/* ============================================================
   雁航 EBFDP 官网 — 设计系统 v2
   现代 SaaS 风格，参考 Stripe / Linear / Vercel
   ============================================================ */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --blue-600:#2563eb; --blue-700:#1d4ed8; --blue-500:#3b82f6; --blue-100:#dbeafe; --blue-50:#eff6ff;
  --cyan:#06b6d4; --green:#10b981; --amber:#f59e0b; --red:#ef4444;
  --ink-900:#0f172a; --ink-800:#1e293b; --ink-700:#334155; --ink-600:#475569;
  --ink-500:#64748b; --ink-400:#94a3b8; --ink-300:#cbd5e1; --ink-200:#e2e8f0; --ink-100:#f1f5f9; --ink-50:#f8fafc;
  --white:#fff;
  --grad-brand:linear-gradient(135deg,#2563eb 0%,#06b6d4 100%);
  --grad-hero:linear-gradient(160deg,#0b1f4b 0%,#123a8f 45%,#1d4ed8 100%);
  --shadow-sm:0 1px 2px rgba(15,23,42,.06);
  --shadow-md:0 4px 12px rgba(15,23,42,.08);
  --shadow-lg:0 12px 32px rgba(15,23,42,.12);
  --shadow-xl:0 24px 64px rgba(15,23,42,.16);
  --r-sm:8px; --r-md:12px; --r-lg:16px; --r-xl:24px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink-800);background:var(--white);line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--blue-600);text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:1180px;margin:0 auto;padding:0 24px}
svg.i{width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}

/* ---------- 导航 ---------- */
.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.85);backdrop-filter:blur(14px);border-bottom:1px solid var(--ink-200)}
.nav .container{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.brand-mark{width:38px;height:38px;border-radius:10px;background:var(--grad-brand);display:grid;place-items:center;color:#fff;font-weight:800;font-size:19px;box-shadow:0 4px 12px rgba(37,99,235,.35)}
.brand-name{font-size:19px;font-weight:800;color:var(--ink-900);letter-spacing:.2px}
.brand-name em{font-style:normal;color:var(--blue-600)}
.nav-menu{display:flex;align-items:center;gap:6px;list-style:none}
.nav-menu a{display:block;padding:8px 14px;border-radius:8px;color:var(--ink-600);font-size:14.5px;font-weight:500;transition:.18s}
.nav-menu a:hover{color:var(--blue-600);background:var(--blue-50)}
.nav-menu a.btn-nav{background:var(--blue-600);color:#fff;margin-left:8px;font-weight:600}
.nav-menu a.btn-nav:hover{background:var(--blue-700)}

/* ---------- Hero ---------- */
.hero{background:var(--grad-hero);color:#fff;position:relative;overflow:hidden;padding:96px 0 110px}
.hero::before{content:"";position:absolute;inset:0;background:
  radial-gradient(700px 340px at 85% 10%,rgba(6,182,212,.28),transparent 65%),
  radial-gradient(600px 300px at 10% 90%,rgba(59,130,246,.30),transparent 65%)}
.hero .container{position:relative;display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero-eyebrow{display:inline-flex;align-items:center;gap:8px;padding:6px 14px;border:1px solid rgba(255,255,255,.25);background:rgba(255,255,255,.08);border-radius:999px;font-size:13px;font-weight:600;letter-spacing:.4px;margin-bottom:22px}
.hero-eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 10px var(--cyan)}
.hero h1{font-size:46px;line-height:1.22;font-weight:800;letter-spacing:-.5px;margin-bottom:18px}
.hero h1 .hl{background:linear-gradient(90deg,#7dd3fc,#a5f3fc);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:17.5px;color:rgba(255,255,255,.82);max-width:520px;margin-bottom:32px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:9px;padding:13px 26px;border-radius:10px;font-weight:600;font-size:15.5px;transition:.2s;border:1px solid transparent;cursor:pointer}
.btn-light{background:#fff;color:var(--blue-700)}
.btn-light:hover{transform:translateY(-2px);box-shadow:0 10px 28px rgba(0,0,0,.25)}
.btn-ghost{border-color:rgba(255,255,255,.35);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.1)}
.btn-solid{background:var(--blue-600);color:#fff}
.btn-solid:hover{background:var(--blue-700)}
.hero-points{display:flex;gap:22px;margin-top:30px;flex-wrap:wrap}
.hero-points span{display:inline-flex;align-items:center;gap:7px;font-size:13.5px;color:rgba(255,255,255,.75)}
.hero-points svg{width:16px;height:16px;color:var(--cyan)}

/* ---------- 仪表盘模拟图 ---------- */
.dash{background:#0d1b3e;border:1px solid rgba(255,255,255,.14);border-radius:var(--r-lg);box-shadow:var(--shadow-xl);overflow:hidden;font-size:12px}
.dash-bar{display:flex;align-items:center;gap:6px;padding:10px 14px;background:rgba(255,255,255,.05);border-bottom:1px solid rgba(255,255,255,.1)}
.dash-bar i{width:10px;height:10px;border-radius:50%}
.dash-bar i:nth-child(1){background:#ef4444}.dash-bar i:nth-child(2){background:#f59e0b}.dash-bar i:nth-child(3){background:#10b981}
.dash-bar span{margin-left:8px;color:rgba(255,255,255,.5);font-size:11px}
.dash-body{display:grid;grid-template-columns:150px 1fr;min-height:330px}
.dash-side{border-right:1px solid rgba(255,255,255,.08);padding:14px 10px;display:flex;flex-direction:column;gap:4px}
.dash-side a{color:rgba(255,255,255,.55);padding:7px 10px;border-radius:7px;display:flex;gap:8px;align-items:center;font-size:12px}
.dash-side a.on{background:rgba(59,130,246,.25);color:#bfdbfe}
.dash-side svg{width:14px;height:14px}
.dash-main{padding:16px}
.dash-kpis{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:14px}
.kpi{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.09);border-radius:10px;padding:10px 12px}
.kpi b{display:block;font-size:16px;color:#fff}
.kpi span{color:rgba(255,255,255,.5);font-size:10.5px}
.kpi .up{color:#34d399;font-size:10px}
.dash-chart{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);border-radius:10px;padding:12px;margin-bottom:14px}
.dash-chart h5{color:rgba(255,255,255,.6);font-size:11px;font-weight:600;margin-bottom:10px}
.bars{display:flex;align-items:flex-end;gap:8px;height:70px}
.bars i{flex:1;border-radius:4px 4px 0 0;background:var(--grad-brand);opacity:.85}
.dash-table{width:100%;border-collapse:collapse}
.dash-table th{color:rgba(255,255,255,.45);text-align:left;font-weight:600;font-size:10.5px;padding:6px 8px;border-bottom:1px solid rgba(255,255,255,.1)}
.dash-table td{color:rgba(255,255,255,.75);padding:7px 8px;font-size:11px;border-bottom:1px solid rgba(255,255,255,.06)}
.tag{padding:2px 8px;border-radius:999px;font-size:10px;font-weight:600}
.tag.g{background:rgba(16,185,129,.2);color:#6ee7b7}
.tag.b{background:rgba(59,130,246,.2);color:#93c5fd}
.tag.a{background:rgba(245,158,11,.2);color:#fcd34d}

/* ---------- 数据统计条 ---------- */
.stats{background:var(--ink-900);color:#fff;padding:44px 0}
.stats .container{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat b{font-size:34px;font-weight:800}
.stat b em{font-style:normal;color:var(--cyan)}
.stat span{display:block;color:var(--ink-400);font-size:13.5px;margin-top:4px}

/* ---------- 通用区块 ---------- */
.section{padding:92px 0}
.section.tint{background:var(--ink-50)}
.sec-head{text-align:center;max-width:680px;margin:0 auto 56px}
.sec-kicker{display:inline-block;color:var(--blue-600);background:var(--blue-50);border:1px solid var(--blue-100);padding:5px 14px;border-radius:999px;font-size:13px;font-weight:700;letter-spacing:.5px;margin-bottom:16px}
.sec-head h2{font-size:34px;font-weight:800;color:var(--ink-900);letter-spacing:-.4px;margin-bottom:14px}
.sec-head p{color:var(--ink-500);font-size:17px}

/* ---------- 功能卡片 ---------- */
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.cards.cols3{grid-template-columns:repeat(3,1fr)}
.card{background:#fff;border:1px solid var(--ink-200);border-radius:var(--r-lg);padding:30px;transition:.22s;box-shadow:var(--shadow-sm)}
.card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:var(--blue-100)}
.card .ic{width:52px;height:52px;border-radius:13px;display:grid;place-items:center;margin-bottom:18px;color:#fff}
.ic.b{background:var(--grad-brand)}.ic.g{background:linear-gradient(135deg,#10b981,#34d399)}.ic.c{background:linear-gradient(135deg,#06b6d4,#22d3ee)}.ic.p{background:linear-gradient(135deg,#8b5cf6,#a78bfa)}.ic.a{background:linear-gradient(135deg,#f59e0b,#fbbf24)}.ic.r{background:linear-gradient(135deg,#ef4444,#f87171)}
.card h3{font-size:19px;font-weight:700;color:var(--ink-900);margin-bottom:10px}
.card p{color:var(--ink-500);font-size:14.5px;margin-bottom:14px}
.card ul{list-style:none}
.card li{position:relative;padding:5px 0 5px 26px;color:var(--ink-600);font-size:13.5px}
.card li::before{content:"";position:absolute;left:0;top:9px;width:16px;height:16px;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2310b981' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E") center/contain no-repeat}

/* ---------- 平台 ---------- */
.plats{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.plat{background:#fff;border:1px solid var(--ink-200);border-radius:var(--r-lg);padding:28px;text-align:center;transition:.22s;box-shadow:var(--shadow-sm)}
.plat:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.plat .logo{width:64px;height:64px;border-radius:16px;margin:0 auto 14px;display:grid;place-items:center;color:#fff;font-size:26px;font-weight:800}
.plat h4{font-size:17px;font-weight:700;color:var(--ink-900);margin-bottom:8px}
.plat p{font-size:13px;color:var(--ink-500);margin-bottom:12px}
.plat .st{display:inline-block;padding:4px 12px;border-radius:999px;font-size:12px;font-weight:600}
.st.ok{background:#d1fae5;color:#047857}
.st.plan{background:var(--ink-100);color:var(--ink-500)}

/* ---------- 工作流程 ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;position:relative}
.step{text-align:center;position:relative;padding:0 8px}
.step .num{width:52px;height:52px;border-radius:50%;background:var(--grad-brand);color:#fff;font-size:20px;font-weight:800;display:grid;place-items:center;margin:0 auto 16px;box-shadow:0 6px 16px rgba(37,99,235,.3)}
.step h4{font-size:17px;font-weight:700;color:var(--ink-900);margin-bottom:8px}
.step p{font-size:13.5px;color:var(--ink-500)}
.step:not(:last-child)::after{content:"";position:absolute;top:26px;left:calc(50% + 34px);width:calc(100% - 68px);height:2px;background:var(--ink-200)}

/* ---------- 安全 ---------- */
.sec-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.sec-item{display:flex;gap:16px;background:#fff;border:1px solid var(--ink-200);border-radius:var(--r-md);padding:22px}
.sec-item .ic{width:44px;height:44px;border-radius:11px;display:grid;place-items:center;flex-shrink:0;color:#fff}
.sec-item h4{font-size:16px;font-weight:700;color:var(--ink-900);margin-bottom:5px}
.sec-item p{font-size:13.5px;color:var(--ink-500)}

/* ---------- 内容页 ---------- */
.page-head{background:var(--grad-hero);color:#fff;padding:72px 0;text-align:center}
.page-head h1{font-size:38px;font-weight:800;letter-spacing:-.4px;margin-bottom:12px}
.page-head p{color:rgba(255,255,255,.8);font-size:17px;max-width:640px;margin:0 auto}
.prose{max-width:860px;margin:0 auto}
.prose h2{font-size:26px;font-weight:800;color:var(--ink-900);margin:44px 0 16px}
.prose h2:first-child{margin-top:0}
.prose h3{font-size:19px;font-weight:700;color:var(--blue-700);margin:28px 0 10px}
.prose p{margin-bottom:14px;color:var(--ink-700)}
.prose ul,.prose ol{margin:0 0 18px 22px;color:var(--ink-700)}
.prose li{margin-bottom:7px}
.prose code{background:var(--blue-50);color:var(--blue-700);padding:2px 7px;border-radius:5px;font-size:13.5px;font-family:"SF Mono",Consolas,Monaco,monospace}
.prose table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14.5px;border-radius:10px;overflow:hidden;box-shadow:var(--shadow-sm)}
.prose th,.prose td{border:1px solid var(--ink-200);padding:12px 16px;text-align:left;vertical-align:top}
.prose th{background:var(--ink-50);font-weight:700;color:var(--ink-800)}
.prose tr:nth-child(even) td{background:var(--ink-50)}
.callout{background:var(--blue-50);border-left:4px solid var(--blue-600);border-radius:8px;padding:18px 22px;margin:22px 0}
.callout p{margin:0;color:var(--ink-700)}

/* ---------- CTA ---------- */
.cta{background:var(--grad-brand);color:#fff;text-align:center;padding:76px 0}
.cta h2{font-size:30px;font-weight:800;margin-bottom:12px}
.cta p{font-size:17px;opacity:.9;margin-bottom:30px}
.cta .btn-light{padding:14px 40px}

/* ---------- 页脚 ---------- */
.footer{background:var(--ink-900);color:var(--ink-400);padding:60px 0 28px}
.foot-grid{display:grid;grid-template-columns:2.2fr 1fr 1fr 1fr;gap:40px}
.foot-brand .brand-name{color:#fff;font-size:18px;font-weight:700;margin-bottom:12px}
.foot-brand p{font-size:13.5px;line-height:1.7;margin-bottom:6px}
.foot-col h5{color:#fff;font-size:14px;font-weight:700;margin-bottom:14px}
.foot-col a{display:block;color:var(--ink-400);font-size:13.5px;margin-bottom:9px;transition:.15s}
.foot-col a:hover{color:#fff}
.foot-bottom{border-top:1px solid var(--ink-800);margin-top:44px;padding-top:20px;text-align:center;font-size:12.5px;color:var(--ink-500)}

/* ---------- 响应式 ---------- */
@media(max-width:960px){
  .hero .container{grid-template-columns:1fr}
  .cards,.cards.cols3,.plats,.sec-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .step::after{display:none}
  .stats .container{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .nav-menu{display:none}
  .hero h1{font-size:32px}
  .cards,.cards.cols3,.plats,.sec-grid,.steps{grid-template-columns:1fr}
  .stats .container{grid-template-columns:1fr 1fr}
  .foot-grid{grid-template-columns:1fr}
  .dash-body{grid-template-columns:1fr}
  .dash-side{display:none}
  .dash-kpis{grid-template-columns:repeat(2,1fr)}
}