/* =========================================================
 * InnoVolt 官网样式 — 浅色工业风
 * 主色：绿 #2F9E52 / 蓝紫 #3B45B0
 * ======================================================= */
:root {
  --green: #2F9E52;
  --green-dark: #237A40;
  --green-bg: #EAF6EE;
  --purple: #3B45B0;
  --purple-bg: #EDEFFA;
  --ink: #17202B;
  --text: #3D4753;
  --muted: #7A8694;
  --line: #E3E9EE;
  --bg: #F6F8FA;
  --card: #FFFFFF;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(23,32,43,.05), 0 8px 24px rgba(23,32,43,.06);
  --shadow-hover: 0 2px 6px rgba(23,32,43,.07), 0 16px 40px rgba(23,32,43,.10);
}
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg); color: var(--text);
  line-height: 1.75; font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
button { font-family: inherit; cursor: pointer; }

/* ---------- NAV ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .25s;
}
.nav.scrolled { box-shadow: 0 4px 20px rgba(23,32,43,.08); }
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 32px;
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.logo-img { height: 40px; width: auto; }
.nav-links { display: flex; gap: 30px; list-style: none; }
.nav-links a {
  font-size: 14.5px; font-weight: 500; color: var(--text);
  padding: 6px 2px; border-bottom: 2px solid transparent;
  transition: color .2s, border-color .2s;
}
.nav-links a:hover { color: var(--green); }
.nav-links a.active { color: var(--green); border-color: var(--green); font-weight: 600; }
.nav-right { display: flex; align-items: center; gap: 14px; }
.lang-toggle {
  font-size: 13px; font-weight: 600; color: var(--green);
  border: 1.5px solid var(--green); background: transparent;
  padding: 5px 14px; border-radius: 20px; transition: all .2s;
}
.lang-toggle:hover { background: var(--green); color: #fff; }
.nav-quote {
  display: none; font-size: 13.5px; font-weight: 600; color: #fff;
  background: var(--green); padding: 8px 18px; border-radius: 8px;
  transition: background .2s;
}
.nav-quote:hover { background: var(--green-dark); }
.nav-burger {
  display: none; background: none; border: none; width: 40px; height: 40px;
  flex-direction: column; justify-content: center; align-items: center; gap: 5px;
}
.nav-burger span { display: block; width: 22px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform .25s, opacity .25s; }
body.nav-open .nav-burger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
body.nav-open .nav-burger span:nth-child(2) { opacity: 0; }
body.nav-open .nav-burger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- HERO ---------- */
.hero {
  min-height: 92vh; display: flex; align-items: center;
  position: relative; overflow: hidden;
  padding: 130px 32px 70px;
}
.hero-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 55% 60% at 82% 20%, rgba(47,158,82,.09) 0%, transparent 70%),
    radial-gradient(ellipse 45% 50% at 8% 85%, rgba(59,69,176,.07) 0%, transparent 70%),
    linear-gradient(rgba(23,32,43,.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23,32,43,.028) 1px, transparent 1px);
  background-size: auto, auto, 48px 48px, 48px 48px;
}
.hero-content {
  position: relative; z-index: 2; max-width: 1200px; margin: 0 auto; width: 100%;
  display: grid; grid-template-columns: 1.1fr 1fr; gap: 64px; align-items: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--green-bg); border: 1px solid rgba(47,158,82,.35);
  color: var(--green-dark); font-size: 13px; font-weight: 600;
  padding: 6px 16px; border-radius: 30px; margin-bottom: 22px;
}
.hero-badge::before { content: ''; width: 7px; height: 7px; background: var(--green); border-radius: 50%; animation: pulse 2s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.35} }
.hero h1 {
  font-size: clamp(34px, 4.6vw, 56px); font-weight: 800;
  line-height: 1.18; color: var(--ink); letter-spacing: -.5px; margin-bottom: 20px;
}
.hero h1 .g { color: var(--green); }
.hero h1 .p { color: var(--purple); }
.hero-sub { font-size: 17px; color: var(--muted); margin-bottom: 34px; max-width: 520px; }
.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
  background: var(--green); color: #fff; padding: 13px 30px;
  border-radius: 9px; font-weight: 700; font-size: 15px;
  display: inline-flex; align-items: center; gap: 8px; transition: all .2s;
}
.btn-primary:hover { background: var(--green-dark); transform: translateY(-1px); box-shadow: 0 8px 22px rgba(47,158,82,.35); }
.btn-secondary {
  background: #fff; color: var(--ink); padding: 13px 30px;
  border-radius: 9px; font-weight: 600; font-size: 15px;
  border: 1.5px solid var(--line); transition: all .2s;
}
.btn-secondary:hover { border-color: var(--green); color: var(--green); }
.hero-right { display: flex; flex-direction: column; gap: 16px; }
.stats-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 28px; display: flex; align-items: center; gap: 20px;
  box-shadow: var(--shadow); transition: transform .2s, box-shadow .2s;
}
.stats-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.stats-card .icon {
  font-size: 26px; width: 54px; height: 54px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.stats-card .icon.g { background: var(--green-bg); }
.stats-card .icon.p { background: var(--purple-bg); }
.stats-card .label { font-size: 13px; color: var(--muted); font-weight: 500; }
.stats-card .value { font-size: 24px; font-weight: 800; color: var(--ink); font-variant-numeric: tabular-nums; line-height: 1.3; }
.stats-card .value.g { color: var(--green-dark); }
.stats-card .value.p { color: var(--purple); }
.stats-card .unit { font-size: 13px; font-weight: 500; color: var(--muted); margin-left: 4px; }

/* ---------- SECTION 通用 ---------- */
.section { max-width: 1200px; margin: 0 auto; padding: 90px 32px 70px; }
.section-tag {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: 2.5px;
  text-transform: uppercase; color: var(--green); margin-bottom: 10px;
}
.section-title { font-size: clamp(26px, 3vw, 36px); font-weight: 800; color: var(--ink); margin-bottom: 12px; letter-spacing: -.3px; }
.section-sub { font-size: 16px; color: var(--muted); margin-bottom: 44px; }
.divider { border: none; border-top: 1px solid var(--line); max-width: 1136px; margin: 0 auto; }

/* ---------- PRODUCTS ---------- */
.product-tabs { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 34px; }
.tab {
  background: #fff; border: 1.5px solid var(--line); color: var(--text);
  font-size: 14px; font-weight: 600; padding: 8px 22px; border-radius: 24px;
  transition: all .2s;
}
.tab:hover { border-color: var(--green); color: var(--green); }
.tab.active { background: var(--green); border-color: var(--green); color: #fff; }
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.product-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column;
  box-shadow: var(--shadow); transition: transform .2s, box-shadow .2s;
}
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.product-card-img {
  position: relative; padding: 28px 30px 18px;
  background: linear-gradient(160deg, #F2F7F3 0%, #EDF2EE 100%);
  border-bottom: 1px solid var(--line);
  min-height: 210px;
  display: flex; align-items: center; justify-content: center;
}
.vis-inverter { background: linear-gradient(160deg, #F0F5F1 0%, #E9EFF3 100%); }
.vis-ess { background: linear-gradient(160deg, #F1F4F2 0%, #EAEFF2 100%); }
.vis-pwb { background: linear-gradient(160deg, #F3F4F0 0%, #ECEFF2 100%); }
.product-card-img svg { width: 100%; height: auto; max-height: 180px; }
.product-card-img img { max-width: 100%; max-height: 180px; object-fit: contain; filter: drop-shadow(0 10px 22px rgba(0,0,0,.13)); }
.product-card-badge {
  position: absolute; top: 14px; right: 14px;
  background: var(--green); color: #fff; font-size: 12px; font-weight: 600;
  padding: 3px 12px; border-radius: 14px;
}
.product-card-badge.purple { background: var(--purple); }
.product-card-body { padding: 20px 22px 16px; flex: 1; display: flex; flex-direction: column; }
.product-card-type {
  font-size: 11.5px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase;
  color: var(--muted); margin-bottom: 6px;
}
.product-card h3 { font-size: 17.5px; font-weight: 700; color: var(--ink); margin-bottom: 8px; }
.product-card-body > p { font-size: 14px; color: var(--text); flex: 1; }
.product-specs { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; }
.spec-tag {
  font-size: 12px; font-weight: 500; color: var(--green-dark);
  background: var(--green-bg); padding: 3px 10px; border-radius: 5px; white-space: nowrap;
}
.product-card-footer {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 22px; border-top: 1px solid var(--line); background: #FBFCFD;
}
.product-price { font-size: 17px; font-weight: 800; color: var(--ink); }
.product-price small { font-size: 12px; font-weight: 500; color: var(--muted); }
.product-link { font-size: 14px; font-weight: 600; color: var(--green); transition: color .2s; }
.product-link:hover { color: var(--green-dark); }

/* ---------- SCENES ---------- */
.scene-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.scene-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 30px 24px; box-shadow: var(--shadow);
  transition: transform .2s, box-shadow .2s; position: relative; overflow: hidden;
}
.scene-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--green), var(--purple));
  opacity: 0; transition: opacity .25s;
}
.scene-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.scene-card:hover::before { opacity: 1; }
.scene-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; }
.scene-icon {
  font-size: 24px; width: 52px; height: 52px; border-radius: 12px;
  background: var(--green-bg); display: flex; align-items: center; justify-content: center;
}
.scene-num { font-size: 30px; font-weight: 800; color: var(--line); font-variant-numeric: tabular-nums; }
.scene-card h3 { font-size: 18px; font-weight: 700; color: var(--ink); margin-bottom: 10px; }
.scene-card p { font-size: 14.5px; color: var(--text); margin-bottom: 16px; }
.scene-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.scene-tags .spec-tag { background: var(--purple-bg); color: var(--purple); }

/* ---------- TECH ---------- */
.tech-section { background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.tech-section.section { max-width: none; }
.tech-inner { max-width: 1200px; margin: 0 auto; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.tech-card {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 26px; transition: all .2s;
}
.tech-card:hover { background: #fff; box-shadow: var(--shadow-hover); transform: translateY(-3px); border-color: rgba(47,158,82,.4); }
.tech-icon {
  font-size: 24px; width: 52px; height: 52px; border-radius: 12px;
  background: var(--green-bg); display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
}
.tech-card h3 { font-size: 17px; font-weight: 700; color: var(--ink); margin-bottom: 8px; }
.tech-card p { font-size: 14px; color: var(--text); }

/* ---------- ABOUT ---------- */
.about-grid { display: grid; grid-template-columns: 1.15fr 1fr; gap: 48px; align-items: start; }
.about-tagline { font-size: 21px; font-weight: 700; color: var(--ink); margin-bottom: 18px; line-height: 1.5; }
.about-tagline .g { color: var(--green); }
.about-desc { font-size: 15px; color: var(--text); margin-bottom: 30px; }
.about-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.a-stat {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 18px 14px; text-align: center; box-shadow: var(--shadow);
}
.a-stat .v { font-size: 22px; font-weight: 800; color: var(--green-dark); font-variant-numeric: tabular-nums; }
.a-stat .l { font-size: 12.5px; color: var(--muted); margin-top: 2px; }
.cert-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.cert-card {
  display: flex; gap: 14px; align-items: flex-start;
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 16px 18px; box-shadow: var(--shadow); transition: transform .2s, box-shadow .2s;
}
.cert-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.cert-icon {
  font-size: 20px; width: 44px; height: 44px; border-radius: 10px; flex-shrink: 0;
  background: var(--purple-bg); display: flex; align-items: center; justify-content: center;
}
.cert-name { font-size: 14.5px; font-weight: 700; color: var(--ink); line-height: 1.4; }
.cert-desc { font-size: 12.5px; color: var(--muted); margin-top: 2px; }

/* ---------- FAQ ---------- */
.faq-wrap { max-width: 860px; margin: 0 auto; }
.faq-item {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  margin-bottom: 12px; overflow: hidden; box-shadow: var(--shadow);
}
.faq-q {
  width: 100%; background: none; border: none; text-align: left;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 18px 22px; font-size: 15.5px; font-weight: 600; color: var(--ink);
}
.faq-arrow { color: var(--green); font-size: 18px; font-weight: 700; transition: transform .25s; flex-shrink: 0; }
.faq-item.open .faq-arrow { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-item.open .faq-a { max-height: 400px; }
.faq-a p { padding: 0 22px 20px; font-size: 14.5px; color: var(--text); }

/* ---------- CONTACT ---------- */
.contact-section { background: #fff; border-top: 1px solid var(--line); }
.contact-section.section { max-width: none; }
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; max-width: 1200px; margin: 0 auto; }
.contact-info { display: flex; flex-direction: column; gap: 16px; }
.contact-item { display: flex; gap: 16px; align-items: flex-start; }
.contact-icon {
  font-size: 19px; width: 46px; height: 46px; border-radius: 11px; flex-shrink: 0;
  background: var(--green-bg); display: flex; align-items: center; justify-content: center;
}
.contact-item h4 { font-size: 13px; font-weight: 600; color: var(--muted); margin-bottom: 2px; }
.contact-item p { font-size: 15px; color: var(--ink); font-weight: 500; }
.contact-item p a:hover { color: var(--green); }
.contact-item p .sub { display: block; font-size: 12.5px; color: var(--muted); font-weight: 400; }
.quote-card {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 32px; box-shadow: var(--shadow);
}
.quote-card h3 { font-size: 19px; font-weight: 700; color: var(--ink); }
.quote-card .form-sub { font-size: 13.5px; color: var(--muted); margin: 4px 0 20px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-group { margin-bottom: 14px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; color: var(--ink); margin-bottom: 6px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; background: #fff; border: 1.5px solid var(--line); border-radius: 9px;
  padding: 11px 14px; font-size: 14.5px; font-family: inherit; color: var(--ink);
  transition: border-color .2s, box-shadow .2s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--green); box-shadow: 0 0 0 3px rgba(47,158,82,.12);
}
.form-group input.err, .form-group textarea.err { border-color: #D64545; box-shadow: 0 0 0 3px rgba(214,69,69,.1); }
.form-group textarea { resize: vertical; min-height: 96px; }
.quote-card button[type=submit] {
  width: 100%; background: var(--green); color: #fff; border: none;
  font-size: 15.5px; font-weight: 700; padding: 13px; border-radius: 9px;
  transition: background .2s, transform .2s;
}
.quote-card button[type=submit]:hover { background: var(--green-dark); transform: translateY(-1px); }
.quote-card button[type=submit]:disabled { opacity: .6; cursor: wait; transform: none; }
.form-msg { display: none; margin-top: 14px; font-size: 13.5px; color: var(--green-dark); background: var(--green-bg); border: 1px solid rgba(47,158,82,.3); border-radius: 9px; padding: 10px 14px; }
.form-msg.show { display: block; }

/* ---------- FOOTER ---------- */
footer { background: #14231B; color: #B9C8BF; padding: 34px 32px; }
.footer-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap;
}
.footer-slogan { font-size: 14px; color: #7E9488; margin-top: 6px; }
.footer-links { display: flex; gap: 22px; list-style: none; flex-wrap: wrap; }
.footer-links a { font-size: 13.5px; color: #B9C8BF; transition: color .2s; }
.footer-links a:hover { color: #fff; }
.footer-meta { text-align: right; }
.footer-copy { font-size: 12.5px; color: #6B7F73; }
.footer-icp { font-size: 12px; color: #55685D; margin-top: 2px; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-content { grid-template-columns: 1fr; gap: 44px; }
  .hero-right { flex-direction: row; }
  .hero-right .stats-card { flex: 1; flex-direction: column; text-align: center; gap: 8px; padding: 20px 14px; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
}
@media (max-width: 768px) {
  .nav-inner { padding: 0 20px; height: 62px; }
  .logo-img { height: 34px; }
  .nav-links {
    display: none; position: absolute; top: 62px; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    flex-direction: column; gap: 0; padding: 8px 0;
    box-shadow: 0 16px 32px rgba(23,32,43,.1);
  }
  body.nav-open .nav-links { display: flex; }
  .nav-links a { display: block; padding: 13px 24px; border-bottom: none; }
  .nav-links a.active { background: var(--green-bg); }
  .nav-quote { display: inline-block; }
  .nav-burger { display: flex; }
  .hero { padding: 110px 20px 50px; min-height: auto; }
  .hero-right { flex-direction: column; }
  .hero-right .stats-card { flex-direction: row; text-align: left; gap: 16px; }
  .section { padding: 64px 20px 50px; }
  .product-grid, .feature-grid, .scene-grid, .cert-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; text-align: center; }
  .footer-meta { text-align: center; }
}