/* =========================================================
   飞达复合材料 — 现代化响应式样式
   ========================================================= */

:root{
  --primary:#0f3d52;
  --primary-2:#15616d;
  --primary-3:#2a9d8f;
  --accent:#ff7a3c;
  --accent-dark:#e85f1f;
  --ink:#1f2d3d;
  --muted:#5b6b7b;
  --line:#e6ecf1;
  --bg:#ffffff;
  --bg-soft:#f4f7f9;
  --bg-dark:#0b2630;
  --radius:16px;
  --shadow-sm:0 4px 14px rgba(15,61,82,.08);
  --shadow-md:0 14px 40px rgba(15,61,82,.14);
  --maxw:1180px;
  --font:"Segoe UI","PingFang SC","Microsoft YaHei","Hiragino Sans GB",Roboto,Helvetica,Arial,sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font);
  color:var(--ink);
  background:var(--bg);
  line-height:1.7;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul{list-style:none}

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

/* ---------- Top bar ---------- */
.topbar{
  background:var(--bg-dark);
  color:#cfe3ea;
  font-size:13px;
}
.topbar .container{display:flex;justify-content:space-between;align-items:center;height:38px;gap:12px;flex-wrap:wrap}
.topbar a:hover{color:#fff}
.topbar .tb-left{display:flex;gap:18px;align-items:center;flex-wrap:wrap}
.topbar .tb-right{display:flex;gap:18px;align-items:center;flex-wrap:wrap}
.topbar i{color:var(--accent);font-style:normal;margin-right:6px}

/* ---------- Header / Nav ---------- */
.header{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid var(--line);
}
.header .container{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:12px}
.brand .logo{
  width:42px;height:42px;flex:0 0 42px;
  background:linear-gradient(135deg,var(--primary),var(--primary-3));
  border-radius:11px;display:grid;place-items:center;color:#fff;
  box-shadow:var(--shadow-sm);
}
.brand .logo svg{width:24px;height:24px}
.brand .name{font-weight:800;font-size:18px;color:var(--primary);letter-spacing:.3px;line-height:1.15}
.brand .name small{display:block;font-weight:500;font-size:11px;color:var(--muted);letter-spacing:1px}

.nav{display:flex;align-items:center;gap:6px}
.nav a{
  padding:9px 16px;border-radius:10px;font-weight:600;font-size:15px;color:var(--ink);
  transition:.2s;
}
.nav a:hover{background:var(--bg-soft);color:var(--primary)}
.nav a.active{color:var(--primary);background:var(--bg-soft)}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 22px;border-radius:999px;font-weight:700;font-size:15px;
  background:var(--accent);color:#fff;border:none;cursor:pointer;transition:.2s;
  box-shadow:0 8px 22px rgba(255,122,60,.35);
}
.btn:hover{background:var(--accent-dark);transform:translateY(-2px);box-shadow:0 12px 28px rgba(255,122,60,.42)}
.btn.ghost{background:transparent;color:var(--primary);border:1.5px solid var(--primary);box-shadow:none}
.btn.ghost:hover{background:var(--primary);color:#fff;transform:translateY(-2px)}
.btn.light{background:#fff;color:var(--primary);box-shadow:0 8px 22px rgba(0,0,0,.18)}
.btn.light:hover{background:#eef6f8}

.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.hamburger span{width:24px;height:2.5px;background:var(--primary);border-radius:3px;transition:.3s}

/* ---------- Hero ---------- */
.hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(1100px 500px at 80% -10%,rgba(42,157,143,.45),transparent 60%),
    radial-gradient(900px 500px at 10% 110%,rgba(255,122,60,.25),transparent 55%),
    linear-gradient(135deg,#0b2630 0%,#0f3d52 55%,#15616d 100%);
  color:#fff;
}
.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;pointer-events:none;
}
.hero .container{position:relative;z-index:2;padding:96px 24px 110px;display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center}
.hero .eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.25);
  padding:7px 16px;border-radius:999px;font-size:13px;font-weight:600;letter-spacing:.5px;margin-bottom:22px;
}
.hero h1{font-size:clamp(30px,4.4vw,52px);line-height:1.18;font-weight:800;letter-spacing:.5px;margin-bottom:20px}
.hero h1 span{color:var(--accent)}
.hero p.lead{font-size:18px;color:#cfe3ea;max-width:560px;margin-bottom:32px}
.hero .cta{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{display:flex;gap:30px;margin-top:46px;flex-wrap:wrap}
.hero-stats .stat .num{font-size:34px;font-weight:800;color:#fff;line-height:1}
.hero-stats .stat .num b{color:var(--accent)}
.hero-stats .stat .lbl{font-size:13px;color:#aac6d0;margin-top:4px}

/* hero visual card */
.hero-card{
  background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);
  border-radius:22px;padding:26px;backdrop-filter:blur(6px);box-shadow:var(--shadow-md);
}
.hero-card h3{font-size:18px;margin-bottom:16px;display:flex;align-items:center;gap:10px}
.hero-card h3 .dot{width:10px;height:10px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px rgba(255,122,60,.25)}
.hero-card ul li{display:flex;gap:12px;padding:11px 0;border-bottom:1px dashed rgba(255,255,255,.15);color:#e3eef2;font-size:15px}
.hero-card ul li:last-child{border-bottom:0}
.hero-card ul li .ic{color:var(--accent);font-weight:800}
.hero-card .mini{margin-top:18px;font-size:13px;color:#9fbec9}

/* blob decor */
.blob{position:absolute;border-radius:50%;filter:blur(8px);opacity:.5;pointer-events:none}

/* ---------- Section base ---------- */
.section{padding:86px 0}
.section.soft{background:var(--bg-soft)}
.section-head{text-align:center;max-width:720px;margin:0 auto 52px}
.section-head .tag{
  display:inline-block;color:var(--accent);font-weight:700;letter-spacing:2px;font-size:13px;
  text-transform:uppercase;margin-bottom:12px;
}
.section-head h2{font-size:clamp(26px,3.4vw,38px);font-weight:800;color:var(--primary);line-height:1.25}
.section-head p{color:var(--muted);margin-top:14px;font-size:16px}

/* ---------- About ---------- */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:54px;align-items:center}
.about-text h2{font-size:clamp(24px,3vw,34px);color:var(--primary);font-weight:800;margin-bottom:18px;line-height:1.3}
.about-text p{color:var(--muted);margin-bottom:16px}
.about-text .hl{color:var(--primary-2);font-weight:700}
.about-points{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:26px}
.about-points .pt{display:flex;gap:12px;align-items:flex-start}
.about-points .pt .ic{
  width:38px;height:38px;flex:0 0 38px;border-radius:10px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--primary),var(--primary-3));color:#fff;font-weight:800;
}
.about-points .pt b{display:block;color:var(--ink);font-size:15px}
.about-points .pt span{font-size:13px;color:var(--muted)}
.about-visual{
  position:relative;border-radius:var(--radius);overflow:hidden;min-height:380px;
  background:linear-gradient(135deg,#0f3d52,#2a9d8f);
  display:grid;place-items:center;color:#fff;box-shadow:var(--shadow-md);
}
.about-visual .ring{
  width:230px;height:230px;border-radius:50%;border:2px solid rgba(255,255,255,.25);
  display:grid;place-items:center;text-align:center;padding:24px;
}
.about-visual .ring .big{font-size:54px;font-weight:800;color:var(--accent)}
.about-visual .ring small{display:block;color:#d6e7ec;font-size:14px;margin-top:6px}
.about-visual .badge{
  position:absolute;left:20px;bottom:20px;background:rgba(255,255,255,.14);
  border:1px solid rgba(255,255,255,.25);backdrop-filter:blur(4px);
  padding:12px 18px;border-radius:12px;font-size:13px;
}
.about-visual .badge b{display:block;font-size:20px;color:#fff}

/* ---------- Products ---------- */
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.product-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:0;transition:.25s;box-shadow:var(--shadow-sm);position:relative;overflow:hidden;
}
.product-card::before{
  content:"";position:absolute;left:0;top:0;height:4px;width:0;background:linear-gradient(90deg,var(--primary),var(--accent));transition:.3s;z-index:2;
}
.product-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-md);border-color:transparent}
.product-card:hover::before{width:100%}
.product-card .thumb{
  position:relative;width:100%;aspect-ratio:4/3;overflow:hidden;background:#eaf4f3;
}
.product-card .thumb img{
  width:100%;height:100%;object-fit:cover;transition:transform .5s ease;
}
.product-card:hover .thumb img{transform:scale(1.06)}
.product-card .thumb .badge{
  position:absolute;left:12px;top:12px;background:rgba(15,61,82,.85);color:#fff;
  font-size:11px;font-weight:700;padding:4px 10px;border-radius:999px;letter-spacing:.5px;
}
.product-card .body{padding:22px 24px 24px}
.product-card .pic{
  width:48px;height:48px;border-radius:12px;display:grid;place-items:center;margin-bottom:14px;
  background:linear-gradient(135deg,#eaf4f3,#dff0ee);color:var(--primary-2);
}
.product-card .pic svg{width:26px;height:26px}
.product-card h3{font-size:19px;color:var(--primary);margin-bottom:8px;font-weight:800}
.product-card p{font-size:14px;color:var(--muted);min-height:44px}
.product-card .more{margin-top:14px;font-weight:700;color:var(--accent);font-size:14px;display:inline-flex;align-items:center;gap:6px}

/* ---------- Applications ---------- */
.app-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:16px}
.app-item{
  background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px 14px;text-align:center;
  transition:.25s;box-shadow:var(--shadow-sm);
}
.app-item:hover{transform:translateY(-4px);border-color:var(--primary-3);box-shadow:var(--shadow-md)}
.app-item .ic{font-size:30px;margin-bottom:8px}
.app-item span{font-size:14px;font-weight:600;color:var(--ink)}

/* ---------- Why us ---------- */
.why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.why-card{
  background:#fff;border-radius:var(--radius);padding:30px 24px;text-align:center;
  border:1px solid var(--line);transition:.25s;
}
.why-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-md)}
.why-card .ic{
  width:60px;height:60px;margin:0 auto 16px;border-radius:16px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--primary),var(--primary-3));color:#fff;
}
.why-card .ic svg{width:30px;height:30px}
.why-card h3{font-size:18px;color:var(--primary);margin-bottom:8px}
.why-card p{font-size:14px;color:var(--muted)}

/* ---------- CTA banner ---------- */
.cta-banner{
  background:linear-gradient(135deg,#0f3d52,#15616d);color:#fff;border-radius:22px;
  padding:50px 48px;display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap;
  box-shadow:var(--shadow-md);position:relative;overflow:hidden;
}
.cta-banner::after{content:"";position:absolute;right:-60px;top:-60px;width:240px;height:240px;border-radius:50%;background:rgba(255,122,60,.25);filter:blur(10px)}
.cta-banner h2{font-size:28px;font-weight:800;position:relative;z-index:2}
.cta-banner p{color:#cfe3ea;margin-top:8px;position:relative;z-index:2}
.cta-banner .cta{position:relative;z-index:2}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.contact-info .info-card{
  background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:28px;margin-bottom:18px;
}
.contact-info h3{color:var(--primary);font-size:20px;margin-bottom:16px}
.info-row{display:flex;gap:14px;padding:10px 0;border-bottom:1px dashed var(--line);font-size:15px}
.info-row:last-child{border-bottom:0}
.info-row .ic{color:var(--accent);font-weight:800;flex:0 0 22px}
.info-row b{display:block;color:var(--ink);font-weight:700}
.info-row span{color:var(--muted)}
.map-box{
  border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);height:240px;
  background:linear-gradient(135deg,#dfe9ee,#cfe0e7);display:grid;place-items:center;color:var(--muted);position:relative;
}
.map-box .pin{position:absolute;font-size:34px;color:var(--accent);animation:bounce 2s infinite}
@keyframes bounce{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}

.form{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow-sm);
}
.form h3{color:var(--primary);font-size:20px;margin-bottom:18px}
.field{margin-bottom:16px}
.field label{display:block;font-size:14px;font-weight:600;color:var(--ink);margin-bottom:6px}
.field input,.field textarea,.field select{
  width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;font-family:inherit;font-size:15px;
  color:var(--ink);transition:.2s;background:#fbfdfe;
}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--primary-3);box-shadow:0 0 0 3px rgba(42,157,143,.15)}
.field textarea{resize:vertical;min-height:110px}
.form .btn{width:100%;justify-content:center;margin-top:6px}
.form .note{font-size:13px;color:var(--muted);margin-top:12px;text-align:center}

/* ---------- Footer ---------- */
.footer{background:var(--bg-dark);color:#bcd2da;padding:60px 0 26px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px}
.footer .brand .name{color:#fff}
.footer .brand .name small{color:#7f9aa6}
.footer p.desc{margin:16px 0;font-size:14px;color:#9fb8c2;max-width:320px}
.footer h4{color:#fff;font-size:16px;margin-bottom:16px;font-weight:700}
.footer ul li{margin-bottom:10px;font-size:14px}
.footer ul li a:hover{color:var(--accent)}
.footer .f-contact li{display:flex;gap:10px;color:#9fb8c2}
.footer .f-contact li b{color:#cfe3ea;font-weight:600}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:40px;padding-top:22px;text-align:center;font-size:13px;color:#7f9aa6}

/* ---------- Reveal animation ----------
   设计原则：JS 加载失败也必须可见。
   默认 .reveal 就是可见的。只有当 <html> 上有 .js-anim 类时
   才将它们默认隐藏，再用 IntersectionObserver 逐个加 .show。
   .js-anim 类仅由 main.js 启动时主动加上（保证 JS 跑成功才启用动画）。*/
.js-anim .reveal{opacity:0;transform:translateY(24px);transition:.7s cubic-bezier(.2,.7,.2,1)}
.reveal.show{opacity:1;transform:none}

/* ---------- Responsive ---------- */
@media(max-width:980px){
  .hero .container{grid-template-columns:1fr;padding-top:70px;padding-bottom:80px}
  .hero-card{order:-1}
  .about-grid{grid-template-columns:1fr;gap:34px}
  .about-visual{min-height:300px}
  .product-grid{grid-template-columns:repeat(2,1fr)}
  .why-grid{grid-template-columns:repeat(2,1fr)}
  .app-grid{grid-template-columns:repeat(3,1fr)}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:720px){
  .nav{
    position:fixed;top:110px;right:16px;left:16px;flex-direction:column;align-items:stretch;gap:4px;
    background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px;box-shadow:var(--shadow-md);
    transform:translateY(-12px);opacity:0;pointer-events:none;transition:.25s;
  }
  .nav.open{transform:none;opacity:1;pointer-events:auto}
  .nav a{padding:12px 16px}
  .header .btn.nav-cta{display:none}
  .hamburger{display:flex}
  .topbar{font-size:12px}
  .topbar .tb-left{display:none}
  .section{padding:60px 0}
  .about-points{grid-template-columns:1fr}
  .product-grid{grid-template-columns:1fr}
  .why-grid{grid-template-columns:1fr}
  .app-grid{grid-template-columns:repeat(2,1fr)}
  .cta-banner{padding:34px 26px}
  .footer-grid{grid-template-columns:1fr}
  .hero-stats{gap:20px}
}
.pb-0{padding-bottom:0}