/* ===== Base Styles ===== */
:root {
    --primary: #1a3e72;
    --primary-dark: #0d2b57;
    --primary-light: #2a5a9a;
    --secondary: #d4af37;
    --secondary-dark: #b5942a;
    --light: #f8f9fa;
    --light-gray: #e9ecef;
    --medium-gray: #ced4da;
    --dark: #212529;
    --white: #ffffff;
    --black: #000000;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    color: var(--dark);
    line-height: 1.6;
    background-color: var(--light);
    padding-top: 80px;
    overflow-x: hidden;
}

h1, h2, h3, h4 {
    font-weight: 600;
    line-height: 1.2;
}

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

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

/* ===== Navigation ===== */
header {
    background: var(--primary);
    color: var(--white);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 5%;
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
    font-weight: 600;
    font-size: 1.2rem;
    transition: var(--transition);
}

.logo:hover {
    opacity: 0.9;
}

.logo img {
    height: 50px;
    border-radius: 4px;
}

.menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 5px;
    transition: var(--transition);
}

.menu-btn:hover {
    color: var(--secondary);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 25px;
}

.nav-menu a {
    color: var(--white);
    font-weight: 500;
    transition: var(--transition);
    padding: 5px 0;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    background: var(--secondary);
    bottom: 0;
    left: 0;
    transition: var(--transition);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.nav-menu a:hover {
    color: var(--secondary);
}

/* ===== Gallery Styles ===== */
.gallery-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 30px 5%;
}

.gallery-header {
    text-align: center;
    margin-bottom: 40px;
}

.gallery-header h1 {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
}

.gallery-header h1::after {
    content: '';
    position: absolute;
    width: 50%;
    height: 3px;
    background: var(--secondary);
    bottom: -10px;
    left: 25%;
}

.gallery-header p {
    max-width: 700px;
    margin: 0 auto;
    color: var(--dark);
}

.filter-controls {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-bottom: 30px;
}

.filter-btn {
    padding: 8px 15px;
    background: var(--white);
    border: 1px solid var(--primary);
    color: var(--primary);
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.filter-btn:hover, 
.filter-btn.active {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}

.gallery-item {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
}

.gallery-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.gallery-img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    display: block;
    transition: var(--transition);
}

.gallery-item:hover .gallery-img {
    transform: scale(1.05);
}

.gallery-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
    color: var(--white);
    padding: 20px;
}

.gallery-caption h3 {
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.gallery-caption .date {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* ===== Lightbox Styles ===== */
.lightbox {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 2000;
    overflow: auto;
    padding: 20px;
}

.lightbox.active {
    display: block;
}

.lightbox-content {
    max-width: 1200px;
    margin: 80px auto;
    padding: 20px;
    position: relative;
}

.lightbox-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    color: var(--white);
}

.lightbox-title {
    font-size: 1.5rem;
    font-weight: 600;
}

.close-btn {
    color: var(--white);
    font-size: 2rem;
    cursor: pointer;
    transition: var(--transition);
    background: none;
    border: none;
    padding: 5px;
}

.close-btn:hover {
    color: var(--secondary);
    transform: rotate(90deg);
}

.lightbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.lightbox-item {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.lightbox-item:hover {
    transform: translateY(-5px);
}

.lightbox-item img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    display: block;
}

.lightbox-item .gallery-caption {
    padding: 15px;
}

/* Back button styles */
.back-btn {
    display: inline-block;
    padding: 10px 20px;
    background: var(--primary);
    color: var(--white);
    text-decoration: none;
    border-radius: 5px;
    transition: var(--transition);
    margin-top: 20px;
    border: none;
    cursor: pointer;
    font-weight: 500;
    text-align: center;
}

.back-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* Loading animation */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.gallery-item, .lightbox-item {
    animation: fadeIn 0.5s ease-in-out;
}

/* ===== Responsive Styles ===== */
@media (max-width: 992px) {
    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
    
    .lightbox-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
}

@media (max-width: 768px) {
    .menu-btn {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        background: var(--primary);
        flex-direction: column;
        align-items: center;
        padding: 30px 0;
        gap: 20px;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .gallery-header h1 {
        font-size: 2rem;
    }
    
    .gallery-header p {
        font-size: 0.9rem;
    }
}

@media (max-width: 576px) {
    .nav-container {
        padding: 15px 20px;
    }
    
    .gallery-grid {
        grid-template-columns: 1fr;
    }
    
    .lightbox-grid {
        grid-template-columns: 1fr;
    }
    
    .gallery-header h1 {
        font-size: 1.8rem;
    }
    
    .filter-controls {
        gap: 8px;
    }
    
    .filter-btn {
        padding: 6px 12px;
        font-size: 0.9rem;
    }
    
    .lightbox-content {
        margin: 60px auto;
        padding: 10px;
    }
    
    .lightbox-title {
        font-size: 1.2rem;
    }
}

/* Print styles */
@media print {
    header, .filter-controls, .back-btn {
        display: none;
    }
    
    body {
        padding-top: 0;
        background: none;
    }
    
    .gallery-container {
        padding: 0;
    }
    
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    
    .gallery-item {
        page-break-inside: avoid;
    }
}