/* ==================== IMPORTS & DESIGN TOKENS ==================== */
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;500;600;700;800;900&family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --font-heading: 'Orbitron', sans-serif;
    --font-body: 'Inter', sans-serif;

    --bg-deep: #020010;
    --bg-dark: #0a0a1e;
    --bg-card: rgba(12, 12, 40, 0.65);

    --accent-cyan: #00d4ff;
    --accent-purple: #7b2ff7;
    --accent-pink: #ff006e;
    --accent-gold: #ffd700;

    --glass-bg: rgba(15, 15, 50, 0.55);
    --glass-border: rgba(100, 200, 255, 0.18);
    --glass-blur: 18px;

    --glow-cyan: 0 0 20px rgba(0, 212, 255, 0.5);
    --glow-purple: 0 0 20px rgba(123, 47, 247, 0.5);

    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;

    --transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ==================== GLOBAL RESET ==================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--bg-deep);
    color: #ffffff;
    overflow-x: hidden;
    line-height: 1.6;
}

/* ==================== LOADING SCREEN ==================== */
.loading-screen {
    position: fixed;
    inset: 0;
    background: var(--bg-deep);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 99999;
    transition: opacity 0.8s ease, visibility 0.8s ease;
    overflow: hidden;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

/* Rocket */
.rocket-wrapper {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    animation: rocket-fly 1.5s ease-in-out infinite;
}

.rocket {
    font-size: 5rem;
    transform: rotate(-45deg);
    filter: drop-shadow(0 0 20px rgba(0, 212, 255, 0.6));
    animation: rocket-shake 0.15s ease-in-out infinite alternate;
}

/* Exhaust flames */
.rocket-exhaust {
    display: flex;
    gap: 4px;
    margin-top: -10px;
    margin-left: 30px;
}

.flame {
    display: block;
    border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
    animation: flame-flicker 0.3s ease-in-out infinite alternate;
}

.flame-1 {
    width: 12px;
    height: 30px;
    background: linear-gradient(to bottom, #ffd700, #ff6b00, #ff006e);
    animation-delay: 0s;
}

.flame-2 {
    width: 16px;
    height: 45px;
    background: linear-gradient(to bottom, #ffffff, #ffd700, #ff6b00, #ff006e);
    animation-delay: 0.1s;
}

.flame-3 {
    width: 12px;
    height: 30px;
    background: linear-gradient(to bottom, #ffd700, #ff6b00, #ff006e);
    animation-delay: 0.2s;
}

/* Star particles streaking past */
.loading-stars {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.star-particle {
    position: absolute;
    width: 3px;
    height: 3px;
    background: #ffffff;
    border-radius: 50%;
    box-shadow: 0 0 6px rgba(255, 255, 255, 0.8);
    animation: star-streak 0.8s linear infinite;
}

.star-particle:nth-child(1) { left: 15%; top: -5%; animation-delay: 0s; animation-duration: 0.7s; }
.star-particle:nth-child(2) { left: 35%; top: -5%; animation-delay: 0.2s; animation-duration: 0.9s; }
.star-particle:nth-child(3) { left: 55%; top: -5%; animation-delay: 0.4s; animation-duration: 0.6s; }
.star-particle:nth-child(4) { left: 75%; top: -5%; animation-delay: 0.1s; animation-duration: 0.8s; }
.star-particle:nth-child(5) { left: 25%; top: -5%; animation-delay: 0.5s; animation-duration: 1s; }
.star-particle:nth-child(6) { left: 65%; top: -5%; animation-delay: 0.3s; animation-duration: 0.75s; }

.loading-text {
    font-family: var(--font-heading);
    color: var(--accent-cyan);
    margin-top: 40px;
    font-size: 0.9rem;
    letter-spacing: 4px;
    text-transform: uppercase;
    animation: pulse-text 1.5s ease-in-out infinite;
    z-index: 2;
}

@keyframes rocket-fly {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

@keyframes rocket-shake {
    0% { transform: rotate(-45deg) translateX(-1px); }
    100% { transform: rotate(-45deg) translateX(1px); }
}

@keyframes flame-flicker {
    0% { transform: scaleY(0.8) scaleX(0.9); opacity: 0.8; }
    100% { transform: scaleY(1.2) scaleX(1.1); opacity: 1; }
}

@keyframes star-streak {
    0% { transform: translateY(-10px); opacity: 0; }
    20% { opacity: 1; }
    100% { transform: translateY(105vh); opacity: 0; }
}

@keyframes pulse-text {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

/* ==================== STARFIELD CANVAS ==================== */
#starfield {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* ==================== NAVBAR ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    z-index: 1000;
    border-bottom: 1px solid var(--glass-border);
    box-shadow: 0 4px 30px rgba(0, 150, 255, 0.15);
    transition: background var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
    background: rgba(5, 5, 25, 0.92);
    box-shadow: 0 4px 40px rgba(0, 150, 255, 0.25);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 14px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 1px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 4px;
    flex-wrap: wrap;
    align-items: center;
}

.nav-menu a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    font-size: 0.82rem;
    font-weight: 500;
    position: relative;
    letter-spacing: 0.3px;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
    transition: all var(--transition);
    transform: translateX(-50%);
    border-radius: 2px;
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 70%;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--accent-cyan);
    background: rgba(0, 212, 255, 0.08);
    transform: translateY(-1px);
}

/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
    background: none;
    border: none;
}

.hamburger span {
    width: 26px;
    height: 2.5px;
    background: var(--accent-cyan);
    border-radius: 4px;
    transition: all 0.3s ease;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ==================== HOMEPAGE HERO ==================== */
.galaxy-container {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    padding: 100px 20px 60px;
    background: radial-gradient(ellipse at center, rgba(20, 20, 60, 0.4) 0%, transparent 70%);
    z-index: 1;
    gap: 20px;
}

.welcome-text {
    position: relative;
    text-align: center;
    z-index: 5;
    width: 90%;
    max-width: 800px;
    animation: fadeSlideDown 1s ease 0.5s both;
    flex-shrink: 0;
}

.welcome-text h1 {
    font-family: var(--font-heading);
    font-size: 2.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple), var(--accent-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: gradient-shift 4s ease infinite;
    margin-bottom: 14px;
    line-height: 1.25;
    letter-spacing: 0.5px;
}

.welcome-text p {
    font-size: 1.15rem;
    color: rgba(0, 212, 255, 0.85);
    font-weight: 300;
    letter-spacing: 3px;
    line-height: 1.6;
    text-transform: uppercase;
}

.welcome-text .scroll-hint {
    display: inline-block;
    margin-top: 20px;
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.4);
    letter-spacing: 3px;
    text-transform: uppercase;
    animation: bounce-hint 2s ease-in-out infinite;
}

.welcome-text .scroll-hint::after {
    content: '↓';
    display: block;
    margin-top: 6px;
    font-size: 1.2rem;
}

@keyframes bounce-hint {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(8px); }
}

@keyframes gradient-shift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

@keyframes fadeSlideDown {
    from { opacity: 0; transform: translateY(-30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==================== SOLAR SYSTEM ==================== */
.solar-system-circular {
    position: relative;
    width: 900px;
    height: 900px;
    max-width: 90vw;
    max-height: 90vw;
    margin: 0 auto;
    animation: fadeIn 1.2s ease 0.8s both;
}

/* SUN */
.sun-center-new {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 180px;
    height: 180px;
    cursor: pointer;
    z-index: 30;
    transition: all var(--transition);
}

.sun-center-new:hover {
    transform: translate(-50%, -50%) scale(1.15);
    z-index: 100;
}

.sun-center-new img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    filter: drop-shadow(0 0 30px rgba(255, 200, 0, 0.8));
}

.sun-glow-new {
    position: absolute;
    width: 260px;
    height: 260px;
    top: -40px;
    left: -40px;
    background: radial-gradient(circle, rgba(255, 200, 0, 0.6), rgba(255, 150, 0, 0.3), transparent);
    animation: pulse-sun 2.5s infinite ease-in-out;
    border-radius: 50%;
    filter: blur(25px);
    pointer-events: none;
}

@keyframes pulse-sun {
    50% { transform: scale(1.15); opacity: 1; }
}

/* ORBIT RINGS */
.orbit-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    border: 2px solid rgba(0, 212, 255, 0.15);
    border-radius: 50%;
    box-shadow:
        0 0 15px rgba(0, 212, 255, 0.2),
        inset 0 0 15px rgba(0, 212, 255, 0.15);
    pointer-events: none;
}

.orbit-ring-inner {
    width: 380px;
    height: 380px;
    animation: rotate-orbit-clockwise 35s linear infinite;
}

.orbit-ring-outer {
    width: 620px;
    height: 620px;
    border-color: rgba(123, 47, 247, 0.15);
    box-shadow:
        0 0 15px rgba(123, 47, 247, 0.2),
        inset 0 0 15px rgba(123, 47, 247, 0.15);
    animation: rotate-orbit-counter 45s linear infinite;
}

@keyframes rotate-orbit-clockwise {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes rotate-orbit-counter {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(-360deg); }
}

/* PLANET CIRCLES */
.planet-circle {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
}

.planet-circle-inner { width: 380px; height: 380px; }
.planet-circle-outer { width: 620px; height: 620px; }

/* PLANETS */
.planet-item {
    position: absolute;
    cursor: pointer;
    transition: all var(--transition);
    pointer-events: auto;
    z-index: 15;
}

.planet-item:hover {
    transform: scale(1.3);
    z-index: 100;
}

.planet-small { width: 70px; height: 70px; }
.planet-medium { width: 85px; height: 85px; }
.planet-large { width: 105px; height: 105px; }

.planet-item img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    filter: drop-shadow(0 0 18px rgba(0, 212, 255, 0.7));
    animation: rotate-self 18s linear infinite;
    transition: filter var(--transition);
}

.planet-item:hover img {
    filter: drop-shadow(0 0 35px rgba(0, 212, 255, 1)) brightness(1.3);
}

@keyframes rotate-self {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Planet Positions */
.planet-pos-1 { top: 0; left: 50%; transform: translate(-50%, -50%); }
.planet-pos-1:hover { transform: translate(-50%, -50%) scale(1.3); }

.planet-pos-2 { top: 50%; right: 0; transform: translate(50%, -50%); }
.planet-pos-2:hover { transform: translate(50%, -50%) scale(1.3); }

.planet-pos-3 { bottom: 0; left: 50%; transform: translate(-50%, 50%); }
.planet-pos-3:hover { transform: translate(-50%, 50%) scale(1.3); }

.planet-pos-4 { top: 50%; left: 0; transform: translate(-50%, -50%); }
.planet-pos-4:hover { transform: translate(-50%, -50%) scale(1.3); }

/* SPECIAL OBJECTS */
.special-object {
    position: absolute;
    width: 95px;
    height: 95px;
    cursor: pointer;
    transition: all var(--transition);
    z-index: 10;
}

.special-object:hover { transform: scale(1.25); z-index: 100; }

.special-object img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    filter: drop-shadow(0 0 22px rgba(255, 255, 255, 0.6));
    animation: rotate-self-slow 25s linear infinite;
    transition: filter var(--transition);
}

.special-object:hover img {
    filter: drop-shadow(0 0 40px rgba(255, 255, 255, 1)) brightness(1.3);
}

@keyframes rotate-self-slow {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.special-topleft { top: 50px; left: 50px; }
.special-topright { top: 50px; right: 50px; }
.special-bottomleft { bottom: 50px; left: 50px; }
.special-bottomright { bottom: 50px; right: 50px; }

.comet-tail-new {
    position: absolute;
    width: 90px;
    height: 4px;
    background: linear-gradient(90deg, rgba(255, 215, 0, 0.9), transparent);
    top: 50%;
    right: 100%;
    transform: translateY(-50%) rotate(-35deg);
    filter: blur(2px);
    pointer-events: none;
    box-shadow: 0 0 10px rgba(255, 215, 0, 0.8);
}

/* Labels */
.planet-item .label,
.sun-center-new .label,
.special-object .label {
    position: absolute;
    bottom: -32px;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--font-heading);
    font-size: 0.7rem;
    color: var(--accent-cyan);
    white-space: nowrap;
    text-shadow: 0 0 12px rgba(0, 212, 255, 0.9);
    font-weight: 600;
    pointer-events: none;
    z-index: 100;
    letter-spacing: 1px;
    transition: all var(--transition);
}

.planet-item:hover .label,
.sun-center-new:hover .label,
.special-object:hover .label {
    color: #ffffff;
    text-shadow: 0 0 25px rgba(0, 212, 255, 1), 0 0 40px rgba(0, 212, 255, 0.7);
    transform: translateX(-50%) scale(1.1);
}

/* ==================== SECTIONS (shared) ==================== */
.section {
    position: relative;
    z-index: 1;
    padding: 100px 20px;
    max-width: 1300px;
    margin: 0 auto;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.3;
    letter-spacing: 0.5px;
}

.section-subtitle {
    text-align: center;
    color: rgba(255, 255, 255, 0.55);
    font-size: 1.05rem;
    margin-bottom: 60px;
    font-weight: 300;
    letter-spacing: 1.5px;
    line-height: 1.7;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Scroll-triggered animations */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ==================== EXPLORE SECTION ==================== */
.explore-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 24px;
}

.explore-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 30px 22px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: relative;
    overflow: hidden;
    text-decoration: none;
    color: white;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.explore-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.05), rgba(123, 47, 247, 0.05));
    opacity: 0;
    transition: opacity var(--transition);
    border-radius: var(--radius-lg);
}

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

.explore-card:hover {
    transform: translateY(-8px);
    border-color: rgba(0, 212, 255, 0.4);
    box-shadow: 0 12px 40px rgba(0, 212, 255, 0.15);
}

.explore-card img {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 18px;
    filter: drop-shadow(0 0 15px rgba(0, 212, 255, 0.5));
    transition: all var(--transition);
    animation: rotate-self 20s linear infinite;
}

.explore-card:hover img {
    filter: drop-shadow(0 0 25px rgba(0, 212, 255, 0.9)) brightness(1.2);
    transform: scale(1.1);
}

.explore-card h3 {
    font-family: var(--font-heading);
    font-size: 1rem;
    color: var(--accent-cyan);
    margin-bottom: 10px;
    letter-spacing: 1.2px;
    line-height: 1.3;
}

.explore-card p {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.55);
    line-height: 1.65;
    max-width: 220px;
    text-align: center;
}

/* ==================== QUIZ SECTION ==================== */
.quiz-container {
    max-width: 700px;
    margin: 0 auto;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: 50px 40px;
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
}

.quiz-progress {
    display: flex;
    gap: 6px;
    margin-bottom: 30px;
    justify-content: center;
}

.quiz-progress .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    transition: all var(--transition);
}

.quiz-progress .dot.active {
    background: var(--accent-cyan);
    box-shadow: 0 0 10px rgba(0, 212, 255, 0.6);
}

.quiz-progress .dot.correct { background: #00e676; box-shadow: 0 0 10px rgba(0, 230, 118, 0.6); }
.quiz-progress .dot.wrong { background: var(--accent-pink); box-shadow: 0 0 10px rgba(255, 0, 110, 0.6); }

.quiz-question {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    text-align: center;
    margin-bottom: 30px;
    color: rgba(255, 255, 255, 0.95);
    line-height: 1.6;
    letter-spacing: 0.5px;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.quiz-option {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.95rem;
    cursor: pointer;
    transition: all var(--transition);
    text-align: left;
}

.quiz-option:hover {
    background: rgba(0, 212, 255, 0.08);
    border-color: rgba(0, 212, 255, 0.3);
    transform: translateX(6px);
}

.quiz-option.selected {
    background: rgba(0, 212, 255, 0.12);
    border-color: var(--accent-cyan);
    color: white;
}

.quiz-option.correct-answer {
    background: rgba(0, 230, 118, 0.15);
    border-color: #00e676;
    color: #00e676;
}

.quiz-option.wrong-answer {
    background: rgba(255, 0, 110, 0.15);
    border-color: var(--accent-pink);
    color: var(--accent-pink);
}

.quiz-option.disabled { pointer-events: none; }

.quiz-btn {
    display: block;
    margin: 30px auto 0;
    padding: 14px 40px;
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    border: none;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    color: white;
    cursor: pointer;
    transition: all var(--transition);
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
}

.quiz-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 212, 255, 0.5);
}

.quiz-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.quiz-result {
    text-align: center;
    padding: 30px;
}

.quiz-result .score {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
}

.quiz-result .score-text {
    color: rgba(255, 255, 255, 0.7);
    font-size: 1.1rem;
    margin-bottom: 30px;
}

/* ==================== ABOUT SECTION ==================== */
.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.about-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 40px 28px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    text-align: center;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.about-card:hover {
    transform: translateY(-6px);
    border-color: rgba(0, 212, 255, 0.35);
    box-shadow: 0 10px 35px rgba(0, 212, 255, 0.12);
}

.about-card .icon {
    font-size: 2.5rem;
    margin-bottom: 18px;
    display: block;
}

.about-card h3 {
    font-family: var(--font-heading);
    font-size: 1rem;
    color: var(--accent-cyan);
    margin-bottom: 12px;
    letter-spacing: 1.2px;
    line-height: 1.3;
}

.about-card p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
    line-height: 1.75;
    max-width: 280px;
    text-align: center;
}

/* ==================== CONTACT FORM ==================== */
.contact-container {
    max-width: 750px;
    margin: 0 auto;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: 50px 40px;
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    position: relative;
    overflow: hidden;
}

.contact-container::before {
    content: '';
    position: absolute;
    top: -60%;
    right: -30%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.08), transparent 70%);
    pointer-events: none;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    margin-bottom: 22px;
}

.form-group label {
    display: block;
    font-family: var(--font-heading);
    font-size: 0.75rem;
    color: var(--accent-cyan);
    letter-spacing: 1.5px;
    text-transform: uppercase;
    margin-bottom: 8px;
    font-weight: 600;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: #ffffff;
    font-family: var(--font-body);
    font-size: 0.95rem;
    transition: all var(--transition);
    outline: none;
    line-height: 1.5;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(255, 255, 255, 0.3);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent-cyan);
    background: rgba(0, 212, 255, 0.06);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-submit-btn {
    display: block;
    width: 100%;
    padding: 16px;
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    border: none;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    color: white;
    cursor: pointer;
    transition: all var(--transition);
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
    margin-top: 8px;
}

.form-submit-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 212, 255, 0.5);
}

.form-submit-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.form-success {
    text-align: center;
    padding: 40px 20px;
    animation: fadeIn 0.5s ease;
}

.form-success .success-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 16px;
}

.form-success h3 {
    font-family: var(--font-heading);
    color: var(--accent-cyan);
    font-size: 1.4rem;
    margin-bottom: 10px;
    letter-spacing: 1px;
}

.form-success p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 1rem;
    line-height: 1.6;
}

/* ==================== QUIZ SCORE FORM ==================== */
.quiz-save-form {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid rgba(0, 212, 255, 0.15);
}

.quiz-save-form label {
    display: block;
    font-family: var(--font-heading);
    font-size: 0.7rem;
    color: var(--accent-cyan);
    letter-spacing: 1.5px;
    text-transform: uppercase;
    margin-bottom: 8px;
    text-align: center;
    font-weight: 600;
}

.quiz-save-form .save-row {
    display: flex;
    gap: 10px;
    margin-bottom: 16px;
}

.quiz-save-form input {
    flex: 1;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: #ffffff;
    font-family: var(--font-body);
    font-size: 0.9rem;
    outline: none;
    transition: all var(--transition);
}

.quiz-save-form input::placeholder {
    color: rgba(255, 255, 255, 0.3);
}

.quiz-save-form input:focus {
    border-color: var(--accent-cyan);
    background: rgba(0, 212, 255, 0.06);
}

.quiz-save-btn {
    padding: 12px 24px;
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    border: 1px solid rgba(0, 212, 255, 0.4);
    border-radius: var(--radius-md);
    background: rgba(0, 212, 255, 0.1);
    color: var(--accent-cyan);
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}

.quiz-save-btn:hover {
    background: rgba(0, 212, 255, 0.2);
    border-color: var(--accent-cyan);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 212, 255, 0.2);
}

.quiz-save-success {
    text-align: center;
    color: #00e676;
    font-size: 0.85rem;
    font-weight: 500;
    margin-top: 8px;
    animation: fadeIn 0.4s ease;
}

/* Leaderboard */
.quiz-leaderboard {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid rgba(123, 47, 247, 0.15);
}

.quiz-leaderboard h4 {
    font-family: var(--font-heading);
    font-size: 0.8rem;
    color: var(--accent-purple);
    letter-spacing: 1.5px;
    text-transform: uppercase;
    text-align: center;
    margin-bottom: 14px;
}

.leaderboard-list {
    list-style: none;
    padding: 0;
}

.leaderboard-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    margin: 4px 0;
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    transition: background var(--transition);
}

.leaderboard-list li:hover {
    background: rgba(0, 212, 255, 0.06);
}

.leaderboard-list .lb-rank {
    color: var(--accent-gold);
    font-weight: 700;
    font-family: var(--font-heading);
    font-size: 0.75rem;
    min-width: 28px;
}

.leaderboard-list .lb-name {
    flex: 1;
    color: rgba(255, 255, 255, 0.85);
    margin-left: 10px;
}

.leaderboard-list .lb-score {
    color: var(--accent-cyan);
    font-weight: 600;
    font-family: var(--font-heading);
    font-size: 0.8rem;
}

.leaderboard-empty {
    text-align: center;
    color: rgba(255, 255, 255, 0.35);
    font-size: 0.85rem;
    font-style: italic;
    padding: 10px;
}

/* ==================== DETAIL PAGES ==================== */
.detail-page {
    position: relative;
    min-height: 100vh;
    padding: 100px 20px 40px;
    background: radial-gradient(ellipse at center, rgba(20, 20, 60, 0.25) 0%, transparent 70%);
    z-index: 1;
}

.content-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    animation: fadeIn 0.8s ease both;
}

.page-title {
    font-family: var(--font-heading);
    text-align: center;
    font-size: 3rem;
    margin-bottom: 50px;
    position: relative;
    z-index: 10;
}

.glow-text {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: glow-pulse 2s infinite ease-in-out;
}

@keyframes glow-pulse {
    0%, 100% { filter: drop-shadow(0 0 20px rgba(0, 212, 255, 0.6)); }
    50% { filter: drop-shadow(0 0 40px rgba(0, 212, 255, 1)) drop-shadow(0 0 60px rgba(123, 47, 247, 0.6)); }
}

.detail-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 50px;
    align-items: start;
    background: var(--glass-bg);
    padding: 50px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    box-shadow: 0 10px 50px rgba(0, 150, 255, 0.1);
    position: relative;
    z-index: 10;
}

.image-section { position: relative; text-align: center; }

.detail-image {
    width: 350px;
    height: 350px;
    object-fit: contain;
    position: relative;
    z-index: 2;
    border-radius: 50%;
}

.image-glow {
    position: absolute;
    width: 400px;
    height: 400px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    filter: blur(40px);
    z-index: 1;
    animation: pulse-glow 3s infinite ease-in-out;
}

@keyframes pulse-glow {
    0%, 100% { opacity: 0.4; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 0.7; transform: translate(-50%, -50%) scale(1.1); }
}

/* Glow effects per planet */
.sun-glow-effect { background: radial-gradient(circle, rgba(255, 200, 0, 0.6), transparent); }
.earth-glow-effect { background: radial-gradient(circle, rgba(0, 150, 255, 0.6), transparent); }
.moon-glow-effect { background: radial-gradient(circle, rgba(200, 200, 220, 0.6), transparent); }
.saturn-glow-effect { background: radial-gradient(circle, rgba(255, 215, 0, 0.6), transparent); }
.mercury-glow-effect { background: radial-gradient(circle, rgba(169, 169, 169, 0.6), transparent); }
.venus-glow-effect { background: radial-gradient(circle, rgba(255, 198, 73, 0.6), transparent); }
.mars-glow-effect { background: radial-gradient(circle, rgba(255, 100, 50, 0.6), transparent); }
.jupiter-glow-effect { background: radial-gradient(circle, rgba(255, 180, 120, 0.6), transparent); }
.uranus-glow-effect { background: radial-gradient(circle, rgba(79, 208, 231, 0.6), transparent); }
.neptune-glow-effect { background: radial-gradient(circle, rgba(73, 115, 255, 0.6), transparent); }
.blackhole-glow-effect { background: radial-gradient(circle, rgba(138, 43, 226, 0.7), transparent); }
.milkyway-glow-effect { background: radial-gradient(circle, rgba(255, 255, 255, 0.4), transparent); }
.comet-glow-effect { background: radial-gradient(circle, rgba(255, 215, 0, 0.6), transparent); }

.pulsing { animation: pulse-animation 3s ease-in-out infinite; }

@keyframes pulse-animation {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.info-section h2 {
    font-family: var(--font-heading);
    color: var(--accent-cyan);
    font-size: 1.8rem;
    margin-bottom: 18px;
    text-shadow: 0 0 15px rgba(0, 212, 255, 0.6);
    letter-spacing: 1px;
    line-height: 1.3;
}

.info-section h3 {
    font-family: var(--font-heading);
    color: var(--accent-purple);
    font-size: 1.2rem;
    margin-top: 30px;
    margin-bottom: 16px;
    text-shadow: 0 0 10px rgba(123, 47, 247, 0.6);
    letter-spacing: 0.5px;
    line-height: 1.3;
}

.intro-text {
    font-size: 1.05rem;
    line-height: 1.9;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 25px;
    text-align: justify;
    text-align-last: left;
}

.facts-list { list-style: none; margin-bottom: 20px; }

.facts-list li {
    padding: 12px 16px;
    margin: 8px 0;
    background: rgba(0, 212, 255, 0.04);
    border-left: 3px solid rgba(0, 212, 255, 0.4);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    font-size: 0.98rem;
}

.facts-list li:hover {
    background: rgba(0, 212, 255, 0.1);
    transform: translateX(8px);
    border-left-color: var(--accent-purple);
}

.facts-list li strong { color: var(--accent-cyan); }

/* Buttons */
.button-group {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    margin-top: 28px;
}

.btn-primary, .btn-learn {
    padding: 12px 28px;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 600;
    transition: all var(--transition);
    text-decoration: none;
    display: inline-block;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    color: #ffffff;
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 212, 255, 0.5);
}

.btn-learn {
    background: rgba(123, 47, 247, 0.12);
    color: var(--accent-purple);
    border: 1px solid rgba(123, 47, 247, 0.4);
}

.btn-learn:hover {
    background: rgba(123, 47, 247, 0.25);
    color: #ffffff;
    border-color: var(--accent-cyan);
    transform: translateY(-3px);
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    text-decoration: none;
    color: white;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
    box-shadow: 0 4px 20px rgba(123, 47, 247, 0.3);
    transition: all var(--transition);
    margin-bottom: 30px;
}

.btn-back:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(123, 47, 247, 0.5);
}

/* ==================== MODAL ==================== */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    position: relative;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    margin: 5% auto;
    padding: 40px;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    width: 85%;
    max-width: 700px;
    animation: slideDown 0.4s ease;
    box-shadow: 0 0 60px rgba(0, 212, 255, 0.2);
}

@keyframes slideDown {
    from { transform: translateY(-80px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.close-modal {
    position: absolute;
    top: 15px;
    right: 25px;
    color: var(--accent-cyan);
    font-size: 36px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    line-height: 1;
}

.close-modal:hover {
    color: var(--accent-pink);
    transform: rotate(90deg);
}

#modalTitle {
    font-family: var(--font-heading);
    color: var(--accent-cyan);
    font-size: 1.6rem;
    margin-bottom: 20px;
    text-shadow: 0 0 15px rgba(0, 212, 255, 0.5);
    letter-spacing: 1px;
}

#modalBody {
    color: rgba(255, 255, 255, 0.85);
    font-size: 1rem;
    line-height: 1.8;
}

#modalBody ul { margin-top: 16px; padding-left: 20px; }

#modalBody li {
    margin: 10px 0;
    padding-left: 10px;
    border-left: 3px solid var(--accent-purple);
}

/* ==================== SCROLL TO TOP ==================== */
.scroll-top-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    border: none;
    color: white;
    font-size: 1.3rem;
    cursor: pointer;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition);
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
}

.scroll-top-btn.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-top-btn:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 212, 255, 0.5);
}

/* ==================== FOOTER ==================== */
.footer {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--glass-border);
    padding: 50px 20px 20px;
    margin-top: 0;
    position: relative;
    z-index: 100;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid rgba(0, 212, 255, 0.1);
    align-items: start;
}

.footer-section h3 {
    font-family: var(--font-heading);
    color: var(--accent-cyan);
    font-size: 1.2rem;
    margin-bottom: 12px;
    letter-spacing: 1px;
    line-height: 1.3;
}

.footer-section h4 {
    font-family: var(--font-heading);
    color: var(--accent-purple);
    font-size: 1rem;
    margin-bottom: 15px;
    letter-spacing: 0.8px;
    line-height: 1.3;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.65);
    line-height: 1.8;
    margin: 8px 0;
    text-align: left;
}

.footer-links { list-style: none; padding: 0; }
.footer-links li { margin: 10px 0; }

.footer-links a,
.footer-section a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    transition: all var(--transition);
    display: inline-block;
    font-size: 0.9rem;
}

.footer-links a:hover,
.footer-section a:hover {
    color: var(--accent-cyan);
    transform: translateX(4px);
}

.social-links {
    display: flex;
    gap: 12px;
    margin-top: 15px;
}

.social-links a {
    padding: 8px 16px;
    background: rgba(0, 212, 255, 0.08);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: var(--radius-sm);
    color: var(--accent-cyan);
    font-size: 0.85rem;
    transition: all var(--transition);
}

.social-links a:hover {
    background: rgba(0, 212, 255, 0.15);
    border-color: var(--accent-cyan);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 212, 255, 0.2);
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 20px;
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.4);
    margin: 5px 0;
    font-size: 0.85rem;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 1024px) {
    .solar-system-circular { width: 650px; height: 650px; }
    .orbit-ring-inner { width: 320px; height: 320px; }
    .orbit-ring-outer { width: 520px; height: 520px; }
    .planet-circle-inner { width: 320px; height: 320px; }
    .planet-circle-outer { width: 520px; height: 520px; }
    .detail-content { grid-template-columns: 1fr; gap: 30px; padding: 30px; }
}

@media (max-width: 768px) {
    .hamburger { display: flex; }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: rgba(5, 5, 25, 0.97);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 80px 30px 30px;
        gap: 6px;
        transition: right 0.4s ease;
        z-index: 1000;
        border-left: 1px solid var(--glass-border);
        overflow-y: auto;
    }

    .nav-menu.open { right: 0; }

    .nav-menu a {
        font-size: 0.9rem;
        padding: 12px 16px;
        width: 100%;
    }

    .welcome-text h1 { font-size: 1.8rem; }
    .welcome-text p { font-size: 0.95rem; }

    .solar-system-circular { width: 450px; height: 450px; }
    .sun-center-new { width: 120px; height: 120px; }
    .orbit-ring-inner { width: 240px; height: 240px; }
    .orbit-ring-outer { width: 380px; height: 380px; }
    .planet-circle-inner { width: 240px; height: 240px; }
    .planet-circle-outer { width: 380px; height: 380px; }
    .planet-small { width: 50px; height: 50px; }
    .planet-medium { width: 60px; height: 60px; }
    .planet-large { width: 75px; height: 75px; }
    .special-object { width: 65px; height: 65px; }

    .special-topleft, .special-topright { top: 20px; }
    .special-bottomleft, .special-bottomright { bottom: 20px; }
    .special-topleft, .special-bottomleft { left: 20px; }
    .special-topright, .special-bottomright { right: 20px; }

    .page-title { font-size: 2.2rem; }
    .detail-image { width: 250px; height: 250px; }
    .button-group { flex-direction: column; }
    .modal-content { padding: 25px; width: 95%; }

    .section { padding: 60px 16px; }
    .section-title { font-size: 1.6rem; }
    .quiz-container { padding: 30px 20px; }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
        text-align: center;
    }

    .footer-links a:hover { transform: translateX(0); }
    .social-links { justify-content: center; }

    .form-row { grid-template-columns: 1fr; gap: 12px; }
    .contact-container { padding: 30px 20px; }
    .quiz-save-form .save-row { flex-direction: column; }
}

@media (max-width: 480px) {
    .solar-system-circular { width: 320px; height: 320px; }
    .sun-center-new { width: 80px; height: 80px; }
    .orbit-ring-inner { width: 180px; height: 180px; }
    .orbit-ring-outer { width: 280px; height: 280px; }
    .planet-circle-inner { width: 180px; height: 180px; }
    .planet-circle-outer { width: 280px; height: 280px; }
    .planet-small { width: 35px; height: 35px; }
    .planet-medium { width: 45px; height: 45px; }
    .planet-large { width: 55px; height: 55px; }
    .special-object { width: 45px; height: 45px; }

    .welcome-text h1 { font-size: 1.4rem; }
    .explore-grid { grid-template-columns: 1fr; }
}