:root {
    /* Base Scale for Font Sizing */
    --font-scale: 1;

    /* Theme Variables - Default: Dark Sky Blue */
    --bg-color: #1a2634;
    --card-bg: #243447;
    --text-color: #e8e6e3;
    --accent-color: #4db6ac;
    --border-color: #34495e;
    --modal-bg: #243447;
    --overlay-bg: rgba(0, 0, 0, 0.85);
}

/* Theme Classes */
/* Dark Themes */
.theme-0 { /* Dark Sky Blue (Default) */ }
.theme-1 { --bg-color: #2d1b2e; --card-bg: #452c48; --text-color: #e0d0e0; --accent-color: #ce93d8; --border-color: #5c3a60; --modal-bg: #452c48; } /* Dark Purple */
.theme-2 { --bg-color: #1b2e1b; --card-bg: #2c482c; --text-color: #d0e0d0; --accent-color: #a5d6a7; --border-color: #3a603a; --modal-bg: #2c482c; } /* Dark Green */
.theme-3 { --bg-color: #000000; --card-bg: #121212; --text-color: #ffffff; --accent-color: #90caf9; --border-color: #333333; --modal-bg: #121212; } /* OLED */

/* Light Themes */
.theme-4 { --bg-color: #f5f5f5; --card-bg: #ffffff; --text-color: #333333; --accent-color: #0277bd; --border-color: #e0e0e0; --modal-bg: #ffffff; --overlay-bg: rgba(0, 0, 0, 0.5); } /* Snow */
.theme-5 { --bg-color: #e3f2fd; --card-bg: #ffffff; --text-color: #0d47a1; --accent-color: #0288d1; --border-color: #bbdefb; --modal-bg: #ffffff; --overlay-bg: rgba(0, 0, 0, 0.5); } /* Sky */
.theme-6 { --bg-color: #f3e5f5; --card-bg: #ffffff; --text-color: #4a148c; --accent-color: #8e24aa; --border-color: #e1bee7; --modal-bg: #ffffff; --overlay-bg: rgba(0, 0, 0, 0.5); } /* Purple */
.theme-7 { --bg-color: #e8f5e9; --card-bg: #ffffff; --text-color: #1b5e20; --accent-color: #43a047; --border-color: #c8e6c9; --modal-bg: #ffffff; --overlay-bg: rgba(0, 0, 0, 0.5); } /* Green */

* {
    box-sizing: border-box;
}

body {
    font-family: 'Lato', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    font-size: calc(1rem * var(--font-scale));
    transition: background-color 0.3s, color 0.3s;
}

/* Typography */
h1, h2, h3 {
    font-family: 'Gabriela', serif;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.banner-container {
    width: 100%;
    margin-bottom: 20px;
    text-align: center;
}

.main-banner {
    width: 100%;
    max-width: 1600px;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

.page-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.2);
}

.page-description {
    text-align: center;
    margin-bottom: 30px;
    font-size: 1.1rem;
    opacity: 0.8;
}

/* Controls */
.top-controls {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 100;
}

.top-controls button {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    font-size: 1.2rem;
    padding: 8px 12px;
    cursor: pointer;
    border-radius: 50%;
    margin-left: 5px;
    transition: transform 0.2s;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.top-controls button:hover {
    transform: translateY(-2px);
}

/* Search */
.search-container {
    position: sticky;
    top: 10px;
    z-index: 50;
    margin-bottom: 20px;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

#search-input {
    width: 100%;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
    color: var(--text-color);
    font-family: 'Lato', sans-serif;
    font-size: 1.1rem;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

#search-input:focus {
    outline: 2px solid var(--accent-color);
}

/* Grid */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 20px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

.card-number {
    position: absolute;
    top: 10px;
    right: 15px;
    font-family: 'Gabriela', serif;
    font-size: 1.5rem;
    opacity: 0.1;
    font-weight: bold;
}

.card-title {
    margin-top: 0;
    font-size: 1.3rem;
    color: var(--accent-color);
    margin-bottom: 10px;
}

.card-summary {
    font-size: 1rem;
    line-height: 1.5;
}

.card-detail-hidden {
    display: none;
}

/* Modal */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--overlay-bg);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: var(--modal-bg);
    width: 95%;
    max-width: 800px;
    max-height: 90vh;
    border-radius: 12px;
    position: relative;
    padding: 40px;
    overflow-y: auto;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    border: 1px solid var(--border-color);
}

.modal-body {
    font-size: 1.2rem;
    line-height: 1.6;
}

.modal-body p {
    margin-bottom: 20px;
}

.modal-body a {
    color: var(--accent-color);
    text-decoration: none;
}

.modal-body a:hover {
    text-decoration: underline;
}

.close-btn {
    position: absolute;
    top: 10px;
    right: 15px;
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--text-color);
    cursor: pointer;
    opacity: 0.7;
}

.close-btn:hover {
    opacity: 1;
}

/* Modal Nav */
.modal-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 30px;
}

.nav-btn {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 10px 20px;
    font-size: 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
}

.nav-btn:hover {
    background-color: var(--accent-color);
    color: #fff;
}

/* Footer */
.site-footer {
    text-align: center;
    margin-top: 50px;
    padding: 20px;
    opacity: 0.6;
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        width: 100%;
        height: 100%;
        max-height: 100%;
        border-radius: 0;
        padding: 20px;
    }
    
    .nav-btn {
        padding: 15px 25px; /* Larger touch target */
    }
}