:root {
    --bg-deep: #0a0a14;
    --bg-card: rgba(22, 22, 44, 0.9);
    --bg-card-hover: rgba(35, 35, 60, 0.95);
    --accent-1: #8b5cf6;
    --accent-2: #6366f1;
    --accent-3: #06b6d4;
    --accent-4: #f59e0b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-border-hover: rgba(139, 92, 246, 0.4);
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --radius-lg: 20px;
    --radius-md: 14px;
    --radius-sm: 8px;
    --transition-smooth: 0.35s cubic-bezier(0.22, 0.61, 0.36, 1);
    --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    background: var(--bg-deep);
    color: var(--text-primary);
    font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    line-height: 1.6;
}

select {
    color-scheme: dark;
}

select option {
    background: #1a1a2e;
    color: #fff;
}

.page-wrap {
    width: 94%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 16px 0 40px;
}

.top-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 24px;
    background: var(--bg-card);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
    position: sticky;
    top: 16px;
    z-index: 100;
    transition: var(--transition-smooth);
    flex-wrap: wrap;
    gap: 12px;
}

.top-nav:hover {
    box-shadow: 0 8px 32px rgba(139, 92, 246, 0.1);
}

.brand {
    font-size: 24px;
    font-weight: 800;
    background: linear-gradient(135deg, #a78bfa, #60a5fa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.3px;
    white-space: nowrap;
    position: relative;
    padding-right: 24px;
}

.ai-indicator {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 10px;
    height: 10px;
    background: #22d3ee;
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 6px #22d3ee; }
    50% { box-shadow: 0 0 20px #22d3ee, 0 0 30px #06b6d4; }
}

.menu-links {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}

.menu-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    padding: 8px 16px;
    border-radius: 20px;
    transition: var(--transition-smooth);
    white-space: nowrap;
}

.menu-links a:hover {
    color: var(--text-primary);
    background: rgba(139, 92, 246, 0.15);
    transform: translateY(-1px);
}

.menu-links a.active {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.3), rgba(99, 102, 241, 0.3));
    color: #fff;
    box-shadow: 0 0 16px rgba(139, 92, 246, 0.25);
    position: relative;
}

.menu-links a.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 40%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-1), var(--accent-3));
    border-radius: 2px;
    animation: activeGlow 2s ease-in-out infinite;
}

@keyframes activeGlow {
    0%, 100% { opacity: 0.6; box-shadow: 0 0 4px var(--accent-1); }
    50% { opacity: 1; box-shadow: 0 0 12px var(--accent-1), 0 0 20px var(--accent-3); }
}

.user-box {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-left: 4px;
}

.user-chip {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.25), rgba(99, 102, 241, 0.2));
    border: 1px solid rgba(139, 92, 246, 0.3);
    border-radius: 20px;
    font-size: 12px;
    color: #e0d5ff;
    font-weight: 500;
}

.user-chip::before {
    content: '👤';
    margin-right: 4px;
    font-size: 11px;
}

.logout-link {
    font-size: 12px;
    color: var(--text-muted) !important;
    padding: 4px 8px !important;
    background: none !important;
    border: none !important;
    box-shadow: none !important;
}

.logout-link:hover {
    color: #ef4444 !important;
    background: none !important;
}

.nav-cart {
    position: relative;
}

.cart-badge {
    position: absolute;
    top: -4px;
    right: -8px;
    background: #ef4444;
    color: #fff;
    font-size: 10px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-auth {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: 20px;
    transition: var(--transition-smooth);
    border: 1px solid var(--glass-border);
}

.nav-auth:hover {
    color: var(--text-primary);
    background: rgba(255,255,255,0.05);
}

.ai-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.3), rgba(99, 102, 241, 0.3));
    border: 1px solid rgba(139, 92, 246, 0.4);
    border-radius: 25px;
    font-size: 14px;
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-smooth);
    box-shadow: 0 0 16px rgba(139, 92, 246, 0.2);
}

.ai-chip:hover {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.5), rgba(99, 102, 241, 0.5));
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(139, 92, 246, 0.4);
}

.ai-icon {
    font-size: 18px;
}

.hero-section {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(99, 102, 241, 0.1), rgba(6, 182, 212, 0.08));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 48px 32px;
    margin-bottom: 24px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(99, 102, 241, 0.1), rgba(6, 182, 212, 0.08));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 24px;
    text-align: center;
}

.hero h3 {
    font-size: 24px;
    font-weight: 700;
    margin: 0 0 8px 0;
    color: var(--text-primary);
}

.hero p {
    color: var(--text-secondary);
    font-size: 14px;
    margin: 0;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-section::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 42px;
    font-weight: 800;
    margin: 0 0 12px 0;
    background: linear-gradient(135deg, #fff, #c7d2fe, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    color: var(--text-secondary);
    font-size: 16px;
    margin: 0 0 24px 0;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 28px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 15px;
    border: none;
    cursor: pointer;
    transition: var(--transition-smooth);
    display: flex;
    align-items: center;
    gap: 8px;
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, rgba(255, 255, 255, 0.25) 0%, transparent 60%);
    opacity: 0;
    transition: opacity 0.3s ease-out;
    pointer-events: none;
    border-radius: inherit;
}

.btn:active::after {
    opacity: 1;
    transition: opacity 0s;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
    color: #fff;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 12px 32px rgba(139, 92, 246, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.12);
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn:active {
    transform: scale(0.95) !important;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--glass-border);
}

.stat-item {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 32px;
    font-weight: 700;
    background: linear-gradient(135deg, #a78bfa, #60a5fa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

.content-grid {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 24px;
}

.main-content {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.side-panel {
    display: flex;
    flex-direction: column;
    gap: 20px;
    position: sticky;
    top: 90px;
    height: fit-content;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.section-title {
    font-size: 20px;
    font-weight: 700;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-icon {
    font-size: 22px;
}

.view-all {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition-smooth);
}

.view-all:hover {
    color: var(--accent-1);
}

.books-carousel {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.book-card-mini {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition-smooth);
    position: relative;
}

.book-card-mini:hover {
    transform: translateY(-6px);
    border-color: var(--glass-border-hover);
    box-shadow: 0 16px 40px rgba(139, 92, 246, 0.2);
}

.book-cover-mini {
    aspect-ratio: 3/4;
    overflow: hidden;
    position: relative;
    background: rgba(0,0,0,0.2);
}

.book-cover-mini img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: var(--transition-smooth);
}

.book-icon {
    font-size: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    opacity: 0.9;
}

.book-card-mini:hover .book-cover-mini img {
    transform: scale(1.08);
}

.book-info {
    padding: 14px;
}

.book-title-mini {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 6px 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.book-category-mini {
    font-size: 12px;
    color: var(--text-muted);
    margin: 0 0 8px 0;
}

.book-price-mini {
    font-size: 18px;
    font-weight: 700;
    color: #f59e0b;
    margin: 0;
}

.add-cart-btn-mini {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(139, 92, 246, 0.9);
    border: none;
    color: #fff;
    font-size: 18px;
    cursor: pointer;
    opacity: 0;
    transition: var(--transition-smooth);
}

.book-card-mini:hover .add-cart-btn-mini {
    opacity: 1;
}

.add-cart-btn-mini:hover {
    background: var(--accent-1);
    transform: scale(1.1);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 12px;
}

.category-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 20px 12px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(139,92,246,0.1), transparent);
    opacity: 0;
    transition: var(--transition-smooth);
}

.category-card:hover {
    transform: translateY(-4px);
    border-color: var(--glass-border-hover);
    box-shadow: 0 8px 24px rgba(139, 92, 246, 0.15);
}

.category-card:hover::before {
    opacity: 1;
}

.category-icon {
    display: block;
    font-size: 32px;
    margin-bottom: 4px;
    transition: var(--transition-smooth);
}

.category-card:hover .category-icon {
    transform: scale(1.2);
}

.category-name {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
    z-index: 1;
}

.category-count {
    font-size: 11px;
    color: var(--text-muted);
    background: rgba(255,255,255,0.08);
    padding: 2px 8px;
    border-radius: 10px;
    position: relative;
    z-index: 1;
}

.ai-chat-card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    display: none;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.ai-chat-header {
    display: flex;
    align-items: center;
    padding: 16px;
    border-bottom: 1px solid var(--glass-border);
    background: rgba(139, 92, 246, 0.08);
}

.ai-avatar {
    font-size: 28px;
    margin-right: 12px;
}

.ai-info {
    flex: 1;
}

.ai-name {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
}

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

.ai-status.online {
    color: var(--success);
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 16px;
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-sm);
    transition: var(--transition-smooth);
}

.close-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.ai-chat-messages {
    flex: 1;
    padding: 16px;
    max-height: 280px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.message {
    max-width: 85%;
}

.message-content {
    padding: 10px 14px;
    border-radius: var(--radius-md);
    font-size: 14px;
    line-height: 1.5;
}

.typing-indicator .message-content {
    display: flex;
    gap: 4px;
    align-items: center;
    padding: 14px 16px;
}

.typing-indicator .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-1);
    animation: typingBounce 1.4s infinite ease-in-out;
}

.typing-indicator .dot:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator .dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.3; }
    30% { transform: translateY(-6px); opacity: 1; }
}

.ai-message .message-content {
    background: rgba(139, 92, 246, 0.15);
    color: var(--text-primary);
    border-radius: 0 var(--radius-md) var(--radius-md) var(--radius-md);
}

.user-message .message-content {
    background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
    color: #fff;
    border-radius: var(--radius-md) var(--radius-md) 0 var(--radius-md);
    margin-left: auto;
}

.ai-chat-input {
    display: flex;
    gap: 10px;
    padding: 14px;
    border-top: 1px solid var(--glass-border);
}

.ai-chat-input input {
    flex: 1;
    padding: 10px 14px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
    transition: var(--transition-smooth);
}

.ai-chat-input input:focus {
    border-color: var(--accent-1);
}

.send-btn {
    padding: 10px 20px;
    background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
    border: none;
    border-radius: var(--radius-md);
    color: #fff;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.send-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
}

.trending-section {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 20px;
}

.trending-section .section-title {
    font-size: 16px;
    margin-bottom: 14px;
}

.trending-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.trending-tag {
    padding: 6px 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-smooth);
}

.trending-tag:hover {
    background: rgba(139, 92, 246, 0.2);
    color: var(--text-primary);
}

.featured-section {
    margin-top: 24px;
}

.featured-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.featured-card {
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 12px;
    transition: var(--transition-smooth);
}

.featured-card:hover {
    border-color: var(--glass-border-hover);
    transform: translateX(4px);
}

.featured-rank {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
}

.featured-cover {
    width: 50px;
    height: 65px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    flex-shrink: 0;
}

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

.featured-info {
    flex: 1;
    min-width: 0;
}

.featured-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 4px 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.featured-meta {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 4px;
}

.featured-stars {
    color: #fbbf24;
    font-size: 13px;
    letter-spacing: 1px;
}

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

.featured-price {
    font-size: 16px;
    font-weight: 700;
    color: var(--accent-4);
    margin: 0;
}

.book-card-full {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: var(--transition-smooth);
}

.book-card-full:hover {
    border-color: var(--glass-border-hover);
    box-shadow: 0 10px 30px rgba(139, 92, 246, 0.12);
    transform: translateY(-2px);
}

.book-card-cover {
    width: 100%;
    height: 160px;
    overflow: hidden;
    position: relative;
}

.book-card-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

.book-card-full:hover .book-card-cover img {
    transform: scale(1.05);
}

.book-card-info {
    padding: 14px;
    flex: 1;
}

.book-card-info .book-id {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.book-card-info .book-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 4px 0;
}

.book-card-info .book-desc {
    font-size: 13px;
    color: var(--text-secondary);
    margin: 4px 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-card-info .book-category-tag {
    display: inline-block;
    padding: 3px 10px;
    background: rgba(139, 92, 246, 0.15);
    border-radius: 12px;
    font-size: 12px;
    color: #c7d2fe;
    margin-top: 6px;
}

.book-card-footer {
    padding: 12px 14px;
    border-top: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
}

.book-card-footer .book-price {
    font-size: 18px;
    font-weight: 700;
    color: #f59e0b;
}

.book-stock {
    font-size: 12px;
    padding: 2px 8px;
    border-radius: 10px;
}

.book-stock.stock-high {
    color: var(--success);
    background: rgba(34, 197, 94, 0.15);
}

.book-stock.stock-low {
    color: var(--warning);
    background: rgba(245, 158, 11, 0.15);
}

.book-stock.stock-out {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.15);
}

.book-actions {
    display: flex;
    gap: 8px;
}

.book-actions .btn {
    padding: 6px 14px;
    font-size: 13px;
}

.book-actions .btn-default {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-secondary);
    border: 1px solid var(--glass-border);
}

.book-actions .btn-default:hover {
    background: rgba(255, 255, 255, 0.12);
    color: var(--text-primary);
}

.book-actions .btn-primary {
    padding: 6px 14px;
    font-size: 13px;
}

.empty-state {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 240px;
}

.empty-state h4 {
    font-size: 18px;
    margin: 12px 0 8px 0;
    color: var(--text-secondary);
}

.empty-state p {
    font-size: 14px;
    margin: 0 0 16px 0;
}

.empty-state .btn {
    display: inline-flex;
}

.empty-icon {
    font-size: 48px;
    display: block;
    margin-bottom: 8px;
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.panel-card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 24px;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--glass-border);
}

.panel-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

.panel-subtitle {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

.search-container {
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--glass-border);
}

.search-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.search-box {
    flex: 1;
    display: flex;
    align-items: center;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: var(--radius-md);
    padding: 0 14px;
    transition: var(--transition-smooth);
}

.search-box:focus-within {
    border-color: var(--glass-border-hover);
    box-shadow: 0 0 12px rgba(139,92,246,0.15);
}

.search-icon {
    font-size: 16px;
    margin-right: 8px;
    opacity: 0.6;
}

.search-input {
    flex: 1;
    padding: 10px 0;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
}

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

.search-clear {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 14px;
    cursor: pointer;
    padding: 4px;
    border-radius: 50%;
    transition: var(--transition-smooth);
}

.search-clear:hover {
    color: var(--text-primary);
    background: rgba(255,255,255,0.1);
}

.search-btn {
    padding: 10px 20px;
    background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
    border: none;
    border-radius: var(--radius-md);
    color: #fff;
    font-weight: 500;
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.search-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(139,92,246,0.3);
}

.search-tags {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.tag-label {
    font-size: 12px;
    color: var(--text-muted);
    white-space: nowrap;
}

.search-tag {
    padding: 4px 12px;
    background: rgba(139,92,246,0.12);
    border: 1px solid rgba(139,92,246,0.2);
    border-radius: 14px;
    font-size: 12px;
    color: #c7d2fe;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.search-tag:hover {
    background: rgba(139,92,246,0.25);
    color: #e0e7ff;
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.book-desc-mini {
    font-size: 12px;
    color: var(--text-muted);
    margin: 0 0 10px 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.5;
}

.book-price-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}

.book-card-mini .btn-sm {
    width: 100%;
    padding: 8px;
    font-size: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.alert {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    margin-top: 16px;
    font-size: 14px;
    font-weight: 500;
}

.alert-warning {
    background: rgba(245, 158, 11, 0.15);
    color: #fbbf24;
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.alert-success {
    background: rgba(34, 197, 94, 0.15);
    color: #4ade80;
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.alert-danger {
    background: rgba(239, 68, 68, 0.15);
    color: #f87171;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

@media (max-width: 1024px) {
    .content-grid {
        grid-template-columns: 1fr;
    }
    .side-panel {
        position: static;
    }
    .books-carousel {
        grid-template-columns: repeat(2, 1fr);
    }
    .categories-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 28px;
    }
    .hero-stats {
        gap: 30px;
    }
    .books-carousel {
        grid-template-columns: 1fr;
    }
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .top-nav {
        padding: 10px 16px;
    }
    .menu-links {
        gap: 4px;
    }
    .menu-links a {
        padding: 6px 10px;
        font-size: 12px;
    }
    .nav-right {
        gap: 8px;
    }
    .ai-chip {
        padding: 6px 12px;
        font-size: 12px;
    }
}

/* ============ 购物车页面样式 ============ */
.cart-items-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 24px;
}

.cart-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 18px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    transition: var(--transition-smooth);
}

.cart-item:hover {
    border-color: rgba(255, 255, 255, 0.15);
    background: rgba(255, 255, 255, 0.05);
}

.cart-item-info {
    flex: 1;
    min-width: 0;
}

.cart-item-id {
    font-size: 11px;
    color: var(--text-muted);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.cart-item-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 2px 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 280px;
}

.cart-item-price {
    font-size: 13px;
    color: var(--text-secondary);
}

.cart-item-quantity {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.qty-btn {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-primary);
    font-size: 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-smooth);
}

.qty-btn:hover {
    background: rgba(139, 92, 246, 0.25);
    border-color: var(--accent-1);
}

.qty-value {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    min-width: 24px;
    text-align: center;
}

.cart-item-subtotal {
    font-size: 16px;
    font-weight: 700;
    color: var(--accent-4);
    min-width: 80px;
    text-align: right;
    flex-shrink: 0;
}

.cart-item-remove {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-smooth);
    flex-shrink: 0;
}

.cart-item-remove:hover {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger);
}

.cart-summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 20px;
    border-top: 1px solid var(--glass-border);
    flex-wrap: wrap;
    gap: 16px;
}

.cart-total {
    display: flex;
    align-items: center;
    gap: 10px;
}

.total-label {
    font-size: 16px;
    color: var(--text-secondary);
    font-weight: 500;
}

.total-amount {
    font-size: 24px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-4), #fbbf24);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cart-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.cart-suggest {
    margin-top: 28px;
    padding-top: 20px;
    border-top: 1px solid var(--glass-border);
}

.suggest-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-top: 12px;
}

.suggest-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 16px 12px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.suggest-card:hover {
    background: rgba(139, 92, 246, 0.1);
    border-color: var(--glass-border-hover);
    transform: translateY(-2px);
}

.suggest-icon {
    font-size: 24px;
}

.suggest-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
}

.suggest-price {
    font-size: 14px;
    font-weight: 700;
    color: var(--accent-4);
}

@media (max-width: 640px) {
    .suggest-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .cart-item {
        flex-wrap: wrap;
        gap: 10px;
    }
    .cart-item-name {
        max-width: 160px;
    }
}

/* ============ 1. 面包屑导航 ============ */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 0;
    margin-bottom: 16px;
    font-size: 13px;
    color: var(--text-muted);
    flex-wrap: wrap;
}

.breadcrumb-item {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition-smooth);
}

.breadcrumb-item:hover {
    color: var(--accent-1);
}

.breadcrumb-item.current {
    color: var(--text-secondary);
    font-weight: 500;
    pointer-events: none;
}

.breadcrumb-separator {
    color: var(--text-muted);
    font-size: 11px;
    opacity: 0.5;
    user-select: none;
}

/* ============ 2. 页脚 ============ */
.site-footer {
    background: var(--bg-card);
    border-top: 1px solid var(--glass-border);
    padding: 56px 24px 28px;
    margin-top: 80px;
}

.footer-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.3fr 1fr 1.2fr;
    gap: 48px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--glass-border);
}

.footer-col h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 16px 0;
    letter-spacing: 0.5px;
}

.footer-col p {
    font-size: 14px;
    color: #cbd5e1;
    line-height: 2;
    margin: 0 0 6px 0;
}

.footer-col a {
    color: #cbd5e1;
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition-smooth);
    display: inline-block;
}

.footer-col a:hover {
    color: var(--accent-1);
    text-decoration: underline;
}

.footer-col ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-col ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition-smooth);
    display: inline-block;
}

.footer-col ul li a:hover {
    color: var(--accent-1);
    transform: translateX(4px);
}

.footer-contact-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: #cbd5e1;
    margin-bottom: 10px;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    font-size: 13px;
    color: var(--text-secondary);
    max-width: 1400px;
    margin: 0 auto;
}

.footer-bottom p {
    margin: 0;
    font-size: 13px;
    color: var(--text-secondary);
}

.footer-copyright {
    text-align: center;
    padding-top: 20px;
    font-size: 13px;
    color: var(--text-secondary);
    max-width: 1400px;
    margin: 0 auto;
}

/* ============ 3. Toast 通知 ============ */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 10px;
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    pointer-events: auto;
    min-width: 280px;
    max-width: 400px;
    animation: toastSlideIn 0.4s cubic-bezier(0.22, 0.61, 0.36, 1) forwards;
}

.toast.removing {
    animation: toastSlideOut 0.3s ease-in forwards;
}

.toast-icon {
    font-size: 18px;
    flex-shrink: 0;
}

.toast-message {
    flex: 1;
    font-size: 14px;
    color: var(--text-primary);
    font-weight: 500;
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 14px;
    cursor: pointer;
    padding: 2px 4px;
    transition: var(--transition-smooth);
    flex-shrink: 0;
    border-radius: var(--radius-sm);
}

.toast-close:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.08);
}

.toast-success {
    border-left: 4px solid var(--success);
}

.toast-success .toast-icon {
    color: var(--success);
}

.toast-error {
    border-left: 4px solid var(--danger);
}

.toast-error .toast-icon {
    color: var(--danger);
}

.toast-warning {
    border-left: 4px solid var(--warning);
}

.toast-warning .toast-icon {
    color: var(--warning);
}

@keyframes toastSlideIn {
    from { opacity: 0; transform: translateX(100px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes toastSlideOut {
    from { opacity: 1; transform: translateX(0); }
    to { opacity: 0; transform: translateX(100px); }
}

/* ============ 4. 加载骨架屏 ============ */
.skeleton {
    background: linear-gradient(90deg, rgba(255, 255, 255, 0.04) 25%, rgba(255, 255, 255, 0.08) 50%, rgba(255, 255, 255, 0.04) 75%);
    background-size: 200% 100%;
    animation: skeletonShimmer 1.5s ease-in-out infinite;
    border-radius: var(--radius-sm);
}

.skeleton-text {
    height: 14px;
    margin-bottom: 8px;
    width: 100%;
    border-radius: var(--radius-sm);
}

.skeleton-text.short {
    width: 60%;
}

.skeleton-title {
    height: 20px;
    margin-bottom: 12px;
    width: 80%;
    border-radius: var(--radius-sm);
}

.skeleton-cover {
    aspect-ratio: 3/4;
    width: 100%;
    border-radius: var(--radius-sm);
}

.skeleton-badge {
    height: 24px;
    width: 80px;
    border-radius: 12px;
}

.skeleton-btn {
    height: 40px;
    width: 100%;
    border-radius: var(--radius-md);
}

.skeleton-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

@keyframes skeletonShimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ============ 5. 购物车复选框 ============ */
.cart-checkbox {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
    cursor: pointer;
}

.cart-checkbox input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.cart-checkbox .checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--glass-border);
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.03);
    transition: var(--transition-smooth);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.cart-checkbox:hover .checkmark {
    border-color: var(--accent-1);
    background: rgba(139, 92, 246, 0.1);
}

.cart-checkbox input:checked + .checkmark {
    background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
    border-color: var(--accent-1);
}

.cart-checkbox input:checked + .checkmark::after {
    content: '\2713';
    color: #fff;
    font-size: 12px;
    font-weight: 700;
}

.cart-checkbox input:focus-visible + .checkmark {
    outline: 2px solid var(--accent-1);
    outline-offset: 2px;
}

/* ============ 6. 库存徽章 ============ */
.stock-badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
}

.stock-badge.stock-high {
    color: var(--success);
    background: rgba(34, 197, 94, 0.15);
    border: 1px solid rgba(34, 197, 94, 0.2);
}

.stock-badge.stock-low {
    color: var(--warning);
    background: rgba(245, 158, 11, 0.15);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.stock-badge.stock-out {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* ============ 7+16. 增强按钮样式 (内联于 .btn 规则中) ============ */
/* 见上方 .btn::after (ripple), .btn:active (scale), hover scale/shadow */

/* ============ 8. 卡片增强悬停 (内联于 .book-card-mini:hover) ============ */
/* 见上方 .book-card-mini:hover */

/* ============ 9. 页面过渡动画 ============ */
.page-enter {
    animation: pageEnter 0.4s cubic-bezier(0.22, 0.61, 0.36, 1) forwards;
}

.page-exit {
    animation: pageExit 0.25s ease-in forwards;
}

@keyframes pageEnter {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pageExit {
    from { opacity: 1; transform: translateY(0); }
    to { opacity: 0; transform: translateY(-12px); }
}

/* ============ 10. 排序/筛选栏 ============ */
.filter-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.filter-label {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
    white-space: nowrap;
}

.filter-sort {
    padding: 8px 16px;
    background: #1a1a2e;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    outline: none;
    transition: var(--transition-smooth);
    font-family: inherit;
    color-scheme: dark;
}

.filter-sort:hover,
.filter-sort:focus {
    border-color: var(--accent-1);
}

.filter-sort option {
    background: #1a1a2e;
    color: #fff;
}

.filter-buttons {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 8px 18px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-smooth);
    white-space: nowrap;
    font-family: inherit;
}

.filter-btn:hover {
    background: rgba(139, 92, 246, 0.15);
    color: var(--text-primary);
    border-color: var(--glass-border-hover);
}

.filter-btn.active {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.35), rgba(99, 102, 241, 0.35));
    color: #fff;
    border-color: var(--accent-1);
    box-shadow: 0 0 12px rgba(139, 92, 246, 0.25);
}

.filter-result-count {
    margin-left: auto;
    font-size: 13px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
}

/* ---- 视图切换按钮 ---- */
.view-toggle {
    display: flex;
    gap: 0;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--glass-border);
}

.view-toggle button {
    padding: 8px 18px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 13px;
    transition: var(--transition-smooth);
    font-family: inherit;
    position: relative;
}

.view-toggle button:first-child {
    border-right: 1px solid var(--glass-border);
}

.view-toggle button.active {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.35), rgba(99, 102, 241, 0.3));
    color: #fff;
    font-weight: 600;
}

.view-toggle button:hover:not(.active) {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
}

/* ---- 深色复选框 ---- */
.dark-checkbox {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    user-select: none;
}

.dark-checkbox input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--glass-border);
    border-radius: 5px;
    background: rgba(255, 255, 255, 0.05);
    cursor: pointer;
    transition: var(--transition-smooth);
    flex-shrink: 0;
    position: relative;
    margin: 0;
}

.dark-checkbox input[type="checkbox"]:checked {
    background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
    border-color: var(--accent-1);
}

.dark-checkbox input[type="checkbox"]:checked::after {
    content: '\2713';
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 13px;
    font-weight: 700;
}

.dark-checkbox input[type="checkbox"]:hover {
    border-color: var(--accent-1);
}

.dark-checkbox:hover {
    color: var(--text-primary);
}

/* ---- 筛选操作按钮 ---- */
.filter-actions {
    display: flex;
    gap: 8px;
    margin-top: 14px;
}

.filter-actions .btn {
    flex: 1;
    padding: 10px 14px;
    font-size: 13px;
    border-radius: var(--radius-sm);
    justify-content: center;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 13px;
    border-radius: var(--radius-sm);
}

.btn-outline-danger {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #ef4444;
    cursor: pointer;
    transition: var(--transition-smooth);
    font-weight: 600;
    font-family: inherit;
}

.btn-outline-danger:hover {
    background: rgba(239, 68, 68, 0.2);
}

/* ============ 分页组件 ============ */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 36px;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

.pagination button {
    min-width: 44px;
    height: 44px;
    border-radius: 10px;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition-smooth);
    font-family: inherit;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 8px;
}

.pagination button:hover:not(:disabled) {
    background: rgba(139, 92, 246, 0.2);
    color: #fff;
    border-color: var(--glass-border-hover);
    transform: translateY(-1px);
}

.pagination button.active {
    background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
    border-color: var(--accent-1);
    color: #fff;
    font-weight: 700;
    box-shadow: 0 4px 16px rgba(139, 92, 246, 0.3);
}

.pagination button:disabled {
    opacity: 0.25;
    cursor: default;
    background: transparent;
}

/* ============ 11. 模态对话框 ============ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-smooth);
}

.modal-overlay.open {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 28px 32px;
    max-width: 420px;
    width: 90%;
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.5);
    transform: scale(0.9) translateY(20px);
    transition: var(--transition-smooth);
}

.modal-overlay.open .modal {
    transform: scale(1) translateY(0);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
}

.modal-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.modal-body {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 24px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* ============ 12. 表单验证样式 ============ */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
    transition: var(--transition-smooth);
}

.form-group select {
    color-scheme: dark;
}

.form-group select option {
    background: #1a1a2e;
    color: #fff;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--accent-1);
    box-shadow: 0 0 12px rgba(139, 92, 246, 0.15);
}

.form-group.error input,
.form-group.error select,
.form-group.error textarea {
    border-color: var(--danger);
    box-shadow: 0 0 12px rgba(239, 68, 68, 0.15);
}

.form-group .error-message {
    display: none;
    font-size: 12px;
    color: var(--danger);
    margin-top: 6px;
    align-items: center;
    gap: 4px;
}

.form-group.error .error-message {
    display: flex;
}

/* 快捷验证类 (兼容旧用法) */
.is-invalid {
    border-color: var(--danger) !important;
    box-shadow: 0 0 8px rgba(239, 68, 68, 0.2);
}

.is-valid {
    border-color: var(--success) !important;
}

.field-error {
    color: var(--danger);
    font-size: 12px;
    margin-top: 4px;
    display: block;
}

/* ============ 加载更多按钮 ============ */
.load-more-wrap {
    text-align: center;
    margin-top: 16px;
}

/* ============ 13. AI 功能样式 ============ */
.ai-answer-card {
    background: var(--bg-card);
    border: 1px solid var(--accent-1);
    border-radius: var(--radius-md);
    padding: 20px;
    box-shadow: 0 0 24px rgba(139, 92, 246, 0.15);
    position: relative;
    overflow: hidden;
}

.ai-answer-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--accent-1), var(--accent-3));
    border-radius: 2px;
}

.ai-answer-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.ai-answer-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    flex-shrink: 0;
    color: #fff;
}

.ai-answer-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--accent-1);
}

.ai-answer-content {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}

.ai-typing {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 0;
}

.ai-typing span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-1);
    animation: aiTypingBounce 1.4s infinite ease-in-out;
}

.ai-typing span:nth-child(2) { animation-delay: 0.2s; }
.ai-typing span:nth-child(3) { animation-delay: 0.4s; }

@keyframes aiTypingBounce {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.3; }
    30% { transform: translateY(-6px); opacity: 1; }
}

/* ============ AI 问书快捷标签 ============ */
.ai-quick-questions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.quick-q-tag {
    padding: 6px 14px;
    background: rgba(139, 92, 246, 0.12);
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-radius: 16px;
    font-size: 13px;
    color: #c7d2fe;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.quick-q-tag:hover {
    background: rgba(139, 92, 246, 0.25);
    color: #e0e7ff;
}

/* ============ 图书详情页 ============ */
.detail-layout {
    display: flex;
    gap: 32px;
}

.detail-cover {
    flex-shrink: 0;
    width: 260px;
}

.detail-cover-img {
    width: 100%;
    border-radius: var(--radius-md);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.detail-info {
    flex: 1;
    min-width: 0;
}

.detail-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 12px 0;
}

.detail-meta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 16px;
    font-size: 13px;
    color: var(--text-secondary);
}

.detail-desc {
    margin-bottom: 20px;
}

.detail-desc p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.8;
}

.detail-price-row {
    margin-bottom: 20px;
}

.detail-price {
    font-size: 32px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-4), #fbbf24);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.detail-actions {
    display: flex;
    gap: 12px;
}

/* ============ 15. 菜单激活指示器 (内联于 .menu-links a.active) ============ */
/* 见上方 .menu-links a.active::after 和 @keyframes activeGlow */

/* ============ 14. 响应式改进 ============ */
@media (max-width: 768px) {
    .detail-layout {
        flex-direction: column;
    }
    .detail-cover {
        width: 200px;
        margin: 0 auto;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }
    .books-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .filter-bar {
        flex-direction: column;
        align-items: stretch;
    }
    .filter-sort {
        width: 100%;
    }
    .filter-result-count {
        margin-left: 0;
        text-align: right;
    }
    .modal {
        padding: 24px;
    }
    .site-footer {
        padding: 32px 16px 16px;
    }
}

@media (max-width: 480px) {
    .books-grid {
        grid-template-columns: 1fr;
    }
    .hero-section {
        padding: 32px 16px;
    }
    .hero-title {
        font-size: 24px;
    }
    .hero-stats {
        gap: 20px;
    }
    .toast {
        min-width: unset;
        max-width: calc(100vw - 48px);
    }
    .breadcrumb {
        font-size: 12px;
    }
    .stock-badge {
        font-size: 11px;
        padding: 3px 10px;
    }
}

/* ============ 16. 品牌装饰点 ============ */
.ai-dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    background: #22d3ee;
    border-radius: 50%;
    animation: aiDotPulse 1.5s ease-in-out infinite;
    margin-left: 2px;
    vertical-align: middle;
}

@keyframes aiDotPulse {
    0%, 100% { box-shadow: 0 0 6px #22d3ee; }
    50% { box-shadow: 0 0 20px #22d3ee, 0 0 30px #06b6d4; }
}

/* ============ 17. 面包屑导航（深色主题） ============ */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 4px;
    margin-bottom: 14px;
    font-size: 13px;
    background: transparent;
    border-radius: 0;
}

.breadcrumb a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition-smooth);
}

.breadcrumb a:hover {
    color: var(--accent-1);
}

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

.breadcrumb .current {
    color: var(--text-secondary);
    font-weight: 500;
}

/* ============ 18. 导航栏品牌链接 ============ */
.nav-brand-link {
    text-decoration: none;
    color: inherit;
    display: flex;
    align-items: center;
    gap: 0;
}