.brand-info-layout .book-details .detail-grid {
    margin: 0; /* 覆盖默认外边距，保持紧凑 */
}

.brand-info-layout .product-info-section .product-description {
    padding: 20px 20px 20px 0; /* 左侧说明区的内边距 */
}
/* 参考书柜样式的设计 */
:root {
    --background: #f8f8f7;
    --text: #121415;
    --text-light: #5a6c7d;
    --text-muted: #8a9ba8;
    --border: #d1d9e0;
    --border-light: #e8ecef;
    --accent: #2c3e50;
    --card-bg: #ffffff;
    --shelf-bg: #f5f5f4;
    --font-main: 'STHeiti', 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', 'Heiti SC', 'WenQuanYi Micro Hei', sans-serif;
    --font-serif: 'STHeiti', 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', 'Heiti SC', 'WenQuanYi Micro Hei', sans-serif;
    --container-width: 840px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    --spacing-xxl: 24px;
    --border-radius: 2px;
    /* 后台配色（更素、更克制） */
    --admin-accent: #6b7280; /* slate-500 */
    --admin-accent-soft: #f3f4f6; /* gray-100 */
    --admin-accent-strong: #374151; /* slate-700 */
    --admin-shadow: 0 16px 32px rgba(15, 23, 42, 0.06);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: var(--font-main);
    color: var(--text);
    background: var(--background);
    background-image: url('../bg_wall.jpg');
    background-repeat: repeat;
    background-size: auto;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-size: 14px;
}

a {
    text-decoration: none;
    color: inherit;
    transition: opacity 0.2s ease;
}

a:hover {
    opacity: 0.8;
}

.container {
    width: min(100%, var(--container-width));
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* 顶部导航 */
.main-nav {
    z-index: 1000;
    padding: 50px 0 10px 0;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: var(--container-width);
    margin: 0 auto;
}

/* Logo区域 */
.brand-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.brand-logo {
    width: 80px;
    height: auto;
    display: block;
    transform: rotate(-5deg);
}

.brand-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.brand-title {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    font-weight: 400;
    letter-spacing: 0.02em;
    color: var(--text);
    margin: 0;
    line-height: 1;
}

.brand-subtitle {
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    color: var(--text-light);
    margin: 0;
    line-height: 1;
}

.brand-tagline {
    font-size: 0.75rem;
    color: var(--text-light);
    margin: 0;
    line-height: 1.3;
    letter-spacing: 0.01em;
}

/* 导航区域 */
.nav-section {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.nav-links {
    display: flex;
    gap: var(--spacing-xl);
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-search {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.nav-search input[type="search"] {
    width: 180px;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius);
    background-color: rgba(255, 255, 255, 0.85);
    font-size: 0.85rem;
    color: var(--text);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.nav-search input[type="search"]:focus {
    outline: none;
    border-color: var(--text-light);
    box-shadow: 0 0 0 2px rgba(90, 108, 125, 0.15);
}

.nav-search button {
    padding: var(--spacing-xs) var(--spacing-md);
    border: none;
    border-radius: var(--border-radius);
    background-color: var(--text-light);
    color: #fff;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.2s ease;
}

.nav-search button:hover {
    background-color: var(--text);
    transform: translateY(-1px);
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.search-empty {
    margin: var(--spacing-xl) auto;
    padding: var(--spacing-xl);
    text-align: center;
    color: var(--text-light);
    background-color: rgba(255, 255, 255, 0.6);
    border-radius: var(--border-radius);
}

.search-empty p {
    margin-bottom: var(--spacing-lg);
    font-size: 0.9rem;
    letter-spacing: 0.02em;
}

/* 管理员快捷编辑提示 */
.admin-edit-banner {
    margin: 0 0 var(--spacing-xl);
    /* display: flex; */
    text-align: center;
    justify-content: flex-end;
}

.admin-edit-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 999px;
    border: 1px solid var(--admin-accent);
    color: var(--admin-accent-strong);
    background: var(--admin-accent-soft);
    font-size: 12px;
    letter-spacing: 0.5px;
    transition: background 0.2s ease, color 0.2s ease, opacity 0.2s ease;
}

.admin-edit-link:hover {
    background: var(--admin-accent-strong);
    color: #fff;
    opacity: 1;
}

.bookshelf-year-section {
    margin-bottom: var(--spacing-xxl);
}

.bookshelf-year-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
    padding: 0 var(--spacing-md);
}

.bookshelf-year-header .bookshelf-title {
    margin: 0;
}

.bookshelf-year-count {
    font-size: 0.8rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

/* 联系我们 */
.contact-hero {
    padding: var(--spacing-xxl) 0 var(--spacing-xl);
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.12), rgba(14, 165, 233, 0.08));
    margin-bottom: var(--spacing-xl);
}

.contact-hero-inner {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
    padding: 0 var(--spacing-xl);
}

.contact-hero-inner h1 {
    margin: 0 0 var(--spacing-sm);
    font-size: 1.6rem;
    letter-spacing: 0.06em;
}

.contact-hero-inner p {
    margin: 0;
    color: var(--text-light);
    font-size: 0.9rem;
    letter-spacing: 0.02em;
}

.contact-section {
    margin-bottom: var(--spacing-xxl);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: var(--spacing-xxl);
}

.contact-form-card,
.contact-info-card {
    background: rgba(255, 255, 255, 0.82);
    border-radius: 20px;
    padding: var(--spacing-xxl);
    box-shadow: 0 18px 32px rgba(15, 23, 42, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(12px);
}

.contact-form-card h2,
.contact-info-card h2 {
    margin: 0 0 var(--spacing-sm);
    font-size: 1.1rem;
    letter-spacing: 0.05em;
}

.contact-form-desc {
    margin: 0 0 var(--spacing-lg);
    color: var(--text-light);
    font-size: 0.82rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.contact-form label {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text);
    letter-spacing: 0.03em;
}

.contact-form input,
.contact-form textarea {
    margin-top: var(--spacing-xs);
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 10px;
    border: 1px solid var(--border-light);
    background: rgba(255, 255, 255, 0.92);
    font-size: 0.9rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: rgba(79, 70, 229, 0.45);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.contact-info-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.contact-info-item {
    background: rgba(79, 70, 229, 0.06);
    border-radius: 16px;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 1px solid rgba(79, 70, 229, 0.12);
}

.contact-info-label {
    display: inline-block;
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--admin-accent-strong);
    margin-bottom: var(--spacing-xs);
}

.contact-info-value {
    margin: 0;
    font-size: 0.85rem;
    color: var(--text);
    line-height: 1.6;
}

.contact-meta {
    margin-top: var(--spacing-xl);
    font-size: 0.85rem;
    color: var(--text-light);
    line-height: 1.6;
}

.contact-meta a {
    color: var(--admin-accent-strong);
    text-decoration: underline;
}

.contact-meta-note {
    margin-top: var(--spacing-sm);
    font-size: 0.78rem;
    color: var(--text-muted);
}

@media (max-width: 1024px) {
    .contact-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
}

@media (max-width: 768px) {
    .contact-hero-inner h1 {
        font-size: 1.4rem;
    }

    .contact-form-card,
    .contact-info-card {
        padding: var(--spacing-xl);
    }
}

@media (max-width: 480px) {
    .contact-hero-inner {
        padding: 0 var(--spacing-md);
    }

    .contact-form-card,
    .contact-info-card {
        padding: var(--spacing-lg);
        border-radius: 16px;
    }
}

/* 后台管理界面 */
.admin-wrapper {
    display: grid;
    grid-template-columns: 160px minmax(0, 1fr);
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    align-items: flex-start;
    border-radius: var(--border-radius);
    padding: var(--spacing-xxl);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    border: 1px solid #dbcec3;
    background: rgba(255, 255, 255);
}

.admin-sidebar {
    position: sticky;
    top: 100px;
    align-self: start;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.admin-sidebar-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.admin-sidebar-logo {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background: rgba(18, 20, 21, 0.06);
    display: grid;
    place-items: center;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--text);
}

.admin-sidebar-meta {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.admin-sidebar-title {
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--text);
}

.admin-sidebar-subtitle {
    font-size: 0.7rem;
    color: var(--text-light);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.admin-menu {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.admin-menu-item a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    border-radius: 10px;
    color: var(--text-light);
    font-size: 0.88rem;
    letter-spacing: 0.02em;
    transition: background 0.2s ease, color 0.2s ease;
}

.admin-menu-item.is-active a,
.admin-menu-item a:hover {
    background: rgba(18, 20, 21, 0.08);
    color: var(--text);
    padding: var(--spacing-sm) var(--spacing-md);
}

.admin-sidebar-footer {
    margin-top: auto;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.sidebar-user {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.avatar {
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: rgba(18, 20, 21, 0.06);
    display: grid;
    place-items: center;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--text);
}

.sidebar-user-info {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.sidebar-user-name {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text);
}

.sidebar-user-role {
    font-size: 0.72rem;
    color: var(--text-light);
    letter-spacing: 0.08em;
}

.sidebar-logout {
    color: var(--text-light);
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.sidebar-logout:hover {
    color: var(--text);
    text-decoration: underline;
}



.admin-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
}

.admin-subtitle {
    margin: 0 0 var(--spacing-xs);
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.admin-description {
    margin-top: var(--spacing-xs);
    color: var(--text-light);
    font-size: 0.85rem;
    max-width: 460px;
}

.admin-panel h1 {
    margin: 0;
    font-size: 1.25rem;
    letter-spacing: 0.04em;
}

.admin-panel .admin-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.admin-panel label,
.admin-panel .form-group label {
    font-size: 0.82rem;
    color: var(--text);
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.admin-panel input,
.admin-panel textarea,
.admin-panel select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-light);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.94);
    font-size: 0.9rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.admin-panel input:focus,
.admin-panel textarea:focus,
.admin-panel select:focus {
    outline: none;
    border-color: rgba(18, 20, 21, 0.3);
    box-shadow: 0 0 0 3px rgba(18, 20, 21, 0.1);
}

.admin-panel textarea {
    resize: vertical;
    min-height: 120px;
}

.admin-form-actions,
.form-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
    margin-top: var(--spacing-lg);
}

.form-hint {
    margin-top: 4px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.required {
    color: #d64545;
}

.table-wrapper {
    border-radius: 12px;
    border: 1px solid var(--border-light);
    background: rgba(255, 255, 255, 0.98);
    overflow: hidden;
    box-shadow: 0 8px 20px rgba(18, 20, 21, 0.05);
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.table thead th {
    text-align: left;
    background: rgba(18, 20, 21, 0.05);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text);
    font-weight: 600;
    letter-spacing: 0.04em;
    white-space: nowrap;
}

.table tbody td {
    padding: var(--spacing-md);
    vertical-align: top;
    /* border-bottom: 1px solid rgba(209, 217, 224, 0.7); */
    background: rgba(255, 255, 255, 0.96);
    white-space: normal;      /* 允许换行 */
}

/* 仅限制第一列（通常是书名）宽度，超过 10 个字换行，其他列自适应 */
.table tbody td:first-child .title-ellipsis {
    display: inline-block;
    /* max-width: 10em;  */
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: normal;       /* 允许换行 */
    overflow-wrap: anywhere;   /* 强制长词/连续字符换行 */
    word-break: break-all;
}

/* 产品管理表格：除第一列外，其他列禁止换行 */
.admin-table tbody td:not(:first-child) {
    white-space: nowrap;
}

.table tbody tr:last-child td {
    border-bottom: none;
}

.table tbody tr:hover td {
    background: rgba(18, 20, 21, 0.05);
}

.actions-cell {
    display: inline-flex;
    align-items: center;
    flex-wrap: nowrap;
    gap: var(--spacing-xs);
    white-space: nowrap;
}

.actions-cell form {
    display: inline;
}

.actions-divider {
    margin: 0 var(--spacing-xs);
    color: var(--text-light);
}

.inline-form {
    display: inline;
}

.link-button {
    background: none;
    border: none;
    padding: 0;
    color: var(--text-light);
    cursor: pointer;
    font-size: 0.8rem;
    text-decoration: underline;
}

.link-button:hover {
    color: var(--text);
}

.text-danger {
    color: #d64545;
}

.status-pill {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    border-radius: 999px;
    font-size: 0.7rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.status-pill.is-warning {
    background: rgba(18, 20, 21, 0.08);
    color: var(--text);
}

.status-pill.is-success {
    background: rgba(18, 20, 21, 0.12);
    color: var(--text);
}

.message-stats {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    color: var(--text-light);
    font-size: 0.85rem;
}

.admin-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.admin-card {
    padding: var(--spacing-xl);
    border-radius: 16px;
    border: 1px solid var(--border-light);
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 10px 24px rgba(18, 20, 21, 0.06);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.admin-card-top {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
}

.admin-tag {
    font-size: 0.7rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-light);
}

.admin-metric {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text);
}

.admin-card-text {
    margin: 0;
    color: var(--text-light);
    font-size: 0.85rem;
}

.admin-card-actions {
    display: flex;
    justify-content: flex-end;
}

.admin-section {
    margin-top: var(--spacing-xl);
}

.admin-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.admin-section h2 {
    margin: 0;
    font-size: 1rem;
}

.admin-section-meta {
    font-size: 0.78rem;
    color: var(--text-light);
    letter-spacing: 0.06em;
}

@media (max-width: 1024px) {
    .admin-wrapper {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .admin-sidebar {
        position: static;
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        padding: var(--spacing-lg) var(--spacing-xl);
    }

    .admin-menu {
        flex-direction: row;
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }

    .admin-menu-item a {
        font-size: 0.82rem;
    }
}

@media (max-width: 768px) {
    .admin-sidebar {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-md);
    }

    .admin-menu {
        width: 100%;
        overflow-x: auto;
        padding-bottom: var(--spacing-sm);
    }

    .admin-panel {
        padding: var(--spacing-xl);
    }
}

@media (max-width: 480px) {
    .admin-sidebar {
        padding: var(--spacing-lg);
        border-radius: 14px;
    }

    .admin-panel {
        padding: var(--spacing-lg);
        border-radius: 14px;
    }
}
.admin-auth {
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xxl) var(--spacing-lg);
}

.admin-auth-card {
    width: min(400px, 92vw);
    background: #fff;
    padding: var(--spacing-xxl) var(--spacing-xxl);
    border-radius: 14px;
    border: 1px solid #e9ecef;
    box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}

.admin-auth-card h1 {
    margin: 4px 0 2px 0;
    font-size: 1.4rem;
    font-weight: 600;
    text-align: center;
}

.admin-auth-card .admin-form { margin-top: var(--spacing-xxl); gap: var(--spacing-xl); }
.admin-auth-card label { font-size: 0.9rem; color: var(--text); }
.admin-auth-card input[type="text"],
.admin-auth-card input[type="password"] {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #e5e7eb;
    border-radius: 10px;
}
.admin-auth-card input[type="text"]:focus,
.admin-auth-card input[type="password"]:focus {
    outline: none;
    border-color: #cbd5e1;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.08);
}

/* 额外元素（logo与说明） */
.auth-header { text-align: center; }
.auth-logo { width: 44px; opacity: .95; }
.auth-row { display: grid; grid-template-columns: 76px 1fr; align-items: center; gap: 12px; margin-bottom: 16px; }
.auth-row label { font-weight: 600; }
.auth-row input { width: 100%; }
.auth-actions { margin-top: 16px; display: flex; justify-content: center; }
.auth-submit { padding: 8px 18px; border-radius: 10px; font-size: 0.95rem; }
.auth-hint { text-align: center; color: var(--text-muted); font-size: 12px; margin-top: 10px; display: none; }

@media (max-width: 560px) {
    .admin-auth { padding: var(--spacing-xl) var(--spacing-sm); }
    .admin-auth-card { padding: 24px 20px; border-radius: 12px; }
    .auth-row { grid-template-columns: 72px 1fr; gap: 12px; margin-bottom: 14px; }
    .auth-submit { padding: 8px 16px; }
}
.nav-links a {
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    color: var(--text-light);
    transition: color 0.2s ease;
    text-transform: uppercase;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text);
    opacity: 1;
}


/* 轮播图样式 */
.carousel-container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    margin-top: var(--spacing-xl);
}

.carousel-wrapper {
    position: relative;
    width: 100%;
    height: 300px;
    /* overflow: hidden; */
    border-radius: var(--border-radius);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.carousel-slides {
    position: relative;
    width: 100%;
    height: 100%;
}

.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
}

.carousel-slide.active {
    opacity: 1;
}

.carousel-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.carousel-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
    padding: var(--spacing-xxl) var(--spacing-lg) var(--spacing-lg);
    color: white;
}

.carousel-title {
    font-size: 1rem;
    font-weight: 600;
    margin: 0 0 var(--spacing-sm);
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

.carousel-description {
    font-size: 1rem;
    margin: 0;
    opacity: 0.9;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.8);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text);
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 10;
}

.carousel-btn:hover {
    background: rgba(255, 255, 255, 0.95);
    transform: translateY(-50%) scale(1.1);
}

.carousel-prev {
    left: -60px;
}

.carousel-next {
    right: -60px;
}

.carousel-indicators {
    position: absolute;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--spacing-sm);
    z-index: 10;
}

.carousel-indicator {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all 0.3s ease;
}

.carousel-indicator.active {
    background: rgba(255, 255, 255, 0.9);
    transform: scale(1.2);
}

.carousel-indicator:hover {
    background: rgba(255, 255, 255, 0.8);
}

/* 主要内容区域 */
.main-content {
    padding: 0 var(--spacing-lg);
}

/* 首页书柜布局 */
.bookshelf-container {
    position: relative;
    margin: 0 auto;
}

/* 面包屑 */
.breadcrumb {
    width: var(--container-width);
    margin: 20px auto 0 auto;
    font-size: 0.8rem;
    color: var(--text-light);
    padding: var(--spacing-md) 0;
}
.breadcrumb a { color: var(--text-light); }
.breadcrumb .sep { margin: 0 6px; color: var(--text-muted); }
.breadcrumb .current { 
    color: var(--text);
    /* max-width: 30em;
    display: inline-block;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    position: relative;
    top: 5px; */
}

.bookshelf-header {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.bookshelf-title {
    font-size: 1rem;
    font-weight: 300;
    letter-spacing: 0.03em;
    margin: 0 0 var(--spacing-sm);
    color: var(--text);
}

.bookshelf-subtitle {
    font-size: 0.9rem;
    color: var(--text-light);
    margin: 0;
    letter-spacing: 0.01em;
    line-height: 1.6;
}

.bookshelf-year-section {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}
/* 书柜架子 */
.bookshelf {
    width: var(--container-width);
    margin: 0 auto;
}
@media (max-width: 820px) {
    .bookshelf { width: 100%; max-width: 100%; }
}

/* 书柜主题高亮文字 */
.shelf-theme-highlight {
    text-align: center;
    font-size: 0.8rem;
    font-weight: 400;
    margin-bottom: var(--spacing-xl);
    position: relative;
    padding: var(--spacing-sm) 0;
    line-height: 1.4;
}


.shelf-title {
    font-size: 0.8rem;
    color: var(--text-light);
    margin: 0 0 var(--spacing-sm);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    text-align: center;
}

.shelf-theme {
    font-size: 1rem;
    font-weight: 400;
    color: var(--text);
    margin: 0 0 var(--spacing-xl);
    letter-spacing: 0.01em;
    line-height: 1.4;
    text-align: center;
}

/* 图书网格 - 每行5本书 */
.books-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    border: 1px solid #dbcec3;
    /* background: url(../bg_wall.jpg) repeat; */
    background-blend-mode: darken;
    background-color: rgb(255 255 255 / 66%);
    box-shadow: inset 0px 20px 35px rgba(0, 0, 0, 0.08); 
    border-radius: var(--border-radius);
}

/* 外层阴影容器，用于承载整组书格 */
.books-grid-wrapper {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border-radius: var(--border-radius);
}

.book-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
    align-items: start;
    justify-items: center;
    position: relative;
    padding-bottom: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    

    
}

.book-row::after {
    content: "";
    display: block;
    height: 8px;
    background-color: #f0f0f0;
    position: absolute;
    bottom: 0;
    left: -32px;
    right: -32px;
    box-shadow: 0px 2px 0px #ababab;
}

.book-card {
    transition: transform 0.2s ease;
    text-align: center;
    width: 100%;
    max-width: 140px;
    position: relative;
    bottom: -22px;
    z-index: 999;
}

.book-card:hover {
    transform: translateY(-2px);
}

.book-image {
    width: 80%;
    aspect-ratio: 2/3;
    object-fit: cover;
}

.book-title {
    margin: 0;
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.01em;
    line-height: 1.3;
    color: var(--text);
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 1rem;
}

.book-author {
    margin: var(--spacing-xs) 0 0;
    font-size: 0.7rem;
    color: var(--text-light);
    letter-spacing: 0.01em;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-publisher {
    margin: var(--spacing-xs) 0 0;
    font-size: 0.65rem;
    color: var(--text-muted);
    letter-spacing: 0.01em;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-date {
    margin: var(--spacing-xs) 0 0;
    font-size: 0.65rem;
    color: var(--text-muted);
    letter-spacing: 0.01em;
}

/* 产品详情页 */
.product-detail-container {
    max-width: var(--container-width);
    margin: 0 auto;
    margin-top: var(--spacing-xl);
    background-blend-mode: darken;
    background-color: rgb(255 255 255 / 66%);
    box-shadow: inset 0px 20px 35px rgba(0, 0, 0, 0.08);
    border-radius: var(--border-radius);
}

.product-detail-layout {
    display: grid;
    grid-template-columns: 1.5fr 1.5fr;
    gap: var(--spacing-xxl);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius);
    padding: var(--spacing-xxl);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    border: 1px solid #dbcec3;
}

/* 产品图片区域 */
.product-image-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.main-product-image {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
}

.product-image-main {
    width: 100%;
    max-width: 220px;
    aspect-ratio: 2 / 3;
    object-fit: cover;
}

/* 书图下方的极简购买按钮 */
.buy-cta-under-image {
    display: flex;
    justify-content: center;
}

.buy-btn-minimal {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    font-size: 0.85rem;
    color: #333;
    background: #ffd700;
    border: 1px solid #e6c600;
    border-radius: 999px;
    text-decoration: none;
    transition: transform .15s ease, background-color .2s ease;
}

.buy-btn-minimal:hover { 
    background: #ffe250;
    transform: translateY(-1px);
}

.buy-btn-minimal.outline {
    background: transparent;
    border-color: var(--border);
}

.buy-btn-minimal.outline:hover {
    background: rgba(0,0,0,.04);
}

.product-image-placeholder {
    width: 100%;
    max-width: 300px;
    aspect-ratio: 2 / 3;
    background: var(--shelf-bg);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}
.current-image img{
    width: 40%;
    height: 40%;
    object-fit: cover;
}                           
.icp{
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-light);
    margin: 0;
    letter-spacing: 0.01em;
/* 图片上下绝对居中 */
.main-product-image {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 400px; /* 可根据实际图片区域高度调整 */
    position: relative;
}
.product-image-main,
.product-image-placeholder {
    margin: 0 auto;
    align-self: center;
}
}
.product-thumbnails {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
}

.thumbnail {
    width: 60px;
    height: 80px;
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    overflow: hidden;
    cursor: pointer;
    transition: border-color 0.2s ease;
}

.thumbnail.active {
    border-color: var(--accent);
}

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

.thumbnail-placeholder {
    width: 100%;
    height: 100%;
    background: var(--shelf-bg);
}

/* 产品信息区域 */
.product-info-section {
    display: block;
}

/* 让右侧留言区域在卡片内上下居中 */
.contact-form-section {
    display: block;
}

.product-title {
    font-family: var(--font-main);
    font-size: 1.4rem;
    font-weight: bold;
    color: var(--text);
    margin: 0;
    line-height: 1.3;
    margin: 30px auto;
}

/* 详情页标题副标题（括号内） */
.title-sub {
    font-size: 1rem !important;
}

.product-description {

    position: relative;
    /* top: -40px; */
}

.product-description p {
    margin-bottom: var(--spacing-md);
    line-height: 20px;
    font-size: .8rem;
}

/* 图书详细信息 */
.book-details {
    border-radius: var(--border-radius);
    /* padding: var(--spacing-lg); */
}

.book-details h3 {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text);
    margin: 0 0 var(--spacing-md);
}

.detail-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
    border: 1px solid #666;
    padding: 20px;
    margin-right: 50px;
    margin-top: 60px;
    background-color: #fff;
}

.detail-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.detail-label {
    font-size: 0.85rem;
    color: var(--text-light);
    font-weight: 500;
    min-width: 80px;
}

.detail-value {
    font-size: 0.85rem;
    color: var(--text);
}

/* 购买区域 */
.purchase-section {
    border-top: 1px solid var(--border-light);
    padding-top: var(--spacing-lg);
}

.price-section {
    margin-bottom: var(--spacing-lg);
}

.price {
    font-size: 2rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: var(--spacing-sm);
}

.payment-info {
    margin-bottom: var(--spacing-sm);
}

.payment-option {
    font-size: 0.85rem;
    color: var(--text-light);
}

.tax-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.tax-info span {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.quantity-section {
    margin-bottom: var(--spacing-lg);
}

.quantity-section label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-xs);
}

.quantity-select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-light);
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    background: var(--card-bg);
    color: var(--text);
}

.add-to-cart-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: #ffd700;
    color: #333;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: background-color 0.2s ease;
    width: 100%;
}

.add-to-cart-btn:hover {
    background-color: #ffed4e;
    opacity: 1;
}

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

.contact-btn:hover {
    background-color: #1f3040;
}

/* 相关图书 */
.related-products-section {
    margin-top: var(--spacing-xxl);
    padding-top: var(--spacing-xxl);
    border-top: 1px solid var(--border-light);
    width: 100%;
    max-width: var(--container-width);
    margin-left: auto;
    margin-right: auto;
}

/* 移动端隐藏轮播文案 */
@media (max-width: 820px) {
    .carousel-content { display: none !important; }
}

.related-products-section h2 {
    font-family: var(--font-main);
    font-size: 1rem;
    font-weight: normal;
    color: var(--text);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.related-books-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.related-book-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-md);
    align-items: start;
    justify-items: center;
    position: relative;
    padding-bottom: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.related-book-row::after {
    content: "";
    display: block;
    height: 8px;
    background-color: #f0f0f0;
    position: absolute;
    bottom: 0;
    left: -32px;
    right: -32px;
    box-shadow: 0px 2px 0px #ababab;
}

.related-book-card {
    width: 100%;
    max-width: 140px;
    position: relative;
    bottom: -22px;
    z-index: 999;
}

.related-book-card:hover {
    transform: translateY(-2px);
    opacity: 1;
}

.related-book-card .book-card {
    transition: transform 0.2s ease;
}

.related-book-card:hover .book-card {
    transform: translateY(-2px);
}

.product-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xxl);
}

.product-image-container {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    text-align: center;
}

.product-image-detail {
    width: 100%;
    max-width: 300px;
    aspect-ratio: 2/3;
    object-fit: cover;
    border-radius: var(--border-radius);
    margin: 0 auto;
    display: block;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.product-info {
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
}

.product-title-detail {
    font-size: 1.2rem;
    font-weight: 400;
    margin: 0 0 var(--spacing-md);
    letter-spacing: 0.02em;
    line-height: 1.4;
}

.product-author-detail {
    font-size: 0.85rem;
    color: var(--text-light);
    margin: 0 0 var(--spacing-lg);
}

.product-description {
    padding: 0 50px 0 0;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text);
    margin: 0 0 var(--spacing-lg);
}
.product-description p {
    margin: 0;
}

/* 询问按钮 */
.inquiry-cta { margin: var(--spacing-lg) 0 var(--spacing-xl); }
.inquiry-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: #f7f7f7;
    border: 1px solid #dddddd;
    border-radius: 10px;
    color: #555;
    text-decoration: none;
    font-size: 0.95rem;
    transition: background .2s ease, box-shadow .2s ease, transform .1s ease;
}
.inquiry-btn:hover {
    background: #fafafa;
    box-shadow: 0 2px 6px rgba(0,0,0,.06);
    transform: translateY(-1px);
}
.inquiry-icon { color: #9aa0a6; }
.product-meta {
    font-size: 0.75rem;
    color: var(--text-light);
    margin: var(--spacing-lg) 0;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-light);
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--accent);
    color: var(--card-bg);
    border: none;
    border-radius: var(--border-radius);
    font-size: 0.8rem;
    letter-spacing: 0.02em;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn:hover {
    background: var(--text);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-outline:hover {
    background: var(--shelf-bg);
    border-color: var(--accent);
}

.btn-ghost {
    background: transparent;
    color: var(--text-light);
    border: 1px solid transparent;
}

.btn-ghost:hover {
    border-color: var(--border);
    color: var(--text);
    background: rgba(18, 20, 21, 0.05);
}

.btn-secondary {
    background: rgba(18, 20, 21, 0.08);
    color: var(--text);
}

.btn-secondary:hover {
    background: rgba(18, 20, 21, 0.12);
}

.admin-panel .btn-ghost {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-light);
}

.admin-panel .btn-ghost:hover {
    border-color: var(--text);
    color: var(--text);
    background: rgba(18, 20, 21, 0.04);
}

.admin-panel .btn,
.admin-panel .btn-ghost,
.admin-panel .btn-secondary,
.admin-auth-card .btn {
    font-weight: 600;
    box-shadow: none;
}

/* 表单样式 */
.form-group {
    margin-bottom: var(--spacing-lg);
}

/* 两列栅格，便于并排编辑元数据 */
.admin-grid-two {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--spacing-xl);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-size: 0.8rem;
    color: var(--text);
    letter-spacing: 0.01em;
}

.form-input,
.form-textarea {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 0.8rem;
    background: var(--card-bg);
    transition: border-color 0.2s ease;
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.form-textarea {
    resize: vertical;
    min-height: 80px;
}

/* 页面标题 */
.page-header {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
    padding: var(--spacing-xl) 0;
}

.page-subtitle {
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-light);
    margin: 0 0 var(--spacing-md);
}

.page-header h1 {
    margin: 0 0 var(--spacing-sm);
    font-size: 1.4rem;
    font-weight: 300;
    letter-spacing: 0.03em;
    color: var(--text);
}

.page-header p {
    margin: 0;
    font-size: 0.85rem;
    color: var(--text-light);
    letter-spacing: 0.01em;
}

/* 消息提示 */
.flash-messages {
    position: fixed;
    top: 80px;
    right: var(--spacing-lg);
    z-index: 1001;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.flash {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: 0.75rem;
    max-width: 200px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transform: translateX(100%);
    opacity: 0;
    transition: all 0.3s ease;
}

.flash.show {
    transform: translateX(0);
    opacity: 1;
}

.flash.success {
    background: #f0f9f0;
    color: #2d5a2d;
    border: 1px solid #c3e6c3;
}

.flash.error {
    background: #fef0f0;
    color: #8a1f17;
    border: 1px solid #f5c6c6;
}

/* 页脚 */
.site-footer {
    padding: 50px 0;
    text-align: center;
    font-size: 0.7rem;
    color: var(--text-muted);
    letter-spacing: 0.01em;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .carousel-container {
        padding: var(--spacing-lg) var(--spacing-md) 0;
    }
    
    .carousel-wrapper {
        height: 250px;
    }
    
    .carousel-title {
        font-size: 1.3rem;
    }
    
    .carousel-description {
        font-size: 0.9rem;
    }
    
    .book-row {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .brand-tagline {
        display: none;
    }
}

.brand-info-layout .product-description {
    font-size: 0.8rem;
}
.brand-info-layout .product-description p {
    margin-bottom: var(--spacing-md);
}
@media (max-width: 768px) {
    .carousel-container {
        padding: 0;
    }
    
    .carousel-wrapper {
        height: 170px;
    }
    
    .carousel-title {
        font-size: 1.1rem;
    }
    
    .carousel-description {
        font-size: 0.8rem;
    }
    
    .carousel-btn {
        width: 35px;
        height: 35px;
        font-size: 1.2rem;
    }
    
    .carousel-indicator {
        width: 10px;
        height: 10px;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .main-content {
        margin-top: 70px;
    }
    
    .nav-content {
        padding: 0 var(--spacing-md);
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .brand-section {
        justify-content: center;
    }
    
    .brand-logo {
        width: 50px;
    }
    
    .brand-title {
        font-size: 1.2rem;
    }
    
    .brand-subtitle {
        font-size: 0.7rem;
    }
    
    .nav-section {
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: var(--spacing-lg);
        width: 100%;
    }

    .nav-links {
        gap: var(--spacing-lg);
    }

    .nav-links a {
        font-size: 0.8rem;
    }

    .nav-search {
        width: 100%;
        justify-content: center;
    }

    .nav-search input[type="search"] {
        width: min(320px, 100%);
    }

    .bookshelf-title {
        font-size: 1.4rem;
    }

    .book-row {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }
    
    .product-detail-layout {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .related-book-row {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .product-image-detail {
        max-width: 200px;
    }
}

@media (max-width: 480px) {
    .main-content {
        margin-top: 0px;
    }
    
    .nav-content {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .brand-section {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }
    
    .brand-logo {
        width: 40px;
    }
    
    .brand-title {
        font-size: 1rem;
    }
    
    .nav-section {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-sm);
    }
    
    .nav-search {
        width: 100%;
    }

    .nav-search input[type="search"] {
        width: min(260px, 100%);
    }


    .book-row {
        grid-template-columns: repeat(1, 1fr);
    }

    .related-book-row {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .bookshelf-title {
        font-size: 1rem;
    }
    
    .product-title-detail {
        font-size: 1rem;
    }
}

/* 显示全部按钮 */
.show-all-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: calc(var(--spacing-sm) + 2px) calc(var(--spacing-lg) + 2px);
    background: #ffffff;
    color: var(--text);
    border: 1px solid #d7dee5;
    border-radius: 999px;
    font-size: 0.9rem;
    letter-spacing: 0.04em;
    text-decoration: none;
    transition: background-color .2s ease, color .2s ease, box-shadow .2s ease, transform .12s ease;
    cursor: pointer;
    margin-top: var(--spacing-lg);
    box-shadow: 0 2px 6px rgba(0,0,0,0.06);
}

.show-all-btn:hover {
    background: #f7fafc;
    box-shadow: 0 6px 14px rgba(0,0,0,0.08);
    transform: translateY(-1px);
}

.show-all-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(0,0,0,0.05);
}

.show-all-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(99,102,241,0.12);
}



/* 工具类 */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

@media (max-width: 1024px) {
    .container { padding-left: 16px; padding-right: 16px; }
}

@media (max-width: 820px) {
    .book-image { width: 60%; }
    /* 顶部导航栅格优化 */
    .main-nav .nav-content { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; padding: 8px 12px; }
    .main-nav .nav-section { width: 100%; display: flex; flex-direction: column; gap: 10px; }
    .main-nav .nav-links { display: flex; gap: 14px; overflow-x: auto; -webkit-overflow-scrolling: touch; }
    .main-nav .nav-search { display: flex; gap: 8px; width: 100%; }
    .main-nav .nav-search input[type="search"] { flex: 1 1 auto; min-width: 0; }

    /* 主内容边距 */
    .main-content { padding-left: 12px; padding-right: 12px; }

    /* 书架分组网格 */
    .books-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--spacing-md); }
    .book-row { grid-template-columns: repeat(2, 1fr); }
    .related-book-row { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
    .books-grid { grid-template-columns: 1fr; }image.png
}

/* 产品详情左右区块在移动端纵向排列 */
@media (max-width: 820px) {
    .product-detail-container { padding: 0 2px; }
    .product-detail-layout { display: block; }
    .product-image-section, .product-info-section { width: 100% !important; }
    .product-image-main { max-width: 50%; height: auto; }
    .detail-grid { margin: 0;}
    .product-description {padding: 0;}
}

/* 后台侧栏与表单在窄屏折行 */
@media (max-width: 992px) {
    .admin-wrapper { display: block; }
    .admin-sidebar { position: static; width: auto; max-width: none; border-right: 0; border-bottom: 1px solid var(--border); }
    .admin-panel { width: 100%; }
}

@media (max-width: 820px) {
    .admin-panel-header { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
    .admin-panel-header h1 { font-size: 20px; }
    .admin-grid-two { display: grid; grid-template-columns: 1fr; gap: 10px; }
    .admin-form-actions { display: flex; flex-wrap: wrap; gap: 10px; }
}

/* 后台表格横向滚动，避免挤压 */
.table-wrapper { overflow-x: auto; -webkit-overflow-scrolling: touch; }
@media (max-width: 820px) {
    .table { min-width: 640px; }
}

/* 移动端卡片保持原有横向网格，不做特殊调整 */

/* 小屏继承默认布局 */

/* 移动端不重写 .bookshelf-year-section 的卡片布局，沿用默认横排自动换行 */

/* 移除移动端对 .bookshelf-year-section 的列数与图片尺寸改写 */

/* —— 移动端宽度修正，防止卡片过宽或产生横向滚动 —— */
@media (max-width: 820px) {
    html, body { overflow-x: hidden; }
    .bookshelf-container { padding-left: 8px; padding-right: 8px; box-sizing: border-box; }
}

@media (max-width: 560px) {
    .bookshelf-container { padding-left: 6px; padding-right: 6px; }
}

/* 去除卡片子元素在移动端的强制排序规则，恢复默认文档流 */

/* 移动端：书列表单列且无分隔条 */
@media (max-width: 820px) {
  .book-row::after { display: none !important; }
}

/* 移动端：隐藏顶部搜索框，logo在左，导航在右，logo更大 */
@media (max-width: 820px) {
  .main-nav .nav-content { display: flex; align-items: center; justify-content: space-between; padding: 8px 12px; }
  .brand-section { order: 0; }
  .brand-logo { width: 56px; }
  .main-nav .nav-section { order: 1; width: auto; display: flex; align-items: center; gap: 12px; }
  .main-nav .nav-search { display: none !important; }
  .main-nav .nav-links { display: flex; gap: 14px; }
}

/* 移动端：导航左右排列（覆盖早前栅格设置） */
@media (max-width: 820px) {
  .main-nav .nav-content { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 8px 12px; }
  .brand-section { order: 0; display: flex; align-items: center; }
  .brand-logo { width: 120px; }
  .main-nav .nav-section { order: 1; display: flex; align-items: center; gap: 16px; width: auto; flex-direction: row; }
  .main-nav .nav-links { display: flex; gap: 16px; overflow: visible; }
}