/* ============ 设计令牌（全站浅色主题统一） ============ */
:root {
    --primary: #2563EB; --primary-hover: #1D4ED8; --primary-light: #EFF6FF;
    --accent: #0EA5E9; --success: #16A34A; --danger: #DC2626;
    --ink: #0B1220; --ink-2: #101B30;
    --text: #0F172A; --text-sub: #5B6577; --text-faint: #94A3B8;
    --bg: #FFFFFF; --bg-soft: #F5F7FA; --border: #E5E7EB;
    --radius-sm: 10px; --radius-md: 16px; --radius-lg: 22px;
    --shadow-sm: 0 1px 2px rgba(16,24,40,.06), 0 1px 3px rgba(16,24,40,.10);
    --shadow-md: 0 10px 30px -12px rgba(15,23,42,.18);
    --shadow-lg: 0 24px 60px -20px rgba(15,23,42,.30);
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
            "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body { font-family: var(--font); color: var(--text); background: var(--bg);
       -webkit-font-smoothing: antialiased; line-height: 1.6; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; }
.container { max-width: 1160px; margin: 0 auto; padding: 0 24px; }

/* ============ 按钮 ============ */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px;
       font-weight: 600; border-radius: var(--radius-sm); cursor: pointer;
       border: 1px solid transparent; transition: all .18s ease; white-space: nowrap; }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 8px 20px -8px rgba(37,99,235,.55); }
.btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); }
.btn-soft { background: var(--primary-light); color: var(--primary); }
.btn-soft:hover { background: #E3EDFF; }
.btn-outline { background: #fff; color: var(--primary); border-color: #BFDBFE; }
.btn-outline:hover { background: var(--primary-light); }
.btn-lg { padding: 15px 34px; font-size: 16px; }
.btn-md { padding: 10px 20px; font-size: 14px; }
.btn-sm { padding: 8px 16px; font-size: 13px; }

/* ============ 导航 ============ */
.nav { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.86);
       backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); }
.nav-inner { max-width: 1160px; margin: 0 auto; padding: 0 24px; height: 66px;
             display: flex; align-items: center; gap: 28px; }
.nav-brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 17px; color: var(--ink); }
.nav-brand svg { width: 26px; height: 26px; }
.nav-brand small { font-weight: 500; font-size: 12px; color: var(--text-faint); }
.nav-links { display: flex; gap: 26px; margin-left: 8px; }
.nav-links a { color: var(--text-sub); font-size: 14px; font-weight: 500; transition: color .15s; }
.nav-links a:hover { color: var(--text); }
.nav-links a.active { color: var(--primary); font-weight: 600; }
.nav-cta { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.nav-entry-sub { color: var(--text-faint) !important; font-size: 13px; font-weight: 500; }
.nav-entry-sub:hover { color: var(--text-sub) !important; }
.burger { display: none; margin-left: auto; background: none; border: 0; cursor: pointer;
          width: 40px; height: 40px; border-radius: 8px; align-items: center; justify-content: center; }
.burger:hover { background: var(--bg-soft); }
.menu { display: none; }
@media (max-width: 860px) {
    .nav-inner { gap: 10px; padding: 0 16px; }
    .nav-links { display: none; }
    .nav-entry-sub { display: none; }
    .burger { display: inline-flex; margin-left: 0; }
    .menu.open { display: block; position: absolute; left: 0; right: 0; top: 66px;
                 background: #fff; border-bottom: 1px solid var(--border);
                 box-shadow: var(--shadow-md); padding: 12px 24px 18px; }
    .menu.open a { display: block; padding: 11px 4px; color: var(--text-sub); font-size: 15px;
                   border-bottom: 1px solid #F1F5F9; }
    .menu.open .menu-sub { color: var(--text-faint); font-size: 14px; border-bottom: 0; }
    .menu.open .btn-primary { display: flex; width: 100%; justify-content: center; color: #fff;
                              padding: 12px; border-bottom: 1px solid transparent; }
}

/* ============ Hero（浅色） ============ */
.hero { position: relative; overflow: hidden; background:
        radial-gradient(900px 480px at 78% -8%, rgba(37,99,235,.14), transparent 60%),
        radial-gradient(700px 420px at 8% 110%, rgba(14,165,233,.12), transparent 55%),
        linear-gradient(165deg, #FFFFFF 0%, #F3F8FF 55%, #FFFFFF 100%);
        border-bottom: 1px solid var(--border); }
.hero-grid-bg { position: absolute; inset: 0; opacity: .55;
    background-image: linear-gradient(rgba(37,99,235,.07) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(37,99,235,.07) 1px, transparent 1px);
    background-size: 46px 46px; mask-image: radial-gradient(ellipse at 50% 0%, #000 30%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse at 50% 0%, #000 30%, transparent 75%); }
.hero-inner { position: relative; max-width: 1160px; margin: 0 auto; padding: 92px 24px 70px;
              display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.hero-kicker { display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px;
               border-radius: 999px; background: var(--primary-light); border: 1px solid #BFDBFE;
               color: var(--primary); font-size: 13px; font-weight: 600; letter-spacing: .4px; }
.hero-kicker .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent);
                    box-shadow: 0 0 0 4px rgba(14,165,233,.18); }
.hero-h1 { margin: 22px 0 18px; font-size: 46px; line-height: 1.18; font-weight: 800; letter-spacing: -.5px; color: var(--ink); }
.hero-h1 .hl { color: var(--primary); }
.hero-sub { color: var(--text-sub); font-size: 17px; max-width: 520px; margin-bottom: 30px; }
.hero-cta { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.hero-cta .btn-lg { padding: 16px 38px; font-size: 17px; }
.hero-note { margin-top: 18px; color: var(--text-faint); font-size: 13px; }
.hero-note .weak-entry { color: var(--text-sub); border-bottom: 1px dashed #CBD5E1; }
.hero-note .weak-entry:hover { color: var(--primary); }
@media (max-width: 1000px) {
    .hero-inner { grid-template-columns: 1fr; padding-top: 64px; }
    .hero-h1 { font-size: 38px; }
}

/* ============ 统计带 ============ */
.stats { background: #fff; border-bottom: 1px solid var(--border); }
.stats-inner { max-width: 1160px; margin: 0 auto; padding: 26px 24px;
               display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.stat { text-align: center; }
.stat b { display: block; font-size: 15px; color: var(--text); font-weight: 700; }
.stat span { font-size: 12.5px; color: var(--text-faint); }
@media (max-width: 700px) { .stats-inner { grid-template-columns: repeat(2, 1fr); row-gap: 20px; } }

/* ============ 通用 section ============ */
.section { padding: 92px 0; }
.section.soft { background: var(--bg-soft); }
.sec-head { max-width: 760px; margin: 0 auto 54px; text-align: center; }
.kicker { display: inline-block; color: var(--primary); font-weight: 700; font-size: 13.5px;
          letter-spacing: 1.5px; margin-bottom: 12px; }
.sec-title { font-size: 34px; font-weight: 800; line-height: 1.25; letter-spacing: -.4px; color: var(--ink); }
.sec-title .hl { color: var(--primary); }
.sec-sub { margin-top: 14px; color: var(--text-sub); font-size: 16px; }
@media (max-width: 700px) { .section { padding: 64px 0; } .sec-title { font-size: 27px; } }

/* ============ 卡片 ============ */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-md);
        padding: 28px 26px; box-shadow: var(--shadow-sm); transition: transform .18s ease, box-shadow .18s ease; }
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.card .tile { width: 50px; height: 50px; border-radius: 14px; display: flex; align-items: center;
              justify-content: center; font-size: 24px; margin-bottom: 16px;
              background: linear-gradient(135deg, var(--primary-light), #F0F9FF); }
.card h3 { font-size: 17.5px; margin-bottom: 8px; }
.card p { color: var(--text-sub); font-size: 14.5px; }
.card .tag { display: inline-block; margin-top: 14px; font-size: 12px; color: var(--primary);
             background: var(--primary-light); padding: 4px 10px; border-radius: 999px; font-weight: 600; }
@media (max-width: 900px) { .grid-3, .grid-2 { grid-template-columns: 1fr; } }

/* ============ 产品矩阵卡（主页） ============ */
.prod-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.prod-card { position: relative; display: flex; flex-direction: column; background: #fff;
             border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 38px 34px;
             box-shadow: var(--shadow-sm); transition: transform .18s ease, box-shadow .18s ease; overflow: hidden; }
.prod-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.prod-card::after { content: ''; position: absolute; inset: 0 0 auto 0; height: 4px;
                    background: linear-gradient(90deg, var(--primary), var(--accent)); }
.prod-icon { width: 58px; height: 58px; border-radius: 16px; display: flex; align-items: center;
             justify-content: center; font-size: 28px; margin-bottom: 20px;
             background: linear-gradient(135deg, var(--primary-light), #F0F9FF); }
.prod-card h3 { font-size: 22px; font-weight: 800; margin-bottom: 6px; color: var(--ink); }
.prod-card .prod-sub { color: var(--text-faint); font-size: 13.5px; margin-bottom: 14px; }
.prod-card p { color: var(--text-sub); font-size: 14.5px; margin-bottom: 22px; }
.prod-links { margin-top: auto; display: flex; align-items: center; gap: 18px; }
.prod-links a.more { font-size: 14.5px; font-weight: 600; color: var(--primary); }
.prod-links a.more:hover { color: var(--primary-hover); }
@media (max-width: 900px) { .prod-grid { grid-template-columns: 1fr; } }

/* ============ 步骤 ============ */
.step-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-md);
             padding: 32px 28px; box-shadow: var(--shadow-sm); text-align: center; }
.step-card .step-no { width: 56px; height: 56px; margin: 0 auto 18px; border-radius: 50%;
                      background: linear-gradient(135deg, #2563EB, #0EA5E9); color: #fff;
                      font-size: 24px; font-weight: 800; display: flex; align-items: center;
                      justify-content: center; box-shadow: 0 10px 22px -10px rgba(37,99,235,.6); }
.step-card h3 { font-size: 18px; margin-bottom: 10px; }
.step-card p { color: var(--text-sub); font-size: 14.5px; }
.step-card .step-meta { margin-top: 14px; display: inline-block; font-size: 12.5px; color: var(--primary);
                        background: var(--primary-light); padding: 5px 12px; border-radius: 999px; font-weight: 600; }

/* ============ CTA 横幅（浅色） ============ */
.join { position: relative; overflow: hidden; text-align: center; background:
        radial-gradient(720px 420px at 50% -10%, rgba(37,99,235,.16), transparent 60%),
        linear-gradient(165deg, #FFFFFF, #EFF6FF); border-top: 1px solid var(--border);
        border-bottom: 1px solid var(--border); }
.join-inner { max-width: 820px; margin: 0 auto; padding: 96px 24px; position: relative; }
.join h2 { font-size: 38px; font-weight: 800; line-height: 1.25; letter-spacing: -.4px; color: var(--ink); }
.join h2 .hl { color: var(--primary); }
.join p { color: var(--text-sub); margin: 18px auto 34px; max-width: 620px; font-size: 16px; }
.join .btn-lg { padding: 18px 46px; font-size: 18px; }
.join-weak { margin-top: 22px; font-size: 14px; color: var(--text-faint); }
.join-weak a { color: var(--text-sub); border-bottom: 1px dashed #CBD5E1; }
.join-weak a:hover { color: var(--primary); }
.join-steps { display: flex; justify-content: center; gap: 26px; margin-top: 46px; flex-wrap: wrap;
              color: var(--text-sub); font-size: 13px; }
.join-steps span { display: inline-flex; align-items: center; gap: 8px; }
.join-steps .n { width: 22px; height: 22px; border-radius: 50%; background: var(--primary-light);
                 border: 1px solid #BFDBFE; color: var(--primary); font-weight: 700;
                 font-size: 12px; display: inline-flex; align-items: center; justify-content: center; }

/* ============ FAQ ============ */
.faq-list { max-width: 780px; margin: 0 auto; }
.faq-item { border: 1px solid var(--border); border-radius: var(--radius-md); margin-bottom: 14px;
            background: #fff; overflow: hidden; }
.faq-q { width: 100%; text-align: left; background: none; border: 0; cursor: pointer;
         padding: 20px 22px; font-size: 16px; font-weight: 600; color: var(--text);
         display: flex; align-items: center; justify-content: space-between; gap: 14px; font-family: var(--font); }
.faq-q .chev { transition: transform .2s ease; color: var(--text-faint); flex: 0 0 auto; }
.faq-item.open .faq-q .chev { transform: rotate(180deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .25s ease; }
.faq-a p { padding: 0 22px 20px; color: var(--text-sub); font-size: 14.5px; }

/* ============ 联系我们 ============ */
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.contact-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-md);
                padding: 30px 26px; box-shadow: var(--shadow-sm); text-align: center; }
.contact-card .tile { width: 52px; height: 52px; border-radius: 14px; margin: 0 auto 16px;
                      display: flex; align-items: center; justify-content: center; font-size: 24px;
                      background: linear-gradient(135deg, var(--primary-light), #F0F9FF); }
.contact-card h3 { font-size: 16.5px; margin-bottom: 8px; }
.contact-card p { color: var(--text-sub); font-size: 14px; }
.contact-card a { color: var(--primary); font-weight: 600; }
.contact-card a:hover { color: var(--primary-hover); }
@media (max-width: 900px) { .contact-grid { grid-template-columns: 1fr; } }

/* ============ Footer ============ */
.footer { background: var(--bg-soft); border-top: 1px solid var(--border); color: var(--text-sub); padding: 64px 0 30px; }
.footer-inner { max-width: 1160px; margin: 0 auto; padding: 0 24px;
                display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; }
.footer-brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: var(--ink); font-size: 17px; margin-bottom: 12px; }
.footer-brand svg { width: 24px; height: 24px; }
.footer p.desc { font-size: 13.5px; max-width: 320px; }
.footer h4 { color: var(--text); font-size: 13px; letter-spacing: 1px; margin-bottom: 16px; }
.footer ul { list-style: none; }
.footer li { margin-bottom: 10px; }
.footer a { font-size: 14px; color: var(--text-sub); transition: color .15s; }
.footer a:hover { color: var(--primary); }
.footer a.m-strong { color: var(--text); font-weight: 600; }
.footer a.m-strong:hover { color: var(--primary); }
.footer-legacy { margin-top: 14px; font-size: 12px; color: var(--text-faint); }
.footer-legacy a { font-size: 12px; color: var(--text-faint); border-bottom: 1px dashed #CBD5E1; }
.footer-legacy a:hover { color: var(--primary); border-color: var(--primary); }
.footer-bottom { max-width: 1160px; margin: 40px auto 0; padding: 22px 24px 0;
                 border-top: 1px solid var(--border); display: flex; flex-direction: column;
                 gap: 12px; font-size: 12.5px; color: var(--text-faint); }
.fb-row { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.fb-icp { display: flex; align-items: center; justify-content: center; gap: 7px; flex-wrap: wrap; }
.fb-icp a { color: var(--text-faint); font-size: 12.5px; }
.fb-icp a:hover { color: var(--primary); }
@media (max-width: 800px) { .footer-inner { grid-template-columns: 1fr; gap: 30px; } }

/* ============ 滚动入场 ============ */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
    .reveal { opacity: 1; transform: none; transition: none; }
    * { animation: none !important; }
}