/* ===================================
   SEO科技 - 改版主样式表 v2.0
   四大业务 · 新导航 · 响应式
   =================================== */

/* ---------- CSS 变量 ---------- */
:root {
    --primary:      #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light:#3b82f6;
    --accent:       #f59e0b;
    --geo:          #7c3aed;
    --geo-light:    #a78bfa;
    --success:      #10b981;
    --text-dark:    #0f172a;
    --text-mid:     #334155;
    --text-light:   #64748b;
    --text-white:   #ffffff;
    --bg-white:     #ffffff;
    --bg-light:     #f8fafc;
    --bg-dark:      #0f172a;
    --border:       #e2e8f0;
    --shadow-sm:    0 1px 3px rgba(0,0,0,.08);
    --shadow-md:    0 4px 12px rgba(0,0,0,.10);
    --shadow-lg:    0 10px 30px rgba(0,0,0,.12);
    --shadow-xl:    0 20px 50px rgba(0,0,0,.15);
    --r-sm: 6px;
    --r-md: 10px;
    --r-lg: 16px;
    --r-xl: 24px;
    --tr:   all .3s ease;
}

/* ---------- 全局重置 ---------- */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei", Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--bg-white);
    overflow-x: hidden;
}
a { text-decoration: none; color: inherit; transition: var(--tr); }
img { max-width:100%; height:auto; display:block;border-radius:var(--r-xl); }
ul { list-style: none; }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===================================
   导航栏
   =================================== */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(255,255,255,.96);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 var(--border);
    transition: box-shadow .3s;
}
.navbar.scrolled { box-shadow: var(--shadow-md); }

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.nav-logo a {
    font-size: 1.55rem;
    font-weight: 800;
    color: var(--text-dark);
    letter-spacing: -0.02em;
}
.nav-logo span { color: var(--primary); }

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

.nav-link {
    font-size: .93rem;
    font-weight: 500;
    color: var(--text-mid);
    padding: 6px 10px;
    border-radius: var(--r-sm);
    transition: var(--tr);
    white-space: nowrap;
}
.nav-link:hover, .nav-link.active { color: var(--primary); background: #eff6ff; }

/* 下拉菜单容器 */
.nav-item.has-dropdown { position: relative; }

.nav-dropdown-trigger { display: flex; align-items: center; gap: 4px; cursor: pointer; }
.nav-arrow { font-size: .75rem; transition: transform .25s; }
.nav-item.has-dropdown:hover .nav-arrow { transform: rotate(180deg); }

.nav-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: -12px;
    width: 300px;
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--r-lg);
    box-shadow: var(--shadow-xl);
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity .22s ease, visibility .22s ease, transform .22s ease;
    z-index: 200;
}
.nav-item.has-dropdown:hover .nav-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--r-md);
    transition: background .2s;
}
.dropdown-item:hover { background: #f0f4ff; }
.dropdown-item:hover .dropdown-text strong { color: var(--primary); }

.dropdown-icon { font-size: 1.4rem; flex-shrink: 0; }

.dropdown-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.dropdown-text strong { font-size: .93rem; color: var(--text-dark); font-weight: 600; }
.dropdown-text em { font-size: .8rem; color: var(--text-light); font-style: normal; }

.hot-badge {
    display: inline-block;
    background: #ef4444;
    color: #fff;
    font-size: .65rem;
    padding: 1px 5px;
    border-radius: 4px;
    font-weight: 700;
    vertical-align: middle;
    margin-left: 4px;
}

.dropdown-item-hot .dropdown-text strong { color: var(--geo); }

/* CTA按钮 */
.nav-cta {
    background: var(--primary) !important;
    color: #fff !important;
    padding: 8px 18px !important;
    border-radius: 20px !important;
    font-weight: 600 !important;
    box-shadow: 0 4px 12px rgba(37,99,235,.35);
}
.nav-cta:hover {
    background: var(--primary-dark) !important;
    transform: translateY(-1px);
    box-shadow: 0 6px 18px rgba(37,99,235,.4) !important;
}

/* 汉堡按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
    border-radius: var(--r-sm);
}
.nav-toggle span {
    width: 24px; height: 2px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: var(--tr);
    display: block;
}
.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.nav-toggle.active span:nth-child(2) { opacity:0; transform: scaleX(0); }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(7px,-6px); }

/* ===================================
   通用 Section 组件
   =================================== */
.section-tag {
    display: inline-block;
    background: #eff6ff;
    color: var(--primary);
    font-size: .8rem;
    font-weight: 700;
    padding: 4px 14px;
    border-radius: 20px;
    letter-spacing: .05em;
    text-transform: uppercase;
    margin-bottom: 14px;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}
.section-title {
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--text-dark);
    line-height: 1.2;
    margin-bottom: 14px;
    letter-spacing: -.02em;
}
.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 580px;
    margin: 0 auto;
}

.bg-light { background: var(--bg-light); }

/* 通用按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 11px 26px;
    border-radius: 8px;
    font-weight: 600;
    font-size: .95rem;
    transition: var(--tr);
    cursor: pointer;
    border: none;
    text-decoration: none;
    white-space: nowrap;
}
.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 14px rgba(37,99,235,.3);
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(37,99,235,.4); }

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}
.btn-outline:hover { background: var(--primary); color: #fff; }

.btn-geo {
    background: var(--geo);
    color: #fff;
    box-shadow: 0 4px 14px rgba(124,58,237,.3);
}
.btn-geo:hover { background: #6d28d9; transform: translateY(-2px); }

.btn-white {
    background: #fff;
    color: var(--primary);
    font-weight: 700;
}
.btn-white:hover { background: #f0f4ff; transform: translateY(-2px); }

.btn-outline-white {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255,255,255,.6);
}
.btn-outline-white:hover { background: rgba(255,255,255,.15); border-color: #fff; }

.btn-large { padding: 14px 36px; font-size: 1.05rem; }

/* ===================================
   Hero 轮播区域
   =================================== */
.hero-carousel {
    position: relative;
    min-height: 680px;
    overflow: hidden;
}

/* 幻灯片容器 */
.hero-slides {
    position: relative;
    width: 100%;
    min-height: 680px;
}

/* 单张幻灯片 */
.hero-slide {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.7s ease, visibility 0.7s ease;
    z-index: 1;
}
.hero-slide.active {
    opacity: 1;
    visibility: visible;
    z-index: 2;
}

/* 装饰圆 */
.hero-bg-shapes { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.shape {
    position: absolute;
    border-radius: 50%;
    opacity: .08;
}
.shape-1 { width: 600px; height: 600px; background: #fff; top: -200px; right: -100px; }
.shape-2 { width: 400px; height: 400px; background: #fff; bottom: -150px; left: -80px; }
.shape-3 { width: 250px; height: 250px; background: #fff; top: 100px; left: 30%; }

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1fr 420px;
    gap: 60px;
    align-items: center;
    width: 100%;
    position: relative;
    z-index: 2;
    padding-top: 100px;
    padding-bottom: 100px;
}

/* 通用文字样式 */
.hero-badge {
    display: inline-block;
    background: rgba(255,255,255,.12);
    color: #e0e7ff;
    font-size: .85rem;
    font-weight: 600;
    padding: 6px 16px;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,.2);
    margin-bottom: 20px;
    letter-spacing: .04em;
}
.hero-badge .hot-badge {
    display: inline-block;
    background: #ef4444;
    color: #fff;
    font-size: .65rem;
    padding: 1px 5px;
    border-radius: 4px;
    font-weight: 700;
    vertical-align: middle;
    margin-left: 4px;
}

.hero-title {
    font-size: 3rem;
    font-weight: 900;
    color: #fff;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: -.03em;
}
.hero-title .highlight {
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.1rem;
    color: rgba(255,255,255,.8);
    line-height: 1.8;
    margin-bottom: 36px;
}

.hero-buttons {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 48px;
}

/* 幻灯片1：CMS网格 */
.hero-cms-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    background: rgba(255,255,255,.08);
    border-radius: var(--r-xl);
    padding: 28px 24px;
    border: 1px solid rgba(255,255,255,.15);
    backdrop-filter: blur(8px);
}
.cms-icon { font-size: 1.1rem; display: flex; align-items: center; }
.cms-name {
    display: flex; align-items: center;
    color: rgba(255,255,255,.9);
    font-size: .95rem;
    font-weight: 500;
    padding: 8px 0;
}

/* 幻灯片2：软件界面模拟 */
.hero-software-mockup {
    background: rgba(0,0,0,.35);
    border-radius: var(--r-xl);
    overflow: hidden;
    border: 1px solid rgba(255,255,255,.15);
    backdrop-filter: blur(8px);
    width: 100%;
}
.mockup-header {
    background: rgba(0,0,0,.4);
    color: #93c5fd;
    font-size: .85rem;
    font-weight: 600;
    padding: 12px 18px;
    border-bottom: 1px solid rgba(255,255,255,.1);
}
.mockup-body { padding: 20px; display: flex; flex-direction: column; gap: 12px; }
.mockup-row {
    color: rgba(255,255,255,.85);
    font-size: .9rem;
    display: flex;
    align-items: center;
    gap: 8px;
}
.mockup-dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.mockup-dot.green { background: #34d399; }
.mockup-dot.blue  { background: #60a5fa; }
.mockup-dot.yellow { background: #fbbf24; }
.mockup-progress {
    height: 6px;
    background: rgba(255,255,255,.1);
    border-radius: 3px;
    overflow: hidden;
    margin-top: 6px;
}
.mockup-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #2563eb, #7c3aed);
    border-radius: 3px;
    transition: width 1.5s ease;
}
.mockup-stats {
    color: rgba(255,255,255,.6);
    font-size: .8rem;
    margin-top: 6px;
}

/* 幻灯片3：关键词云 */
.hero-keyword-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    padding: 20px;
    background: rgba(255,255,255,.06);
    border-radius: var(--r-xl);
    border: 1px solid rgba(255,255,255,.12);
}
.kw {
    font-weight: 700;
    padding: 6px 16px;
    background: rgba(255,255,255,.08);
    border-radius: 20px;
    animation: kwFloat 3s ease-in-out infinite;
}
.kw:nth-child(2) { animation-delay: .3s; }
.kw:nth-child(3) { animation-delay: .6s; }
.kw:nth-child(4) { animation-delay: .9s; }
.kw:nth-child(5) { animation-delay: 1.2s; }
.kw:nth-child(6) { animation-delay: .2s; }
.kw:nth-child(7) { animation-delay: .5s; }
.kw:nth-child(8) { animation-delay: .8s; }
@keyframes kwFloat {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-6px); }
}

/* 幻灯片4：GEO轨道 */
.hero-geo-orbit {
    position: relative;
    width: 280px;
    height: 280px;
    margin: 0 auto;
}
.geo-center {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%,-50%);
    width: 80px; height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, #a855f7, #6366f1);
    color: #fff;
    font-size: .85rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 30px rgba(168,85,247,.5);
    z-index: 2;
}
.geo-node {
    position: absolute;
    background: rgba(255,255,255,.12);
    border: 1px solid rgba(255,255,255,.25);
    border-radius: 20px;
    padding: 8px 14px;
    color: #fff;
    font-size: .8rem;
    font-weight: 600;
    white-space: nowrap;
    backdrop-filter: blur(6px);
    animation: geoOrbit 6s linear infinite;
}
.geo-node.n1 { top: 0;   left: 50%; transform: translateX(-50%); animation-delay: 0s; }
.geo-node.n2 { top: 50%; right: 0;  transform: translateY(-50%); animation-delay: -1.5s; }
.geo-node.n3 { bottom: 0; left: 50%; transform: translateX(-50%); animation-delay: -3s; }
.geo-node.n4 { top: 50%; left: 0;   transform: translateY(-50%); animation-delay: -4.5s; }
@keyframes geoOrbit {
    0%   { opacity: .7; transform: translate(0,0) scale(.95); }
    50%  { opacity: 1;  transform: translate(0,0) scale(1.05); }
    100% { opacity: .7; transform: translate(0,0) scale(.95); }
}

/* 左右箭头 */
.hero-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,.35);
    background: rgba(0,0,0,.25);
    color: #fff;
    font-size: 1.8rem;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background .25s, border-color .25s, transform .25s;
    backdrop-filter: blur(6px);
}
.hero-arrow:hover {
    background: rgba(255,255,255,.2);
    border-color: rgba(255,255,255,.6);
    transform: translateY(-50%) scale(1.1);
}
.hero-arrow-prev { left: 20px; }
.hero-arrow-next { right: 20px; }

/* 底部指示点 */
.hero-dots {
    position: absolute;
    bottom: 90px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    display: flex;
    gap: 10px;
}
.hero-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,.6);
    background: transparent;
    cursor: pointer;
    transition: background .3s, transform .3s, border-color .3s;
    padding: 0;
}
.hero-dot.active {
    background: #fff;
    border-color: #fff;
    transform: scale(1.3);
}
.hero-dot:hover {
    background: rgba(255,255,255,.5);
    transform: scale(1.15);
}

/* 底部波浪 */
.hero-wave {
    position: absolute;
    bottom: 0; left: 0; right: 0;
    line-height: 0;
    pointer-events: none;
    z-index: 5;
}
.hero-wave svg { width:100%; display:block; }

/* ===================================
   四大业务概览
   =================================== */
.services-overview {
    padding: 100px 0 80px;
    background: var(--bg-white);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--bg-white);
    border: 1.5px solid var(--border);
    border-radius: var(--r-xl);
    padding: 32px 24px;
    transition: var(--tr);
    display: flex;
    flex-direction: column;
    gap: 12px;
    position: relative;
    overflow: hidden;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
}
.service-card::before {
    content: attr(data-index);
    position: absolute;
    top: 16px; right: 20px;
    font-size: 3rem;
    font-weight: 900;
    color: var(--border);
    line-height: 1;
    pointer-events: none;
}
.service-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px);
}
.service-card-featured {
    background: linear-gradient(145deg, #eff6ff 0%, #dbeafe 100%);
    border-color: var(--primary-light);
}
.service-card-featured:hover { border-color: var(--primary-dark); }
.service-card-new {
    background: linear-gradient(145deg, #f5f3ff 0%, #ede9fe 100%);
    border-color: var(--geo-light);
}
.service-card-new:hover { border-color: var(--geo); }

.service-hot-label, .service-new-label {
    position: absolute;
    top: 16px; left: 20px;
    font-size: .7rem;
    font-weight: 800;
    padding: 2px 8px;
    border-radius: 4px;
    letter-spacing: .08em;
}
.service-hot-label { background: #ef4444; color: #fff; }
.service-new-label { background: var(--geo); color: #fff; }

.service-card-icon { font-size: 2.2rem; margin-top: 12px; }
.service-card h3 { font-size: 1.15rem; font-weight: 700; color: var(--text-dark); }
.service-card p  { font-size: .88rem; color: var(--text-light); line-height: 1.7; flex: 1; }

.service-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 4px;
}
.service-tags span {
    background: rgba(37,99,235,.08);
    color: var(--primary);
    font-size: .74rem;
    padding: 2px 9px;
    border-radius: 12px;
    font-weight: 500;
}
.service-card-new .service-tags span {
    background: rgba(124,58,237,.1);
    color: var(--geo);
}

.service-arrow {
    font-size: .85rem;
    color: var(--primary);
    font-weight: 600;
    margin-top: auto;
    padding-top: 8px;
}

/* ===================================
   业务详情通用布局
   =================================== */
.service-detail { padding: 90px 0; }
.service-detail-tag-center { text-align: center; margin-bottom: 60px; }

.service-detail-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 70px;
    align-items: center;
}
.service-detail-inner.reverse { direction: rtl; }
.service-detail-inner.reverse > * { direction: ltr; }

.service-detail-tag {
    display: inline-block;
    background: #eff6ff;
    color: var(--primary);
    font-size: .78rem;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 4px;
    letter-spacing: .06em;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.service-detail-content h2 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 14px;
    letter-spacing: -.02em;
    color: var(--text-dark);
}
.service-detail-lead {
    font-size: 1.1rem;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 32px;
}

/* ===================================
   业务一：网站搭建
   =================================== */
.cms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 10px;
    margin-bottom: 28px;
}
.cms-item {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--r-md);
    padding: 10px 8px;
    text-align: center;
    font-size: .84rem;
    font-weight: 600;
    color: var(--text-mid);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    transition: border-color .2s, box-shadow .2s;
}
.cms-item:hover { border-color: var(--primary); box-shadow: var(--shadow-sm); }
.cms-icon { font-size: 1.3rem; }

.service-features-list { margin-bottom: 32px; display: flex; flex-direction: column; gap: 10px; }
.sfl-item { font-size: .95rem; color: var(--text-mid); font-weight: 500; }

/* 网页骨架示意图 */
.build-visual {
    display: flex;
    justify-content: center;
}
.bv-window {
    width: 100%;
    max-width: 420px;
    background: var(--bg-white);
    border-radius: var(--r-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid var(--border);
}
.bv-bar {
    background: #f1f5f9;
    padding: 10px 16px;
    display: flex;
    gap: 6px;
    border-bottom: 1px solid var(--border);
}
.bv-bar span {
    width: 10px; height: 10px;
    border-radius: 50%;
    background: var(--border);
    display: block;
}
.bv-bar span:nth-child(1) { background: #fc615d; }
.bv-bar span:nth-child(2) { background: #fdbc40; }
.bv-bar span:nth-child(3) { background: #35cd4b; }
.bv-content { padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.bv-hero-block {
    height: 100px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: var(--r-md);
    opacity: .8;
}
.bv-rows { display: flex; flex-direction: column; gap: 8px; }
.bv-row {
    height: 8px;
    background: var(--border);
    border-radius: 4px;
}
.bv-row-short { width: 70%; }
.bv-cards {
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 8px;
    margin-top: 4px;
}
.bv-card {
    height: 60px;
    background: #f1f5f9;
    border-radius: var(--r-md);
    border: 1px solid var(--border);
}

/* ===================================
   业务二：SEO软件（主展示）
   =================================== */
.software-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: start;
}

.software-info { display: flex; flex-direction: column; gap: 20px; }

.info-card {
    padding: 22px;
    background: var(--bg-light);
    border-radius: var(--r-lg);
    border-left: 4px solid var(--primary);
    transition: var(--tr);
}
.info-card:hover { transform: translateX(4px); box-shadow: var(--shadow-md); }
.info-icon { font-size: 1.8rem; margin-bottom: 10px; }
.info-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 7px; color: var(--text-dark); }
.info-card p  { font-size: .88rem; color: var(--text-light); line-height: 1.7; }

.software-media { display: flex; flex-direction: column; gap: 24px; }

/* 图片占位 */
.preview-placeholder {
    width: 100%;
    min-height: 320px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: var(--r-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    position: relative;
}
.placeholder-content { text-align: center; color: #fff; }
.placeholder-icon-large { font-size: 3.5rem;  }
.placeholder-content h3 { font-size: 1.4rem; margin-bottom: 8px; }
.placeholder-content p  { font-size: .95rem; opacity: .9; }
.placeholder-detail { font-size: .85rem !important; opacity: .75 !important; margin-top: 6px !important; }
.placeholder-features {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 20px;
}
.placeholder-features span { font-size: .9rem; opacity: .85; }

/* 视频块 */
.video-block { }
.video-block-title {
    font-size: .9rem;
    font-weight: 700;
    color: var(--text-mid);
    margin-bottom: 10px;
    padding-left: 4px;
}

.video-wrapper {
    position: relative;
    border-radius: var(--r-xl);
    overflow: hidden;
    background: #0f172a;
    box-shadow: var(--shadow-lg);
    aspect-ratio: 16/9;
}
.demo-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.video-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(37,99,235,.85), rgba(99,102,241,.85));
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: opacity .3s;
}
.video-overlay.hidden { opacity: 0; pointer-events: none; }
.video-placeholder { text-align: center; color: #fff; padding: 20px; }
.play-icon {
    width: 64px; height: 64px;
    background: rgba(255,255,255,.2);
    border: 2px solid rgba(255,255,255,.6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin: 0 auto 14px;
    padding-left: 4px;
    transition: background .2s;
}
.video-overlay:hover .play-icon { background: rgba(255,255,255,.35); }
.video-placeholder p { font-size: .9rem; margin: 4px 0; }
.video-hint { font-size: .78rem !important; opacity: .7; }
.video-note { font-size: .8rem !important; opacity: .75; }

/* ===================================
   业务三：SEO优化
   =================================== */
.seo-visual {
    background: var(--bg-white);
    border-radius: var(--r-xl);
    padding: 30px;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.keyword-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    padding: 10px 0;
}
.kw {
    padding: 7px 16px;
    border-radius: 20px;
    font-size: .9rem;
    font-weight: 600;
    transition: transform .2s;
    cursor: default;
}
.kw:hover { transform: scale(1.08); }
.kw-1 { background: #dbeafe; color: #1d4ed8; }
.kw-2 { background: #dcfce7; color: #15803d; }
.kw-3 { background: #fef3c7; color: #b45309; }
.kw-4 { background: #fce7f3; color: #9d174d; }
.kw-5 { background: #ede9fe; color: #5b21b6; }
.kw-6 { background: #fee2e2; color: #991b1b; }
.kw-7 { background: #e0f2fe; color: #0369a1; }
.kw-8 { background: #f0fdf4; color: #166534; }

.seo-chart {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 14px;
    height: 120px;
    padding: 0 20px;
}
.seo-bar {
    flex: 1;
    max-width: 60px;
    height: var(--h);
    background: linear-gradient(to top, var(--primary), var(--primary-light));
    border-radius: 6px 6px 0 0;
    text-align: center;
    font-size: .72rem;
    font-weight: 700;
    color: var(--primary);
    padding-bottom: 2px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    transition: opacity .2s;
    position: relative;
}
.seo-bar::after {
    content: attr(style);
    display: none;
}

.seo-modules { display: flex; flex-direction: column; gap: 20px; margin-bottom: 32px; }
.seo-module {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    padding: 18px;
    background: var(--bg-white);
    border-radius: var(--r-lg);
    border: 1px solid var(--border);
    transition: var(--tr);
}
.seo-module:hover { border-color: var(--primary); box-shadow: var(--shadow-sm); }
.seo-module-icon { font-size: 1.6rem; flex-shrink: 0; }
.seo-module h4 { font-size: 1rem; font-weight: 700; margin-bottom: 6px; color: var(--text-dark); }
.seo-module p  { font-size: .88rem; color: var(--text-light); line-height: 1.6; }

/* ===================================
   业务四：AI GEO
   =================================== */
.geo-section {
    background: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #4c1d95 100%);
    color: #fff;
}
.geo-section .service-detail-tag {
    background: rgba(167,139,250,.2);
    color: var(--geo-light);
}
.geo-section .service-detail-content h2 { color: #fff; }
.geo-section .service-detail-lead { color: rgba(255,255,255,.8); }

.geo-features-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 32px;
}
.geo-feature {
    background: rgba(255,255,255,.08);
    border: 1px solid rgba(255,255,255,.15);
    border-radius: var(--r-lg);
    padding: 20px;
    transition: background .2s;
}
.geo-feature:hover { background: rgba(255,255,255,.14); }
.geo-feature-icon { font-size: 1.6rem; margin-bottom: 10px; }
.geo-feature h4 { font-size: .95rem; font-weight: 700; color: #fff; margin-bottom: 6px; }
.geo-feature p  { font-size: .83rem; color: rgba(255,255,255,.75); line-height: 1.6; }

/* GEO轨道动画 */
.geo-visual-wrap { display: flex; align-items: center; justify-content: center; }
.geo-visual {
    width: 320px;
    height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}
.geo-orbit {
    position: relative;
    width: 100%;
    height: 100%;
}
.geo-center {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 80px; height: 80px;
    background: linear-gradient(135deg, var(--geo), #6d28d9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.3rem;
    font-weight: 900;
    box-shadow: 0 0 40px rgba(124,58,237,.5);
    z-index: 2;
}
.geo-orbit::before {
    content: '';
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 240px; height: 240px;
    border: 1px dashed rgba(255,255,255,.2);
    border-radius: 50%;
}
.geo-node {
    position: absolute;
    background: rgba(255,255,255,.12);
    border: 1px solid rgba(255,255,255,.25);
    color: #fff;
    font-size: .8rem;
    font-weight: 600;
    padding: 7px 14px;
    border-radius: 20px;
    white-space: nowrap;
    backdrop-filter: blur(4px);
    animation: geo-float 4s ease-in-out infinite;
}
.geo-n1 { top: 5%;  left: 50%; transform: translateX(-50%); animation-delay: 0s; }
.geo-n2 { top: 45%; right: 2%; transform: translateY(-50%); animation-delay: 1s; }
.geo-n3 { bottom: 5%; left: 50%; transform: translateX(-50%); animation-delay: 2s; }
.geo-n4 { top: 45%; left: 2%; transform: translateY(-50%); animation-delay: 3s; }

@keyframes geo-float {
    0%, 100% { opacity: .8; transform: translateX(-50%) translateY(0); }
    50%       { opacity: 1;  transform: translateX(-50%) translateY(-4px); }
}
.geo-n2 { animation-name: geo-float-r; }
.geo-n4 { animation-name: geo-float-l; }
@keyframes geo-float-r {
    0%, 100% { opacity:.8; transform: translateY(-50%) translateX(0); }
    50%       { opacity:1;  transform: translateY(-50%) translateX(4px); }
}
@keyframes geo-float-l {
    0%, 100% { opacity:.8; transform: translateY(-50%) translateX(0); }
    50%       { opacity:1;  transform: translateY(-50%) translateX(-4px); }
}

/* ===================================
   成功案例
   =================================== */
.cases-section { padding: 90px 0; }
.cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.case-card {
    background: var(--bg-white);
    border-radius: var(--r-xl);
    padding: 26px;
    border: 1.5px solid var(--border);
    transition: var(--tr);
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.case-card:hover { border-color: var(--primary); box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.case-card-geo:hover { border-color: var(--geo); }

.case-industry {
    display: inline-block;
    background: #eff6ff;
    color: var(--primary);
    font-size: .75rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 4px;
    width: fit-content;
}
.geo-tag-label { background: #f5f3ff !important; color: var(--geo) !important; }

.case-card h4 { font-size: .97rem; font-weight: 700; color: var(--text-dark); }
.case-card p  { font-size: .85rem; color: var(--text-light); line-height: 1.65; flex: 1; }
.case-result {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding-top: 8px;
    border-top: 1px solid var(--border);
}
.case-result span { font-size: .82rem; color: var(--text-mid); font-weight: 600; }

/* ===================================
   新闻资讯
   =================================== */
.news-section { padding: 90px 0; background: var(--bg-white); }
.news-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    grid-template-rows: auto auto;
    gap: 20px;
    margin-bottom: 40px;
}
.news-card {
    background: var(--bg-white);
    border: 1.5px solid var(--border);
    border-radius: var(--r-xl);
    padding: 24px;
    transition: var(--tr);
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.news-card:hover { border-color: var(--primary); box-shadow: var(--shadow-md); }
.news-card-featured { grid-row: span 2; background: linear-gradient(145deg, #f0f4ff, #e8f0fe); }

.news-cat {
    display: inline-block;
    background: #eff6ff;
    color: var(--primary);
    font-size: .75rem;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 4px;
    width: fit-content;
}
.news-card h4 { font-size: 1rem; font-weight: 700; color: var(--text-dark); line-height: 1.5; }
.news-card p  { font-size: .87rem; color: var(--text-light); line-height: 1.65; flex: 1; }
.news-meta {
    display: flex;
    gap: 16px;
    font-size: .78rem;
    color: var(--text-light);
    padding-top: 8px;
    border-top: 1px solid var(--border);
    margin-top: auto;
}
.news-more { text-align: center; }

/* ===================================
   关于我们
   =================================== */
.about-section { padding: 90px 0; }
.about-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 70px;
    align-items: center;
}
.about-content .section-tag { display: inline-block; margin-bottom: 16px; }
.about-content h2 { font-size: 2.2rem; font-weight: 800; line-height: 1.2; margin-bottom: 20px; letter-spacing: -.02em; }
.about-content > p { font-size: 1rem; color: var(--text-light); line-height: 1.8; margin-bottom: 32px; }

.about-values { display: flex; flex-direction: column; gap: 16px; }
.about-value {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}
.av-icon { font-size: 1.5rem; flex-shrink: 0; }
.about-value strong { display: block; font-weight: 700; margin-bottom: 3px; }
.about-value p { font-size: .87rem; color: var(--text-light); margin: 0; }

.about-stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.about-stat {
    background: var(--bg-white);
    border-radius: var(--r-xl);
    border: 1.5px solid var(--border);
    padding: 30px 24px;
    text-align: center;
    transition: var(--tr);
}
.about-stat:hover { border-color: var(--primary); box-shadow: var(--shadow-md); }
.as-number {
    font-size: 2.4rem;
    font-weight: 900;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 6px;
}
.as-number span { font-size: 1.4rem; }
.as-label { font-size: .85rem; color: var(--text-light); }

/* ===================================
   CTA
   =================================== */
.cta-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, #0ea5e9 100%);
}
.cta-content { text-align: center; }
.cta-content h2 {
    font-size: 2.4rem;
    font-weight: 900;
    color: #fff;
    margin-bottom: 12px;
    letter-spacing: -.02em;
}
.cta-content p { font-size: 1.1rem; color: rgba(255,255,255,.85); margin-bottom: 36px; }
.cta-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--bg-dark);
    padding: 60px 0 0;
    color: rgba(255,255,255,.75);
}
.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.2fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,.1);
}

.footer-brand h3 {
    font-size: 1.6rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 10px;
}
.footer-brand h3 span { color: var(--accent); }
.footer-brand > p { font-size: .9rem; line-height: 1.8; margin-bottom: 18px; color: rgba(255,255,255,.65); }
.footer-contact { display: flex; flex-direction: column; gap: 6px; }
.footer-contact p { font-size: .85rem; color: rgba(255,255,255,.65); }

.footer-section h4 { font-size: .95rem; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-section ul { display: flex; flex-direction: column; gap: 10px; }
.footer-section ul li a {
    font-size: .87rem;
    color: rgba(255,255,255,.6);
    transition: color .2s;
}
.footer-section ul li a:hover { color: #fff; }

.social-links { display: flex; flex-direction: column; gap: 8px; }
.social-link {
    font-size: .87rem;
    color: rgba(255,255,255,.6);
    padding: 8px 14px;
    background: rgba(255,255,255,.06);
    border-radius: var(--r-md);
    border: 1px solid rgba(255,255,255,.1);
    transition: var(--tr);
    text-align: center;
}
.social-link:hover { background: rgba(255,255,255,.14); color: #fff; }

/* 底部二维码网格 */
.qr-grid {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: nowrap;
}
.qr-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}
.qr-placeholder {
    width: 100px;
    height: 100px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;

    gap: 2px;
    cursor: pointer;
    transition: border-color .25s, background .25s;
}
.qr-placeholder:hover {
    border-color: rgba(255,255,255,.55);
    background: rgba(255,255,255,.06);
}
.qr-emoji {
    font-size: 1.5rem;
    line-height: 1;
}
.qr-text {
    font-size: .6rem;
    color: rgba(255,255,255,.45);
    line-height: 1;
}
.qr-label {
    font-size: .78rem;
    color: rgba(255,255,255,.6);
    margin: 0;
    text-align: center;
}

.footer-bottom {
    padding: 18px 0;
    text-align: center;
    font-size: .8rem;
    color: rgba(255,255,255,.4);
}

/* ===================================
   返回顶部 & Lightbox
   =================================== */
.back-to-top {
    position: fixed;
    bottom: 30px; right: 24px;
    width: 44px; height: 44px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity .3s, visibility .3s, transform .3s;
    z-index: 900;
}
.back-to-top.visible { opacity:1; visibility:visible; transform:translateY(0); }
.back-to-top:hover { background: var(--primary-dark); }

/* Lightbox */
.lightbox-trigger { cursor: zoom-in; position: relative; transition: transform .25s, box-shadow .25s; }
.lightbox-trigger:hover { transform: scale(1.015); box-shadow: 0 20px 50px rgba(37,99,235,.25); }
.lightbox-trigger::after {
    content: '🔍 点击放大';
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    font-size: .95rem; font-weight: 700; color: #fff;
    background: rgba(15,23,42,.45);
    border-radius: inherit;
    opacity: 0; transition: opacity .25s; pointer-events: none;
}
.lightbox-trigger:hover::after { opacity: 1; }

.lightbox-overlay {
    position: fixed; inset: 0; z-index: 99999;
    background: rgba(10,15,30,.92);
    display: flex; align-items: center; justify-content: center;
    padding: 16px; opacity: 0; visibility: hidden;
    transition: opacity .3s, visibility .3s;
    backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
    cursor: zoom-out;
}
.lightbox-overlay.active { opacity: 1; visibility: visible; }

.lightbox-inner {
    position: relative;
    max-width: min(90vw, 1100px); max-height: 90vh;
    display: flex; flex-direction: column; align-items: center;
    cursor: default;
    transform: scale(.88);
    transition: transform .3s cubic-bezier(.34,1.56,.64,1);
}
.lightbox-overlay.active .lightbox-inner { transform: scale(1); }

.lightbox-img {
    max-width: 100%; max-height: 80vh;
    border-radius: var(--r-lg);
    box-shadow: 0 30px 80px rgba(0,0,0,.6);
    object-fit: contain; display: block;
    user-select: none; -webkit-user-drag: none;
}
.lightbox-placeholder-view {
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: var(--r-xl); padding: 60px 80px; text-align: center; color: #fff;
    box-shadow: 0 30px 80px rgba(0,0,0,.5); min-width: 380px;
}
.lightbox-placeholder-view .ph-icon { font-size: 4.5rem; display: block; margin-bottom: 18px; }
.lightbox-placeholder-view h3 { font-size: 1.5rem; margin-bottom: 10px; }
.lightbox-placeholder-view p { font-size: .95rem; opacity: .85; }

.lightbox-close {
    position: fixed; top: 20px; right: 24px;
    width: 44px; height: 44px; border-radius: 50%;
    background: rgba(255,255,255,.15); border: 2px solid rgba(255,255,255,.3);
    color: #fff; font-size: 1.3rem; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: background .2s, transform .2s; z-index: 100000;
}
.lightbox-close:hover { background: rgba(255,255,255,.28); transform: rotate(90deg) scale(1.1); }
.lightbox-caption { margin-top: 14px; color: rgba(255,255,255,.7); font-size: .88rem; }

/* ===================================
   滚动入场动画
   =================================== */
.fade-in-up {
    animation: fadeInUp .5s ease both;
}
@keyframes fadeInUp {
    from { opacity:0; transform:translateY(20px); }
    to   { opacity:1; transform:translateY(0); }
}

/* ===================================
   桌面大屏适配
   =================================== */
/* ===================================
   业务二按钮 & 新闻3列
   =================================== */
/* 业务二按钮居中 */
.software-btn-row { text-align: center; margin-top: 28px; }

/* 新闻3列布局 */
.news-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 32px;
}
.news-column {
    min-width: 0;
}
.news-column-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 18px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary);
}
.news-list {
    list-style: none;
    padding: 0;
    margin: 0;
}
.news-list li {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}
.news-list li:last-child { border-bottom: none; }
.news-list a {
    color: var(--text-dark);
    font-size: .92rem;
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    transition: color .2s;
}
.news-list a:hover { color: var(--primary); }
.news-list span {
    color: var(--text-light);
    font-size: .78rem;
    flex-shrink: 0;
}

@media (min-width: 1300px) {
    .hero-title { font-size: 3.4rem; }
}

/* ===================================
   平板适配 ( 768–1024px )
   =================================== */
@media (max-width: 1024px) {
    .services-grid  { grid-template-columns: 1fr 1fr; }
    .cases-grid     { grid-template-columns: 1fr 1fr; }
    .hero-container { grid-template-columns: 1fr; }
    .hero-visual    { display: none; }
    .hero-title     { font-size: 2.4rem; }
    .software-showcase,
    .service-detail-inner { grid-template-columns: 1fr; gap: 40px; }
    .service-detail-inner.reverse { direction: ltr; }
    .news-grid      { grid-template-columns: 1fr; }
    .news-card-featured { grid-row: span 1; }
    .about-inner    { grid-template-columns: 1fr; gap: 40px; }
    .footer-content { grid-template-columns: 1fr 1fr; }
}

/* ===================================
   移动端 ( ≤768px )
   =================================== */
@media (max-width: 768px) {

    /* ===== Hero 轮播 移动端 ===== */
    .hero-carousel { min-height: auto; }
    .hero-slides  { min-height: 520px; }
    .hero-slide   { min-height: 520px; }
    .hero-container {
        grid-template-columns: 1fr;
        gap: 24px;
        padding: 90px 20px 110px;
        text-align: center;
    }
    .hero-content { display: flex; flex-direction: column; align-items: center; }
    .hero-title   { font-size: 1.9rem; }
    .hero-description { font-size: .95rem; }
    .hero-description br { display: none; }
    .hero-buttons { justify-content: center; }
    .hero-visual  { display: flex; justify-content: center; }
    .hero-cms-grid {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
        padding: 18px 14px;
        max-width: 380px;
        width: 100%;
    }
    .cms-name { font-size: .82rem; }
    .hero-software-mockup { max-width: 380px; width: 100%; }
    .hero-keyword-cloud  { gap: 10px; padding: 16px; min-height: 160px; }
    .hero-geo-orbit { width: 220px; height: 220px; }
    .geo-center { width: 60px; height: 60px; font-size: .75rem; }
    .geo-node   { font-size: .7rem; padding: 6px 10px; }
    .hero-arrow     { width: 36px; height: 36px; font-size: 1.4rem; }
    .hero-arrow-prev { left: 8px; }
    .hero-arrow-next { right: 8px; }
    .hero-dots { bottom: 60px; }
    .hero-dot  { width: 10px; height: 10px; }

    /* 导航 */
    .nav-menu {
        position: fixed;
        top: 68px; left: 0; right: 0;
        max-height: 0; overflow: hidden;
        background: var(--bg-white);
        flex-direction: column;
        padding: 0 16px;
        transition: max-height .35s cubic-bezier(.4,0,.2,1), padding .35s, box-shadow .3s;
        box-shadow: none; gap: 0;
        border-top: 1px solid var(--border);
        align-items: stretch;
    }
    .nav-menu.active {
        max-height: 540px;
        padding: 12px 16px 20px;
        box-shadow: 0 8px 24px rgba(0,0,0,.12);
    }
    .nav-toggle { display: flex; }

    .nav-item.has-dropdown { flex-direction: column; }
    .nav-dropdown-trigger { justify-content: space-between; width: 100%; }
    .nav-dropdown {
        position: static; width: 100%; opacity: 1; visibility: visible;
        transform: none; box-shadow: none;
        border: none; border-radius: 0; padding: 4px 0 4px 16px;
        max-height: 0; overflow: hidden;
        transition: max-height .3s ease;
        background: var(--bg-light);
    }
    .nav-item.has-dropdown.open .nav-dropdown { max-height: 300px; }
    .nav-item.has-dropdown.open .nav-arrow   { transform: rotate(180deg); }

    .nav-menu .nav-link:not(.nav-cta) {
        display: flex; align-items: center;
        padding: 13px 4px; font-size: 1rem; font-weight: 500;
        border-bottom: 1px solid var(--border);
        border-radius: 0;
    }
    .nav-menu .nav-link:not(.nav-cta):hover { color: var(--primary); background: #f0f4ff; padding-left: 12px; border-radius: var(--r-sm); }
    .nav-menu .nav-link::after { display: none; }
    .nav-menu .nav-cta {
        display: block; margin-top: 14px; padding: 13px 20px !important;
        text-align: center; font-size: 1rem; border-radius: 8px !important;
    }

    /* Hero */
    .hero { padding: 88px 0 0; min-height: auto; }
    .hero-title { font-size: 1.9rem; }
    .hero-stats { flex-direction: column; gap: 16px; }
    .stat-item { display: flex; gap: 12px; align-items: center; }
    .stat-number { font-size: 1.4rem; }

    /* Sections */
    .section-title { font-size: 1.9rem; }
    .services-grid { grid-template-columns: 1fr; }
    .cases-grid    { grid-template-columns: 1fr; }
    .geo-features-grid { grid-template-columns: 1fr; }
    .about-stats-grid  { grid-template-columns: 1fr 1fr; gap: 12px; }

    /* Footer */
    .footer-content { grid-template-columns: 1fr 1fr; gap: 0; }
    .footer-brand {
        grid-column: 1 / -1; padding-bottom: 20px;
        border-bottom: 1px solid rgba(255,255,255,.1); margin-bottom: 4px;
    }
    .footer-contact { flex-direction: row; flex-wrap: wrap; gap: 6px 16px; }
    .footer-contact p { font-size: .82rem; margin: 0; }
    .footer-section:not(.footer-brand) { padding: 16px 8px; }
    .footer-section:nth-child(3) { border-left: 1px solid rgba(255,255,255,.1); }
    .footer-section:last-child { grid-column: 1 / -1; border-top: 1px solid rgba(255,255,255,.1); }
    .footer-section:last-child .social-links { flex-direction: row; flex-wrap: wrap; gap: 8px; }
    .footer-section:last-child .social-link { padding: 6px 14px; border-radius: 20px; font-size: .83rem; }
    .footer-bottom { padding: 14px 0; font-size: .76rem; }

    /* Lightbox */
    .lightbox-placeholder-view { min-width: unset; padding: 36px 24px; }
    .lightbox-close { top: 10px; right: 10px; }
    .cta-buttons { flex-direction: column; align-items: center; }
    .hero-buttons { flex-direction: column; }
    .btn { width: 100%; text-align: center; }
    /* 新闻3列移动端 */
    .news-column { margin-bottom: 24px; }
    .news-column:last-child { margin-bottom: 0; }
    .news-column-title { font-size: 1rem; }
    .news-list li { padding: 8px 0; }
}

/* ===================================
   小屏 ( ≤480px )
   =================================== */
@media (max-width: 480px) {
    .hero-slides  { min-height: 1000px; }
    .hero-slide   { min-height: 480px; }
    .hero-container { padding: 80px 16px 100px; }
    .hero-title   { font-size: 1.65rem; }
    .hero-description { font-size: .88rem; }
    .hero-cms-grid { max-width: 100%; }
    .hero-software-mockup { max-width: 100%; }
    .hero-keyword-cloud  { gap: 8px; }
    .kw { font-size: .85rem !important; padding: 4px 10px; }
    .hero-geo-orbit { width: 180px; height: 180px; }
    .geo-center { width: 50px; height: 50px; font-size: .65rem; }
    .geo-node   { font-size: .62rem; padding: 5px 8px; }
    .hero-arrow { display: none; }  /* 小屏隐藏箭头，用滑动手势 */
    .hero-dots { bottom: 50px; gap: 8px; }
    .hero-dot  { width: 8px; height: 8px; }
    .section-title { font-size: 1.65rem; }
    .footer-content { grid-template-columns: 1fr 1fr; }
    .footer-section:nth-child(3) { border-left: none; border-top: 1px solid rgba(255,255,255,.1); }
    .about-stats-grid { grid-template-columns: 1fr 1fr; }
    .back-to-top { bottom: 18px; right: 14px; }

    /* 底部二维码在一行展示 */
    .qr-grid { gap: 10px; justify-content: center; }
    .qr-placeholder { width: 70px; height: 70px; }
    .qr-emoji { font-size: 1.2rem; }
    .qr-text { font-size: .55rem; }
    .qr-label { font-size: .7rem; }
}