/* ==========================================
   Styles for Solar System Scale Model
   ========================================== */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: #e0e0e0;
    line-height: 1.6;
    min-height: 100vh;
}

/* ==========================================
   Header & Navigation
   ========================================== */

header {
    background: rgba(0, 0, 0, 0.8);
    border-bottom: 3px solid #ffd700;
    padding: 2rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.5);
    transition: transform 0.3s ease-in-out, opacity 0.3s ease-in-out;
}

header.hidden {
    transform: translateY(-100%);
    opacity: 0;
}

header h1 {
    text-align: center;
    color: #ffd700;
    font-size: 2.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.8);
    margin-bottom: 0.5rem;
}

header p {
    text-align: center;
    font-size: 1rem;
    color: #b0b0b0;
}

nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1rem;
}

nav a {
    color: #ffd700;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: all 0.3s ease;
    font-weight: 500;
}

nav a:hover {
    background: #ffd700;
    color: #1a1a2e;
    transform: scale(1.05);
}

/* ==========================================
   Main Container
   ========================================== */

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

section {
    margin-bottom: 3rem;
}

/* ==========================================
   Hero Section (Index Page)
   ========================================== */

.hero {
    text-align: center;
    padding: 3rem 1rem;
    background: rgba(255, 215, 0, 0.05);
    border-radius: 8px;
    margin-bottom: 3rem;
    border: 1px solid rgba(255, 215, 0, 0.2);
}

.hero h2 {
    font-size: 2rem;
    color: #ffd700;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.1rem;
    color: #d0d0d0;
    max-width: 800px;
    margin: 0 auto;
}

/* ==========================================
   Planet Grid (Index Page)
   ========================================== */

.planets-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
    max-width: 1200px;
}

.planets-grid section:has(> .planets-grid) .planets-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 280px));
}

.planet-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 215, 0, 0.3);
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    max-width: 280px;
    margin: 0 auto;
}

.planet-card:hover {
    transform: translateY(-8px);
    border-color: #ffd700;
    box-shadow: 0 8px 16px rgba(255, 215, 0, 0.2);
}

.planet-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
}

.planet-card-content {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.planet-card h3 {
    color: #ffd700;
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.planet-card p {
    font-size: 0.95rem;
    color: #b0b0b0;
    flex-grow: 1;
}

/* ==========================================
   Planet Detail Page
   ========================================== */

.planet-header {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-bottom: 3rem;
    align-items: center;
}

@media (min-width: 768px) {
    .planet-header {
        flex-direction: row;
        align-items: flex-start;
    }
}

.planet-image {
    flex: 1;
    max-width: 400px;
    width: 100%;
}

.planet-image img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.5);
    border: 2px solid rgba(255, 215, 0, 0.3);
}

.planet-info {
    flex: 1;
    padding: 0 1rem;
}

.planet-info h1 {
    color: #ffd700;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.8);
}

.planet-info p {
    color: #d0d0d0;
    font-size: 1.05rem;
    margin-bottom: 1rem;
    line-height: 1.8;
}

/* ==========================================
   Facts Section
   ========================================== */

.facts-section {
    background: rgba(255, 255, 255, 0.05);
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid #ffd700;
    margin-bottom: 2rem;
}

.facts-section h2 {
    color: #ffd700;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.facts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.fact {
    background: rgba(0, 0, 0, 0.3);
    padding: 1.5rem;
    border-radius: 6px;
    border: 1px solid rgba(255, 215, 0, 0.2);
}

.fact-label {
    color: #ffd700;
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.fact-value {
    color: #e0e0e0;
    font-size: 1.2rem;
    font-weight: 500;
}

/* ==========================================
   Model Section
   ========================================== */

.model-section {
    background: rgba(100, 149, 237, 0.1);
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid #6495ed;
    margin-bottom: 2rem;
}

.model-section h2 {
    color: #6495ed;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.model-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.model-detail {
    background: rgba(0, 0, 0, 0.3);
    padding: 1.5rem;
    border-radius: 6px;
    border: 1px solid rgba(100, 149, 237, 0.3);
}

.model-detail h3 {
    color: #6495ed;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    text-transform: uppercase;
}

.model-value {
    color: #e0e0e0;
    font-size: 1.3rem;
    font-weight: 500;
}

.color-box {
    display: inline-block;
    width: 20px;
    height: 20px;
    border-radius: 4px;
    border: 1px solid #999;
    margin-right: 0.5rem;
    vertical-align: middle;
}

/* ==========================================
   Tables
   ========================================== */

table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

table thead {
    background: rgba(255, 215, 0, 0.15);
}

table th {
    background: rgba(255, 215, 0, 0.2);
    color: #ffd700;
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    border-bottom: 2px solid rgba(255, 215, 0, 0.4);
}

table td {
    padding: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    color: #e0e0e0;
}

table tr:hover {
    background: rgba(255, 215, 0, 0.05);
}

table tr:last-child td {
    border-bottom: none;
}

/* ==========================================
   Moons Section
   ========================================== */

.moons-section {
    margin-top: 2rem;
}

.moons-section h2 {
    color: #ffd700;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    margin-top: 2rem;
}

.moons-section h3 {
    color: #b0b0b0;
    font-size: 1.1rem;
    margin-top: 1.5rem;
    margin-bottom: 1rem;
}

.moons-table {
    margin-bottom: 2rem;
}

/* ==========================================
   Footer
   ========================================== */

footer {
    background: rgba(0, 0, 0, 0.8);
    border-top: 2px solid #ffd700;
    padding: 2rem;
    margin-top: 4rem;
    text-align: center;
}

footer p {
    color: #b0b0b0;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

footer a {
    color: #ffd700;
    text-decoration: none;
    transition: color 0.3s ease;
}

footer a:hover {
    color: #ffed4e;
    text-decoration: underline;
}

/* ==========================================
   Links
   ========================================== */

a {
    color: #ffd700;
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #ffed4e;
    text-decoration: underline;
}

/* ==========================================
   Back to Index Link
   ========================================== */

.back-link {
    display: inline-block;
    margin-bottom: 2rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 215, 0, 0.1);
    border: 1px solid rgba(255, 215, 0, 0.3);
    border-radius: 4px;
    transition: all 0.3s ease;
}

.back-link:hover {
    background: rgba(255, 215, 0, 0.2);
    border-color: #ffd700;
    transform: translateX(-4px);
}

/* ==========================================
   Responsive Design
   ========================================== */

@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }

    main {
        padding: 1rem;
    }

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

    .model-info {
        grid-template-columns: 1fr;
    }

    .planet-header {
        flex-direction: column;
    }

    .planet-info {
        padding: 0;
    }

    table {
        font-size: 0.9rem;
    }

    table th,
    table td {
        padding: 0.75rem 0.5rem;
    }

    nav {
        gap: 0.5rem;
    }

    nav a {
        padding: 0.4rem 0.8rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }

    header p {
        font-size: 0.9rem;
    }

    main {
        padding: 0.5rem;
    }

    .planet-info h1 {
        font-size: 1.8rem;
    }

    .fact-value {
        font-size: 1rem;
    }

    .model-value {
        font-size: 1.1rem;
    }
}