/* ===========================================================
   LEIFERT INDUCTION（雷菲特）中国区官网 — 站点样式
   品牌色：蓝 #0078BE · 橙 #E97218 · 深灰 #3C4446
   =========================================================== */

:root {
  --bg: #0F1D24;          /* 深色区底 */
  --bg-2: #13262F;        /* 深色卡片 */
  --bg-3: #18303B;        /* 深色卡片 hover */
  --blue: #0078BE;
  --blue-2: #2E9BD8;
  --orange: #E97218;
  --orange-2: #FF8E33;
  --ink: #2B363C;         /* 浅色区正文 */
  --paper: #F2F5F7;

  --txt-dark: #EAF1F5;
  --txt-dim: rgba(234, 241, 245, .62);
  --txt-ink-dim: rgba(43, 54, 60, .78);
  --line-dark: rgba(255, 255, 255, .12);
  --line-light: rgba(43, 54, 60, .12);

  --wrap: 1260px;
  --radius: 16px;
  --font: "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC",
          "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system,
          "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--txt-dark);
  -webkit-font-smoothing: antialiased;
  line-height: 1.75;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
h1, h2, h3, h4 { margin: 0; font-weight: 800; letter-spacing: -.01em; line-height: 1.2; }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 32px; }

.accent { color: var(--orange); }
.accent-soft { color: #FFC08A; }

/* ---------------- 顶部条 ---------------- */
.topbar { background: #0A141A; border-bottom: 1px solid var(--line-dark); font-size: 13px; }
.topbar__inner { display: flex; align-items: center; justify-content: space-between; height: 42px; gap: 16px; }
.topbar__note { color: var(--txt-dim); letter-spacing: .02em; }
.topbar__lang { display: flex; align-items: center; gap: 14px; }
.topbar__langlabel { color: rgba(234, 241, 245, .4); font-size: 12px; }
.topbar__lang a { color: var(--txt-dim); transition: color .2s; }
.topbar__lang a:hover { color: #fff; }

/* ---------------- 导航 ---------------- */
.header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(15, 29, 36, .78);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: background .3s, border-color .3s;
}
.header.is-stuck { background: rgba(15, 29, 36, .97); border-bottom-color: var(--line-dark); }
.header__inner { display: flex; align-items: center; justify-content: space-between; height: 74px; }

.logo { display: flex; align-items: center; }
.logo__img { height: 46px; width: auto; }
.logo__cn {
  margin-left: 14px; padding-left: 14px; border-left: 1px solid rgba(255, 255, 255, .22);
  font-size: 15px; font-weight: 700; letter-spacing: .2em; color: #fff; white-space: nowrap;
}

.nav { display: flex; align-items: center; gap: 28px; font-size: 15px; font-weight: 500; }
.nav a { color: var(--txt-dim); transition: color .2s; position: relative; padding: 4px 0; }
.nav a::after {
  content: ""; position: absolute; left: 0; bottom: -2px; height: 2px; width: 0;
  background: var(--orange); transition: width .25s;
}
.nav a:hover, .nav a.is-active { color: #fff; }
.nav a:hover::after, .nav a.is-active::after { width: 100%; }
.nav__cta {
  color: #fff !important;
  background: var(--orange);
  padding: 9px 20px !important;
  border-radius: 999px;
  font-weight: 600;
}
.nav__cta::after { display: none; }
.nav__cta:hover { background: var(--orange-2); }

.burger { display: none; width: 44px; height: 44px; border: 0; background: none; cursor: pointer; padding: 10px; }
.burger span { display: block; height: 2px; background: #fff; margin: 5px 0; transition: .3s; }
.burger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.is-open span:nth-child(2) { opacity: 0; }
.burger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------------- HERO ---------------- */
.hero {
  position: relative;
  background: var(--bg);
  padding: 96px 0 110px;
  overflow: hidden;
  isolation: isolate;
}
.hero__bg {
  position: absolute; inset: 0; z-index: -2;
  background: url("../img/hero-1.jpg") center 30% / cover no-repeat;
  filter: saturate(.85);
}
.hero__veil {
  position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(900px 620px at 82% 30%, rgba(0, 120, 190, .30), transparent 62%),
    linear-gradient(92deg, rgba(10, 20, 26, .97) 0%, rgba(10, 20, 26, .9) 42%, rgba(10, 20, 26, .62) 72%, rgba(10, 20, 26, .78) 100%);
}

.hero__inner { display: grid; grid-template-columns: 1.06fr .94fr; gap: 60px; align-items: center; }

.badge {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 7px 16px; border: 1px solid var(--line-dark); border-radius: 999px;
  font-size: 13px; letter-spacing: .06em; color: var(--txt-dark);
  background: rgba(255, 255, 255, .06); backdrop-filter: blur(4px);
}
.badge__dot {
  width: 8px; height: 8px; border-radius: 50%; background: var(--orange);
  box-shadow: 0 0 0 4px rgba(233, 114, 24, .22);
}

.hero__title {
  margin: 26px 0 0;
  font-size: clamp(50px, 6.6vw, 92px);
  font-weight: 800; line-height: .98; letter-spacing: -.03em;
  text-shadow: 0 4px 30px rgba(0, 0, 0, .35);
}
.hero__sub {
  margin-top: 18px;
  font-size: clamp(15px, 1.9vw, 22px); font-weight: 700;
  letter-spacing: .3em; color: #A7C2D4;
}
.hero__lead { margin-top: 26px; max-width: 640px; color: rgba(234, 241, 245, .78); font-size: 16.5px; }

.checklist { margin: 30px 0 0; display: grid; gap: 13px; max-width: 640px; }
.checklist li { position: relative; padding-left: 30px; font-size: 15.5px; }
.checklist li::before {
  content: ""; position: absolute; left: 0; top: 10px;
  width: 16px; height: 9px;
  border-left: 2.5px solid var(--orange); border-bottom: 2.5px solid var(--orange);
  transform: rotate(-45deg);
}

.hero__actions { margin-top: 38px; display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 14px 30px; border-radius: 999px; font-weight: 700; font-size: 15px;
  border: 1px solid transparent; cursor: pointer; transition: .25s;
  font-family: inherit;
}
.btn--primary { background: var(--orange); color: #fff; }
.btn--primary:hover { background: var(--orange-2); transform: translateY(-2px); box-shadow: 0 12px 28px rgba(233, 114, 24, .32); }
.btn--ghost { border-color: rgba(255, 255, 255, .4); color: #fff; }
.btn--ghost:hover { border-color: #fff; background: rgba(255, 255, 255, .08); }
.btn--light { background: #fff; color: var(--ink); }
.btn--light:hover { transform: translateY(-2px); }
.btn--outline { border-color: rgba(255, 255, 255, .45); color: #fff; }
.btn--outline:hover { background: rgba(255, 255, 255, .12); }
.btn--block { width: 100%; }

.stats {
  margin-top: 54px; display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 18px; border-top: 1px solid var(--line-dark); padding-top: 26px;
}
.stat b { display: block; font-size: 32px; font-weight: 800; color: #fff; line-height: 1.15; }
.stat span { font-size: 13px; color: var(--txt-dim); }

.hero__art { position: relative; }
.coil { width: 100%; height: auto; }
.coil .spin { transform-origin: 260px 260px; animation: spin 26s linear infinite; }
.coil .pulse { animation: pulse 4s ease-in-out infinite; transform-origin: 260px 260px; }
.coil .waves circle { animation: wave 3.6s ease-out infinite; transform-origin: 260px 260px; opacity: 0; }
.coil .waves circle:nth-child(2) { animation-delay: 1.2s; }
.coil .waves circle:nth-child(3) { animation-delay: 2.4s; }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 0%, 100% { transform: scale(1); opacity: .8; } 50% { transform: scale(1.08); opacity: 1; } }
@keyframes wave {
  0% { transform: scale(.85); opacity: .8; }
  100% { transform: scale(1.7); opacity: 0; }
}

.hero__tag {
  position: absolute; right: 4%; bottom: 6%;
  background: rgba(12, 24, 30, .58);
  border: 1px solid var(--line-dark);
  backdrop-filter: blur(8px);
  border-radius: 12px; padding: 14px 20px;
}
.hero__tag b { display: block; font-size: 15px; }
.hero__tag span { font-size: 12.5px; color: var(--txt-dim); }

.scrollcue { position: absolute; left: 50%; bottom: 26px; transform: translateX(-50%); display: grid; place-items: center; }
.scrollcue__mouse {
  width: 24px; height: 38px; border: 1.6px solid rgba(255, 255, 255, .5);
  border-radius: 14px; display: grid; justify-items: center; padding-top: 7px;
}
.scrollcue__mouse i {
  width: 3px; height: 7px; border-radius: 2px; background: var(--orange);
  animation: cue 1.7s ease-in-out infinite;
}
@keyframes cue { 0%, 100% { transform: translateY(0); opacity: 1; } 50% { transform: translateY(11px); opacity: .25; } }

/* ---------------- 通用区块 ---------------- */
.section { padding: 110px 0; }
.section--dark { background: var(--bg); color: var(--txt-dark); }
.section--paper { background: var(--paper); color: var(--ink); }

.head { max-width: 820px; margin-bottom: 56px; }
.head--center { max-width: 760px; margin-left: auto; margin-right: auto; text-align: center; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 12px;
  color: var(--blue); font-size: 13px; font-weight: 700; letter-spacing: .18em;
  margin-bottom: 16px;
}
.eyebrow::before { content: ""; width: 34px; height: 2px; background: var(--orange); }
.head--center .eyebrow::after { content: ""; width: 34px; height: 2px; background: var(--orange); }
.eyebrow--light { color: #8FC8E8; }
.eyebrow--light::before { background: #8FC8E8; }

.h2 { font-size: clamp(32px, 4.2vw, 52px); font-weight: 800; letter-spacing: -.02em; }
.head__lead { margin-top: 20px; color: var(--txt-ink-dim); font-size: 16px; }
.section--dark .head__lead { color: var(--txt-dim); }
.formula { color: var(--blue); font-weight: 800; white-space: nowrap; }

/* ---------------- 三支柱卡片 ---------------- */
.cards3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.card {
  background: #fff; border: 1px solid var(--line-light); border-radius: var(--radius);
  padding: 38px 34px 34px; transition: .3s;
  box-shadow: 0 2px 10px rgba(43, 54, 60, .04);
}
.card:hover { transform: translateY(-6px); box-shadow: 0 20px 44px rgba(43, 54, 60, .12); border-color: rgba(0, 120, 190, .35); }
.card__num { font-size: 12.5px; font-weight: 800; letter-spacing: .14em; color: var(--blue); margin-bottom: 14px; }
.card h3 { font-size: 24px; margin-bottom: 14px; }
.card p { color: var(--txt-ink-dim); font-size: 15.5px; }

/* ---------------- 产品系统 ---------------- */
.prod {
  display: grid; grid-template-columns: .92fr 1.08fr; gap: 56px; align-items: center;
  margin-top: 26px;
}
.prod--coil { margin-top: 96px; }
.prod__media { display: grid; place-items: center; padding: 30px; }
.prod__media img { max-height: 430px; width: auto; max-width: 100%; }
.prod__media--coil { padding: 0; }
.prod__spec h3 { font-size: 30px; }
.prod__sub { color: var(--txt-dim); font-size: 14px; letter-spacing: .06em; margin: 8px 0 24px; }

.spec { width: 100%; border-collapse: collapse; font-size: 15px; }
.spec th, .spec td {
  text-align: left; padding: 12px 14px;
  border-bottom: 1px solid var(--line-dark);
  vertical-align: top;
}
.spec th { color: var(--txt-dim); font-weight: 600; white-space: nowrap; width: 8.5em; }
.spec td { color: var(--txt-dark); font-weight: 500; }
.spec tr:first-child th, .spec tr:first-child td { border-top: 1px solid var(--line-dark); }
.spec--light th, .spec--light td { border-bottom-color: var(--line-light); }
.spec--light th { color: var(--txt-ink-dim); }
.spec--light td { color: var(--ink); }
.spec--light tr:first-child th, .spec--light tr:first-child td { border-top-color: var(--line-light); }

.coilgrid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 6px; }
.coilcard {
  background: var(--bg-2); border: 1px solid var(--line-dark); border-radius: 12px;
  padding: 20px 20px 18px; transition: .3s;
}
.coilcard:hover { background: var(--bg-3); border-color: rgba(0, 120, 190, .5); }
.coilcard__no { font-size: 12px; font-weight: 800; color: var(--orange); letter-spacing: .12em; }
.coilcard h4 { font-size: 16.5px; margin: 8px 0 8px; }
.coilcard p { font-size: 13.5px; color: var(--txt-dim); line-height: 1.7; }

/* ---------------- 应用领域 ---------------- */
.apps { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.app {
  background: #fff; border: 1px solid var(--line-light); border-radius: var(--radius);
  overflow: hidden; display: grid; grid-template-columns: 240px 1fr;
  transition: .3s;
}
.app:hover { transform: translateY(-5px); box-shadow: 0 22px 46px rgba(43, 54, 60, .13); }
.app__img { position: relative; overflow: hidden; min-height: 200px; }
.app__img img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
.app:hover .app__img img { transform: scale(1.06); }
.app__body { padding: 26px 28px 24px; }
.app__body h3 { font-size: 21px; margin-bottom: 8px; }
.app__body p { color: var(--txt-ink-dim); font-size: 14.5px; }
.app__stat {
  display: inline-block; margin-top: 14px; padding: 6px 14px;
  background: rgba(0, 120, 190, .08); border: 1px solid rgba(0, 120, 190, .3);
  color: var(--blue); border-radius: 999px; font-size: 13px; font-weight: 700;
}

/* ---------------- 服务 ---------------- */
.svcs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.svc {
  background: var(--bg-2); border: 1px solid var(--line-dark); border-radius: var(--radius);
  padding: 30px 28px; transition: .3s;
}
.svc:hover { border-color: rgba(0, 120, 190, .5); background: var(--bg-3); }
.svc__no { font-size: 13px; font-weight: 800; color: var(--orange); letter-spacing: .14em; }
.svc h3 { font-size: 20px; margin: 12px 0 10px; }
.svc p { color: var(--txt-dim); font-size: 14.5px; }
.svc--cta { background: linear-gradient(140deg, rgba(0, 120, 190, .25), rgba(233, 114, 24, .18)); border-color: rgba(0, 120, 190, .45); display: grid; align-content: center; gap: 12px; }
.svc--cta h3 { margin-top: 0; }

/* ---------------- 功率计算器 ---------------- */
.calc {
  background: #fff; border: 1px solid var(--line-light); border-radius: 20px;
  overflow: hidden; box-shadow: 0 24px 60px rgba(43, 54, 60, .08);
}
.calc__tabs { display: flex; background: #E4EAEE; }
.calc__tab {
  flex: 1; border: 0; background: none; font-family: inherit;
  font-size: 15.5px; font-weight: 700; color: var(--txt-ink-dim);
  padding: 18px 10px; cursor: pointer; transition: .25s;
}
.calc__tab.is-active { background: var(--bg); color: #fff; }
.calc__panel { display: none; padding: 40px 44px 34px; }
.calc__panel.is-active { display: block; }
.calc__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.field { display: grid; gap: 8px; }
.field > span { font-size: 13px; color: var(--txt-ink-dim); letter-spacing: .02em; }
.field input {
  font-family: inherit; font-size: 15px; color: var(--ink);
  background: #F4F7F9; border: 1px solid var(--line-light); border-radius: 10px;
  padding: 12px 14px; outline: none; width: 100%; transition: .2s;
}
.field input:focus { border-color: var(--blue); background: #fff; box-shadow: 0 0 0 3px rgba(0, 120, 190, .12); }

.calc__results { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 26px; }
.res {
  background: #F4F7F9; border: 1px solid var(--line-light); border-radius: 12px;
  padding: 16px 18px 14px;
}
.res > span { font-size: 12.5px; color: var(--txt-ink-dim); letter-spacing: .04em; }
.res b { display: block; font-size: 26px; font-weight: 800; color: var(--ink); line-height: 1.3; }
.res i { font-style: normal; font-size: 12.5px; color: var(--txt-ink-dim); }
.res--hl { background: var(--bg); border-color: var(--bg); }
.res--hl > span { color: var(--txt-dim); }
.res--hl b { color: var(--orange); }
.res--hl i { color: var(--txt-dim); }
.calc__note { margin-top: 18px; font-size: 13px; color: var(--txt-ink-dim); }

/* ---------------- 全球客户 ---------------- */
.clients { padding-bottom: 100px; }
.logos { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.logo-cell {
  display: grid; place-items: center; height: 104px; padding: 16px 20px;
  background: #fff; border: 1px solid rgba(255, 255, 255, .1); border-radius: 12px;
  transition: .28s;
}
.logo-cell img {
  max-width: 100%; max-height: 56px; width: auto; height: auto;
  object-fit: contain; filter: grayscale(1); opacity: .72; transition: .28s;
}
.logo-cell:hover {
  border-color: rgba(0, 120, 190, .6); transform: translateY(-3px);
  box-shadow: 0 14px 30px rgba(0, 0, 0, .35);
}
.logo-cell:hover img { filter: none; opacity: 1; }
.clients__note { margin-top: 22px; font-size: 13px; color: rgba(234, 241, 245, .4); text-align: center; }

/* ---------------- 品牌方 ---------------- */
.about { display: grid; grid-template-columns: 1fr 1.05fr; gap: 56px; align-items: center; }
.about__media { position: relative; }
.about__media img { border-radius: var(--radius); box-shadow: 0 24px 60px rgba(43, 54, 60, .18); }
.about__cap {
  position: absolute; left: 18px; bottom: 18px;
  background: rgba(15, 29, 36, .82); color: #fff; backdrop-filter: blur(6px);
  padding: 9px 16px; border-radius: 10px; font-size: 13px;
}
.about__body > p { color: var(--txt-ink-dim); margin: 20px 0 26px; }

/* ---------------- 联系 CTA ---------------- */
.section--cta {
  background:
    radial-gradient(1000px 520px at 12% 0%, rgba(0, 120, 190, .38), transparent 60%),
    radial-gradient(800px 480px at 90% 100%, rgba(233, 114, 24, .22), transparent 60%),
    linear-gradient(120deg, #18303B, #0F1D24 62%);
  color: var(--txt-dark);
}
.cta { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: start; }
.cta__title { font-size: clamp(32px, 4.2vw, 52px); font-weight: 800; letter-spacing: -.02em; }
.cta__text > p { margin-top: 20px; color: var(--txt-dim); font-size: 16px; max-width: 560px; }
.cta__actions { margin-top: 32px; display: flex; gap: 14px; flex-wrap: wrap; }
.cta__de { margin-top: 26px !important; font-size: 13.5px !important; color: rgba(234, 241, 245, .45) !important; }
.cta__de a { color: #8FC8E8; text-decoration: underline; }

.cta__form {
  background: rgba(255, 255, 255, .05); border: 1px solid var(--line-dark);
  border-radius: var(--radius); padding: 36px 34px;
  display: grid; gap: 14px; backdrop-filter: blur(6px);
}
.cta__form h3 { font-size: 22px; margin-bottom: 6px; }
.cta__form input, .cta__form textarea {
  font-family: inherit; font-size: 15px; color: #fff;
  background: rgba(255, 255, 255, .06);
  border: 1px solid var(--line-dark); border-radius: 10px;
  padding: 13px 14px; outline: none; width: 100%; resize: vertical; transition: .2s;
}
.cta__form input::placeholder, .cta__form textarea::placeholder { color: rgba(234, 241, 245, .45); }
.cta__form input:focus, .cta__form textarea:focus { border-color: var(--blue); background: rgba(255, 255, 255, .1); }
.cta__formnote { font-size: 12.5px; color: var(--txt-dim); text-align: center; margin-top: 2px; }
.cta__formnote.is-ok { color: #7BDCA5; }

/* ---------------- 页脚 ---------------- */
.footer { background: #0A141A; padding: 72px 0 26px; border-top: 1px solid var(--line-dark); }
.footer__inner {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 44px;
  padding-bottom: 46px;
}
.footer__logo { height: 44px; width: auto; }
.footer__brand p { margin-top: 20px; color: var(--txt-dim); font-size: 14.5px; max-width: 360px; }
.footer__col { display: grid; gap: 12px; align-content: start; }
.footer__col h4 { font-size: 15px; margin-bottom: 6px; letter-spacing: .04em; }
.footer__col a, .footer__col span { color: var(--txt-dim); font-size: 14.5px; }
.footer__col a:hover { color: #fff; }
.footer__org { color: #fff !important; font-size: 14px !important; line-height: 1.65; margin: 0 0 4px; padding-bottom: 10px; border-bottom: 1px solid var(--line-dark); }
.footer__org br + * { color: var(--txt-dim); }
.cta__cn { margin-top: 12px !important; font-size: 13.5px !important; color: rgba(234, 241, 245, .62) !important; line-height: 1.8; }
.nowrap { white-space: nowrap; }
.footer__bottom {
  display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap;
  border-top: 1px solid var(--line-dark); padding-top: 22px;
  font-size: 13px; color: rgba(234, 241, 245, .42);
}

/* ---------------- 滚动揭示 ---------------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-in { opacity: 1; transform: none; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 1080px) {
  .hero__inner { grid-template-columns: 1fr; gap: 46px; }
  .hero__art { max-width: 460px; margin: 0 auto; }
  .prod, .prod--coil { grid-template-columns: 1fr; gap: 34px; }
  .prod--coil .prod__media { order: -1; }
  .prod__media img { max-height: 340px; }
  .apps { grid-template-columns: 1fr; }
  .svcs { grid-template-columns: repeat(2, 1fr); }
  .logos { grid-template-columns: repeat(4, 1fr); }
  .footer__inner { grid-template-columns: 1fr 1fr; gap: 36px; }
  .nav { gap: 18px; font-size: 14.5px; }
  .about { grid-template-columns: 1fr; gap: 36px; }
}

@media (max-width: 900px) {
  .nav {
    position: fixed; inset: 116px 0 auto; flex-direction: column; align-items: flex-start;
    gap: 0; background: var(--bg); padding: 20px 32px 28px;
    border-bottom: 1px solid var(--line-dark);
    transform: translateY(-14px); opacity: 0; pointer-events: none; transition: .3s;
  }
  .nav.is-open { transform: none; opacity: 1; pointer-events: auto; }
  .nav a { width: 100%; padding: 14px 0; border-bottom: 1px solid var(--line-dark); }
  .nav a::after { display: none; }
  .nav__cta { text-align: center; margin-top: 16px; border-bottom: 0 !important; }
  .burger { display: block; }
  .topbar__note { display: none; }
  .topbar__inner { justify-content: flex-end; }
  .calc__grid { grid-template-columns: repeat(2, 1fr); }
  .calc__results { grid-template-columns: repeat(2, 1fr); }
  .cards3 { grid-template-columns: 1fr; }
  .cta { grid-template-columns: 1fr; gap: 40px; }
  .app { grid-template-columns: 1fr; }
  .app__img { min-height: 210px; position: relative; }
  .section { padding: 84px 0; }
  .logos { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 680px) {
  .wrap { padding: 0 20px; }
  .svcs { grid-template-columns: 1fr; }
  .logos { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 20px 14px; }
  .hero { padding: 56px 0 90px; }
  .hero__title { font-size: 42px; }
  .hero__sub { letter-spacing: .18em; }
  .logo__cn { display: none; }
  .hero__tag { position: static; margin: 22px auto 0; width: fit-content; }
  .calc__panel { padding: 28px 22px; }
  .coilgrid { grid-template-columns: 1fr; }
  .footer__inner { grid-template-columns: 1fr; }
  .scrollcue { display: none; }
  .logo__img { height: 38px; }
  .gal-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .lb__prev { left: 8px; }
  .lb__next { right: 8px; }
}

/* ===========================================================
   视频与现场图库
   =========================================================== */
.media-video {
  display: grid;
  grid-template-columns: 1.45fr 1fr;
  gap: 44px;
  align-items: center;
  margin-bottom: 72px;
}

.video-frame {
  position: relative;
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: #0A141A;
  aspect-ratio: 16 / 9;
  box-shadow: 0 26px 60px rgba(15, 29, 36, .22);
}
.video-frame video { width: 100%; height: 100%; object-fit: cover; display: block; }

.video-play {
  position: absolute; inset: 0; width: 100%;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(180deg, rgba(15, 29, 36, .1), rgba(15, 29, 36, .5));
  border: 0; cursor: pointer; transition: opacity .3s;
}
.video-play.is-hidden { opacity: 0; pointer-events: none; }
.video-play span {
  width: 92px; height: 92px; border-radius: 50%;
  background: rgba(233, 114, 24, .95);
  display: flex; align-items: center; justify-content: center;
  animation: playPulse 2.2s infinite; transition: transform .2s;
}
.video-play:hover span { transform: scale(1.08); }
.video-play svg { width: 34px; height: 34px; fill: #fff; margin-left: 6px; }
@keyframes playPulse {
  0%   { box-shadow: 0 0 0 0 rgba(233, 114, 24, .55); }
  70%  { box-shadow: 0 0 0 28px rgba(233, 114, 24, 0); }
  100% { box-shadow: 0 0 0 0 rgba(233, 114, 24, 0); }
}

.video-meta h3 { font-size: 28px; margin: 10px 0 14px; color: var(--ink); }
.video-meta p { color: var(--txt-ink-dim); }
.video-meta__list { margin-top: 18px; display: grid; gap: 10px; }
.video-meta__list li {
  position: relative; padding-left: 24px;
  color: var(--ink); font-size: 15px; font-weight: 500;
}
.video-meta__list li::before {
  content: ""; position: absolute; left: 0; top: .55em;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--orange);
}

/* 图库 */
.gal-filters { display: flex; flex-wrap: wrap; gap: 10px; margin: 36px 0 26px; }
.gal-btn {
  border: 1px solid var(--line-light); background: #fff; color: var(--ink);
  border-radius: 999px; padding: 8px 20px; font-size: 14px; font-weight: 600;
  cursor: pointer; font-family: inherit; transition: background .2s, color .2s, border-color .2s;
}
.gal-btn:hover { border-color: var(--blue); color: var(--blue); }
.gal-btn.is-active { background: var(--blue); border-color: var(--blue); color: #fff; }

.gal-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.gal-item {
  position: relative; margin: 0; overflow: hidden; border-radius: 12px;
  cursor: zoom-in; background: #D9E1E6; aspect-ratio: 4 / 3; display: none;
}
.gal-item.is-show { display: block; animation: galIn .35s ease both; }
@keyframes galIn {
  from { opacity: 0; transform: scale(.96); }
  to   { opacity: 1; transform: none; }
}
.gal-item img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.gal-item:hover img { transform: scale(1.07); }
.gal-item figcaption {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 30px 12px 10px; font-size: 12.5px; font-weight: 500; color: #fff;
  background: linear-gradient(180deg, transparent, rgba(15, 29, 36, .88));
  opacity: 0; transition: opacity .25s;
}
.gal-item:hover figcaption { opacity: 1; }

/* 灯箱 */
.lb {
  position: fixed; inset: 0; z-index: 300;
  background: rgba(8, 15, 19, .94);
  display: none; align-items: center; justify-content: center;
  flex-direction: column; padding: 48px 24px;
}
.lb.is-open { display: flex; }
.lb img {
  max-width: min(1100px, 92vw); max-height: 74vh;
  border-radius: 10px; box-shadow: 0 30px 80px rgba(0, 0, 0, .6);
}
.lb__cap { color: var(--txt-dark); margin-top: 16px; font-size: 15px; text-align: center; }
.lb__btn {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 52px; height: 52px; border-radius: 50%;
  border: 1px solid var(--line-dark); background: rgba(255, 255, 255, .08);
  color: #fff; font-size: 24px; cursor: pointer; transition: background .2s;
  line-height: 1;
}
.lb__btn:hover { background: var(--blue); border-color: var(--blue); }
.lb__prev { left: 26px; }
.lb__next { right: 26px; }
.lb__close {
  position: absolute; top: 22px; right: 26px;
  width: 46px; height: 46px; border-radius: 50%;
  border: 1px solid var(--line-dark); background: rgba(255, 255, 255, .08);
  color: #fff; font-size: 18px; cursor: pointer; transition: background .2s;
}
.lb__close:hover { background: var(--orange); border-color: var(--orange); }

@media (max-width: 1080px) {
  .media-video { grid-template-columns: 1fr; gap: 30px; }
  .gal-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 680px) {
  .video-play span { width: 68px; height: 68px; }
  .video-play svg { width: 26px; height: 26px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}