/* ===== 设计系统 · 靛青科技风 ===== */
:root {
    --brand-dark: #1e1b4b;
    --brand-primary: #4338ca;
    --brand-light: #6366f1;
    --brand-accent: #06b6d4;
    --brand-warm: #f97316;
    --bg-page: #f8fafc;
    --bg-alt: #f1f5f9;
    --bg-card: #ffffff;
    --text-main: #0f172a;
    --text-body: #334155;
    --text-muted: #64748b;
    --text-inverse: #ffffff;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --radius: 10px;
    --radius-sm: 6px;
    --shadow: 0 1px 3px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
    --header-h: 68px;
    --container: 1140px;
    --gap: 1.25rem;
    --transition: 0.25s ease;
}

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-body);
    background: var(--bg-page);
    overflow-x: hidden;
    word-wrap: break-word;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--brand-primary);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--brand-accent);
}

.z77f4econtainer {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 1.25rem;
}

/* ===== 头部导航 ===== */
.z77f4eheader {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-h);
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.z77f4eheader-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-h);
    gap: 1rem;
}

.z77f4elogo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    flex-shrink: 0;
    min-width: 0;
}

.z77f4elogo-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
    flex-shrink: 0;
}

.z77f4elogo-text {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--brand-dark);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 200px;
}

.z77f4enav ul {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-end;
    gap: 0.25rem 0.15rem;
    list-style: none;
}

.z77f4enav a {
    display: block;
    padding: 0.45rem 0.75rem;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-body);
    border-radius: var(--radius-sm);
    white-space: nowrap;
}

.z77f4enav a:hover,
.z77f4enav .z77f4ethis a,
.z77f4enav li.z77f4ethis a {
    color: var(--brand-primary);
    background: rgba(67, 56, 202, 0.08);
}

.z77f4emobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 8px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    cursor: pointer;
    flex-shrink: 0;
}

.z77f4emobile-menu-btn span {
    display: block;
    height: 2px;
    background: var(--brand-dark);
    border-radius: 1px;
    transition: var(--transition);
}

/* ===== 按钮 ===== */
.z77f4ebtn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.65rem 1.4rem;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.z77f4ebtn-primary {
    background: var(--brand-primary);
    color: var(--text-inverse);
    border-color: var(--brand-primary);
}

.z77f4ebtn-primary:hover {
    background: var(--brand-dark);
    border-color: var(--brand-dark);
    color: var(--text-inverse);
}

.z77f4ebtn-outline {
    background: transparent;
    color: var(--text-inverse);
    border-color: rgba(255, 255, 255, 0.5);
}

.z77f4ebtn-outline:hover {
    background: rgba(255, 255, 255, 0.12);
    color: var(--text-inverse);
}

.z77f4ebtn-block {
    width: 100%;
}

/* ===== 首页 Hero ===== */
.z77f4ehero {
    margin-top: var(--header-h);
    padding: 3rem 0 0;
    background: linear-gradient(160deg, var(--brand-dark) 0%, #312e81 50%, var(--brand-primary) 100%);
    color: var(--text-inverse);
    overflow: hidden;
}

.z77f4ehero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 2.5rem;
    align-items: center;
    padding-bottom: 2.5rem;
}

.z77f4elabel {
    display: inline-block;
    padding: 0.3rem 0.85rem;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    background: rgba(6, 182, 212, 0.2);
    color: var(--brand-accent);
    border-radius: 50px;
    margin-bottom: 1rem;
}

.z77f4ehero-title {
    font-size: clamp(1.6rem, 4vw, 2.4rem);
    font-weight: 800;
    line-height: 1.3;
    color: var(--text-inverse);
    margin-bottom: 1rem;
}

.z77f4ehero-desc {
    font-size: 0.95rem;
    line-height: 1.85;
    opacity: 0.92;
    margin-bottom: 1.5rem;
}

.z77f4ehero-desc strong {
    color: #a5f3fc;
    font-weight: 600;
}

.z77f4ehero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.z77f4ehero-visual {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: rgba(255, 255, 255, 0.05);
}

.z77f4ehero-visual img {
    width: 100%;
    aspect-ratio: 4/3;
    object-fit: cover;
}

.z77f4ehero-badge {
    position: absolute;
    bottom: 1rem;
    left: 1rem;
    padding: 0.4rem 0.9rem;
    font-size: 0.82rem;
    font-weight: 600;
    background: var(--brand-warm);
    color: var(--text-inverse);
    border-radius: 50px;
}

.z77f4estats-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: -1.5rem;
    position: relative;
    z-index: 2;
    box-shadow: var(--shadow-md);
}

.z77f4estat {
    background: var(--bg-card);
    padding: 1.25rem 1rem;
    text-align: center;
}

.z77f4estat strong {
    display: block;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--brand-primary);
    line-height: 1.2;
}

.z77f4estat span {
    font-size: 0.82rem;
    color: var(--text-muted);
}

/* ===== 通用区块 ===== */
.z77f4esection {
    padding: 4rem 0;
}

.z77f4esection-alt {
    background: var(--bg-alt);
}

.z77f4esection-head {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 2.5rem;
}

.z77f4esection-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--brand-accent);
    margin-bottom: 0.5rem;
}

.z77f4esection-tag-light {
    color: #a5f3fc;
}

.z77f4esection-head h2 {
    font-size: clamp(1.4rem, 3vw, 1.85rem);
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 0.6rem;
}

.z77f4esection-head p {
    font-size: 0.92rem;
    color: var(--text-muted);
}

/* ===== 服务网格 ===== */
.z77f4eservice-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--gap);
}

.z77f4eservice-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: var(--transition);
}

.z77f4eservice-item:hover {
    border-color: var(--brand-light);
    box-shadow: var(--shadow-md);
}

.z77f4eservice-num {
    font-size: 2rem;
    font-weight: 800;
    color: rgba(67, 56, 202, 0.12);
    line-height: 1;
    margin-bottom: 0.75rem;
}

.z77f4eservice-item h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 0.6rem;
}

.z77f4eservice-item p {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.75;
}

.z77f4eservice-item strong {
    color: var(--brand-primary);
    font-weight: 600;
}

/* ===== 知识区 ===== */
.z77f4eknowledge-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: var(--gap);
    align-items: start;
}

.z77f4eknowledge-text h2 {
    font-size: clamp(1.3rem, 3vw, 1.75rem);
    font-weight: 800;
    color: var(--text-main);
    margin: 0.5rem 0 1rem;
}

.z77f4eknowledge-text p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    line-height: 1.85;
}

.z77f4eknowledge-text strong {
    color: var(--brand-primary);
    font-weight: 600;
}

.z77f4eknowledge-panel {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.z77f4eknowledge-panel h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-light);
}

.z77f4efaq-list {
    list-style: none;
}

.z77f4efaq-list li {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.7;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-light);
}

.z77f4efaq-list li:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.z77f4efaq-list strong {
    color: var(--text-main);
}

/* ===== 流程 ===== */
.z77f4eprocess-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--gap);
}

.z77f4eprocess-step {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    text-align: center;
}

.z77f4estep-icon {
    width: 40px;
    height: 40px;
    margin: 0 auto 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 800;
    color: var(--text-inverse);
    background: linear-gradient(135deg, var(--brand-primary), var(--brand-accent));
    border-radius: 50%;
}

.z77f4eprocess-step h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

.z77f4eprocess-step p {
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.65;
}

.z77f4eprocess-step strong {
    color: var(--brand-primary);
    font-weight: 600;
}

/* ===== 首页文章 ===== */
.z77f4ehome-article-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--gap);
}

.z77f4ehome-article-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
}

.z77f4ehome-article-card:hover {
    border-color: var(--brand-light);
    box-shadow: var(--shadow-md);
}

.z77f4ehome-article-thumb {
    aspect-ratio: 16/10;
    overflow: hidden;
    background: var(--bg-alt);
}

.z77f4ehome-article-thumb a,
.z77f4ehome-article-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.z77f4ehome-article-info {
    padding: 0.85rem;
}

.z77f4ehome-article-info h3 {
    font-size: 0.85rem;
    font-weight: 600;
    line-height: 1.45;
    margin-bottom: 0.4rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.z77f4ehome-article-info h3 a {
    color: var(--text-main);
}

.z77f4ehome-article-info h3 a:hover {
    color: var(--brand-primary);
}

.z77f4ehome-article-info time {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* ===== 联系区 ===== */
.z77f4esection-cta {
    background: linear-gradient(135deg, var(--brand-dark), #3730a3);
    color: var(--text-inverse);
    padding: 3.5rem 0;
}

.z77f4econtact-wrap {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: start;
}

.z77f4econtact-intro h2 {
    font-size: clamp(1.3rem, 3vw, 1.75rem);
    font-weight: 800;
    margin: 0.5rem 0 1rem;
}

.z77f4econtact-intro p {
    font-size: 0.9rem;
    opacity: 0.9;
    line-height: 1.8;
    margin-bottom: 1.25rem;
}

.z77f4econtact-intro strong {
    color: #a5f3fc;
}

.z77f4econtact-list {
    list-style: none;
}

.z77f4econtact-list li {
    display: flex;
    gap: 0.75rem;
    padding: 0.5rem 0;
    font-size: 0.88rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.z77f4econtact-list li span {
    flex: 0 0 72px;
    opacity: 0.7;
    font-size: 0.82rem;
}

.z77f4econtact-form {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.5rem;
    border: 1px solid var(--border);
}

.z77f4econtact-form h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 1rem;
}

.z77f4eform-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.z77f4econtact-form input,
.z77f4econtact-form textarea {
    width: 100%;
    padding: 0.65rem 0.85rem;
    font-size: 0.88rem;
    font-family: inherit;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-page);
    color: var(--text-main);
    margin-bottom: 0.75rem;
    transition: border-color var(--transition);
}

.z77f4econtact-form input:focus,
.z77f4econtact-form textarea:focus {
    outline: none;
    border-color: var(--brand-primary);
}

.z77f4econtact-form textarea {
    resize: vertical;
    min-height: 90px;
    margin-bottom: 1rem;
}

/* ===== 页脚 ===== */
.z77f4efooter {
    background: var(--brand-dark);
    color: rgba(255, 255, 255, 0.75);
    padding: 2.5rem 0 1.5rem;
}

.z77f4efooter-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.z77f4efooter-brand h5 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-inverse);
    margin-bottom: 0.75rem;
}

.z77f4efooter-brand p {
    font-size: 0.85rem;
    line-height: 1.7;
}

.z77f4efooter-links h4 {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-inverse);
    margin-bottom: 0.85rem;
}

.z77f4efooter-links ul {
    list-style: none;
}

.z77f4efooter-links li {
    margin-bottom: 0.45rem;
}

.z77f4efooter-links a {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.65);
}

.z77f4efooter-links a:hover {
    color: var(--brand-accent);
}

.z77f4efooter-bottom {
    text-align: center;
    padding-top: 1.25rem;
}

.z77f4efooter-bottom p {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.45);
    margin-bottom: 0.25rem;
}

.z77f4efooter-bottom a {
    color: rgba(255, 255, 255, 0.7);
}

/* ===== 友情链接 ===== */
.z77f4efriend-links {
    background: var(--bg-alt);
    padding: 1.25rem 0;
    border-top: 1px solid var(--border);
}

.z77f4efriend-links h4 {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.z77f4efriend-links ul {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
    list-style: none;
}

.z77f4efriend-links a {
    font-size: 0.82rem;
    color: var(--text-muted);
}

.z77f4efriend-links a:hover {
    color: var(--brand-primary);
}

/* ===== 内页 / 列表页 ===== */
.z77f4epage-banner {
    margin-top: var(--header-h);
    padding: 2rem 0;
    background: linear-gradient(135deg, var(--brand-dark), var(--brand-primary));
    color: var(--text-inverse);
}

.z77f4ebreadcrumb {
    font-size: 0.85rem;
    opacity: 0.85;
    margin-bottom: 0.5rem;
}

.z77f4ebreadcrumb a {
    color: var(--text-inverse);
}

.z77f4ebreadcrumb a:hover {
    color: var(--brand-accent);
}

.z77f4ebreadcrumb-sep {
    margin: 0 0.4rem;
    opacity: 0.5;
}

.z77f4ebreadcrumb-current {
    opacity: 0.75;
}

.z77f4epage-title {
    font-size: clamp(1.3rem, 3vw, 1.75rem);
    font-weight: 800;
}

.z77f4emain-section {
    padding: 2rem 0 3rem;
}

.z77f4emain-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: var(--gap);
    align-items: start;
}

.z77f4emain-content {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    min-width: 0;
    overflow: hidden;
}

/* 文章详情 */
.z77f4earticle-header {
    padding-bottom: 1.25rem;
    margin-bottom: 1.25rem;
    border-bottom: 1px solid var(--border);
}

.z77f4earticle-title {
    font-size: clamp(1.25rem, 3vw, 1.65rem);
    font-weight: 800;
    color: var(--text-main);
    line-height: 1.4;
    margin-bottom: 0.75rem;
}

.z77f4earticle-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.25rem;
    font-size: 0.82rem;
    color: var(--text-muted);
}

.z77f4earticle-meta a {
    color: var(--brand-primary);
}

.z77f4earticle-thumb {
    margin-bottom: 1.25rem;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--border);
}

.z77f4earticle-body {
    font-size: 0.95rem;
    line-height: 1.9;
    color: var(--text-body);
    overflow-wrap: break-word;
}

.z77f4earticle-body img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
    margin: 0.75rem 0;
}

.z77f4ediyfield {
    margin-top: 1.25rem;
    padding-top: 1.25rem;
    border-top: 1px dashed var(--border);
}

.z77f4earticle-images img {
    max-width: 100%;
    border-radius: var(--radius-sm);
}

.z77f4emeta-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    list-style: none;
    margin-top: 1.5rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
}

.z77f4etagitem a {
    display: inline-block;
    padding: 0.25rem 0.7rem;
    font-size: 0.78rem;
    background: var(--bg-alt);
    color: var(--brand-primary);
    border-radius: 50px;
    border: 1px solid var(--border);
}

.z77f4etagitem a:hover {
    background: var(--brand-primary);
    color: var(--text-inverse);
}

.z77f4earticle-nav {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 1.5rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
    font-size: 0.88rem;
}

.z77f4eprev-article,
.z77f4enext-article {
    flex: 1;
    min-width: 0;
}

.z77f4enext-article {
    text-align: right;
}

.z77f4earticle-nav a {
    color: var(--brand-primary);
}

.z77f4erelated-articles {
    margin-top: 1.5rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
}

.z77f4erelated-articles h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 1rem;
}

.z77f4erelated-list {
    list-style: none;
}

.z77f4erelated-item {
    display: flex;
    gap: 0.85rem;
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--border-light);
}

.z77f4erelated-item:last-child {
    border-bottom: none;
}

.z77f4erelated-thumb {
    flex: 0 0 100px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--border);
}

.z77f4erelated-thumb img {
    width: 100px;
    height: 68px;
    object-fit: cover;
}

.z77f4erelated-info {
    flex: 1;
    min-width: 0;
}

.z77f4erelated-title {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 0.35rem;
    line-height: 1.4;
}

.z77f4erelated-info p {
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 列表页 */
.z77f4elist-items {
    list-style: none;
}

.z77f4elist-item {
    display: flex;
    gap: 1rem;
    padding: 1.15rem 0;
    border-bottom: 1px solid var(--border);
}

.z77f4elist-item:first-child {
    padding-top: 0;
}

.z77f4elist-item:last-child {
    border-bottom: none;
}

.z77f4elist-thumb {
    flex: 0 0 200px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--border);
    aspect-ratio: 3/2;
    background: var(--bg-alt);
}

.z77f4elist-thumb a,
.z77f4elist-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.z77f4elist-body {
    flex: 1;
    min-width: 0;
}

.z77f4elist-title {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.45rem;
    line-height: 1.4;
}

.z77f4elist-title a {
    color: var(--text-main);
}

.z77f4elist-title a:hover {
    color: var(--brand-primary);
}

.z77f4elist-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem 0.85rem;
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-bottom: 0.45rem;
}

.z77f4elist-intro {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.65;
}

/* 分页 */
.z77f4epagebar {
    margin-top: 1.25rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
}

.z77f4epages {
    text-align: center;
}

.z77f4epages .pagelist {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 0.35rem;
    list-style: none;
    padding: 0;
    margin: 0;
}

.z77f4epages .pagelist li {
    display: inline-block;
}

.z77f4epages .pagelist a,
.z77f4epages .pagelist span {
    display: inline-block;
    padding: 0.4rem 0.75rem;
    font-size: 0.85rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-body);
    background: var(--bg-page);
    text-decoration: none;
    transition: var(--transition);
}

.z77f4epages .pagelist a:hover {
    background: var(--brand-primary);
    color: var(--text-inverse);
    border-color: var(--brand-primary);
}

.z77f4epages .pagelist .thisclass a {
    background: var(--brand-primary);
    color: var(--text-inverse);
    border-color: var(--brand-primary);
}

/* 侧栏 */
.z77f4esidebar {
    position: sticky;
    top: calc(var(--header-h) + 0.75rem);
}

.z77f4esidebar-block {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.z77f4esidebar-title {
    font-size: 0.92rem;
    font-weight: 700;
    color: var(--text-inverse);
    background: var(--brand-primary);
    padding: 0.75rem 1rem;
    margin: 0;
}

.z77f4esidebar-list {
    list-style: none;
    max-height: 520px;
    overflow-y: auto;
}

.z77f4esidebar-list li {
    border-bottom: 1px solid var(--border-light);
}

.z77f4esidebar-list li:last-child {
    border-bottom: none;
}

.z77f4esidebar-list a {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    padding: 0.6rem 0.85rem;
    color: var(--text-body);
    font-size: 0.84rem;
    transition: background var(--transition);
}

.z77f4esidebar-list a:hover {
    background: var(--bg-alt);
    color: var(--brand-primary);
}

.z77f4esidebar-thumb {
    flex: 0 0 56px;
    height: 42px;
    border-radius: 4px;
    overflow: hidden;
    border: 1px solid var(--border);
    background: var(--bg-alt);
}

.z77f4esidebar-thumb img {
    width: 56px;
    height: 42px;
    object-fit: cover;
}

.z77f4esidebar-text {
    flex: 1;
    min-width: 0;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.clear {
    clear: both;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .z77f4ehero-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .z77f4ehome-article-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .z77f4eknowledge-grid {
        grid-template-columns: 1fr;
    }

    .z77f4eprocess-row {
        grid-template-columns: repeat(2, 1fr);
    }

    .z77f4emain-layout {
        grid-template-columns: 1fr;
    }

    .z77f4esidebar {
        position: static;
    }

    .z77f4efooter-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --header-h: 60px;
    }

    .z77f4elogo-text {
        max-width: 140px;
        font-size: 0.95rem;
    }

    .z77f4emobile-menu-btn {
        display: flex;
    }

    .z77f4enav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-card);
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-md);
        padding: 0.75rem 1rem 1rem;
        max-height: calc(100vh - var(--header-h));
        overflow-y: auto;
    }

    .z77f4enav.active {
        display: block;
    }

    .z77f4eheader {
        position: fixed;
    }

    .z77f4eheader-inner {
        position: relative;
    }

    .z77f4enav ul {
        flex-direction: column;
        align-items: stretch;
        gap: 0.15rem;
    }

    .z77f4enav a {
        padding: 0.65rem 0.85rem;
        white-space: normal;
    }

    .z77f4ehero {
        padding-top: 2rem;
    }

    .z77f4estats-bar {
        grid-template-columns: repeat(2, 1fr);
        margin-bottom: -1rem;
    }

    .z77f4esection {
        padding: 2.5rem 0;
    }

    .z77f4eservice-grid {
        grid-template-columns: 1fr;
    }

    .z77f4eprocess-row {
        grid-template-columns: 1fr;
    }

    .z77f4ehome-article-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .z77f4econtact-wrap {
        grid-template-columns: 1fr;
    }

    .z77f4eform-row {
        grid-template-columns: 1fr;
    }

    .z77f4efooter-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .z77f4elist-item {
        flex-direction: column;
    }

    .z77f4elist-thumb {
        flex: unset;
        width: 100%;
    }

    .z77f4erelated-item {
        flex-direction: column;
    }

    .z77f4erelated-thumb {
        flex: unset;
        width: 100%;
    }

    .z77f4erelated-thumb img {
        width: 100%;
        height: auto;
        max-height: 160px;
    }

    .z77f4earticle-nav {
        flex-direction: column;
    }

    .z77f4enext-article {
        text-align: left;
    }

    .z77f4emain-content {
        padding: 1.15rem;
    }

    .z77f4epage-banner {
        padding: 1.5rem 0;
    }
}

@media (max-width: 480px) {
    .z77f4econtainer {
        padding: 0 1rem;
    }

    .z77f4ehome-article-grid {
        grid-template-columns: 1fr;
    }

    .z77f4ehero-actions {
        flex-direction: column;
    }

    .z77f4ehero-actions .z77f4ebtn {
        width: 100%;
    }

    .z77f4estats-bar {
        grid-template-columns: 1fr 1fr;
    }

    .z77f4estat {
        padding: 1rem 0.75rem;
    }

    .z77f4estat strong {
        font-size: 1.25rem;
    }

    .z77f4esidebar-list {
        max-height: none;
    }
}