/* ============================================================
   NovaVolt Energy — LiFePO4 Manufacturer Website
   Responsive stylesheet (mobile-first)
   ============================================================ */

/* ---------- Design tokens ---------- */
:root {
  --green: #00b874;
  --green-2: #00d68f;
  --green-deep: #008a57;
  --ink: #0a1f2b;          /* deep navy-ink text */
  --ink-2: #142e3d;
  --muted: #5b6f7b;
  --line: #e4ecef;
  --bg: #ffffff;
  --bg-soft: #f2f8f6;      /* soft green-tinted */
  --dark: #081a24;         /* dark sections */
  --dark-2: #0c2230;
  --card-line: rgba(255,255,255,.12);
  --radius: 16px;
  --radius-lg: 24px;
  --shadow: 0 10px 30px rgba(8,26,36,.08);
  --shadow-lg: 0 24px 60px rgba(8,26,36,.16);
  --font: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
  --font-head: 'Sora', 'Inter', 'PingFang SC', sans-serif;
  --header-h: 74px;
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 10px); }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; }
sub { font-size: .62em; }

.container { width: min(1180px, 92%); margin-inline: auto; }
.container-narrow { width: min(820px, 92%); }

::selection { background: var(--green-2); color: #06220f; }

/* ---------- Typography helpers ---------- */
h1, h2, h3, h4 { font-family: var(--font-head); line-height: 1.2; letter-spacing: -.01em; }
h1 { font-size: clamp(2.1rem, 5vw, 3.6rem); font-weight: 800; }
h2 { font-size: clamp(1.6rem, 3.4vw, 2.45rem); font-weight: 700; }
h3 { font-size: 1.14rem; font-weight: 600; }
.grad {
  background: linear-gradient(92deg, var(--green-2), #7cf7cd);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .8rem; font-weight: 700; letter-spacing: .16em;
  text-transform: uppercase; color: var(--green-2);
  margin-bottom: 14px;
}
.eyebrow.dark { color: var(--green); }
.eyebrow.dark::before, .eyebrow::before { display: none; }
.eyebrow .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--green-2);
  box-shadow: 0 0 0 4px rgba(0,214,143,.18);
}
.eyebrow.dark .dot { background: var(--green); box-shadow: 0 0 0 4px rgba(0,184,116,.16); }
.eyebrow.dark { display: inline-flex; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-weight: 600; font-size: .95rem;
  padding: 12px 24px; border-radius: 999px;
  border: 2px solid transparent;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease;
  white-space: nowrap;
}
.btn:focus-visible { outline: 3px solid rgba(0,184,116,.45); outline-offset: 2px; }
.btn-primary {
  background: linear-gradient(135deg, var(--green-2), var(--green));
  color: #04231a; box-shadow: 0 8px 22px rgba(0,184,116,.32);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 28px rgba(0,184,116,.4); }
.btn-ghost {
  color: #eafff6; border-color: rgba(255,255,255,.35); background: rgba(255,255,255,.04);
}
.btn-ghost:hover { border-color: var(--green-2); color: var(--green-2); transform: translateY(-2px); }
.btn-lg { padding: 15px 32px; font-size: 1rem; }
.btn-block { width: 100%; }

/* ---------- Header ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  height: var(--header-h);
  transition: background .25s ease, box-shadow .25s ease;
  background: transparent;
}
.site-header.scrolled {
  background: rgba(255,255,255,.92);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  box-shadow: 0 4px 24px rgba(8,26,36,.08);
}
.header-inner { height: var(--header-h); display: flex; align-items: center; justify-content: space-between; gap: 16px; }

.logo { display: flex; align-items: center; gap: 10px; }
.logo-text {
  font-family: var(--font-head); font-weight: 800; font-size: 1.22rem;
  color: #fff; letter-spacing: .01em; line-height: 1; display: flex; align-items: baseline; gap: 2px;
}
.logo-text span { color: var(--green-2); }
.logo-text small {
  font-size: .5rem; font-weight: 700; letter-spacing: .22em; margin-left: 3px;
  color: rgba(255,255,255,.75); align-self: center;
}
.scrolled .logo-text { color: var(--ink); }
.scrolled .logo-text small { color: var(--muted); }
.logo.light .logo-text { color: #fff; }

.main-nav { display: flex; align-items: center; gap: 26px; }
.nav-list { display: flex; gap: 4px; }
.nav-link {
  display: block; padding: 8px 12px; font-size: .93rem; font-weight: 500;
  color: rgba(255,255,255,.88); border-radius: 8px;
  transition: color .18s ease, background .18s ease;
}
.nav-link:hover { color: #fff; }
.nav-link.active { color: var(--green-2); }
.scrolled .nav-link { color: var(--ink-2); }
.scrolled .nav-link:hover { color: var(--green); background: var(--bg-soft); }
.scrolled .nav-link.active { color: var(--green); }
.nav-cta { padding: 10px 20px; font-size: .88rem; }

.nav-toggle {
  display: none; flex-direction: column; gap: 5px; width: 44px; height: 44px;
  align-items: center; justify-content: center;
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.25);
  border-radius: 12px; transition: background .2s;
}
.nav-toggle span { width: 20px; height: 2px; background: #fff; border-radius: 2px; transition: transform .25s ease, opacity .2s; }
.scrolled .nav-toggle { background: var(--bg-soft); border-color: var(--line); }
.scrolled .nav-toggle span { background: var(--ink); }
.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); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background:
    radial-gradient(900px 500px at 85% -10%, rgba(0,214,143,.16), transparent 60%),
    radial-gradient(700px 500px at -10% 110%, rgba(0,150,255,.10), transparent 55%),
    linear-gradient(160deg, var(--dark) 0%, #0a2030 55%, var(--dark-2) 100%);
  color: #fff;
  padding: calc(var(--header-h) + 56px) 0 0;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; pointer-events: none; opacity: .5;
  background-image:
    linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 20%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 90% 70% at 50% 20%, #000 30%, transparent 75%);
}
.hero-inner {
  position: relative;
  display: grid; grid-template-columns: 1.05fr .95fr;
  gap: 48px; align-items: center;
  padding-bottom: 72px;
}
.hero-copy .lead { font-size: 1.08rem; color: rgba(255,255,255,.82); margin: 22px 0 30px; max-width: 56ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 34px; }
.hero-badges li { display: flex; align-items: center; gap: 7px; font-size: .85rem; color: rgba(255,255,255,.72); }
.hero-badges svg { width: 17px; height: 17px; color: var(--green-2); flex: none; }

/* Hero visual (pure CSS cabinet mock) */
.hero-visual { position: relative; display: flex; justify-content: center; padding: 18px 0; }
.hv-glow {
  position: absolute; top: 50%; left: 50%; width: 430px; height: 430px;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(0,214,143,.22), transparent 65%);
  filter: blur(6px);
}
.cabinet {
  position: relative; width: min(330px, 100%);
  background: linear-gradient(180deg, #12293a, #0c2131);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 20px; padding: 16px;
  box-shadow: 0 40px 80px rgba(0,0,0,.45), inset 0 1px 0 rgba(255,255,255,.08);
  transform: rotate(-2deg);
  animation: floaty 6s ease-in-out infinite;
}
@keyframes floaty { 0%,100% { transform: rotate(-2deg) translateY(0); } 50% { transform: rotate(-2deg) translateY(-10px); } }
.cab-head {
  display: flex; align-items: center; gap: 6px;
  padding-bottom: 12px; margin-bottom: 12px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.cab-head i { width: 8px; height: 8px; border-radius: 50%; background: #ff5f57; }
.cab-head i:nth-child(2) { background: #febc2e; }
.cab-head i:nth-child(3) { background: #28c840; }
.cab-head span { margin-left: auto; font-size: .66rem; color: rgba(255,255,255,.55); letter-spacing: .06em; }
.cab-body { display: grid; gap: 10px; }
.cell-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.cell {
  aspect-ratio: 1/1.35; border-radius: 8px;
  background: linear-gradient(160deg, rgba(0,214,143,.28), rgba(0,138,87,.55));
  border: 1px solid rgba(0,214,143,.35);
  position: relative;
  box-shadow: inset 0 0 18px rgba(0,214,143,.14);
}
.cell::after {
  content: ''; position: absolute; inset: 4px; border-radius: 5px;
  background: linear-gradient(150deg, rgba(255,255,255,.16), transparent 45%);
}
.cell-row:nth-child(2) .cell { opacity: .85; }
.cell-row:nth-child(3) .cell { opacity: .7; }
.cab-foot { display: flex; align-items: center; gap: 8px; margin-top: 14px; padding-top: 12px; border-top: 1px solid rgba(255,255,255,.08); }
.cab-foot .power-line { flex: 1; height: 6px; border-radius: 4px; background: repeating-linear-gradient(90deg, rgba(255,255,255,.14) 0 10px, transparent 10px 16px); position: relative; overflow: hidden; }
.cab-foot .power-line::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(90deg, transparent, var(--green-2), transparent);
  animation: pulse 2.2s ease-in-out infinite; opacity: .9;
}
@keyframes pulse { 0% { transform: translateX(-100%); } 100% { transform: translateX(100%); } }
.cab-foot b { font-size: .7rem; color: rgba(255,255,255,.7); letter-spacing: .1em; }
.cab-foot .plug { width: 14px; height: 14px; border-radius: 4px; background: var(--green); box-shadow: 0 0 12px rgba(0,214,143,.8); }

.chip {
  position: absolute; display: flex; flex-direction: column;
  background: rgba(13, 32, 46, .9);
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 14px; padding: 10px 16px;
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
  box-shadow: 0 14px 30px rgba(0,0,0,.35);
  z-index: 2; animation: floaty2 5s ease-in-out infinite;
}
@keyframes floaty2 { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
.chip b { font-family: var(--font-head); font-size: 1rem; color: var(--green-2); line-height: 1.3; }
.chip span { font-size: .72rem; color: rgba(255,255,255,.6); }
.chip-1 { top: 8%; left: -2%; }
.chip-2 { bottom: 16%; right: -4%; animation-delay: 1s; }
.chip-3 { top: -12px; right: 8%; display: flex; flex-direction: row; align-items: center; gap: 7px; animation-delay: 2s; }
.chip-3 svg { color: var(--green-2); }

/* Stats */
.stats-bar {
  position: relative; z-index: 2;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.1);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: 28px 34px; margin-bottom: 0;
  transform: translateY(46px);
}
.stat { text-align: center; border-right: 1px solid rgba(255,255,255,.1); padding-inline: 10px; }
.stat:last-child { border-right: 0; }
.stat b {
  display: block; font-family: var(--font-head); font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  font-weight: 800; color: #fff; line-height: 1.1;
}
.stat b::after { content: attr(data-suffix); }
.stat span { font-size: .85rem; color: rgba(255,255,255,.62); }

/* ---------- Sections ---------- */
.section { padding: 120px 0 90px; }
.section-dark {
  background: linear-gradient(150deg, var(--dark), var(--dark-2));
  color: #fff;
}
.section-soft { background: var(--bg-soft); }
.sec-head { max-width: 640px; margin-bottom: 54px; }
.sec-head.left { margin-bottom: 34px; }
.sec-head h2 { margin-bottom: 14px; }
.sec-head p:not(.eyebrow) { color: var(--muted); font-size: 1.02rem; }
.sec-head.light p:not(.eyebrow) { color: rgba(255,255,255,.68); }
.sec-head .eyebrow + h2 { margin-top: 0; }

/* ---------- Products ---------- */
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.product-card {
  position: relative;
  display: flex; flex-direction: column;
  background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px 22px;
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: rgba(0,184,116,.35); }
.pc-icon {
  width: 54px; height: 54px; border-radius: 14px; margin-bottom: 18px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, rgba(0,214,143,.16), rgba(0,184,116,.05));
  color: var(--green); border: 1px solid rgba(0,184,116,.22);
}
.pc-icon svg { width: 28px; height: 28px; }
.product-card h3 { margin-bottom: 8px; font-size: 1.08rem; }
.product-card p { color: var(--muted); font-size: .9rem; flex-grow: 1; }
.pc-tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 14px 0 16px; }
.pc-tags li {
  font-size: .7rem; font-weight: 600; color: var(--green-deep);
  background: rgba(0,184,116,.1); padding: 4px 10px; border-radius: 999px;
}
.pc-link { font-size: .88rem; font-weight: 600; color: var(--green); display: inline-flex; align-items: center; gap: 4px; transition: gap .18s ease; }
.pc-link:hover { gap: 9px; color: var(--green-deep); }
.pc-cta {
  background: linear-gradient(160deg, #0b2b3a, #0a1f2b); color: #fff;
  border-color: transparent; justify-content: center; text-align: left;
}
.pc-cta:hover { box-shadow: var(--shadow-lg); border-color: transparent; }
.pc-cta h3 { color: #fff; font-size: 1.25rem; margin-bottom: 10px; }
.pc-cta p { color: rgba(255,255,255,.7); margin-bottom: 18px; }
.pc-cta .btn { align-self: flex-start; }
.pc-cta .btn-primary { box-shadow: 0 8px 22px rgba(0,184,116,.35); }

/* ---------- Applications ---------- */
.app-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.app-item {
  border: 1px solid var(--card-line); border-radius: var(--radius);
  padding: 26px 24px; position: relative; overflow: hidden;
  transition: border-color .2s ease, transform .2s ease, background .2s ease;
}
.app-item:hover { border-color: rgba(0,214,143,.5); transform: translateY(-4px); background: rgba(255,255,255,.03); }
.ai-num { font-family: var(--font-head); font-weight: 800; font-size: .85rem; color: var(--green-2); opacity: .9; letter-spacing: .12em; }
.app-item h3 { color: #fff; margin: 10px 0 6px; font-size: 1.06rem; }
.app-item p { color: rgba(255,255,255,.6); font-size: .9rem; }

/* ---------- Why us ---------- */
.why-inner { display: grid; grid-template-columns: .9fr 1.1fr; gap: 60px; align-items: center; }
.why-visual { display: flex; justify-content: center; }
.wv-card {
  width: min(420px, 100%);
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); padding: 22px; transform: rotate(1.5deg);
}
.wv-top { display: flex; align-items: center; gap: 10px; font-size: .8rem; color: var(--muted); margin-bottom: 20px; }
.wv-top .wv-led { width: 10px; height: 10px; border-radius: 50%; background: var(--green-2); box-shadow: 0 0 0 5px rgba(0,214,143,.15); animation: blink 1.6s infinite; }
@keyframes blink { 0%,100% { opacity: 1; } 50% { opacity: .45; } }
.wv-top b { margin-left: auto; color: var(--green); font-size: .75rem; letter-spacing: .08em; }
.wv-chart { display: flex; align-items: flex-end; gap: 12px; height: 150px; padding: 0 6px; }
.bar {
  flex: 1; height: var(--h); border-radius: 8px 8px 4px 4px;
  background: linear-gradient(180deg, var(--green-2), var(--green));
  opacity: .85; animation: grow 1.4s cubic-bezier(.2,.8,.2,1) both;
  transform-origin: bottom;
}
@keyframes grow { from { transform: scaleY(.2); opacity: 0; } to { transform: scaleY(1); opacity: .85; } }
.wv-bottom {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px;
  margin-top: 20px; padding-top: 18px; border-top: 1px dashed var(--line);
}
.wv-bottom div { text-align: center; }
.wv-bottom b { display: block; font-family: var(--font-head); font-size: 1.35rem; color: var(--ink); }
.wv-bottom span { font-size: .72rem; color: var(--muted); }

.why-list { display: grid; gap: 26px; }
.why-list > li { display: flex; gap: 18px; }
.wl-icon {
  flex: none; width: 50px; height: 50px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, rgba(0,214,143,.18), rgba(0,184,116,.06));
  border: 1px solid rgba(0,184,116,.25); color: var(--green);
}
.wl-icon svg { width: 25px; height: 25px; }
.why-list h3 { font-size: 1.06rem; margin-bottom: 4px; }
.why-list p { color: var(--muted); font-size: .92rem; }

/* ---------- Quality / certs ---------- */
.cert-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 56px; }
.cert {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 18px; text-align: center;
  transition: transform .2s ease, box-shadow .2s ease;
}
.cert:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.cert span { font-family: var(--font-head); font-weight: 700; font-size: 1.06rem; color: var(--ink); display: block; }
.cert small { color: var(--muted); font-size: .76rem; }

.flow {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 34px 36px; box-shadow: var(--shadow);
}
.flow > h3 { font-size: 1.25rem; margin-bottom: 24px; }
.flow-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: step; }
.flow-list li { display: flex; gap: 14px; align-items: flex-start; position: relative; }
.flow-list li:not(:last-child)::after {
  content: ''; position: absolute; top: 20px; left: calc(100% + 4px); width: 60%; height: 2px;
  background: repeating-linear-gradient(90deg, rgba(0,184,116,.4) 0 6px, transparent 6px 11px);
}
.flow-list b { font-family: var(--font-head); font-size: 1.3rem; color: var(--green); line-height: 1.1; }
.flow-list h4 { font-size: .98rem; margin-bottom: 4px; }
.flow-list p { font-size: .83rem; color: var(--muted); }

/* ---------- FAQ ---------- */
.faq-list { display: grid; gap: 12px; }
.faq-item { border: 1px solid var(--line); border-radius: 14px; background: #fff; overflow: hidden; transition: border-color .2s ease, box-shadow .2s ease; }
.faq-item.open { border-color: rgba(0,184,116,.5); box-shadow: var(--shadow); }
.faq-q {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 14px;
  background: none; border: 0; text-align: left;
  font-family: var(--font-head); font-weight: 600; font-size: 1rem; color: var(--ink);
  padding: 19px 22px;
}
.faq-q:focus-visible { outline: 3px solid rgba(0,184,116,.4); outline-offset: -3px; border-radius: 14px; }
.faq-chev { position: relative; flex: none; width: 14px; height: 14px; transition: transform .25s ease; }
.faq-chev::before, .faq-chev::after {
  content: ''; position: absolute; background: var(--green); border-radius: 2px;
  transition: transform .25s ease;
}
.faq-chev::before { width: 14px; height: 2px; top: 6px; left: 0; }
.faq-chev::after { width: 2px; height: 14px; top: 0; left: 6px; }
.faq-item.open .faq-chev { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .32s ease; }
.faq-a p { padding: 0 22px 20px; color: var(--muted); font-size: .94rem; }

/* ---------- Contact ---------- */
.contact-wrap { padding-top: 110px; }
.contact-inner { display: grid; grid-template-columns: 1fr 1.05fr; gap: 56px; align-items: start; }
.contact-info h2 { color: #fff; margin-bottom: 12px; }
.contact-info .lead { color: rgba(255,255,255,.72); margin-bottom: 30px; }
.contact-info .lead b { color: var(--green-2); }
.ci-list { display: grid; gap: 18px; }
.ci-list li { display: flex; gap: 15px; align-items: flex-start; }
.ci-icon {
  flex: none; width: 46px; height: 46px; border-radius: 13px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0,214,143,.12); border: 1px solid rgba(0,214,143,.3);
  color: var(--green-2);
}
.ci-icon svg { width: 22px; height: 22px; }
.ci-list small { display: block; font-size: .72rem; text-transform: uppercase; letter-spacing: .1em; color: rgba(255,255,255,.5); margin-bottom: 2px; }
.ci-list a { color: #fff; font-weight: 500; transition: color .18s ease; }
.ci-list a:hover { color: var(--green-2); }
.ci-list li span:last-child { color: rgba(255,255,255,.85); font-size: .95rem; }

.quote-form {
  background: #fff; border-radius: var(--radius-lg);
  padding: 34px 32px; box-shadow: var(--shadow-lg);
}
.quote-form h3 { font-size: 1.35rem; margin-bottom: 22px; }
.qf-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.qf-field { margin-bottom: 16px; display: flex; flex-direction: column; gap: 6px; }
.qf-field label { font-size: .83rem; font-weight: 600; color: var(--ink-2); }
.qf-field input, .qf-field select, .qf-field textarea {
  font-family: inherit; font-size: .94rem; color: var(--ink);
  border: 1.5px solid var(--line); border-radius: 10px;
  padding: 11px 14px; background: #fbfdfd;
  transition: border-color .18s ease, box-shadow .18s ease;
  width: 100%;
}
.qf-field textarea { resize: vertical; min-height: 90px; }
.qf-field input:focus, .qf-field select:focus, .qf-field textarea:focus {
  outline: none; border-color: var(--green);
  box-shadow: 0 0 0 4px rgba(0,184,116,.13); background: #fff;
}
.qf-field input.invalid, .qf-field select.invalid, .qf-field textarea.invalid { border-color: #e5484d; }
.form-note { margin-top: 14px; font-size: .9rem; font-weight: 600; min-height: 1.4em; }
.form-note.ok { color: var(--green-deep); }
.form-note.err { color: #d43d43; }
.form-hint { margin-top: 6px; font-size: .8rem; color: var(--muted); }
.form-hint a { color: var(--green); font-weight: 600; }

/* ---------- Footer ---------- */
.site-footer { background: #05141d; color: rgba(255,255,255,.72); }
.footer-grid {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.3fr; gap: 36px;
  padding: 60px 0 40px;
}
.f-brand p { margin-top: 14px; font-size: .9rem; color: rgba(255,255,255,.55); max-width: 34ch; }
.f-col h4 { color: #fff; font-size: .95rem; margin-bottom: 16px; letter-spacing: .02em; }
.f-col ul { display: grid; gap: 10px; }
.f-col a { font-size: .9rem; color: rgba(255,255,255,.62); transition: color .18s ease; }
.f-col a:hover { color: var(--green-2); }
.f-contact li { font-size: .9rem; }
.footer-bottom {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px;
  border-top: 1px solid rgba(255,255,255,.08);
  padding: 20px 0 24px; font-size: .82rem; color: rgba(255,255,255,.45);
}
.fb-links { letter-spacing: .08em; }

/* ---------- Back to top ---------- */
.back-top {
  position: fixed; right: 22px; bottom: 22px; z-index: 90;
  width: 48px; height: 48px; border-radius: 14px; border: 0;
  background: linear-gradient(135deg, var(--green-2), var(--green));
  color: #04231a; box-shadow: 0 10px 26px rgba(0,184,116,.4);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transform: translateY(14px); pointer-events: none;
  transition: opacity .25s ease, transform .25s ease;
}
.back-top.show { opacity: 1; transform: translateY(0); pointer-events: auto; }
.back-top:hover { transform: translateY(-3px); }

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1080px) {
  .product-grid { grid-template-columns: repeat(3, 1fr); }
  .cert-grid { grid-template-columns: repeat(4, 1fr); }
  .flow-list { grid-template-columns: repeat(2, 1fr); gap: 26px; }
  .flow-list li:nth-child(2)::after { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 940px) {
  .hero-inner { grid-template-columns: 1fr; padding-bottom: 120px; text-align: center; }
  .hero-copy { display: flex; flex-direction: column; align-items: center; }
  .hero-badges { justify-content: center; }
  .hero-visual { margin-top: 10px; }
  .hero-visual, .hv-glow { order: 2; }
  .hero-inner .hero-copy { order: 1; }
  .stats-bar { transform: translateY(34px); }

  .why-inner { grid-template-columns: 1fr; gap: 44px; }
  .why-visual { order: 2; }
  .why-copy { order: 1; }

  .contact-inner { grid-template-columns: 1fr; }
  .section { padding: 96px 0 72px; }
  .app-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 860px) {
  /* Mobile navigation drawer */
  .nav-toggle { display: flex; }
  .main-nav {
    position: fixed; top: var(--header-h); left: 0; right: 0; z-index: 99;
    flex-direction: column; align-items: stretch; gap: 0;
    background: #fff; padding: 14px 5% 26px;
    box-shadow: 0 30px 50px rgba(8,26,36,.18);
    transform: translateY(-16px); opacity: 0; pointer-events: none;
    transition: transform .25s ease, opacity .2s ease;
  }
  .main-nav.open { transform: none; opacity: 1; pointer-events: auto; }
  .nav-list { flex-direction: column; gap: 2px; }
  .nav-link { color: var(--ink); font-size: 1.05rem; padding: 12px 10px; border-radius: 10px; }
  .nav-link:hover { background: var(--bg-soft); }
  .nav-link.active { color: var(--green); }
  .nav-cta { margin-top: 14px; justify-content: center; }
  .header-inner { position: relative; }
}

@media (max-width: 760px) {
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-bar { grid-template-columns: repeat(2, 1fr); row-gap: 22px; }
  .stat { border-right: 0; }
  .stat:nth-child(odd) { border-right: 1px solid rgba(255,255,255,.1); }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .chip-1 { left: 2%; }
  .chip-2 { right: 2%; }
}

@media (max-width: 520px) {
  .product-grid { grid-template-columns: 1fr; }
  .app-grid { grid-template-columns: 1fr; }
  .hero { padding-top: calc(var(--header-h) + 34px); }
  .hero-actions .btn { width: 100%; }
  .qf-row { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .flow-list { grid-template-columns: 1fr; }
  .flow-list li::after { display: none; }
  .stats-bar { padding: 22px 18px; }
  .quote-form { padding: 26px 20px; }
  .section { padding: 84px 0 60px; }
}

/* ===== Factory tour video ===== */
.video-frame {
  max-width: 920px;
  margin: 0 auto;
  background: #0b1220;
  border-radius: 16px;
  padding: 10px;
  box-shadow: 0 24px 60px rgba(2, 8, 23, 0.35);
}
.video-frame video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: 10px;
  background: #000;
}
.video-frame figcaption {
  padding: 12px 8px 4px;
  text-align: center;
  font-size: 0.85rem;
  color: #64748b;
}

/* ===== Featured product showcase ===== */
.feat {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
  margin-top: 64px;
  padding: 32px;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 20px;
  box-shadow: 0 18px 48px rgba(2, 8, 23, 0.08);
}
.feat-media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
}
.feat-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  background: #dcfce7;
  color: #15803d;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.feat-info h3 {
  margin: 14px 0 10px;
  font-size: 1.6rem;
}
.feat-info > p {
  color: #475569;
  line-height: 1.7;
}
.feat-models {
  list-style: none;
  margin: 20px 0 24px;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.feat-models li {
  display: flex;
  flex-direction: column;
  padding: 10px 14px;
  background: #f1f5f9;
  border-radius: 10px;
}
.feat-models b { font-size: 1.05rem; color: #0f172a; }
.feat-models span { font-size: 0.82rem; color: #64748b; }
@media (max-width: 900px) {
  .feat { grid-template-columns: 1fr; padding: 20px; gap: 24px; }
}