:root {
    --bg-color: #ffffff;
    --text-color: #000000;
    --accent-color: #333333;
    --header-padding: 4em;
    --masonry-padding: 12em;
    --side-padding: 13%;
    --header-bg: rgba(255, 255, 255, 0.9);
}

body {
    font-family: "Varela", sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition:
        background-color 0.3s,
        color 0.3s;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--header-padding) var(--side-padding);
    background-color: var(--bg-color);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    background: var(--header-bg);
}

.logo {
    font-size: 3rem;
    font-weight: 500;
}

nav {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    position: relative;
    font-size: 1.4rem;
}

nav a::after {
    content: "";
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: width 0.3s;
}

nav a.active::after {
    width: 100%;
}

#theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--text-color);
    width: 1.5rem;
    height: 1.5rem;
    text-align: center;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

#theme-toggle .fa-sun {
    display: none;
}

body.dark-mode {
    --bg-color: #000000;
    --text-color: #ffffff;
    --accent-color: #cccccc;
    --header-bg: rgba(0, 0, 0, 0.8);
}

body.dark-mode #theme-toggle .fa-sun {
    display: inline-block;
}

body.dark-mode #theme-toggle .fa-moon {
    display: none;
}

main {
    flex-grow: 1;
    padding: var(--masonry-padding) var(--side-padding);
    background: var(--bg-color);
}

.masonry-grid {
    column-count: 4;
    column-gap: 0.5rem;
}

.masonry-grid img {
    width: 100%;
    height: auto;
    margin-bottom: 0.5rem;
    cursor: pointer;
    display: block;
    background: var(--bg-color);
    transition: opacity 0.6s;
    min-height: 100px;
}

.masonry-grid img.loading {
    filter: blur(30px);
}

.masonry-grid img:hover {
    opacity: 0.8;
}

#lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.95);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
}

#lightbox.hidden {
    display: none;
}

#lightbox-image {
    max-width: 90%;
    max-height: 90%;
}

.close {
    position: absolute;
    top: 15px;
    right: 35px;
    color: #f1f1f1;
    font-size: 50px;
    font-weight: bold;
    cursor: pointer;
}

#about {
    max-width: 800px;
    margin: 3rem auto 0;
    padding: 0 1rem;
}

footer {
    text-align: center;
    padding: 1rem 0 1rem;
    background-color: var(--bg-color);
}

.hidden {
    display: none;
}

.social-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    padding: 2rem 0 0;
    background-color: var(--bg-color);
}

.social-links a {
    color: var(--text-color);
    font-size: 1.5rem;
    transition: opacity 0.4s ease;
}

.social-links a:hover {
    opacity: 0.7;
}

/* Responsive design */
@media (max-width: 1600px) {
    .masonry-grid {
        column-count: 4;
    }
    :root {
        --masonry-padding: 10.9em;
        --header-padding: 4em;
        --side-padding: 13%;
    }
    .logo {
        font-size: 2.2rem;
    }
    nav a {
        font-size: 1.2rem;
    }
}

@media (max-width: 1200px) {
    .masonry-grid {
        column-count: 3;
    }
    :root {
        --masonry-padding: 8.4em;
        --header-padding: 3em;
        --side-padding: 13%;
    }
    .logo {
        font-size: 1.8rem;
    }
    nav a {
        font-size: 1rem;
    }
    #theme-toggle {
        font-size: 1rem;
        width: 1rem;
        height: 1rem;
    }
}

@media (max-width: 768px) {
    .masonry-grid {
        column-count: 2;
    }
    :root {
        --masonry-padding: 7em;
        --header-padding: 2.5em;
        --side-padding: 8%;
    }
    .logo {
        font-size: 1.5rem;
    }
    nav a {
        font-size: 0.9rem;
    }
    #theme-toggle {
        font-size: 0.9rem;
        width: 0.9rem;
        height: 0.9rem;
    }
    .social-links {
        gap: 1.5rem;
    }
    .social-links a {
        font-size: 1.2rem;
    }
}

@media (max-width: 576px) {
    .masonry-grid {
        column-count: 1;
    }
    :root {
        --masonry-padding: 5.6em;
        --header-padding: 2em;
        --side-padding: 5%;
    }
    .logo {
        font-size: 1.2rem;
    }
    nav a {
        font-size: 0.8rem;
    }
    #theme-toggle {
        font-size: 0.8rem;
        width: 0.8rem;
        height: 0.8rem;
    }

@media (max-width: 480px) {
    .masonry-grid {
        column-count: 1;
    }
    :root {
        --masonry-padding: 5.4em;
        --header-padding: 2em;
        --side-padding: 5%;
    }
    .logo {
        font-size: 1rem;
    }
    nav {
        gap: 0.5rem;
    }
    nav a {
        font-size: 0.6rem;
    }
    #theme-toggle {
        font-size: 0.8rem;
        width: 0.8rem;
        height: 0.8rem;
    }
    footer {
        font-size: 0.8rem;
    }
    .social-links {
        gap: 1rem;
    }
    .social-links a {
        font-size: 1rem;
    }
}