/* ── Cosmic Background ── */
#cosmic-canvas {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    background: var(--bg-primary);
}

html {
    background: var(--bg-primary);
}

body {
    background: transparent;
}

/* Note: .header already has its own position:sticky + z-index:100 from
   header.css — leave it alone here so the mobile nav overlay (which lives
   inside .header) keeps stacking above main's content. */
main,
.footer {
    position: relative;
    z-index: 1;
}

/* ── Scroll Reveal ── */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s ease, transform 0.7s ease;
    transition-delay: calc(var(--stagger-i, 0) * 60ms);
    will-change: opacity, transform;
}

.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ── Glow Spotlight Cards ── */
.glow-card {
    position: relative;
    overflow: hidden;
    isolation: isolate;
}

.glow-card::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    background: radial-gradient(320px circle at var(--mx, 50%) var(--my, 50%), rgba(255, 215, 0, 0.3), transparent 72%);
    opacity: 0;
    transition: opacity 0.35s ease;
    pointer-events: none;
}

.glow-card:hover::before {
    opacity: 1;
}

/* ── Hero Title Glow ── */
.hero h1 {
    text-shadow: 0 0 28px rgba(255, 215, 0, 0.45), 0 0 80px rgba(123, 104, 238, 0.35);
    animation: pulse-glow 4s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% { text-shadow: 0 0 28px rgba(255, 215, 0, 0.45), 0 0 80px rgba(123, 104, 238, 0.35); }
    50% { text-shadow: 0 0 42px rgba(255, 215, 0, 0.7), 0 0 110px rgba(123, 104, 238, 0.55); }
}

/* ── Flying Saucer ── */
.ufo {
    position: fixed;
    top: 12vh;
    left: -220px;
    width: 130px;
    height: auto;
    z-index: 0;
    pointer-events: none;
    opacity: 0;
    filter: drop-shadow(0 0 18px rgba(123, 104, 238, 0.45));
}

.ufo.flying-ltr {
    animation: ufo-fly-ltr var(--ufo-duration, 22s) linear forwards;
}

.ufo.flying-rtl {
    animation: ufo-fly-rtl var(--ufo-duration, 22s) linear forwards;
}

@keyframes ufo-fly-ltr {
    0%   { left: -220px; opacity: 0; transform: translateY(0) rotate(-3deg); }
    8%   { opacity: 0.95; }
    25%  { transform: translateY(-18px) rotate(2deg); }
    50%  { transform: translateY(10px) rotate(-2deg); }
    75%  { transform: translateY(-12px) rotate(3deg); }
    92%  { opacity: 0.95; }
    100% { left: calc(100vw + 220px); opacity: 0; transform: translateY(0) rotate(-3deg); }
}

@keyframes ufo-fly-rtl {
    0%   { left: calc(100vw + 220px); opacity: 0; transform: translateY(0) rotate(3deg) scaleX(-1); }
    8%   { opacity: 0.95; }
    25%  { transform: translateY(14px) rotate(-2deg) scaleX(-1); }
    50%  { transform: translateY(-10px) rotate(2deg) scaleX(-1); }
    75%  { transform: translateY(12px) rotate(-3deg) scaleX(-1); }
    92%  { opacity: 0.95; }
    100% { left: -220px; opacity: 0; transform: translateY(0) rotate(3deg) scaleX(-1); }
}

.ufo-light {
    animation: ufo-blink 1s steps(2, start) infinite;
}

.ufo-light:nth-child(odd) {
    animation-delay: 0.3s;
}

@keyframes ufo-blink {
    50% { opacity: 0.2; }
}

/* ── Ringed Planets ── */
.planet {
    position: fixed;
    z-index: 0;
    pointer-events: none;
    animation: planet-float 13s ease-in-out infinite;
}

.planet-a {
    top: -70px;
    right: -70px;
    width: 260px;
    opacity: 0.55;
    filter: drop-shadow(0 0 26px rgba(123, 104, 238, 0.35));
    animation-duration: 14s;
}

.planet-b {
    bottom: -50px;
    left: -50px;
    width: 170px;
    opacity: 0.5;
    filter: drop-shadow(0 0 20px rgba(255, 215, 0, 0.3));
    animation-duration: 11s;
    animation-delay: -4s;
}

@keyframes planet-float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-18px); }
}

.planet-a .planet-ring {
    transform-origin: 100px 100px;
    animation: planet-ring-spin-a 70s linear infinite;
}

.planet-b .planet-ring {
    transform-origin: 70px 70px;
    animation: planet-ring-spin-b 55s linear infinite;
}

@keyframes planet-ring-spin-a {
    from { transform: rotate(-18deg); }
    to { transform: rotate(342deg); }
}

@keyframes planet-ring-spin-b {
    from { transform: rotate(14deg); }
    to { transform: rotate(374deg); }
}

@media (max-width: 768px) {
    .planet-a {
        width: 170px;
    }

    .planet-b {
        width: 120px;
    }
}

/* ── Reduced Motion ── */
@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .hero h1 {
        animation: none;
    }

    #cosmic-canvas {
        display: none;
    }

    .ufo {
        display: none;
    }

    .planet,
    .planet-ring {
        animation: none;
    }
}