/* ============================================================================
   NOT REGISTERED PAGE — matches Chitatel.css design language
   ============================================================================ */

body {
    background: var(--bg, #f4f6f8);
}

/* ============================================================================
   HEADER
   ============================================================================ */

header {
    background: rgba(255, 255, 255, 0.92);
    padding: 18px 28px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.logo {
    display: flex;
    align-items: center;
    gap: 14px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
}

.logo-text h1 {
    font-size: 20px;
    font-weight: var(--fw-bold, 700);
    color: var(--text);
    margin: 0 0 2px 0;
    line-height: 1.2;
}

.logo-text p {
    font-size: var(--font-size-xs, 12px);
    color: var(--text-muted);
    margin: 0;
}

.login-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: linear-gradient(135deg, var(--primary, #155DFC) 0%, var(--primary-dark, #1246c7) 100%);
    color: var(--white) !important;
    font-size: var(--font-size-sm, 13px);
    font-weight: var(--fw-semibold, 600);
    font-family: var(--font-sans);
    border: none;
    border-radius: var(--radius-sm, 8px);
    cursor: pointer;
    transition: var(--transition-fast);
    box-shadow: 0 2px 8px rgba(21, 93, 252, 0.25);
    letter-spacing: 0.3px;
}

.login-btn:hover {
    opacity: 0.9;
    box-shadow: 0 4px 16px rgba(21, 93, 252, 0.35);
    transform: translateY(-1px);
}

/* ============================================================================
   MAIN
   ============================================================================ */

main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 40px 28px;
}

/* ============================================================================
   PAGE HERO
   ============================================================================ */

.page-hero {
    margin-bottom: 32px;
    animation: fadeInUp 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.page-hero h2 {
    font-size: 28px;
    font-weight: var(--fw-extrabold, 800);
    margin: 0 0 8px 0;
    background: linear-gradient(135deg, var(--text) 0%, var(--text-secondary, #475569) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-hero p {
    color: var(--text-muted);
    font-size: var(--font-size-base, 14px);
    margin: 0;
}

/* ============================================================================
   STATISTICS
   ============================================================================ */

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.stat-item {
    background: var(--white);
    padding: 24px;
    border-radius: var(--radius, 10px);
    border: 1px solid var(--border);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.stat-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.stat-label {
    display: block;
    font-size: var(--font-size-xs, 12px);
    color: var(--text-muted);
    font-weight: var(--fw-semibold, 600);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.stat-value {
    display: block;
    font-size: 32px;
    font-weight: var(--fw-extrabold, 800);
    color: var(--text);
}

.stat-value.available { color: var(--success, #10b981); }
.stat-value.issued    { color: var(--warning, #f59e0b); }

/* ============================================================================
   TAB HEADER + SEARCH
   ============================================================================ */

.tab-header {
    margin-bottom: 20px;
}

.tab-header h2 {
    font-size: 28px;
    font-weight: var(--fw-extrabold, 800);
    margin: 0 0 20px 0;
    background: linear-gradient(135deg, var(--text) 0%, var(--text-secondary, #475569) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.search-wrap {
    position: relative;
    display: flex;
    align-items: center;
    max-width: 560px;
}

.search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
    z-index: 1;
}

.search-input {
    width: 100%;
    padding: 13px 44px 13px 48px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius, 10px);
    font-size: var(--font-size-base, 14px);
    color: var(--text);
    background: var(--white);
    font-family: var(--font-sans);
    outline: none;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-sm);
    box-sizing: border-box;
}

.search-input:focus {
    border-color: var(--primary, #155DFC);
    box-shadow: 0 0 0 3px rgba(21, 93, 252, 0.12);
    background: var(--white);
}

.search-input::placeholder {
    color: var(--text-muted);
}

/* Кнопка очистки */
.search-clear {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    display: none;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border: none;
    border-radius: 50%;
    background: #e2e8f0;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition-fast);
    padding: 0;
    flex-shrink: 0;
}

.search-clear.visible {
    display: flex;
}

.search-clear:hover {
    background: #cbd5e1;
    color: var(--text);
}

/* Счётчик результатов */
.search-meta {
    display: none;
    margin-top: 8px;
    font-size: var(--font-size-xs, 12px);
    color: var(--text-muted);
    font-weight: var(--fw-semibold, 600);
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

/* ============================================================================
   FILTER CHIPS
   ============================================================================ */

.filter-chips {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.chip {
    padding: 8px 16px;
    border-radius: 20px;
    font-size: var(--font-size-sm, 13px);
    font-weight: var(--fw-semibold, 600);
    border: 1px solid var(--border);
    background: var(--white);
    cursor: pointer;
    color: var(--text-muted);
    transition: var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-family: var(--font-sans);
}

.chip:hover {
    border-color: var(--primary, #155DFC);
    color: var(--primary, #155DFC);
}

.chip.active {
    background: linear-gradient(135deg, var(--primary, #155DFC) 0%, var(--primary-dark, #1246c7) 100%);
    color: var(--white);
    border-color: var(--primary, #155DFC);
    box-shadow: 0 2px 8px rgba(21, 93, 252, 0.3);
}

/* ============================================================================
   BOOKS GRID — идентично Chitatel
   ============================================================================ */

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 18px;
}

.book-item {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.book-item:hover {
    border-color: var(--primary, #155DFC);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12);
    transform: translateY(-4px);
}

.book-cover {
    width: 100%;
    aspect-ratio: 3 / 4;
    overflow: hidden;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.book-cover.placeholder {
    background: linear-gradient(135deg, #e5e7eb 0%, #d1d5db 100%);
    color: var(--text-muted);
}

.book-header {
    padding: 12px 14px;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 10px;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    border-bottom: 1px solid var(--border);
}

.book-header h3 {
    font-size: var(--font-size-sm, 13px);
    font-weight: 600;
    margin: 0;
    color: var(--text);
    flex: 1;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-author {
    font-size: var(--font-size-xs, 12px);
    color: var(--text-muted);
    padding: 8px 14px 0;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-isbn {
    font-size: var(--font-size-xs, 11px);
    color: var(--text-secondary, #64748b);
    padding: 4px 14px 0;
    margin: 0;
}

.book-action {
    padding: 10px 14px 14px;
    margin-top: auto;
}

/* ============================================================================
   STATUS BADGES — идентично Chitatel
   ============================================================================ */

.status-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 16px;
    font-size: var(--font-size-xs, 12px);
    font-weight: 600;
    border: 1px solid transparent;
    white-space: nowrap;
    flex-shrink: 0;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.status-badge.available {
    background: #d1fae5;
    color: #065f46;
}

.status-badge.issued {
    background: #fed7aa;
    color: #92400e;
}

.status-badge.reserved {
    background: #bfdbfe;
    color: #1e40af;
    border-color: #fcd34d;
}

/* ============================================================================
   BUTTONS — идентично Chitatel
   ============================================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 18px;
    border: none;
    border-radius: var(--radius-sm, 8px);
    font-size: var(--font-size-sm, 13px);
    font-weight: var(--fw-bold, 700);
    cursor: pointer;
    transition: var(--transition-fast);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-family: var(--font-sans);
    width: 100%;
}

.btn-login {
    background: linear-gradient(135deg, var(--primary, #155DFC) 0%, var(--primary-dark, #1246c7) 100%);
    color: var(--white);
    border: 1px solid var(--primary, #155DFC);
    box-shadow: 0 2px 8px rgba(21, 93, 252, 0.3);
}

.btn-login:hover {
    opacity: 0.9;
    box-shadow: 0 4px 14px rgba(21, 93, 252, 0.4);
}

/* ============================================================================
   NO RESULTS STATE
   ============================================================================ */

.no-results {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 24px;
    color: var(--text-muted);
    gap: 12px;
    text-align: center;
}

.no-results svg { opacity: 0.35; }

.no-results p {
    font-size: 16px;
    font-weight: var(--fw-semibold, 600);
    color: var(--text-secondary, #64748b);
    margin: 0;
}

.no-results span {
    font-size: var(--font-size-sm, 13px);
    color: var(--text-muted);
}

/* ============================================================================
   EMPTY STATE
   ============================================================================ */

.empty-state {
    text-align: center;
    padding: 60px 24px;
    color: var(--text-muted);
    font-size: var(--font-size-base, 14px);
    grid-column: 1 / -1;
}

/* ============================================================================
   ANIMATIONS
   ============================================================================ */

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ============================================================================
   RESPONSIVE
   ============================================================================ */

@media (max-width: 768px) {
    header { padding: 16px 20px; }
    main   { padding: 24px 20px; }

    .stats { grid-template-columns: 1fr; gap: 12px; }

    .books-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 16px;
    }

    .filter-chips { gap: 8px; }

    .chip {
        padding: 6px 12px;
        font-size: var(--font-size-xs, 12px);
    }

    .search-input { font-size: 16px; }
    .search-wrap  { max-width: 100%; }
}

@media (max-width: 480px) {
    header { padding: 12px 16px; }
    main   { padding: 16px; }

    .logo-text p   { display: none; }
    .logo-text h1  { font-size: 16px; }
    .tab-header h2 { font-size: 22px; }
    .stat-value    { font-size: 24px; }

    .books-grid { grid-template-columns: 1fr; }
}