/* Custom Properties (Variables) for easy theme management */

footer a {
  color: white !important;
}
:root {
    --bg-color: #080a0f;
    --card-bg-color: #121620;
    --header-bg-color: #0c1017;
    --nav-bg-color: #0d1117;
    --primary-color: #2ea043; /* NASA Green */
    --primary-color-hover: #37bd4f;
    --secondary-color: #007bff; /* Button Blue */
    --secondary-color-hover: #0056b3;
    --text-color-light: #e6e6e6;
    --text-color-dark: #c9d1d9;
    --text-color-secondary: #8b949e;
    --border-color: #2e3541;
    --shadow-light: 0 4px 15px rgba(0, 0, 0, 0.3);
    --shadow-heavy: 0 8px 30px rgba(0, 0, 0, 0.6);
}

/* Base Styles */
body {
    font-family: 'Open Sans', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color-dark);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background: radial-gradient(circle at center top, #1a202a, var(--bg-color) 75%);
}

/* Header & Navigation */
header {
    background-color: var(--header-bg-color);
    padding: 20px;
    text-align: center;
    border-bottom: 3px solid var(--primary-color);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
}

header h1 {
    margin: 10px 0 0;
    font-size: 2.8em;
    color: var(--text-color-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    letter-spacing: 1px;
    text-shadow: 0 0 10px rgba(46, 160, 67, 0.3);
}

.site-logo {
    height: 80px;
    margin-right: 20px;
    transition: transform 0.4s ease;
}

.site-logo:hover {
    transform: rotate(15deg) scale(1.1);
}

nav {
    background-color: var(--nav-bg-color);
    padding: 10px 0;
    border-bottom: 1px solid var(--primary-color);
}

.main-menu {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    gap: 25px;
}

.main-menu li a {
    text-decoration: none;
    color: var(--text-color-dark);
    font-size: 1.2em;
    font-weight: 500;
    padding: 8px 15px;
    border-radius: 5px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    position: relative;
    overflow: hidden;
}

.main-menu li a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--primary-color);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.main-menu li a:hover::before,
.main-menu li a.active::before {
    transform: scaleX(1);
}

.main-menu li a:hover,
.main-menu li a.active {
    color: white;
}

/* Main Content Area */
main {
    flex-grow: 1;
    max-width: 1100px;
    margin: 30px auto;
    padding: 30px;
    background-color: var(--card-bg-color);
    border-radius: 12px;
    box-shadow: var(--shadow-heavy);
    position: relative;
    border: 1px solid var(--border-color);
}

.page-title {
    font-size: 2.8em;
    color: var(--text-color-light);
    text-align: center;
    margin-bottom: 40px;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
    border-bottom: 2px solid rgba(46, 160, 67, 0.3);
    padding-bottom: 15px;
}

/* Home Page Specific Styles */
.home-content {
    text-align: center;
    color: var(--text-color-dark);
    font-size: 1.15em;
    line-height: 1.8;
}

.home-content p {
    margin-bottom: 20px;
}

.home-content h3 {
    font-size: 1.8em;
    color: var(--text-color-light);
    margin-top: 40px;
    margin-bottom: 25px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
    display: inline-block;
}

.home-content ul {
    list-style: none;
    padding: 0;
    margin-bottom: 30px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
}

.home-content ul li {
    background-color: #1a202a;
    border-radius: 12px;
    padding: 25px;
    box-shadow: var(--shadow-light);
    text-align: left;
    max-width: 450px;
    width: 100%;
    box-sizing: border-box;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--border-color);
}

.home-content ul li:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 10px 25px rgba(46, 160, 67, 0.2);
}

.home-content ul li i {
    font-size: 1.5em;
  color: #fff;
  margin-bottom: 15px;
  display: block;
  text-align: center;
  text-shadow: 0 0 10px rgba(46, 160, 67, 0.5);
}

.home-content ul li strong {
    font-size: 1.3em;
    color: var(--text-color-light);
    display: block;
    margin-bottom: 10px;
    text-align: center;
}

.home-image {
    max-width: 80%;
    height: auto;
    border-radius: 10px;
    margin-top: 40px;
    box-shadow: var(--shadow-heavy);
    border: 2px solid var(--border-color);
    transition: transform 0.4s ease;
}

.home-image:hover {
    transform: scale(1.02);
}

/* Controls (APOD & Rovers) */
.controls-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 15px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px dashed var(--border-color);
}

.date-controls, .rover-selection, .rover-date-selection, .camera-selection {
    display: flex;
    align-items: center;
    gap: 10px;
}

input[type="date"],
select,
.controls-container button,
.button {
    padding: 12px 20px;
    margin: 5px;
    border: none;
    border-radius: 8px;
    font-size: 1.05em;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    box-shadow: var(--shadow-light);
}

input[type="date"], select {
    background-color: var(--card-bg-color);
    color: var(--text-color-light);
    border: 1px solid var(--border-color);
    appearance: none;
    border-radius: 8px;
}
input[type="date"]::-webkit-calendar-picker-indicator {
    filter: invert(1);
    cursor: pointer;
}
select {
    padding-right: 30px;
    background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23e6e6e6%22%20d%3D%22M287%2C197.3L159.2%2C69.5c-3.6-3.6-9.5-3.6-13.1%2C0L5.4%2C197.3c-3.6%2C3.6-3.6%2C9.5%2C0%2C13.1s9.5%2C3.6%2C13.1%2C0l130.8-130.8L273.9%2C210.4c3.6%2C3.6%2C9.5%2C3.6%2C13.1%2C0C290.6%2C206.8%2C290.6%2C200.9%2C287%2C197.3z%22%2F%3E%3C%2Fsvg%3E');
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 12px;
}

.controls-container button,
.button {
    background-color: var(--primary-color);
    color: white;
}

.controls-container button:hover,
.button:hover {
    background-color: var(--primary-color-hover);
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(46, 160, 67, 0.4);
}

.button:active {
    transform: translateY(0);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

/* APOD Content Section */
#apod-content {
    text-align: center;
}

#apod-title {
    font-size: 2.5em;
    margin-bottom: 20px;
    color: var(--text-color-light);
    font-weight: 700;
    text-shadow: 0 0 8px rgba(255, 255, 255, 0.2);
}

#media-container {
    margin-bottom: 25px;
    overflow: hidden;
    border-radius: 10px;
    background-color: #000;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
    border: 2px solid var(--border-color);
    position: relative;
    transition: box-shadow 0.3s ease;
}

#media-container:hover {
    box-shadow: 0 0 20px rgba(46, 160, 67, 0.5);
}

#media-container img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: 8px;
}

#media-container iframe {
    width: 100%;
    height: 550px;
    border: none;
    border-radius: 8px;
}

.media-actions {
    margin-top: -15px;
    margin-bottom: 20px;
    text-align: right;
    padding-right: 10px;
}

#hdToggleBtn {
    background-color: var(--secondary-color);
}
#hdToggleBtn:hover {
    background-color: var(--secondary-color-hover);
    box-shadow: 0 8px 20px rgba(0, 123, 255, 0.4);
}

#apod-explanation {
    text-align: justify;
    margin-top: 30px;
    margin-bottom: 25px;
    font-size: 1.15em;
    color: var(--text-color-dark);
    padding: 0 10px;
}

#apod-copyright {
    font-style: italic;
    color: var(--text-color-secondary);
    font-size: 0.95em;
    margin-bottom: 30px;
}

/* Social Share */
.social-share {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px dashed var(--border-color);
}

.social-share h3 {
    margin-bottom: 15px;
    font-size: 1.3em;
    color: var(--text-color-light);
}

.social-button {
    text-decoration: none;
    color: white;
    padding: 10px 15px;
    border-radius: 5px;
    margin: 0 8px;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
}

.twitter { background-color: #1da1f2; }
.twitter:hover { background-color: #0e8ace; transform: scale(1.05); box-shadow: 0 0 15px #1da1f2; }
.facebook { background-color: #1877f2; }
.facebook:hover { background-color: #145cb3; transform: scale(1.05); box-shadow: 0 0 15px #1877f2; }


/* Rovers Page Specific Styles */
#rovers-page .gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.rover-photo-card {
    background-color: #1a202a;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-light);
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    border: 1px solid var(--border-color);
    position: relative;
}

.rover-photo-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 10px 25px rgba(46, 160, 67, 0.2);
    border-color: var(--primary-color);
}

.rover-photo-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    display: block;
}

.rover-photo-card .photo-info {
    padding: 15px;
    font-size: 0.9em;
    color: var(--text-color-dark);
    text-align: left;
    position: relative;
}
.rover-photo-card .photo-info::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 2px;
    background-color: var(--primary-color);
}

.rover-photo-card .photo-info p {
    margin: 5px 0;
    font-weight: 300;
}

.rover-photo-card .photo-info strong {
    color: var(--text-color-light);
}

/* About Page Specific Styles */
.about-content {
    text-align: justify;
    padding: 20px;
    font-size: 1.1em;
    line-height: 1.8;
    color: var(--text-color-dark);
}

.about-content ul {
    list-style: none; /* remove default list bullets */
    margin: 15px 0;
    padding-left: 20px;
}

.about-content li {
    position: relative;
    margin-bottom: 8px;
    padding-left: 25px; /* space for custom bullet */
}

.about-content li::before {
    content: "•"; /* custom bullet point */
    color: var(--primary-color);
    font-size: 1.5em;
    position: absolute;
    left: 0;
    top: -5px;
}

.about-content a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

.about-content a:hover {
    color: var(--primary-color-hover);
    text-decoration: underline;
}

.info-message {
    color: var(--text-color-secondary);
    font-size: 1.1em;
    text-align: center;
    margin-top: 20px;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.page {
    transition: opacity 0.5s ease-in-out, transform 0.5s ease-in-out;
    transform: translateY(20px);
}

.page.active {
    opacity: 1;
    display: block;
    transform: translateY(0);
}

.page:not(.active) {
    opacity: 0;
    height: 0;
    overflow: hidden;
}


.error {
    color: #ff6347;
    font-weight: bold;
    font-size: 1.1em;
    margin-bottom: 20px;
}

/* Loading Spinner */
.spinner {
    border: 8px solid rgba(255, 255, 255, 0.3);
    border-top: 8px solid var(--primary-color);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    animation: spin 1s linear infinite;
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -30px;
    margin-left: -30px;
    z-index: 10;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Footer */
footer {
    text-align: center;
    padding: 20px;
    margin-top: auto;
    color: var(--text-color-secondary);
    font-size: 0.9em;
    border-top: 1px solid var(--primary-color);
    background-color: var(--header-bg-color);
}

/* Fullscreen Modal */
.modal {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.95);
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal img {
    max-width: 95%;
    max-height: 95%;
    display: block;
    object-fit: contain;
}

.close-button {
    position: absolute;
    top: 20px;
    right: 35px;
    color: var(--text-color-light);
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s ease, transform 0.3s ease;
}

.close-button:hover,
.close-button:focus {
    color: var(--primary-color);
    transform: rotate(90deg);
}

/* Responsive Design */
@media (max-width: 992px) {
    header h1 { font-size: 2.2em; }
    .site-logo { height: 55px; }
    .main-menu { gap: 15px; }
    .main-menu li a { font-size: 1.1em; padding: 6px 10px; }
    .page-title { font-size: 2.2em; margin-bottom: 30px; }
    main { margin: 20px; padding: 20px; }
    .controls-container { flex-direction: column; gap: 10px; }
    .date-controls, .rover-selection, .rover-date-selection, .camera-selection { flex-direction: column; width: 100%; }
    .date-controls input, .date-controls button, .rover-selection select, .rover-date-selection input, .rover-date-selection button, .camera-selection select, .action-buttons button, .action-buttons .button {
        width: calc(100% - 20px);
        margin: 5px 0;
    }
    #apod-title { font-size: 1.8em; }
    #media-container iframe { height: 300px; }
    .social-button { display: block; margin: 10px auto; width: calc(100% - 30px); }
    #rovers-page .gallery-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
    .rover-photo-card img { height: 150px; }
    .home-content ul { flex-direction: column; align-items: center; }
    .home-content ul li { max-width: 90%; }
}

@media (max-width: 576px) {
    header h1 { font-size: 1.8em; }
    .site-logo { height: 45px; margin-right: 10px; }
    .main-menu { flex-wrap: wrap; gap: 10px; }
    .main-menu li a { font-size: 1em; padding: 5px 8px; }
    .page-title { font-size: 1.8em; }
    input[type="date"], select, .controls-container button, .button { font-size: 0.9em; padding: 10px 15px; }
    #apod-title { font-size: 1.5em; }
    #apod-explanation { font-size: 1em; }
    .rover-photo-card img { height: 120px; }
}