/* ============================================
   Digital Bookshelf Plugin - Frontend Styles
   ============================================ */

:root {
    --dbs-accent:      #ff6b2b;
    --dbs-accent-dark: #e55a1c;
    --dbs-card-bg:     #231818;
    --dbs-cover-bg:    #3d2424;
    --dbs-text:        #ffffff;
    --dbs-text-muted:  #9a8a8a;
    --dbs-border:      rgba(255, 255, 255, 0.08);
    --dbs-radius:      12px;
}

/* ---- Wrapper ---- */
.dbs-bookshelf-wrapper {
    width: 100%;
    font-family: inherit;
    box-sizing: border-box;
}

/* ---- Filter Bar ---- */
.dbs-filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-bottom: 36px;
}

.dbs-filter-btn {
    display: inline-flex;
    align-items: center;
    padding: 8px 22px;
    border-radius: 50px;
    border: 1.5px solid rgba(255, 255, 255, 0.25);
    background: transparent;
    color: rgba(255, 255, 255, 0.75);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s ease;
    white-space: nowrap;
}

.dbs-filter-btn:hover {
    border-color: var(--dbs-accent);
    color: var(--dbs-accent);
    background: rgba(255, 107, 43, 0.08);
}

.dbs-filter-btn.active {
    background: var(--dbs-accent);
    border-color: var(--dbs-accent);
    color: #ffffff;
    font-weight: 600;
}

/* ---- Books Grid ---- */
.dbs-books-grid {
    display: grid;
    gap: 24px;
    width: 100%;
}

.dbs-cols-2 { grid-template-columns: repeat(2, 1fr); }
.dbs-cols-3 { grid-template-columns: repeat(3, 1fr); }
.dbs-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* ---- Book Card ---- */
.dbs-book-card {
    background-color: var(--dbs-card-bg);
    border-radius: var(--dbs-radius);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    border: 1px solid var(--dbs-border);
}

.dbs-book-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45);
}

.dbs-book-card.dbs-hidden {
    display: none;
}

/* ---- Cover Area ---- */
.dbs-book-cover {
    background-color: var(--dbs-cover-bg);
    background-image: radial-gradient(ellipse at 60% 40%, rgba(255,107,43,0.08) 0%, transparent 70%);
    position: relative;
    height: 220px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.dbs-cover-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.dbs-cover-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.6;
}

.dbs-cover-placeholder svg {
    width: 70px;
    height: auto;
    filter: drop-shadow(0 4px 12px rgba(0,0,0,0.4));
}

/* ---- Book Info ---- */
.dbs-book-info {
    padding: 20px;
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: 0;
}

.dbs-book-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--dbs-text);
    line-height: 1.4;
    margin: 0 0 8px 0;
}

.dbs-book-author {
    font-size: 13px;
    font-weight: 500;
    color: var(--dbs-accent);
    margin: 0 0 10px 0;
}

.dbs-book-desc {
    font-size: 13px;
    color: var(--dbs-text-muted);
    line-height: 1.6;
    margin: 0 0 16px 0;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ---- Meta Row ---- */
.dbs-book-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.dbs-year-badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    border-radius: 20px;
    background: rgba(255, 107, 43, 0.15);
    color: var(--dbs-accent);
    font-size: 12px;
    font-weight: 600;
}

.dbs-file-size {
    font-size: 12px;
    color: var(--dbs-text-muted);
}

/* ---- Action Row ---- */
.dbs-book-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.dbs-fav-btn {
    width: 44px;
    height: 44px;
    min-width: 44px;
    border-radius: 50%;
    background: var(--dbs-accent);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s ease, transform 0.15s ease;
    padding: 0;
}

.dbs-fav-btn:hover {
    background: var(--dbs-accent-dark);
    transform: scale(1.08);
}

.dbs-fav-btn.active svg path {
    fill: #fff;
}

.dbs-fav-btn svg {
    width: 18px;
    height: 18px;
    fill: rgba(255, 255, 255, 0.5);
    transition: fill 0.2s ease;
}

.dbs-fav-btn:hover svg,
.dbs-fav-btn.active svg {
    fill: #ffffff;
}

.dbs-download-btn {
    flex: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 20px;
    background: var(--dbs-accent);
    color: #ffffff !important;
    font-size: 14px;
    font-weight: 700;
    border-radius: 8px;
    text-decoration: none !important;
    border: none;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.15s ease;
    letter-spacing: 0.3px;
}

.dbs-download-btn:hover {
    background: var(--dbs-accent-dark);
    transform: translateY(-1px);
    color: #ffffff !important;
    text-decoration: none !important;
}

.dbs-no-pdf {
    background: rgba(255,255,255,0.08) !important;
    color: var(--dbs-text-muted) !important;
    cursor: not-allowed;
}

.dbs-no-pdf:hover {
    transform: none !important;
    background: rgba(255,255,255,0.08) !important;
}

/* ---- No Books State ---- */
.dbs-no-books {
    text-align: center;
    padding: 60px 20px;
    color: var(--dbs-text-muted);
    font-size: 15px;
}

/* ---- Responsive ---- */
@media (max-width: 1024px) {
    .dbs-cols-4 { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
    .dbs-cols-3,
    .dbs-cols-4 { grid-template-columns: repeat(2, 1fr); }

    .dbs-book-cover { height: 180px; }
}

@media (max-width: 480px) {
    .dbs-cols-2,
    .dbs-cols-3,
    .dbs-cols-4 { grid-template-columns: 1fr; }

    .dbs-filter-bar { gap: 8px; }
    .dbs-filter-btn { padding: 7px 16px; font-size: 13px; }
}