/* ==========================================================================
   数智商会通 · 官方网站样式
   品牌色取自 brand/shanghuitong-logo-transparent.png 实际像素：
     青蓝 #15abb8 / #28b6d8 / #08acb3  字标 #313232
   与仓库 UI 规范「科技商务风」主色 #2193b0 / #36B1AC 一致。
   纯 CSS，无构建步骤；所有文字内容在 HTML 中服务端直出（禁用 JS 亦可读）。
   ========================================================================== */

:root {
    --brand: #0f9fb0;
    --brand-2: #36b1ac;
    --brand-deep: #0b7d8c;
    --brand-ink: #075e69;
    --mint: #95d6d3;
    --mint-soft: #e8f6f6;
    --gold: #d9bc64;

    --ink: #1f2430;
    --text: #393d4e;
    --muted: #758583;

    --bg: #ffffff;
    --bg-soft: #f5fafb;
    --line: rgba(15, 159, 176, 0.14);
    --line-strong: rgba(15, 159, 176, 0.28);
    --shadow: 0 10px 30px rgba(12, 62, 72, 0.08);
    --shadow-lg: 0 20px 60px rgba(12, 62, 72, 0.13);

    --radius: 16px;
    --radius-lg: 22px;
    --wrap: 1180px;
    --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
}

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

html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    color: var(--text);
    background: var(--bg);
    line-height: 1.75;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--brand-deep);
    text-decoration: none;
}

a:hover {
    color: var(--brand);
}

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

.wrap {
    width: 100%;
    max-width: var(--wrap);
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------------------------------------------------------------- 顶部导航 */

.nav {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: saturate(180%) blur(14px);
    border-bottom: 1px solid var(--line);
}

.nav-inner {
    display: flex;
    align-items: center;
    gap: 28px;
    height: 72px;
    max-width: var(--wrap);
    margin: 0 auto;
    padding: 0 24px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 0 0 auto;
}

.brand img {
    width: auto;
    height: 42px;
}

.brand-text b {
    display: block;
    font-size: 19px;
    letter-spacing: 1px;
    color: var(--ink);
    line-height: 1.25;
}

.brand-text i {
    display: block;
    font-style: normal;
    font-size: 11px;
    letter-spacing: 2px;
    color: var(--brand);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: auto;
}

.nav-links a {
    padding: 8px 14px;
    border-radius: 10px;
    color: var(--text);
    font-size: 15px;
    transition: background 0.18s, color 0.18s;
}

.nav-links a:hover {
    background: var(--mint-soft);
    color: var(--brand-ink);
}

.nav-cta {
    flex: 0 0 auto;
    padding: 10px 22px;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--brand), var(--brand-2));
    color: #fff !important;
    font-size: 15px;
    font-weight: 600;
    box-shadow: 0 6px 18px rgba(15, 159, 176, 0.28);
    transition: transform 0.18s, box-shadow 0.18s;
}

.nav-cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 24px rgba(15, 159, 176, 0.36);
}

/* -------------------------------------------------------------------- 首屏 */

.hero {
    position: relative;
    overflow: hidden;
    padding: 92px 0 86px;
    background:
        radial-gradient(1000px 460px at 78% -8%, rgba(54, 177, 172, 0.16), transparent 62%),
        radial-gradient(760px 380px at 8% 6%, rgba(149, 214, 211, 0.24), transparent 60%),
        linear-gradient(180deg, #f7fcfc 0%, #ffffff 100%);
    border-bottom: 1px solid var(--line);
}

.hero-rings {
    position: absolute;
    top: -180px;
    right: -140px;
    width: 760px;
    height: 760px;
    pointer-events: none;
    background: repeating-radial-gradient(circle at 50% 50%,
            rgba(15, 159, 176, 0) 0 46px,
            rgba(15, 159, 176, 0.1) 46px 47px,
            rgba(15, 159, 176, 0) 47px 92px);
    mask-image: radial-gradient(circle at 50% 50%, #000 34%, transparent 72%);
    -webkit-mask-image: radial-gradient(circle at 50% 50%, #000 34%, transparent 72%);
}

.hero-inner {
    position: relative;
    z-index: 1;
    max-width: var(--wrap);
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1.08fr 0.92fr;
    gap: 56px;
    align-items: center;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 16px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid var(--line-strong);
    color: var(--brand-ink);
    font-size: 13px;
    letter-spacing: 0.5px;
}

.eyebrow::before {
    content: "";
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--brand), var(--brand-2));
}

.hero h1 {
    margin: 22px 0 0;
    font-size: 52px;
    line-height: 1.18;
    letter-spacing: 1px;
    color: var(--ink);
    font-weight: 700;
}

.hero h1 em {
    font-style: normal;
    background: linear-gradient(120deg, var(--brand) 8%, var(--brand-2) 55%, var(--mint) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-sub {
    margin: 18px 0 0;
    font-size: 19px;
    color: var(--brand-ink);
    letter-spacing: 1.5px;
    font-weight: 500;
}

.hero-lead {
    margin: 20px 0 0;
    font-size: 16.5px;
    color: var(--text);
    max-width: 560px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-top: 34px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 30px;
    border-radius: 999px;
    font-size: 16px;
    font-weight: 600;
    transition: transform 0.18s, box-shadow 0.18s, background 0.18s;
}

.btn-primary {
    background: linear-gradient(135deg, var(--brand), var(--brand-2));
    color: #fff !important;
    box-shadow: 0 10px 26px rgba(15, 159, 176, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 34px rgba(15, 159, 176, 0.38);
}

.btn-ghost {
    background: #fff;
    color: var(--brand-ink) !important;
    border: 1px solid var(--line-strong);
}

.btn-ghost:hover {
    background: var(--mint-soft);
    transform: translateY(-2px);
}

.hero-trust {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 22px;
    margin-top: 30px;
    font-size: 13px;
    color: var(--muted);
}

.hero-trust span {
    display: inline-flex;
    align-items: center;
    gap: 7px;
}

.hero-trust span::before {
    content: "";
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background: var(--mint-soft);
    border: 1px solid var(--line-strong);
}

/* 首屏右侧：能力圈示意卡 */

.hero-art {
    position: relative;
    padding: 26px;
    border-radius: var(--radius-lg);
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow-lg);
}

.hero-art-head {
    display: flex;
    align-items: center;
    gap: 10px;
    padding-bottom: 16px;
    border-bottom: 1px dashed var(--line-strong);
}

.hero-art-head b {
    font-size: 15px;
    color: var(--ink);
}

.hero-art-head i {
    margin-left: auto;
    font-style: normal;
    font-size: 12px;
    color: var(--brand);
    background: var(--mint-soft);
    padding: 3px 10px;
    border-radius: 999px;
}

.hero-art ul {
    list-style: none;
    margin-top: 6px;
}

.hero-art li {
    display: flex;
    align-items: baseline;
    gap: 12px;
    padding: 13px 4px;
    border-bottom: 1px solid rgba(15, 159, 176, 0.08);
    font-size: 14.5px;
}

.hero-art li:last-child {
    border-bottom: 0;
}

.hero-art li b {
    flex: 0 0 68px;
    color: var(--brand-ink);
    font-size: 14.5px;
}

.hero-art li span {
    color: var(--muted);
    font-size: 13.5px;
}

/* -------------------------------------------------------------------- 区块 */

.section {
    padding: 82px 0;
}

.section-soft {
    background: var(--bg-soft);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.section-head {
    max-width: 760px;
    margin-bottom: 46px;
}

.section-head.center {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.section-eyebrow {
    display: inline-block;
    font-size: 12.5px;
    letter-spacing: 3px;
    color: var(--brand);
    font-weight: 600;
    text-transform: uppercase;
}

.section-head h2 {
    margin: 12px 0 0;
    font-size: 34px;
    line-height: 1.32;
    letter-spacing: 0.5px;
    color: var(--ink);
    font-weight: 700;
}

.section-head p {
    margin: 16px 0 0;
    font-size: 16px;
    color: var(--muted);
}

/* ------------------------------------------------------------------ 数据条 */

.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
}

.stat {
    padding: 28px 22px;
    border-radius: var(--radius);
    background: #fff;
    border: 1px solid var(--line);
    text-align: center;
    box-shadow: var(--shadow);
}

.stat b {
    display: block;
    font-size: 34px;
    line-height: 1.1;
    letter-spacing: 0.5px;
    background: linear-gradient(120deg, var(--brand), var(--brand-2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.stat span {
    display: block;
    margin-top: 8px;
    font-size: 14px;
    color: var(--muted);
}

/* ------------------------------------------------------------------ 卡片网格 */

.grid {
    display: grid;
    gap: 22px;
}

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

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

.card {
    position: relative;
    padding: 30px 26px;
    border-radius: var(--radius);
    background: #fff;
    border: 1px solid var(--line);
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--line-strong);
}

.card-icon {
    width: 46px;
    height: 46px;
    border-radius: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    background: linear-gradient(135deg, var(--brand), var(--brand-2));
    box-shadow: 0 8px 18px rgba(15, 159, 176, 0.24);
}

.card h3 {
    margin: 18px 0 0;
    font-size: 19px;
    color: var(--ink);
    letter-spacing: 0.5px;
}

.card .card-tag {
    display: inline-block;
    margin-top: 8px;
    font-size: 12.5px;
    letter-spacing: 1px;
    color: var(--brand);
}

.card p {
    margin: 12px 0 0;
    font-size: 14.5px;
    color: var(--muted);
}

.card .card-live {
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px dashed var(--line-strong);
    font-size: 13px;
    color: var(--brand-ink);
}

/* -------------------------------------------------------------- 图文交替行 */

.feature {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
}

.feature+.feature {
    margin-top: 72px;
}

.feature h3 {
    font-size: 27px;
    color: var(--ink);
    letter-spacing: 0.5px;
}

.feature .feature-tag {
    display: inline-block;
    margin-bottom: 12px;
    font-size: 12.5px;
    letter-spacing: 3px;
    color: var(--brand);
    font-weight: 600;
}

.feature p {
    margin-top: 16px;
    font-size: 15.5px;
    color: var(--text);
}

.feature ul {
    list-style: none;
    margin-top: 22px;
    display: grid;
    gap: 12px;
}

.feature li {
    position: relative;
    padding-left: 26px;
    font-size: 15px;
    color: var(--text);
}

.feature li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 9px;
    width: 14px;
    height: 14px;
    border-radius: 4px;
    background: linear-gradient(135deg, var(--mint), var(--brand));
}

.feature-panel {
    padding: 30px;
    border-radius: var(--radius-lg);
    background: linear-gradient(160deg, #f2fbfb 0%, #ffffff 60%);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.feature-panel .rows {
    display: grid;
    gap: 12px;
}

.feature-panel .row {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 15px 18px;
    border-radius: 12px;
    background: #fff;
    border: 1px solid var(--line);
    font-size: 14.5px;
}

.feature-panel .row b {
    color: var(--brand-ink);
    flex: 0 0 auto;
}

.feature-panel .row span {
    color: var(--muted);
    font-size: 13.5px;
    margin-left: auto;
}

/* ---------------------------------------------------------------- 资质合规 */

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

.cert {
    padding: 26px 24px;
    border-radius: var(--radius);
    background: #fff;
    border: 1px solid var(--line);
    border-left: 4px solid var(--brand);
    box-shadow: var(--shadow);
}

.cert b {
    display: block;
    font-size: 15.5px;
    color: var(--ink);
}

.cert span {
    display: block;
    margin-top: 8px;
    font-size: 13.5px;
    color: var(--muted);
    word-break: break-all;
}

.cert em {
    display: block;
    margin-top: 10px;
    font-style: normal;
    font-size: 12.5px;
    letter-spacing: 1px;
    color: var(--brand);
}

/* -------------------------------------------------------------------- CTA */

.cta {
    padding: 66px 0;
    background: linear-gradient(135deg, var(--brand-ink) 0%, var(--brand-deep) 46%, var(--brand) 100%);
    color: #fff;
    text-align: center;
}

.cta h2 {
    font-size: 32px;
    letter-spacing: 1px;
    color: #fff;
}

.cta p {
    margin: 16px auto 0;
    max-width: 620px;
    color: rgba(255, 255, 255, 0.86);
    font-size: 16px;
}

.cta .btn-white {
    margin-top: 30px;
    background: #fff;
    color: var(--brand-ink) !important;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
}

.cta .btn-white:hover {
    transform: translateY(-2px);
}

/* ---------------------------------------------------------------- 页脚 */

.footer {
    background: #0e2a30;
    color: rgba(255, 255, 255, 0.72);
    padding: 56px 0 0;
    font-size: 14px;
}

.footer-top {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
    gap: 40px;
    padding-bottom: 40px;
}

.footer h4 {
    font-size: 14px;
    color: #fff;
    letter-spacing: 1px;
    margin-bottom: 16px;
    font-weight: 600;
}

.footer ul {
    list-style: none;
    display: grid;
    gap: 11px;
}

.footer a {
    color: rgba(255, 255, 255, 0.72);
}

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

.footer-brand b {
    display: block;
    font-size: 19px;
    color: #fff;
    letter-spacing: 1px;
}

.footer-brand i {
    display: block;
    font-style: normal;
    font-size: 12px;
    letter-spacing: 2px;
    color: var(--mint);
    margin-top: 4px;
}

.footer-brand p {
    margin-top: 16px;
    line-height: 1.85;
    color: rgba(255, 255, 255, 0.62);
    font-size: 13.5px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    padding: 22px 0 30px;
    display: grid;
    gap: 10px;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
}

.footer-bottom .legal {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 20px;
    align-items: center;
}

.footer-bottom .legal a {
    color: rgba(255, 255, 255, 0.78);
}

/* -------------------------------------------------------------- 内页页头 */

.page-head {
    padding: 64px 0 52px;
    background:
        radial-gradient(760px 320px at 82% -20%, rgba(54, 177, 172, 0.16), transparent 62%),
        linear-gradient(180deg, #f5fbfb 0%, #ffffff 100%);
    border-bottom: 1px solid var(--line);
}

.page-head .crumb {
    font-size: 13px;
    color: var(--muted);
    margin-bottom: 14px;
}

.page-head h1 {
    font-size: 38px;
    color: var(--ink);
    letter-spacing: 0.5px;
}

.page-head p {
    margin-top: 14px;
    max-width: 720px;
    color: var(--muted);
    font-size: 16px;
}

/* ---------------------------------------------------------- 法务正文页 */

.doc {
    padding: 54px 0 76px;
}

.doc-body {
    max-width: 900px;
    margin: 0 auto;
    padding: 42px 46px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.doc-body h2 {
    font-size: 21px;
    color: var(--ink);
    margin: 34px 0 12px;
    padding-left: 14px;
    border-left: 4px solid var(--brand);
    letter-spacing: 0.5px;
}

.doc-body h2:first-child {
    margin-top: 0;
}

.doc-body h3 {
    font-size: 17px;
    color: var(--brand-ink);
    margin: 24px 0 10px;
}

.doc-body p {
    margin: 10px 0;
    font-size: 15px;
    color: var(--text);
}

.doc-body .doc-meta {
    padding: 16px 20px;
    border-radius: 12px;
    background: var(--bg-soft);
    border: 1px solid var(--line);
    font-size: 13.5px;
    color: var(--muted);
    margin-bottom: 28px;
}

/* -------------------------------------------------------------- 下载页 */

.dl-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}

.dl {
    padding: 34px 28px;
    border-radius: var(--radius-lg);
    background: #fff;
    border: 1px solid var(--line);
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
}

.dl:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.dl .dl-icon {
    width: 62px;
    height: 62px;
    margin: 0 auto;
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    color: #fff;
    background: linear-gradient(135deg, var(--brand), var(--brand-2));
    box-shadow: 0 10px 24px rgba(15, 159, 176, 0.26);
}

.dl h3 {
    margin-top: 20px;
    font-size: 19px;
    color: var(--ink);
}

.dl p {
    margin-top: 10px;
    font-size: 14px;
    color: var(--muted);
    min-height: 46px;
}

.dl .btn {
    margin-top: 18px;
    padding: 12px 26px;
    font-size: 15px;
}

/* -------------------------------------------------------------- 联系页 */

.contact-grid {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 40px;
}

.contact-list {
    display: grid;
    gap: 18px;
}

.contact-item {
    display: flex;
    gap: 18px;
    padding: 24px;
    border-radius: var(--radius);
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.contact-item .ci-icon {
    flex: 0 0 46px;
    height: 46px;
    border-radius: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 700;
    color: #fff;
    background: linear-gradient(135deg, var(--brand), var(--brand-2));
}

.contact-item b {
    display: block;
    font-size: 15px;
    color: var(--ink);
}

.contact-item span {
    display: block;
    margin-top: 5px;
    font-size: 14.5px;
    color: var(--text);
    word-break: break-all;
}

.contact-item em {
    display: block;
    margin-top: 5px;
    font-style: normal;
    font-size: 12.5px;
    color: var(--muted);
}

.qr-card {
    padding: 30px;
    border-radius: var(--radius-lg);
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    text-align: center;
}

.qr-card b {
    display: block;
    font-size: 15.5px;
    color: var(--ink);
}

.qr-card span {
    display: block;
    margin-top: 6px;
    font-size: 13px;
    color: var(--muted);
}

.qr-card img {
    width: 220px;
    height: 220px;
    object-fit: cover;
    margin: 20px auto 0;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: var(--bg-soft);
}

/* ---------------------------------------------------------------- 响应式 */

@media (max-width: 1024px) {
    .hero-inner {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .grid-3,
    .certs,
    .dl-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .feature {
        grid-template-columns: 1fr;
        gap: 32px;
    }

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

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

@media (max-width: 720px) {
    body {
        font-size: 15.5px;
    }

    .nav-links {
        display: none;
    }

    .nav-cta {
        margin-left: auto;
    }

    .hero {
        padding: 62px 0 58px;
    }

    .hero h1 {
        font-size: 34px;
    }

    .hero-sub {
        font-size: 16px;
    }

    .section {
        padding: 58px 0;
    }

    .section-head h2 {
        font-size: 26px;
    }

    .grid-3,
    .grid-2,
    .certs,
    .dl-grid,
    .stats {
        grid-template-columns: 1fr;
    }

    .doc-body {
        padding: 26px 20px;
    }

    .footer-top {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .page-head h1 {
        font-size: 28px;
    }
}