/* ========================================
   COSMOS - Immersive Universe Experience
   Design System & Styles
   ======================================== */

/* CSS Custom Properties */
:root {
    /* Colors - Deep Space Palette */
    --color-void: #000000;
    --color-deep-space: #0a0a14;
    --color-nebula-purple: #6b4c9a;
    --color-nebula-blue: #4a7fb5;
    --color-nebula-pink: #c77dbb;
    --color-nebula-cyan: #5ecfd9;
    --color-star-white: #ffffff;
    --color-star-blue: #aaccff;
    --color-star-yellow: #fff4d4;
    --color-star-orange: #ffcc88;
    --color-star-red: #ff9988;
    
    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-shadow: rgba(0, 0, 0, 0.5);
    
    /* Typography */
    --font-display: 'Outfit', sans-serif;
    --font-mono: 'Space Mono', monospace;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
    --transition-cosmic: 1000ms cubic-bezier(0.23, 1, 0.32, 1);
}

/* Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--color-void);
    font-family: var(--font-display);
    color: var(--color-star-white);
    cursor: grab;
}

body:active {
    cursor: grabbing;
}

/* Canvas */
#cosmos {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

/* ========================================
   Loading Screen
   ======================================== */
#loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-void);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity var(--transition-cosmic), visibility var(--transition-cosmic);
}

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

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

.loading-logo {
    font-size: 4rem;
    animation: pulse-glow 2s ease-in-out infinite;
    margin-bottom: var(--space-lg);
}

@keyframes pulse-glow {
    0%, 100% {
        text-shadow: 0 0 20px rgba(255, 255, 255, 0.5),
                     0 0 40px rgba(107, 76, 154, 0.5);
        opacity: 0.7;
    }
    50% {
        text-shadow: 0 0 40px rgba(255, 255, 255, 0.8),
                     0 0 80px rgba(107, 76, 154, 0.8);
        opacity: 1;
    }
}

.loading-content h1 {
    font-family: var(--font-display);
    font-weight: 200;
    font-size: 2.5rem;
    letter-spacing: 1rem;
    margin-bottom: var(--space-md);
    background: linear-gradient(135deg, var(--color-star-white), var(--color-nebula-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.loading-content p {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.5);
    font-weight: 300;
    margin-bottom: var(--space-lg);
    letter-spacing: 0.1rem;
}

.loading-bar {
    width: 200px;
    height: 2px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 1px;
    overflow: hidden;
    margin: 0 auto;
}

.loading-progress {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--color-nebula-purple), var(--color-nebula-cyan));
    border-radius: 1px;
    animation: loading-animation 2s ease-in-out forwards;
}

@keyframes loading-animation {
    0% { width: 0%; }
    50% { width: 70%; }
    100% { width: 100%; }
}

/* ========================================
   UI Overlay
   ======================================== */
#ui-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
    pointer-events: none;
    padding: var(--space-xl);
}

.ui-corner {
    position: absolute;
    pointer-events: auto;
}

.top-left {
    top: var(--space-xl);
    left: var(--space-xl);
}

.top-right {
    top: var(--space-xl);
    right: var(--space-xl);
}

.bottom-left {
    bottom: var(--space-xl);
    left: var(--space-xl);
}

.bottom-right {
    bottom: var(--space-xl);
    right: var(--space-xl);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    align-items: flex-end;
}

/* Glass Effect */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    box-shadow: 0 8px 32px var(--glass-shadow);
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    opacity: 0;
    animation: fade-in 1s var(--transition-cosmic) 2s forwards;
}

.logo-symbol {
    font-size: 1.5rem;
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.5);
}

.logo-text {
    font-family: var(--font-display);
    font-weight: 200;
    font-size: 1rem;
    letter-spacing: 0.5rem;
    color: rgba(255, 255, 255, 0.8);
}

@keyframes fade-in {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Stats Panel */
.stats-panel {
    padding: var(--space-md) var(--space-lg);
    display: flex;
    gap: var(--space-xl);
    opacity: 0;
    animation: fade-in 1s var(--transition-cosmic) 2.2s forwards;
}

.stat {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.stat-label {
    font-size: 0.625rem;
    text-transform: uppercase;
    letter-spacing: 0.15rem;
    color: rgba(255, 255, 255, 0.4);
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 1.125rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-star-white), var(--color-nebula-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Controls Panel */
.controls-panel {
    padding: var(--space-md) var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    opacity: 0;
    animation: fade-in 1s var(--transition-cosmic) 2.4s forwards;
}

.control-hint {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.5);
}

kbd {
    font-family: var(--font-mono);
    font-size: 0.625rem;
    padding: var(--space-xs) var(--space-sm);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 4px;
    color: rgba(255, 255, 255, 0.7);
}

/* Glass Button */
.glass-button {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: rgba(255, 255, 255, 0.7);
    font-family: var(--font-display);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    opacity: 0;
    animation: fade-in 1s var(--transition-cosmic) 2.6s forwards;
}

.glass-button:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    color: var(--color-star-white);
    transform: translateY(-2px);
}

.glass-button.active {
    background: rgba(94, 207, 217, 0.15);
    border-color: rgba(94, 207, 217, 0.4);
    color: var(--color-nebula-cyan);
}

.glass-button.warp {
    background: rgba(107, 76, 154, 0.1);
}

.glass-button.warp:hover {
    background: rgba(107, 76, 154, 0.25);
    border-color: rgba(199, 125, 187, 0.5);
    color: var(--color-nebula-pink);
    box-shadow: 0 0 30px rgba(199, 125, 187, 0.3);
}

.glass-button.warp.active {
    animation: warp-pulse 0.5s ease-in-out infinite;
}

@keyframes warp-pulse {
    0%, 100% {
        box-shadow: 0 0 20px rgba(199, 125, 187, 0.3);
    }
    50% {
        box-shadow: 0 0 40px rgba(199, 125, 187, 0.6);
    }
}

/* Star Info Panel */
.star-info-panel {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    width: 90%;
    max-width: 500px;
    padding: var(--space-xl);
    pointer-events: auto;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.star-info-panel.visible {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

.star-info-panel.hidden {
    opacity: 0;
    visibility: hidden;
    transform: translate(-50%, -50%) scale(0.9);
}

.close-btn {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    width: 32px;
    height: 32px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: rgba(255, 255, 255, 0.5);
    font-size: 1.25rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.close-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-star-white);
}

.star-info-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.star-visual {
    display: flex;
    justify-content: center;
}

.star-preview {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--color-star-white) 0%, var(--color-star-yellow) 50%, transparent 70%);
    box-shadow: 0 0 60px var(--color-star-yellow),
                0 0 100px rgba(255, 244, 212, 0.5);
    animation: star-pulse 3s ease-in-out infinite;
}

@keyframes star-pulse {
    0%, 100% { transform: scale(1); opacity: 0.9; }
    50% { transform: scale(1.1); opacity: 1; }
}

.star-details h2 {
    font-family: var(--font-display);
    font-weight: 300;
    font-size: 1.5rem;
    text-align: center;
    margin-bottom: var(--space-md);
    background: linear-gradient(135deg, var(--color-star-white), var(--color-nebula-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.star-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.star-stat {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    padding: var(--space-sm);
    background: rgba(255, 255, 255, 0.02);
    border-radius: 8px;
}

.star-stat .label {
    font-size: 0.625rem;
    text-transform: uppercase;
    letter-spacing: 0.1rem;
    color: rgba(255, 255, 255, 0.4);
}

.star-stat .value {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-star-white);
}

.star-description {
    font-size: 0.875rem;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.6);
    text-align: center;
    font-weight: 300;
}

/* Discovery Notification */
.discovery-notification {
    position: fixed;
    top: var(--space-xl);
    left: 50%;
    transform: translateX(-50%) translateY(-100px);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: rgba(107, 76, 154, 0.2);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(199, 125, 187, 0.3);
    border-radius: 50px;
    z-index: 100;
    pointer-events: none;
    transition: transform var(--transition-cosmic);
}

.discovery-notification.visible {
    transform: translateX(-50%) translateY(0);
}

.discovery-icon {
    font-size: 1.5rem;
    animation: sparkle 1s ease-in-out infinite;
}

@keyframes sparkle {
    0%, 100% { transform: scale(1) rotate(0deg); }
    50% { transform: scale(1.2) rotate(10deg); }
}

.discovery-text {
    display: flex;
    flex-direction: column;
}

.discovery-label {
    font-size: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.15rem;
    color: rgba(199, 125, 187, 0.8);
}

.discovery-name {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 400;
    color: var(--color-star-white);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    #ui-overlay {
        padding: var(--space-md);
    }
    
    .ui-corner {
        position: absolute;
    }
    
    .top-left { top: var(--space-md); left: var(--space-md); }
    .top-right { top: var(--space-md); right: var(--space-md); }
    .bottom-left { bottom: var(--space-md); left: var(--space-md); }
    .bottom-right { bottom: var(--space-md); right: var(--space-md); }
    
    .stats-panel {
        flex-direction: column;
        gap: var(--space-sm);
        padding: var(--space-sm) var(--space-md);
    }
    
    .controls-panel {
        display: none;
    }
    
    .star-info-panel {
        padding: var(--space-lg);
    }
    
    .glass-button {
        padding: var(--space-xs) var(--space-sm);
        font-size: 0.625rem;
    }
}

/* ========================================
   Animations & Effects
   ======================================== */
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* Selection */
::selection {
    background: rgba(107, 76, 154, 0.5);
    color: var(--color-star-white);
}

/* Scrollbar (hidden but functional) */
::-webkit-scrollbar {
    width: 0;
    height: 0;
}