/* =========================================================
   瑞泉水处理 - 反渗透设备营销站 样式
   风格：工业简约、深水蓝主色、强调橙CTA
   ========================================================= */

*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Source Han Sans CN", "Noto Sans CJK SC", "Hiragino Sans GB", "HarmonyOS Sans SC", sans-serif;
  color: #0F172A;
  background: #FFFFFF;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color .2s ease; }
a:hover { color: #E8742C; }
button { font: inherit; cursor: pointer; border: none; background: none; }

:root {
  --c-primary: #0B3D7A;
  --c-primary-dark: #082A55;
  --c-accent: #E8742C;
  --c-accent-dark: #C75D1D;
  --c-ink: #0F172A;
  --c-muted: #64748B;
  --c-line: #E2E8F0;
  --c-soft: #F5F7FA;
  --c-card: #FFFFFF;
  --radius: 10px;
  --shadow-sm: 0 1px 2px rgba(15,23,42,.04), 0 1px 3px rgba(15,23,42,.06);
  --shadow-md: 0 4px 10px rgba(15,23,42,.06), 0 8px 24px rgba(15,23,42,.08);
  --shadow-lg: 0 12px 32px rgba(15,23,42,.12);
  --max: 1240px;
}

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ========== 顶部公告条 ========== */
.topbar {
  background: var(--c-primary-dark);
  color: rgba(255,255,255,.85);
  font-size: 12.5px;
  letter-spacing: .02em;
}
.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 36px;
  flex-wrap: wrap;
  gap: 8px;
}
.topbar-links a { color: rgba(255,255,255,.92); }
.topbar-links a:hover { color: var(--c-accent); }
.topbar .dot { margin: 0 8px; color: rgba(255,255,255,.4); }

/* ========== 顶部导航 + Banner 一体 ========== */
.hero {
  position: relative;
  color: #fff;
  background: var(--c-primary-dark);
  overflow: hidden;
  isolation: isolate;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse at top right, rgba(11,61,122,.95) 0%, rgba(8,42,85,1) 60%, #051E3D 100%);
}
.hero-bg canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: .55;
  mix-blend-mode: screen;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 80% 20%, rgba(91,124,153,.25), transparent 50%),
    radial-gradient(circle at 20% 80%, rgba(232,116,44,.15), transparent 60%);
  pointer-events: none;
}

.navbar {
  position: relative;
  z-index: 5;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  background: rgba(8,42,85,.55);
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 24px;
}
.logo {
  display: inline-flex;
  align-items: center;
  color: #fff;
  font-weight: 700;
  font-size: 22px;
  letter-spacing: .04em;
  white-space: nowrap;
}
.logo:hover { color: #fff; }
.logo-main { font-size: 22px; }
.logo-sep { margin: 0 12px; color: var(--c-accent); font-weight: 400; font-size: 22px; }
.logo-sub { font-size: 22px; font-weight: 500; }

.nav-list {
  display: flex;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-list a {
  display: inline-block;
  padding: 10px 14px;
  color: rgba(255,255,255,.86);
  font-size: 15px;
  font-weight: 500;
  border-radius: 6px;
  transition: all .2s;
}
.nav-list a:hover {
  color: #fff;
  background: rgba(255,255,255,.08);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all .25s;
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.hero-content {
  position: relative;
  z-index: 4;
  display: grid;
  grid-template-columns: 1.4fr .9fr;
  gap: 48px;
  padding: 80px 24px 120px;
  align-items: center;
}
.hero-tag {
  display: inline-block;
  padding: 6px 14px;
  background: rgba(232,116,44,.15);
  color: #FFB27D;
  font-size: 13px;
  letter-spacing: .08em;
  border-radius: 100px;
  border: 1px solid rgba(232,116,44,.35);
  margin: 0 0 18px;
}
.hero-title {
  font-size: clamp(34px, 4.4vw, 56px);
  line-height: 1.18;
  font-weight: 800;
  margin: 0 0 18px;
  letter-spacing: -.01em;
}
.hero-title span {
  background: linear-gradient(90deg, #FFB27D, #E8742C);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-desc {
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(255,255,255,.82);
  max-width: 720px;
  margin: 0 0 28px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 0 26px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: .04em;
  transition: all .25s ease;
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: var(--c-accent);
  color: #fff;
  box-shadow: 0 8px 24px rgba(232,116,44,.35);
}
.btn-primary:hover {
  background: var(--c-accent-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 10px 28px rgba(232,116,44,.45);
}
.btn-ghost {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,.4);
}
.btn-ghost:hover {
  background: rgba(255,255,255,.1);
  color: #fff;
  border-color: #fff;
}
.btn-block { width: 100%; }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  list-style: none;
  margin: 40px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid rgba(255,255,255,.15);
}
.hero-stats li {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.hero-stats strong {
  font-size: 28px;
  font-weight: 800;
  color: #FFB27D;
  letter-spacing: .02em;
}
.hero-stats span {
  font-size: 13px;
  color: rgba(255,255,255,.7);
}

.hero-card {
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 14px;
  padding: 28px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 20px 50px rgba(0,0,0,.25);
}
.hero-card-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(255,255,255,.18);
}
.hero-card-list { list-style: none; padding: 0; margin: 0 0 22px; }
.hero-card-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  font-size: 14.5px;
  border-bottom: 1px dashed rgba(255,255,255,.1);
}
.hero-card-list li:last-child { border-bottom: 0; }
.hero-card-list span { color: rgba(255,255,255,.6); }
.hero-card-list a { color: #FFB27D; font-weight: 600; }
.hero-card-list em { color: rgba(255,255,255,.9); font-style: normal; }

.hero-scroll {
  position: absolute;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  width: 26px;
  height: 42px;
  border: 2px solid rgba(255,255,255,.4);
  border-radius: 14px;
  z-index: 4;
}
.hero-scroll span {
  position: absolute;
  top: 8px;
  left: 50%;
  width: 4px;
  height: 8px;
  background: #fff;
  border-radius: 2px;
  transform: translateX(-50%);
  animation: scrollHint 1.6s infinite;
}
@keyframes scrollHint {
  0%   { opacity: 1; transform: translate(-50%, 0); }
  100% { opacity: 0; transform: translate(-50%, 16px); }
}

/* ========== 通用 section ========== */
.section { padding: 96px 0; position: relative; }
.section + .section { border-top: 1px solid var(--c-line); }
.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px;
}
.eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: .25em;
  color: var(--c-accent);
  font-weight: 700;
}
.section-head h2 {
  font-size: clamp(26px, 3.2vw, 38px);
  font-weight: 800;
  letter-spacing: -.01em;
  margin: 0 0 14px;
  color: var(--c-ink);
}
.section-sub {
  color: var(--c-muted);
  font-size: 15.5px;
  margin: 0;
}

/* ========== 关于瑞泉 ========== */
.about { background: var(--c-soft); }
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 56px;
  align-items: center;
}
.about-text p {
  font-size: 15.5px;
  color: #334155;
  margin: 0 0 16px;
}
.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}
.about-tags span {
  display: inline-block;
  padding: 6px 14px;
  background: #fff;
  color: var(--c-primary);
  border: 1px solid var(--c-line);
  border-radius: 100px;
  font-size: 13.5px;
  font-weight: 500;
}
.about-pic img {
  width: 100%;
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 4/3;
  object-fit: cover;
}

/* ========== 产品中心 ========== */
.products { background: #fff; }
.product-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-bottom: 20px;
}
.filter-btn {
  padding: 8px 18px;
  background: var(--c-soft);
  color: #334155;
  border: 1px solid var(--c-line);
  border-radius: 100px;
  font-size: 14px;
  font-weight: 500;
  transition: all .2s;
}
.filter-btn:hover { color: var(--c-primary); border-color: var(--c-primary); }
.filter-btn.active {
  background: var(--c-primary);
  color: #fff;
  border-color: var(--c-primary);
  box-shadow: 0 4px 12px rgba(11,61,122,.25);
}
.product-search {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 36px;
}
.product-search input {
  width: 360px;
  max-width: 100%;
  height: 44px;
  padding: 0 18px;
  border: 1px solid var(--c-line);
  border-radius: 100px;
  font-size: 14.5px;
  outline: none;
  background: #fff;
  transition: border-color .2s, box-shadow .2s;
}
.product-search input:focus {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(11,61,122,.12);
}
.product-count {
  color: var(--c-muted);
  font-size: 13.5px;
}
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.product-card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: 12px;
  overflow: hidden;
  transition: all .25s ease;
  display: flex;
  flex-direction: column;
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(11,61,122,.2);
}
.product-img {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
  background: var(--c-soft);
  cursor: zoom-in;
}
.product-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s ease;
}
.product-card:hover .product-img img { transform: scale(1.06); }
.product-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  padding: 4px 10px;
  background: rgba(11,61,122,.9);
  color: #fff;
  font-size: 12px;
  font-weight: 500;
  border-radius: 100px;
  letter-spacing: .02em;
}
.product-info { padding: 16px 16px 18px; flex: 1; display: flex; flex-direction: column; }
.product-name {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--c-ink);
  margin: 0 0 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 44px;
}
.product-desc {
  font-size: 13px;
  color: var(--c-muted);
  line-height: 1.6;
  margin: 0 0 14px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.product-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 12px;
  border-top: 1px dashed var(--c-line);
  font-size: 12.5px;
  color: var(--c-muted);
}
.product-meta .pm-link { color: var(--c-accent); font-weight: 600; }

.product-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  color: var(--c-muted);
  background: var(--c-soft);
  border-radius: 12px;
}

/* ========== 行业方案 ========== */
.solutions { background: var(--c-soft); }
.solution-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}
.solution-card {
  background: #fff;
  border-radius: 12px;
  padding: 28px 22px;
  box-shadow: var(--shadow-sm);
  transition: all .25s ease;
  border: 1px solid transparent;
}
.solution-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(11,61,122,.18);
}
.solution-card .ic { font-size: 32px; line-height: 1; margin-bottom: 14px; }
.solution-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--c-ink);
}
.solution-card p {
  margin: 0;
  color: var(--c-muted);
  font-size: 13.5px;
  line-height: 1.7;
}

/* ========== 厂家优势 ========== */
.advantage { background: #fff; }
.advantage-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}
.advantage-item {
  position: relative;
  padding: 32px 26px 28px;
  border-radius: 12px;
  background: var(--c-soft);
  border: 1px solid var(--c-line);
  transition: all .25s ease;
}
.advantage-item:hover {
  background: #fff;
  border-color: rgba(11,61,122,.2);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.adv-num {
  font-size: 36px;
  font-weight: 800;
  color: var(--c-primary);
  opacity: .15;
  position: absolute;
  top: 14px;
  right: 22px;
  line-height: 1;
  font-family: Georgia, serif;
}
.advantage-item h3 {
  font-size: 19px;
  font-weight: 700;
  margin: 0 0 10px;
  color: var(--c-ink);
}
.advantage-item p {
  margin: 0;
  color: var(--c-muted);
  font-size: 14.5px;
  line-height: 1.75;
}

/* ========== FAQ ========== */
.faq { background: var(--c-soft); }
.faq-list { max-width: 980px; margin: 0 auto; }
.faq-item {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: 10px;
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color .2s, box-shadow .2s;
}
.faq-item.open { border-color: rgba(11,61,122,.3); box-shadow: var(--shadow-sm); }
.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 18px 22px;
  text-align: left;
  font-size: 16px;
  font-weight: 600;
  color: var(--c-ink);
  background: transparent;
}
.faq-q::before {
  content: 'Q';
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  line-height: 28px;
  text-align: center;
  background: var(--c-primary);
  color: #fff;
  font-weight: 800;
  border-radius: 6px;
  font-size: 13.5px;
}
.faq-q-text { flex: 1; }
.faq-icon {
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  position: relative;
  color: var(--c-primary);
}
.faq-icon::before, .faq-icon::after {
  content: '';
  position: absolute;
  background: currentColor;
  top: 50%;
  left: 50%;
  transition: transform .25s;
}
.faq-icon::before { width: 14px; height: 2px; transform: translate(-50%, -50%); }
.faq-icon::after  { width: 2px; height: 14px; transform: translate(-50%, -50%); }
.faq-item.open .faq-icon::after { transform: translate(-50%, -50%) scaleY(0); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease;
}
.faq-a-inner {
  padding: 0 22px 22px 66px;
  color: #475569;
  font-size: 15px;
  line-height: 1.85;
  position: relative;
}
.faq-a-inner::before {
  content: 'A';
  position: absolute;
  left: 22px;
  top: 0;
  width: 28px;
  height: 28px;
  line-height: 28px;
  text-align: center;
  background: var(--c-accent);
  color: #fff;
  font-weight: 800;
  border-radius: 6px;
  font-size: 13.5px;
}

/* ========== 相关产品站 ========== */
.related { background: #fff; }
.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.related-card {
  display: flex;
  flex-direction: column;
  padding: 22px 24px;
  background: var(--c-soft);
  border: 1px solid var(--c-line);
  border-radius: 10px;
  transition: all .25s;
  border-left: 3px solid var(--c-primary);
}
.related-card:hover {
  background: var(--c-primary);
  color: #fff;
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}
.related-card:hover .related-url { color: rgba(255,255,255,.8); }
.related-name { font-size: 17px; font-weight: 700; margin-bottom: 4px; }
.related-url { font-size: 13px; color: var(--c-muted); font-family: ui-monospace, SFMono-Regular, "Menlo", monospace; }

/* ========== 联系方式 ========== */
.contact { background: linear-gradient(180deg, var(--c-soft) 0%, #fff 100%); }
.contact-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact-info {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: 14px;
  padding: 32px;
  box-shadow: var(--shadow-sm);
}
.contact-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--c-line);
}
.contact-item:last-child { border-bottom: 0; }
.ci-title {
  font-size: 13px;
  color: var(--c-muted);
  font-weight: 600;
  letter-spacing: .04em;
}
.contact-item p {
  margin: 0;
  font-size: 16px;
  color: var(--c-ink);
  font-weight: 500;
}
.contact-item a { color: var(--c-primary); font-weight: 700; }
.contact-item a:hover { color: var(--c-accent); }

.qr-card {
  background: #fff;
  border: 1px solid var(--c-line);
  border-radius: 14px;
  padding: 28px 24px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 24px;
}
.qr-card img {
  width: 220px;
  height: 220px;
  margin: 0 auto 18px;
  border-radius: 8px;
  background: #fff;
}
.qr-card p {
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 4px;
  color: var(--c-ink);
}
.qr-card span {
  font-size: 13.5px;
  color: var(--c-muted);
}

/* ========== 底部 ========== */
.footer {
  background: #0B2545;
  color: rgba(255,255,255,.78);
  padding: 56px 0 0;
  margin-top: 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin: 0 0 16px;
  letter-spacing: .04em;
}
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin-bottom: 8px; }
.footer-col a { color: rgba(255,255,255,.7); font-size: 14px; }
.footer-col a:hover { color: var(--c-accent); }
.footer-col p {
  font-size: 14px;
  line-height: 1.8;
  margin: 14px 0 0;
  color: rgba(255,255,255,.65);
}
.footer-logo {
  font-size: 19px;
  font-weight: 700;
  color: #fff;
  letter-spacing: .04em;
}
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.1);
  padding: 20px 0;
  font-size: 13px;
  color: rgba(255,255,255,.55);
  text-align: center;
}
.footer-bottom p { margin: 4px 0; }
.footer-bottom a { color: rgba(255,255,255,.75); }
.footer-bottom a:hover { color: var(--c-accent); }

/* ========== 右侧悬浮 ========== */
.floats {
  position: fixed;
  right: 16px;
  bottom: 30px;
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.float-btn {
  width: 56px;
  height: 56px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  background: var(--c-primary);
  color: #fff;
  border-radius: 12px;
  font-size: 11px;
  box-shadow: 0 6px 16px rgba(11,61,122,.3);
  transition: all .25s;
}
.float-btn:hover { background: var(--c-accent); color: #fff; transform: translateY(-2px); }

/* ========== 灯箱 ========== */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(8,20,40,.92);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 40px;
  backdrop-filter: blur(6px);
}
.lightbox.show { display: flex; }
.lightbox figure {
  margin: 0;
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.lightbox img {
  max-width: 100%;
  max-height: 80vh;
  border-radius: 6px;
  box-shadow: 0 20px 50px rgba(0,0,0,.5);
}
.lightbox figcaption {
  color: #fff;
  font-size: 15px;
  text-align: center;
  letter-spacing: .03em;
}
.lb-close, .lb-prev, .lb-next {
  position: absolute;
  width: 48px;
  height: 48px;
  background: rgba(255,255,255,.1);
  color: #fff;
  font-size: 26px;
  line-height: 48px;
  text-align: center;
  border-radius: 50%;
  transition: all .2s;
}
.lb-close { top: 24px; right: 24px; font-size: 30px; }
.lb-prev  { left: 24px; top: 50%; transform: translateY(-50%); }
.lb-next  { right: 24px; top: 50%; transform: translateY(-50%); }
.lb-close:hover, .lb-prev:hover, .lb-next:hover { background: var(--c-accent); }

/* ========== 响应式 ========== */
@media (max-width: 1080px) {
  .product-grid { grid-template-columns: repeat(3, 1fr); }
  .solution-grid { grid-template-columns: repeat(3, 1fr); }
  .advantage-grid { grid-template-columns: repeat(2, 1fr); }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .hero-content { grid-template-columns: 1.4fr .9fr; gap: 32px; padding: 60px 24px 100px; }
}
@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .nav-list {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--c-primary-dark);
    flex-direction: column;
    padding: 12px 24px 18px;
    border-top: 1px solid rgba(255,255,255,.1);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: all .25s;
  }
  .nav-list.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-list a { display: block; padding: 12px 8px; border-bottom: 1px solid rgba(255,255,255,.08); }
  .logo-main, .logo-sub, .logo-sep { font-size: 18px; }
  .logo-sep { margin: 0 8px; }

  .hero-content { grid-template-columns: 1fr; padding: 48px 24px 80px; gap: 32px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 18px 24px; }
  .hero-scroll { display: none; }
  .section { padding: 64px 0; }
  .section-head { margin-bottom: 36px; }
  .about-grid { grid-template-columns: 1fr; gap: 28px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .solution-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .advantage-grid { grid-template-columns: 1fr; gap: 14px; }
  .related-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; padding-bottom: 28px; }
  .contact-info, .qr-card { padding: 24px; }
  .qr-card { position: static; }
  .floats { right: 10px; bottom: 16px; }
  .float-btn { width: 48px; height: 48px; font-size: 10px; }
  .topbar-inner { font-size: 12px; height: auto; padding: 8px 0; }
  .product-search input { width: 100%; }
  .product-search { flex-direction: column; }
}
@media (max-width: 480px) {
  .product-grid { grid-template-columns: 1fr; }
  .solution-grid { grid-template-columns: 1fr; }
  .container { padding: 0 18px; }
  .hero-title { font-size: 30px; }
  .logo-main, .logo-sub, .logo-sep { font-size: 16px; }
  .logo-sep { margin: 0 6px; }
}

/* ========== 滚动入场动画 ========== */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .8s ease, transform .8s ease; }
.reveal.in { opacity: 1; transform: translateY(0); }