:root{--primary:#1a365d;--primary-2:#112846;--accent:#e8712b;--accent-2:#c95f1f;--ink:#17324a;--muted:#5d7085;--line:#d9e3ee;--bg:#f4f8fc;--white:#ffffff;--radius-lg:24px;--radius-md:18px;--radius-sm:12px;--shadow-soft:0 16px 34px rgba(18,40,70,0.1);--shadow-pop:0 20px 48px rgba(14,33,57,0.18);--container:1180px;--nav-h:78px;--ease:0.35s ease}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:var(--white);line-height:1.65}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
section{scroll-margin-top:calc(var(--nav-h) + 16px)}
.container{width:min(calc(100% - 40px),var(--container));margin:0 auto}
.section{padding:96px 0}
.section-head{max-width:760px;margin-bottom:42px}
.eyebrow{display:inline-flex;align-items:center;margin-bottom:14px;padding:7px 13px;border-radius:999px;background:rgba(232,113,43,0.12);color:var(--accent);font-size:.82rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em}
h1,h2,h3{line-height:1.15}
h1{font-size:clamp(2.6rem,6vw,4.8rem);margin-bottom:14px}
h2{font-size:clamp(2rem,4vw,3rem);margin-bottom:12px;color:var(--primary)}
h3{font-size:1.2rem}
p.lead{font-size:1.06rem;color:var(--muted)}
.btn{display:inline-flex;align-items:center;justify-content:center;border:none;cursor:pointer;min-height:50px;padding:0 24px;border-radius:999px;font-weight:700;transition:transform var(--ease),background var(--ease),box-shadow var(--ease),color var(--ease)}
.btn-primary{color:var(--white);background:var(--accent);box-shadow:0 10px 24px rgba(232,113,43,0.28)}
.btn-primary:hover{background:var(--accent-2);transform:translateY(-2px)}
.btn-ghost{color:var(--white);border:1px solid rgba(255,255,255,0.28);background:rgba(255,255,255,0.08);backdrop-filter:blur(8px)}
.btn-ghost:hover{transform:translateY(-2px);background:rgba(255,255,255,0.14)}
.site-header{position:fixed;top:0;left:0;z-index:1000;width:100%;background:rgba(17,40,70,0.82);border-bottom:1px solid rgba(255,255,255,0.08);backdrop-filter:blur(14px)}
.nav-wrap{min-height:var(--nav-h);display:flex;align-items:center;justify-content:space-between;gap:18px}
.logo{display:inline-flex;align-items:center;gap:10px;color:var(--white);font-weight:800;font-size:1.2rem;letter-spacing:.1em;flex-shrink:0}
.logo-mark{width:40px;height:40px;border-radius:12px;background:linear-gradient(135deg,var(--accent),#ff9e57);display:inline-flex;align-items:center;justify-content:center;color:var(--white);font-size:.92rem;box-shadow:0 10px 22px rgba(232,113,43,0.28)}
.nav-actions{display:flex;align-items:center;gap:12px}
.lang-switch{display:inline-flex;align-items:center;border:1px solid rgba(255,255,255,0.2);border-radius:999px;overflow:hidden;background:rgba(255,255,255,0.06)}
.lang-btn{min-width:48px;height:34px;border:none;color:rgba(255,255,255,0.88);background:transparent;cursor:pointer;font-weight:700;transition:background var(--ease),color var(--ease);font-size:.82rem}
.lang-btn.active{background:var(--accent);color:var(--white)}
.menu-toggle{display:none;width:46px;height:46px;border:none;border-radius:12px;background:rgba(255,255,255,0.1);position:relative;cursor:pointer}
.menu-toggle span,.menu-toggle::before,.menu-toggle::after{content:"";position:absolute;left:12px;width:22px;height:2px;background:#fff;transition:transform var(--ease),top var(--ease),opacity var(--ease)}
.menu-toggle span{top:22px}
.menu-toggle::before{top:15px}
.menu-toggle::after{top:29px}
.nav-menu{list-style:none;display:flex;align-items:center;gap:8px}
.nav-menu a{min-height:42px;padding:0 14px;border-radius:999px;color:rgba(255,255,255,0.9);display:inline-flex;align-items:center;justify-content:center;font-weight:600;transition:background var(--ease),color var(--ease)}
.nav-menu a:hover,.nav-menu a.active{background:rgba(255,255,255,0.11);color:#fff}
.hero{min-height:70vh;position:relative;overflow:hidden;color:var(--white);background:linear-gradient(140deg,#0f2845,#2f3948);display:flex;align-items:center}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(92deg,rgba(8,22,40,0.88) 0%,rgba(8,22,40,0.65) 50%,rgba(8,22,40,0.3) 100%);z-index:1}
.hero .container{position:relative;z-index:2;padding:140px 0 80px}
.hero h1{font-size:clamp(2.4rem,5vw,3.8rem)}
.hero p{margin-top:16px;color:rgba(255,255,255,0.84);max-width:650px;font-size:1.1rem}
.hero-actions{margin-top:30px;display:flex;flex-wrap:wrap;gap:12px}
.breadcrumb{font-size:.88rem;color:rgba(255,255,255,0.6);margin-bottom:20px}
.breadcrumb a{color:rgba(255,255,255,0.6)}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb span{margin:0 8px}

/* Scenario cards */
.scenario-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}
.scenario-card{border-radius:22px;overflow:hidden;border:1px solid rgba(26,54,93,0.1);background:#fff;box-shadow:var(--shadow-soft);transition:transform var(--ease),box-shadow var(--ease)}
.scenario-card:hover{transform:translateY(-7px);box-shadow:var(--shadow-pop)}
.scenario-body{padding:24px 22px}
.scenario-icon{width:58px;height:58px;border-radius:16px;margin-bottom:15px;display:inline-flex;align-items:center;justify-content:center;font-size:1.6rem;background:linear-gradient(140deg,rgba(26,54,93,0.12),rgba(232,113,43,0.15))}
.scenario-body h3{color:var(--primary);margin-bottom:10px}
.scenario-body p{color:var(--muted);font-size:.93rem;margin-bottom:12px}
.scenario-body ul{list-style:none;padding:0}
.scenario-body li{font-size:.88rem;color:var(--ink);padding:5px 0;padding-left:18px;position:relative}
.scenario-body li::before{content:"";position:absolute;left:0;top:11px;width:7px;height:7px;border-radius:50%;background:var(--accent)}

/* Benefits grid */
.benefits-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}
.benefit-card{border-radius:20px;border:1px solid rgba(26,54,93,0.1);background:#fff;box-shadow:var(--shadow-soft);padding:24px 20px;transition:transform var(--ease),box-shadow var(--ease)}
.benefit-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-pop)}
.benefit-icon{width:58px;height:58px;border-radius:16px;margin-bottom:15px;display:inline-flex;align-items:center;justify-content:center;color:var(--primary);background:linear-gradient(140deg,rgba(26,54,93,0.12),rgba(232,113,43,0.15));font-size:1.6rem}

/* Workflow */
.workflow-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-top:8px}
.step{padding:20px 18px;border-radius:18px;border:1px solid rgba(26,54,93,0.1);background:#fff;box-shadow:var(--shadow-soft)}
.step-num{width:34px;height:34px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;color:#fff;background:var(--accent);font-weight:700;margin-bottom:10px}

/* Contact */
.contact-wrap{display:grid;grid-template-columns:minmax(0,760px);justify-content:center}
.panel{border-radius:22px;border:1px solid rgba(26,54,93,0.1);background:#fff;box-shadow:var(--shadow-soft);padding:36px 30px}
.contact-main-header{margin-bottom:24px}
.contact-main-header h3{font-size:1.5rem;color:var(--primary);margin-bottom:8px}
.contact-main-header p{color:var(--muted);font-size:.95rem;line-height:1.7}
.contact-benefits{list-style:none;margin:18px 0 28px;display:grid;gap:10px}
.contact-benefits li{padding:6px 0;font-size:.93rem;color:var(--ink);padding-left:28px;position:relative;border:none;background:transparent}
.contact-benefits li::before{content:"";position:absolute;left:0;top:12px;width:14px;height:14px;background:rgba(37,211,102,0.1);border:1.5px solid #25d366;border-radius:4px}
.contact-benefits li::after{content:"";position:absolute;left:4px;top:13px;transform:rotate(45deg);width:4px;height:7px;border-right:2px solid #25d366;border-bottom:2px solid #25d366}
.contact-primary{margin-bottom:20px}
.contact-primary a{display:flex;align-items:center;justify-content:center;gap:10px;min-height:58px;border-radius:16px;font-weight:700;font-size:1.08rem;background:linear-gradient(135deg,#25d366,#128c7e);color:#fff;box-shadow:0 10px 28px rgba(37,211,102,0.3);text-decoration:none;transition:transform var(--ease),box-shadow var(--ease)}
.contact-primary a:hover{transform:translateY(-2px);box-shadow:0 14px 36px rgba(37,211,102,0.4);color:#fff}
.contact-primary-note{margin-top:8px;text-align:center;font-size:.82rem;color:var(--muted)}
.contact-secondary{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:14px}
.contact-secondary a{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;border-radius:12px;padding:0 18px;font-weight:700;font-size:.9rem;border:1px solid var(--line);background:#fff;color:var(--primary);text-decoration:none;cursor:pointer;transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease)}
.contact-secondary a:hover{transform:translateY(-2px);border-color:rgba(26,54,93,0.25);box-shadow:var(--shadow-soft);color:var(--primary)}
.contact-secondary a.telegram{border-color:rgba(45,147,224,0.35);color:#1474b7;background:rgba(45,147,224,0.06)}
.contact-secondary a.email{border-color:rgba(232,113,43,0.35);color:var(--accent-2);background:rgba(232,113,43,0.06)}
.contact-secondary a.wechat{border-color:rgba(48,186,73,0.35);color:#0e8d2b;background:rgba(48,186,73,0.06)}
.contact-inline-link{margin-bottom:14px;font-size:.88rem;color:var(--muted)}
.contact-inline-link a{color:var(--accent);font-weight:700}
.contact-tip{margin-top:18px;padding:12px 14px;border-radius:12px;background:#fff;border-left:3px solid rgba(232,113,43,0.6);box-shadow:var(--shadow-soft)}
.contact-tip p{font-size:.84rem;color:var(--primary);line-height:1.6;margin:0}
.qr-modal{position:fixed;inset:0;z-index:2000;display:none;align-items:center;justify-content:center;padding:24px;background:rgba(9,23,38,0.78);backdrop-filter:blur(10px)}
.qr-modal.active{display:flex}
.qr-modal-inner{width:min(100%,360px);background:rgba(255,255,255,0.98);border:1px solid rgba(26,54,93,0.08);border-radius:24px;box-shadow:0 24px 64px rgba(8,22,40,0.28);padding:24px 24px 22px;position:relative;text-align:center}
.qr-close{position:absolute;top:14px;right:14px;width:38px;height:38px;border:none;border-radius:50%;background:#eef4fa;color:var(--primary);font-size:1.4rem;line-height:1;cursor:pointer}
.qr-modal-badge{display:inline-flex;align-items:center;justify-content:center;min-height:30px;padding:0 12px;border-radius:999px;background:rgba(48,186,73,0.12);color:#129935;font-size:.78rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase}
.qr-modal h3{margin:16px 0 8px;color:var(--primary);font-size:1.35rem}
.qr-modal p{color:var(--muted);font-size:.92rem;line-height:1.6}
.qr-image-wrap{margin:18px auto 14px;padding:12px;width:fit-content;border-radius:20px;background:linear-gradient(180deg,#f8fcff 0%,#eff7f1 100%);border:1px solid rgba(26,54,93,0.08)}
.qr-image-wrap img{width:min(100%,240px);border-radius:14px}
.qr-manual{margin-top:12px;padding-top:12px;border-top:1px solid var(--line);font-size:.84rem;color:var(--muted)}

/* FAQ */
.faq-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.faq{border-radius:16px;border:1px solid rgba(26,54,93,0.1);background:#fff;box-shadow:var(--shadow-soft);padding:18px}
.faq h3{margin-bottom:8px;color:var(--primary);font-size:1.04rem}
.faq p{font-size:.9rem;color:var(--muted);line-height:1.6}

/* Footer */
.site-footer{background:var(--primary);color:rgba(255,255,255,0.9)}
.footer-main{padding:48px 16px 32px}
.footer-grid{display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:32px;max-width:var(--container);margin:0 auto}
.footer-brand .logo{margin-bottom:12px}
.footer-brand p{font-size:.9rem;color:rgba(255,255,255,0.7);max-width:260px;line-height:1.6}
.footer-col h4{color:#fff;font-size:.95rem;margin-bottom:14px;text-transform:uppercase;letter-spacing:.06em}
.footer-col ul{list-style:none}
.footer-col ul li{margin-bottom:8px}
.footer-col ul li a{color:rgba(255,255,255,0.75);font-size:.9rem;transition:color var(--ease)}
.footer-col ul li a:hover{color:var(--accent)}
.footer-bottom{border-top:1px solid rgba(255,255,255,0.1);padding:20px 16px;text-align:center;font-size:.85rem;color:rgba(255,255,255,0.6)}

/* Float chat */
.float-chat{position:fixed;right:16px;bottom:16px;z-index:999;display:grid;gap:8px}
.float-chat a{width:52px;height:52px;border:none;border-radius:16px;display:inline-flex;align-items:center;justify-content:center;color:#fff;cursor:pointer;box-shadow:var(--shadow-pop);font-size:.86rem;font-weight:700;transition:transform var(--ease),filter var(--ease)}
.float-chat a:hover{transform:translateY(-2px);filter:brightness(0.96)}
.float-whatsapp{background:#1fb15d}
.float-telegram{background:#238fd8}
.float-email{background:var(--accent)}

/* Reveal animation */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease}
.reveal.visible{opacity:1;transform:translateY(0)}

/* Fact block */
.fact-block{max-width:1100px;margin:0 auto;padding:0 24px 30px}
.fact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}
.fact-item{background:#f5f9fd;border-radius:12px;padding:16px;border:1px solid rgba(26,54,93,0.08)}
.fact-item strong{color:var(--primary);font-size:.85rem;display:block;margin-bottom:6px}
.fact-item span{color:var(--ink);font-size:.82rem}

/* Responsive */
@media(max-width:1100px){.hero .container{padding-top:120px}.scenario-grid{grid-template-columns:1fr}.benefits-grid,.workflow-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.faq-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:820px){:root{--nav-h:72px}.menu-toggle{display:inline-flex}.nav-menu{position:absolute;top:calc(100% + 10px);left:20px;right:20px;flex-direction:column;align-items:stretch;gap:6px;border-radius:18px;background:rgba(17,40,70,0.97);border:1px solid rgba(255,255,255,0.1);box-shadow:var(--shadow-pop);padding:12px;opacity:0;transform:translateY(-8px);pointer-events:none;transition:opacity var(--ease),transform var(--ease)}.nav-menu.open{opacity:1;transform:translateY(0);pointer-events:auto}.nav-menu a{justify-content:flex-start}.benefits-grid,.workflow-grid{grid-template-columns:1fr}.section{padding:74px 0}.panel{padding:24px 20px}.scenario-grid{grid-template-columns:1fr}}
@media(max-width:560px){.container{width:min(calc(100% - 28px),var(--container))}h1{font-size:2.24rem}h2{font-size:1.82rem}.hero-actions{flex-direction:column}.btn{width:100%}.faq-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.contact-secondary{flex-direction:column}.contact-secondary a{width:100%}}

.crumbs { max-width: 1180px; margin: 0 auto; padding: 14px 24px 0; font-size: 0.82rem; color: var(--muted, #64748b); }
.crumbs a { color: inherit; text-decoration: none; }
.crumbs a:hover { text-decoration: underline; }
.crumbs span.sep { opacity: .55; margin: 0 6px; }
.crumbs strong { font-weight: 600; color: var(--ink, #0f172a); }


/* brand mark: use the real QIFAN logo in the header */
.logo-mark{
  width:34px;height:34px;border-radius:9px;
  background-color:#000;
  background-image:url('/assets/brand-mark-128.webp');
  background-position:center;
  background-size:cover;
  background-repeat:no-repeat;
  color:transparent;font-size:0;line-height:0;overflow:hidden;
  box-shadow:0 0 0 1.5px rgba(255,255,255,.30), 0 2px 8px rgba(0,0,0,.45);
  flex:0 0 auto;
}

/* phones: floating contact buttons covered the hero CTA */
@media (max-width: 640px) {
  .float-chat { display: none !important; }
}


/* anchors must clear the fixed header */
:target { scroll-margin-top: 92px; }
#epc-index, #contact, #faq, #quote { scroll-margin-top: 92px; }