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

:root {
    --primary-color: #0a0a0a;
    --secondary-color: #1a1a1a;
    --accent-color: #2a2a2a;
    --highlight-color: #cccccc;
    --text-color: #e8e8e8;
    --light-text: #999999;
    --card-bg: #141414;
    --border-color: #2a2a2a;
    --success-color: #ffffff;
    --blue-accent: #00d4ff;
}

/* Light mode theme */
:root[data-theme="light"] {
    --primary-color: #f5f5f5; /* smoke white */
    --secondary-color: #f5f5f5; /* smoke white */
    --accent-color: #505050; /* semi-dark gray */
    --highlight-color: #303030; /* dark gray */
    --text-color: #303030; /* dark gray for text */
    --light-text: #505050; /* semi-dark gray for secondary text */
    --card-bg: #ffffff; /* white for cards */
    --border-color: #505050; /* semi-dark gray for borders */
    --success-color: #303030; /* dark gray for headings */
    --blue-accent: #0099cc; /* slightly darker blue for light mode */
}

body {
    font-family: 'Space Grotesk', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--secondary-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: var(--primary-color);
    padding: 60px 0;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

header h1 {
    font-size: 3.5rem;
    margin-bottom: 10px;
    color: var(--success-color);
    letter-spacing: 8px;
    font-weight: 700;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--light-text);
    font-weight: 300;
    letter-spacing: 2px;
}

/* Navigation */
nav {
    background-color: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
}

:root[data-theme="light"] nav {
    background-color: rgba(245, 245, 245, 0.95);
}

nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

nav ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    padding: 0;
    gap: 8px;
    margin: 0;
}

nav li {
    margin: 0;
}

nav a {
    color: var(--light-text);
    text-decoration: none;
    padding: 20px 16px;
    transition: all 0.2s ease;
    display: block;
    font-weight: 400;
    font-size: 0.85rem;
    letter-spacing: 0.3px;
    position: relative;
    text-transform: uppercase;
    white-space: nowrap;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--success-color);
    transition: width 0.2s ease;
}

nav a:hover {
    color: var(--success-color);
}

nav a:hover::after {
    width: 60%;
}

nav a.active {
    color: var(--success-color);
}

nav a.active::after {
    width: 60%;
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: 2px solid var(--border-color);
    border-radius: 50px;
    padding: 8px 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-color);
    font-size: 1rem;
    transition: all 0.3s ease;
    white-space: nowrap;
    flex-shrink: 0;
}

.theme-toggle:hover {
    border-color: var(--success-color);
    transform: scale(1.05);
}

.theme-toggle i {
    font-size: 1.1rem;
    transition: transform 0.3s ease;
}

.theme-toggle:hover i {
    transform: rotate(20deg);
}

/* Main Content */
main {
    padding: 40px 20px;
}

.section {
    background-color: var(--card-bg);
    margin-bottom: 30px;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--border-color);
}

.section h2 {
    color: var(--success-color);
    margin-bottom: 25px;
    font-size: 2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

.section h2 i {
    color: var(--blue-accent);
    margin-right: 12px;
}

.icon-blue {
    color: var(--blue-accent);
}

.countdown-card h3 i {
    color: var(--blue-accent);
    margin-right: 8px;
}

.section h3 {
    color: var(--text-color);
    margin: 20px 0 15px;
    font-size: 1.4rem;
}

/* Highlight Box */
.highlight-box {
    background: var(--secondary-color);
    padding: 25px;
    border-radius: 8px;
    margin: 20px 0;
    border-left: 3px solid var(--blue-accent);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.highlight-box i {
    color: var(--blue-accent);
    margin-right: 8px;
}

/* Countdown Grid */
.countdown-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.countdown-card {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--accent-color) 100%);
    padding: 25px;
    border-radius: 8px;
    text-align: center;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

:root[data-theme="light"] .countdown-card {
    background: linear-gradient(135deg, #ffffff 0%, #e8e8e8 100%);
    border: 1px solid #d0d0d0;
}

.countdown-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.countdown-card:hover::before {
    left: 100%;
}

.countdown-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(255, 255, 255, 0.1);
    border-color: var(--success-color);
}

.countdown-card h3 {
    font-size: 1rem;
    color: #ffffff;
    margin-bottom: 15px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.countdown-display {
    font-size: 1.8rem;
    color: var(--success-color);
    font-weight: 700;
    margin: 15px 0;
    font-family: 'Courier New', monospace;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
    animation: pulse 2s ease-in-out infinite;
}

/* Light mode: make countdown text more visible */
:root[data-theme="light"] .countdown-display {
    color: #1a1a1a;
    text-shadow: none;
}

:root[data-theme="light"] .countdown-card h3 {
    color: var(--highlight-color);
}

:root[data-theme="light"] .countdown-card small {
    color: var(--light-text);
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.8;
    }
}

.countdown-card small {
    color: #ffffff;
    font-size: 0.85rem;
}

/* Scientific Chart Sections */
.scientific-chart-section {
    margin: 40px 0;
    padding: 30px;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.03), rgba(197, 108, 240, 0.03));
    border-radius: 12px;
    border: 1px solid rgba(0, 212, 255, 0.15);
}

.scientific-chart-section h3 {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--success-color);
    letter-spacing: 1px;
}

.scientific-chart-section h3 i {
    color: var(--blue-accent);
    margin-right: 10px;
}

.scientific-chart-section .chart-container {
    background: transparent;
    border: none;
    padding: 0;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.stat-card {
    background: var(--secondary-color);
    padding: 25px;
    border-radius: 8px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.stat-card h3 {
    font-size: 0.9rem;
    color: #ffffff;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stat-card p {
    font-size: 1.4rem;
    color: var(--success-color);
    font-weight: 700;
}

/* Light mode: make stat values more visible */
:root[data-theme="light"] .stat-card p {
    color: #1a1a1a;
}

:root[data-theme="light"] .stat-card h3 {
    color: var(--light-text);
}

/* Timeline */
.timeline {
    position: relative;
    padding: 20px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
}

.timeline-item {
    position: relative;
    padding-left: 70px;
    margin-bottom: 30px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 24px;
    top: 5px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--success-color);
    border: 2px solid var(--primary-color);
}

.timeline-date {
    font-weight: 700;
    color: var(--success-color);
    margin-bottom: 5px;
}

.timeline-content {
    background-color: var(--secondary-color);
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

/* Two Column Layout */
.two-column {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 20px 0;
}

/* Info Box */
.info-box {
    background: var(--secondary-color);
    padding: 25px;
    border-radius: 8px;
    margin: 20px 0;
    border: 1px solid var(--border-color);
}

/* Analytics Dashboard */
.analytics-intro {
    background: var(--secondary-color);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
    text-align: center;
    border-left: 3px solid var(--success-color);
}

/* Real-Time Stats Panel */
.realtime-stats-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.realtime-stat {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--accent-color) 100%);
    padding: 25px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

/* Light mode: better gradient for cards */
:root[data-theme="light"] .realtime-stat {
    background: linear-gradient(135deg, #ffffff 0%, #e8e8e8 100%);
    border: 1px solid #d0d0d0;
}

:root[data-theme="light"] .milestone-card {
    background: linear-gradient(135deg, #ffffff 0%, #e8e8e8 100%);
    border: 1px solid #d0d0d0;
}

:root[data-theme="light"] .temp-info-card {
    background: linear-gradient(135deg, #ffffff 0%, #e8e8e8 100%);
    border: 1px solid #d0d0d0;
}

:root[data-theme="light"] .visitor-timeline-card {
    background: linear-gradient(135deg, #ffffff 0%, #e8e8e8 100%);
    border: 1px solid #d0d0d0;
}

.realtime-stat::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 100%;
    background: linear-gradient(180deg, var(--blue-accent), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0%, 100% {
        opacity: 0.5;
    }
    50% {
        opacity: 1;
    }
}

.realtime-stat:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 212, 255, 0.2);
    border-color: var(--blue-accent);
}

.stat-info {
    flex: 1;
    text-align: center;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--light-text);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 5px;
}

.stat-value {
    font-size: 1.6rem;
    color: var(--success-color);
    font-weight: 700;
    margin-bottom: 5px;
    font-family: 'Courier New', monospace;
}

.stat-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 0.75rem;
    color: var(--light-text);
}

.live-indicator {
    color: #3ae374;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background: #3ae374;
    border-radius: 50%;
    animation: pulse-animation 2s infinite;
    box-shadow: 0 0 5px #3ae374;
}

@keyframes pulse-animation {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.5;
        transform: scale(1.2);
    }
}

/* Distance Milestones Section */
.milestones-intro {
    text-align: center;
    color: var(--light-text);
    margin-bottom: 30px;
    font-size: 1.05rem;
}

.milestones-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin: 30px 0;
}

.milestone-card {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--accent-color) 100%);
    padding: 30px;
    border-radius: 15px;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.milestone-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--blue-accent) 0%, var(--success-color) 100%);
}

.milestone-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 212, 255, 0.25);
    border-color: var(--blue-accent);
}

.milestone-card.highlight-card {
    background: linear-gradient(135deg, rgba(58, 227, 116, 0.1) 0%, rgba(0, 212, 255, 0.1) 100%);
    border-color: var(--success-color);
}

.milestone-card.highlight-card::before {
    background: var(--success-color);
}

.milestone-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--blue-accent) 0%, var(--success-color) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 15px;
    font-size: 1.8rem;
    color: var(--bg-color);
}

.milestone-card h3 {
    font-size: 1rem;
    color: var(--light-text);
    margin-bottom: 15px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.milestone-value {
    font-size: 2.2rem;
    color: var(--success-color);
    font-weight: 700;
    margin-bottom: 8px;
    font-family: 'Courier New', monospace;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: numberGlow 2s ease-in-out infinite;
}

@keyframes numberGlow {
    0%, 100% {
        text-shadow: 0 0 10px rgba(58, 227, 116, 0.5);
    }
    50% {
        text-shadow: 0 0 20px rgba(58, 227, 116, 0.8);
    }
}

.milestone-subtext {
    font-size: 0.85rem;
    color: var(--light-text);
    margin-bottom: 15px;
    opacity: 0.8;
}

.unit-toggle {
    display: flex;
    gap: 5px;
    margin-top: 15px;
    background: rgba(0, 0, 0, 0.3);
    padding: 5px;
    border-radius: 8px;
}

.unit-btn {
    background: transparent;
    color: var(--light-text);
    border: 1px solid transparent;
    padding: 6px 12px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.3s ease;
    font-weight: 500;
}

.unit-btn:hover {
    background: rgba(0, 212, 255, 0.2);
    border-color: var(--blue-accent);
}

.unit-btn.active {
    background: var(--blue-accent);
    color: var(--bg-color);
    font-weight: 700;
}

/* Temperature & Solar Heating Section */
.temperature-intro {
    text-align: center;
    color: var(--light-text);
    margin-bottom: 30px;
    font-size: 1.05rem;
}

.temperature-grid {
    display: flex;
    flex-direction: column;
    gap: 30px;
    margin: 30px 0;
}

.full-width {
    width: 100%;
}

.chart-note {
    font-size: 0.85rem;
    color: var(--light-text);
    font-style: italic;
    margin-top: 10px;
    opacity: 0.8;
}

.temp-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.temp-info-card {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--accent-color) 100%);
    padding: 25px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.temp-info-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--blue-accent) 0%, var(--success-color) 100%);
}

.temp-info-card.highlight {
    border-color: var(--success-color);
    box-shadow: 0 4px 15px rgba(58, 227, 116, 0.2);
}

.temp-info-card.highlight::before {
    background: var(--success-color);
    height: 4px;
}

.temp-info-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 212, 255, 0.2);
}

.temp-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--blue-accent) 0%, var(--success-color) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
    font-size: 1.5rem;
    color: var(--bg-color);
}

.temp-info-card h3 {
    font-size: 0.95rem;
    color: #ffffff;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

/* Light mode: make temp card headings darker */
:root[data-theme="light"] .temp-info-card h3 {
    color: var(--highlight-color);
}

.temp-value {
    font-size: 1.8rem;
    color: var(--success-color);
    font-weight: 700;
    margin-bottom: 5px;
    font-family: 'Courier New', monospace;
}

/* Light mode: make temp values darker */
:root[data-theme="light"] .temp-value {
    color: #1a1a1a;
}

.temp-info-card p {
    font-size: 0.9rem;
    color: var(--text-color);
    margin-bottom: 8px;
}

.temp-info-card small {
    font-size: 0.8rem;
    color: var(--light-text);
    opacity: 0.8;
}

/* Interstellar Visitors Timeline Section */
.comparison-intro {
    text-align: center;
    color: var(--light-text);
    margin-bottom: 40px;
    font-size: 1.05rem;
}

.visitors-timeline-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin: 40px 0;
}

.visitor-timeline-card {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--accent-color) 100%);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 30px;
    transition: all 0.3s ease;
    position: relative;
}

.visitor-timeline-card.active {
    border-color: var(--success-color);
    box-shadow: 0 8px 30px rgba(58, 227, 116, 0.3);
}

.visitor-timeline-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(0, 212, 255, 0.2);
}

.visitor-header {
    text-align: center;
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
}

.visitor-number {
    display: inline-block;
    background: linear-gradient(135deg, var(--blue-accent), var(--success-color));
    color: var(--bg-color);
    font-size: 1.5rem;
    font-weight: 700;
    padding: 8px 20px;
    border-radius: 25px;
    margin-bottom: 10px;
}

.visitor-header h3 {
    font-size: 1.8rem;
    margin: 10px 0 5px 0;
    color: var(--text-color);
}

.visitor-type {
    font-size: 0.9rem;
    color: var(--light-text);
    margin: 0;
}

.live-badge {
    display: inline-block;
    background: var(--success-color);
    color: var(--bg-color);
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.7rem;
    font-weight: 700;
    animation: pulse-badge 2s infinite;
}

@keyframes pulse-badge {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.05); }
}

.timeline-events {
    margin: 20px 0;
}

.event {
    display: flex;
    gap: 15px;
    align-items: flex-start;
    margin-bottom: 20px;
    padding: 15px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 10px;
    border-left: 3px solid var(--blue-accent);
}

.event.completed {
    opacity: 0.7;
    border-left-color: var(--success-color);
}

.event.upcoming {
    border-left-color: var(--blue-accent);
    animation: upcomingGlow 3s ease-in-out infinite;
}

@keyframes upcomingGlow {
    0%, 100% { box-shadow: 0 0 0 rgba(0, 212, 255, 0); }
    50% { box-shadow: 0 0 15px rgba(0, 212, 255, 0.3); }
}

.event-icon {
    flex-shrink: 0;
    width: 35px;
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--blue-accent), var(--success-color));
    border-radius: 50%;
    color: var(--bg-color);
    font-size: 0.9rem;
}

.event-content {
    flex: 1;
    font-size: 0.95rem;
}

.event-content strong {
    color: var(--text-color);
}

.event-content small {
    color: var(--light-text);
    opacity: 0.8;
}

.visitor-stats {
    display: flex;
    gap: 15px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 2px solid var(--border-color);
}

.stat-item {
    flex: 1;
    text-align: center;
    padding: 15px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 10px;
}

.stat-value {
    display: block;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--success-color);
    margin-bottom: 5px;
}

.stat-label {
    display: block;
    font-size: 0.8rem;
    color: var(--light-text);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.comparison-insights {
    margin-top: 50px;
}

.insights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.insight-card {
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(58, 227, 116, 0.1));
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    transition: all 0.3s ease;
}

.insight-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 212, 255, 0.2);
    border-color: var(--blue-accent);
}

.insight-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--blue-accent), var(--success-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-color);
    font-size: 1.3rem;
    margin-bottom: 15px;
}

.insight-card h4 {
    color: var(--text-color);
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.insight-card p {
    color: var(--light-text);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Solar System Visualization Section */
.solarsystem-intro {
    text-align: center;
    color: var(--light-text);
    margin-bottom: 30px;
    font-size: 1.05rem;
}

.viz-container {
    width: 100%;
    height: 700px;
    background: radial-gradient(circle at center, #0a0a0a 0%, #000000 100%);
    border: 2px solid var(--border-color);
    border-radius: 15px;
    margin: 30px 0;
    position: relative;
    overflow: hidden;
}

/* Light mode: fix Interactive Solar System View backgrounds */
:root[data-theme="light"] .viz-container {
    background: radial-gradient(circle at center, #e0e0e0 0%, #f5f5f5 100%);
    border: 2px solid #c0c0c0;
}

:root[data-theme="light"] .viz-controls {
    background: linear-gradient(135deg, #ffffff 0%, #e8e8e8 100%);
    border: 1px solid #d0d0d0;
}

.viz-controls {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--accent-color) 100%);
    padding: 25px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin-bottom: 20px;
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: center;
    justify-content: space-between;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 15px;
    flex: 1;
    min-width: 300px;
}

.control-group label {
    color: var(--text-color);
    font-weight: 600;
    font-size: 0.95rem;
}

#date-slider {
    flex: 1;
    height: 8px;
    border-radius: 5px;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
}

#date-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--blue-accent);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
}

#date-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--blue-accent);
    cursor: pointer;
    border: none;
    box-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
}

#current-date-display {
    color: var(--success-color);
    font-weight: 700;
    font-size: 1.1rem;
    min-width: 120px;
    font-family: 'Courier New', monospace;
}

.control-buttons {
    display: flex;
    gap: 10px;
}

.viz-btn {
    background: var(--blue-accent);
    color: var(--bg-color);
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

:root[data-theme="light"] .viz-btn {
    color: #ffffff;
}

.viz-btn:hover {
    background: var(--success-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 212, 255, 0.3);
}

:root[data-theme="light"] .viz-btn:hover {
    background: #0099cc;
    color: #ffffff;
}

.speed-control {
    display: flex;
    align-items: center;
    gap: 10px;
}

.speed-control label {
    color: var(--text-color);
    font-weight: 600;
    font-size: 0.95rem;
}

.speed-btn {
    background: rgba(0, 0, 0, 0.3);
    color: var(--light-text);
    border: 1px solid var(--border-color);
    padding: 8px 15px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.85rem;
    transition: all 0.3s ease;
}

:root[data-theme="light"] .speed-btn {
    background: #ffffff;
    color: var(--highlight-color);
    border: 1px solid #c0c0c0;
}

.speed-btn:hover {
    background: rgba(0, 212, 255, 0.2);
    border-color: var(--blue-accent);
}

:root[data-theme="light"] .speed-btn:hover {
    background: rgba(0, 153, 204, 0.15);
    border-color: var(--blue-accent);
}

.speed-btn.active {
    background: var(--blue-accent);
    color: var(--bg-color);
    border-color: var(--blue-accent);
}

:root[data-theme="light"] .speed-btn.active {
    background: var(--blue-accent);
    color: #ffffff;
    border-color: var(--blue-accent);
}

.viz-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    padding: 20px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 10px;
    margin: 20px 0;
}

:root[data-theme="light"] .viz-legend {
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid #d0d0d0;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-color);
    font-size: 0.9rem;
}

.legend-color {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.viz-info {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--accent-color) 100%);
    padding: 25px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin-top: 20px;
}

:root[data-theme="light"] .viz-info {
    background: linear-gradient(135deg, #ffffff 0%, #e8e8e8 100%);
    border: 1px solid #d0d0d0;
}

.viz-info h3 {
    color: var(--success-color);
    margin-bottom: 15px;
    text-align: center;
}

:root[data-theme="light"] .viz-info h3 {
    color: #1a1a1a;
}

.position-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
}

.pos-item {
    display: flex;
    justify-content: space-between;
    padding: 12px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    border-left: 3px solid var(--blue-accent);
}

:root[data-theme="light"] .pos-item {
    background: rgba(255, 255, 255, 0.6);
    border: 1px solid #d0d0d0;
    border-left: 3px solid var(--blue-accent);
}

.pos-item strong {
    color: var(--text-color);
}

.pos-item span {
    color: var(--success-color);
    font-family: 'Courier New', monospace;
    font-weight: 700;
}

:root[data-theme="light"] .pos-item span {
    color: #1a1a1a;
}

/* Loading Spinner */
.loading-spinner {
    display: inline-block;
    width: 30px;
    height: 30px;
    border: 3px solid var(--border-color);
    border-top-color: var(--blue-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
    margin: 30px 0;
}

.charts-grid-single {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    margin: 30px 0;
}

.chart-container {
    background: var(--secondary-color);
    padding: 25px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    min-height: 400px;
}

.gauge-container {
    min-height: 300px;
}

.chart-container h3 {
    color: var(--success-color);
    margin-bottom: 20px;
    font-size: 1.1rem;
    text-align: center;
}

@media (max-width: 768px) {
    nav .container {
        flex-direction: column;
        gap: 10px;
        padding-bottom: 15px;
    }

    nav ul {
        width: 100%;
        justify-content: center;
    }

    .theme-toggle {
        padding: 8px 16px;
        font-size: 0.95rem;
        align-self: center;
        margin-top: 5px;
        margin-bottom: 5px;
        min-width: 50px;
    }

    .theme-toggle i {
        font-size: 1rem;
    }

    .charts-grid {
        grid-template-columns: 1fr;
    }

    .chart-container {
        padding: 15px;
        min-height: 350px;
    }

    .chart-container h3 {
        font-size: 1rem;
        margin-bottom: 15px;
    }

    /* Make charts more touch-friendly on mobile */
    .highcharts-container {
        touch-action: pan-y pinch-zoom;
    }
}

/* Tracking Section */
.tracking-intro {
    background: var(--secondary-color);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
    text-align: center;
    border-left: 3px solid var(--success-color);
}

.tracking-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin: 25px 0;
}

.tracking-card {
    background: var(--secondary-color);
    padding: 30px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    text-align: center;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.tracking-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(255, 255, 255, 0.1);
    border-color: var(--success-color);
}

.tracking-card h3 {
    color: var(--success-color);
    font-size: 1.2rem;
    margin: 0;
}

.tracking-card h3 i {
    color: var(--blue-accent);
    margin-right: 8px;
}

.tracking-card p {
    color: var(--text-color);
    font-size: 0.95rem;
    margin: 0;
    flex-grow: 1;
}

.tracking-button {
    display: inline-block;
    background: linear-gradient(135deg, var(--blue-accent) 0%, #0099cc 100%);
    color: var(--primary-color);
    padding: 12px 24px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    margin: 10px 0;
}

.tracking-button:hover {
    background: linear-gradient(135deg, #00f0ff 0%, var(--blue-accent) 100%);
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(0, 212, 255, 0.3);
}

.tracking-button i {
    margin-right: 8px;
}

.tracking-card small {
    color: var(--light-text);
    font-size: 0.8rem;
    font-style: italic;
}

/* Mission Grid */
.mission-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin: 25px 0;
}

.mission-card {
    background-color: var(--secondary-color);
    padding: 25px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.mission-card h4 {
    color: var(--success-color);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.mission-card ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.mission-card li {
    display: inline-block;
    padding: 6px 14px;
    background-color: var(--accent-color);
    border-radius: 4px;
    font-size: 0.9rem;
}

/* Light mode: make mission badges white */
:root[data-theme="light"] .mission-card li {
    background-color: #ffffff;
    border: 1px solid #d0d0d0;
    color: var(--highlight-color);
}

/* Safety Notice */
.safety-notice {
    background-color: var(--secondary-color);
    border: 1px solid var(--border-color);
    padding: 20px;
    border-radius: 8px;
    margin: 25px 0;
    text-align: center;
}

/* Articles Grid */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
    margin: 25px 0;
}

.article-card {
    background-color: var(--primary-color);
    padding: 25px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border-color: var(--success-color);
}

.article-card h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--text-color);
}

.article-card .source {
    color: var(--light-text);
    font-size: 0.9rem;
    margin-bottom: 15px;
    font-style: italic;
}

.article-card a {
    color: var(--success-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.article-card a:hover {
    color: var(--light-text);
}

/* Image Gallery */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 25px;
    margin: 30px 0;
}

.gallery-item {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.gallery-item a {
    display: block;
    text-decoration: none;
    color: inherit;
}

.gallery-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(0, 212, 255, 0.2);
    border-color: var(--blue-accent);
}

.gallery-item img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease;
}

.gallery-item:hover img {
    transform: scale(1.05);
}

.gallery-caption {
    padding: 20px;
    background: linear-gradient(180deg, var(--card-bg) 0%, var(--secondary-color) 100%);
}

.gallery-caption h4 {
    color: var(--success-color);
    font-size: 1.1rem;
    margin-bottom: 8px;
    font-weight: 600;
}

.gallery-caption p {
    color: var(--text-color);
    font-size: 0.9rem;
    margin-bottom: 10px;
    line-height: 1.5;
}

.gallery-meta {
    display: block;
    color: var(--light-text);
    font-size: 0.8rem;
    font-style: italic;
}

.gallery-note {
    text-align: center;
    color: var(--light-text);
    font-size: 0.9rem;
    margin-top: 30px;
    padding: 15px;
    background: rgba(0, 212, 255, 0.05);
    border-radius: 8px;
    border: 1px solid rgba(0, 212, 255, 0.1);
}

.gallery-note i {
    color: var(--blue-accent);
    margin-right: 8px;
}

.gallery-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 250px;
    padding: 30px 20px;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.05), rgba(197, 108, 240, 0.05));
    text-align: center;
}

.gallery-placeholder i {
    opacity: 0.6;
}

/* Resources Grid */
.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin: 25px 0;
}

.resource-card {
    background-color: var(--primary-color);
    padding: 25px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.resource-card.official {
    border-color: var(--success-color);
    background: var(--secondary-color);
}

.resource-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.resource-card h3 {
    color: var(--success-color);
    font-size: 1.3rem;
    margin-bottom: 10px;
}

.resource-card p {
    color: var(--light-text);
    margin-bottom: 15px;
    font-size: 0.95rem;
}

.resource-card a {
    color: var(--success-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.resource-card a:hover {
    color: var(--light-text);
}

/* Facts Grid */
.facts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin: 25px 0;
}

.fact-card {
    background: var(--secondary-color);
    padding: 25px;
    border-radius: 8px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.fact-card:hover {
    transform: scale(1.05);
    border-color: var(--success-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.fact-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--success-color);
    margin-bottom: 15px;
}

.fact-card p {
    font-size: 0.95rem;
    line-height: 1.5;
}

.fact-source {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

.fact-source a {
    color: var(--light-text);
    text-decoration: none;
    font-size: 0.8rem;
    transition: color 0.3s ease;
}

.fact-source a:hover {
    color: var(--success-color);
}

/* Lists */
ul {
    list-style: none;
    padding-left: 0;
}

ul li {
    padding: 8px 0;
    padding-left: 0;
}

/* Footer */
footer {
    background-color: var(--primary-color);
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    margin-top: 40px;
}

footer p {
    margin: 10px 0;
    color: var(--light-text);
}

.disclaimer {
    font-size: 0.85rem;
    font-style: italic;
    max-width: 800px;
    margin: 15px auto;
}

.editorial-policy {
    background: var(--secondary-color);
    padding: 25px;
    border-radius: 8px;
    margin: 25px auto;
    max-width: 900px;
    border: 1px solid var(--border-color);
    text-align: left;
}

.editorial-policy h3 {
    color: var(--success-color);
    font-size: 1.2rem;
    margin-bottom: 15px;
    text-align: center;
}

.editorial-policy p {
    margin: 12px 0;
    line-height: 1.7;
    color: var(--text-color);
    font-size: 0.95rem;
}

.editorial-policy strong {
    color: var(--success-color);
}

.update-date {
    color: var(--text-color);
    font-weight: 600;
}

.website-url {
    color: var(--light-text);
    font-size: 0.9rem;
    margin-top: 10px;
}

.website-url i {
    margin-right: 8px;
    color: var(--blue-accent);
}

.version-info {
    color: #555;
    font-size: 0.65rem;
    margin-top: 15px;
    opacity: 0.5;
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2.5rem;
        letter-spacing: 4px;
    }

    .subtitle {
        font-size: 1rem;
    }

    nav ul {
        gap: 0;
        flex-wrap: wrap;
    }

    nav a {
        padding: 14px 12px;
        font-size: 0.7rem;
        letter-spacing: 0.2px;
    }

    .section {
        padding: 25px;
    }

    .section h2 {
        font-size: 1.5rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .countdown-grid {
        grid-template-columns: 1fr;
    }

    .scientific-chart-section {
        padding: 20px;
    }

    .scientific-chart-section h3 {
        font-size: 1.3rem;
    }

    .charts-grid {
        grid-template-columns: 1fr;
    }

    .chart-container {
        min-height: 300px;
    }

    .gauge-container {
        min-height: 250px;
    }

    .tracking-grid {
        grid-template-columns: 1fr;
    }

    .timeline::before {
        left: 15px;
    }

    .timeline-item {
        padding-left: 45px;
    }

    .timeline-item::before {
        left: 9px;
    }

    .articles-grid,
    .resources-grid {
        grid-template-columns: 1fr;
    }

    .two-column {
        grid-template-columns: 1fr;
    }

    .editorial-policy {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 2rem;
        letter-spacing: 2px;
    }

    .container {
        padding: 0 15px;
    }

    nav .container {
        padding-bottom: 12px;
    }

    .section {
        padding: 20px;
    }

    nav a {
        padding: 12px 8px;
        font-size: 0.65rem;
    }

    .theme-toggle {
        padding: 8px 14px;
        font-size: 0.9rem;
        margin-top: 8px;
        margin-bottom: 5px;
        align-self: center;
    }

    .theme-toggle i {
        font-size: 0.95rem;
    }

    .chart-container {
        padding: 15px;
        min-height: 280px;
    }

    .stat-card,
    .countdown-card {
        padding: 20px;
    }

    .gallery-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .gallery-item img {
        height: 200px;
    }

    .scroll-to-top {
        width: 45px;
        height: 45px;
        bottom: 15px;
        right: 15px;
    }

    .scroll-to-top i {
        font-size: 18px;
    }
}

/* Scroll to Top Button */
.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--blue-accent) 0%, #0099cc 100%);
    color: var(--primary-color);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 212, 255, 0.3);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-to-top:hover {
    background: linear-gradient(135deg, #00f0ff 0%, var(--blue-accent) 100%);
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(0, 212, 255, 0.5);
}

.scroll-to-top:active {
    transform: translateY(-2px);
}

.scroll-to-top i {
    font-size: 20px;
    font-weight: bold;
}

/* Chart Loading Skeletons */
.chart-skeleton {
    background: linear-gradient(90deg, #1a1a1a 25%, #2a2a2a 50%, #1a1a1a 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: 8px;
    height: 350px;
    position: relative;
    overflow: hidden;
}

.chart-skeleton::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 50px;
    height: 50px;
    border: 3px solid rgba(0, 212, 255, 0.3);
    border-top-color: var(--blue-accent);
    border-radius: 50%;
    animation: skeleton-spin 1s linear infinite;
}

@keyframes skeleton-loading {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

@keyframes skeleton-spin {
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

.chart-container.loading > div:not(.chart-skeleton) {
    display: none;
}

.chart-container.loaded .chart-skeleton {
    display: none;
}