/* Reusable UI components: Category cards, File/Folder cards, and Search. */
/* ─── Home Category Cards ─── */
#card1 a, #card2 a, #card3 a, #card4 a {
    display: flex;
    align-items: center;
    margin-top: 20px;
    margin-bottom: 20px;
    margin-right: 60%;
    border-radius: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    transition: transform 0.2s, box-shadow 0.2s, color 1s;
    color: white;
    font-size: 20px;
    text-decoration: none;
}

#card1 a { background-color: var(--card1-bg); }
#card2 a { background-color: var(--card2-bg); }
#card3 a { background-color: var(--card3-bg); }
#card4 a { background-color: var(--card4-bg); }

#card1 img, #card2 img, #card3 img, #card4 img {
    margin: 5px;
}

#card1 a:hover, #card2 a:hover, #card3 a:hover, #card4 a:hover {
    transform: translateY(-5px);
    background-color: #e0e0ff;
    color: black;
}

.cover {
    border-top-left-radius: 20px;
    border-bottom-left-radius: 20px;
    height: 150px;
    width: auto;
}

h2 {
    background-color: rgb(255, 255, 255);
}

.subject a{
    margin: 20px;
    margin-right: 800px;
    background-color: aquamarine;
    border-radius: 10px;
    font-size: 20px;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    transition: transform 0.2s, box-shadow 0.2s, color 1s;
    text-decoration: none;
}

.sciences { background-color: rgb(226, 29, 95); }

.cardsub a {
    background-color: rgb(0, 81, 95);
    margin-top: 20px;
    margin-bottom: 20px;
    margin-right: 800px;
    border-radius: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    transition: transform 0.2s, box-shadow 0.2s, color 1s;
    color: white;
    font-size: 20px;
    text-decoration: none;   
}

.agr a {
    background-color: rgb(0, 81, 95);
    margin-top: 220px;
    margin-bottom: 20px;
    margin-right: 800px;
    border-radius: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
    transition: transform 0.2s, box-shadow 0.2s, color 1s;
    color: white;
    font-size: 20px;
    text-decoration: none;
    padding: 20px; 
}

.agr a:hover {
    transform: translateY(-5px);
    background-color: #e0e0ff;
    color: black;
}

@media (max-width: 720px) {    
    #card1 a, #card2 a, #card3 a, #card4 a {
        margin-right: 0;
    } 
}

/* ─── Search Bar ─── */
.search-container {
    margin-bottom: 10px;
    text-align: center;
}

#searchInput {
    width: 80%;
    max-width: 400px;
    padding: 6px 10px;
    font-size: 14px;
    border: 1px solid #ccc;
    border-radius: 5px;
    outline: none;
    transition: 0.2s;
}

#searchInput:focus {
    border-color: #0073e6;
    box-shadow: 0 0 3px rgba(0,115,230,0.5);
}

/* ─── Explorer Cards & Actions ─── */
.folder-actions-bar {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

#downloadSelected {
    background-color: #007BFF;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
}

#downloadSelected:hover:not(:disabled) {
    background-color: #0056b3;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

#downloadSelected:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.select-all-toggle {
    background: #f0f4f8;
    color: #1e88e5;
    padding: 6px 16px;
    border-radius: 20px;
    border: 1px solid #d1d9e6;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.2s;
    user-select: none;
}

.select-all-toggle:hover {
    background: #e1e9f1;
    border-color: #b8c5d6;
}

.folder-card {
    background: #e8f0fe;
    padding: 10px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: 0.2s ease;
    margin: 5px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.folder-card:hover {
    background: #cce0ff;
}

.file-card {
    background: #f5f5f5;
    padding: 8px;
    border-radius: 5px;
    margin: 5px;
}

.folder-top, .file-top {
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.folder-checkbox {
    width: 17px;
    height: 17px;
    cursor: pointer;
}

.file-card span {
    overflow-wrap: anywhere;
    word-break: break-word;
}

/* ---- Badges & Meta ---- */
.card-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 0 16px;
    gap: 6px;
}

.file-count {
    font-size: 0.78rem;
    font-weight: 600;
    background-color: rgba(255, 255, 255, 0.25);
    color: white;
    padding: 2px 10px;
    border-radius: 20px;
    display: inline-block;
    width: fit-content;
    letter-spacing: 0.3px;
}

.folder-count-badge {
    font-size: 0.75rem;
    background-color: #c2d4f0;
    color: #1a3a6e;
    padding: 2px 8px;
    border-radius: 12px;
    white-space: nowrap;
    margin-left: 8px;
}

.folder-meta {
    margin: 6px 0 10px 4px;
}

.folder-file-count {
    font-size: 0.82rem;
    color: #555;
    background-color: rgba(255,255,255,0.75);
    padding: 3px 10px;
    border-radius: 10px;
}

/* ─── Skeletons & Shimmer ─── */
@keyframes shimmer {
    0%   { background-color: #e0e0e0; }
    50%  { background-color: #ececec; }
    100% { background-color: #e0e0e0; }
}

.skeleton-pulse {
    animation: shimmer 1.4s ease-in-out infinite;
}

.skeleton-line {
    background: #d6d6d6;
    border-radius: 4px;
    display: block;
}

.skeleton-home-card {
    pointer-events: none;
    cursor: default;
}

.skeleton-cover {
    width: 100%;
    aspect-ratio: 4 / 3;
    border-radius: 6px;
    background: #d6d6d6;
    margin-bottom: 10px;
}

.skeleton-count {
    display: inline-block;
    width: 60px;
    height: 12px;
    border-radius: 4px;
    background: #d6d6d6;
    vertical-align: middle;
}

.skeleton-file-card {
    background: #f0f0f0;
    border-radius: 8px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-height: 80px;
}

/* ─── File Card Action Buttons ─── */
.file-actions {
    display: flex;
    gap: 10px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.file-actions a, 
.file-actions button {
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.file-actions a[download],
.file-actions .open-zip-btn {
    background-color: #007BFF;
    color: white !important;
}

.file-actions a[download]:hover,
.file-actions .open-zip-btn:hover {
    background-color: #0056b3;
    transform: translateY(-1px);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.file-actions a:not([download]) {
    background-color: #e2e8f0;
    color: #1e293b !important;
}

.file-actions a:not([download]):hover {
    background-color: #cbd5e1;
}

/* Specific Colors */
.file-actions a:not([download]):not(:last-child) {
    background-color: #4CAF50 !important;
    color: white !important;
}

.file-actions a:not([download]):not(:last-child):hover {
    background-color: #3e8e41;
}

.file-actions a:last-child {
    background-color: #e2e8f0 !important;
    color: #1e293b !important;
}