/* SchoolGrid — fullscreen branded idle screensaver (kiosk + auth login) */
.sg-screensaver {
    position: fixed;
    inset: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #060d18;
    background-image:
        radial-gradient(ellipse 80% 50% at 50% 0%, rgba(0, 137, 208, 0.18), transparent 55%),
        radial-gradient(ellipse 60% 40% at 80% 100%, rgba(140, 198, 63, 0.12), transparent 50%),
        linear-gradient(165deg, #060d18 0%, var(--sg-navy) 45%, #0a1628 100%);
    color: #fff;
    cursor: default;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.6s ease, visibility 0.6s ease;
}

.sg-screensaver.sg-screensaver--active {
    opacity: 1;
    visibility: visible;
}

.sg-screensaver__grid {
    position: absolute;
    inset: 0;
    opacity: 0.35;
    background-image:
        linear-gradient(rgba(0, 137, 208, 0.07) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 137, 208, 0.07) 1px, transparent 1px);
    background-size: 48px 48px;
    animation: sg-screensaver-drift 28s linear infinite;
    pointer-events: none;
}

.sg-screensaver__glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    pointer-events: none;
    animation: sg-screensaver-pulse 6s ease-in-out infinite;
}

.sg-screensaver__glow--blue {
    width: 320px;
    height: 320px;
    top: 15%;
    left: 10%;
    background: rgba(0, 137, 208, 0.25);
}

.sg-screensaver__glow--green {
    width: 280px;
    height: 280px;
    bottom: 12%;
    right: 8%;
    background: rgba(140, 198, 63, 0.2);
    animation-delay: -3s;
}

.sg-screensaver__content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 2rem;
    max-width: 90vw;
    animation: sg-screensaver-rise 0.8s ease-out;
}

.sg-screensaver__logo .sg-logo {
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.sg-screensaver__logo .sg-logo__mark {
    width: 96px;
    height: 96px;
    animation: sg-screensaver-logo 4s ease-in-out infinite;
}

.sg-screensaver__logo .sg-logo__wordmark {
    font-size: clamp(2rem, 6vw, 3rem);
}

.sg-screensaver__logo .sg-logo__tagline {
    margin-top: 1.25rem;
    color: rgba(255, 255, 255, 0.75);
    font-size: clamp(1rem, 2.5vw, 1.35rem);
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: none;
}

.sg-screensaver__clock {
    margin: 2rem 0 0;
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 300;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.06em;
    color: #fff;
    text-shadow: 0 0 40px rgba(0, 137, 208, 0.35);
}

.sg-screensaver__hint {
    margin: 2.5rem 0 0;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.35);
    animation: sg-screensaver-hint 2.5s ease-in-out infinite;
}

body.sg-screensaver-active {
    overflow: hidden;
}

body.sg-screensaver-active .sg-kiosk-header,
body.sg-screensaver-active .sg-kiosk-main,
body.sg-screensaver-active .sg-auth-wrapper {
    visibility: hidden;
}

@keyframes sg-screensaver-drift {
    from { transform: translate(0, 0); }
    to { transform: translate(48px, 48px); }
}

@keyframes sg-screensaver-pulse {
    0%, 100% { opacity: 0.6; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.08); }
}

@keyframes sg-screensaver-logo {
    0%, 100% { transform: scale(1); filter: drop-shadow(0 0 24px rgba(0, 137, 208, 0.35)); }
    50% { transform: scale(1.04); filter: drop-shadow(0 0 36px rgba(140, 198, 63, 0.4)); }
}

@keyframes sg-screensaver-rise {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes sg-screensaver-hint {
    0%, 100% { opacity: 0.35; }
    50% { opacity: 0.65; }
}