/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-bg: #0a0e27;
    --secondary-bg: #1a1f3a;
    --accent-purple: #a855f7;
    --accent-blue: #3b82f6;
    --accent-cyan: #06b6d4;
    --accent-pink: #ec4899;
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --glow-purple: rgba(168, 85, 247, 0.5);
    --glow-blue: rgba(59, 130, 246, 0.5);
    --glow-cyan: rgba(6, 182, 212, 0.5);
    --bg-gradient-start: #0a0e27;
    --bg-gradient-mid: #1a1f3a;
    --bg-gradient-end: #0f1729;
    --panel-bg: rgba(26, 31, 58, 0.95);
    --control-bg: rgba(10, 14, 39, 0.8);
    --nav-bg: rgba(10, 14, 39, 0.8);
    --border-color: rgba(168, 85, 247, 0.3);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-mid) 50%, var(--bg-gradient-end) 100%);
    color: var(--text-primary);
    overflow-x: hidden;
    min-height: 100vh;
    transition: background 0.3s ease, color 0.3s ease;
}

/* Stars Canvas Background */
#stars-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1.5rem 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    transition: background 0.3s ease;
}

.nav-center {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.solar-system-selector {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1.25rem;
    background: rgba(168, 85, 247, 0.1);
    border: 1px solid rgba(168, 85, 247, 0.3);
    border-radius: 50px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.solar-system-selector:hover {
    background: rgba(168, 85, 247, 0.15);
    border-color: rgba(168, 85, 247, 0.5);
    box-shadow: 0 0 20px rgba(168, 85, 247, 0.3);
}

.selector-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
}

.system-dropdown {
    background: var(--control-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    outline: none;
    transition: all 0.3s ease;
    font-family: inherit;
    min-width: 200px;
}

.system-dropdown:hover {
    background: var(--panel-bg);
    border-color: var(--accent-purple);
    box-shadow: 0 0 15px var(--glow-purple);
}

.system-dropdown:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 20px var(--glow-cyan);
}

.system-dropdown option {
    background: var(--panel-bg);
    color: var(--text-primary);
    padding: 0.75rem;
    font-weight: 500;
}

/* Nav Camera Controls */
.nav-camera-controls {
    display: flex;
    gap: 0.25rem;
}

.nav-control-btn {
    background: rgba(168, 85, 247, 0.15);
    border: 1px solid rgba(168, 85, 247, 0.3);
    color: var(--text-primary);
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1.25rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-control-btn:hover {
    background: rgba(168, 85, 247, 0.3);
    border-color: var(--accent-purple);
    box-shadow: 0 0 15px rgba(168, 85, 247, 0.4);
    transform: translateY(-2px);
}

.nav-control-btn:active {
    transform: translateY(0);
}

/* Nav Speed Control */
.nav-speed-control {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: rgba(168, 85, 247, 0.1);
    border: 1px solid rgba(168, 85, 247, 0.3);
    border-radius: 20px;
}

.nav-speed-control .speed-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

.nav-slider {
    width: 80px;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    border-radius: 2px;
    background: linear-gradient(to right, rgba(168, 85, 247, 0.3), rgba(6, 182, 212, 0.5));
    outline: none;
    cursor: pointer;
}

.nav-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(168, 85, 247, 0.6);
}

.nav-slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 6px rgba(168, 85, 247, 0.6);
}

.speed-value {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent-cyan);
    min-width: 35px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
}

.logo-icon {
    font-size: 1.75rem;
    color: var(--accent-purple);
    animation: rotate 20s linear infinite;
}

.logo-text {
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-controls {
    display: flex;
    gap: 1rem;
}

.btn-icon {
    background: rgba(168, 85, 247, 0.1);
    border: 1px solid rgba(168, 85, 247, 0.3);
    color: var(--text-primary);
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.25rem;
}

.btn-icon:hover {
    background: rgba(168, 85, 247, 0.2);
    border-color: var(--accent-purple);
    box-shadow: 0 0 20px var(--glow-purple);
    transform: translateY(-2px);
}

/* Hero Section */
.hero {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    text-align: center;
}

.hero-content {
    max-width: 800px;
}

.hero-title {
    font-size: 4.5rem;
    font-weight: 900;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.title-line {
    display: block;
}

.glow-text {
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 40px var(--glow-purple);
    animation: pulse-glow 3s ease-in-out infinite;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
    border: none;
    color: var(--text-primary);
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(168, 85, 247, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(168, 85, 247, 0.5);
}

.btn-arrow {
    font-size: 1.5rem;
    transition: transform 0.3s ease;
}

.btn-primary:hover .btn-arrow {
    transform: translateX(5px);
}

.scroll-indicator {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    opacity: 0.7;
    animation: bounce 2s ease-in-out infinite;
}

.mouse {
    width: 28px;
    height: 45px;
    border: 2px solid var(--accent-purple);
    border-radius: 20px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 10px;
    background: var(--accent-purple);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll-wheel 2s ease-in-out infinite;
}

.scroll-indicator p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Solar System Section */
.solar-system-section {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

#solar-system-container {
    width: 100%;
    height: 100vh;
    position: relative;
}

.controls-overlay {
    position: absolute;
    bottom: 2rem;
    left: 2rem;
    display: flex;
    gap: 2rem;
    background: rgba(10, 14, 39, 0.8);
    padding: 1rem 2rem;
    border-radius: 50px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(168, 85, 247, 0.2);
}

.control-hint {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.hint-icon {
    font-size: 1.25rem;
}

/* Planet Navigation Menu */
.planet-nav {
    position: fixed;
    left: 2rem;
    top: 50%;
    transform: translateY(-50%);
    z-index: 150;
}

.planet-nav-toggle {
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
    border: none;
    color: var(--text-primary);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    box-shadow: 0 10px 30px rgba(168, 85, 247, 0.3);
    transition: all 0.3s ease;
}

.planet-nav-toggle:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(168, 85, 247, 0.5);
}

.planet-nav-menu {
    position: absolute;
    left: 0;
    bottom: calc(100% + 1rem);
    background: var(--panel-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 0.5rem;
    min-width: 200px;
    max-height: 400px;
    overflow-y: auto;
    overflow-x: hidden;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: rgba(168, 85, 247, 0.5) rgba(10, 14, 39, 0.5);
}

.planet-nav-menu::-webkit-scrollbar {
    width: 6px;
}

.planet-nav-menu::-webkit-scrollbar-track {
    background: rgba(10, 14, 39, 0.5);
    border-radius: 10px;
}

.planet-nav-menu::-webkit-scrollbar-thumb {
    background: rgba(168, 85, 247, 0.5);
    border-radius: 10px;
}

.planet-nav-menu::-webkit-scrollbar-thumb:hover {
    background: rgba(168, 85, 247, 0.7);
}

.planet-nav-menu.hidden {
    opacity: 0;
    transform: translateY(10px);
    pointer-events: none;
}

.planet-search-container {
    position: relative;
    margin-bottom: 0.5rem;
    padding: 0 0.25rem;
}

.planet-search-input {
    width: 100%;
    background: var(--control-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.6rem 2rem 0.6rem 0.75rem;
    border-radius: 10px;
    font-size: 0.9rem;
    outline: none;
    transition: all 0.3s ease;
    font-family: inherit;
}

.planet-search-input::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.planet-search-input:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 0 3px var(--glow-cyan);
    background: var(--panel-bg);
}

.search-icon {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1rem;
    opacity: 0.5;
    pointer-events: none;
}

#planet-nav-list {
    max-height: 300px;
    overflow-y: auto;
}

.planet-nav-item {
    width: 100%;
    background: transparent;
    border: none;
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    text-align: left;
    cursor: pointer;
    border-radius: 10px;
    font-size: 0.95rem;
    transition: all 0.2s ease;
    display: block;
}

.planet-nav-item.hidden {
    display: none;
}

.planet-nav-item:hover {
    background: rgba(168, 85, 247, 0.2);
    transform: translateX(5px);
}

.search-no-results {
    padding: 1rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.search-no-results.hidden {
    display: none;
}

/* Orbit Control */
.orbit-control {
    position: fixed;
    right: 2rem;
    bottom: 2rem;
    z-index: 150;
}

.orbit-control-btn {
    background: rgba(26, 31, 58, 0.9);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(168, 85, 247, 0.3);
    color: var(--text-primary);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

.orbit-control-btn:hover {
    background: rgba(168, 85, 247, 0.2);
    border-color: var(--accent-purple);
    box-shadow: 0 8px 30px rgba(168, 85, 247, 0.4);
    transform: translateY(-2px);
}

/* Camera Controls */
/* Modal section styling */
.modal-section {
    margin-bottom: 1.5rem;
}

.modal-section h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.camera-preset-buttons {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.camera-preset-btn {
    background: rgba(168, 85, 247, 0.1);
    border: 1px solid rgba(168, 85, 247, 0.3);
    color: var(--text-primary);
    padding: 0.5rem 0.75rem;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    font-size: 1.25rem;
    transition: all 0.3s ease;
    min-width: 60px;
}

.camera-preset-btn .btn-label {
    font-size: 0.75rem;
    font-weight: 600;
}

.camera-preset-btn:hover {
    background: rgba(168, 85, 247, 0.2);
    border-color: var(--accent-purple);
    box-shadow: 0 5px 15px rgba(168, 85, 247, 0.4);
    transform: translateY(-2px);
}

.camera-preset-btn:active {
    transform: translateY(0);
}

/* Time Speed Controls (now in modal) */

.time-speed-slider {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.speed-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    min-width: 30px;
}

.slider {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    border-radius: 3px;
    background: linear-gradient(to right, rgba(168, 85, 247, 0.3), rgba(6, 182, 212, 0.5));
    outline: none;
    cursor: pointer;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(168, 85, 247, 0.6);
    transition: all 0.3s ease;
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 3px 12px rgba(168, 85, 247, 0.8);
}

.slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 8px rgba(168, 85, 247, 0.6);
    transition: all 0.3s ease;
}

.slider::-moz-range-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 3px 12px rgba(168, 85, 247, 0.8);
}

.speed-display {
    text-align: center;
    margin-bottom: 0.75rem;
}

#speed-value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent-cyan);
}

.toggle-trails-btn {
    width: 100%;
    background: rgba(168, 85, 247, 0.1);
    border: 1px solid rgba(168, 85, 247, 0.3);
    color: var(--text-primary);
    padding: 0.6rem;
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.toggle-trails-btn .btn-label {
    font-size: 0.85rem;
}

.toggle-trails-btn:hover {
    background: rgba(168, 85, 247, 0.2);
    border-color: var(--accent-purple);
    box-shadow: 0 5px 15px rgba(168, 85, 247, 0.4);
    transform: translateY(-2px);
}

.toggle-trails-btn:active {
    transform: translateY(0);
}

/* Planet Hover Label */
.planet-label {
    position: fixed;
    padding: 0.5rem 1rem;
    background: rgba(26, 31, 58, 0.95);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(168, 85, 247, 0.3);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 600;
    pointer-events: none;
    z-index: 200;
    transition: opacity 0.2s ease;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.5);
}

.planet-label.hidden {
    opacity: 0;
}

.planet-label::before {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid rgba(168, 85, 247, 0.3);
}

/* Planet Information Panel */
.planet-panel {
    position: fixed;
    top: 50%;
    right: 2rem;
    transform: translateY(-50%);
    width: 400px;
    max-height: 80vh;
    background: rgba(26, 31, 58, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(168, 85, 247, 0.3);
    border-radius: 20px;
    padding: 2rem;
    z-index: 200;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.planet-panel.hidden {
    opacity: 0;
    transform: translateY(-50%) translateX(500px);
    pointer-events: none;
}

.panel-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 2rem;
    cursor: pointer;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.panel-close:hover {
    background: rgba(168, 85, 247, 0.2);
    transform: rotate(90deg);
}

.planet-name {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.planet-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat {
    background: rgba(168, 85, 247, 0.1);
    padding: 1rem;
    border-radius: 12px;
    border: 1px solid rgba(168, 85, 247, 0.2);
}

.stat-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stat-value {
    display: block;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent-cyan);
}

.planet-description {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.planet-facts h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--accent-purple);
}

.planet-facts ul {
    list-style: none;
}

.planet-facts li {
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    background: rgba(59, 130, 246, 0.1);
    border-left: 3px solid var(--accent-blue);
    border-radius: 4px;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    z-index: 300;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    transition: all 0.3s ease;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: rgba(26, 31, 58, 0.95);
    border: 1px solid rgba(168, 85, 247, 0.3);
    border-radius: 20px;
    padding: 2.5rem;
    max-width: 600px;
    width: 100%;
    position: relative;
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 2rem;
    cursor: pointer;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.modal-close:hover {
    background: rgba(168, 85, 247, 0.2);
    transform: rotate(90deg);
}

.modal-content h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--accent-purple);
}

.modal-content h3 {
    font-size: 1.5rem;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--accent-cyan);
}

.modal-content p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.modal-content ul {
    list-style: none;
}

.modal-content li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
}

.modal-content strong {
    color: var(--accent-purple);
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #0a0e27 0%, #1a1f3a 50%, #0f1729 100%);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loading-content {
    text-align: center;
}

.loader {
    width: 100px;
    height: 100px;
    position: relative;
    margin: 0 auto 2rem;
}

.orbit {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 2px solid transparent;
    border-top-color: var(--accent-purple);
    border-radius: 50%;
    animation: orbit 1.5s linear infinite;
}

.orbit:nth-child(2) {
    width: 70%;
    height: 70%;
    top: 15%;
    left: 15%;
    border-top-color: var(--accent-blue);
    animation-duration: 2s;
}

.orbit:nth-child(3) {
    width: 40%;
    height: 40%;
    top: 30%;
    left: 30%;
    border-top-color: var(--accent-cyan);
    animation-duration: 2.5s;
}

.loading-text {
    font-size: 1.25rem;
    color: var(--text-secondary);
    animation: pulse 2s ease-in-out infinite;
}

/* Animations */
@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

@keyframes pulse-glow {
    0%, 100% {
        filter: drop-shadow(0 0 20px var(--glow-purple));
    }
    50% {
        filter: drop-shadow(0 0 40px var(--glow-cyan));
    }
}

@keyframes bounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(-10px);
    }
}

@keyframes scroll-wheel {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
}

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

@keyframes pulse {
    0%, 100% {
        opacity: 0.7;
    }
    50% {
        opacity: 1;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Fade in animations for page elements */
.hero-content {
    animation: fadeIn 1s ease-out;
}

.controls-overlay {
    animation: slideInRight 0.8s ease-out 0.5s backwards;
}

.planet-nav {
    animation: slideInLeft 0.8s ease-out 0.7s backwards;
}

.orbit-control {
    animation: slideInRight 0.8s ease-out 0.9s backwards;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(10, 14, 39, 0.5);
}

::-webkit-scrollbar-thumb {
    background: rgba(168, 85, 247, 0.5);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-purple);
}

/* Accessibility - Focus Indicators */
*:focus {
    outline: 3px solid var(--accent-cyan);
    outline-offset: 2px;
}

*:focus:not(:focus-visible) {
    outline: none;
}

*:focus-visible {
    outline: 3px solid var(--accent-cyan);
    outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
select:focus-visible,
input:focus-visible {
    outline: 3px solid var(--accent-cyan);
    outline-offset: 2px;
    box-shadow: 0 0 0 6px rgba(6, 182, 212, 0.2);
}

.btn-icon:focus-visible {
    background: rgba(168, 85, 247, 0.3);
    transform: scale(1.05);
}

.planet-nav-item:focus-visible {
    background: rgba(168, 85, 247, 0.3);
    transform: translateX(8px);
}

.camera-preset-btn:focus-visible,
.toggle-trails-btn:focus-visible,
.orbit-control-btn:focus-visible {
    transform: scale(1.05);
}

#solar-system-container:focus-visible {
    outline: 3px solid var(--accent-cyan);
    outline-offset: -3px;
}

/* Skip to main content link for keyboard users */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--accent-purple);
    color: white;
    padding: 8px;
    text-decoration: none;
    z-index: 1000;
}

.skip-link:focus {
    top: 0;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .btn-icon,
    .btn-primary,
    .system-dropdown,
    button {
        border-width: 2px;
    }

    .planet-nav-item:hover,
    .planet-nav-item:focus {
        background: rgba(168, 85, 247, 0.5);
        border: 2px solid var(--accent-purple);
    }

    *:focus-visible {
        outline-width: 4px;
        outline-offset: 3px;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .hero-content,
    .controls-overlay,
    .planet-nav,
    .orbit-control,
    .camera-controls,
    .time-controls {
        animation: none !important;
    }
}

/* Screen Reader Only Class */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 3rem;
    }

    .nav {
        padding: 1rem 1.5rem;
        flex-wrap: wrap;
        gap: 1rem;
    }

    .nav-center {
        position: relative;
        left: auto;
        transform: none;
        width: 100%;
        order: 3;
        margin-top: 0.5rem;
    }

    .solar-system-selector {
        width: 100%;
        justify-content: center;
        padding: 0.6rem 1rem;
    }

    .selector-label {
        font-size: 0.85rem;
    }

    .system-dropdown {
        min-width: 160px;
        padding: 0.4rem 0.8rem;
        font-size: 0.9rem;
    }

    .planet-panel {
        width: calc(100% - 2rem);
        right: 1rem;
        left: 1rem;
        max-height: 70vh;
    }

    .moon-panel {
        width: calc(100% - 2rem);
        right: 1rem;
        left: 1rem;
        top: auto;
        bottom: 2rem;
        transform: translateY(0);
        max-height: 50vh;
    }

    .moon-panel.hidden {
        transform: translateY(500px);
    }

    .controls-overlay {
        flex-direction: column;
        gap: 0.5rem;
        padding: 1rem;
    }

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

    .planet-nav {
        left: 1rem;
        bottom: 6rem;
        top: auto;
        transform: none;
    }

    .planet-nav-menu {
        bottom: auto;
        top: calc(100% + 1rem);
    }

    .orbit-control {
        right: 1rem;
        bottom: 6rem;
    }

    .camera-controls {
        right: 1rem;
        bottom: 32rem;
        padding: 0.75rem;
    }

    .camera-controls-header {
        font-size: 0.8rem;
        margin-bottom: 0.5rem;
    }

    .camera-preset-btn {
        min-width: 50px;
        padding: 0.4rem 0.6rem;
        font-size: 1rem;
    }

    .camera-preset-btn .btn-label {
        font-size: 0.65rem;
    }

    .time-controls {
        right: 1rem;
        bottom: 19rem;
        padding: 0.75rem;
        min-width: 200px;
    }

    .time-controls-header {
        font-size: 0.8rem;
        margin-bottom: 0.5rem;
    }

    .speed-label {
        font-size: 0.7rem;
    }

    .toggle-trails-btn {
        padding: 0.5rem;
        font-size: 0.9rem;
    }

    .controls-overlay {
        bottom: 1rem;
        left: 50%;
        transform: translateX(-50%);
    }

    .control-hint span:not(.hint-icon) {
        display: none;
    }
}

/* Moon Explorer Panel */
.moon-panel {
    max-width: 400px;
    right: auto;
    left: 2rem;
}

.moon-subtitle {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.moon-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    max-height: 400px;
    overflow-y: auto;
    padding-right: 0.5rem;
}

.moon-item {
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
    cursor: pointer;
}

.moon-item:hover {
    background: var(--control-bg);
    border-color: var(--accent-purple);
    transform: translateX(5px);
}

.moon-item-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
}

.moon-item-info {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.moon-explorer-buttons {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

.btn-secondary {
    background: var(--secondary-bg);
    border: 2px solid var(--accent-cyan);
    color: var(--text-primary);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background: var(--accent-cyan);
    color: white;
    box-shadow: 0 6px 20px rgba(6, 182, 212, 0.3);
}

/* Comparison Modal */
.modal-wide {
    max-width: 900px;
    width: 90%;
}

.comparison-selectors {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.planet-selector {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
    min-width: 200px;
}

.planet-selector label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.planet-select {
    background: var(--control-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem;
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.planet-select:hover,
.planet-select:focus {
    border-color: var(--accent-purple);
    outline: none;
}

.comparison-vs {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent-purple);
    text-shadow: 0 0 10px var(--glow-purple);
}

.comparison-results {
    margin-top: 2rem;
}

.comparison-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.comparison-column {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.comparison-planet-name {
    text-align: center;
    color: var(--accent-purple);
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.comparison-stats {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.comparison-stat {
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.comparison-stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.comparison-stat-value {
    font-size: 1.1rem;
    color: var(--text-primary);
    font-weight: 700;
}

.comparison-divider {
    width: 2px;
    background: linear-gradient(to bottom,
        transparent,
        var(--accent-purple) 20%,
        var(--accent-purple) 80%,
        transparent
    );
}

.comparison-visual {
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
}

.comparison-visual h3 {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.size-comparison {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 3rem;
    min-height: 200px;
    padding: 1rem;
}

.size-comparison-planet {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.size-comparison-circle {
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
    box-shadow: 0 4px 20px var(--glow-purple);
    transition: all 0.5s ease;
}

.size-comparison-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 600;
}

/* Responsive Comparison Modal */
@media (max-width: 768px) {
    .comparison-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .comparison-divider {
        display: none;
    }

    .comparison-selectors {
        flex-direction: column;
        gap: 1rem;
    }

    .planet-selector {
        width: 100%;
    }
}