/* ==========================================================================
   FOTON HDT — design system
   Industrial / engineered aesthetic. System fonts only (no external CDN).
   ========================================================================== */

/* 1. Tokens ---------------------------------------------------------------- */
:root {
  /* colour */
  --ink:        #0a1020;
  --ink-2:      #111a2e;
  --steel:      #1d2942;
  --slate:      #5a6a85;
  --slate-2:    #8494ab;
  --line:       #e3e8ef;
  --line-2:     #eef2f7;
  --bg:         #ffffff;
  --bg-soft:    #f6f8fb;
  --bg-dark:    #0a1020;

  --brand:      #0b4fa8;
  --brand-2:    #0a3f86;
  --brand-soft: #eaf1fb;
  --brand-line: #c9dcf5;
  --accent:     #d81e28;
  --accent-soft:#fdeceD;

  /* type */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB",
               "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
               "Liberation Mono", monospace;

  --fs-xs:   0.78rem;
  --fs-sm:   0.875rem;
  --fs-base: 1rem;
  --fs-lg:   1.125rem;
  --fs-xl:   1.375rem;
  --fs-2xl:  1.75rem;
  --fs-3xl:  2.25rem;
  --fs-4xl:  clamp(2.1rem, 1.2rem + 3.6vw, 3.4rem);
  --fs-5xl:  clamp(2.5rem, 1.2rem + 5vw, 4.2rem);

  /* space */
  --sp-1: 0.25rem;  --sp-2: 0.5rem;   --sp-3: 0.75rem;  --sp-4: 1rem;
  --sp-5: 1.5rem;   --sp-6: 2rem;     --sp-7: 3rem;     --sp-8: 4rem;
  --sp-9: 6rem;

  --container: 1200px;
  --radius:    10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(10, 16, 32, .06);
  --shadow:    0 6px 20px rgba(10, 16, 32, .08);
  --shadow-lg: 0 18px 48px rgba(10, 16, 32, .14);
  --ring:      0 0 0 3px rgba(11, 79, 168, .28);

  --header-h: 72px;
}

/* 2. Reset ----------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden; /* safety net against accidental track blow-out */
}
img, svg { max-width: 100%; display: block; }
/* grid/flex children must be allowed to shrink below their content width */
.hero-copy, .hero-art, .card, .card-body, .product-layout > *, .contact-grid > *, .footer-grid > * { min-width: 0; }
a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-2); }
h1, h2, h3, h4 { margin: 0 0 var(--sp-3); line-height: 1.2; font-weight: 700; letter-spacing: -0.015em; }
h1 { font-size: var(--fs-4xl); }
h2 { font-size: var(--fs-3xl); }
h3 { font-size: var(--fs-xl); }
h4 { font-size: var(--fs-base); }
p  { margin: 0 0 var(--sp-4); }
ul, ol { margin: 0; padding: 0; }
button { font: inherit; cursor: pointer; }
:focus-visible { outline: none; box-shadow: var(--ring); border-radius: 6px; }
::selection { background: var(--brand); color: #fff; }

/* 3. Layout ---------------------------------------------------------------- */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--sp-5); }
.section { padding-block: var(--sp-9); }
.section--soft { background: var(--bg-soft); }
.section--tight { padding-block: var(--sp-7); }
.section-head { max-width: 760px; margin-bottom: var(--sp-7); }
.section-head--center { margin-inline: auto; text-align: center; }
.eyebrow {
  display: inline-flex; align-items: center; gap: var(--sp-2);
  font-size: var(--fs-xs); font-weight: 700; letter-spacing: .14em;
  text-transform: uppercase; color: var(--brand); margin: 0 0 var(--sp-3);
}
.eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--accent); display: block; }
.section--dark .eyebrow { color: #9dc0ef; }
.lead { font-size: var(--fs-lg); color: var(--slate); }
.section-lead { font-size: var(--fs-lg); color: var(--slate); margin: 0; }

.grid { display: grid; gap: var(--sp-5); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* 4. Buttons --------------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--sp-2);
  padding: 0.78rem 1.5rem; border-radius: 8px; border: 1px solid transparent;
  font-weight: 600; font-size: var(--fs-sm); letter-spacing: .01em;
  transition: transform .15s ease, background-color .15s ease, border-color .15s ease, color .15s ease, box-shadow .15s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-sm { padding: 0.55rem 1rem; font-size: var(--fs-xs); }
.btn-lg { padding: 0.95rem 1.9rem; font-size: var(--fs-base); }
.btn-primary { background: var(--brand); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--brand-2); color: #fff; box-shadow: var(--shadow); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: #b8171f; color: #fff; }
.btn-ghost { border-color: rgba(255,255,255,.32); color: #fff; background: rgba(255,255,255,.06); }
.btn-ghost:hover { background: rgba(255,255,255,.14); color: #fff; border-color: rgba(255,255,255,.5); }
.btn-outline { border-color: var(--line); color: var(--ink); background: #fff; }
.btn-outline:hover { border-color: var(--brand); color: var(--brand); }
.btn-light { background: #fff; color: var(--ink); }
.btn-light:hover { background: #eef3fa; color: var(--ink); }
.link-arrow { font-weight: 600; font-size: var(--fs-sm); display: inline-flex; align-items: center; gap: .4rem; }
.link-arrow::after { content: "→"; transition: transform .15s ease; }
.link-arrow:hover::after { transform: translateX(3px); }

/* 5. Header ---------------------------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 60;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; gap: var(--sp-5); min-height: var(--header-h); }
.brand { display: flex; align-items: center; gap: .7rem; color: var(--ink); }
.brand:hover { color: var(--ink); }
.brand-mark {
  width: 40px; height: 40px; border-radius: 8px; flex: none;
  background: linear-gradient(135deg, var(--brand) 0%, #0a3f86 100%);
  color: #fff; font-size: .72rem; font-weight: 800; letter-spacing: .04em;
  display: grid; place-items: center;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text strong { font-size: .98rem; letter-spacing: .02em; }
.brand-text small { font-size: .7rem; color: var(--slate); letter-spacing: .04em; }
.nav { display: flex; align-items: center; gap: var(--sp-1); margin-left: auto; }
.nav-link {
  padding: .5rem .8rem; border-radius: 7px; font-size: var(--fs-sm); font-weight: 600;
  color: var(--steel); white-space: nowrap;
}
.nav-link:hover { background: var(--bg-soft); color: var(--brand); }
.nav-link.is-active { color: var(--brand); background: var(--brand-soft); }
.header-actions { display: flex; align-items: center; gap: var(--sp-3); }
.lang-switch {
  font-size: var(--fs-xs); font-weight: 700; letter-spacing: .06em;
  border: 1px solid var(--line); border-radius: 7px; padding: .42rem .7rem; color: var(--steel);
}
.lang-switch:hover { border-color: var(--brand); color: var(--brand); }
.nav-toggle {
  display: none; width: 42px; height: 42px; border: 1px solid var(--line);
  border-radius: 8px; background: #fff; position: relative;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  position: absolute; left: 50%; width: 18px; height: 2px; background: var(--ink);
  transform: translateX(-50%); content: "";
}
.nav-toggle span { top: 50%; margin-top: -1px; }
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }

/* 6. Hero ------------------------------------------------------------------ */
.hero {
  position: relative; overflow: hidden; color: #fff;
  background: var(--ink);
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background-size: cover; background-position: center 62%;
  transform: scale(1.02);
}
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: 1; pointer-events: none;
  background: linear-gradient(95deg,
    rgba(6,10,20,.94) 0%, rgba(6,10,20,.86) 34%,
    rgba(6,10,20,.55) 62%, rgba(6,10,20,.35) 100%);
}
.hero::after {
  content: ""; position: absolute; inset: 0; z-index: 1; pointer-events: none; opacity: .3;
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, #000 0%, transparent 78%);
}
.hero-inner {
  position: relative; z-index: 2;
  padding-block: var(--sp-9) var(--sp-8);
}
.hero-copy { max-width: 680px; }
.hero-copy h1 { color: #fff; margin-bottom: var(--sp-4); text-shadow: 0 2px 24px rgba(0,0,0,.4); }
.hero-copy .lead { color: #c3d0e2; max-width: 56ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--sp-3); margin-top: var(--sp-5); }
.hero-supply {
  margin-top: var(--sp-6); padding-top: var(--sp-4);
  border-top: 1px solid rgba(255,255,255,.16);
  font-size: var(--fs-sm); color: #c7d4e6; letter-spacing: .01em; max-width: 62ch;
}
.hero-stats { position: relative; z-index: 2; border-top: 1px solid rgba(255,255,255,.12); background: rgba(6,10,20,.55); }
.stats-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.stat { padding: var(--sp-5) var(--sp-4); border-left: 1px solid rgba(255,255,255,.1); }
.stat:first-child { border-left: 0; }
.stat b { display: block; font-size: var(--fs-2xl); font-weight: 800; letter-spacing: -.02em; }
.stat span { font-size: var(--fs-xs); color: #9fb0c8; letter-spacing: .04em; }

/* 7. Trust bar ------------------------------------------------------------- */
.trust-bar { background: var(--bg-soft); border-bottom: 1px solid var(--line); }
.trust-list {
  display: flex; flex-wrap: wrap; gap: var(--sp-3) var(--sp-6);
  padding-block: var(--sp-4); font-size: var(--fs-sm); color: var(--steel); font-weight: 600;
}
.trust-list li { list-style: none; display: flex; align-items: center; gap: .5rem; }
.trust-list li::before {
  content: ""; width: 6px; height: 6px; background: var(--accent); border-radius: 1px; transform: rotate(45deg);
}

/* 8. Cards ----------------------------------------------------------------- */
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  overflow: hidden; transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
  display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--brand-line); }
.card-body { padding: var(--sp-5); display: flex; flex-direction: column; gap: var(--sp-3); flex: 1; }
.card-body h3 { margin: 0; font-size: var(--fs-lg); }
.card-body p { margin: 0; color: var(--slate); font-size: var(--fs-sm); }
.model-media {
  position: relative; aspect-ratio: 16 / 9; overflow: hidden;
  background: var(--bg-soft); border-bottom: 1px solid var(--line);
}
.model-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.card:hover .model-media img { transform: scale(1.045); }
.badge {
  position: absolute; top: var(--sp-3); left: var(--sp-3);
  background: var(--ink); color: #fff; font-size: var(--fs-xs); font-weight: 700;
  letter-spacing: .06em; text-transform: uppercase; padding: .3rem .6rem; border-radius: 5px;
}
.model-power { font-family: var(--font-mono); font-size: var(--fs-xs); color: var(--brand); font-weight: 600; letter-spacing: -.01em; }
.chip-list { list-style: none; display: flex; flex-wrap: wrap; gap: .4rem; }
.chip {
  font-size: var(--fs-xs); color: var(--steel); background: var(--bg-soft);
  border: 1px solid var(--line); border-radius: 999px; padding: .22rem .6rem;
}
.card-cta { margin-top: auto; padding-top: var(--sp-2); }

.feature-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--sp-5); }
.feature {
  background: #fff; border: 1px solid var(--line); border-left: 3px solid var(--brand);
  border-radius: var(--radius); padding: var(--sp-5);
}
.feature h3 { font-size: var(--fs-base); margin-bottom: var(--sp-2); }
.feature p { margin: 0; color: var(--slate); font-size: var(--fs-sm); }
.feature-num { font-family: var(--font-mono); font-size: var(--fs-xs); color: var(--slate-2); display: block; margin-bottom: var(--sp-2); }

.service-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: var(--sp-6); }
.service-card h3 { margin-bottom: var(--sp-3); }
.service-card > p { color: var(--slate); font-size: var(--fs-sm); }
.tick-list { list-style: none; display: grid; gap: var(--sp-2); margin-top: var(--sp-4); }
.tick-list li { position: relative; padding-left: 1.5rem; font-size: var(--fs-sm); color: var(--steel); }
.tick-list li::before {
  content: ""; position: absolute; left: 0; top: .52em; width: 12px; height: 7px;
  border-left: 2px solid var(--brand); border-bottom: 2px solid var(--brand); transform: rotate(-45deg);
}

.app-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: var(--sp-5); }
.app-card h3 { font-size: var(--fs-base); display: flex; align-items: center; gap: .55rem; }
.app-card h3::before {
  content: ""; width: 10px; height: 10px; background: var(--accent); border-radius: 2px; flex: none;
}
.app-card p { margin: 0; color: var(--slate); font-size: var(--fs-sm); }

/* 9. Steps ----------------------------------------------------------------- */
.steps { list-style: none; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--sp-5); counter-reset: step; }
.step { position: relative; padding-top: var(--sp-5); border-top: 2px solid var(--line); }
.step::before {
  counter-increment: step; content: "0" counter(step);
  position: absolute; top: -1px; left: 0; transform: translateY(-50%);
  background: var(--brand); color: #fff; font-family: var(--font-mono); font-size: var(--fs-xs);
  font-weight: 700; padding: .18rem .5rem; border-radius: 4px;
}
.step h3 { font-size: var(--fs-base); margin-bottom: var(--sp-2); }
.step p { margin: 0; font-size: var(--fs-sm); color: var(--slate); }

/* 10. Spec table ----------------------------------------------------------- */
.spec-table { width: 100%; border-collapse: collapse; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.spec-table th, .spec-table td { padding: .8rem 1rem; text-align: left; font-size: var(--fs-sm); border-bottom: 1px solid var(--line-2); vertical-align: top; }
.spec-table th { width: 40%; background: var(--bg-soft); color: var(--steel); font-weight: 600; }
.spec-table td { color: var(--ink); }
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: 0; }
.spec-table td { font-family: var(--font-mono); font-size: var(--fs-xs); }
.spec-note { font-size: var(--fs-xs); color: var(--slate); margin-top: var(--sp-3); }

/* 11. FAQ ------------------------------------------------------------------ */
.faq { display: grid; gap: var(--sp-3); }
.faq-item { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.faq-item summary {
  cursor: pointer; padding: var(--sp-4) var(--sp-5); font-weight: 600; font-size: var(--fs-base);
  display: flex; justify-content: space-between; align-items: center; gap: var(--sp-4); list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; font-size: var(--fs-xl); color: var(--brand); line-height: 1; }
.faq-item[open] summary::after { content: "−"; }
.faq-item[open] summary { border-bottom: 1px solid var(--line-2); background: var(--bg-soft); }
.faq-body { padding: var(--sp-4) var(--sp-5); }
.faq-body p { margin: 0; color: var(--slate); font-size: var(--fs-sm); }

/* 12. CTA band ------------------------------------------------------------- */
.cta-band {
  color: #fff;
  background:
    radial-gradient(900px 400px at 86% 120%, rgba(216,30,40,.35), transparent 60%),
    linear-gradient(120deg, #0a3f86 0%, #0b4fa8 55%, #0a1020 100%);
}
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: var(--sp-6); padding-block: var(--sp-7); }
.cta-inner h2 { color: #fff; margin-bottom: var(--sp-2); max-width: 26ch; }
.cta-inner p { margin: 0; color: #cfe0f5; max-width: 60ch; }

/* 13. Page header ---------------------------------------------------------- */
.page-head { background: var(--bg-soft); border-bottom: 1px solid var(--line); padding-block: var(--sp-7); }
.breadcrumb { font-size: var(--fs-xs); color: var(--slate); margin-bottom: var(--sp-3); display: flex; gap: .45rem; flex-wrap: wrap; }
.breadcrumb a { color: var(--slate); }
.breadcrumb a:hover { color: var(--brand); }
.page-head h1 { margin-bottom: var(--sp-3); }
.page-head .lead { margin: 0; max-width: 70ch; }

/* 14. Product detail ------------------------------------------------------- */
.product-layout { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); gap: var(--sp-7); align-items: start; }
.product-visual { background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden; }
.product-visual img { width: 100%; height: auto; aspect-ratio: 16 / 9; object-fit: cover; }
.gallery { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--sp-4); }
.gallery img { width: 100%; height: auto; aspect-ratio: 16 / 9; object-fit: cover; border-radius: var(--radius); border: 1px solid var(--line); background: #fff; }
.product-meta { display: flex; flex-wrap: wrap; gap: var(--sp-3); margin-bottom: var(--sp-5); }
.meta-pill { font-family: var(--font-mono); font-size: var(--fs-xs); background: var(--brand-soft); color: var(--brand-2); border: 1px solid var(--brand-line); border-radius: 999px; padding: .28rem .7rem; }
.spec-panel { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: var(--sp-5); }
.spec-panel h3 { font-size: var(--fs-base); text-transform: uppercase; letter-spacing: .1em; font-size: var(--fs-xs); color: var(--slate); }
.quote-box { background: var(--bg-soft); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: var(--sp-5); }
.quote-box h3 { font-size: var(--fs-lg); }

/* 15. Forms ---------------------------------------------------------------- */
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--sp-4); }
.field { display: flex; flex-direction: column; gap: .35rem; }
.field--full { grid-column: 1 / -1; }
.field label { font-size: var(--fs-xs); font-weight: 700; letter-spacing: .04em; color: var(--steel); text-transform: uppercase; }
.field input, .field select, .field textarea {
  font: inherit; font-size: var(--fs-sm); padding: .7rem .85rem;
  border: 1px solid var(--line); border-radius: 8px; background: #fff; color: var(--ink); width: 100%;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--brand); box-shadow: var(--ring); }
.field textarea { min-height: 130px; resize: vertical; }
.form-note { font-size: var(--fs-xs); color: var(--slate); }
.form-status { margin-top: var(--sp-4); font-size: var(--fs-sm); font-weight: 600; display: none; }
.form-status.is-visible { display: block; }
.form-status.is-ok { color: #137a4b; }
.form-status.is-warn { color: #a15c00; }

/* 16. Contact & misc ------------------------------------------------------- */
.contact-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); gap: var(--sp-7); align-items: start; }
.contact-item { display: flex; gap: var(--sp-3); padding-block: var(--sp-4); border-bottom: 1px solid var(--line-2); }
.contact-item:first-child { padding-top: 0; }
.contact-item .k { font-size: var(--fs-xs); text-transform: uppercase; letter-spacing: .08em; color: var(--slate); min-width: 92px; font-weight: 700; }
.contact-item .v { font-size: var(--fs-sm); color: var(--ink); word-break: break-word; }
.contact-item .v a { color: var(--ink); }
.contact-item .v a:hover { color: var(--brand); }
.info-box { background: var(--brand-soft); border: 1px solid var(--brand-line); border-radius: var(--radius); padding: var(--sp-5); }
.info-box h3 { font-size: var(--fs-base); }
.info-box p { margin: 0; font-size: var(--fs-sm); color: var(--steel); }

/* 17. Footer --------------------------------------------------------------- */
.site-footer { background: var(--bg-dark); color: #93a2b8; padding-top: var(--sp-8); font-size: var(--fs-sm); }
.footer-grid { display: grid; grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, 1fr)); gap: var(--sp-6); padding-bottom: var(--sp-7); }
.site-footer h4 { color: #fff; font-size: var(--fs-xs); text-transform: uppercase; letter-spacing: .12em; margin-bottom: var(--sp-4); }
.site-footer ul { list-style: none; display: grid; gap: .55rem; }
.site-footer a { color: #93a2b8; }
.site-footer a:hover { color: #fff; }
.footer-brand .brand-text strong { color: #fff; }
.footer-brand .brand-text small { color: #7f8ea6; }
.footer-brand p { margin-top: var(--sp-4); max-width: 40ch; }
.footer-legal { border-top: 1px solid rgba(255,255,255,.1); padding-block: var(--sp-5); display: grid; gap: var(--sp-3); }
.disclaimer { font-size: var(--fs-xs); color: #76869c; line-height: 1.7; margin: 0; }
.copyright { font-size: var(--fs-xs); color: #6b7a90; margin: 0; display: flex; justify-content: space-between; gap: var(--sp-4); flex-wrap: wrap; }

/* 17b. Floating WhatsApp ---------------------------------------------------- */
.wa-float {
  position: fixed; right: 20px; bottom: 20px; z-index: 80;
  width: 56px; height: 56px; border-radius: 50%;
  background: #25d366; color: #fff;
  display: grid; place-items: center;
  box-shadow: 0 10px 26px rgba(37, 211, 102, .40);
  transition: transform .18s ease, box-shadow .18s ease;
}
.wa-float:hover { transform: scale(1.07); color: #fff; box-shadow: 0 14px 32px rgba(37, 211, 102, .5); }
.wa-float svg { width: 30px; height: 30px; }
@media (max-width: 640px) {
  .wa-float { right: 12px; bottom: 12px; width: 50px; height: 50px; }
  .wa-float svg { width: 26px; height: 26px; }
}

/* 18. Utilities ------------------------------------------------------------ */
.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }
.text-center { text-align: center; }
.nowrap { white-space: nowrap; }
.skip-link {
  position: absolute; left: -9999px; top: 0; background: var(--brand); color: #fff;
  padding: .6rem 1rem; border-radius: 0 0 8px 0; z-index: 100;
}
.skip-link:focus { left: 0; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* 19. Responsive ----------------------------------------------------------- */
@media (max-width: 1080px) {
  .hero-inner { padding-block: var(--sp-8) var(--sp-7); }
  .hero-bg { background-position: center 68%; }
  .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .product-layout { grid-template-columns: minmax(0, 1fr); }
  .contact-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 900px) {
  .nav {
    position: fixed; inset: var(--header-h) 0 auto 0; background: #fff;
    flex-direction: column; align-items: stretch; gap: 0; padding: var(--sp-3) var(--sp-5) var(--sp-5);
    border-bottom: 1px solid var(--line); box-shadow: var(--shadow-lg);
    transform: translateY(-12px); opacity: 0; pointer-events: none; transition: opacity .18s ease, transform .18s ease;
    margin-left: 0;
  }
  .nav.is-open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-link { padding: .85rem .6rem; border-bottom: 1px solid var(--line-2); border-radius: 0; }
  .nav-toggle { display: block; }
  .header-actions .btn { display: none; }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cta-inner { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 640px) {
  :root { --sp-9: 4rem; --sp-8: 3rem; }
  .grid-2, .grid-3, .grid-4, .feature-grid, .steps, .form-grid, .gallery { grid-template-columns: minmax(0, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat { border-left: 0; border-top: 1px solid rgba(255,255,255,.1); }
  .stat:nth-child(-n+2) { border-top: 0; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .header-inner { gap: var(--sp-3); }
  .brand-text small { display: none; }
  .spec-table th { width: 46%; }
  .spec-table th, .spec-table td { padding: .65rem .7rem; }
}

/* 20. Motion & print ------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
  html { scroll-behavior: auto; }
}