:root {
    --c-primary: #2563eb;
    --c-primary-d: #1d4ed8;
    --c-accent: #0ea5e9;
    --c-dark: #0f172a;
    --c-text: #1f2937;
    --c-muted: #64748b;
    --c-bg: #ffffff;
    --c-bg-soft: #f8fafc;
    --c-border: #e5e7eb;
    --radius: 14px;
    --shadow: 0 10px 30px rgba(15, 23, 42, .08);
    --maxw: 1180px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--c-text);
    background: var(--c-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ===== 顶部导航 ===== */
.site-header {
    position: sticky; top: 0; z-index: 50;
    background: rgba(255, 255, 255, .9);
    backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--c-border);
}
.nav-wrap { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-logo { height: 40px; width: auto; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text strong { font-size: 18px; color: var(--c-dark); }
.brand-text em { font-style: normal; font-size: 11px; letter-spacing: 2px; color: var(--c-muted); }
.site-nav { display: flex; align-items: center; gap: 26px; }
.site-nav a { color: var(--c-text); font-size: 15px; font-weight: 500; transition: color .2s; }
.site-nav a:hover, .site-nav a.active { color: var(--c-primary); }
.nav-toggle { display: none; background: none; border: 0; font-size: 24px; cursor: pointer; color: var(--c-dark); }

/* ===== 按钮 ===== */
.btn {
    display: inline-block; padding: 12px 26px; border-radius: 999px;
    font-weight: 600; font-size: 15px; cursor: pointer; border: 1px solid transparent;
    transition: transform .15s, box-shadow .2s, background .2s;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--c-primary); color: #fff; box-shadow: 0 8px 20px rgba(37, 99, 235, .3); }
.btn-ghost { background: #fff; color: var(--c-primary); border-color: var(--c-primary); }
.btn-nav { padding: 9px 20px; background: var(--c-primary); color: #fff !important; }
.btn-dark { background: var(--c-dark); color: #fff; }

/* ===== Hero ===== */
.hero {
    position: relative; padding: 96px 0 110px;
    background: radial-gradient(1200px 500px at 80% -10%, rgba(14,165,233,.18), transparent),
                linear-gradient(135deg, #0f172a 0%, #1e3a8a 60%, #2563eb 100%);
    color: #fff; overflow: hidden;
}
.hero::after {
    content: ""; position: absolute; inset: 0;
    background-image: radial-gradient(rgba(255,255,255,.08) 1px, transparent 1px);
    background-size: 26px 26px; opacity: .5;
}
.hero .container { position: relative; z-index: 1; }
.hero h1 { font-size: clamp(30px, 5vw, 52px); margin: 0 0 18px; line-height: 1.2; font-weight: 800; }
.hero p.lead { font-size: clamp(16px, 2vw, 20px); color: #dbeafe; max-width: 640px; margin: 0 0 32px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero .btn-ghost { color: #fff; border-color: rgba(255,255,255,.6); background: transparent; }
.hero .btn-ghost:hover { background: rgba(255,255,255,.12); border-color: #fff; }

/* ===== 通用区块 ===== */
section { padding: 76px 0; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 48px; }
.section-head .eyebrow { color: var(--c-primary); font-weight: 700; letter-spacing: 2px; font-size: 13px; text-transform: uppercase; }
.section-head h2 { font-size: clamp(26px, 3.4vw, 38px); margin: 10px 0 12px; color: var(--c-dark); }
.section-head p { color: var(--c-muted); font-size: 16px; margin: 0; }
.bg-soft { background: var(--c-bg-soft); }

/* ===== 数据条 ===== */
.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.metric { background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius); padding: 26px; text-align: center; }
.metric .num { font-size: 34px; font-weight: 800; color: var(--c-primary); }
.metric .lbl { color: var(--c-muted); margin-top: 6px; }

/* ===== 卡片网格 ===== */
.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card {
    background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius);
    padding: 28px; transition: transform .2s, box-shadow .2s, border-color .2s;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: #c7d2fe; }
.card .icon { font-size: 30px; width: 56px; height: 56px; display: grid; place-items: center;
    background: linear-gradient(135deg, #eff6ff, #dbeafe); border-radius: 14px; margin-bottom: 16px; }
.card h3 { margin: 0 0 10px; font-size: 19px; color: var(--c-dark); }
.card p { color: var(--c-muted); margin: 0; font-size: 15px; }
.card .more { display: inline-block; margin-top: 16px; color: var(--c-primary); font-weight: 600; }

/* ===== 案例 / 新闻列表 ===== */
.post { display: flex; flex-direction: column; background: #fff; border: 1px solid var(--c-border);
    border-radius: var(--radius); overflow: hidden; transition: transform .2s, box-shadow .2s; }
.post:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.post .thumb { aspect-ratio: 16/9; background: linear-gradient(135deg, #1e3a8a, #0ea5e9); display: grid; place-items: center; color: #fff; font-size: 22px; font-weight: 700; }
.post .thumb img { width: 100%; height: 100%; object-fit: cover; }
.post .body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.post .tag { font-size: 12px; color: var(--c-primary); font-weight: 700; }
.post h3 { margin: 8px 0; font-size: 18px; color: var(--c-dark); }
.post p { color: var(--c-muted); font-size: 14px; margin: 0 0 14px; flex: 1; }
.post .meta { font-size: 13px; color: var(--c-muted); }

/* ===== CTA ===== */
.cta { background: linear-gradient(135deg, #1e3a8a, #2563eb); color: #fff; border-radius: 20px; padding: 54px; text-align: center; }
.cta h2 { margin: 0 0 12px; font-size: clamp(24px, 3vw, 34px); }
.cta p { color: #dbeafe; margin: 0 0 26px; }

/* ===== 联系表单 ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.info-card { background: var(--c-bg-soft); border: 1px solid var(--c-border); border-radius: var(--radius); padding: 28px; }
.info-card .row { display: flex; gap: 12px; margin-bottom: 18px; }
.info-card .row .k { color: var(--c-primary); font-weight: 700; min-width: 64px; }
.form-field { margin-bottom: 16px; }
.form-field label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; color: var(--c-dark); }
.form-field input, .form-field textarea, .form-field select {
    width: 100%; padding: 12px 14px; border: 1px solid var(--c-border); border-radius: 10px;
    font-size: 15px; font-family: inherit; background: #fff; color: var(--c-text);
}
.form-field input:focus, .form-field textarea:focus { outline: none; border-color: var(--c-primary); box-shadow: 0 0 0 3px rgba(37,99,235,.12); }
.form-field textarea { min-height: 130px; resize: vertical; }

/* ===== 详情页 ===== */
.page-hero { background: linear-gradient(135deg, #0f172a, #1e3a8a); color: #fff; padding: 64px 0; }
.page-hero h1 { margin: 0; font-size: clamp(26px, 3.4vw, 40px); }
.page-hero p { color: #cbd5e1; margin: 10px 0 0; }
.article { max-width: 820px; margin: 0 auto; }
.article img { border-radius: var(--radius); margin: 20px 0; }
.article p, .article li { font-size: 16px; color: #374151; }
.article h2, .article h3 { color: var(--c-dark); margin-top: 32px; }
.breadcrumb { font-size: 14px; color: #cbd5e1; margin-bottom: 8px; }
.breadcrumb a { color: #93c5fd; }

.notice { padding: 14px 18px; border-radius: 10px; margin-bottom: 18px; font-size: 15px; }
.notice-ok { background: #ecfdf5; color: #047857; border: 1px solid #a7f3d0; }
.notice-err { background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; }

/* ===== 页脚 ===== */
.site-footer { background: var(--c-dark); color: #cbd5e1; padding: 54px 0 24px; margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1.4fr; gap: 30px; }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.footer-brand img { height: 36px; }
.footer-brand strong { color: #fff; font-size: 18px; }
.footer-desc { color: #94a3b8; font-size: 14px; max-width: 360px; }
.footer-intro { color: #cbd5e1; font-size: 13px; line-height: 1.7; max-width: 380px; margin-top: 10px; }
.footer-intro strong { color: #e2e8f0; font-weight: 600; }
.footer-col h4 { color: #fff; margin: 0 0 14px; font-size: 15px; }
.footer-col a, .footer-col p { display: block; color: #94a3b8; font-size: 14px; margin: 0 0 8px; }
.footer-col a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid #1e293b; margin-top: 30px; padding-top: 18px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; font-size: 13px; color: #64748b; }

/* ===== 响应式 ===== */
@media (max-width: 900px) {
    .grid-3, .grid-2, .metrics { grid-template-columns: 1fr 1fr; }
    .contact-grid, .footer-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
    .nav-toggle { display: block; }
    .site-nav { position: absolute; top: 68px; left: 0; right: 0; background: #fff; flex-direction: column;
        align-items: stretch; gap: 0; padding: 8px 20px 16px; border-bottom: 1px solid var(--c-border);
        display: none; box-shadow: var(--shadow); }
    .site-nav.open { display: flex; }
    .site-nav a { padding: 12px 0; border-bottom: 1px solid var(--c-bg-soft); }
    .metrics, .grid-3, .grid-2 { grid-template-columns: 1fr; }
    section { padding: 52px 0; }
    .cta { padding: 36px 22px; }
}

/* ===== 服务面板（三列分组风格） ===== */
.svc-panel-section { padding: 60px 0 48px; }

/* ===== 会议系统开发 全流程卡片（一步一卡，不重复） ===== */
.meeting-flow { display: flex; flex-direction: column; gap: 20px; margin-top: 8px; }
.mf-card {
    display: flex; align-items: stretch; gap: 0;
    background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius);
    box-shadow: var(--shadow); overflow: hidden;
    transition: transform .2s, box-shadow .2s;
}
.mf-card:hover { transform: translateY(-3px); box-shadow: 0 12px 32px rgba(37,99,235,.12); border-color: #c7d2fe; }
.mf-step {
    width: 56px; min-height: 100px; flex-shrink: 0;
    display: grid; place-items: center;
    font-size: 22px; font-weight: 800; color: #fff;
    background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
}
.mf-body {
    flex: 1; padding: 20px 24px; display: flex; align-items: center; gap: 18px;
}
.mf-icon {
    width: 52px; height: 52px; flex-shrink: 0;
    display: grid; place-items: center; font-size: 26px;
    background: #eff6ff; border-radius: 12px;
}
.mf-body h3 { margin: 0; font-size: 18px; color: var(--c-dark); white-space: nowrap; }
.mf-summary { margin: 0; font-size: 14px; color: var(--c-muted); white-space: nowrap; }
.mf-detail { margin: 4px 0 0; font-size: 13px; color: #64748b; line-height: 1.5; }

@media (max-width: 768px) {
    .mf-card { flex-direction: column; }
    .mf-step { width: 100%; min-height: 40px; font-size: 16px; }
    .mf-body { flex-direction: column; align-items: flex-start; gap: 10px; padding: 16px 18px; }
    .mf-body h3, .mf-summary { white-space: normal; }
}
.svc-panel {
    background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius);
    box-shadow: var(--shadow); padding: 40px 36px 32px;
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px;
}
.svc-col { display: flex; flex-direction: column; }
.svc-col-head {
    display: flex; align-items: center; gap: 8px;
    margin-bottom: 18px; padding-bottom: 14px;
    border-bottom: 1px solid var(--c-border);
}
.svc-col-icon { font-size: 20px; width: 34px; height: 34px; display: grid; place-items: center;
    background: linear-gradient(135deg, #eff6ff, #dbeafe); border-radius: 8px; flex-shrink: 0; }
.svc-col-title { font-size: 17px; font-weight: 700; color: var(--c-dark); white-space: nowrap; }
.svc-list { list-style: none; padding: 0; margin: 0; flex: 1; }
.svc-list li {
    display: flex; align-items: center; gap: 10px;
    padding: 9px 0; cursor: pointer; transition: color .15s;
    border-radius: 6px; margin: 0 -4px;
}
.svc-list li:hover { background: var(--c-bg-soft); }
.svc-list li:hover .svc-item-text { color: var(--c-primary); }
.svc-item-icon {
    font-size: 16px; width: 30px; height: 30px; display: grid; place-items: center;
    background: #f1f5f9; border-radius: 7px; flex-shrink: 0; font-size: 13px;
}
.svc-item-text { font-size: 14.5px; color: var(--c-text); transition: color .15s; }
.svc-col-more {
    display: inline-block; margin-top: 14px; padding-top: 12px;
    border-top: 1px dashed var(--c-border);
    font-size: 13.5px; color: var(--c-primary); font-weight: 600;
}
.svc-panel-footer { text-align: center; margin-top: 24px; }
.svc-all-link {
    display: inline-block; font-size: 15px; color: var(--c-primary);
    font-weight: 600; padding: 10px 28px; border-radius: 999px;
    border: 1px solid var(--c-border); transition: all .2s;
}
.svc-all-link:hover { background: var(--c-primary); color: #fff; border-color: var(--c-primary); }

@media (max-width: 900px) {
    .svc-panel { grid-template-columns: repeat(2, 1fr); gap: 22px; padding: 28px 22px 22px; }
}
@media (max-width: 640px) {
    .svc-panel { grid-template-columns: 1fr; gap: 18px; padding: 22px 16px 18px; }
    .svc-panel-section { padding: 40px 0 32px; }
}

/* ===== 商会黄页 介绍页（复用通用卡片样式，无需额外类） ===== */
.hy-hero-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 26px; }
.hy-ref { margin-top: 30px; font-size: 13px; color: #94a3b8; text-align: center; }
.hy-ref a { color: var(--c-muted); }
.hy-callout { background: #fff; border: 1px solid var(--c-border); border-left: 4px solid var(--c-primary);
    border-radius: 12px; padding: 22px 24px; }
.hy-callout h3 { margin: 0 0 8px; color: var(--c-dark); font-size: 18px; }
.hy-callout p { margin: 0; color: var(--c-muted); font-size: 15px; }

/* ===== FAQ（GEO 友好，原生 details 手风琴） ===== */
.faq { max-width: 880px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq-item { background: #fff; border: 1px solid var(--c-border); border-radius: 12px; overflow: hidden; transition: border-color .2s, box-shadow .2s; }
.faq-item[open] { border-color: var(--c-primary); box-shadow: 0 8px 24px rgba(15,23,42,.06); }
.faq-item summary { cursor: pointer; list-style: none; padding: 18px 54px 18px 22px; position: relative; font-weight: 700; color: var(--c-dark); font-size: 16px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; position: absolute; right: 22px; top: 50%; transform: translateY(-50%); font-size: 22px; color: var(--c-primary); font-weight: 400; transition: transform .2s; }
.faq-item[open] summary::after { content: "\2212"; }
.faq-a { padding: 0 22px 20px; color: var(--c-muted); font-size: 15px; line-height: 1.8; }