/* ============================================
   EduSpace – Deep Space Cinematic UI (Google Style)
   ============================================ */

*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-deep: #020306;
    /* Much darker, realistic space black */
    --text-primary: #f8f9fa;
    --text-dim: #9aa0a6;
    /* Google UI secondary text color */

    --font-display: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
}

html,
body {
    width: 100vw;
    height: 100vh;
    margin: 0;
    padding: 0;
    background: var(--bg-deep);
    color: var(--text-primary);
    font-family: var(--font-body);
    overflow: hidden;
    overscroll-behavior: none;
}

a {
    text-decoration: none;
    color: inherit;
    outline: none;
    -webkit-tap-highlight-color: transparent;
}

/* ---- Transition Overlay ---- */
.transition-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: var(--bg-deep);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.8s cubic-bezier(0.25, 1, 0.5, 1);
}

body.navigating .transition-overlay {
    opacity: 1;
    pointer-events: auto;
}

/* ---- Space Viewport (The Camera) ---- */
#space-viewport {
    position: absolute;
    inset: 0;
    transform-origin: center center;
    transition: transform 1.2s cubic-bezier(0.22, 1, 0.36, 1);
    will-change: transform;
}

/* ---- Canvases & Background ---- */
canvas {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

#starfield {
    z-index: 0;
}

#cosmic-dust {
    z-index: 10;
    mix-blend-mode: screen;
    opacity: 0.3;
}

/* Very subtle */

/* Cinematic Ambient Nebula */
.ambient-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(200px);
    opacity: 0.08;
    pointer-events: none;
    mix-blend-mode: screen;
    z-index: 1;
}

.glow-blue {
    width: 1200px;
    height: 1200px;
    background: #2b70c9;
    top: -300px;
    right: -300px;
    animation: breathe 25s infinite alternate;
}

.glow-purple {
    width: 1400px;
    height: 1400px;
    background: #3d1b66;
    bottom: -400px;
    left: -300px;
    animation: breathe 30s infinite alternate-reverse;
}

@keyframes breathe {
    from {
        transform: scale(0.95);
        opacity: 0.05;
    }

    to {
        transform: scale(1.05);
        opacity: 0.12;
    }
}

/* ================================================
   Solar System Container
   ================================================ */
.solar-system {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    z-index: 5;
    will-change: transform;
}

/* ---- Planet Groups ---- */
.planet-group {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    /* Ultra-slow, Google-style calming motion */
    animation: float 45s ease-in-out infinite alternate;
    cursor: pointer;
    z-index: 5;
    transition: z-index 0s, transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.planet-group:hover,
.planet-group:focus-visible {
    z-index: 20;
}

.group-sun {
    cursor: default;
    z-index: 2;
    animation-duration: 60s;
}

.group-earth {
    animation-delay: -15s;
    animation-duration: 22s;
}

.group-saturn {
    animation-delay: -12s;
    animation-duration: 25s;
}

.group-mars {
    animation-delay: -2s;
    animation-duration: 20s;
}

.group-moon {
    animation-delay: -8s;
    animation-duration: 24s;
}

@keyframes float {
    0% {
        margin-top: -8px;
        margin-left: 5px;
    }

    50% {
        margin-top: 5px;
        margin-left: -8px;
    }

    100% {
        margin-top: 8px;
        margin-left: 8px;
    }
}

/* Navigation fade */
body.navigating .planet-group {
    opacity: 0;
    transition: opacity 0.5s !important;
}

body.navigating .planet-group.clicked {
    opacity: 1;
    transition: opacity 0.2s !important;
}

body.navigating #starfield,
body.navigating #cosmic-dust {
    opacity: 0;
    transition: opacity 0.8s;
}

/* ---- Realistic Planets Base ---- */
.planet {
    border-radius: 50%;
    position: relative;
    transform: scale(1);
    transition: transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.6s ease;
    z-index: 2;
    /* Default dark shading for all realistic planets */
    box-shadow: inset -30px -30px 50px rgba(0, 0, 0, 0.95), inset 10px 10px 30px rgba(255, 255, 255, 0.1);
}

.planet-group:hover .planet:not(.sun) {
    transform: scale(1.15);
}

/* Atmospheric Rim Lighting */
.atmosphere {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    /* Cinematic rim light on the top left, deep shadow on bottom right */
    box-shadow: inset -40px -40px 60px rgba(0, 0, 0, 0.98), inset 15px 15px 40px rgba(255, 255, 255, 0.3);
    pointer-events: none;
    mix-blend-mode: soft-light;
}

/* Titles - Clean Google UI Style */
.planet-title {
    position: absolute;
    bottom: -70px;
    text-align: center;
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
    pointer-events: none;
    background: rgba(0, 0, 0, 0.6);
    padding: 8px 16px;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.planet-group:hover .planet-title:not(.sun-title) {
    opacity: 1;
    transform: translateY(0);
}

.planet-title h2 {
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    color: #fff;
    margin-bottom: 2px;
}

.planet-title p {
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 400;
    color: var(--text-dim);
    letter-spacing: 0.5px;
}

.group-sun .planet-title {
    position: absolute;
    bottom: -70px;
    opacity: 1;
    transform: none;
    background: transparent;
    backdrop-filter: none;
    border: none;
}

.group-sun .planet-title h2 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    margin-bottom: 4px;
    color: #e8eaed;
}


/* ================================================
   Cinematic Planet Materials
   ================================================ */

/* --- SUN --- (Central AI Dashboard) */
.sun {
    width: 140px;
    height: 140px;
    background: #ffffff;
    /* Soft, elegant volumetric glow rather than an intense flare */
    box-shadow:
        0 0 80px 10px rgba(255, 240, 200, 0.4),
        0 0 160px 30px rgba(255, 200, 100, 0.1),
        0 0 300px 80px rgba(255, 120, 0, 0.05);
    animation: sunPulsate 18s ease-in-out infinite alternate;
}

@keyframes sunPulsate {
    from {
        box-shadow: 0 0 60px 8px rgba(255, 240, 200, 0.3), 0 0 120px 25px rgba(255, 200, 100, 0.08), 0 0 250px 70px rgba(255, 120, 0, 0.03);
    }

    to {
        box-shadow: 0 0 90px 12px rgba(255, 240, 200, 0.5), 0 0 180px 35px rgba(255, 200, 100, 0.15), 0 0 320px 90px rgba(255, 120, 0, 0.08);
    }
}

/* --- EARTH (Vault) --- (Deep ocean blues, realistic terminator line) */
.earth {
    width: 100px;
    height: 100px;
    background: radial-gradient(circle at 30% 30%, #20627a 0%, #15456b 40%, #06182c 90%);
    overflow: hidden;
}

.earth::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background-image:
        radial-gradient(ellipse at 60% 30%, rgba(255, 255, 255, 0.6) 5%, transparent 40%),
        radial-gradient(ellipse at 25% 65%, rgba(255, 255, 255, 0.4) 10%, transparent 45%);
    mix-blend-mode: overlay;
    opacity: 0.6;
    transform: rotate(15deg);
}

.group-earth:hover .planet {
    /* Extreme soft drop shadow for elevation, NOT a neon glow */
    box-shadow: inset -30px -30px 50px rgba(0, 0, 0, 0.95), inset 10px 10px 30px rgba(200, 230, 255, 0.3), 0 20px 60px rgba(0, 0, 0, 0.8), 0 0 80px rgba(32, 98, 122, 0.3);
}


/* --- SATURN (Playlist) --- (Subtle gaseous bands, delicate rings) */
.group-saturn {
    margin-top: 20px;
}

.saturn {
    width: 110px;
    height: 110px;
    background: radial-gradient(circle at 35% 35%, #d1baa3 0%, #9e8770 50%, #473a2f 90%);
}

.saturn::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: repeating-linear-gradient(to bottom, transparent, transparent 8px, rgba(0, 0, 0, 0.06) 8px, rgba(0, 0, 0, 0.06) 12px);
    transform: rotate(-15deg);
    mix-blend-mode: multiply;
    opacity: 0.5;
}

.saturn-rings {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 260px;
    height: 260px;
    border-radius: 50%;
    transform: translate(-50%, -50%) rotateX(76deg) rotateY(-15deg);
    border: 18px solid rgba(209, 186, 163, 0.4);
    border-top-color: rgba(209, 186, 163, 0.05);
    /* Fade out back half for 3D */
    box-shadow:
        0 4px 10px rgba(0, 0, 0, 0.5), inset 0 2px 10px rgba(0, 0, 0, 0.5),
        0 0 15px rgba(209, 186, 163, 0.1), inset 0 0 15px rgba(209, 186, 163, 0.1);
    pointer-events: none;
    z-index: -1;
    transition: transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.group-saturn:hover .saturn-rings {
    transform: translate(-50%, -50%) rotateX(72deg) rotateY(-10deg) scale(1.05);
    border-color: rgba(209, 186, 163, 0.6);
    border-top-color: rgba(209, 186, 163, 0.1);
}

.group-saturn:hover .planet {
    box-shadow: inset -30px -30px 50px rgba(0, 0, 0, 0.95), inset 10px 10px 30px rgba(255, 230, 200, 0.2), 0 20px 60px rgba(0, 0, 0, 0.8), 0 0 80px rgba(209, 186, 163, 0.2);
}


/* --- MARS (Code Station) --- (Darker terra cotta, sharp shadows) */
.mars {
    width: 75px;
    height: 75px;
    background: radial-gradient(circle at 30% 30%, #a8513d 0%, #6e2e20 50%, #1f0b06 90%);
}

.mars::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background-image:
        radial-gradient(circle at 35% 55%, rgba(0, 0, 0, 0.4) 15%, transparent 35%),
        radial-gradient(circle at 65% 35%, rgba(0, 0, 0, 0.3) 10%, transparent 25%);
    mix-blend-mode: multiply;
    opacity: 0.8;
}

.group-mars:hover .planet {
    box-shadow: inset -30px -30px 50px rgba(0, 0, 0, 0.95), inset 10px 10px 30px rgba(255, 180, 150, 0.2), 0 20px 60px rgba(0, 0, 0, 0.8), 0 0 80px rgba(168, 81, 61, 0.2);
}


/* --- MOON (Share Hub) --- (Desaturated, stark cinematic contrast) */
.moon {
    width: 60px;
    height: 60px;
    background: radial-gradient(circle at 25% 25%, #d1d5db 0%, #6b7280 40%, #111827 85%);
}

.moon::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background-image:
        radial-gradient(circle at 25% 65%, rgba(0, 0, 0, 0.5) 15%, transparent 35%),
        radial-gradient(circle at 55% 35%, rgba(0, 0, 0, 0.4) 10%, transparent 30%),
        radial-gradient(circle at 80% 75%, rgba(0, 0, 0, 0.4) 12%, transparent 25%);
    mix-blend-mode: multiply;
    opacity: 0.7;
}

.group-moon:hover .planet {
    box-shadow: inset -30px -30px 50px rgba(0, 0, 0, 0.95), inset 10px 10px 30px rgba(255, 255, 255, 0.2), 0 20px 60px rgba(0, 0, 0, 0.8), 0 0 80px rgba(209, 213, 219, 0.15);
}


/* ================================================
   Responsive Adjustments
   ================================================ */
@media (max-width: 900px) {
    .solar-system {
        transform: translate(-50%, -50%) scale(0.65);
    }
}

@media (max-width: 600px) {
    .solar-system {
        transform: translate(-50%, -50%) scale(0.4);
    }

    .group-earth {
        transform: translate(-280px, -200px) !important;
    }

    .group-saturn {
        transform: translate(320px, -220px) !important;
    }

    .group-mars {
        transform: translate(220px, 320px) !important;
    }

    .group-moon {
        transform: translate(-220px, 300px) !important;
    }

    .group-sun .planet-title {
        bottom: -70px;
    }
}