/* =========================================================
   PK TECHNOLOGY — landing page styles
   Palette: #1F4FE0 (accent blue), #14171A (ink/dark), #F7F8FA (paper),
            #16191D (text), #5A6470 (muted text)
   Type: Montserrat (display + body)
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Montserrat:ital,wght@0,400;0,500;0,600;0,700;0,800;1,400&display=swap');

:root{
  --accent:#1F4FE0;
  --accent-dark:#1A40B8;
  --ink:#14171A;
  --paper:#F7F8FA;
  --text:#16191D;
  --muted:#5A6470;
  --line:#E4E7EC;
  --line-soft:#E9ECF1;
  --radius:14px;
  --container:1280px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--text);
  font-family:'Montserrat',-apple-system,BlinkMacSystemFont,sans-serif;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:inherit;}
button{font-family:inherit;}
::selection{background:var(--accent);color:#fff;}

.container{max-width:var(--container);margin:0 auto;padding:0 clamp(20px,5vw,56px);}

.eyebrow{
  display:flex;align-items:center;gap:12px;margin-bottom:18px;
  font-size:13px;font-weight:600;letter-spacing:0.22em;text-transform:uppercase;
  color:var(--accent);
}
.eyebrow.on-dark{color:#9FB4FF;}
.eyebrow.on-hero{color:#f7f8fa;}
.eyebrow-bar{width:30px;height:2px;background:var(--accent);flex-shrink:0;}
.eyebrow.on-hero .eyebrow-bar{background:var(--accent);}

/* ============ HEADER ============ */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:76px;display:flex;align-items:center;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background .4s ease, box-shadow .4s ease, border-color .4s ease;
}
.site-header.solid{
  background:rgba(247,248,250,0.86);
  backdrop-filter:blur(18px) saturate(160%);
  -webkit-backdrop-filter:blur(18px) saturate(160%);
  border-bottom:1px solid rgba(20,23,28,0.08);
  box-shadow:0 6px 28px rgba(20,23,28,0.07);
}
.site-header .container{display:flex;align-items:center;justify-content:space-between;gap:24px;height:100%;}

.logo{display:flex;align-items:center;gap:11px;text-decoration:none;flex-shrink:0;}
.logo-dot{width:13px;height:13px;background:var(--accent);border-radius:3px;flex-shrink:0;}
.logo-text{font-weight:800;font-size:18px;letter-spacing:0.04em;color:#fff;transition:color .4s ease;white-space:nowrap;}
.site-header.solid .logo-text{color:var(--text);}

.header-nav{display:flex;align-items:center;gap:30px;margin:0 auto;padding:0 24px;}
.header-nav a{
  text-decoration:none;font-size:15px;font-weight:500;letter-spacing:0.01em;
  color:#fff;opacity:0.92;transition:color .25s ease,opacity .25s ease;
}
.site-header.solid .header-nav a{color:var(--text);}
.header-nav a:hover{color:var(--accent);opacity:1;}

.header-right{display:flex;align-items:center;gap:10px;}

.lang-switch{
  display:flex;align-items:center;gap:2px;padding:3px;border-radius:9px;
  border:1px solid rgba(255,255,255,0.30);background:rgba(255,255,255,0.10);
  transition:border-color .4s ease,background .4s ease;
}
.site-header.solid .lang-switch{border-color:rgba(20,23,28,0.14);background:rgba(20,23,28,0.04);}
.lang-switch button{
  appearance:none;border:none;cursor:pointer;background:transparent;
  color:#fff;font-size:12px;font-weight:700;letter-spacing:0.03em;
  padding:6px 10px;border-radius:6px;transition:background .2s ease,color .2s ease;
}
.site-header.solid .lang-switch button{color:var(--text);}
.lang-switch button.active{background:var(--accent);color:#fff;}

.icon-btn{
  width:42px;height:42px;border-radius:11px;
  display:flex;align-items:center;justify-content:center;
  text-decoration:none;color:#fff;
  border:1px solid rgba(255,255,255,0.30);background:rgba(255,255,255,0.10);
  transition:background .25s ease,color .25s ease,border-color .25s ease,transform .25s ease;
}
.site-header.solid .icon-btn{color:var(--text);border-color:rgba(20,23,28,0.14);background:rgba(20,23,28,0.04);}
.icon-btn:hover{background:var(--accent);border-color:var(--accent);color:#fff;transform:translateY(-2px);}

.header-cta{
  appearance:none;border:none;cursor:pointer;text-decoration:none;
  background:var(--accent);color:#fff;font-weight:600;font-size:14px;
  padding:11px 22px;border-radius:10px;white-space:nowrap;
  box-shadow:0 6px 18px rgba(31,79,224,0.28);
  display:inline-flex;align-items:center;
  transition:background .25s ease, transform .25s ease;
}
.header-cta:hover{background:var(--accent-dark);transform:translateY(-1px);}

.burger{
  appearance:none;background:none;border:none;cursor:pointer;
  width:40px;height:40px;display:none;flex-direction:column;
  align-items:center;justify-content:center;gap:5px;padding:0;
}
.burger span{display:block;width:22px;height:2px;border-radius:2px;background:#fff;transition:transform .3s ease,opacity .25s ease,background .4s ease;}
.site-header.solid .burger span{background:var(--text);}
.burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.burger.open span:nth-child(2){opacity:0;}
.burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

.mobile-nav{
  position:fixed;top:62px;left:0;right:0;z-index:99;
  background:rgba(247,248,250,0.98);backdrop-filter:blur(18px);
  border-bottom:1px solid rgba(20,23,28,0.08);
  box-shadow:0 12px 28px rgba(20,23,28,0.10);
  padding:18px clamp(20px,5vw,56px) 26px;
  display:none;flex-direction:column;gap:4px;
  animation:pkMenuIn .25s ease both;
}
.mobile-nav.open{display:flex;}
.mobile-nav a{
  text-decoration:none;color:var(--text);font-size:16px;font-weight:600;
  padding:12px 4px;border-bottom:1px solid var(--line);
}
.mobile-nav .mobile-contact-row{display:flex;gap:10px;margin-top:14px;}

@keyframes pkMenuIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}

@media (max-width:900px){
  .header-nav{display:none;}
  .burger{display:flex;}
  .header-right .lang-switch{display:flex;}
  .header-right .icon-btn{display:none;}
  .site-header{height:62px;}
  .logo-text{font-size:16px;}
}

/* ============ HERO ============ */
.hero{
  position:relative;min-height:clamp(560px,94vh,940px);
  display:flex;align-items:flex-end;overflow:hidden;
  background:
    radial-gradient(circle at 18% 20%, rgba(31,79,224,0.35), transparent 45%),
    radial-gradient(circle at 82% 78%, rgba(31,79,224,0.22), transparent 50%),
    linear-gradient(160deg,#14171A 0%,#1A1E23 55%,#101215 100%);
}
.hero-image{position:absolute;inset:0;z-index:0;overflow:hidden;background:#14171A;}
.hero-image img{width:100%;height:100%;object-fit:cover;object-position:center 38%;}
.hero-overlay{
  position:absolute;inset:0;z-index:1;
  background:linear-gradient(180deg,rgba(20,23,26,0.35) 0%,rgba(20,23,26,0.10) 38%,rgba(20,23,26,0.85) 100%);
}
.hero-inner{position:relative;z-index:2;width:100%;max-width:var(--container);margin:0 auto;padding:0 clamp(20px,5vw,56px) clamp(56px,9vh,104px);}
.hero h1{
  margin:0;color:#fff;font-weight:700;font-size:clamp(38px,6.2vw,80px);
  line-height:1.03;letter-spacing:-0.025em;max-width:16ch;
}
.hero p{
  margin:26px 0 0;color:rgba(255,255,255,0.84);font-size:clamp(16px,1.7vw,20px);
  font-weight:400;line-height:1.65;max-width:64ch;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:38px;}
.btn-primary{
  text-decoration:none;background:var(--accent);color:#fff;font-size:16px;font-weight:600;
  padding:16px 32px;border-radius:12px;box-shadow:0 12px 30px rgba(31,79,224,0.36);
  border:none;cursor:pointer;font-family:inherit;
  transition:background .25s ease,transform .25s ease;
}
.btn-primary:hover{background:var(--accent-dark);transform:translateY(-2px);}
.btn-ghost{
  background:rgba(255,255,255,0.10);color:#fff;text-decoration:none;font-size:16px;font-weight:600;
  padding:16px 32px;border-radius:12px;border:1px solid rgba(255,255,255,0.28);
  backdrop-filter:blur(8px);transition:background .25s ease;
}
.btn-ghost:hover{background:rgba(255,255,255,0.18);}

/* ============ PRINCIPLES ============ */
.principles{scroll-margin-top:90px;background:var(--paper);padding:clamp(72px,11vh,140px) 0;}
.principles .container{display:flex;flex-wrap:wrap;gap:clamp(40px,6vw,90px);}
.principles-head{flex:1 1 300px;max-width:420px;}
.principles-head-sticky{position:sticky;top:104px;}
.principles-head h2{margin:0;font-weight:700;font-size:clamp(36px,5vw,60px);line-height:1.04;letter-spacing:-0.025em;color:var(--text);}
.principles-head p{margin:24px 0 0;color:var(--muted);font-size:17px;line-height:1.7;max-width:38ch;}
.principles-list{flex:1 1 460px;border-top:1px solid var(--line);}
.principle-item{border-bottom:1px solid var(--line);}
.principle-btn{
  appearance:none;background:none;border:none;cursor:pointer;width:100%;
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:clamp(22px,3vw,30px) 0;font-family:inherit;text-align:left;
}
.principle-left{display:flex;align-items:baseline;gap:16px;min-width:0;}
.principle-num{font-size:14px;font-weight:600;font-variant-numeric:tabular-nums;color:#AEB6C0;transition:color .3s ease;flex-shrink:0;}
.principle-title{margin:0;font-size:clamp(20px,2.4vw,26px);font-weight:600;letter-spacing:-0.01em;color:var(--text);transition:color .3s ease;}
.principle-item.open .principle-num,
.principle-item.open .principle-title{color:var(--accent);}
.principle-icon-circle{
  width:42px;height:42px;border-radius:50%;border:1.5px solid #CDD3DC;background:transparent;
  display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:all .3s ease;
}
.principle-item.open .principle-icon-circle{border-color:var(--accent);background:var(--accent);}
.principle-icon{position:relative;width:15px;height:15px;display:block;color:var(--text);transform:rotate(0deg);transition:transform .4s cubic-bezier(.34,1.4,.5,1),color .3s ease;}
.principle-item.open .principle-icon{color:#fff;transform:rotate(45deg);}
.principle-icon span{position:absolute;background:currentColor;border-radius:2px;}
.principle-icon .h{top:50%;left:0;width:100%;height:2px;margin-top:-1px;}
.principle-icon .v{left:50%;top:0;height:100%;width:2px;margin-left:-1px;}
.principle-body{max-height:0;opacity:0;overflow:hidden;transition:max-height .45s cubic-bezier(.4,0,.2,1),opacity .4s ease;}
.principle-item.open .principle-body{max-height:280px;opacity:1;}
.principle-body p{margin:0;padding:0 0 clamp(24px,3vw,32px) 40px;color:var(--muted);font-size:clamp(15px,1.5vw,17px);line-height:1.72;max-width:58ch;}

/* ============ BRANDS ============ */
.brands{scroll-margin-top:90px;background:#fff;padding:clamp(72px,11vh,140px) 0;}
.brands-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:clamp(30px,4vw,48px);}
.brands-head h2{margin:0;font-weight:700;font-size:clamp(30px,4.2vw,52px);line-height:1.05;letter-spacing:-0.025em;color:var(--text);}
.brands-nav{display:flex;gap:10px;}
.brands-nav button{
  width:48px;height:48px;border-radius:50%;border:1.5px solid #D9DDE3;background:#fff;color:var(--text);
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  transition:border-color .2s ease,color .2s ease,background .2s ease;
}
.brands-nav button:hover{border-color:var(--accent);color:var(--accent);}
.brand-track{overflow-x:auto;overflow-y:hidden;margin:0 -6px;padding:6px 6px 14px;scroll-snap-type:x proximity;-webkit-overflow-scrolling:touch;}
.brand-track::-webkit-scrollbar{height:8px;}
.brand-track::-webkit-scrollbar-track{background:transparent;}
.brand-track::-webkit-scrollbar-thumb{background:#D5D9E0;border-radius:8px;}
.brand-track::-webkit-scrollbar-thumb:hover{background:#B9C0CB;}
.brand-grid{display:grid;grid-template-rows:repeat(3,1fr);grid-auto-flow:column;grid-auto-columns:minmax(178px,1fr);gap:16px;width:max-content;}
.brand-card{
  scroll-snap-align:start;display:flex;align-items:center;justify-content:center;
  height:104px;width:200px;padding:18px 20px;background:#fff;border:1px solid var(--line-soft);
  border-radius:var(--radius);transition:border-color .2s ease,box-shadow .2s ease,transform .2s ease;
}
.brand-card:hover{border-color:var(--accent);box-shadow:0 8px 24px rgba(31,79,224,0.10);transform:translateY(-2px);}
.brand-card img{max-height:54px;max-width:152px;width:auto;height:auto;object-fit:contain;}
.brand-card span{
  font-weight:700;font-size:15px;letter-spacing:0.02em;color:var(--text);text-align:center;
  line-height:1.25;
}
.brand-card.featured span{color:var(--accent);}

@media (max-width:640px){
  .brands-nav{display:none;}
  .brand-track{overflow-x:auto;overflow-y:hidden;margin:0;padding:4px 0 12px;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;}
  .brand-grid{grid-template-rows:repeat(3,88px);grid-auto-columns:calc((100vw - 52px) / 2);gap:12px;}
  .brand-card{width:calc((100vw - 52px) / 2);height:88px;padding:12px;}
}

/* ============ ABOUT ============ */
.about{scroll-margin-top:90px;background:var(--ink);color:#fff;padding:clamp(72px,11vh,140px) 0;}
.about .container{display:flex;flex-wrap:wrap;gap:clamp(40px,6vw,90px);}
.about-head{flex:1 1 280px;max-width:420px;}
.about-head h2{margin:0;font-weight:700;font-size:clamp(36px,5vw,60px);line-height:1.04;letter-spacing:-0.025em;}
.about-body{flex:1 1 460px;}
.about-body p{margin:0;color:rgba(255,255,255,0.80);font-size:clamp(16px,1.6vw,19px);line-height:1.78;max-width:62ch;}
.about-body p + p{margin-top:22px;}
.about-stats{display:flex;flex-wrap:wrap;gap:clamp(28px,5vw,64px);margin-top:48px;padding-top:40px;border-top:1px solid rgba(255,255,255,0.12);}
.about-stat-num{font-size:clamp(34px,4vw,46px);font-weight:700;letter-spacing:-0.02em;color:#fff;}
.about-stat-label{margin-top:6px;color:rgba(255,255,255,0.55);font-size:14px;font-weight:500;}

/* ============ CONTACTS ============ */
.contacts{scroll-margin-top:90px;background:var(--paper);padding:clamp(72px,11vh,140px) 0;}
.contacts .container{display:flex;flex-wrap:wrap;gap:clamp(40px,6vw,90px);}
.contacts-head{flex:1 1 280px;max-width:420px;}
.contacts-head h2{margin:0;font-weight:700;font-size:clamp(36px,5vw,60px);line-height:1.04;letter-spacing:-0.025em;color:var(--text);}
.contacts-head p{margin:24px 0 0;color:var(--muted);font-size:17px;line-height:1.7;max-width:38ch;}
.contacts-grid{flex:1 1 460px;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:28px;}
.contact-card{background:#fff;border:1px solid var(--line-soft);border-radius:var(--radius);padding:26px;}
.contact-card-label{font-size:13px;font-weight:600;letter-spacing:0.1em;text-transform:uppercase;color:var(--muted);margin-bottom:10px;}
.contact-card-value{font-size:19px;font-weight:700;color:var(--text);text-decoration:none;display:inline-flex;align-items:center;gap:9px;word-break:break-word;}
.contact-card-value:hover{color:var(--accent);}
.contact-card-value svg{flex-shrink:0;color:var(--accent);}

/* ============ FOOTER ============ */
.site-footer{background:var(--ink);color:#fff;padding:clamp(64px,9vh,110px) 0 32px;}
.footer-top{display:grid;grid-template-columns:1.1fr 1fr 1.6fr;gap:clamp(40px,6vw,70px);}
.footer-brand p{margin:0;color:rgba(255,255,255,0.55);font-size:16px;line-height:1.7;}
.footer-brand .logo-text{color:#fff;}
.footer-col-label{color:rgba(255,255,255,0.45);font-size:13px;font-weight:600;letter-spacing:0.16em;text-transform:uppercase;margin-bottom:18px;}
.footer-contact-line{margin-bottom:20px;}
.footer-contact-line .k{color:rgba(255,255,255,0.45);font-size:14px;margin-bottom:6px;}
.footer-contact-line .v{color:#fff;font-size:17px;font-weight:600;text-decoration:none;display:inline-flex;align-items:center;gap:8px;}
.footer-contact-line .v:hover{color:#9FB4FF;}
.footer-contact-line .v svg{flex-shrink:0;}
.footer-messengers{display:flex;gap:14px;margin-top:22px;}
.footer-messengers a{
  width:48px;height:48px;border-radius:13px;background:rgba(255,255,255,0.06);
  border:1px solid rgba(255,255,255,0.12);display:flex;align-items:center;justify-content:center;
  color:#fff;transition:background .25s ease,transform .25s ease,border-color .25s ease;
}
.footer-messengers a:hover{background:var(--accent);border-color:var(--accent);transform:translateY(-3px);}

.footer-brands-grid{
  display:grid;grid-template-columns:repeat(3,1fr);
  column-gap:24px;row-gap:11px;
}
.footer-brands-grid a{
  font-size:14px;color:rgba(255,255,255,0.68);text-decoration:none;letter-spacing:0.01em;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
  transition:color .2s ease;
}
.footer-brands-grid a:hover{color:#fff;}

.footer-legal{
  margin-top:clamp(44px,7vh,72px);padding-top:24px;border-top:1px solid rgba(255,255,255,0.10);
}
.footer-legal p{margin:0 0 14px;color:rgba(255,255,255,0.38);font-size:13px;line-height:1.7;max-width:90ch;}
.footer-bottom{display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;align-items:center;margin-top:14px;}
.footer-bottom span{color:rgba(255,255,255,0.42);font-size:14px;}

@media (max-width:900px){
  .footer-top{grid-template-columns:1fr;gap:40px;}
  .footer-brands-grid{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:480px){
  .footer-brands-grid{grid-template-columns:1fr 1fr;}
}

/* ============ CONTACT FORM MODAL ============ */
.modal-overlay{
  position:fixed;inset:0;z-index:200;background:rgba(10,16,19,0.55);
  backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);
  display:none;align-items:center;justify-content:center;padding:20px;
}
.modal-overlay.open{display:flex;}
.modal-box{
  position:relative;width:100%;max-width:480px;max-height:92vh;overflow-y:auto;
  background:#fff;border-radius:20px;padding:clamp(26px,4vw,40px);
  box-shadow:0 30px 80px rgba(10,16,19,0.45);
}
.modal-close{
  position:absolute;top:16px;right:16px;width:38px;height:38px;border-radius:50%;
  border:none;background:#F1F3F6;color:var(--text);cursor:pointer;
  display:flex;align-items:center;justify-content:center;transition:background .2s ease;
}
.modal-close:hover{background:#E2E6EC;}
.modal-box h3{margin:0 36px 26px 0;font-size:clamp(18px,2.4vw,22px);font-weight:700;letter-spacing:0.01em;text-transform:uppercase;line-height:1.3;color:var(--text);}
.form-field-group{display:flex;flex-direction:column;gap:20px;}
.field{
  width:100%;border:none;border-bottom:1.5px solid #D9DDE3;background:transparent;
  padding:12px 2px;font-family:inherit;font-size:16px;color:var(--text);outline:none;box-sizing:border-box;
}
.field:focus{border-bottom-color:var(--accent);}
textarea.field{min-height:70px;resize:vertical;line-height:1.5;}
.phone-row{display:flex;align-items:center;gap:10px;border-bottom:1.5px solid #D9DDE3;}
.phone-flag{width:22px;height:15px;border-radius:2px;overflow:hidden;display:flex;flex-direction:column;box-shadow:0 0 0 1px rgba(0,0,0,0.07);flex-shrink:0;}
.phone-flag span{flex:1;}
.phone-code{font-size:16px;color:var(--text);font-weight:500;padding-bottom:1px;}
.phone-row .field{border-bottom:none;flex:1;}
.file-label{
  display:inline-flex;align-items:center;gap:8px;background:var(--accent);color:#fff;font-size:14px;font-weight:600;
  padding:11px 18px;border-radius:9px;cursor:pointer;transition:background .2s ease;
}
.file-label:hover{background:var(--accent-dark);}
.file-names{margin-top:10px;font-size:13px;color:var(--muted);word-break:break-word;}
.submit-btn{
  margin-top:6px;width:100%;appearance:none;border:none;cursor:pointer;font-family:inherit;
  background:var(--accent);color:#fff;font-size:16px;font-weight:600;padding:16px;border-radius:11px;
  box-shadow:0 12px 30px rgba(31,79,224,0.32);transition:background .25s ease,transform .25s ease;
}
.submit-btn:hover{background:var(--accent-dark);transform:translateY(-1px);}
.form-success{text-align:center;padding:28px 0 12px;display:none;}
.form-success.show{display:block;}
.form-success-icon{width:64px;height:64px;border-radius:50%;background:var(--accent);display:flex;align-items:center;justify-content:center;margin:0 auto 22px;}
.form-success h3{margin:0 0 10px;font-size:22px;font-weight:700;color:var(--text);text-transform:none;}
.form-success p{margin:0;color:var(--muted);font-size:15px;line-height:1.6;}

.wechat-modal-box{max-width:340px;padding:32px;display:flex;flex-direction:column;align-items:center;}
.wechat-qr-img{width:100%;max-width:270px;height:auto;border-radius:12px;}

/* Reduced motion */
@media (prefers-reduced-motion: reduce){
  *{animation-duration:0.001ms !important;animation-iteration-count:1 !important;transition-duration:0.001ms !important;}
  html{scroll-behavior:auto;}
}

/* Focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible{
  outline:2px solid var(--accent);outline-offset:2px;
}