:root {
    --nasa-blue: #0B3D91;
    --nasa-red: #FC3D21;
    --nasa-dark: #0a0a1a;
    --nasa-space: #1a1a2e;
    --nasa-deep: #16213e;
    --nasa-gold: #FFD700;
    --nasa-teal: #00b4d8;
}

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

body {
    background: linear-gradient(135deg, var(--nasa-dark) 0%, var(--nasa-space) 50%, var(--nasa-deep) 100%);
    color: white;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    overflow-x: hidden;
}

/* Navigation */
.navbar {
    background: rgba(10, 10, 26, 0.95) !important;
    backdrop-filter: blur(10px);
    padding: 1rem 0;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(10, 10, 26, 0.98) !important;
    padding: 0.5rem 0;
}

.navbar-brand {
    font-weight: bold;
    font-size: 1.5rem;
    color: var(--nasa-gold) !important;
}

.nav-link {
    color: white !important;
    font-weight: 500;
    margin: 0 0.5rem;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--nasa-teal) !important;
}

/* Hero Section */
.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.earth-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
}

.earth {
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background-image: url('https://www.solarsystemscope.com/textures/download/2k_earth_daymap.jpg');
    background-size: cover;
    background-position: center;
    box-shadow: 
        inset 0 0 50px var(--nasa-blue),
        inset 0 0 100px var(--nasa-dark),
        0 0 100px rgba(0, 180, 216, 0.3);
    position: relative;
    transform-style: preserve-3d;
    animation: earth-rotate 30s linear infinite;
}

@keyframes earth-rotate {
    0% {
        background-position: 0% 50%;
    }
    100% {
        background-position: 100% 50%;
    }
}

.earth::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: 
        radial-gradient(circle at 20% 20%, rgba(255,255,255,0.3) 0%, transparent 50%),
        repeating-linear-gradient(45deg, transparent, transparent 2px, rgba(255,255,255,0.1) 2px, rgba(255,255,255,0.1) 4px);
    animation: cloudMove 20s linear infinite;
}

.hero-content {
    position: relative;
    z-index: 2;
    width: 100%;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: bold;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #fff 0%, var(--nasa-teal) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    color: rgba(255, 255, 255, 0.8);
    max-width: 500px;
}

.hero-buttons {
    margin-top: 2rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--nasa-blue) 0%, var(--nasa-teal) 100%);
    border: none;
    padding: 0.75rem 2rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(11, 61, 145, 0.3);
}

.btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
}

.scroll-arrow {
    width: 30px;
    height: 50px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 15px;
    position: relative;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    width: 4px;
    height: 12px;
    background: var(--nasa-teal);
    border-radius: 2px;
    transform: translateX(-50%);
    animation: scrollBounce 2s infinite;
}

/* Sections */
.section-padding {
    padding: 6rem 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #fff 0%, var(--nasa-teal) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 3rem;
}

.section-text {
    font-size: 1.1rem;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 2rem;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-top: 3rem;
}

.feature-item {
    padding: 2rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--nasa-teal);
}

.feature-icon {
    font-size: 2.5rem;
    color: var(--nasa-teal);
    margin-bottom: 1rem;
}

.feature-item h5 {
    color: white;
    margin-bottom: 1rem;
}

/* About Visual */
.about-visual {
    position: relative;
    height: 400px;
}

.floating-element {
    position: absolute;
    font-size: 3rem;
    color: var(--nasa-teal);
    animation: float 6s ease-in-out infinite;
}

.element-1 {
    top: 20%;
    left: 20%;
    animation-delay: 0s;
}

.element-2 {
    top: 50%;
    left: 60%;
    animation-delay: 2s;
}

.element-3 {
    top: 70%;
    left: 30%;
    animation-delay: 4s;
}

/* Method Steps */
.method-step {
    text-align: center;
    padding: 2rem;
    position: relative;
}

.step-number {
    font-size: 4rem;
    font-weight: bold;
    color: rgba(255, 255, 255, 0.1);
    position: absolute;
    top: -1rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
}

.method-step h4 {
    color: white;
    margin: 1rem 0;
    position: relative;
    z-index: 2;
}

.step-visual {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--nasa-blue) 0%, var(--nasa-teal) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 1rem auto;
    font-size: 2rem;
}

.method-demo {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    padding: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Demo Container */
.demo-container {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    overflow: hidden;
}

/* Team Section */
.team-member {
    margin-bottom: 2rem;
}

.member-card {
    text-align: center;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.member-card:hover {
    transform: translateY(-5px);
    border-color: var(--nasa-teal);
}

.member-avatar {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--nasa-blue) 0%, var(--nasa-teal) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 2.5rem;
}

/* Footer */
.footer {
    background: rgba(0, 0, 0, 0.5);
    padding: 2rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .earth {
        width: 300px;
        height: 300px;
    }
    
    .section-title {
        font-size: 2rem;
    }
}