:root {
    --bg: #ffffff;
    --text: #2d3436;
    --header-bg: #0984e3;
    --card-bg: #f1f2f6;
    --accent: #74b9ff;
    --card-text: #2d3436;
}

body.dark {
    --bg: #2f3542;
    --text: #dfe6e9;
    --header-bg: #192a56;
    --card-bg: #3c40c6;
    --accent: #4834d4;
    --card-text: #ffffff;
}

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    transition: 0.3s;
    line-height: 1.6;
}

header {
    background-color: var(--header-bg);
    color: white;
    padding: 2rem 1rem;
    text-align: center;
    position: relative;
}

nav a { color: white; text-decoration: none; margin: 0 10px; font-weight: bold; }

.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    padding: 40px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.card {
    background: var(--card-bg);
    color: var(--card-text);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.15);
    transition: transform 0.3s;
}

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

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

.card-content { padding: 20px; }

.desc {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out;
}

button {
    cursor: pointer;
    background: var(--header-bg);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    margin-top: 10px;
}

#theme-toggle {
    position: absolute; top: 15px; right: 15px;
    background: none; border: none; font-size: 20px; cursor: pointer; color: white;
}

footer { text-align: center; padding: 25px; background: #2f3640; color: white; margin-top: 40px; }