*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --ink:#1d1d1f;
  --paper:#ffffff;
  --grey:#f5f5f7;
  --muted:#6e6e73;
  --border:#d2d2d7;
  --red:#e8320a;
  --ease:cubic-bezier(0.25,0.1,0.25,1);
}
html{overflow-x:hidden}
body{background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,'SF Pro Display','Inter','PingFang SC','Microsoft YaHei',sans-serif;font-size:16px;line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased}

/* ── NAV ── */
nav{
  position:fixed;top:0;left:0;right:0;z-index:200;
  display:flex;justify-content:space-between;align-items:center;
  padding:0 3rem;height:52px;
  background:rgba(255,255,255,0);
  transition:background 0.5s,border-color 0.5s;
  border-bottom:1px solid transparent;
}
nav.scrolled{background:rgba(255,255,255,0.8);backdrop-filter:blur(20px) saturate(180%);-webkit-backdrop-filter:blur(20px) saturate(180%);border-bottom-color:rgba(0,0,0,0.06)}
.nav-logo{font-size:1rem;font-weight:600;letter-spacing:-0.02em;color:var(--ink)}
.nav-logo em{font-style:normal;color:var(--red)}
.nav-links{display:flex;gap:2.5rem;align-items:center}
.nav-links a{font-size:0.8rem;font-weight:400;color:var(--muted);text-decoration:none;transition:color 0.2s;letter-spacing:0.01em}
.nav-links a:hover{color:var(--ink)}
.nav-btn{background:var(--ink)!important;color:#fff!important;padding:0.42rem 1.1rem;border-radius:20px;font-size:0.78rem!important;font-weight:500!important;text-decoration:none;transition:background 0.2s,transform 0.15s!important;display:inline-flex!important;align-items:center;gap:0.4rem}
.icon{width:1em;height:1em;flex-shrink:0}
.nav-btn:hover{background:var(--red)!important;transform:translateY(-1px)!important}
.lang-switch{display:flex;border:1px solid var(--border);border-radius:20px;overflow:hidden}
.lang-switch button{background:none;border:none;padding:0.38rem 0.75rem;font-size:0.75rem;font-weight:500;color:var(--muted);cursor:pointer;font-family:inherit;transition:background 0.2s,color 0.2s}
.lang-switch button.active{background:var(--ink);color:#fff}
.lang-switch button:not(.active):hover{color:var(--ink)}

.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;width:32px;height:32px;background:none;border:none;cursor:pointer;padding:0}
.nav-toggle span{display:block;width:20px;height:2px;background:var(--ink);border-radius:2px;transition:transform 0.25s var(--ease),opacity 0.2s var(--ease)}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.mobile-menu{
  position:fixed;top:52px;left:0;right:0;z-index:199;
  background:rgba(255,255,255,0.98);backdrop-filter:blur(20px) saturate(180%);-webkit-backdrop-filter:blur(20px) saturate(180%);
  border-bottom:1px solid var(--border);
  display:flex;flex-direction:column;padding:0 1.25rem;
  max-height:0;overflow:hidden;
  transition:max-height 0.35s var(--ease);
}
.mobile-menu.open{max-height:320px;padding:0.5rem 1.25rem}
.mobile-menu a{padding:0.9rem 0;font-size:0.95rem;font-weight:500;color:var(--ink);text-decoration:none;border-bottom:1px solid var(--border)}
.mobile-menu a:last-child{border-bottom:none}
@media(min-width:601px){.mobile-menu{display:none}}

/* ── HERO ── */
.hero{
  height:100vh;min-height:600px;max-height:900px;
  display:flex;flex-direction:column;
  justify-content:center;align-items:center;text-align:center;
  padding:5rem 2rem 2.5rem;position:relative;overflow:hidden;
}

.hero-badge{
  display:inline-flex;align-items:center;
  color:var(--muted);font-size:0.8rem;font-weight:500;
  margin-bottom:1.6rem;letter-spacing:0.01em;
  animation:fadeUp 0.8s var(--ease) both;
}

.hero h1{
  font-size:clamp(2.4rem,6vw,5.2rem);font-weight:600;
  line-height:1.05;letter-spacing:-0.03em;
  max-width:820px;margin-bottom:1.4rem;
  animation:fadeUp 0.8s 0.1s var(--ease) both;
}
.hero h1 .red{color:var(--red)}
@keyframes fadeUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}

.hero-sub{
  font-size:clamp(0.95rem,1.4vw,1.15rem);color:var(--muted);
  max-width:480px;line-height:1.6;margin-bottom:2.2rem;
  font-weight:400;animation:fadeUp 0.8s 0.2s var(--ease) both;
}
.hero-cta{
  display:flex;gap:0.85rem;justify-content:center;flex-wrap:wrap;
  margin-bottom:3rem;animation:fadeUp 0.8s 0.3s var(--ease) both;
}
.btn-main{
  display:inline-flex;align-items:center;gap:0.5rem;
  background:var(--red);color:#fff;font-size:0.9rem;font-weight:500;
  padding:0.7rem 1.6rem;border-radius:100px;text-decoration:none;
  transition:background 0.2s var(--ease),transform 0.2s var(--ease);
}
.btn-main:hover{background:#c92a08;transform:translateY(-1px);text-decoration:none}
.btn-outline{
  display:inline-flex;align-items:center;gap:0.4rem;
  background:transparent;color:var(--ink);font-size:0.9rem;font-weight:500;
  padding:0.7rem 1.5rem;border-radius:100px;border:1px solid var(--border);
  text-decoration:none;transition:border-color 0.2s,transform 0.2s;
}
.btn-outline:hover{border-color:var(--ink);transform:translateY(-1px);text-decoration:none}

/* ── NUMBERS ── */
.numbers{
  display:grid;grid-template-columns:repeat(4,1fr);
  border-top:1px solid var(--border);border-bottom:1px solid var(--border);
  background:#fff;position:relative;z-index:1;
}
.num-item{
  padding:3.2rem 2rem;text-align:center;
  border-right:1px solid var(--border);
  cursor:default;
}
.num-item:last-child{border-right:none}
.num-big{
  font-size:2.8rem;font-weight:600;letter-spacing:-0.03em;
  color:var(--ink);line-height:1;margin-bottom:0.5rem;
}
.num-big span{color:var(--red)}
.num-label{font-size:0.82rem;color:var(--muted);font-weight:400;line-height:1.4}

/* ── MARQUEE ── */
.marquee-wrap{background:var(--grey);padding:1rem 0;overflow:hidden;position:relative;z-index:1}
.marquee-track{display:flex;gap:0;white-space:nowrap;animation:marquee 35s linear infinite}
.marquee-item{
  font-size:0.8rem;font-weight:500;color:var(--muted);
  letter-spacing:0.03em;
  display:inline-flex;align-items:center;padding:0 2.5rem;
  flex-shrink:0;cursor:default;
}
.marquee-item .dot{color:var(--border);margin-left:2.5rem;font-size:0.5rem}
@keyframes marquee{from{transform:translateX(0)}to{transform:translateX(-50%)}}

/* ── SECTION BASE ── */
.section-wrap{max-width:1080px;margin:0 auto;padding:8rem 2rem}
.eyebrow{font-size:0.82rem;font-weight:500;letter-spacing:0.02em;color:var(--red);margin-bottom:0.85rem}
.section-h{font-size:clamp(2rem,4vw,3rem);font-weight:600;letter-spacing:-0.03em;line-height:1.12;margin-bottom:3.5rem}
.section-h em{font-style:normal;color:var(--red)}

/* ── REVEAL ANIMATION ── */
.reveal{opacity:0;transform:translateY(32px);transition:opacity 0.7s ease,transform 0.7s ease}
.reveal.visible{opacity:1;transform:translateY(0)}
.reveal-delay-1{transition-delay:0.1s}
.reveal-delay-2{transition-delay:0.2s}
.reveal-delay-3{transition-delay:0.3s}
.reveal-delay-4{transition-delay:0.4s}
.reveal-delay-5{transition-delay:0.5s}
.reveal-delay-6{transition-delay:0.6s}

/* ── SERVICES ── */
.services-bg{background:#fff;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.svc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem}
.svc-card{
  background:var(--grey);padding:2rem 1.75rem;border-radius:18px;
  display:flex;flex-direction:column;gap:0;
  cursor:default;min-height:230px;
  transition:transform 0.3s var(--ease),box-shadow 0.3s var(--ease);
}
.svc-card:hover{transform:translateY(-4px);box-shadow:0 12px 32px rgba(0,0,0,0.08)}
.svc-card-inner{height:100%;display:flex;flex-direction:column}
.svc-icon-box{
  width:42px;height:42px;border-radius:10px;
  background:#fff;
  display:flex;align-items:center;justify-content:center;
  font-size:1.15rem;margin-bottom:1.2rem;flex-shrink:0;
}
.svc-num-tag{
  font-size:0.7rem;font-weight:500;color:var(--muted);
  letter-spacing:0.04em;
  margin-bottom:0.5rem;display:block;
}
.svc-title{
  font-size:0.95rem;font-weight:600;letter-spacing:-0.01em;
  line-height:1.3;margin-bottom:0.6rem;
}
.svc-body{
  font-size:0.82rem;color:var(--muted);line-height:1.6;
}
.svc-tags{
  display:flex;flex-wrap:wrap;gap:0.4rem;margin-top:auto;padding-top:1.25rem;
}
.svc-tag{
  background:#fff;
  color:var(--muted);font-size:0.7rem;font-weight:500;
  padding:0.22rem 0.6rem;border-radius:6px;
}

@media(max-width:900px){.svc-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:500px){.svc-grid{grid-template-columns:1fr}}

/* ── PROCESS ── */
.process-bg{background:var(--grey)}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:2rem;margin-top:3.5rem;position:relative}
.step{position:relative;z-index:1}
.step-num{
  width:40px;height:40px;border-radius:50%;
  background:var(--ink);color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-size:0.78rem;font-weight:600;
  margin-bottom:1.4rem;
  cursor:default;
}
.step-title{font-size:1rem;font-weight:600;letter-spacing:-0.01em;margin-bottom:0.5rem}
.step-desc{font-size:0.85rem;color:var(--muted);line-height:1.6}

/* ── PROJECTS ── */
.proj-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.25rem}
.proj{
  border:1px solid var(--border);border-radius:16px;padding:1.75rem;
  background:#fff;
  transition:transform 0.25s var(--ease),box-shadow 0.25s var(--ease),border-color 0.2s;
  display:flex;flex-direction:column;gap:0.7rem;cursor:default;
}
.proj:hover{transform:translateY(-4px);box-shadow:0 12px 32px rgba(0,0,0,0.07);border-color:#bbb}
.proj-top{display:flex;align-items:center;justify-content:space-between}
.proj-cat{font-size:0.72rem;font-weight:500;color:var(--muted);letter-spacing:0.02em}
.proj-arrow{
  width:28px;height:28px;border-radius:50%;
  border:1px solid var(--border);display:flex;align-items:center;justify-content:center;
  font-size:0.75rem;color:var(--muted);
  transition:background 0.2s,border-color 0.2s,color 0.2s,transform 0.2s;
}
.proj:hover .proj-arrow{background:var(--red);border-color:var(--red);color:#fff;transform:rotate(45deg)}
.proj-name{font-size:1.05rem;font-weight:600;letter-spacing:-0.01em;line-height:1.3}
.proj-desc{font-size:0.85rem;color:var(--muted);line-height:1.6;flex:1}
.proj-chips{display:flex;flex-wrap:wrap;gap:0.35rem}
.proj-chip{background:var(--grey);color:var(--muted);font-size:0.72rem;font-weight:500;padding:0.2rem 0.55rem;border-radius:6px}

/* ── WHY ── */
.why-bg{background:var(--ink);color:#fff}
.why-bg .eyebrow{color:#ff6b52}
.why-bg .section-h{color:#fff}
.why-inner{display:grid;grid-template-columns:1fr 1fr;gap:6rem;align-items:start}
.why-intro{font-size:0.95rem;color:rgba(255,255,255,0.5);line-height:1.7;margin-top:1.5rem}
.why-list{display:flex;flex-direction:column;gap:0;border:1px solid rgba(255,255,255,0.1);border-radius:16px;overflow:hidden}
.why-item{
  padding:1.5rem 1.75rem;border-bottom:1px solid rgba(255,255,255,0.08);
  display:flex;gap:1.25rem;align-items:flex-start;
  cursor:default;
}
.why-item:last-child{border-bottom:none}
.why-num{
  font-size:0.7rem;font-weight:600;color:rgba(255,255,255,0.5);
  padding:0.2rem 0.5rem;
  flex-shrink:0;margin-top:1px;
}
.why-item-title{font-size:0.92rem;font-weight:600;color:#fff;margin-bottom:0.35rem;letter-spacing:-0.01em}
.why-item-desc{font-size:0.82rem;color:rgba(255,255,255,0.45);line-height:1.6}

/* ── CTA ── */
.cta-section{padding:9rem 2rem;text-align:center}
.cta-section h2{
  font-size:clamp(2.5rem,6vw,4.5rem);font-weight:600;
  letter-spacing:-0.03em;line-height:1.1;
  max-width:700px;margin:0 auto 1.2rem;
}
.cta-section h2 em{font-style:normal;color:var(--red)}
.cta-section p{font-size:1.05rem;color:var(--muted);margin-bottom:3rem}
.cta-actions{display:flex;gap:0.85rem;justify-content:center;flex-wrap:wrap}
.btn-wa{
  display:inline-flex;align-items:center;gap:0.6rem;
  background:var(--red);color:#fff;font-size:1rem;font-weight:600;
  padding:1rem 2.4rem;border-radius:100px;text-decoration:none;
  transition:background 0.2s var(--ease),transform 0.2s var(--ease);
}
.btn-wa:hover{background:#c92a08;transform:translateY(-2px);text-decoration:none}
.btn-email{
  display:inline-flex;align-items:center;gap:0.6rem;
  background:transparent;color:var(--ink);font-size:1rem;font-weight:600;
  padding:1rem 2.4rem;border-radius:100px;border:1px solid var(--border);
  text-decoration:none;transition:border-color 0.2s var(--ease),transform 0.2s var(--ease);
}
.btn-email:hover{border-color:var(--ink);transform:translateY(-2px);text-decoration:none}
.cta-note{font-size:0.82rem;color:var(--muted);margin-top:1.6rem}

/* ── FOOTER ── */
footer{
  border-top:1px solid var(--border);padding:1.6rem 3rem;
  display:flex;justify-content:space-between;align-items:center;
  flex-wrap:wrap;gap:1rem;font-size:0.8rem;color:var(--muted);
}
.footer-logo{font-size:0.95rem;font-weight:600;letter-spacing:-0.02em;color:var(--ink)}
.footer-logo em{font-style:normal;color:var(--red)}
.footer-links{display:flex;gap:1.5rem}
.footer-links a{color:var(--muted);text-decoration:none;transition:color 0.2s}
.footer-links a:hover{color:var(--ink)}

/* ── RESPONSIVE ── */
@media(max-width:900px){
  nav{padding:0 1.5rem}
  .nav-links{gap:1.25rem}
  .nav-logo{font-size:0.92rem}
  .section-wrap{padding:6rem 2rem}
  .svc-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:1fr 1fr;gap:2rem}
  .why-inner{grid-template-columns:1fr;gap:3rem}
  .numbers{grid-template-columns:repeat(2,1fr)}
  .num-item:nth-child(2){border-right:none}
  .num-item:nth-child(3){border-top:1px solid var(--border)}
  .about-grid{gap:3rem!important}
}
@media(max-width:600px){
  nav{padding:0 1.25rem}
  .nav-links{gap:0.5rem}
  .nav-links a:not(.nav-btn){display:none}
  .nav-btn{padding:0.6rem 1rem!important}
  .nav-btn span{display:none}
  .lang-switch button{padding:0.34rem 0.55rem;font-size:0.7rem}
  .nav-toggle{display:flex}
  .hero{height:100svh;min-height:560px;padding:4rem 1.25rem 2rem}
  .hero h1{font-size:2.4rem;letter-spacing:-0.02em}
  .hero-sub{max-width:340px}
  .hero-cta{width:100%}
  .hero-cta a{flex:1;justify-content:center}
  .section-wrap{padding:4.5rem 1.25rem}
  .section-h{margin-bottom:2.5rem}
  .svc-grid{grid-template-columns:1fr}
  .svc-card{min-height:0}
  .steps{grid-template-columns:1fr;gap:2rem}
  .numbers{grid-template-columns:1fr 1fr}
  .num-item{padding:2rem 1rem}
  .num-big{font-size:2.2rem}
  .proj-grid{grid-template-columns:1fr}
  .cta-section{padding:5rem 1.25rem}
  .cta-actions{width:100%;flex-direction:column}
  .btn-wa,.btn-email{width:100%;justify-content:center;padding:1rem 1.5rem}
  footer{padding:1.5rem 1.25rem;flex-direction:column;text-align:center}
  .footer-links{gap:1.25rem;flex-wrap:wrap;justify-content:center}
  .about-grid{grid-template-columns:1fr!important}
}
@media(max-width:380px){
  .hero h1{font-size:2rem}
  .numbers{grid-template-columns:1fr}
  .num-item{border-right:none!important;border-bottom:1px solid var(--border)}
  .num-item:last-child{border-bottom:none}
}

/* ── BREADCRUMB ── */
.breadcrumb{max-width:1080px;margin:0 auto;padding:5.5rem 2rem 0;font-size:0.82rem;color:var(--muted)}
.breadcrumb a{color:var(--muted);text-decoration:none}
.breadcrumb a:hover{color:var(--ink)}
.breadcrumb span{margin:0 0.4rem}

/* ── SERVICE HERO ── */
.service-hero{max-width:1080px;margin:0 auto;padding:2rem 2rem 4rem}
.service-hero h1{font-size:clamp(2rem,5vw,3.4rem);font-weight:600;letter-spacing:-0.03em;line-height:1.1;margin-bottom:1.2rem;max-width:760px}
.service-hero h1 em{font-style:normal;color:var(--red)}
.service-hero p{font-size:1.05rem;color:var(--muted);max-width:620px;line-height:1.7;margin-bottom:2rem}

/* ── PROBLEM GRID ── */
.problem-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1.25rem;margin-top:2.5rem}
.problem-card{background:var(--grey);border-radius:16px;padding:1.75rem;display:flex;gap:1rem;align-items:flex-start}
.problem-card .icon-box{font-size:1.3rem;flex-shrink:0}
.problem-card h3{font-size:0.95rem;font-weight:600;margin-bottom:0.4rem;letter-spacing:-0.01em}
.problem-card p{font-size:0.85rem;color:var(--muted);line-height:1.6}
@media(max-width:700px){.problem-grid{grid-template-columns:1fr}}

/* ── TECH BADGES ── */
.tech-grid{display:flex;flex-wrap:wrap;gap:0.6rem;margin-top:2.5rem}
.tech-badge{background:var(--grey);border:1px solid var(--border);color:var(--ink);font-size:0.85rem;font-weight:500;padding:0.5rem 1rem;border-radius:100px}

/* ── FAQ ── */
.faq-list{display:flex;flex-direction:column;gap:0;margin-top:2.5rem;border:1px solid var(--border);border-radius:16px;overflow:hidden}
.faq-item{border-bottom:1px solid var(--border)}
.faq-item:last-child{border-bottom:none}
.faq-item summary{padding:1.5rem 1.75rem;font-size:0.95rem;font-weight:600;letter-spacing:-0.01em;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:1rem}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:'+';font-size:1.3rem;font-weight:400;color:var(--muted);flex-shrink:0;transition:transform 0.2s}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item p{padding:0 1.75rem 1.5rem;font-size:0.88rem;color:var(--muted);line-height:1.7}

/* ── CONTACT FORM ── */
.contact-form{max-width:560px;margin-top:2.5rem;display:flex;flex-direction:column;gap:1rem}
.contact-form label{font-size:0.82rem;font-weight:500;color:var(--ink);margin-bottom:0.35rem;display:block}
.contact-form input,.contact-form textarea{width:100%;padding:0.8rem 1rem;border:1px solid var(--border);border-radius:10px;font-family:inherit;font-size:0.9rem;color:var(--ink);background:#fff;transition:border-color 0.2s}
.contact-form input:focus,.contact-form textarea:focus{outline:none;border-color:var(--red)}
.contact-form textarea{resize:vertical;min-height:120px}
.contact-form button{align-self:flex-start;background:var(--red);color:#fff;border:none;font-size:0.9rem;font-weight:600;padding:0.85rem 2rem;border-radius:100px;cursor:pointer;transition:background 0.2s,transform 0.2s}
.contact-form button:hover{background:#c92a08;transform:translateY(-1px)}
.form-note{font-size:0.78rem;color:var(--muted);margin-top:0.5rem}
.form-success{display:none;background:var(--grey);border-radius:12px;padding:1.5rem;font-size:0.9rem;color:var(--ink);margin-top:1.5rem}