: none;
    background: #020605;
    animation: radia-arrival-veil 1s ease both;
}
.radia-arrival .auth-card { animation: radia-arrival-card 1.2s cubic-bezier(.16, 1, .3, 1) both; }
@keyframes radia-portal { to { clip-path: circle(150vmax at var(--intro-x, 50%) var(--intro-y, 50%)); } }
@keyframes radia-progress { to { transform: scaleX(1); } }
@keyframes radia-arrival-veil { from { opacity: 1; } to { opacity: 0; } }
@keyframes radia-arrival-card { from { opacity: 0; transform: translateY(26px) scale(.97); } to { opacity: 1; transform: none; } }
@media (max-width: 600px) {
    .radia-intro-wordmark span { display: none; }
    .radia-intro-core { width: 108px; height: 108px; margin: 22px 0; }
    .radia-intro-coordinates { font-size: 8px; letter-spacing: .08em; }
}
@media (max-height: 600px) {
    .radia-intro-stage { inset: 70px 24px 75px; }
    .radia-intro-core { width: 64px; height: 64px; margin: 12px 0; }
    .radia-intro-greeting { font-size: 24px; }
    .radia-intro-welcome { font-size: 32px; min-height: 1.2em; }
    .radia-intro-caption { margin-top: 12px; }
    .radia-intro.is-login .radia-intro-core { width: 40px; height: 40px; margin: 6px 0; }
    .radia-intro.is-login .radia-intro-greeting { font-size: 24px; }
    .radia-intro.is-login .radia-intro-welcome { font-size: 16px; line-height: 1.35; min-height: 3.9em; }
    .radia-intro.is-login .radia-intro-fact-label { margin-top: 8px; font-size: 9px; }
}
@media (prefers-reduced-motion: reduce) {
    .radia-intro *, .radia-arrival::before, .radia-arrival .auth-card { animation: none !important; transition: none !important; }
    .radia-arrival::before { display: none; }
}