/* ========================================
   尧图网站定制 - 营销长页组件库
   商务科技风：深空蓝 + 银灰 + 浅蓝
   统一视觉语言下的差异化组件
   ======================================== */

/* ---------- 通用辅助 ---------- */
.container { width: min(1200px, 92%); margin: 0 auto; }
.w100 { width: 100%; height: auto; }
.section { padding: 5rem 0; }
.section-alt { background: var(--light-cream); }
.section-dark { background: var(--gradient-primary); color: #fff; }
.section-gold { background: linear-gradient(135deg, #1E5BB8 0%, #38BDF8 100%); padding: 2.5rem 0; }
.text-center { text-align: center; }
.text-red { color: var(--tibetan-red); }
.text-blue { color: var(--tibetan-blue); }
.text-gold { color: var(--tibetan-yellow); }
.text-white { color: #fff; }
.mt-1 { margin-top: 1rem; } .mt-2 { margin-top: 2rem; } .mt-3 { margin-top: 3rem; } .mt-4 { margin-top: 4rem; }
.mb-1 { margin-bottom: 1rem; } .mb-2 { margin-bottom: 2rem; } .mb-3 { margin-bottom: 3rem; } .mb-4 { margin-bottom: 4rem; }

/* 区块标题 */
.section-head { text-align: center; max-width: 780px; margin: 0 auto 3rem; }
.kicker {
    display: inline-block; background: rgba(30,91,184,.1); color: var(--tibetan-red);
    padding: .35rem 1.2rem; border-radius: 30px; font-size: .85rem; font-weight: 600;
    letter-spacing: 2px; margin-bottom: 1rem;
}
.kicker.gold { background: rgba(56,189,248,.18); color: #0E5A9E; }
.banner .kicker { background: rgba(56,189,248,.2); color: var(--tibetan-yellow); margin-bottom: 1.5rem; }
.section-head h2 { font-size: 2.3rem; color: var(--tibetan-blue); margin-bottom: .8rem; line-height: 1.3; }
.section-head h2 span { color: var(--tibetan-red); }
.section-head h2 em { font-style: normal; color: var(--tibetan-red); }
.section-head p { color: #666; font-size: 1.05rem; line-height: 1.9; }
.section-head.light h2 { color: #fff; }
.section-head.light p { color: rgba(255,255,255,.85); }
.section-head.left { text-align: left; margin-left: 0; }

/* ---------- 面包屑 ---------- */
.breadcrumb { padding: 1rem 0; font-size: .88rem; color: #999; background: #fff; border-bottom: 1px solid #E2E8F0; }
.breadcrumb a { color: var(--tibetan-red); }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb span.sep { margin: 0 .6rem; color: #ccc; }

/* ---------- 顶部横幅（营销页） ---------- */
.banner {
    position: relative; padding: 9rem 0 4.5rem; text-align: center; color: #fff;
    background: var(--gradient-primary); overflow: hidden;
}
.banner::before { content:''; position:absolute; inset:0;
    background:
        radial-gradient(circle at 15% 20%, rgba(56,189,248,.25) 0%, transparent 45%),
        radial-gradient(circle at 85% 80%, rgba(56,189,248,.18) 0%, transparent 45%);
}
.banner.bg-img::after { content:''; position:absolute; inset:0; background: linear-gradient(135deg, rgba(11,30,59,.88), rgba(30,58,110,.88)); }
.banner.bg-img { background-size: cover; background-position: center; }
.banner > * { position: relative; z-index: 2; }
.banner h1 { font-size: 3rem; font-weight: 800; margin-bottom: 1.2rem; line-height: 1.25; }
.banner h1 em { font-style: normal; color: var(--tibetan-yellow); }
.banner p { font-size: 1.15rem; max-width: 760px; margin: 0 auto 2rem; line-height: 1.9; opacity: .95; }
.banner .banner-meta { font-size: .9rem; opacity: .75; margin-top: 1.2rem; letter-spacing: 1px; }
.banner-split { text-align: left; display: grid; grid-template-columns: 1.05fr .95fr; gap: 3rem; align-items: center; padding: 8.5rem 0 4.5rem; }
.banner-split h1 { font-size: 2.7rem; line-height: 1.25; margin-bottom: 1.2rem; }
.banner-split p { margin: 0 0 1.8rem; }
.banner-split .banner-img { border-radius: 22px; overflow: hidden; box-shadow: 0 24px 60px rgba(0,0,0,.35); transform: rotate(1.5deg); }
.banner-split .banner-img img { width: 100%; height: 400px; object-fit: cover; display: block; }
.banner-btns { display: flex; gap: 1rem; flex-wrap: wrap; justify-content: center; }
.banner-split .banner-btns { justify-content: flex-start; }

/* ---------- 双栏图文 ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
.split-reverse .split-img { order: 2; }
.split-img { border-radius: 22px; overflow: hidden; box-shadow: var(--shadow-soft); }
.split-img img { width: 100%; height: 430px; object-fit: cover; display: block; transition: transform .6s ease; }
.split-img:hover img { transform: scale(1.04); }
.split-text h3 { font-size: 1.9rem; color: var(--tibetan-blue); margin-bottom: 1.2rem; line-height: 1.35; }
.split-text p { color: #555; line-height: 2; margin-bottom: 1.2rem; font-size: 1.03rem; }
.split-text ul.ticks { margin: 1.2rem 0; }
.split-text ul.ticks li { padding: .45rem 0 .45rem 2rem; position: relative; color: #444; }
.split-text ul.ticks li::before {
    content: '✦'; position: absolute; left: 0; top: .45rem; color: var(--tibetan-red); font-weight: 700;
}
.split-badge { display: inline-block; background: var(--tibetan-red); color: #fff; border-radius: 30px;
    padding: .3rem 1.1rem; font-size: .8rem; letter-spacing: 1px; margin-bottom: 1.2rem; }
.split-badge.blue { background: var(--tibetan-blue); }

/* ---------- 特性卡片 ---------- */
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.8rem; }
.feature { background: #fff; border-radius: 20px; padding: 2.2rem 1.8rem; box-shadow: var(--shadow-soft);
    transition: all .4s ease; border: 1px solid #E2E8F0; position: relative; overflow: hidden; }
.feature::after { content:''; position:absolute; top:0; left:0; width:100%; height:4px;
    background: linear-gradient(90deg, var(--tibetan-red), var(--tibetan-yellow)); transform: scaleX(0); transform-origin:left; transition: transform .4s ease; }
.feature:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); }
.feature:hover::after { transform: scaleX(1); }
.feature .f-icon { width: 64px; height: 64px; border-radius: 18px; display: flex; align-items: center; justify-content: center;
    font-size: 1.8rem; background: linear-gradient(135deg, rgba(30,91,184,.1), rgba(56,189,248,.2)); margin-bottom: 1.3rem; }
.feature h4 { font-size: 1.18rem; color: var(--tibetan-blue); margin-bottom: .8rem; }
.feature p { color: #666; font-size: .95rem; line-height: 1.8; }
.feature .f-tag { position: absolute; top: 1.2rem; right: 1.2rem; background: rgba(56,189,248,.2);
    color: #0E5A9E; font-size: .75rem; padding: .2rem .7rem; border-radius: 20px; }
.features.alt .feature { background: var(--light-cream); }

/* 横向滚动数字大图 */
.features-big { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px,1fr)); gap: 1.6rem; }
.feature-big { background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.18); border-radius: 20px;
    padding: 2.2rem 1.6rem; text-align: center; color: #fff; backdrop-filter: blur(6px); transition: all .4s ease; }
.feature-big:hover { background: rgba(255,255,255,.14); transform: translateY(-6px); }
.feature-big .f-icon { font-size: 2.4rem; margin-bottom: 1rem; }
.feature-big h4 { color: var(--tibetan-yellow); font-size: 1.15rem; margin-bottom: .7rem; }
.feature-big p { font-size: .92rem; line-height: 1.7; opacity: .9; }

/* ---------- 数字统计条 ---------- */
.stats-band { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px,1fr)); gap: 2rem;
    padding: 3.5rem 0; }
.stats-band .stat { text-align: center; color: #fff; position: relative; }
.stats-band .stat + .stat::before { content:''; position:absolute; left:-1rem; top:15%; height:70%; width:1px; background: rgba(255,255,255,.2); }
.stats-band .num { font-size: 2.9rem; font-weight: 800; color: var(--tibetan-yellow); line-height: 1; }
.stats-band .lbl { margin-top: .6rem; font-size: .95rem; opacity: .9; }
.stats-band.gold-bg .num { color: #fff; text-shadow: 0 2px 8px rgba(11,30,59,.25); }
.stats-band.light-bg .num { color: var(--tibetan-red); }
.stats-band.light-bg .stat .lbl { color: #555; }

/* ---------- 步骤流程 ---------- */
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px,1fr)); gap: 1.6rem; counter-reset: step; }
.step { background: #fff; border-radius: 20px; padding: 2rem 1.6rem; text-align: center; box-shadow: var(--shadow-soft);
    position: relative; transition: all .4s ease; }
.step:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.step .step-no { width: 54px; height: 54px; margin: 0 auto 1.2rem; border-radius: 50%;
    background: var(--gradient-primary); color: var(--tibetan-yellow); font-size: 1.4rem; font-weight: 800;
    display: flex; align-items: center; justify-content: center; }
.step h4 { color: var(--tibetan-blue); font-size: 1.15rem; margin-bottom: .7rem; }
.step p { color: #666; font-size: .92rem; line-height: 1.75; }
.step::after { content:'→'; position: absolute; top: 50%; right: -1.1rem; transform: translateY(-50%);
    color: var(--tibetan-yellow); font-size: 1.5rem; font-weight: 800; z-index: 2; }
.step:last-child::after { display: none; }
.steps.vertical { grid-template-columns: 1fr; max-width: 820px; margin: 0 auto; }
.steps.vertical .step { display: grid; grid-template-columns: 90px 1fr; gap: 1.5rem; text-align: left; align-items: center; }
.steps.vertical .step .step-no { margin: 0; }

/* ---------- 时间线 ---------- */
.timeline { position: relative; max-width: 860px; margin: 0 auto; padding-left: 2.2rem; }
.timeline::before { content:''; position: absolute; left: 8px; top: 8px; bottom: 8px; width: 3px;
    background: linear-gradient(180deg, var(--tibetan-red), var(--tibetan-yellow)); border-radius: 3px; }
.tl-item { position: relative; padding: 0 0 2.4rem 1.6rem; }
.tl-item::before { content:''; position: absolute; left: -2.2rem; top: .3rem; width: 15px; height: 15px;
    border-radius: 50%; background: #fff; border: 4px solid var(--tibetan-red); box-shadow: 0 0 0 4px rgba(30,91,184,.18); }
.tl-item .tl-year { display: inline-block; background: var(--tibetan-blue); color: var(--tibetan-yellow);
    padding: .2rem 1rem; border-radius: 20px; font-size: .85rem; margin-bottom: .6rem; font-weight: 700; }
.tl-item h4 { color: var(--tibetan-blue); font-size: 1.15rem; margin-bottom: .4rem; }
.tl-item p { color: #666; font-size: .95rem; line-height: 1.8; }

/* ---------- 价格表 ---------- */
.pricing { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px,1fr)); gap: 1.6rem; align-items: stretch; }
.price-card { background: #fff; border-radius: 22px; padding: 2.4rem 2rem; box-shadow: var(--shadow-soft);
    text-align: center; position: relative; transition: all .4s ease; border: 2px solid transparent; }
.price-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); }
.price-card.hot { border-color: var(--tibetan-yellow); }
.price-card .price-flag { position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
    background: var(--tibetan-red); color: #fff; font-size: .78rem; padding: .25rem 1rem; border-radius: 20px; letter-spacing: 1px; }
.price-card h4 { color: var(--tibetan-blue); font-size: 1.2rem; margin-bottom: 1rem; }
.price-card .price { font-size: 2.6rem; font-weight: 800; color: var(--tibetan-red); line-height: 1; }
.price-card .price small { font-size: .95rem; color: #999; font-weight: 400; }
.price-card ul { text-align: left; margin: 1.4rem 0 1.6rem; }
.price-card ul li { padding: .5rem 0 .5rem 1.6rem; position: relative; color: #555; font-size: .93rem; }
.price-card ul li::before { content: '✓'; position: absolute; left: 0; color: var(--tibetan-red); font-weight: 700; }
.price-card ul li.no::before { content: '✕'; color: #ccc; }
.price-card .desc { color: #666; font-size: .9rem; line-height: 1.7; margin-bottom: 1.2rem; }

/* ---------- 对比表 ---------- */
.compare-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 18px; overflow: hidden;
    box-shadow: var(--shadow-soft); }
.compare-table th, .compare-table td { padding: 1.1rem 1.3rem; text-align: center; font-size: .95rem; }
.compare-table thead th { background: var(--gradient-primary); color: #fff; font-size: 1rem; }
.compare-table thead th:first-child { background: var(--dark-brown); }
.compare-table td:first-child { text-align: left; color: var(--tibetan-blue); font-weight: 600; }
.compare-table tbody tr:nth-child(even) { background: #F1F5F9; }
.compare-table tbody tr:hover { background: #E2E8F0; }
.compare-table .yes { color: var(--tibetan-red); font-weight: 800; }
.compare-table .no { color: #ccc; }
/* Div-based comparison table (ct-row) */
.compare-table .ct-row { display: grid; grid-template-columns: 1.2fr 1fr 1fr; padding: 1.1rem 1.3rem; font-size: .95rem; text-align: center; border-bottom: 1px solid #E2E8F0; align-items: center; }
.compare-table .ct-row > div:first-child { text-align: left; color: var(--tibetan-blue); font-weight: 600; }
.compare-table .ct-row:nth-child(even) { background: #F1F5F9; }
.compare-table .ct-row:hover { background: #E2E8F0; }
.compare-table .ct-head { background: var(--gradient-primary); color: #fff; font-size: 1rem; font-weight: 600; border-bottom: none; }
.compare-table .ct-head > div:first-child { color: #fff; }
.compare-table .ct-row:last-child { border-bottom: none; }

/* ---------- FAQ 手风琴 ---------- */
.faq { max-width: 860px; margin: 0 auto; }
.faq details { background: #fff; border-radius: 16px; margin-bottom: 1rem; box-shadow: var(--shadow-soft);
    border: 1px solid #E2E8F0; overflow: hidden; transition: all .3s ease; }
.faq details[open] { box-shadow: var(--shadow-hover); }
.faq summary { padding: 1.3rem 1.6rem; cursor: pointer; font-weight: 600; color: var(--tibetan-blue);
    font-size: 1.02rem; list-style: none; display: flex; align-items: center; gap: .8rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: '+'; width: 30px; height: 30px; border-radius: 50%; flex-shrink: 0;
    background: rgba(30,91,184,.1); color: var(--tibetan-red); font-size: 1.2rem; display: flex;
    align-items: center; justify-content: center; transition: all .3s ease; }
.faq details[open] summary::before { transform: rotate(45deg); background: var(--tibetan-red); color: #fff; }
.faq .faq-a { padding: 0 1.6rem 1.4rem 4.4rem; color: #555; line-height: 1.9; font-size: .95rem; }

/* ---------- 客户评价 ---------- */
.testimonials { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px,1fr)); gap: 1.6rem; }
.testi { background: #fff; border-radius: 20px; padding: 2rem; box-shadow: var(--shadow-soft); position: relative; }
.testi::before { content: '“'; position: absolute; top: .4rem; left: 1.4rem; font-size: 4rem; color: rgba(30,91,184,.14); font-family: Georgia, serif; line-height: 1; }
.testi .stars { color: var(--tibetan-yellow); letter-spacing: 2px; margin-bottom: .9rem; }
.testi p { color: #555; line-height: 1.9; font-size: .95rem; margin-bottom: 1.2rem; }
.testi .who { display: flex; align-items: center; gap: .8rem; }
.testi .avatar { width: 46px; height: 46px; border-radius: 50%; background: var(--gradient-primary);
    color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; }
.testi .who b { color: var(--tibetan-blue); display: block; font-size: .95rem; }
.testi .who span { color: #999; font-size: .82rem; }

/* ---------- 案例卡 ---------- */
.case-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px,1fr)); gap: 1.8rem; }
.case-card { background: #fff; border-radius: 20px; overflow: hidden; box-shadow: var(--shadow-soft); transition: all .4s ease; }
.case-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); }
.case-card .cc-img { height: 210px; overflow: hidden; position: relative; }
.case-card .cc-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.case-card:hover .cc-img img { transform: scale(1.06); }
.case-card .cc-img .cc-tag { position: absolute; top: 14px; left: 14px; background: rgba(11,30,59,.92); color: var(--tibetan-yellow);
    font-size: .78rem; padding: .3rem .9rem; border-radius: 20px; }
.case-card .cc-body { padding: 1.6rem 1.6rem 1.8rem; }
.case-card .cc-body h4 { color: var(--tibetan-blue); font-size: 1.15rem; margin-bottom: .6rem; }
.case-card .cc-body p { color: #666; font-size: .92rem; line-height: 1.75; margin-bottom: 1rem; }
.case-card .cc-metrics { display: flex; gap: 1.6rem; padding-top: 1rem; border-top: 1px dashed #CBD5E1; }
.case-card .cc-metrics b { color: var(--tibetan-red); font-size: 1.35rem; display: block; }
.case-card .cc-metrics span { color: #999; font-size: .8rem; }

/* ---------- CTA 横幅 ---------- */
.cta-band { background: var(--gradient-primary); border-radius: 26px; padding: 3.5rem 3rem; text-align: center;
    color: #fff; position: relative; overflow: hidden; }
.cta-band::before { content:''; position:absolute; top:-60%; right:-10%; width:60%; height:220%;
    background: radial-gradient(circle, rgba(56,189,248,.25), transparent 60%); }
.cta-band h3 { font-size: 2rem; margin-bottom: .8rem; position: relative; z-index: 1; }
.cta-band p { max-width: 640px; margin: 0 auto 1.8rem; opacity: .92; position: relative; z-index: 1; line-height: 1.9; }
.cta-band .btn { position: relative; z-index: 1; }
.cta-band.gold { background: linear-gradient(135deg, #1E5BB8, #38BDF8); color: #fff; }
.cta-band.gold::before { background: radial-gradient(circle, rgba(11,30,59,.2), transparent 60%); }

/* ---------- 引用块 ---------- */
.quote { border-left: 5px solid var(--tibetan-yellow); background: #fff; border-radius: 0 18px 18px 0;
    padding: 1.8rem 2rem; box-shadow: var(--shadow-soft); max-width: 820px; margin: 2rem auto; }
.quote p { font-size: 1.15rem; color: var(--tibetan-blue); line-height: 1.9; font-style: italic; }
.quote .q-who { margin-top: .8rem; color: #999; font-size: .9rem; }

/* ---------- 轮播相册 / 画廊 ---------- */
.gallery { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px,1fr)); gap: 1.2rem; }
.gallery .g-item { border-radius: 16px; overflow: hidden; position: relative; height: 200px; }
.gallery .g-item img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.gallery .g-item:hover img { transform: scale(1.08); }
.gallery .g-item .g-cap { position: absolute; left: 0; right: 0; bottom: 0; padding: 2rem .9rem .8rem;
    background: linear-gradient(transparent, rgba(11,30,59,.88)); color: #fff; font-size: .85rem; }

/* ---------- 徽章标签 ---------- */
.tag-row { display: flex; flex-wrap: wrap; gap: .7rem; justify-content: center; }
.tag { background: #fff; border: 1px solid #E2E8F0; color: var(--tibetan-blue); padding: .55rem 1.2rem;
    border-radius: 30px; font-size: .9rem; transition: all .3s ease; }
.tag:hover { background: var(--tibetan-blue); color: #fff; border-color: var(--tibetan-blue); }

/* ---------- 步骤说明大图（含图片步骤） ---------- */
.process-panels { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px,1fr)); gap: 1.4rem; }
.ppanel { background: #fff; border-radius: 18px; padding: 1.8rem; box-shadow: var(--shadow-soft);
    border-top: 4px solid var(--tibetan-yellow); transition: all .3s ease; }
.ppanel:hover { transform: translateY(-5px); }
.ppanel .p-icon { font-size: 1.9rem; margin-bottom: .8rem; }
.ppanel h4 { color: var(--tibetan-blue); font-size: 1.1rem; margin-bottom: .5rem; }
.ppanel p { color: #666; font-size: .9rem; line-height: 1.75; }

/* ---------- 链接卡片网格 ---------- */
.panels { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px,1fr)); gap: 1.6rem; }
.panel { display: block; background: #fff; border-radius: 18px; padding: 2rem 1.8rem; box-shadow: var(--shadow-soft);
    border-left: 4px solid var(--tibetan-yellow); transition: all .3s ease; }
.panel:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); border-left-color: var(--tibetan-red); }
.panel h4 { color: var(--tibetan-blue); font-size: 1.15rem; margin-bottom: .6rem; }
.panel p { color: #666; font-size: .92rem; line-height: 1.75; }
.panel:hover h4 { color: var(--tibetan-red); }

/* ---------- 联系方式信息条 ---------- */
.contact-strip { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px,1fr)); gap: 1.4rem; }
.c-strip { background: #fff; border-radius: 18px; padding: 1.6rem; display: flex; align-items: center; gap: 1.1rem;
    box-shadow: var(--shadow-soft); }
.c-strip .ci { width: 56px; height: 56px; border-radius: 16px; background: linear-gradient(135deg, rgba(30,91,184,.1), rgba(56,189,248,.2));
    display: flex; align-items: center; justify-content: center; font-size: 1.5rem; flex-shrink: 0; }
.c-strip b { display: block; color: var(--tibetan-blue); font-size: 1rem; }
.c-strip span { color: #777; font-size: .88rem; }

/* ---------- 列表两列 ---------- */
.cols2 { column-count: 2; column-gap: 2.5rem; }
.cols2 li { padding: .5rem 0; color: #555; position: relative; padding-left: 1.6rem; break-inside: avoid; }
.cols2 li::before { content: '◆'; position: absolute; left: 0; color: var(--tibetan-yellow); font-size: .8rem; top: .65rem; }

/* ---------- 大图横幅文字 ---------- */
.full-img { position: relative; min-height: 380px; display: flex; align-items: center; background-size: cover; background-position: center; }
.full-img::before { content:''; position:absolute; inset:0; background: linear-gradient(90deg, rgba(11,30,59,.92), rgba(30,91,184,.65)); }
.full-img .container { position: relative; z-index: 1; color: #fff; }
.full-img h3 { font-size: 2.1rem; margin-bottom: 1rem; }
.full-img p { max-width: 640px; line-height: 1.9; margin-bottom: 1.4rem; opacity: .95; }

/* ---------- 底部回到顶部 ---------- */
.back-top { position: fixed; right: 26px; bottom: 30px; width: 48px; height: 48px; border-radius: 50%;
    background: var(--gradient-primary); color: var(--tibetan-yellow); border: none; cursor: pointer;
    font-size: 1.3rem; box-shadow: var(--shadow-soft); opacity: 0; visibility: hidden; transition: all .4s ease; z-index: 900; }
.back-top.show { opacity: 1; visibility: visible; }
.back-top:hover { transform: translateY(-4px); }

/* ---------- 数字小标 ---------- */
.mini-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px,1fr)); gap: 1.2rem; }
.mini-stat { background: #fff; border-radius: 16px; padding: 1.4rem; text-align: center; box-shadow: var(--shadow-soft); }
.mini-stat b { font-size: 1.9rem; color: var(--tibetan-red); display: block; line-height: 1.2; }
.mini-stat span { color: #888; font-size: .88rem; }

/* ---------- 表单 ---------- */
.contact-form { max-width: 800px; margin: 2.5rem auto 0; background: #fff; padding: 2.8rem;
    border-radius: 25px; box-shadow: var(--shadow-soft); }
.form-group { margin-bottom: 1.5rem; }
.form-group label { display: block; margin-bottom: .5rem; color: var(--tibetan-blue); font-weight: 600; }
.form-control { width: 100%; padding: .85rem 1.2rem; border: 2px solid #E2E8F0; border-radius: 12px;
    font-size: 1rem; transition: all .3s ease; font-family: inherit; background: #fff; }
.form-control:focus { outline: none; border-color: var(--tibetan-blue); box-shadow: 0 0 0 3px rgba(56,189,248,.18); }
textarea.form-control { min-height: 150px; resize: vertical; }

/* ========================================
   分组下拉导航（mega menu）
   ======================================== */
.nav-item { position: relative; }
.nav-item > .nav-link { display: flex; align-items: center; gap: .35rem; }
.nav-item > .nav-link .caret { font-size: .7rem; opacity: .8; transition: transform .3s ease; }
.nav-item:hover > .nav-link .caret { transform: rotate(180deg); }

.dropdown-menu {
    position: absolute; top: calc(100% + 14px); left: 50%; transform: translateX(-50%) translateY(10px);
    background: #fff; border-radius: 16px; box-shadow: 0 22px 55px rgba(11,30,59,.25);
    padding: 1.2rem 1rem; min-width: 220px; opacity: 0; visibility: hidden; transition: all .3s ease;
    border-top: 4px solid var(--tibetan-yellow); z-index: 999;
}
.nav-item:hover .dropdown-menu, .nav-item:focus-within .dropdown-menu {
    opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0);
}
.dropdown-menu a { display: block; padding: .6rem 1rem; color: #444; border-radius: 10px; font-size: .92rem; white-space: nowrap; }
.dropdown-menu a:hover { background: rgba(30,91,184,.08); color: var(--tibetan-red); padding-left: 1.4rem; }

/* 多栏大菜单 */
.dropdown-menu.mega { width: 680px; max-width: 86vw; display: grid; grid-template-columns: repeat(3, 1fr); gap: .4rem 1rem; }
.dropdown-menu.mega .mega-title { grid-column: 1 / -1; font-size: .8rem; color: #94A3B8; letter-spacing: 2px;
    padding: .2rem 1rem .4rem; border-bottom: 1px solid #E2E8F0; margin-bottom: .4rem; font-weight: 600; }
.dropdown-menu.mega a { white-space: normal; line-height: 1.45; }
.dropdown-menu.mega.mega-4 { grid-template-columns: repeat(4, 1fr); }

/* 移动端菜单里的下拉 */
@media (max-width: 768px) {
    .nav-item { width: 100%; }
    .dropdown-menu, .dropdown-menu.mega { position: static; transform: none; opacity: 1; visibility: visible;
        box-shadow: none; background: rgba(255,255,255,.08); border-radius: 10px; border-top: none;
        display: none; padding: .4rem .6rem; width: 100%; max-width: none; margin: .3rem 0; grid-template-columns: 1fr; }
    .nav-item.open .dropdown-menu { display: block; }
    .dropdown-menu a { color: rgba(255,255,255,.9); }
    .dropdown-menu a:hover { background: rgba(255,255,255,.1); color: var(--tibetan-yellow); }
    .dropdown-menu.mega .mega-title { color: rgba(255,255,255,.5); border-bottom-color: rgba(255,255,255,.15); }
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
    .banner h1 { font-size: 2.2rem; }
    .banner-split { grid-template-columns: 1fr; padding-top: 7.5rem; }
    .banner-split .banner-img { order: -1; }
    .banner-split .banner-img img { height: 260px; }
    .split { grid-template-columns: 1fr; gap: 2rem; }
    .split-img img { height: 280px; }
    .split-reverse .split-img { order: 0; }
    .stats-band .stat + .stat::before { display: none; }
    .cols2 { column-count: 1; }
    .section { padding: 3.5rem 0; }
    .section-head h2 { font-size: 1.8rem; }
    .steps .step::after { display: none; }
    .compare-table { display: block; overflow-x: auto; white-space: nowrap; }
}