/* ===== 设计令牌：墨绿 + 琥珀金（官网风格） ===== */
:root {
    --c-primary: #0f3d4c;
    --c-primary-light: #1a5568;
    --c-accent: #c9a227;
    --c-accent-hover: #b08e1f;
    --c-highlight: #c45c4a;
    --c-bg: #f4f1eb;
    --c-surface: #ffffff;
    --c-text: #1e333b;
    --c-muted: #5c6f78;
    --c-border: #dde4e8;
    --c-footer: #0a2a35;
    --radius: 10px;
    --radius-sm: 6px;
    --shadow: 0 4px 20px rgba(15, 61, 76, 0.08);
    --shadow-lg: 0 12px 40px rgba(15, 61, 76, 0.12);
    --container: 1140px;
    --gap: 24px;
    --header-h: 68px;
    --ease: 0.25s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 15px;
    line-height: 1.65;
    color: var(--c-text);
    background: var(--c-bg);
    overflow-x: hidden;
}

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

a {
    color: var(--c-primary-light);
    text-decoration: none;
    transition: color var(--ease);
}

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

.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== 顶栏 ===== */
.top-bar {
    background: var(--c-footer);
    color: rgba(255, 255, 255, 0.85);
    font-size: 13px;
    padding: 8px 0;
}

.contact-info {
    display: flex;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 12px;
}

/* ===== 头部导航 ===== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--c-surface);
    border-bottom: 1px solid var(--c-border);
    box-shadow: var(--shadow);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: var(--header-h);
    gap: 16px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
    color: var(--c-primary);
    max-width: 220px;
}

.brand:hover {
    color: var(--c-primary);
}

.brand-mark {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--c-primary), var(--c-primary-light));
    flex-shrink: 0;
}

.brand-name {
    font-size: 17px;
    font-weight: 700;
    line-height: 1.3;
    word-break: break-word;
}

.site-nav {
    flex: 1;
    min-width: 0;
}

.nav-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 4px 2px;
    list-style: none;
}

.nav-list a {
    display: block;
    padding: 8px 10px;
    font-size: 13px;
    color: var(--c-text);
    border-radius: var(--radius-sm);
    white-space: nowrap;
}

.nav-list a:hover,
.nav-list .is-active a,
.nav-list li.is-active a {
    color: var(--c-accent);
    background: rgba(201, 162, 39, 0.1);
}

.nav-toggle {
    position: fixed;
    opacity: 0;
    width: 0;
    height: 0;
    pointer-events: none;
}

.nav-toggle-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    padding: 10px;
    cursor: pointer;
    border: 1px solid var(--c-border);
    border-radius: var(--radius-sm);
    background: var(--c-surface);
    flex-shrink: 0;
}

.nav-toggle-btn span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--c-primary);
    transition: transform var(--ease), opacity var(--ease);
}

.nav-toggle:checked ~ .site-header .nav-toggle-btn span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle:checked ~ .site-header .nav-toggle-btn span:nth-child(2) {
    opacity: 0;
}

.nav-toggle:checked ~ .site-header .nav-toggle-btn span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.mobile-drawer {
    position: fixed;
    top: 0;
    left: -100%;
    width: min(300px, 85vw);
    height: 100vh;
    background: var(--c-surface);
    z-index: 1001;
    padding: 72px 20px 24px;
    overflow-y: auto;
    transition: left var(--ease);
    box-shadow: var(--shadow-lg);
    visibility: hidden;
}

.nav-toggle:checked ~ .mobile-drawer {
    left: 0;
    visibility: visible;
}

.mobile-nav-list {
    list-style: none;
}

.mobile-nav-link {
    display: block;
    padding: 14px 0;
    font-size: 15px;
    color: var(--c-text);
    border-bottom: 1px solid var(--c-border);
}

.mobile-nav-link:hover,
.mobile-nav-link.is-active {
    color: var(--c-accent);
}

.nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(10, 42, 53, 0.5);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    cursor: pointer;
    transition: opacity var(--ease), visibility var(--ease);
}

.nav-toggle:checked ~ .nav-overlay {
    opacity: 1;
    visibility: visible;
}

body:has(#nav-toggle:checked) {
    overflow: hidden;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-block;
    padding: 11px 22px;
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: 2px solid transparent;
    cursor: pointer;
    transition: background var(--ease), color var(--ease), border-color var(--ease);
    text-align: center;
}

.btn-primary {
    background: var(--c-accent);
    color: #fff;
    border-color: var(--c-accent);
}

.btn-primary:hover {
    background: var(--c-accent-hover);
    border-color: var(--c-accent-hover);
    color: #fff;
}

.btn-outline {
    background: transparent;
    color: var(--c-surface);
    border-color: rgba(255, 255, 255, 0.6);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
}

.btn-block {
    width: 100%;
}

/* ===== 首页 Hero ===== */
.hero {
    background: linear-gradient(145deg, var(--c-primary) 0%, #164a5c 55%, #1a5568 100%);
    color: #fff;
    padding: 56px 0 64px;
}

.hero-layout {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 40px;
    align-items: center;
}

.hero-eyebrow {
    font-size: 12px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    opacity: 0.75;
    margin-bottom: 12px;
}

.hero-copy h1 {
    font-size: clamp(26px, 4vw, 38px);
    font-weight: 800;
    line-height: 1.25;
    margin-bottom: 16px;
}

.hero-copy h1 strong {
    color: var(--c-accent);
    font-weight: 800;
}

.hero-lead {
    font-size: 16px;
    opacity: 0.92;
    margin-bottom: 24px;
    max-width: 540px;
}

.hero-lead strong {
    color: #f0d78c;
    font-weight: 600;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 28px;
}

.hero-metrics {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    list-style: none;
}

.hero-metrics li {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-sm);
    padding: 12px 18px;
    min-width: 88px;
    text-align: center;
}

.hero-metrics strong {
    display: block;
    font-size: 22px;
    color: var(--c-accent);
}

.hero-metrics span {
    font-size: 12px;
    opacity: 0.85;
}

.hero-visual {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.15);
    box-shadow: var(--shadow-lg);
}

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

.hero-badge {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 14px 16px;
    font-size: 13px;
    background: linear-gradient(transparent, rgba(10, 42, 53, 0.85));
}

/* ===== 通用区块 ===== */
.section {
    padding: 64px 0;
}

.section-alt {
    background: var(--c-surface);
}

.section-head {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 40px;
}

.section-tag {
    display: inline-block;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--c-accent);
    margin-bottom: 8px;
}

.section-head h2 {
    font-size: clamp(24px, 3vw, 32px);
    color: var(--c-primary);
    margin-bottom: 12px;
}

.section-head p {
    color: var(--c-muted);
    font-size: 15px;
}

.section-foot {
    text-align: center;
    margin-top: 36px;
}

/* ===== 介绍 ===== */
.intro-panel {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: var(--gap);
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
}

.intro-text p {
    color: var(--c-muted);
    margin-bottom: 14px;
}

.intro-text p:last-child {
    margin-bottom: 0;
}

.intro-points {
    list-style: none;
    border-left: 3px solid var(--c-accent);
    padding-left: 18px;
}

.intro-points li {
    padding: 8px 0;
    font-size: 14px;
    color: var(--c-text);
}

/* ===== 卡片网格 ===== */
.card-grid {
    display: grid;
    gap: var(--gap);
}

.card-grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

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

.service-card,
.consult-card {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    padding: 24px 20px;
    box-shadow: var(--shadow);
    transition: border-color var(--ease), transform var(--ease);
    min-width: 0;
}

.service-card:hover,
.consult-card:hover {
    border-color: var(--c-accent);
    transform: translateY(-3px);
}

.card-icon {
    width: 40px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    font-size: 14px;
    font-weight: 800;
    color: #fff;
    background: var(--c-primary);
    border-radius: var(--radius-sm);
    margin-bottom: 14px;
}

.service-card h3,
.consult-card h3 {
    font-size: 16px;
    color: var(--c-primary);
    margin-bottom: 10px;
    line-height: 1.4;
}

.service-card p,
.consult-card p {
    font-size: 14px;
    color: var(--c-muted);
    line-height: 1.65;
}

.consult-note {
    margin-top: 24px;
    padding: 16px 20px;
    font-size: 14px;
    color: var(--c-muted);
    background: var(--c-bg);
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--c-accent);
}

/* ===== 流程 ===== */
.process-track {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--gap);
    list-style: none;
    counter-reset: none;
}

.process-step {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    padding: 22px 18px;
    min-width: 0;
}

.step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    font-size: 14px;
    font-weight: 700;
    color: #fff;
    background: var(--c-highlight);
    border-radius: 50%;
    margin-bottom: 12px;
}

.process-step h3 {
    font-size: 16px;
    color: var(--c-primary);
    margin-bottom: 8px;
}

.process-step p {
    font-size: 13px;
    color: var(--c-muted);
}

/* ===== 知识区 ===== */
.knowledge-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: var(--gap);
    align-items: start;
}

.knowledge-main {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
    min-width: 0;
}

.knowledge-main h3 {
    font-size: 17px;
    color: var(--c-primary);
    margin: 20px 0 10px;
}

.knowledge-main h3:first-child {
    margin-top: 0;
}

.knowledge-main p {
    font-size: 14px;
    color: var(--c-muted);
    line-height: 1.75;
}

.knowledge-aside {
    background: var(--c-primary);
    color: rgba(255, 255, 255, 0.9);
    border-radius: var(--radius);
    padding: 22px 18px;
    min-width: 0;
}

.knowledge-aside h4 {
    font-size: 15px;
    margin-bottom: 14px;
    color: var(--c-accent);
}

.knowledge-aside ul {
    list-style: none;
}

.knowledge-aside li {
    font-size: 13px;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    line-height: 1.5;
}

.knowledge-aside li:last-child {
    border-bottom: none;
}

/* ===== FAQ ===== */
.faq-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.faq-item {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    padding: 0;
    overflow: hidden;
}

.faq-item summary {
    padding: 18px 20px;
    font-size: 15px;
    font-weight: 600;
    color: var(--c-primary);
    cursor: pointer;
    list-style: none;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item p {
    padding: 0 20px 18px;
    font-size: 14px;
    color: var(--c-muted);
    line-height: 1.7;
}

/* ===== 首页文章 ===== */
.home-articles-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 18px;
}

.home-article-card {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    overflow: hidden;
    min-width: 0;
    transition: box-shadow var(--ease);
}

.home-article-card:hover {
    box-shadow: var(--shadow);
}

.home-article-thumb {
    display: block;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background: var(--c-bg);
}

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

.home-article-info {
    padding: 12px 14px;
}

.home-article-title {
    font-size: 13px;
    line-height: 1.45;
    margin-bottom: 6px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.home-article-title a {
    color: var(--c-text);
}

.home-article-date {
    font-size: 12px;
    color: var(--c-muted);
}

.home-articles .home-article-desc,
.home-articles .home-article-intro,
.home-articles .home-article-body,
.home-articles .home-article-card > p,
.home-articles .home-article-info p {
    display: none !important;
}

/* ===== 联系 ===== */
.contact-section {
    background: linear-gradient(160deg, var(--c-primary) 0%, #164a5c 100%);
    color: #fff;
}

.contact-layout {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 40px;
    align-items: start;
}

.contact-copy .section-tag {
    color: var(--c-accent);
}

.contact-copy h2 {
    font-size: 28px;
    margin: 8px 0 16px;
}

.contact-copy p {
    opacity: 0.9;
    margin-bottom: 20px;
    font-size: 15px;
}

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

.contact-list li {
    padding: 10px 0;
    font-size: 14px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.contact-list strong {
    display: inline-block;
    min-width: 72px;
    color: var(--c-accent);
}

.contact-card {
    background: var(--c-surface);
    color: var(--c-text);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--c-border);
    box-shadow: var(--shadow-lg);
}

.contact-card h3 {
    font-size: 18px;
    color: var(--c-primary);
    margin-bottom: 8px;
}

.contact-hint {
    font-size: 13px;
    color: var(--c-muted);
    margin-bottom: 16px;
}

.contact-form label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--c-primary);
    margin-bottom: 14px;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    margin-top: 6px;
    padding: 10px 12px;
    border: 1px solid var(--c-border);
    border-radius: var(--radius-sm);
    font: inherit;
    color: var(--c-text);
    background: var(--c-bg);
}

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

.contact-form textarea {
    resize: vertical;
    min-height: 88px;
}

/* ===== 页脚 ===== */
.site-footer {
    background: var(--c-footer);
    color: rgba(255, 255, 255, 0.75);
    padding: 48px 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr 1fr;
    gap: 32px;
    padding-bottom: 32px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand h3 {
    color: #fff;
    font-size: 18px;
    margin-bottom: 12px;
}

.footer-brand p,
.footer-keywords p {
    font-size: 13px;
    line-height: 1.7;
}

.footer-nav h4,
.footer-keywords h4 {
    color: #fff;
    font-size: 14px;
    margin-bottom: 14px;
}

.footer-nav ul {
    list-style: none;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px 12px;
}

.footer-nav a {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.65);
}

.footer-nav a:hover {
    color: var(--c-accent);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
}

.footer-bottom p {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.45);
    margin-bottom: 4px;
}

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

/* ===== 内页 ===== */
.page-banner {
    background: var(--c-primary);
    color: #fff;
    padding: 36px 0 32px;
    border-bottom: 4px solid var(--c-accent);
}

.page-banner-title {
    font-size: clamp(20px, 3vw, 28px);
    margin-top: 10px;
    line-height: 1.35;
    word-break: break-word;
}

.breadcrumb {
    font-size: 13px;
    opacity: 0.9;
}

.breadcrumb a {
    color: #c5e4ef;
}

.breadcrumb a:hover {
    color: #fff;
}

.breadcrumb-sep {
    margin: 0 8px;
    opacity: 0.5;
}

.page-main {
    padding: 36px 0 56px;
}

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

.page-content {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
    min-width: 0;
    overflow: hidden;
}

/* 列表 */
.article-list {
    list-style: none;
}

.article-list-item {
    display: flex;
    gap: 18px;
    padding: 22px 0;
    border-bottom: 1px solid var(--c-border);
}

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

.article-list-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.article-list-thumb {
    flex: 0 0 180px;
    max-width: 180px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--c-border);
    display: block;
}

.article-list-thumb img {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
}

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

.article-list-title {
    font-size: 17px;
    margin-bottom: 8px;
    line-height: 1.4;
}

.article-list-title a {
    color: var(--c-primary);
}

.article-list-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    font-size: 12px;
    color: var(--c-muted);
    margin-bottom: 8px;
}

.article-list-intro {
    font-size: 14px;
    color: var(--c-muted);
    line-height: 1.65;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 8px;
}

.read-more {
    font-size: 13px;
    font-weight: 600;
    color: var(--c-highlight);
}

/* 分页 */
.pagebar {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--c-border);
}

.pagelist {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 8px;
    list-style: none;
}

.pagelist-lr {
    width: 100%;
}

.pagelist-lr .pre,
.pagelist-lr .prepage {
    margin-right: auto;
}

.pagelist-lr .next,
.pagelist-lr .nextpage {
    margin-left: auto;
}

.pagelist-lr .end,
.pagelist-lr .endpage {
    margin-left: 4px;
}

.pagelist .end,
.pagelist .endpage {
    display: inline-block !important;
}

.pagelist a,
.pagelist span {
    display: inline-block;
    padding: 7px 12px;
    font-size: 13px;
    border: 1px solid var(--c-border);
    border-radius: var(--radius-sm);
    color: var(--c-text);
    background: var(--c-surface);
}

.pagelist a:hover,
.pagelist .thisclass a {
    background: var(--c-primary);
    border-color: var(--c-primary);
    color: #fff !important;
}

.pagelist .pageinfo {
    border: none;
    background: none;
    color: var(--c-muted);
}

/* 内容页 */
.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 13px;
    color: var(--c-muted);
    padding-bottom: 16px;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--c-border);
}

.article-litpic {
    margin-bottom: 20px;
    text-align: center;
}

.article-litpic img {
    max-width: 100%;
    border-radius: var(--radius-sm);
    border: 1px solid var(--c-border);
}

.article-litpic:empty,
.article-litpic img[src=""] {
    display: none;
}

.article-body {
    font-size: 16px;
    line-height: 1.8;
    word-break: break-word;
}

.article-body img {
    max-width: 100% !important;
    height: auto !important;
    margin: 12px auto;
    border-radius: var(--radius-sm);
}

.article-gallery-item {
    margin: 14px 0;
    text-align: center;
}

.article-gallery-item figcaption {
    font-size: 12px;
    color: var(--c-muted);
    margin-top: 6px;
}

.zdb03ameta-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--c-border);
    list-style: none;
}

.zdb03atagitem a {
    padding: 4px 12px;
    font-size: 12px;
    background: rgba(15, 61, 76, 0.08);
    color: var(--c-primary);
    border-radius: 20px;
}

.article-prenext {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--c-border);
    font-size: 14px;
}

.prenext-item {
    flex: 1;
    min-width: 0;
    word-break: break-word;
    color: var(--c-muted);
}

.prenext-item a {
    color: var(--c-primary-light);
}

.prenext-prev a ~ a {
    display: none !important;
}

.prenext-next a:not(:last-of-type) {
    display: none !important;
}

.prenext-next {
    text-align: right;
}

.related-block {
    margin-top: 28px;
    padding-top: 24px;
    border-top: 1px solid var(--c-border);
}

.related-heading {
    font-size: 18px;
    color: var(--c-primary);
    margin-bottom: 16px;
}

.related-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.related-item {
    display: flex;
    gap: 14px;
    padding: 12px 0;
    border-bottom: 1px solid var(--c-border);
}

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

.related-thumb {
    flex: 0 0 96px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--c-border);
}

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

.related-body h4 {
    font-size: 14px;
    margin-bottom: 4px;
}

.related-body p {
    font-size: 13px;
    color: var(--c-muted);
}

.clear {
    clear: both;
}

/* 侧栏 */
.page-sidebar {
    position: sticky;
    top: calc(var(--header-h) + 16px);
}

.sidebar-widget {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius);
    padding: 18px;
    box-shadow: var(--shadow);
}

.sidebar-title {
    font-size: 16px;
    color: var(--c-primary);
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--c-accent);
}

.sidebar-article-list {
    list-style: none;
    max-height: 640px;
    overflow-y: auto;
}

.sidebar-article-item {
    border-bottom: 1px solid var(--c-border);
}

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

.sidebar-article-link {
    display: flex;
    gap: 10px;
    padding: 10px 0;
    align-items: flex-start;
}

.sidebar-thumb {
    flex: 0 0 52px;
    width: 52px;
    height: 40px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: var(--c-bg);
}

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

.sidebar-article-title {
    flex: 1;
    font-size: 13px;
    line-height: 1.45;
    color: var(--c-text);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-width: 0;
}

/* ===== 响应式 ===== */
@media (max-width: 1100px) {
    .card-grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .home-articles-grid {
        grid-template-columns: repeat(4, 1fr);
    }

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

    .footer-keywords {
        grid-column: 1 / -1;
    }
}

@media (max-width: 992px) {
    .site-nav {
        display: none;
    }

    .nav-toggle-btn {
        display: flex;
    }

    .hero-layout {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-lead {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-metrics {
        justify-content: center;
    }

    .intro-panel {
        grid-template-columns: 1fr;
    }

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

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

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

    .page-sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 48px 0;
    }

    .card-grid-3,
    .card-grid-4,
    .faq-grid,
    .process-track {
        grid-template-columns: 1fr;
    }

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

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

    .footer-nav ul {
        grid-template-columns: 1fr;
    }

    .article-list-item {
        flex-direction: column;
    }

    .article-list-thumb {
        flex: none;
        max-width: 100%;
        width: 100%;
    }

    .article-prenext {
        flex-direction: column;
    }

    .prenext-next {
        text-align: left;
    }

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

    .related-thumb {
        flex: none;
        width: 100%;
    }

    .pagelist-lr .pre,
    .pagelist-lr .prepage,
    .pagelist-lr .next,
    .pagelist-lr .nextpage {
        margin-left: 0;
        margin-right: 0;
    }

    .page-content {
        padding: 20px 16px;
    }

    .brand-name {
        font-size: 15px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 14px;
    }

    .home-articles-grid {
        grid-template-columns: 1fr;
    }

    .hero-metrics li {
        flex: 1;
        min-width: calc(50% - 8px);
    }

    .hero-actions .btn {
        width: 100%;
    }
}

@media print {
    .site-header,
    .mobile-drawer,
    .nav-overlay,
    .nav-toggle,
    .top-bar,
    .site-footer,
    .page-sidebar {
        display: none !important;
    }
}