/* ── 基础变量 (IT 信任色) ── */
:root {
    --ink: #111111;
    --ink2: #444444;
    --ink3: #777777;
    --paper: #F9F7F1;
    --paper2: #F4F4F0;
    --paper3: #EFEFEA;
    --line: rgba(17, 17, 17, 0.12);

    --accent: #1A4A8A;
    --accent2: #123666;
    --gold: #B8913A;

    --serif: 'Noto Serif SC', serif;
    --sans: 'Instrument Sans', sans-serif;
    --mono: 'DM Mono', monospace;
}

/* ── 全局重置 ── */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--sans);
    background: var(--paper);
    color: var(--ink);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ── 导航栏 ── */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 48px;
    height: 64px;
    background: rgba(249, 247, 241, 0.94);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line);
}

.logo {
    font-family: 'Playfair Display', serif;
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: #111111;
    text-decoration: none;
    display: flex;
    align-items: center;
}

.logo span {
    color: #1A4A8A;
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    font-size: 13px;
    font-weight: 500;
    color: var(--ink2);
    text-decoration: none;
    letter-spacing: 0.02em;
    transition: color 0.2s;
}

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

.nav-cta {
    font-family: var(--sans);
    font-size: 13px;
    font-weight: 600;
    padding: 8px 20px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.2s;
}

.nav-cta:hover {
    background: var(--accent2);
}

/* ── 区块基础样式 (首页及通用) ── */
section {
    padding: 100px 48px;
}

.section-inner {
    max-width: 1200px;
    margin: 0 auto;
}

.section-label {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-label::before {
    content: '';
    display: inline-block;
    width: 20px;
    height: 1px;
    background: var(--gold);
}

h2 {
    font-family: var(--serif);
    font-size: clamp(28px, 3vw, 40px);
    font-weight: 600;
    line-height: 1.25;
    margin-bottom: 16px;
}

.section-sub {
    font-size: 16px;
    color: var(--ink2);
    line-height: 1.7;
    max-width: 560px;
    margin-bottom: 60px;
}

.divider {
    height: 1px;
    background: var(--line);
}

/* ── 首屏焦点图 (首页) ── */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 48px 80px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 52%;
    height: 100%;
    background: var(--paper2);
    clip-path: polygon(8% 0, 100% 0, 100% 100%, 0% 100%);
    z-index: 0;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    position: relative;
    z-index: 1;
}

.hero-label {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.hero-label::before {
    content: '';
    display: inline-block;
    width: 28px;
    height: 1px;
    background: var(--gold);
}

h1 {
    font-family: var(--serif);
    font-size: clamp(36px, 4.5vw, 58px);
    font-weight: 600;
    line-height: 1.22;
    letter-spacing: -0.01em;
    color: var(--ink);
    margin-bottom: 28px;
}

h1 em {
    font-style: normal;
    color: var(--accent);
}

.hero-desc {
    font-size: 16px;
    color: var(--ink2);
    line-height: 1.75;
    max-width: 460px;
    margin-bottom: 40px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn-primary {
    font-family: var(--sans);
    font-size: 14px;
    font-weight: 600;
    padding: 14px 28px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.2s, transform 0.15s;
}

.btn-primary:hover {
    background: var(--accent2);
    transform: translateY(-1px);
}

.btn-outline {
    font-family: var(--sans);
    font-size: 14px;
    font-weight: 500;
    padding: 13px 28px;
    background: transparent;
    color: var(--ink);
    border: 1.5px solid var(--ink);
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    transition: border-color 0.2s, color 0.2s;
}

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

.hero-right {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 16px;
}

.stat-card {
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 22px 24px;
    display: flex;
    align-items: center;
    gap: 20px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.stat-card:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 20px rgba(26, 74, 138, 0.08);
}

.stat-icon {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--paper2);
    border-radius: 8px;
}

.stat-icon svg {
    width: 22px;
    height: 22px;
    stroke: var(--accent);
    fill: none;
    stroke-width: 1.5;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.stat-desc {
    font-size: 13px;
    color: var(--ink2);
    line-height: 1.55;
}

.stat-desc strong {
    color: var(--ink);
    font-weight: 600;
    display: block;
    margin-bottom: 3px;
    font-size: 14px;
}

/* ── 服务体系 (首页) ── */
.services-bg {
    background: var(--paper2);
    /* 从 paper 改为 paper2，解决与首屏左侧的撞色 */
}

.service-phases {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2px;
}

.phase {
    background: var(--paper);
    padding: 44px 40px;
    position: relative;
    overflow: hidden;
    transition: background 0.25s;
}

.phase:hover {
    background: #fff;
}

.phase::after {
    content: attr(data-num);
    position: absolute;
    bottom: -10px;
    right: 16px;
    font-family: var(--serif);
    font-size: 96px;
    font-weight: 600;
    color: var(--line);
    line-height: 1;
    pointer-events: none;
    transition: color 0.25s;
}

.phase:hover::after {
    color: rgba(26, 74, 138, 0.07);
}

.phase-num {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.12em;
    color: var(--accent);
    margin-bottom: 16px;
}

.phase h3 {
    font-family: var(--serif);
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 8px;
}

.phase-tagline {
    font-size: 12px;
    color: var(--gold);
    font-family: var(--mono);
    letter-spacing: 0.05em;
    margin-bottom: 20px;
}

.phase p {
    font-size: 14px;
    color: var(--ink2);
    line-height: 1.75;
    margin-bottom: 20px;
}

.phase-items {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.phase-items li {
    font-size: 13px;
    color: var(--ink2);
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 8px 12px;
    background: var(--paper2);
    border-radius: 4px;
}

.phase-items li::before {
    content: '→';
    color: var(--accent);
    font-family: var(--mono);
    font-size: 12px;
    flex-shrink: 0;
    margin-top: 1px;
}

/* ── 产品方案 (首页) ── */
.products-bg {
    background: var(--paper);
    /* 从 paper2 改为 paper */
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.product-group {
    border: 1px solid var(--line);
    border-radius: 8px;
    overflow: hidden;
}

.product-group-header {
    padding: 20px 24px;
    background: var(--paper2);
    border-bottom: 1px solid var(--line);
}

.product-group-header .group-tag {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--ink3);
    margin-bottom: 6px;
}

.product-group-header h4 {
    font-family: var(--serif);
    font-size: 17px;
    font-weight: 600;
}

.product-list {
    padding: 16px 0;
}

.product-item {
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--line);
    transition: background 0.15s;
}

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

.product-item:hover {
    background: var(--paper2);
}

.product-name {
    font-size: 14px;
    font-weight: 500;
}

.product-badge {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.06em;
    padding: 3px 8px;
    border-radius: 3px;
}

.badge-domestic {
    background: #E8F0FE;
    color: #1A4A8A;
}

.badge-global {
    background: var(--paper3);
    color: var(--ink);
}

.badge-cloud {
    background: var(--line);
    color: var(--ink2);
}

/* ── 合作方式 (首页) ── */
.how-bg {
    background: var(--accent);
    /* 已替换为深海蓝，拒绝黑箱感 */
    color: var(--paper);
}

.how-bg h2 {
    color: var(--paper);
}

.how-bg .section-label {
    color: var(--gold);
}

.how-bg .section-label::before {
    background: var(--gold);
}

.how-bg .section-sub {
    color: rgba(249, 247, 241, 0.65);
}

.steps-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    overflow: hidden;
}

.step {
    padding: 36px 28px;
    border-right: 1px solid rgba(255, 255, 255, 0.1);
}

.step:last-child {
    border-right: none;
}

.step-n {
    font-family: var(--serif);
    font-size: 42px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.08);
    line-height: 1;
    margin-bottom: 16px;
}

.step h4 {
    font-family: var(--serif);
    font-size: 17px;
    font-weight: 600;
    color: var(--paper);
    margin-bottom: 12px;
}

.step p {
    font-size: 13px;
    color: rgba(249, 247, 241, 0.55);
    line-height: 1.65;
}

.step-tag {
    margin-top: 20px;
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.1em;
    color: var(--gold);
}

/* ── 核心优势 (首页) ── */
.why-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1px;
    background: var(--line);
}

.why-item {
    background: #fff;
    /* 从 var(--paper) 改为纯白，让这 6 个格子像悬浮的卡片一样弹出来 */
    padding: 40px 32px;
}

.why-icon {
    width: 40px;
    height: 40px;
    background: var(--paper2);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.why-icon svg {
    width: 20px;
    height: 20px;
    stroke: var(--accent);
    fill: none;
    stroke-width: 1.5;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.why-item h4 {
    font-family: var(--serif);
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
}

.why-item p {
    font-size: 14px;
    color: var(--ink2);
    line-height: 1.7;
}

/* ── 洞察案例与文章卡片 (首页及列表页公用) ── */
.insights-bg {
    background: var(--paper);
    /* 从 paper2 改为 paper，平滑过渡到底部深蓝 */
}

.insights-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.article-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.article-card {
    background: #fff;
    /* 从 paper 改为纯白，提升阅读卡片的洁净度 */
    border: 1px solid var(--line);
    border-radius: 8px;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.article-card:hover {
    border-color: var(--accent);
    box-shadow: 0 8px 28px rgba(26, 74, 138, 0.1);
    transform: translateY(-2px);
}

.article-card-body {
    padding: 28px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.article-tag {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 12px;
}

.article-card h3,
.article-card h4 {
    font-family: var(--serif);
    font-size: 17px;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 12px;
    color: var(--ink);
}

.article-card p {
    font-size: 13px;
    color: var(--ink2);
    line-height: 1.65;
    flex: 1;
}

.article-card-footer {
    padding: 16px 28px;
    border-top: 1px solid var(--line);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.article-date {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--ink3);
}

.article-arrow {
    font-size: 14px;
    color: var(--accent);
    transition: transform 0.2s;
}

.article-card:hover .article-arrow {
    transform: translateX(4px);
}

.insights-more {
    text-align: center;
}

/* ── 列表页专属 (页面头部与筛选器) ── */
.page-header {
    padding: 120px 48px 64px;
    background: var(--paper2);
    border-bottom: 1px solid var(--line);
}

.page-header-inner {
    max-width: 1200px;
    margin: 0 auto;
}

.breadcrumb {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.12em;
    color: var(--ink3);
    margin-bottom: 20px;
}

.breadcrumb a {
    color: var(--ink3);
    text-decoration: none;
}

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

.page-header h1 {
    font-family: var(--serif);
    font-size: clamp(28px, 3.5vw, 44px);
    font-weight: 600;
    margin-bottom: 16px;
}

.page-desc {
    font-size: 16px;
    color: var(--ink2);
    max-width: 540px;
    line-height: 1.7;
}

.filter-bar {
    padding: 24px 48px;
    border-bottom: 1px solid var(--line);
    background: var(--paper);
    /* position: sticky; */
    /* top: 64px; */
    /* z-index: 50; */
}

.filter-bar-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.filter-btn {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.08em;
    padding: 7px 16px;
    border-radius: 3px;
    cursor: pointer;
    border: 1px solid var(--line);
    background: transparent;
    color: var(--ink2);
    transition: all 0.15s;
}

.filter-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

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

.articles-section {
    padding: 60px 48px 100px;
}

.articles-inner {
    max-width: 1200px;
    margin: 0 auto;
}

.featured-article {
    display: grid;
    grid-template-columns: 1fr 1fr;
    border: 1px solid var(--line);
    border-radius: 8px;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    margin-bottom: 48px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.featured-article:hover {
    border-color: var(--accent);
    box-shadow: 0 8px 32px rgba(26, 74, 138, 0.08);
}

.featured-body {
    padding: 48px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.featured-tag {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 16px;
}

.featured-body h2 {
    font-family: var(--serif);
    font-size: clamp(20px, 2vw, 26px);
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 16px;
}

.featured-body p {
    font-size: 14px;
    color: var(--ink2);
    line-height: 1.75;
    flex: 1;
    margin-bottom: 32px;
}

.featured-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.featured-date {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--ink3);
}

.read-more {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.08em;
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 6px;
}

.featured-visual {
    background: var(--paper2);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 48px;
}

.featured-visual-inner {
    width: 100%;
    max-width: 240px;
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 24px;
}

.mock-tag {
    height: 8px;
    width: 60px;
    background: var(--gold);
    opacity: 0.5;
    border-radius: 2px;
    margin-bottom: 16px;
}

.mock-title {
    height: 10px;
    background: var(--ink);
    opacity: 0.15;
    border-radius: 2px;
    margin-bottom: 8px;
}

.mock-title.short {
    width: 70%;
}

.mock-body {
    height: 6px;
    background: var(--ink);
    opacity: 0.1;
    border-radius: 2px;
    margin-bottom: 6px;
}

/* ── 详情页专属 (文章详情) ── */
.article-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 48px 80px;
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 80px;
    align-items: start;
}

.article-main h1 {
    font-family: var(--serif);
    font-size: clamp(24px, 2.8vw, 36px);
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 24px;
}

.article-main .article-tag {
    display: flex;
    align-items: center;
    gap: 8px;
}

.article-main .article-tag::before {
    content: '';
    width: 20px;
    height: 1px;
    background: var(--gold);
    display: inline-block;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 24px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--line);
    margin-bottom: 48px;
}

.meta-item {
    font-family: var(--mono);
    font-size: 11px;
    color: var(--ink3);
    letter-spacing: 0.06em;
}

.meta-item strong {
    color: var(--ink2);
}

.article-body h2 {
    font-family: var(--serif);
    font-size: 22px;
    font-weight: 600;
    margin: 48px 0 16px;
    padding-top: 16px;
    border-top: 1px solid var(--line);
    scroll-margin-top: 80px;
}

.article-body h3 {
    font-family: var(--serif);
    font-size: 18px;
    font-weight: 600;
    margin: 32px 0 12px;
    color: var(--ink);
    scroll-margin-top: 80px;
}

.article-body p {
    font-size: 15px;
    color: var(--ink2);
    line-height: 1.85;
    margin-bottom: 20px;
}

.article-body ul,
.article-body ol {
    padding-left: 24px;
    margin-bottom: 20px;
}

.article-body li {
    font-size: 15px;
    color: var(--ink2);
    line-height: 1.8;
    margin-bottom: 8px;
}

.article-body strong {
    color: var(--ink);
    font-weight: 600;
}

.article-body code {
    font-family: var(--mono);
    font-size: 13px;
    background: var(--paper2);
    padding: 2px 7px;
    border-radius: 3px;
    color: var(--accent);
}

.callout {
    background: var(--paper2);
    border-left: 3px solid var(--gold);
    padding: 20px 24px;
    border-radius: 0 6px 6px 0;
    margin: 32px 0;
}

.callout p {
    margin: 0;
    font-size: 14px;
}

.callout .callout-label {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.1em;
    color: var(--gold);
    margin-bottom: 8px;
}

.step-block {
    background: var(--paper2);
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 20px 24px;
    margin: 16px 0;
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.step-num {
    font-family: var(--serif);
    font-size: 24px;
    font-weight: 600;
    color: var(--accent);
    opacity: 0.3;
    line-height: 1;
    min-width: 28px;
}

.step-content h4 {
    font-family: var(--serif);
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 6px;
}

.step-content p {
    font-size: 13px;
    color: var(--ink2);
    line-height: 1.65;
    margin: 0;
}

.article-sidebar {
    position: sticky;
    top: 88px;
}

.sidebar-block {
    background: var(--paper2);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 24px;
    margin-bottom: 20px;
}

.sidebar-label {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--ink3);
    margin-bottom: 16px;
}

.toc-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toc-list a {
    font-size: 13px;
    color: var(--ink2);
    text-decoration: none;
    display: flex;
    align-items: flex-start;
    gap: 8px;
    line-height: 1.45;
}

.toc-list a:hover {
    color: var(--accent);
}

.toc-list a::before {
    content: '·';
    color: var(--gold);
    flex-shrink: 0;
}

.cta-sidebar {
    background: var(--accent);
    border-radius: 8px;
    padding: 24px;
}

.cta-sidebar h4 {
    font-family: var(--serif);
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 10px;
}

.cta-sidebar p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
    margin-bottom: 16px;
}

.cta-sidebar a {
    display: block;
    text-align: center;
    font-size: 13px;
    font-weight: 600;
    padding: 10px;
    background: #fff;
    color: var(--accent);
    border-radius: 4px;
    text-decoration: none;
}

.related-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.related-list a {
    font-size: 13px;
    color: var(--ink2);
    text-decoration: none;
    line-height: 1.45;
    display: flex;
    gap: 8px;
}

.related-list a:hover {
    color: var(--accent);
}

.related-list a::before {
    content: '→';
    color: var(--accent);
    flex-shrink: 0;
    font-family: var(--mono);
    font-size: 11px;
    margin-top: 2px;
}

.article-footer {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 48px 80px;
}

.article-nav {
    display: flex;
    justify-content: space-between;
    gap: 20px;
}

.article-nav a {
    flex: 1;
    padding: 20px 24px;
    background: var(--paper2);
    border: 1px solid var(--line);
    border-radius: 6px;
    text-decoration: none;
    color: inherit;
    transition: border-color 0.2s;
}

.article-nav a:hover {
    border-color: var(--accent);
}

.nav-dir {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.1em;
    color: var(--ink3);
    margin-bottom: 6px;
}

.nav-title {
    font-family: var(--serif);
    font-size: 14px;
    font-weight: 600;
    color: var(--ink);
}

.article-nav .next {
    text-align: right;
}

/* ── 隐私政策页专属 (法律声明) ── */
.legal-header {
    padding: 160px 48px 60px;
    background: var(--paper2);
    border-bottom: 1px solid var(--line);
    text-align: center;
}

.legal-header h1 {
    font-family: var(--serif);
    font-size: clamp(32px, 4vw, 48px);
    margin-bottom: 16px;
    color: var(--ink);
}

.legal-meta {
    font-family: var(--mono);
    font-size: 12px;
    color: var(--ink3);
    letter-spacing: 0.1em;
}

.legal-body {
    max-width: 860px;
    margin: 0 auto;
    padding: 80px 48px 120px;
}

.legal-body h2 {
    font-family: var(--serif);
    font-size: 22px;
    font-weight: 600;
    margin: 48px 0 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--line);
    color: var(--ink);
}

.legal-body p {
    font-size: 15px;
    color: var(--ink2);
    line-height: 1.8;
    margin-bottom: 20px;
}

.legal-body ul {
    padding-left: 24px;
    margin-bottom: 20px;
}

.legal-body li {
    font-size: 15px;
    color: var(--ink2);
    line-height: 1.8;
    margin-bottom: 10px;
}

.legal-body strong {
    color: var(--ink);
    font-weight: 600;
}

/* ── 客户墙 ── */
.client-wall {
    padding: 100px 48px;
    background: var(--paper2);
    /* 从 #FFFFFF 彻底改为 paper2 */
    /* border-bottom: 1px solid var(--line); */
    /* border-top: 1px solid var(--line); */
}

.client-wall .section-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* 升级标题样式，与其他模块的 h2 保持一致 */
.client-wall h2 {
    font-family: var(--serif);
    font-size: clamp(28px, 3vw, 40px);
    font-weight: 600;
    margin-bottom: 60px;
    /* 增加与下方 Logo 的间距 */
    color: var(--ink);
    text-align: center;
}

/* 隐藏原本那个小字体的 label，如果你在 HTML 里没删掉的话 */
.client-label {
    display: none;
}

.client-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    /* 确保各种大小的 Logo 垂直居中对齐 */
    gap: 50px 80px;
    /* 拉开横向和纵向的间距，显得更大气 */
    width: 100%;
    max-width: 1000px;
    /* 限制最大宽度，让两排 Logo 更紧凑好看 */
}

.client-logo {
    font-family: var(--serif);
    font-size: 18px;
    /* 整体字体放大 */
    color: var(--ink);
    opacity: 0.45;
    /* 稍微调亮一点基础透明度 */
    transition: opacity 0.3s, transform 0.3s;
    cursor: default;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.client-logo img {
    height: 48px;
    /* 👈 把这里调大（推荐 48px 或 56px） */
    width: auto;
    display: block;
    filter: grayscale(100%);
    transition: filter 0.3s;
}

/* 鼠标悬浮时放大且变亮，图片恢复彩色 */
.client-logo:hover {
    opacity: 1;
    transform: scale(1.05);
}

.client-logo:hover img {
    filter: grayscale(0%);
}

/* ── 团队介绍 ── */
.team-bg {
    background: var(--paper2);
    /* 从 #FFFFFF 改为沉稳的 paper2 */
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.team-card {
    background: #fff;
    /* 从 paper2 改为纯白，让团队专家卡片脱颖而出 */
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 40px 32px;
    transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.team-card:hover {
    border-color: var(--accent);
    box-shadow: 0 8px 28px rgba(26, 74, 138, 0.08);
    transform: translateY(-2px);
}

.team-cert {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.1em;
    color: #fff;
    background: var(--ink);
    padding: 4px 10px;
    border-radius: 3px;
    display: inline-block;
    margin-bottom: 24px;
}

.team-name {
    font-family: var(--serif);
    font-size: 22px;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 6px;
}

.team-role {
    font-size: 13px;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 20px;
}

.team-desc {
    font-size: 14px;
    color: var(--ink2);
    line-height: 1.7;
}


/* ── 重构的行动呼吁区块 (极简高级版) ── */
.cta-section {
    background: var(--accent);
    padding: 100px 48px;
}

.cta-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    /* 右侧表单区域稍微宽一点，凸显主体 */
    gap: 100px;
    /* 大幅拉开左右间距，增加高级留白感 */
    align-items: center;
}

/* ── 左侧：信息与联系方式区 ── */
.cta-info h2 {
    color: #fff;
    margin-bottom: 16px;
    font-family: var(--serif);
    font-size: clamp(32px, 3.5vw, 44px);
}

.cta-desc {
    color: rgba(255, 255, 255, 0.75);
    font-size: 16px;
    line-height: 1.7;
    margin-bottom: 48px;
    /* 与下方的联系方式拉开显著距离 */
}

.contact-methods-list {
    display: flex;
    flex-direction: column;
    gap: 32px;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    /* 优雅的分割线 */
}

.cm-item {
    display: flex;
    align-items: center;
    gap: 20px;
}

.cm-icon {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50%;
    /* 改用圆形背景，打破满屏方块的死板 */
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.cm-icon svg {
    width: 24px;
    height: 24px;
    stroke: #fff;
    fill: none;
    stroke-width: 1.5;
}

.cm-qr {
    width: 60px;
    /* 缩小二维码尺寸，使其更加精致不抢戏 */
    height: 60px;
    border-radius: 4px;
    background: #fff;
    flex-shrink: 0;
    padding: 4px;
}

.cm-qr img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    border-radius: 4px;
}

.cm-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.cm-label {
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.1em;
    color: rgba(255, 255, 255, 0.5);
}

.cm-value {
    font-family: var(--serif);
    font-size: 16px;
    color: #fff;
    line-height: 1.4;
    font-weight: 600;
}

.cm-item:last-child .cm-value {
    font-family: var(--sans);
    font-size: 13px;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.7);
}

/* ── 右侧：一体化表单卡片区 ── */
.cta-form-wrapper {
    background: rgba(0, 0, 0, 0.15);
    /* 深色磨砂玻璃底座，收拢视觉焦点 */
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    /* 更大的圆角 */
    padding: 48px;
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.2);
    /* 悬浮阴影 */
}

.premium-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    /* Label和输入框的间距 */
}

.form-group label {
    font-size: 13px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.85);
}

.premium-form input,
.premium-form textarea {
    width: 100%;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid transparent;
    /* 默认无边框，极简干净 */
    color: #fff;
    padding: 14px 16px;
    border-radius: 8px;
    font-family: var(--sans);
    font-size: 14px;
    transition: all 0.3s ease;
    -webkit-appearance: none;
    appearance: none;
    box-shadow: none !important;
}

.premium-form textarea {
    resize: none;
    min-height: 100px;
}

.premium-form input::placeholder,
.premium-form textarea::placeholder {
    color: rgba(255, 255, 255, 0.25);
}

.premium-form input:focus,
.premium-form textarea:focus {
    outline: none;
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
    /* 聚焦时才显示边框 */
}

/* 按钮横跨满格，提升召唤力 */
.btn-submit-premium {
    background: #fff;
    color: var(--accent);
    border: none;
    padding: 16px 32px;
    font-size: 15px;
    font-weight: 600;
    font-family: var(--sans);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 8px;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.btn-submit-premium:hover {
    background: var(--paper2);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.btn-submit-premium:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.form-status {
    font-size: 13px;
    text-align: center;
    margin-top: -8px;
}

/* ── 响应式适配 (全站媒体查询整合) ── */
@media (max-width: 900px) {
    .cta-inner {
        grid-template-columns: 1fr;
        gap: 60px;
    }

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

    .cta-form-wrapper {
        padding: 32px 24px;
    }

    /* 🚨 仅针对移动端：单独让 Logo 居中，其余保持左对齐不变 */
    .footer-brand {
        width: 100%;
        max-width: 100%;
        display: flex;
        flex-direction: column;
    }

    .footer-logo {
        align-self: center;
        /* 仅让 IECLUB 居中 */
    }

    .footer-contact {
        align-self: flex-start;
        /* 锁定下方的地址栏，死死按在左边不动 */
    }
}

/* ── 页脚 (全新升级版) ── */
footer {
    background: var(--ink);
    color: rgba(249, 247, 241, 0.5);
    padding: 60px 48px 40px;
    border-top: 1px solid var(--line);
    font-size: 13px;
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 60px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 30px;
}

.footer-brand {
    max-width: 400px;
}

.footer-logo {
    font-family: 'Playfair Display', serif;
    font-size: 28px;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: #FFFFFF;
    margin-bottom: 16px;
    line-height: 1;
}

.footer-logo span {
    color: #1A4A8A;
}

.footer-slogan {
    font-family: var(--serif);
    font-size: 15px;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 24px;
}

.footer-contact {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-contact p {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    line-height: 1.5;
}

.footer-contact strong {
    font-family: var(--mono);
    color: var(--accent);
    font-weight: 600;
}

.footer-certs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    max-width: 500px;
}

.cert-item {
    border: 1px solid rgba(255, 255, 255, 0.15);
    padding: 12px 16px;
    border-radius: 6px;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.05em;
    color: rgba(255, 255, 255, 0.7);
    display: flex;
    align-items: center;
    gap: 10px;
    transition: border-color 0.2s, color 0.2s;
}

.cert-item:hover {
    border-color: rgba(255, 255, 255, 0.4);
    color: #fff;
}

.cert-item::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.4);
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.4);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-bottom a:hover {
    color: #fff;
}

.footer-copy {
    display: flex;
    align-items: center;
    gap: 16px;
}

.footer-legal {
    display: flex;
    align-items: center;
    gap: 20px;
    font-family: var(--mono);
}

/* ── 动画效果 ── */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-content>* {
    animation: fadeUp 0.6s ease both;
}

.hero-content>*:nth-child(1) {
    animation-delay: 0.1s;
}

.hero-content>*:nth-child(2) {
    animation-delay: 0.2s;
}

.hero-content>*:nth-child(3) {
    animation-delay: 0.3s;
}

.hero-content>*:nth-child(4) {
    animation-delay: 0.4s;
}

.stat-card:nth-child(1) {
    animation: fadeUp 0.6s ease 0.3s both;
}

.stat-card:nth-child(2) {
    animation: fadeUp 0.6s ease 0.45s both;
}

.stat-card:nth-child(3) {
    animation: fadeUp 0.6s ease 0.6s both;
}

/* ── 响应式适配 (全站媒体查询整合) ── */
@media (max-width: 900px) {

    nav,
    footer,
    .cta-section {
        padding-left: 24px;
        padding-right: 24px;
    }

    .nav-links {
        display: none;
    }

    .hero,
    section {
        padding: 80px 24px 60px;
    }

    .hero-grid,
    .service-phases,
    .cta-inner {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero::before {
        display: none;
    }

    .products-grid,
    .insights-grid,
    .article-grid {
        grid-template-columns: 1fr;
    }

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

    .step:nth-child(2) {
        border-right: none;
    }

    .step:nth-child(3),
    .step:nth-child(4) {
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }

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

    /* 文章列表页响应式 */
    .page-header,
    .articles-section {
        padding-left: 24px;
        padding-right: 24px;
    }

    .filter-bar {
        padding: 16px 24px;
    }

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

    .featured-visual {
        display: none;
    }

    /* 文章详情页响应式 */
    .article-wrapper {
        grid-template-columns: 1fr;
        gap: 40px;
        padding: 80px 24px 40px;
    }

    .article-sidebar {
        position: static;
    }

    .article-footer {
        padding: 0 24px 60px;
    }

    /* 法律声明页响应式 */
    .legal-header,
    .legal-body {
        padding-left: 24px;
        padding-right: 24px;
    }

    .legal-header {
        padding-top: 120px;
    }

    .legal-body {
        padding-top: 40px;
        padding-bottom: 60px;
    }

    .footer-inner {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }

    .footer-top {
        flex-direction: column;
        gap: 40px;
    }

    .footer-certs {
        grid-template-columns: 1fr;
        width: 100%;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }

    .footer-legal {
        flex-direction: column;
        gap: 8px;
    }

    .client-grid {
        gap: 30px;
    }

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

/* ── Cookie 与隐私政策横幅 ── */
.cookie-banner {
    position: fixed;
    bottom: -100px;
    /* 初始隐藏在屏幕下方，配合 JS 动画使用 */
    left: 24px;
    z-index: 9999;
    background: var(--ink);
    /* 使用你的全局黑色变量 */
    color: #fff;
    padding: 20px 24px;
    border-radius: 8px;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    gap: 24px;
    max-width: 480px;
    /* 限制最大宽度，呈现精致的 SaaS 浮窗感 */
    opacity: 0;
    visibility: hidden;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.cookie-banner.show {
    bottom: 24px;
    /* 动画滑入的位置 */
    opacity: 1;
    visibility: visible;
}

.cookie-text {
    font-size: 13px;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.8);
}

.cookie-text a {
    color: #fff;
    text-decoration: underline;
    text-decoration-color: rgba(255, 255, 255, 0.4);
    text-underline-offset: 3px;
    transition: color 0.2s, text-decoration-color 0.2s;
}

.cookie-text a:hover {
    color: var(--accent);
    /* 鼠标悬浮时变为全局强调蓝 */
    text-decoration-color: var(--accent);
}

.cookie-btn {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    font-family: var(--sans);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    /* 防止按钮文字折行 */
    transition: background 0.2s;
}

.cookie-btn:hover {
    background: var(--accent2);
}

/* 针对手机端的自适应：变成全宽吸底 */
@media (max-width: 600px) {
    .cookie-banner {
        left: 16px;
        right: 16px;
        bottom: -150px;
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
        max-width: none;
    }

    .cookie-banner.show {
        bottom: 16px;
    }

    .cookie-btn {
        width: 100%;
    }
}

/* ── 全宽 Cookie 与隐私政策横幅 ── */
.cookie-banner-fw {
    position: fixed;
    bottom: -150px;
    /* 初始隐藏在屏幕视口最下方之外 */
    left: 0;
    width: 100%;
    /* 横跨全屏 */
    z-index: 9999;
    background: var(--ink);
    /* 采用极黑底色，压住全场 */
    border-top: 3px solid var(--accent);
    /* 顶部点缀一条品牌蓝线，增加层次感 */
    padding: 24px 48px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 32px;
    /* 极致平滑的缓动曲线，让它升起时有阻尼感 */
    transition: bottom 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.15);
}

.cookie-banner-fw.show {
    bottom: 0;
    /* 贴紧屏幕最底部 */
}

.cookie-banner-fw .cookie-text {
    font-size: 13px;
    line-height: 1.6;
    color: rgba(255, 255, 255, 0.85);
    font-family: var(--sans);
    margin: 0;
}

.cookie-banner-fw .cookie-text a {
    color: #fff;
    text-decoration: underline;
    text-decoration-color: rgba(255, 255, 255, 0.4);
    text-underline-offset: 3px;
    font-weight: 600;
    transition: color 0.2s, text-decoration-color 0.2s;
}

.cookie-banner-fw .cookie-text a:hover {
    color: var(--accent);
    text-decoration-color: var(--accent);
}

.cookie-actions {
    display: flex;
    gap: 12px;
    flex-shrink: 0;
    /* 防止按钮被挤压变形 */
}

/* 接受按钮：实心强调色 */
.cookie-btn-accept {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 10px 28px;
    border-radius: 4px;
    font-family: var(--sans);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: background 0.2s;
}

.cookie-btn-accept:hover {
    background: var(--accent2);
}

/* 拒绝按钮：透明描边色 */
.cookie-btn-decline {
    background: transparent;
    color: rgba(255, 255, 255, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 10px 24px;
    border-radius: 4px;
    font-family: var(--sans);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: all 0.2s;
}

.cookie-btn-decline:hover {
    color: #fff;
    border-color: rgba(255, 255, 255, 0.5);
}

/* ── 404 错误页专属样式 ── */
.error-page-wrapper {
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 160px 48px 80px;
    background: var(--paper2);
    text-align: center;
    border-bottom: 1px solid var(--line);
}

.error-content {
    max-width: 600px;
}

.error-code {
    font-family: var(--serif);
    font-size: clamp(80px, 10vw, 140px);
    font-weight: 700;
    color: var(--accent);
    opacity: 0.15;
    line-height: 1;
    margin-bottom: -20px;
    /* 让数字和标题稍微重叠，增加设计感 */
}

.error-title {
    font-family: var(--serif);
    font-size: clamp(24px, 3vw, 32px);
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.error-desc {
    font-size: 15px;
    color: var(--ink2);
    line-height: 1.8;
    margin-bottom: 40px;
}

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

/* 移动端适配：竖向排列 */
@media (max-width: 900px) {
    .cookie-banner-fw {
        flex-direction: column;
        align-items: flex-start;
        /* 保持文字左对齐，方便阅读 */
        padding: 24px;
        gap: 20px;
    }

    .cookie-actions {
        width: 100%;
        justify-content: center;
        /* 将 flex-end 修改为 center，让按钮居中 */
    }
}