/* ═══════════════════════════════════════════
   ЧАН OTR TYRES — style.css
   Design: Dark Industrial · Bebas Neue + DM Sans
   All devices: mobile / tablet / desktop
═══════════════════════════════════════════ */

/* ─── VARIABLES ─── */
:root {
  --bg:        #0d0d0f;
  --bg2:       #131417;
  --bg3:       #1a1c22;
  --bg4:       #21242b;
  --card:      #161820;
  --orange:    #f97316;
  --orange-d:  #c25a0d;
  --orange-g:  rgba(249,115,22,.14);
  --orange-g2: rgba(249,115,22,.06);
  --white:     #f0ede8;
  --muted:     #7a7d87;
  --muted2:    #4a4d57;
  --border:    rgba(255,255,255,.07);
  --border2:   rgba(255,255,255,.04);
  --font-d:    'Bebas Neue', sans-serif;
  --font-b:    'DM Sans', sans-serif;
  --nav-h:     70px;
  --gap:       clamp(16px, 4vw, 72px);
  --r:         12px;
  --r2:        20px;
  --ease:      cubic-bezier(.25,.46,.45,.94);
}

/* ─── RESET ─── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font-b);font-size:16px;line-height:1.6;color:var(--white);background:var(--bg);overflow-x:hidden;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
button{cursor:pointer;font-family:inherit}
input,textarea{font-family:inherit}

/* ─── UTILS ─── */
.container{width:100%;max-width:1280px;margin:0 auto;padding:0 var(--gap)}
.hidden{display:none!important}

/* ─── BUTTONS ─── */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font-d);font-size:1rem;letter-spacing:.1em;text-transform:uppercase;
  padding:13px 30px;border-radius:var(--r);border:none;cursor:pointer;
  transition:background .22s var(--ease),transform .15s var(--ease),box-shadow .22s var(--ease);
  white-space:nowrap;text-decoration:none;
}
.btn:focus-visible{outline:2px solid var(--orange);outline-offset:3px}
.btn-primary{background:var(--orange);color:#fff}
.btn-primary:hover{background:var(--orange-d);transform:translateY(-2px);box-shadow:0 8px 24px rgba(249,115,22,.32)}
.btn-ghost{background:transparent;color:var(--white);border:1px solid var(--border)}
.btn-ghost:hover{border-color:var(--orange);background:var(--orange-g);color:var(--orange)}

/* ─── SECTION HELPERS ─── */
.section-tag{display:inline-block;font-size:.72rem;font-weight:600;letter-spacing:.2em;text-transform:uppercase;color:var(--orange);margin-bottom:10px}
.section-title{font-family:var(--font-d);font-size:clamp(2.2rem,5vw,3.6rem);letter-spacing:.03em;line-height:1;color:var(--white)}
.section-lead{font-size:.98rem;font-weight:300;color:var(--muted);max-width:620px;margin-top:12px;line-height:1.75}
.section-header{margin-bottom:clamp(32px,4vw,52px)}

/* ─── REVEAL ANIMATION ─── */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.visible{opacity:1;transform:translateY(0)}
.reveal-delay-1{transition-delay:.09s}
.reveal-delay-2{transition-delay:.18s}
.reveal-delay-3{transition-delay:.27s}
.reveal-delay-4{transition-delay:.36s}

/* ════════════════════════════════
   NAVIGATION
════════════════════════════════ */
.site-header{position:sticky;top:0;z-index:200;width:100%}
.navbar{
  height:var(--nav-h);
  background:rgba(13,13,15,.94);
  backdrop-filter:blur(18px) saturate(160%);
  -webkit-backdrop-filter:blur(18px) saturate(160%);
  border-bottom:1px solid var(--border);
  display:flex;align-items:center;padding:0 var(--gap);gap:20px;
}

.nav-logo{display:flex;flex-direction:column;line-height:1;flex-shrink:0;text-decoration:none}
.logo-by{font-size:.6rem;font-weight:600;letter-spacing:.25em;color:var(--muted)}
.logo-brand{font-family:var(--font-d);font-size:1.4rem;letter-spacing:.06em;color:var(--white)}
.logo-brand em{color:var(--orange);font-style:normal}

.nav-links{display:flex;align-items:center;gap:2px;margin-left:auto;list-style:none}
.nav-link{font-size:.87rem;font-weight:500;color:var(--muted);padding:6px 14px;border-radius:8px;transition:color .2s,background .2s}
.nav-link:hover,.nav-link.active{color:var(--white);background:var(--bg3)}

.nav-right{display:flex;align-items:center;gap:10px;margin-left:16px}

/* Language Dropdown */
.lang-dropdown{position:relative}
.lang-trigger{
  display:flex;align-items:center;gap:6px;
  background:var(--bg3);border:1px solid var(--border);border-radius:8px;
  padding:7px 12px;color:var(--white);font-size:.85rem;font-weight:600;
  transition:border-color .2s;
}
.lang-trigger:hover{border-color:var(--orange)}
.chevron{width:14px;height:14px;stroke:var(--muted);fill:none;transition:transform .2s var(--ease)}
.lang-dropdown.open .chevron{transform:rotate(180deg)}
.lang-menu{
  position:absolute;top:calc(100% + 8px);right:0;
  background:var(--bg3);border:1px solid var(--border);border-radius:var(--r);
  min-width:150px;box-shadow:0 16px 40px rgba(0,0,0,.55);
  opacity:0;transform:translateY(-6px);pointer-events:none;
  transition:opacity .2s var(--ease),transform .2s var(--ease);z-index:300;overflow:hidden;
}
.lang-dropdown.open .lang-menu{opacity:1;transform:translateY(0);pointer-events:auto}
.lang-option{
  display:flex;align-items:center;gap:10px;padding:11px 16px;
  font-size:.87rem;font-weight:500;color:var(--muted);cursor:pointer;
  transition:background .15s,color .15s;
}
.lang-option:hover{background:var(--bg4);color:var(--white)}
.lang-option.active{color:var(--orange)}
.lang-option span{font-size:1.1rem}

/* Hamburger */
.hamburger{display:none;flex-direction:column;justify-content:space-between;width:26px;height:18px;background:none;border:none;padding:0}
.hamburger span{display:block;width:100%;height:2px;background:var(--white);border-radius:2px;transition:transform .3s var(--ease),opacity .2s}
.hamburger.open span:nth-child(1){transform:translateY(8px) rotate(45deg)}
.hamburger.open span:nth-child(2){opacity:0}
.hamburger.open span:nth-child(3){transform:translateY(-8px) rotate(-45deg)}

/* Mobile Menu */
.mobile-menu{
  position:absolute;top:var(--nav-h);left:0;right:0;
  background:rgba(13,13,15,.97);backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border);
  padding:18px var(--gap) 26px;
  display:none;flex-direction:column;gap:4px;
}
.mobile-menu.open{display:flex}
.mob-link{
  display:block;padding:12px 0;font-size:1rem;font-weight:500;color:var(--muted);
  border-bottom:1px solid var(--border2);transition:color .2s;
}
.mob-link:hover{color:var(--white)}

/* ════════════════════════════════
   HERO
════════════════════════════════ */
.hero{
  position:relative;
  min-height:calc(100vh - var(--nav-h));
  display:grid;grid-template-columns:1fr 1fr;
  align-items:center;
  padding:clamp(60px,8vw,110px) var(--gap);
  gap:clamp(40px,6vw,80px);
  overflow:hidden;
}

/* Subtle grid overlay */
.hero-grid-bg{
  position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(249,115,22,.04) 1px,transparent 1px),
    linear-gradient(90deg,rgba(249,115,22,.04) 1px,transparent 1px);
  background-size:60px 60px;
  -webkit-mask-image:radial-gradient(ellipse 80% 80% at 60% 50%,#000 30%,transparent 100%);
  mask-image:radial-gradient(ellipse 80% 80% at 60% 50%,#000 30%,transparent 100%);
}
.hero::after{
  content:'';position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(ellipse 50% 70% at 70% 50%,rgba(249,115,22,.07) 0%,transparent 65%);
}

.hero-content{position:relative;z-index:1}

.hero-eyebrow{
  display:flex;align-items:center;gap:10px;
  font-size:.75rem;font-weight:600;letter-spacing:.2em;text-transform:uppercase;
  color:var(--orange);margin-bottom:18px;
  animation:fadeUp .7s var(--ease) both;
}
.eyebrow-dot{
  width:8px;height:8px;border-radius:50%;background:var(--orange);
  box-shadow:0 0 0 3px rgba(249,115,22,.2);flex-shrink:0;
}

.hero-title{
  font-family:var(--font-d);
  font-size:clamp(4.5rem,9vw,8.5rem);
  letter-spacing:.03em;line-height:.9;
  margin-bottom:6px;
  animation:fadeUp .7s .08s var(--ease) both;
}
.hero-title em{
  display:block;
  color:transparent;
  -webkit-text-stroke:2px var(--orange);
  font-style:normal;
}

.hero-sub-title{
  font-family:var(--font-d);
  font-size:clamp(1.1rem,2.5vw,1.9rem);
  letter-spacing:.06em;
  color:var(--muted);
  margin-bottom:24px;
  animation:fadeUp .7s .14s var(--ease) both;
}

.hero-desc{
  font-size:clamp(.93rem,1.2vw,1.05rem);font-weight:300;color:var(--muted);
  max-width:480px;line-height:1.78;margin-bottom:36px;
  animation:fadeUp .7s .2s var(--ease) both;
}

.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:32px;animation:fadeUp .7s .26s var(--ease) both}

.hero-sizes{
  display:flex;flex-wrap:wrap;gap:8px;
  animation:fadeUp .7s .32s var(--ease) both;
}
.size-pill{
  font-family:var(--font-d);font-size:.78rem;letter-spacing:.07em;
  color:var(--muted);border:1px solid var(--border);border-radius:6px;
  padding:5px 12px;background:var(--bg3);
  transition:color .2s,border-color .2s,background .2s;
}
.size-pill:hover{color:var(--orange);border-color:rgba(249,115,22,.4);background:var(--orange-g2)}

/* Hero Visual */
.hero-visual{position:relative;z-index:1;display:flex;align-items:center;justify-content:center;animation:fadeIn 1s .35s var(--ease) both}
.hero-img{
  width:100%;max-width:580px;border-radius:var(--r2);object-fit:cover;aspect-ratio:4/3;
  box-shadow:0 0 0 1px var(--border),0 40px 80px rgba(0,0,0,.6);
  filter:brightness(.88) contrast(1.1);
}
.hero-glow{
  position:absolute;bottom:-24px;left:50%;transform:translateX(-50%);
  width:65%;height:50px;background:var(--orange);filter:blur(44px);opacity:.15;border-radius:50%;
  pointer-events:none;
}

/* ════════════════════════════════
   STATS BAR
════════════════════════════════ */
.stats-bar{
  display:flex;align-items:center;justify-content:center;flex-wrap:wrap;
  background:var(--bg2);border-top:1px solid var(--border);border-bottom:1px solid var(--border);
  padding:clamp(22px,3.5vw,36px) var(--gap);
}
.stat{flex:1 1 150px;display:flex;flex-direction:column;align-items:center;text-align:center;gap:4px;padding:14px 20px}
.stat-num{font-family:var(--font-d);font-size:clamp(1.9rem,3.5vw,2.8rem);letter-spacing:.02em;color:var(--orange)}
.stat-lbl{font-size:.72rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.stat-sep{width:1px;height:40px;background:var(--border);flex-shrink:0}

/* ════════════════════════════════
   PRODUCTS
════════════════════════════════ */
.products-section{padding:clamp(60px,8vw,100px) 0;background:var(--bg)}

.products-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:clamp(14px,2vw,22px);
}

.product-card{
  background:var(--card);border-radius:var(--r);border:1px solid var(--border);
  overflow:hidden;
  transition:border-color .25s,transform .25s var(--ease),box-shadow .25s;
  cursor:pointer;
}
.product-card:hover{
  border-color:rgba(249,115,22,.45);transform:translateY(-5px);
  box-shadow:0 20px 50px rgba(0,0,0,.4),0 0 0 1px rgba(249,115,22,.08);
}

.product-img-wrap{
  background:#18191f;aspect-ratio:1;
  display:flex;align-items:center;justify-content:center;
  overflow:hidden;padding:16px;position:relative;
}
.product-img-wrap::after{
  content:'';position:absolute;inset:0;
  background:radial-gradient(ellipse at center,rgba(249,115,22,.07) 0%,transparent 70%);
  opacity:0;transition:opacity .25s;
}
.product-card:hover .product-img-wrap::after{opacity:1}
.product-img{
  width:100%;height:100%;object-fit:contain;
  transition:transform .4s var(--ease);
}
.product-card:hover .product-img{transform:scale(1.07) rotate(.8deg)}

.product-info{padding:clamp(14px,1.5vw,20px)}
.product-name{font-size:.93rem;font-weight:600;color:var(--white);line-height:1.35;margin-bottom:8px}
.product-size{
  font-family:var(--font-d);font-size:1.1rem;letter-spacing:.06em;
  color:var(--orange);margin-bottom:8px;
}
.product-desc{font-size:.79rem;font-weight:300;color:var(--muted);line-height:1.55;margin-bottom:14px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

.product-inquiry{
  width:100%;padding:9px;font-family:var(--font-d);font-size:.8rem;letter-spacing:.06em;
  text-transform:uppercase;color:var(--orange);background:transparent;
  border:1px solid rgba(249,115,22,.35);border-radius:7px;cursor:pointer;
  transition:background .2s,color .2s,border-color .2s;
}
.product-inquiry:hover{background:var(--orange);color:#fff;border-color:var(--orange)}

.load-more-wrap{text-align:center;margin-top:clamp(36px,5vw,52px)}

/* ════════════════════════════════
   ABOUT
════════════════════════════════ */
.about-section{
  padding:clamp(60px,8vw,100px) 0;
  background:var(--bg2);border-top:1px solid var(--border);
}
.about-grid{
  display:grid;grid-template-columns:1fr 1.2fr;
  gap:clamp(40px,6vw,80px);align-items:center;
}
.about-visual{position:relative;border-radius:var(--r2);overflow:visible}
.about-img{
  width:100%;border-radius:var(--r2);object-fit:cover;aspect-ratio:4/5;
  box-shadow:0 0 0 1px var(--border),0 32px 60px rgba(0,0,0,.5);
  filter:brightness(.85);
}
.about-badge{
  position:absolute;bottom:-18px;right:-18px;
  display:flex;align-items:center;gap:10px;
  background:var(--orange);color:#fff;border-radius:10px;
  padding:12px 18px;font-weight:600;font-size:.9rem;
  box-shadow:0 8px 24px rgba(249,115,22,.35);
  white-space:nowrap;
}
.about-text{}
.about-lead{font-size:1rem;font-weight:300;color:var(--muted);line-height:1.78;margin:14px 0 32px}

.why-list{display:flex;flex-direction:column;gap:24px}
.why-item{display:flex;align-items:flex-start;gap:16px}
.why-icon{font-size:1.6rem;flex-shrink:0;line-height:1}
.why-item h3{font-family:var(--font-d);font-size:1.1rem;letter-spacing:.04em;color:var(--white);margin-bottom:5px}
.why-item p{font-size:.86rem;font-weight:300;color:var(--muted);line-height:1.65}

/* ════════════════════════════════
   CONTACT
════════════════════════════════ */
.contact-section{padding:clamp(60px,8vw,110px) 0;background:var(--bg)}
.contact-grid{display:grid;grid-template-columns:1fr 1.3fr;gap:clamp(40px,6vw,80px);align-items:start}

.contact-lead{font-size:1rem;font-weight:300;color:var(--muted);line-height:1.72;margin:14px 0 28px}

.contact-details{display:flex;flex-direction:column;gap:14px;margin-bottom:28px}
.contact-details li{display:flex;align-items:center;gap:12px;font-size:.9rem;color:var(--muted)}
.contact-details svg{width:18px;height:18px;stroke:var(--orange);stroke-width:2;fill:none;flex-shrink:0}
.contact-details a:hover{color:var(--orange)}

.contact-sizes-block{}
.sizes-label{font-size:.75rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:10px;display:block}
.size-chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  font-family:var(--font-d);font-size:.8rem;letter-spacing:.05em;
  color:var(--orange);background:var(--orange-g2);
  border:1px solid rgba(249,115,22,.22);border-radius:6px;padding:5px 12px;
}

/* Form */
.contact-form{display:flex;flex-direction:column;gap:16px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-field{display:flex;flex-direction:column;gap:8px}
.form-field label{font-size:.76rem;font-weight:600;letter-spacing:.09em;text-transform:uppercase;color:var(--muted)}
.form-field input,.form-field textarea{
  background:var(--bg3);border:1px solid var(--border);border-radius:var(--r);
  padding:12px 15px;color:var(--white);font-size:.93rem;outline:none;width:100%;
  transition:border-color .2s,background .2s;
}
.form-field input:focus,.form-field textarea:focus{border-color:var(--orange);background:var(--bg4)}
.form-field input::placeholder,.form-field textarea::placeholder{color:var(--muted2)}
.form-field textarea{resize:vertical;min-height:120px}
.form-submit{align-self:flex-start}
.form-note{font-size:.75rem;color:var(--muted2)}
.form-success{font-size:.9rem;color:#4ade80;font-weight:500;padding:12px;background:rgba(74,222,128,.08);border-radius:8px;border:1px solid rgba(74,222,128,.2)}
.form-error{font-size:.9rem;color:#f87171;font-weight:500;padding:12px;background:rgba(248,113,113,.08);border-radius:8px;border:1px solid rgba(248,113,113,.2)}

/* ════════════════════════════════
   FOOTER
════════════════════════════════ */
.site-footer{background:var(--bg2);border-top:1px solid var(--border);padding:clamp(48px,6vw,72px) 0 0}
.footer-grid{display:grid;grid-template-columns:1.8fr 1fr 1fr 1fr;gap:clamp(24px,4vw,48px);padding-bottom:48px}
.footer-logo{font-family:var(--font-d);font-size:1.5rem;letter-spacing:.06em;margin-bottom:6px}
.footer-logo em{color:var(--orange);font-style:normal}
.footer-tagline{font-size:.75rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--orange);margin-bottom:12px}
.footer-about{font-size:.85rem;font-weight:300;color:var(--muted);line-height:1.7;max-width:280px}
.footer-col-title{font-size:.72rem;font-weight:700;letter-spacing:.2em;text-transform:uppercase;color:var(--orange);margin-bottom:16px}
.footer-list{display:flex;flex-direction:column;gap:9px}
.footer-list li,.footer-list a{font-size:.85rem;color:var(--muted);transition:color .2s}
.footer-list a:hover{color:var(--white)}
.footer-bottom{border-top:1px solid var(--border);padding:20px 0;display:flex;justify-content:space-between;align-items:center;font-size:.78rem;color:var(--muted2);flex-wrap:wrap;gap:8px}

/* ════════════════════════════════
   ANIMATIONS
════════════════════════════════ */
@keyframes fadeUp{from{opacity:0;transform:translateY(28px)}to{opacity:1;transform:translateY(0)}}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}

/* ════════════════════════════════
   RESPONSIVE — TABLET ≤ 1024px
════════════════════════════════ */
@media(max-width:1024px){
  .products-grid{grid-template-columns:repeat(3,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
}

/* ════════════════════════════════
   RESPONSIVE — MOBILE ≤ 768px
════════════════════════════════ */
@media(max-width:768px){
  :root{--nav-h:64px}
  .nav-links{display:none}
  .hamburger{display:flex}

  .hero{grid-template-columns:1fr;text-align:center;padding:56px var(--gap) 48px;gap:40px}
  .hero-visual{order:-1}
  .hero-img{max-width:100%;aspect-ratio:16/10}
  .hero-eyebrow{justify-content:center}
  .hero-desc{margin-left:auto;margin-right:auto}
  .hero-actions{justify-content:center}
  .hero-sizes{justify-content:center}
  .hero-title{font-size:clamp(3.8rem,15vw,6rem)}

  .stat-sep{display:none}
  .stat{flex:1 1 45%}

  .products-grid{grid-template-columns:repeat(2,1fr);gap:12px}

  .about-grid{grid-template-columns:1fr}
  .about-visual{display:none} /* hide large image on mobile, show text focused */
  .about-badge{display:none}

  .contact-grid{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}

  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
  .footer-bottom{flex-direction:column;text-align:center}
}

/* ════════════════════════════════
   RESPONSIVE — SMALL ≤ 480px
════════════════════════════════ */
@media(max-width:480px){
  .products-grid{grid-template-columns:1fr 1fr;gap:10px}
  .footer-grid{grid-template-columns:1fr}
  .btn{padding:11px 20px;font-size:.9rem}
  .hero-title{font-size:clamp(3.2rem,17vw,5rem)}
  .stat-num{font-size:1.7rem}
}

/* ════════════════════════════════
   ACCESSIBILITY
════════════════════════════════ */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
  .reveal{opacity:1;transform:none}
}
@media print{
  .site-header,.hamburger,.mobile-menu,.hero-actions,.load-more-wrap,.contact-form{display:none}
  body{background:#fff;color:#000}
}