/* ========================================
   COSMOS - NASA 우주 갤러리
   Custom Styles
======================================== */

/* CSS Variables */
:root {
    /* Colors */
    --color-bg-primary: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-bg-card: rgba(20, 20, 35, 0.8);
    --color-bg-glass: rgba(255, 255, 255, 0.03);
    
    --color-accent-primary: #6366f1;
    --color-accent-secondary: #8b5cf6;
    --color-accent-tertiary: #06b6d4;
    --color-accent-glow: #818cf8;
    
    --color-text-primary: #f8fafc;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    
    --color-border: rgba(99, 102, 241, 0.2);
    --color-border-hover: rgba(99, 102, 241, 0.5);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #06b6d4 100%);
    --gradient-bg: radial-gradient(ellipse at top, #1a1a2e 0%, #0a0a0f 50%, #000 100%);
    --gradient-card: linear-gradient(180deg, rgba(99, 102, 241, 0.1) 0%, transparent 100%);
    
    /* Typography */
    --font-display: 'Orbitron', sans-serif;
    --font-body: 'Rajdhani', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.3);
    --shadow-card: 0 10px 40px rgba(0, 0, 0, 0.5);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
    background-image: var(--gradient-bg);
    min-height: 100vh;
    overflow-x: hidden;
}

/* 사이트 네비게이션 스타일은 style.css에서 관리 */

a {
    text-decoration: none;
    color: inherit;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ========================================
   Stars Animation Background
======================================== */
.stars-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.stars, .stars2, .stars3 {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-repeat: repeat;
}

.stars {
    background-image: 
        radial-gradient(2px 2px at 20px 30px, #fff, transparent),
        radial-gradient(2px 2px at 40px 70px, rgba(255,255,255,0.8), transparent),
        radial-gradient(1px 1px at 90px 40px, #fff, transparent),
        radial-gradient(2px 2px at 160px 120px, rgba(255,255,255,0.9), transparent),
        radial-gradient(1px 1px at 230px 80px, #fff, transparent),
        radial-gradient(2px 2px at 300px 150px, rgba(255,255,255,0.7), transparent),
        radial-gradient(1px 1px at 350px 200px, #fff, transparent),
        radial-gradient(2px 2px at 420px 60px, rgba(255,255,255,0.8), transparent);
    background-size: 500px 300px;
    animation: twinkle 8s ease-in-out infinite;
}

.stars2 {
    background-image: 
        radial-gradient(1px 1px at 50px 100px, rgba(255,255,255,0.6), transparent),
        radial-gradient(2px 2px at 100px 150px, rgba(255,255,255,0.5), transparent),
        radial-gradient(1px 1px at 200px 50px, rgba(255,255,255,0.7), transparent),
        radial-gradient(1px 1px at 280px 180px, rgba(255,255,255,0.4), transparent),
        radial-gradient(2px 2px at 380px 100px, rgba(255,255,255,0.6), transparent);
    background-size: 450px 250px;
    animation: twinkle 12s ease-in-out infinite;
    animation-delay: -3s;
}

.stars3 {
    background-image: 
        radial-gradient(1px 1px at 80px 200px, rgba(139, 92, 246, 0.8), transparent),
        radial-gradient(2px 2px at 180px 100px, rgba(99, 102, 241, 0.6), transparent),
        radial-gradient(1px 1px at 320px 250px, rgba(6, 182, 212, 0.7), transparent),
        radial-gradient(2px 2px at 450px 150px, rgba(139, 92, 246, 0.5), transparent);
    background-size: 550px 350px;
    animation: twinkle 15s ease-in-out infinite;
    animation-delay: -5s;
}

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

/* ========================================
   Header (사이트 네비게이션 사용으로 비활성화)
======================================== */
/* .header 스타일은 사이트 네비게이션(nav.js)이 처리합니다 */
.nasa-page-header {
    position: fixed;
    top: 60px; /* 사이트 네비게이션 높이만큼 아래로 */
    left: 0;
    width: 100%;
    z-index: 999;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nasa-header-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
}

.nasa-nav-link {
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 1px;
    color: var(--color-text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
    position: relative;
    text-decoration: none;
}

.nasa-nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-normal);
}

.nasa-nav-link:hover,
.nasa-nav-link.active {
    color: var(--color-text-primary);
}

.nasa-nav-link:hover::after,
.nasa-nav-link.active::after {
    width: 80%;
}

/* ========================================
   Main Content
======================================== */
.main {
    position: relative;
    z-index: 1;
    padding-top: 100px; /* 네비게이션 + 페이지 헤더 높이 고려 */
}

.section {
    padding: var(--spacing-2xl) var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-title {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.title-accent {
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 8px;
    color: var(--color-accent-primary);
    text-transform: uppercase;
}

.title-main {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    letter-spacing: 2px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   Hero Section (Today's Picture)
======================================== */
.hero-section {
    min-height: calc(100vh - 80px);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-image-wrapper {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-bg-card);
    aspect-ratio: 16/10;
    box-shadow: var(--shadow-card);
}

.hero-image-link {
    display: block;
    width: 100%;
    height: 100%;
    position: relative;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.hero-image-link:hover .hero-image {
    transform: scale(1.05);
}

.image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    opacity: 0;
    transition: opacity var(--transition-normal);
    color: var(--color-text-primary);
    font-size: 1rem;
}

.hero-image-link:hover .image-overlay {
    opacity: 1;
}

.zoom-icon {
    font-size: 3rem;
}

.hero-video-wrapper {
    width: 100%;
    height: 100%;
}

.hero-video-wrapper iframe {
    width: 100%;
    height: 100%;
}

.hero-info {
    padding: var(--spacing-lg);
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    backdrop-filter: blur(10px);
}

.info-date {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-display);
    font-size: 0.9rem;
    color: var(--color-accent-tertiary);
    margin-bottom: var(--spacing-sm);
}

.info-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, #fff 0%, #94a3b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.info-description {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    max-height: 200px;
    overflow-y: auto;
    padding-right: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.info-description::-webkit-scrollbar {
    width: 4px;
}

.info-description::-webkit-scrollbar-track {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-full);
}

.info-description::-webkit-scrollbar-thumb {
    background: var(--color-accent-primary);
    border-radius: var(--radius-full);
}

.info-copyright {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    font-style: italic;
}

.info-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* ========================================
   Buttons
======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-display);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 1px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
    text-transform: uppercase;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-text-primary);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(99, 102, 241, 0.6);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-accent-primary);
    background: rgba(99, 102, 241, 0.1);
}

.btn-glow {
    background: var(--gradient-primary);
    color: var(--color-text-primary);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-glow);
    animation: pulse-glow 2s ease-in-out infinite;
}

.btn-glow:hover {
    transform: scale(1.05);
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 30px rgba(99, 102, 241, 0.3); }
    50% { box-shadow: 0 0 50px rgba(99, 102, 241, 0.6); }
}

/* ========================================
   Loading Spinner
======================================== */
.loading-spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    z-index: 10;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-sm);
}

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

.loading-spinner p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

/* ========================================
   Archive Section
======================================== */
.archive-controls {
    display: flex;
    justify-content: center;
    align-items: flex-end;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.date-picker-wrapper {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.date-label {
    font-family: var(--font-display);
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    letter-spacing: 1px;
}

.date-picker {
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--color-text-primary);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    outline: none;
    transition: border-color var(--transition-normal);
}

.date-picker:focus {
    border-color: var(--color-accent-primary);
}

.date-picker::-webkit-calendar-picker-indicator {
    filter: invert(1);
    cursor: pointer;
}

.archive-result {
    min-height: 300px;
    position: relative;
}

.archive-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    animation: fadeIn 0.5s ease;
}

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

.archive-card-image {
    position: relative;
    aspect-ratio: 16/10;
    overflow: hidden;
}

.archive-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.archive-card-image:hover img {
    transform: scale(1.05);
}

.archive-card-info {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.archive-card-date {
    font-family: var(--font-display);
    font-size: 0.85rem;
    color: var(--color-accent-tertiary);
    margin-bottom: var(--spacing-sm);
}

.archive-card-title {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.archive-card-desc {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    max-height: 150px;
    overflow-y: auto;
    margin-bottom: var(--spacing-md);
}

/* ========================================
   Random Section
======================================== */
.random-controls {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.random-gallery {
    position: relative;
    min-height: 400px;
}

.random-swiper {
    padding-bottom: 60px;
}

.random-swiper .swiper-slide {
    background: var(--color-bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
}

.random-swiper .swiper-slide:hover {
    border-color: var(--color-accent-primary);
    box-shadow: var(--shadow-glow);
}

.random-card {
    height: 100%;
}

.random-card-image {
    position: relative;
    aspect-ratio: 16/10;
    overflow: hidden;
}

.random-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.random-card:hover .random-card-image img {
    transform: scale(1.1);
}

.random-card-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: var(--spacing-lg);
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.9));
}

.random-card-date {
    font-family: var(--font-display);
    font-size: 0.75rem;
    color: var(--color-accent-tertiary);
    margin-bottom: var(--spacing-xs);
}

.random-card-title {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    line-height: 1.3;
}

/* Swiper Custom Styles */
.swiper-button-prev,
.swiper-button-next {
    color: var(--color-accent-primary);
    background: var(--color-bg-card);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
}

.swiper-button-prev::after,
.swiper-button-next::after {
    font-size: 1.2rem;
    font-weight: bold;
}

.swiper-button-prev:hover,
.swiper-button-next:hover {
    background: var(--color-accent-primary);
    color: var(--color-text-primary);
}

.swiper-pagination-bullet {
    background: var(--color-text-secondary);
    opacity: 0.5;
}

.swiper-pagination-bullet-active {
    background: var(--color-accent-primary);
    opacity: 1;
}

/* ========================================
   Recent Section
======================================== */
.recent-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    position: relative;
    min-height: 300px;
}

.recent-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
    animation: fadeIn 0.5s ease;
}

.recent-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent-primary);
    box-shadow: var(--shadow-glow);
}

.recent-card-image {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
}

.recent-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.recent-card:hover .recent-card-image img {
    transform: scale(1.1);
}

.recent-card-content {
    padding: var(--spacing-md);
}

.recent-card-date {
    font-family: var(--font-display);
    font-size: 0.75rem;
    color: var(--color-accent-tertiary);
    margin-bottom: var(--spacing-xs);
}

.recent-card-title {
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text-primary);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ========================================
   Footer
======================================== */
.footer {
    position: relative;
    z-index: 1;
    padding: var(--spacing-xl) var(--spacing-lg);
    background: rgba(10, 10, 15, 0.9);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-text {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.footer-text a {
    color: var(--color-accent-primary);
    transition: color var(--transition-fast);
}

.footer-text a:hover {
    color: var(--color-accent-secondary);
}

.footer-copyright {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* ========================================
   Toast Message
======================================== */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-accent-primary);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-glow);
    z-index: 9999;
    opacity: 0;
    transition: all var(--transition-normal);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast-message {
    font-size: 0.9rem;
    color: var(--color-text-primary);
}

/* ========================================
   Empty State
======================================== */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--color-text-secondary);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state-text {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
}

.empty-state .btn {
    margin-top: var(--spacing-md);
    display: inline-flex !important;
    visibility: visible !important;
    opacity: 1 !important;
}

/* ========================================
   Responsive Design
======================================== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
    }
    
    .hero-info {
        order: -1;
    }
    
    .archive-card {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .header-inner {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .nav {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .section {
        padding: var(--spacing-xl) var(--spacing-sm);
    }
    
    .title-main {
        font-size: 1.8rem;
    }
    
    .archive-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .info-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .recent-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   GLightbox Custom Styles
======================================== */
.glightbox-clean .gslide-description {
    background: var(--color-bg-card);
}

.glightbox-clean .gdesc-inner {
    padding: var(--spacing-lg);
}

.glightbox-clean .gslide-title {
    font-family: var(--font-display);
    color: var(--color-text-primary);
}

.glightbox-clean .gslide-desc {
    font-family: var(--font-body);
    color: var(--color-text-secondary);
}