/* =========================================================
   Sercn — 碳化钨手术器械镶片中国官网
   Visual fidelity: Kaleidex Group / serrations.com theme
   ========================================================= */

/* ── Design Tokens ── */
:root {
  --kdx-purple:        #3e0551;
  --kdx-purple-dark:   #2a0438;
  --kdx-purple-deeper: #1a0226;
  --kdx-orange:        #ff730d;
  --kdx-orange-burnt:  #d54200;
  --kdx-blue:          #abd1f3;
  --kdx-white:         #ffffff;
  --kdx-gray-50:       #f9f9f9;
  --kdx-gray-100:      #f0f0f0;
  --kdx-gray-200:      #e0e0e0;
  --kdx-gray-400:      #999;
  --kdx-gray-600:      #666;
  --kdx-gray-800:      #2a2a2a;

  --max-w:  1200px;
  --r-sm:   40px;
  --r-lg:   115px;
  --r-xl:   230px;

  --font: 'Microsoft YaHei','PingFang SC','Helvetica Neue',Arial,sans-serif;
}

/* ── Reset ── */
*,*::before,*::after { box-sizing:border-box; margin:0; padding:0; }
html { scroll-behavior:smooth; }
body { font-family:var(--font); color:var(--kdx-gray-800); background:var(--kdx-white); line-height:1.75; -webkit-font-smoothing:antialiased; }
img { max-width:100%; height:auto; display:block; }
a { color:var(--kdx-purple); text-decoration:none; transition:color .25s; }
a:hover { color:var(--kdx-orange); }
ul,ol { list-style:none; }
button { cursor:pointer; font-family:inherit; }

/* ── Layout helpers ── */
.container { max-width:var(--max-w); margin:0 auto; padding:0 48px; }
.section { padding:88px 0; }
.section-sm { padding:56px 0; }
.visually-hidden { position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0,0,0,0); }

/* ── Typography ── */
.label {
  display:inline-block;
  font-size:12px; font-weight:700; letter-spacing:2.5px; text-transform:uppercase;
  color:var(--kdx-orange-burnt);
  margin-bottom:14px;
}
.title-xl { font-size:clamp(28px,4.5vw,42px); font-weight:600; line-height:1.2; letter-spacing:-.3px; }
.title-lg  { font-size:clamp(24px,3.5vw,34px); font-weight:600; line-height:1.25; }
.title-md  { font-size:clamp(18px,2vw,22px); font-weight:600; line-height:1.3; }
.text-lead { font-size:17px; color:var(--kdx-gray-600); line-height:1.75; max-width:620px; }
.text-center { text-align:center; }
.mx-auto { margin-left:auto; margin-right:auto; }
.mb-8  { margin-bottom:8px; }
.mb-16 { margin-bottom:16px; }
.mb-24 { margin-bottom:24px; }
.mb-32 { margin-bottom:32px; }
.mb-48 { margin-bottom:48px; }

/* ── Buttons ── */
.btn {
  display:inline-block; padding:14px 34px;
  font-size:13px; font-weight:600; letter-spacing:1.5px; text-transform:uppercase;
  border-radius:9999px; border:2px solid transparent;
  transition:all .25s; cursor:pointer;
}
.btn-primary {
  background:var(--kdx-orange); color:var(--kdx-white); border-color:var(--kdx-orange);
}
.btn-primary:hover { background:var(--kdx-orange-burnt); border-color:var(--kdx-orange-burnt); color:var(--kdx-white); }
.btn-outline-white {
  background:transparent; color:var(--kdx-white); border-color:var(--kdx-white);
}
.btn-outline-white:hover { background:var(--kdx-white); color:var(--kdx-purple); }
.btn-outline-purple {
  background:transparent; color:var(--kdx-purple); border-color:var(--kdx-purple);
}
.btn-outline-purple:hover { background:var(--kdx-purple); color:var(--kdx-white); }

/* ══════════════════════════════════════════════════════════
   HEADER
   ══════════════════════════════════════════════════════════ */
.site-header {
  position:sticky; top:0; z-index:1000;
  background:var(--kdx-purple);
  box-shadow:0 2px 12px rgba(0,0,0,.15);
}
.header-inner {
  max-width:var(--max-w); margin:0 auto; padding:0 48px;
  display:flex; align-items:center; justify-content:space-between; height:76px;
}
.brand {
  display:flex; align-items:center; gap:14px;
  color:var(--kdx-white); text-decoration:none;
}
.brand-logo img { height:38px; width:auto; }
.brand-name {
  font-size:20px; font-weight:700; letter-spacing:.5px; line-height:1.2;
}
.brand-tagline {
  font-size:10px; letter-spacing:2px; opacity:.65; font-weight:400;
  text-transform:uppercase;
}

.main-nav ul { display:flex; gap:30px; align-items:center; }
.main-nav a {
  color:var(--kdx-white); font-size:13.5px; font-weight:500;
  position:relative; padding:6px 0; letter-spacing:.3px;
  transition:color .25s;
}
.main-nav a::after {
  content:''; position:absolute; bottom:0; left:0; width:0; height:2px;
  background:var(--kdx-orange); transition:width .25s;
}
.main-nav a:hover { color:var(--kdx-orange); }
.main-nav a:hover::after { width:100%; }

.nav-cta {
  background:var(--kdx-orange) !important; color:var(--kdx-white) !important;
  padding:10px 26px !important; border-radius:9999px !important;
  font-weight:600 !important; letter-spacing:1px !important;
  transition:background .25s !important;
}
.nav-cta:hover { background:var(--kdx-orange-burnt) !important; color:var(--kdx-white) !important; }
.nav-cta::after { display:none !important; }

.mobile-toggle {
  display:none; flex-direction:column; gap:5px;
  background:none; border:none; padding:8px;
}
.mobile-toggle span {
  display:block; width:22px; height:2px; background:var(--kdx-white);
  transition:transform .3s;
}

/* ══════════════════════════════════════════════════════════
   HERO
   ══════════════════════════════════════════════════════════ */
.hero {
  background:linear-gradient(135deg, var(--kdx-purple) 0%, #4a0a6b 60%, var(--kdx-purple-dark) 100%);
  color:var(--kdx-white); overflow:hidden;
}
.hero-grid {
  max-width:var(--max-w); margin:0 auto; padding:96px 48px 80px;
  display:grid; grid-template-columns:1fr 1fr; gap:6%; align-items:center;
}
.hero-badge {
  display:inline-block; background:var(--kdx-orange); color:var(--kdx-white);
  padding:7px 22px; font-size:11px; font-weight:700; letter-spacing:2px;
  border-radius:9999px; margin-bottom:28px;
}
.hero-title {
  font-size:clamp(30px,4.2vw,46px); font-weight:500; line-height:1.18;
  letter-spacing:-.5px; margin-bottom:18px;
}
.hero-desc {
  font-size:17px; line-height:1.7; opacity:.82; margin-bottom:36px; max-width:480px;
}
.hero-btns { display:flex; gap:14px; flex-wrap:wrap; }
.hero-media {
  position:relative; aspect-ratio:1/1;
  border-radius:var(--r-sm);
  overflow:hidden;
  box-shadow:0 24px 80px rgba(0,0,0,.35);
}
.hero-media img { width:100%; height:100%; object-fit:cover; }

/* ══════════════════════════════════════════════════════════
   SPECIALIST MANUFACTURER (light-blue band)
   ══════════════════════════════════════════════════════════ */
.brand-band {
  background:var(--kdx-blue); padding:80px 0;
}
.brand-band-grid {
  max-width:var(--max-w); margin:0 auto; padding:0 48px;
  display:grid; grid-template-columns:auto 1fr; gap:56px; align-items:center;
}
.brand-band-logo { max-width:220px; }
.brand-band-logo img { width:100%; }
.brand-band-label {
  font-size:12px; font-weight:700; letter-spacing:2.5px; text-transform:uppercase;
  color:var(--kdx-orange-burnt); margin-bottom:14px;
}
.brand-band-title {
  font-size:clamp(22px,3vw,32px); font-weight:600; color:var(--kdx-purple);
  margin-bottom:16px;
}
.brand-band-text {
  font-size:15.5px; color:var(--kdx-gray-800); line-height:1.8; margin-bottom:12px;
}
.brand-band-link {
  display:inline-flex; align-items:center; gap:8px;
  color:var(--kdx-orange); font-weight:600; font-size:14px;
  border-bottom:2px solid var(--kdx-orange); padding-bottom:4px; margin-top:14px;
}
.brand-band-link:hover { color:var(--kdx-orange-burnt); }

/* ══════════════════════════════════════════════════════════
   PRODUCTS (white section)
   ══════════════════════════════════════════════════════════ */
.products { padding:88px 0; }
.products-head { text-align:center; margin-bottom:52px; }
.products-grid {
  display:grid; grid-template-columns:1fr 1fr; gap:36px;
}
.product-card {
  background:var(--kdx-white); border-radius:var(--r-sm);
  overflow:hidden;
  box-shadow:0 4px 20px rgba(0,0,0,.08);
  transition:transform .3s, box-shadow .3s;
}
.product-card:hover {
  transform:translateY(-6px);
  box-shadow:0 20px 48px rgba(0,0,0,.14);
}
.product-card-img {
  aspect-ratio:16/10; overflow:hidden;
  border-radius:var(--r-sm) var(--r-sm) 0 0;
}
.product-card-img img { width:100%; height:100%; object-fit:cover; transition:transform .5s; }
.product-card:hover .product-card-img img { transform:scale(1.04); }
.product-card-body { padding:28px 30px 32px; }
.product-card-body h3 {
  font-size:20px; font-weight:600; color:var(--kdx-purple);
  text-transform:uppercase; margin-bottom:10px;
}
.product-card-body p {
  font-size:14.5px; color:var(--kdx-gray-600); line-height:1.7; margin-bottom:18px;
}
.card-link {
  color:var(--kdx-orange); font-weight:600; font-size:13px;
  letter-spacing:1px; border-bottom:2px solid var(--kdx-orange); padding-bottom:3px;
}
.card-link:hover { color:var(--kdx-orange-burnt); }

/* ══════════════════════════════════════════════════════════
   WHY US (purple section, split layout)
   ══════════════════════════════════════════════════════════ */
.why {
  background:linear-gradient(135deg, var(--kdx-purple-dark) 0%, var(--kdx-purple) 100%);
  color:var(--kdx-white); padding:88px 0; overflow:hidden;
}
.why-grid {
  max-width:var(--max-w); margin:0 auto; padding:0 48px;
  display:grid; grid-template-columns:1fr 1fr; gap:64px; align-items:center;
}
.why-img {
  aspect-ratio:4/3; overflow:hidden; border-radius:var(--r-sm);
  box-shadow:0 20px 60px rgba(0,0,0,.3);
}
.why-img img { width:100%; height:100%; object-fit:cover; }
.why-title {
  font-size:clamp(24px,3.5vw,34px); font-weight:600; margin-bottom:8px;
  text-transform:uppercase;
}
.why-subtitle { font-size:15px; opacity:.65; margin-bottom:32px; }
.why-list { display:flex; flex-direction:column; gap:18px; }
.why-item { display:flex; gap:14px; font-size:15px; line-height:1.6; }
.why-marker { color:var(--kdx-orange); font-weight:700; flex-shrink:0; font-size:18px; }

/* ══════════════════════════════════════════════════════════
   STATS (icon cards)
   ══════════════════════════════════════════════════════════ */
.stats { padding:64px 0; background:var(--kdx-white); }
.stats-grid {
  display:grid; grid-template-columns:repeat(3,1fr); gap:32px;
  max-width:var(--max-w); margin:0 auto; padding:0 48px;
}
.stat-card {
  background:var(--kdx-white); border-radius:var(--r-sm);
  box-shadow:0 4px 20px rgba(0,0,0,.07);
  padding:40px 32px; text-align:center;
  transition:transform .3s, box-shadow .3s;
  color:var(--kdx-purple);
}
.stat-card:hover { transform:translateY(-4px); box-shadow:0 12px 36px rgba(0,0,0,.12); }
.stat-icon {
  width:56px; height:56px; margin:0 auto 18px;
}
.stat-icon img { width:100%; height:100%; object-fit:contain; }
.stat-card h3 { font-size:40px; font-weight:600; line-height:1.15; margin-bottom:10px; }
.stat-card p  { font-size:13.5px; opacity:.8; line-height:1.65; }

/* ══════════════════════════════════════════════════════════
   TESTIMONIALS (purple, 2-col grid)
   ══════════════════════════════════════════════════════════ */
.testimonials {
  background:linear-gradient(180deg, var(--kdx-purple) 0%, var(--kdx-purple-dark) 100%);
  color:var(--kdx-white); padding:88px 0;
}
.testimonials-head { text-align:center; margin-bottom:52px; }
.testimonials-label {
  display:block; font-size:12px; font-weight:700; letter-spacing:2.5px;
  color:var(--kdx-orange); margin-bottom:10px;
}
.testimonials-title {
  font-size:clamp(24px,3.5vw,34px); font-weight:600;
  text-transform:uppercase;
}
.testimonials-grid {
  display:grid; grid-template-columns:1fr 1fr; gap:28px;
  max-width:var(--max-w); margin:0 auto; padding:0 48px;
}
.testimonial-card {
  background:rgba(255,255,255,.05); border:1px solid rgba(255,255,255,.1);
  border-radius:var(--r-sm); padding:36px 32px; text-align:center;
  backdrop-filter:blur(4px); transition:background .3s;
}
.testimonial-card:hover { background:rgba(255,255,255,.09); }
.testimonial-role {
  font-size:18px; font-weight:500; margin-bottom:14px; line-height:1.4;
  color:var(--kdx-orange);
}
.testimonial-text {
  font-size:14.5px; line-height:1.85; opacity:.82; margin-bottom:22px;
  font-style:italic;
}
.testimonial-author { font-size:13px; font-weight:700; color:var(--kdx-orange); margin-bottom:4px; }
.testimonial-meta  { font-size:12.5px; opacity:.55; }

/* ══════════════════════════════════════════════════════════
   NEWS (light-blue band)
   ══════════════════════════════════════════════════════════ */
.news { background:var(--kdx-blue); padding:88px 0; }
.news-head { margin-bottom:52px; }
.news-title {
  font-size:clamp(24px,3.5vw,34px); font-weight:600;
  color:var(--kdx-purple); text-transform:uppercase; margin-bottom:12px;
}
.news-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:30px; }
.news-card {
  background:var(--kdx-white); border-radius:var(--r-sm);
  overflow:hidden;
  box-shadow:0 4px 16px rgba(0,0,0,.07);
  transition:transform .3s, box-shadow .3s;
}
.news-card:hover { transform:translateY(-5px); box-shadow:0 14px 36px rgba(0,0,0,.13); }
.news-card-img { aspect-ratio:16/10; overflow:hidden; }
.news-card-img img { width:100%; height:100%; object-fit:cover; transition:transform .5s; }
.news-card:hover .news-card-img img { transform:scale(1.04); }
.news-card-body { padding:22px 24px 26px; }
.news-date {
  font-size:12px; font-weight:700; color:var(--kdx-orange);
  letter-spacing:1px; margin-bottom:8px;
}
.news-card-body h4 {
  font-size:16px; color:var(--kdx-purple); line-height:1.45; margin-bottom:8px;
}
.news-card-body p { font-size:13.5px; color:var(--kdx-gray-600); line-height:1.65; }

/* ══════════════════════════════════════════════════════════
   PARTNERS (dark gradient)
   ══════════════════════════════════════════════════════════ */
.partners {
  background:linear-gradient(180deg, var(--kdx-purple-deeper) 0%, var(--kdx-purple) 100%);
  color:var(--kdx-white); padding:88px 0;
}
.partners-head { margin-bottom:52px; }
.partners-title {
  font-size:clamp(24px,3.5vw,34px); font-weight:600;
  text-transform:uppercase; margin-bottom:12px;
}
.partners-sub { font-size:15px; opacity:.65; line-height:1.75; max-width:620px; }
.partners-grid {
  display:grid; grid-template-columns:repeat(4,1fr); gap:24px;
}
.partner-card {
  background:rgba(255,255,255,.06); border:1px solid rgba(255,255,255,.1);
  border-radius:var(--r-sm); padding:32px 24px; text-align:center;
  transition:background .3s, transform .3s;
}
.partner-card:hover { background:rgba(255,255,255,.11); transform:translateY(-4px); }
.partner-logo {
  height:60px; display:flex; align-items:center; justify-content:center;
  margin-bottom:18px;
}
.partner-logo-placeholder {
  font-size:20px; font-weight:700; color:var(--kdx-orange); letter-spacing:1px;
}
.partner-card h4 { font-size:15px; font-weight:600; margin-bottom:8px; }
.partner-card p  { font-size:12.5px; opacity:.65; line-height:1.65; margin-bottom:16px; }
.partner-link {
  color:var(--kdx-orange); font-size:12.5px; font-weight:600;
  border-bottom:1px solid var(--kdx-orange); padding-bottom:2px;
}
.partner-link:hover { color:var(--kdx-orange-burnt); }

/* ══════════════════════════════════════════════════════════
   CTA BAND
   ══════════════════════════════════════════════════════════ */
.cta-band {
  background:var(--kdx-purple-deeper); color:var(--kdx-white);
  padding:80px 0; text-align:center;
}
.cta-band h2 {
  font-size:clamp(22px,3vw,32px); font-weight:600; margin-bottom:14px;
}
.cta-band p {
  font-size:15px; opacity:.65; max-width:580px; margin:0 auto 32px; line-height:1.75;
}

/* ══════════════════════════════════════════════════════════
   FOOTER — radial gradient per Kaleidex theme
   ══════════════════════════════════════════════════════════ */
.site-footer {
  background:var(--kdx-purple-dark);
  background-image:radial-gradient(ellipse at bottom -30% left 15vw, var(--kdx-orange) 0%, var(--kdx-purple) 42%);
  color:rgba(255,255,255,.65); padding:72px 0 28px;
}
.footer-grid {
  display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:44px;
  max-width:var(--max-w); margin:0 auto; padding:0 48px;
  margin-bottom:44px;
}
.footer-brand h3 {
  font-size:18px; font-weight:700; color:var(--kdx-white); margin-bottom:14px;
}
.footer-brand p { font-size:13.5px; line-height:1.75; }
.footer-col h4 {
  font-size:13px; font-weight:700; color:var(--kdx-white);
  margin-bottom:18px; letter-spacing:.5px;
}
.footer-col ul li { margin-bottom:9px; }
.footer-col ul li a { color:rgba(255,255,255,.6); font-size:13.5px; }
.footer-col ul li a:hover { color:var(--kdx-orange); }
.footer-bottom {
  border-top:1px solid rgba(255,255,255,.1);
  max-width:var(--max-w); margin:0 auto; padding:22px 48px 0;
  display:flex; justify-content:space-between; align-items:center;
  font-size:12px; opacity:.55; flex-wrap:wrap; gap:8px;
}

/* ══════════════════════════════════════════════════════════
   PRODUCT PAGE HERO
   ══════════════════════════════════════════════════════════ */
.product-hero {
  background:linear-gradient(135deg, var(--kdx-purple) 0%, var(--kdx-purple-dark) 100%);
  color:var(--kdx-white); padding:72px 0 60px;
}
.product-hero-inner { max-width:var(--max-w); margin:0 auto; padding:0 48px; }

/* breadcrumb */
.breadcrumb {
  padding:14px 0; font-size:13.5px; color:var(--kdx-gray-600);
  max-width:var(--max-w); margin:0 auto; padding-left:48px;
}
.breadcrumb a { color:var(--kdx-purple); }
.breadcrumb a:hover { color:var(--kdx-orange); }
.breadcrumb span { margin:0 8px; opacity:.4; }

/* product detail grid */
.pd-grid {
  display:grid; grid-template-columns:1fr 1fr; gap:52px; align-items:start;
}
.pd-grid.reverse { direction:rtl; }
.pd-grid.reverse > * { direction:ltr; }

.pd-text h3 { font-size:20px; color:var(--kdx-purple); margin-bottom:14px; text-transform:uppercase; }
.pd-text p  { color:var(--kdx-gray-600); line-height:1.85; margin-bottom:14px; font-size:15px; }

.pd-img {
  aspect-ratio:4/3; overflow:hidden; border-radius:var(--r-sm);
  box-shadow:0 12px 40px rgba(0,0,0,.1);
}
.pd-img img { width:100%; height:100%; object-fit:cover; }

/* shapes grid */
.shapes-grid {
  display:grid; grid-template-columns:repeat(3,1fr); gap:24px; margin-top:32px;
}
.shape-card {
  text-align:center; padding:32px 20px;
  background:var(--kdx-gray-50); border-radius:var(--r-sm);
  border:1px solid var(--kdx-gray-100);
  transition:transform .3s, box-shadow .3s;
}
.shape-card:hover { transform:translateY(-4px); box-shadow:0 12px 28px rgba(0,0,0,.08); }
.shape-icon {
  width:72px; height:52px; margin:0 auto 14px;
  background:var(--kdx-white); border-radius:8px;
  display:flex; align-items:center; justify-content:center;
  font-size:32px; color:var(--kdx-purple);
  box-shadow:0 2px 8px rgba(0,0,0,.05);
}
.shape-card h4 { font-size:15px; color:var(--kdx-purple); margin-bottom:6px; }
.shape-card p  { font-size:12.5px; color:var(--kdx-gray-600); }

/* pitch chips */
.pitch-grid {
  display:flex; flex-wrap:wrap; gap:10px; margin-top:28px; justify-content:center;
}
.pitch-chip {
  background:var(--kdx-white); border:1px solid var(--kdx-gray-200);
  border-radius:9999px; padding:9px 20px;
  font-size:13.5px; font-weight:600; color:var(--kdx-purple);
  transition:all .25s; cursor:default;
}
.pitch-chip:hover { background:var(--kdx-purple); color:var(--kdx-white); border-color:var(--kdx-purple); }

/* specs table */
.specs-table {
  width:100%; border-collapse:collapse; margin-top:28px;
  max-width:720px; margin-left:auto; margin-right:auto;
}
.specs-table th, .specs-table td { padding:14px 22px; border:1px solid var(--kdx-gray-200); font-size:14px; text-align:left; }
.specs-table th { background:var(--kdx-purple); color:var(--kdx-white); font-weight:600; font-size:12.5px; letter-spacing:1px; text-transform:uppercase; }
.specs-table td { background:var(--kdx-white); }
.specs-table tr:nth-child(even) td { background:var(--kdx-gray-50); }

/* apps grid */
.apps-grid {
  display:grid; grid-template-columns:repeat(4,1fr); gap:22px; margin-top:32px;
}
.app-card {
  text-align:center; padding:30px 18px;
  background:var(--kdx-gray-50); border-radius:var(--r-sm);
  border:1px solid var(--kdx-gray-100);
  transition:transform .3s;
}
.app-card:hover { transform:translateY(-4px); }
.app-icon {
  width:50px; height:50px; background:var(--kdx-purple);
  color:var(--kdx-orange); display:flex; align-items:center; justify-content:center;
  font-size:22px; border-radius:50%; margin:0 auto 12px; font-weight:700;
}
.app-card h4 { font-size:14.5px; color:var(--kdx-purple); margin-bottom:6px; }
.app-card p  { font-size:12.5px; color:var(--kdx-gray-600); line-height:1.6; }

/* contact grid */
.contact-grid {
  display:grid; grid-template-columns:1fr 1fr; gap:52px; align-items:start;
}
.contact-item {
  display:flex; gap:16px; align-items:flex-start; margin-bottom:22px;
}
.contact-icon {
  width:40px; height:40px; background:var(--kdx-purple); color:var(--kdx-orange);
  display:flex; align-items:center; justify-content:center;
  border-radius:50%; font-size:17px; flex-shrink:0;
}
.contact-item h4 { font-size:13.5px; color:var(--kdx-purple); margin-bottom:4px; }
.contact-item p  { font-size:13.5px; color:var(--kdx-gray-600); line-height:1.6; }

.contact-form-box {
  background:var(--kdx-gray-50); padding:34px; border-radius:var(--r-sm);
  border:1px solid var(--kdx-gray-100);
}
.contact-form-box h3 { font-size:19px; color:var(--kdx-purple); margin-bottom:24px; }
.form-group { margin-bottom:16px; }
.form-group label { display:block; font-size:13.5px; color:var(--kdx-gray-800); margin-bottom:6px; font-weight:500; }
.form-group label .req { color:var(--kdx-orange); }
.form-group input, .form-group select, .form-group textarea {
  width:100%; padding:11px 16px; border:1px solid var(--kdx-gray-200);
  border-radius:6px; font-size:14px; font-family:inherit; background:var(--kdx-white);
  transition:border-color .25s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color:var(--kdx-orange); outline:none; }

/* back-to-top */
.back-to-top {
  position:fixed; bottom:26px; right:26px;
  width:44px; height:44px; background:var(--kdx-purple); color:var(--kdx-white);
  border:none; border-radius:50%; cursor:pointer; font-size:18px;
  display:flex; align-items:center; justify-content:center;
  opacity:0; visibility:hidden; transition:opacity .3s, visibility .3s, background .25s;
  z-index:999; box-shadow:0 4px 16px rgba(0,0,0,.2);
}
.back-to-top.visible { opacity:1; visibility:visible; }
.back-to-top:hover { background:var(--kdx-orange); color:var(--kdx-white); }

/* ══════════════════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════════════════ */
@media (max-width:900px) {
  .main-nav { display:none; }
  .mobile-toggle { display:flex; }
  .hero-grid { grid-template-columns:1fr; padding:72px 28px 60px; }
  .hero-media { display:none; }
  .brand-band-grid { grid-template-columns:1fr; text-align:center; }
  .brand-band-logo { max-width:160px; margin:0 auto; }
  .products-grid { grid-template-columns:1fr; }
  .why-grid { grid-template-columns:1fr; gap:36px; }
  .why-img { order:-1; }
  .stats-grid { grid-template-columns:1fr; }
  .testimonials-grid { grid-template-columns:1fr; }
  .news-grid { grid-template-columns:1fr; }
  .partners-grid { grid-template-columns:1fr 1fr; }
  .footer-grid { grid-template-columns:1fr 1fr; }
  .shapes-grid { grid-template-columns:1fr 1fr; }
  .apps-grid   { grid-template-columns:1fr 1fr; }
  .pd-grid, .contact-grid { grid-template-columns:1fr; }
  .pd-grid.reverse { direction:ltr; }
  .title-xl { font-size:28px; }
  .container, .hero-grid, .brand-band-grid, .why-grid, .stats-grid, .testimonials-grid, .news-head, .partners-head, .footer-grid, .footer-bottom, .product-hero-inner, .breadcrumb { padding-left:28px !important; padding-right:28px !important; }
}

@media (max-width:540px) {
  .partners-grid { grid-template-columns:1fr; }
  .shapes-grid { grid-template-columns:1fr; }
  .apps-grid   { grid-template-columns:1fr; }
  .footer-grid { grid-template-columns:1fr; }
  .stat-card h3 { font-size:32px; }
  .header-inner { padding:0 20px; }
  .hero-btns { flex-direction:column; }
  .hero-btns .btn { text-align:center; }
}