/* ============================================================
   嘉兴酷林科技有限公司 - 企业官网样式
   科技暗色主题 · 蓝青 / 紫渐变
   ============================================================ */

:root {
  --bg: #06091a;
  --bg-2: #0a1430;
  --bg-3: #0e1c44;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-2: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.10);
  --text: #e8eefc;
  --text-dim: #98a6c8;
  --text-mute: #6b7a99;
  --primary: #00d4ff;
  --accent: #6e3aff;
  --accent-2: #00ffa8;
  --grad: linear-gradient(135deg, #00d4ff 0%, #6e3aff 100%);
  --grad-text: linear-gradient(90deg, #00d4ff, #6e3aff, #00ffa8);
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 20px 60px -20px rgba(0, 0, 0, 0.6);
  --maxw: 1200px;
  --t: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; transition: var(--t); }
img, svg { display: block; max-width: 100%; }
ul { list-style: none; }
section { padding: 100px 0; position: relative; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 14px 32px; border-radius: var(--radius-sm);
  font-size: 15px; font-weight: 600; letter-spacing: 0.5px;
  cursor: pointer; border: none; transition: var(--t);
}
.btn-primary {
  background: var(--grad); color: #fff;
  box-shadow: 0 10px 30px -10px rgba(0, 212, 255, 0.5);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 40px -10px rgba(110, 58, 255, 0.7); }
.btn-ghost {
  background: transparent; color: var(--text);
  border: 1px solid var(--border);
}
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-block { width: 100%; }

/* ---------- 通用标题 ---------- */
.sec-head { text-align: center; margin-bottom: 60px; }
.sec-head em {
  display: inline-block; font-size: 13px; letter-spacing: 3px;
  color: var(--primary); margin-bottom: 12px; font-style: normal; font-weight: 600;
}
.sec-head h2 {
  font-size: 38px; font-weight: 800; margin-bottom: 14px;
  background: var(--grad-text); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}
.sec-head p { color: var(--text-dim); font-size: 16px; }

.grad-text {
  background: var(--grad-text); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}

/* ============================================================
   导航
   ============================================================ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 18px 0; transition: var(--t);
  background: transparent;
}
.nav.scrolled {
  padding: 12px 0;
  background: rgba(6, 9, 26, 0.85);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; }
.logo { display: flex; align-items: center; gap: 12px; }
.logo-mark { width: 38px; height: 38px; }
.logo-text { display: flex; flex-direction: column; line-height: 1.15; }
.logo-text strong { font-size: 17px; font-weight: 700; }
.logo-text em { font-size: 11px; color: var(--text-mute); font-style: normal; letter-spacing: 1px; }

.menu { display: flex; gap: 6px; align-items: center; }
.menu a {
  padding: 8px 16px; border-radius: 8px; font-size: 14px; color: var(--text-dim);
}
.menu a:hover { color: var(--text); background: var(--surface); }
.menu .cta-mini {
  background: var(--grad); color: #fff; margin-left: 8px; font-weight: 600;
}
.menu .cta-mini:hover { transform: translateY(-1px); }

.menu-toggle {
  display: none; width: 40px; height: 40px; background: transparent;
  border: 1px solid var(--border); border-radius: 8px; cursor: pointer;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.menu-toggle span {
  width: 18px; height: 2px; background: var(--text); transition: var(--t);
}
.menu-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 语言切换 ---------- */
.nav-tools { display: flex; align-items: center; gap: 10px; }
.lang-switch {
  display: inline-flex; align-items: center; gap: 6px;
  height: 36px; padding: 0 14px; cursor: pointer;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 999px; color: var(--text-dim);
  font-size: 13px; font-weight: 600; letter-spacing: 0.5px;
  transition: var(--t); font-family: inherit;
}
.lang-switch:hover {
  border-color: var(--primary); color: var(--primary);
  background: rgba(0, 212, 255, 0.08);
}
.lang-switch .lang-divider { color: var(--text-mute); font-weight: 400; }
.lang-switch [data-lang-label] { opacity: 0.55; transition: var(--t); }
.lang-switch [data-lang-label].active {
  opacity: 1; color: var(--primary);
  text-shadow: 0 0 12px rgba(0, 212, 255, 0.5);
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  padding: 180px 0 100px; position: relative; overflow: hidden;
  background: radial-gradient(circle at 20% 30%, rgba(0, 212, 255, 0.15), transparent 50%),
              radial-gradient(circle at 80% 70%, rgba(110, 58, 255, 0.18), transparent 50%),
              var(--bg);
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.grid-layer {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.07) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at center, #000 30%, transparent 80%);
}
.orb {
  position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.5;
  animation: float 12s ease-in-out infinite;
}
.orb-1 { width: 400px; height: 400px; background: #00d4ff; top: 10%; left: -5%; }
.orb-2 { width: 500px; height: 500px; background: #6e3aff; bottom: -10%; right: -5%; animation-delay: -6s; }
@keyframes float {
  0%, 100% { transform: translateY(0) translateX(0); }
  50% { transform: translateY(-30px) translateX(20px); }
}

.hero-inner { position: relative; z-index: 2; text-align: center; }
.hero-tag {
  display: inline-block; padding: 6px 16px; border: 1px solid var(--border);
  border-radius: 999px; font-size: 13px; color: var(--text-dim); margin-bottom: 24px;
  background: var(--surface);
}
.hero-title {
  font-size: 64px; font-weight: 900; line-height: 1.15; letter-spacing: 2px;
  margin-bottom: 28px;
}
.hero-desc {
  max-width: 760px; margin: 0 auto 40px; font-size: 17px; color: var(--text-dim); line-height: 1.85;
}
.hero-desc strong { color: var(--text); font-weight: 600; }
.hero-actions { display: flex; gap: 16px; justify-content: center; margin-bottom: 80px; flex-wrap: wrap; }

.hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
  max-width: 820px; margin: 0 auto;
}
.hero-stats li {
  padding: 24px 12px; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); backdrop-filter: blur(10px);
}
.hero-stats strong {
  display: block; font-size: 36px; font-weight: 800;
  background: var(--grad-text); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text; margin-bottom: 4px;
}
.hero-stats span { color: var(--text-dim); font-size: 13px; }

/* ============================================================
   关于我们
   ============================================================ */
.about { background: var(--bg); }
.about-grid {
  display: grid; grid-template-columns: 1.3fr 1fr; gap: 60px; align-items: start;
}
.about-text p {
  color: var(--text-dim); margin-bottom: 20px; font-size: 16px; line-height: 1.95;
}
.about-text strong { color: var(--text); }
.about-points {
  display: flex; flex-direction: column; gap: 18px;
}
.about-points li {
  display: flex; gap: 14px; align-items: flex-start;
  padding: 20px; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); transition: var(--t);
}
.about-points li:hover { border-color: var(--primary); transform: translateX(4px); }
.about-points svg { width: 22px; height: 22px; flex-shrink: 0; color: var(--primary); margin-top: 2px; }
.about-points strong { display: block; font-size: 15px; margin-bottom: 4px; }
.about-points span { color: var(--text-mute); font-size: 13px; }

/* ============================================================
   主营业务
   ============================================================ */
.services {
  background:
    radial-gradient(circle at 50% 0%, rgba(110, 58, 255, 0.08), transparent 50%),
    var(--bg-2);
}
.svc-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.svc-card {
  padding: 32px 28px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius);
  position: relative; overflow: hidden; transition: var(--t);
}
.svc-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--grad); transform: scaleX(0); transform-origin: left;
  transition: var(--t);
}
.svc-card:hover {
  transform: translateY(-6px); border-color: rgba(0, 212, 255, 0.4);
  box-shadow: 0 30px 60px -30px rgba(0, 212, 255, 0.4);
  background: var(--surface-2);
}
.svc-card:hover::before { transform: scaleX(1); }
.svc-icon {
  width: 64px; height: 64px; border-radius: 14px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(110, 58, 255, 0.15));
  border: 1px solid var(--border); display: flex; align-items: center; justify-content: center;
  margin-bottom: 22px; color: var(--primary);
}
.svc-icon svg { width: 36px; height: 36px; }
.svc-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 12px; }
.svc-card p { color: var(--text-dim); font-size: 14px; line-height: 1.8; margin-bottom: 18px; }
.svc-card ul {
  display: flex; flex-wrap: wrap; gap: 8px;
}
.svc-card ul li {
  font-size: 12px; color: var(--text-dim); padding: 4px 10px;
  background: rgba(0, 212, 255, 0.08); border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 6px;
}

/* ============================================================
   核心优势
   ============================================================ */
.advantages { background: var(--bg); }
.adv-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.adv-card {
  padding: 36px 28px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius);
  transition: var(--t); position: relative;
}
.adv-card:hover {
  border-color: var(--accent); transform: translateY(-4px);
  background: var(--surface-2);
}
.adv-num {
  font-size: 56px; font-weight: 900; line-height: 1; margin-bottom: 16px;
  background: var(--grad-text); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text; opacity: 0.85;
}
.adv-card h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; }
.adv-card p { color: var(--text-dim); font-size: 14px; line-height: 1.8; }

/* ============================================================
   行业案例
   ============================================================ */
.cases {
  background:
    radial-gradient(circle at 80% 100%, rgba(0, 255, 168, 0.06), transparent 50%),
    var(--bg-2);
}
.case-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px;
}
.case-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; transition: var(--t);
}
.case-card:hover {
  transform: translateY(-6px); border-color: rgba(0, 212, 255, 0.4);
  box-shadow: 0 30px 60px -30px rgba(0, 0, 0, 0.6);
}
.case-cover { aspect-ratio: 16 / 9; overflow: hidden; background: var(--bg-3); }
.case-cover img,
.case-cover svg {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}
.case-card:hover .case-cover img,
.case-card:hover .case-cover svg { transform: scale(1.06); }
.case-body { padding: 24px 26px 28px; }
.case-tag {
  display: inline-block; font-size: 12px; padding: 4px 12px;
  background: rgba(0, 212, 255, 0.12); color: var(--primary);
  border-radius: 6px; margin-bottom: 14px; letter-spacing: 0.5px;
}
.case-body h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
.case-body p { color: var(--text-dim); font-size: 14px; line-height: 1.75; }

/* ============================================================
   联系我们
   ============================================================ */
.contact { background: var(--bg); }
.contact-grid {
  display: grid; grid-template-columns: 1fr 1.2fr; gap: 50px; align-items: start;
}
.contact-info { display: flex; flex-direction: column; gap: 20px; }
.contact-info li {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 22px; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); transition: var(--t);
}
.contact-info li:hover { border-color: var(--primary); }
.contact-info svg {
  width: 28px; height: 28px; flex-shrink: 0; color: var(--primary);
}
.contact-info strong { display: block; font-size: 14px; margin-bottom: 4px; }
.contact-info span { color: var(--text-dim); font-size: 14px; }

.qr-grid {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px;
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px;
}
.qr-card {
  display: flex; flex-direction: column; align-items: center; text-align: center;
  padding: 22px 14px; background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border); border-radius: 12px;
  transition: var(--t);
}
.qr-card:hover {
  border-color: var(--primary); transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}
.qr-img {
  width: 150px; height: 150px; padding: 10px; margin-bottom: 14px;
  background: #fff; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
}
.qr-img img { width: 100%; height: 100%; object-fit: contain; display: block; }
.qr-card strong { font-size: 16px; margin-bottom: 4px; }
.qr-card span { color: var(--text-dim); font-size: 13px; line-height: 1.5; }

/* ============================================================
   页脚
   ============================================================ */
.footer {
  background: var(--bg-2); border-top: 1px solid var(--border);
  padding: 60px 0 0;
}
.footer-inner {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1.2fr; gap: 40px;
  padding-bottom: 40px;
}
.footer-brand .logo { margin-bottom: 16px; }
.footer-brand p { color: var(--text-mute); font-size: 13px; line-height: 1.8; }
.footer-col h4 {
  font-size: 14px; font-weight: 700; margin-bottom: 16px; color: var(--text);
}
.footer-col a, .footer-col span {
  display: block; color: var(--text-mute); font-size: 13px;
  margin-bottom: 10px; transition: var(--t);
}
.footer-col a:hover { color: var(--primary); }
.footer-bottom {
  border-top: 1px solid var(--border); padding: 20px 0;
}
.footer-bottom .container {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
}
.footer-bottom span { color: var(--text-mute); font-size: 12px; }

/* ============================================================
   返回顶部
   ============================================================ */
.back-top {
  position: fixed; right: 28px; bottom: 28px; z-index: 50;
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--grad); color: #fff; border: none; cursor: pointer;
  font-size: 22px; opacity: 0; pointer-events: none;
  transition: var(--t); box-shadow: 0 10px 30px -8px rgba(0, 212, 255, 0.6);
}
.back-top.show { opacity: 1; pointer-events: auto; }
.back-top:hover { transform: translateY(-3px); }

/* ============================================================
   滚动渐入动画
   ============================================================ */
.fade-up {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-up.in { opacity: 1; transform: translateY(0); }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .hero-title { font-size: 50px; }
  .svc-grid, .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  section { padding: 70px 0; }
  .container { padding: 0 18px; }
  .hero { padding: 130px 0 70px; }
  .hero-title { font-size: 36px; letter-spacing: 1px; }
  .hero-desc { font-size: 15px; }
  .hero-actions { gap: 12px; }
  .btn { padding: 12px 22px; font-size: 14px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .hero-stats strong { font-size: 28px; }
  .sec-head h2 { font-size: 28px; }

  /* 移动端菜单 */
  .menu-toggle { display: flex; }
  .menu {
    position: fixed; top: 70px; left: 0; right: 0; bottom: 0;
    flex-direction: column; gap: 4px; padding: 24px 18px;
    background: rgba(6, 9, 26, 0.96); backdrop-filter: blur(14px);
    transform: translateX(100%); transition: var(--t);
    align-items: stretch; overflow-y: auto;
  }
  .menu.open { transform: translateX(0); }
  .menu a { padding: 14px 16px; font-size: 15px; }
  .menu .cta-mini { margin: 8px 0 0; text-align: center; }

  /* 移动端语言切换按钮保持可见但更紧凑 */
  .lang-switch { height: 34px; padding: 0 11px; font-size: 12px; }
  .logo-text em { display: none; }

  .svc-grid, .adv-grid, .case-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 30px; }
  /* 二维码始终保持 2×2(上面两个、下面两个),仅缩小尺寸适配窄屏 */
  .qr-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; padding: 18px; }
  .qr-card { padding: 14px 8px; }
  .qr-img { width: 110px; height: 110px; padding: 6px; margin-bottom: 10px; }
  .qr-card strong { font-size: 14px; }
  .qr-card span { font-size: 12px; }
  .footer-inner { grid-template-columns: 1fr; gap: 30px; }
  .footer-bottom .container { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 30px; }
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .sec-head h2 { font-size: 24px; }
}