/* ═══════════════════════════════════════
   VARIABILI & RESET
   ═══════════════════════════════════════ */

:root {
    --bg-space: #0a0e27;
    --accent-primary: #961114;
    --accent-glow: rgba(150, 17, 20, 0.5);
    --text-primary: #e8f4f8;
    --text-secondary: #a0b8c8;
    --panel-bg: rgba(10, 14, 39, 0.92);
    --control-bg: rgba(20, 25, 45, 0.85);
    --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

body.light-theme {
    --bg-space: #e8f0f8;
    --text-primary: #1a1a2e;
    --text-secondary: #4a5568;
    --panel-bg: rgba(255, 255, 255, 0.92);
    --control-bg: rgba(240, 245, 250, 0.95);
}

body.light-theme {
    background-image: 
        radial-gradient(1px 1px at 20% 30%, rgba(0,0,0,0.1), transparent),
        radial-gradient(1px 1px at 60% 70%, rgba(0,0,0,0.1), transparent),
        radial-gradient(1px 1px at 50% 50%, rgba(0,0,0,0.1), transparent);
}

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

body {
    font-family: var(--font-main);
    background: var(--bg-space);
    color: var(--text-primary);
    overflow: hidden;
    /* Starfield background */
    background-image: 
        radial-gradient(2px 2px at 20% 30%, white, transparent),
        radial-gradient(2px 2px at 60% 70%, white, transparent),
        radial-gradient(1px 1px at 50% 50%, white, transparent),
        radial-gradient(1px 1px at 80% 10%, white, transparent),
        radial-gradient(2px 2px at 90% 60%, white, transparent),
        radial-gradient(1px 1px at 33% 80%, white, transparent);
    background-size: 200% 200%;
    background-position: 0% 0%;
    animation: starsMove 200s linear infinite;
}

@keyframes starsMove {
    0% { background-position: 0% 0%; }
    100% { background-position: 100% 100%; }
}

/* ═══════════════════════════════════════
   NAVBAR
   ═══════════════════════════════════════ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(10, 14, 39, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.navbar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    max-width: 1920px;
    margin: 0 auto;
}

.navbar-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    height: 40px;
    width: auto;
}

.logo-text {
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--text-primary);
}

.navbar-controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--control-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: var(--text-primary);
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.nav-btn:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.speed-control {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--control-bg);
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

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

#speedSlider {
    width: 150px;
    height: 4px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

#speedSlider::-webkit-slider-thumb {
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--accent-primary);
    border-radius: 50%;
    cursor: pointer;
}

#speedSlider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--accent-primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

#speedValue {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--accent-primary);
    min-width: 50px;
    text-align: right;
}

.theme-toggle {
    background: var(--control-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-primary);
    transition: all 0.2s;
    position: relative;
}

.theme-toggle:hover {
    background: var(--accent-primary);
    transform: rotate(180deg);
}

.sun-icon, .moon-icon {
    position: absolute;
    transition: opacity 0.2s, transform 0.2s;
}

.sun-icon {
    opacity: 0;
    transform: rotate(-90deg);
}

.moon-icon {
    opacity: 1;
    transform: rotate(0);
}

body.light-theme .sun-icon {
    opacity: 1;
    transform: rotate(0);
}

body.light-theme .moon-icon {
    opacity: 0;
    transform: rotate(90deg);
}

/* ═══════════════════════════════════════
   CANVAS CONTAINER
   ═══════════════════════════════════════ */

#canvasContainer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

/* ═══════════════════════════════════════
   BOTTOM CONTROLS
   ═══════════════════════════════════════ */

.bottom-controls {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    display: flex;
    gap: 1rem;
    background: var(--panel-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 1rem 1.5rem;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.control-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.2s;
    font-size: 0.75rem;
    font-weight: 600;
}

.control-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.control-btn.active {
    background: var(--accent-primary);
    color: #fff;
}

/* ═══════════════════════════════════════
   INFO PANEL
   ═══════════════════════════════════════ */

.info-panel {
    position: fixed;
    top: 0;
    right: -450px;
    width: 450px;
    height: 100%;
    background: var(--panel-bg);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border-left: 1px solid rgba(255, 255, 255, 0.1);
    z-index: 50;
    transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-y: auto;
    padding: 2rem;
}

.info-panel.visible {
    right: 0;
}

.info-panel::-webkit-scrollbar {
    width: 8px;
}

.info-panel::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
}

.info-panel::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
}

.close-btn {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.2s;
}

.close-btn:hover {
    background: var(--accent-primary);
}

.planet-preview {
    width: 100%;
    height: 250px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    margin-bottom: 1.5rem;
    overflow: hidden;
}

.planet-name {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.planet-type {
    font-size: 0.9rem;
    color: var(--accent-primary);
    font-weight: 600;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.info-section {
    margin-bottom: 1.5rem;
}

.info-section h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    border-bottom: 2px solid var(--accent-primary);
    padding-bottom: 0.5rem;
}

.info-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255, 255, 255, 0.05);
    padding: 0.75rem 1rem;
    border-radius: 8px;
}

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

.info-value {
    font-size: 0.9rem;
    color: var(--text-primary);
    font-weight: 700;
}

.satellites-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.satellite-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 6px;
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.satellite-btn:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.fun-facts {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.fun-facts li {
    padding-left: 1.5rem;
    position: relative;
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--text-secondary);
}

.fun-facts li::before {
    content: '🌟';
    position: absolute;
    left: 0;
}

/* ═══════════════════════════════════════
   LOADING SCREEN
   ═══════════════════════════════════════ */

.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-space);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.5s, visibility 0.5s;
}

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

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

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-content p {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* ═══════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════ */

@media (max-width: 1024px) {
    .info-panel {
        width: 350px;
        right: -350px;
    }
    
    .navbar-container {
        padding: 0.75rem 1rem;
    }
    
    .speed-control {
        display: none;
    }
}

@media (max-width: 768px) {
    .info-panel {
        width: 100%;
        right: -100%;
    }
    
    .navbar-logo span {
        display: none;
    }
    
    .bottom-controls {
        flex-wrap: wrap;
        padding: 0.75rem 1rem;
    }
    
    .control-btn span {
        display: none;
    }
}

/* Tablet */
@media (max-width: 1024px) {
    .info-panel {
        width: 380px;
        right: -380px;
    }
    
    .navbar-controls {
        gap: 0.75rem;
    }
}

/* Mobile Large */
@media (max-width: 768px) {
    .navbar-container {
        padding: 0.75rem 1rem;
    }
    
    .navbar-logo .logo-text {
        font-size: 1.1rem;
    }
    
    .logo-icon {
        height: 32px;
    }
    
    .navbar-controls {
        gap: 0.5rem;
        flex-wrap: wrap;
    }
    
    .nav-btn {
        padding: 0.5rem 0.8rem;
        font-size: 0.8rem;
    }
    
    .nav-btn svg {
        width: 14px;
        height: 14px;
    }
    
    .speed-control {
        order: 3;
        width: 100%;
        margin-top: 0.5rem;
    }
    
    /* Info Panel Full Width */
    .info-panel {
        width: 100%;
        right: -100%;
        padding: 1.5rem;
    }
    
    .planet-preview {
        height: 200px;
    }
    
    .planet-name {
        font-size: 1.5rem;
    }
    
    .info-section h3 {
        font-size: 1rem;
    }
    
    /* Bottom Controls */
    .bottom-controls {
        bottom: 1rem;
        left: 1rem;
        right: 1rem;
        transform: none;
        padding: 0.75rem 1rem;
        gap: 0.75rem;
    }
    
    .control-btn {
        padding: 0.5rem 0.8rem;
        font-size: 0.75rem;
        flex: 1;
    }
}

/* Mobile Small */
@media (max-width: 480px) {
    .navbar-logo .logo-text {
        display: none;
    }
    
    .nav-btn span {
        display: none;
    }
    
    .nav-btn {
        padding: 0.5rem;
        min-width: 40px;
    }
    
    .theme-toggle {
        width: 36px;
        height: 36px;
    }
    
    .speed-control label {
        font-size: 0.75rem;
    }
    
    #speedSlider {
        width: 120px;
    }
    
    #speedValue {
        font-size: 0.8rem;
        min-width: 40px;
    }
    
    /* Bottom Controls - Icons only */
    .control-btn span {
        display: none;
    }
    
    .control-btn {
        min-width: 50px;
        padding: 0.6rem;
    }
    
    /* Info Panel */
    .info-panel {
        padding: 1rem;
    }
    
    .close-btn {
        width: 32px;
        height: 32px;
        top: 1rem;
        right: 1rem;
    }
    
    .info-grid {
        gap: 0.5rem;
    }
    
    .info-item {
        padding: 0.6rem 0.8rem;
        font-size: 0.85rem;
    }
    
    .fun-facts li {
        font-size: 0.85rem;
    }
}

/* Landscape Mobile */
@media (max-height: 500px) and (orientation: landscape) {
    .navbar {
        position: relative;
        height: auto;
    }
    
    .navbar-container {
        padding: 0.5rem 1rem;
    }
    
    .bottom-controls {
        bottom: 0.5rem;
        padding: 0.5rem;
        gap: 0.5rem;
    }
    
    .control-btn {
        padding: 0.4rem 0.6rem;
        font-size: 0.7rem;
    }
    
    .info-panel {
        width: 60%;
        height: 100vh;
        top: 0;
    }
}

/* Touch Optimizations */
@media (hover: none) and (pointer: coarse) {
    .nav-btn,
    .control-btn,
    .satellite-btn,
    .close-btn,
    .theme-toggle {
        min-height: 44px;
        min-width: 44px;
    }
    
    /* Larger slider thumb for touch */
    #speedSlider::-webkit-slider-thumb {
        width: 20px;
        height: 20px;
    }
    
    #speedSlider::-moz-range-thumb {
        width: 20px;
        height: 20px;
    }
}

/* Prevent canvas overflow */
#canvasContainer {
    position: fixed;
    overflow: hidden;
    -webkit-overflow-scrolling: touch;
}

#canvasContainer canvas {
    display: block;
    max-width: 100vw;
    max-height: 100vh;
}