/* ===== 基础重置 & CSS变量 ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --primary: #1a6cff;
  --primary-dark: #0048d9;
  --primary-light: #4d8fff;
  --secondary: #22c55e;
  --accent: #f59e0b;
  --dark: #0a1628;
  --dark-2: #0d2240;
  --dark-3: #1a3060;
  --gray-100: #f8fafc;
  --gray-200: #f1f5f9;
  --gray-300: #e2e8f0;
  --gray-400: #cbd5e1;
  --gray-500: #94a3b8;
  --gray-600: #64748b;
  --gray-700: #475569;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  --text: #1e293b;
  --text-light: #64748b;
  --white: #ffffff;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 48px rgba(0,0,0,0.15);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --nav-height: 70px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--white);
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

/* ===== 通用容器 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== 通用按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: var(--white);
}
.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(26,108,255,0.3);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255,255,255,0.6);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.15);
  border-color: var(--white);
}

.btn-secondary {
  background: var(--gray-200);
  color: var(--text);
}
.btn-secondary:hover {
  background: var(--gray-300);
  transform: translateY(-2px);
}

.btn-full {
  width: 100%;
  justify-content: center;
}

.btn-sm {
  padding: 8px 20px;
  font-size: 14px;
}

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--primary);
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
}
.link-more:hover {
  gap: 10px;
  color: var(--primary-dark);
}

/* ===== Section 通用 ===== */
.section {
  padding: 80px 0;
  position: relative;
}
.section-light { background: var(--white); }
.section-gray { background: var(--gray-100); }
.section-dark {
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 60%, var(--dark-3) 100%);
  color: var(--white);
}

/* 通用装饰性背景伪元素 */
.section > .container {
  position: relative;
  z-index: 1;
}

/* ===== 各 section 背景纹理 / 图案 ===== */

/* 企业优势 section — 斜线纹理 + 光晕 */
.advantages {
  position: relative;
  overflow: hidden;
}
.advantages::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    repeating-linear-gradient(
      45deg,
      rgba(255,255,255,0.03) 0px,
      rgba(255,255,255,0.03) 1px,
      transparent 1px,
      transparent 14px
    );
}
.advantages::after {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(26,108,255,0.15) 0%, transparent 70%);
  top: -200px;
  right: -100px;
  pointer-events: none;
  z-index: 0;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-header.left { text-align: left; }
.section-header.light h2,
.section-header.light p { color: var(--white); }

.section-tag {
  display: inline-block;
  background: rgba(26,108,255,0.1);
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 14px;
}
.section-dark .section-tag {
  background: rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.8);
}

.section-header h2 {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--gray-900);
  margin-bottom: 14px;
}
.section-header p {
  font-size: 16px;
  color: var(--gray-600);
  max-width: 600px;
  margin: 0 auto;
}
.section-header.left p { margin: 0; }
.section-dark .section-header h2 { color: var(--white); }
.section-dark .section-header p { color: rgba(255,255,255,0.7); }

/* ===== 导航 ===== */
#header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: var(--transition);
}
#header.scrolled {
  background: rgba(10, 22, 40, 0.97);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 30px rgba(0,0,0,0.3);
}

.navbar {
  padding: 0;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}
.logo-icon {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 20px;
}
.logo-text { display: flex; flex-direction: column; }
.logo-main {
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
  line-height: 1.2;
}
.logo-sub {
  font-size: 11px;
  color: rgba(255,255,255,0.6);
  line-height: 1;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-link {
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: rgba(255,255,255,0.8);
  border-radius: 8px;
  transition: var(--transition);
}
.nav-link:hover,
.nav-link.active {
  color: var(--white);
  background: rgba(255,255,255,0.1);
}
.nav-link.nav-cta {
  background: var(--primary);
  color: var(--white);
  padding: 8px 18px;
}
.nav-link.nav-cta:hover {
  background: var(--primary-dark);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== Hero Banner ===== */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  overflow: hidden;
}

/* Hero 全局科技感网格叠加层 */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(26,108,255,0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26,108,255,0.07) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 90% 80% at 50% 50%, black 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 90% 80% at 50% 50%, black 30%, transparent 100%);
}

/* Hero 底部渐变遮罩 */
.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 180px;
  z-index: 2;
  pointer-events: none;
  background: linear-gradient(to top, rgba(0,0,0,0.4), transparent);
}

.hero-slides {
  height: 100%;
  position: relative;
  z-index: 1;
}

.hero-slide {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  opacity: 0;
  transition: opacity 0.7s ease;
  padding: 0 24px;
  background-size: cover !important;
  background-position: center !important;
}
.hero-slide.active { opacity: 1; z-index: 1; }

/* 每张幻灯片单独背景图（渐变叠加在图片上）*/
.hero-slide:nth-child(1) {
  background:
    linear-gradient(135deg, rgba(10,22,40,0.88) 0%, rgba(13,43,78,0.82) 50%, rgba(26,58,107,0.78) 100%),
    url('https://images.unsplash.com/photo-1555066931-4365d14bab8c?w=1600&q=80&auto=format&fit=crop') center/cover no-repeat !important;
}
.hero-slide:nth-child(2) {
  background:
    linear-gradient(135deg, rgba(13,31,18,0.88) 0%, rgba(15,51,32,0.82) 50%, rgba(26,92,53,0.78) 100%),
    url('https://images.unsplash.com/photo-1558618666-fcd25c85cd64?w=1600&q=80&auto=format&fit=crop') center/cover no-repeat !important;
}
.hero-slide:nth-child(3) {
  background:
    linear-gradient(135deg, rgba(26,10,40,0.88) 0%, rgba(45,21,80,0.82) 50%, rgba(74,32,128,0.78) 100%),
    url('https://images.unsplash.com/photo-1518770660439-4636190af475?w=1600&q=80&auto=format&fit=crop') center/cover no-repeat !important;
}

.hero-slide .container {
  width: 100%;
  max-width: 1200px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 60px;
  position: relative;
  z-index: 3;
}

.hero-content {
  flex: 1;
  color: var(--white);
  padding-top: var(--nav-height);
  position: relative;
  z-index: 3;
}

.hero-badge {
  display: inline-block;
  background: rgba(26,108,255,0.25);
  border: 1px solid rgba(26,108,255,0.5);
  color: #7cb9ff;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  padding: 5px 16px;
  border-radius: 20px;
  margin-bottom: 20px;
}

.hero-content h1 {
  font-size: 52px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.hero-content p {
  font-size: 18px;
  color: rgba(255,255,255,0.75);
  margin-bottom: 36px;
  max-width: 480px;
}

.hero-btns {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-visual {
  flex: 0 0 340px;
  position: relative;
  height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 3;
}

.float-card {
  position: absolute;
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 12px;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--white);
  font-size: 14px;
  font-weight: 600;
  animation: floatAnim 3s ease-in-out infinite;
}
.float-card i { font-size: 22px; color: #7cb9ff; }
.float-card.card1 { top: 20px; left: 0; animation-delay: 0s; }
.float-card.card2 { top: 50%; right: 0; transform: translateY(-50%); animation-delay: 0.5s; }
.float-card.card3 { bottom: 20px; left: 40px; animation-delay: 1s; }

@keyframes floatAnim {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
.float-card.card2 {
  animation-name: floatAnim2;
}
@keyframes floatAnim2 {
  0%, 100% { transform: translateY(-50%); }
  50% { transform: translateY(calc(-50% - 10px)); }
}

.hero-dots {
  position: absolute;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 10;
}
.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  cursor: pointer;
  transition: var(--transition);
}
.dot.active {
  width: 28px;
  border-radius: 4px;
  background: var(--white);
}

.hero-prev, .hero-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.25);
  color: var(--white);
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
  transition: var(--transition);
  font-size: 16px;
}
.hero-prev { left: 24px; }
.hero-next { right: 24px; }
.hero-prev:hover, .hero-next:hover { background: rgba(255,255,255,0.3); }

.video-notice {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.85);
  font-size: 13px;
  padding: 10px 22px;
  border-radius: 30px;
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 10;
  white-space: nowrap;
}
.video-notice i { color: #07c160; font-size: 16px; }
.video-notice strong { color: var(--white); }

/* ===== 核心业务 ===== */
.biz-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.biz-card {
  padding: 40px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  transition: var(--transition);
  background: var(--white);
}
.biz-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.biz-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: var(--white);
  margin-bottom: 20px;
}

.biz-card h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--gray-900);
}

.biz-card p {
  color: var(--gray-600);
  line-height: 1.8;
  margin-bottom: 20px;
}

/* ===== 企业优势 ===== */
.adv-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.adv-item {
  text-align: center;
  padding: 36px 24px;
  border-radius: var(--radius);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  transition: var(--transition);
}
.adv-item:hover {
  background: rgba(255,255,255,0.1);
  transform: translateY(-4px);
}

.adv-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  color: var(--white);
  margin: 0 auto 18px;
}

.adv-item h4 {
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 10px;
}

.adv-item p {
  font-size: 14px;
  color: rgba(255,255,255,0.65);
  line-height: 1.7;
}

/* ===== 产品 Tab ===== */
.product-tabs { margin-top: 20px; }

.tab-btns {
  display: flex;
  gap: 12px;
  margin-bottom: 32px;
  border-bottom: 2px solid var(--gray-200);
  padding-bottom: 0;
}

.tab-btn {
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--gray-500);
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: var(--transition);
}
.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.tab-content { display: none; }
.tab-content.active { display: block; }

.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.product-card {
  padding: 28px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  text-align: center;
  transition: var(--transition);
}
.product-card:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 20px rgba(26,108,255,0.1);
  transform: translateY(-4px);
}

.product-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, rgba(26,108,255,0.1), rgba(26,108,255,0.2));
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--primary);
  margin: 0 auto 14px;
}

.product-card h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.product-card p {
  font-size: 13px;
  color: var(--gray-500);
  line-height: 1.6;
}

/* ===== 两列区块 ===== */
.two-col-section {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 60px;
}

.case-list { margin-bottom: 24px; }

.case-item {
  display: flex;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--gray-200);
}
.case-item:last-child { border-bottom: none; }

.case-thumb {
  width: 60px;
  height: 60px;
  border-radius: 12px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  color: var(--white);
}
.sw-thumb { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); }
.lk-thumb { background: linear-gradient(135deg, #22c55e, #15803d); }

.case-info h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 6px;
}
.case-info p {
  font-size: 13px;
  color: var(--gray-500);
  margin-bottom: 8px;
  line-height: 1.6;
}

.news-list { margin-bottom: 24px; }

.news-item {
  display: flex;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--gray-200);
}
.news-item:last-child { border-bottom: none; }

.news-date {
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  background: var(--primary);
  color: var(--white);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  text-align: center;
}

.news-body h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 4px;
  line-height: 1.5;
}
.news-body p {
  font-size: 12px;
  color: var(--gray-500);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ===== 关于我们 ===== */
.about-layout {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 60px;
  align-items: start;
}

.about-text .lead {
  font-size: 18px;
  color: var(--gray-700);
  line-height: 1.8;
  margin-bottom: 18px;
  font-weight: 500;
}
.about-text p {
  color: var(--gray-600);
  line-height: 1.8;
  margin-bottom: 14px;
}

.culture-grid {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.culture-item {
  display: flex;
  gap: 16px;
  padding: 18px 22px;
  background: var(--gray-100);
  border-radius: var(--radius);
  align-items: flex-start;
}
.culture-item i {
  font-size: 22px;
  color: var(--primary);
  flex-shrink: 0;
  margin-top: 2px;
}
.culture-item strong {
  display: block;
  font-size: 15px;
  color: var(--gray-900);
  margin-bottom: 4px;
}
.culture-item p {
  font-size: 14px;
  color: var(--gray-600);
  margin: 0;
  line-height: 1.6;
}

.org-card, .cert-card {
  background: var(--gray-100);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 16px;
}

.org-card h3, .cert-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.org-card h3 i, .cert-card h3 i { color: var(--primary); }

.org-tree {
  text-align: center;
}
.org-root {
  display: inline-block;
  background: var(--primary);
  color: var(--white);
  padding: 8px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 16px;
}
.org-branches {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}
.org-branches span {
  background: var(--white);
  border: 1px solid var(--gray-300);
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 13px;
  color: var(--gray-700);
}

.cert-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 12px;
}
.cert-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--gray-700);
}
.cert-item i { color: var(--secondary); }
.cert-note {
  font-size: 12px;
  color: var(--gray-500);
  font-style: italic;
}

.wechat-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background: linear-gradient(135deg, #07c160, #04a74f);
  border-radius: var(--radius);
  padding: 18px 20px;
  color: var(--white);
}
.wechat-card i { font-size: 32px; }
.wechat-card strong { display: block; font-size: 15px; margin-bottom: 2px; }
.wechat-card p { font-size: 13px; opacity: 0.85; margin: 0; }

/* ===== 软件业务 ===== */
.sw-biz-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 56px;
}

.sw-biz-card {
  padding: 32px;
  border-radius: var(--radius);
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  transition: var(--transition);
}
.sw-biz-card:hover {
  background: rgba(255,255,255,0.08);
  transform: translateY(-4px);
}

.sw-biz-icon {
  width: 54px;
  height: 54px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: var(--white);
  margin-bottom: 18px;
}

.sw-biz-card h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 12px;
}

.sw-biz-card p {
  font-size: 14px;
  color: rgba(255,255,255,0.65);
  line-height: 1.8;
}

/* 服务流程 */
.process-section {
  margin-bottom: 48px;
}
.process-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 32px;
  text-align: center;
}

.process-steps {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  flex-wrap: wrap;
}

.step {
  flex: 1;
  min-width: 150px;
  text-align: center;
  padding: 24px 16px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
}

.step-num {
  font-size: 13px;
  font-weight: 700;
  color: rgba(255,255,255,0.3);
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.step-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--white);
  margin: 0 auto 14px;
}

.step h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
}

.step p {
  font-size: 12px;
  color: rgba(255,255,255,0.55);
  line-height: 1.6;
}

.step-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.3);
  font-size: 14px;
  padding-top: 50px;
  flex-shrink: 0;
}

/* 技术优势 */
.tech-adv-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 40px;
}

.tech-adv-item {
  display: flex;
  gap: 14px;
  padding: 20px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  align-items: flex-start;
}
.tech-adv-item i {
  font-size: 22px;
  color: var(--primary-light);
  flex-shrink: 0;
  margin-top: 2px;
}
.tech-adv-item strong {
  display: block;
  color: var(--white);
  font-size: 15px;
  margin-bottom: 4px;
}
.tech-adv-item p {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  margin: 0;
  line-height: 1.6;
}

.video-tip {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(7, 193, 96, 0.1);
  border: 1px solid rgba(7, 193, 96, 0.3);
  border-radius: var(--radius);
  padding: 14px 22px;
  font-size: 14px;
  color: var(--gray-600);
}
.video-tip i { font-size: 20px; color: #07c160; flex-shrink: 0; }
.video-tip.dark { color: rgba(255,255,255,0.7); }
.video-tip strong { color: var(--gray-800); }
.video-tip.dark strong { color: var(--white); }

/* ===== 智能锁 ===== */
.lock-category-tabs {
  display: flex;
  gap: 12px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}

.lock-tab {
  padding: 10px 26px;
  border-radius: 8px;
  border: 2px solid var(--gray-200);
  background: none;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  color: var(--gray-600);
  transition: var(--transition);
}
.lock-tab.active {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--white);
}
.lock-tab:hover:not(.active) {
  border-color: var(--primary);
  color: var(--primary);
}

.lock-content { display: none; }
.lock-content.active { display: block; }

.lock-info-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.lock-desc h3 {
  font-size: 24px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 14px;
}

.lock-desc p {
  color: var(--gray-600);
  line-height: 1.8;
  margin-bottom: 20px;
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}
.feature-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--gray-700);
}
.feature-list li i { color: var(--secondary); flex-shrink: 0; }

.price-note {
  font-size: 14px;
  color: var(--gray-600);
  margin-bottom: 20px;
}
.price-note span {
  color: var(--primary);
  font-weight: 600;
}

.lock-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.lock-card {
  padding: 20px;
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  text-align: center;
  transition: var(--transition);
}
.lock-card:hover {
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: 0 4px 16px rgba(26,108,255,0.1);
}
.lock-card-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, rgba(26,108,255,0.1), rgba(26,108,255,0.2));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--primary);
  margin: 0 auto 12px;
}
.lock-card h4 { font-size: 14px; font-weight: 700; color: var(--gray-900); margin-bottom: 6px; }
.lock-card p { font-size: 12px; color: var(--gray-500); }

.service-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.svc-card {
  padding: 28px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  text-align: center;
  transition: var(--transition);
}
.svc-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: var(--secondary);
}
.svc-icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, #22c55e, #15803d);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--white);
  margin: 0 auto 14px;
}
.svc-card h4 { font-size: 15px; font-weight: 700; color: var(--gray-900); margin-bottom: 8px; }
.svc-card p { font-size: 13px; color: var(--gray-500); line-height: 1.6; }

/* ===== 案例展示 ===== */
.case-filter {
  display: flex;
  gap: 12px;
  margin-bottom: 36px;
}
.filter-btn {
  padding: 8px 22px;
  border-radius: 8px;
  border: 1px solid var(--gray-300);
  background: none;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  color: var(--gray-600);
  transition: var(--transition);
}
.filter-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--white);
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.case-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--gray-200);
  transition: var(--transition);
}
.case-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.case-card.hidden { display: none; }

.case-card-head {
  padding: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 40px;
  color: rgba(255,255,255,0.8);
}
.sw-head { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); }
.lk-head { background: linear-gradient(135deg, #22c55e, #15803d); }

.case-type-tag {
  font-size: 12px;
  background: rgba(255,255,255,0.2);
  padding: 4px 12px;
  border-radius: 12px;
  color: var(--white);
  font-weight: 600;
}

.case-card-body {
  padding: 24px;
}
.case-card-body h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 10px;
}
.case-card-body p {
  font-size: 14px;
  color: var(--gray-600);
  line-height: 1.7;
  margin-bottom: 16px;
}
.case-meta {
  display: flex;
  gap: 16px;
}
.case-meta span {
  font-size: 12px;
  color: var(--gray-500);
  display: flex;
  align-items: center;
  gap: 5px;
}
.case-meta i { color: var(--primary); }

/* ===== 新闻动态 ===== */
.news-tabs {
  display: flex;
  gap: 12px;
  margin-bottom: 36px;
  border-bottom: 2px solid var(--gray-200);
  padding-bottom: 0;
}

.news-tab-btn {
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 600;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--gray-500);
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: var(--transition);
}
.news-tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.news-panel { display: none; }
.news-panel.active { display: block; }

.news-card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.news-card {
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}
.news-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}
.news-card.featured {
  border-color: var(--accent);
  grid-column: 1 / -1;
  flex-direction: row;
}

.news-card-date {
  background: var(--primary);
  color: var(--white);
  padding: 16px;
  font-size: 13px;
  font-weight: 700;
  text-align: center;
  writing-mode: vertical-rl;
  letter-spacing: 2px;
}
.featured-date {
  writing-mode: horizontal-tb;
  padding: 24px 32px;
  background: linear-gradient(135deg, var(--accent), #d97706);
  font-size: 14px;
  min-width: 120px;
}

.news-card-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.news-card-body h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 10px;
  line-height: 1.5;
}
.news-card-body p {
  font-size: 14px;
  color: var(--gray-600);
  line-height: 1.7;
  flex: 1;
  margin-bottom: 16px;
}

/* ===== 联系我们 ===== */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 60px;
  align-items: start;
}

.contact-form-wrap h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
}

.form-desc {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  margin-bottom: 28px;
  line-height: 1.7;
}

.contact-form .form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  margin-bottom: 18px;
}
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: rgba(255,255,255,0.8);
  margin-bottom: 8px;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 8px;
  font-size: 14px;
  color: var(--white);
  outline: none;
  transition: var(--transition);
  font-family: inherit;
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: rgba(255,255,255,0.35); }
.form-group select option { background: var(--dark-2); color: var(--white); }
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary-light);
  background: rgba(255,255,255,0.1);
  box-shadow: 0 0 0 3px rgba(26,108,255,0.2);
}

.contact-info h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 20px;
}

.info-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  padding: 6px 0;
  margin-bottom: 16px;
}

.info-item {
  display: flex;
  gap: 14px;
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.07);
  align-items: flex-start;
}
.info-item:last-child { border-bottom: none; }

.info-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--white);
  flex-shrink: 0;
}

.info-item strong {
  display: block;
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  margin-bottom: 2px;
}
.info-item p {
  font-size: 15px;
  color: var(--white);
  margin: 0;
}
.info-tip {
  font-size: 12px;
  color: rgba(255,255,255,0.4);
}

.wechat-qr-card {
  display: flex;
  gap: 16px;
  background: rgba(7, 193, 96, 0.1);
  border: 1px solid rgba(7, 193, 96, 0.25);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-bottom: 16px;
  align-items: center;
}

.qr-placeholder {
  width: 72px;
  height: 72px;
  background: rgba(255,255,255,0.1);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  flex-shrink: 0;
  font-size: 28px;
  color: #07c160;
}
.qr-placeholder span { font-size: 10px; color: rgba(255,255,255,0.5); }

.qr-info strong {
  display: block;
  font-size: 15px;
  color: var(--white);
  margin-bottom: 4px;
}
.qr-info p {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  line-height: 1.6;
  margin: 0;
}

.tip-box {
  display: flex;
  gap: 10px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius);
  padding: 14px 18px;
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  align-items: flex-start;
  line-height: 1.7;
}
.tip-box i { color: var(--accent); flex-shrink: 0; margin-top: 2px; }

/* ===== 页脚 ===== */
.footer {
  background: var(--gray-900);
  color: rgba(255,255,255,0.7);
  padding-top: 64px;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand .logo { margin-bottom: 16px; }
.footer-brand p {
  font-size: 14px;
  color: rgba(255,255,255,0.5);
  line-height: 1.7;
  margin-bottom: 16px;
}
.footer-wechat {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
}
.footer-wechat i { color: #07c160; font-size: 18px; }
.footer-wechat strong { color: var(--white); }

.footer-links-group h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 16px;
}
.footer-links-group ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-links-group li {
  font-size: 14px;
  color: rgba(255,255,255,0.5);
  display: flex;
  align-items: center;
  gap: 6px;
}
.footer-links-group li i { font-size: 12px; color: rgba(255,255,255,0.3); }
.footer-links-group a {
  transition: var(--transition);
}
.footer-links-group a:hover { color: var(--white); }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
}
.footer-bottom p {
  font-size: 13px;
  color: rgba(255,255,255,0.35);
}
.footer-bottom a:not(.btn) { color: rgba(255,255,255,0.5); }
.footer-bottom a:not(.btn):hover { color: var(--white); }

/* ===== 回到顶部 ===== */
.back-to-top {
  position: fixed;
  right: 32px;
  bottom: 32px;
  width: 46px;
  height: 46px;
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 16px;
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition);
  z-index: 900;
  box-shadow: 0 4px 16px rgba(26,108,255,0.4);
}
.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}
.back-to-top:hover { background: var(--primary-dark); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero-content h1 { font-size: 40px; }
  .hero-visual { display: none; }
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .about-layout { grid-template-columns: 1fr; }
  .about-side { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
  .wechat-card { grid-column: 1 / -1; }
  .contact-layout { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(10, 22, 40, 0.98);
    flex-direction: column;
    padding: 20px 24px;
    gap: 4px;
    transform: translateY(-100vh);
    transition: transform 0.4s ease;
  }
  .nav-links.open { transform: translateY(0); }
  .hamburger { display: flex; }
  .section { padding: 60px 0; }
  .section-header h2 { font-size: 28px; }
  .hero-content h1 { font-size: 32px; }
  .biz-grid { grid-template-columns: 1fr; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .sw-biz-grid { grid-template-columns: 1fr; }
  .process-steps { flex-direction: column; }
  .step-arrow { transform: rotate(90deg); }
  .tech-adv-grid { grid-template-columns: 1fr; }
  .lock-info-layout { grid-template-columns: 1fr; }
  .service-cards { grid-template-columns: repeat(2, 1fr); }
  .cases-grid { grid-template-columns: 1fr; }
  .news-card-grid { grid-template-columns: 1fr; }
  .news-card.featured { flex-direction: column; }
  .featured-date { writing-mode: horizontal-tb; padding: 14px 20px; min-width: auto; }
  .two-col-section { grid-template-columns: 1fr; }
  .contact-form .form-row { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
  .video-notice { font-size: 11px; padding: 8px 14px; }
  .about-side { grid-template-columns: 1fr; }
  .hero-dots { bottom: 60px; }
}

@media (max-width: 480px) {
  .product-grid { grid-template-columns: 1fr; }
  .lock-cards { grid-template-columns: repeat(2, 1fr); }
  .service-cards { grid-template-columns: 1fr; }
  .hero-btns { flex-direction: column; }
  .hero-btns .btn { text-align: center; justify-content: center; }
}

/* ===== 动画 ===== */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 各 Section 背景图 ===== */

/* 核心业务：淡蓝圆点网格 */
.bg-dots::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image: radial-gradient(circle, rgba(26,108,255,0.07) 1.5px, transparent 1.5px);
  background-size: 30px 30px;
}

/* 关于我们：右侧装饰光晕 + 浅纹 */
.bg-about {
  overflow: hidden;
}
.bg-about::before {
  content: '';
  position: absolute;
  width: 700px;
  height: 700px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(26,108,255,0.05) 0%, transparent 70%);
  top: -200px;
  right: -200px;
  pointer-events: none;
  z-index: 0;
}
.bg-about::after {
  content: '';
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(34,197,94,0.04) 0%, transparent 70%);
  bottom: -150px;
  left: -150px;
  pointer-events: none;
  z-index: 0;
}

/* 软件业务：科技感背景图 + 斜线纹理叠加 */
.bg-software {
  position: relative;
  overflow: hidden;
}
.bg-software::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    url('https://images.unsplash.com/photo-1461749280684-dccba630e2f6?w=1600&q=60&auto=format&fit=crop');
  background-size: cover;
  background-position: center;
  opacity: 0.07;
}
.bg-software::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(
      -45deg,
      rgba(255,255,255,0.02) 0px,
      rgba(255,255,255,0.02) 1px,
      transparent 1px,
      transparent 12px
    );
}

/* 智能锁产品：右侧大圆光晕 + 菱形格 */
.bg-locks {
  overflow: hidden;
}
.bg-locks::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(34,197,94,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34,197,94,0.04) 1px, transparent 1px);
  background-size: 40px 40px;
}
.bg-locks::after {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(34,197,94,0.06) 0%, transparent 70%);
  top: -100px;
  right: -150px;
  pointer-events: none;
  z-index: 0;
}

/* 案例展示：背景图片 + 浅色半透明遮罩 */
.bg-cases {
  position: relative;
  overflow: hidden;
}
.bg-cases::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    url('https://images.unsplash.com/photo-1504384308090-c894fdcc538d?w=1600&q=50&auto=format&fit=crop');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  opacity: 0.04;
}

/* 新闻动态：装饰波纹 */
.bg-news::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: radial-gradient(circle at 20% 50%, rgba(26,108,255,0.05) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(245,158,11,0.04) 0%, transparent 40%);
}

/* 联系我们：代码线条背景 */
#contact::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    url('https://images.unsplash.com/photo-1550751827-4bd374c3f58b?w=1600&q=50&auto=format&fit=crop');
  background-size: cover;
  background-position: center;
  opacity: 0.06;
}
#contact::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(
      0deg,
      rgba(255,255,255,0.02) 0px,
      rgba(255,255,255,0.02) 1px,
      transparent 1px,
      transparent 20px
    );
}

/* ===== 数字统计横幅 ===== */
.stats-banner {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  position: relative;
  overflow: hidden;
}
.stats-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(255,255,255,0.08) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}
.stats-inner {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: space-around;
  align-items: center;
  padding: 48px 24px;
  flex-wrap: wrap;
  gap: 24px;
}
.stat-item {
  text-align: center;
  color: var(--white);
  min-width: 140px;
}
.stat-num {
  font-size: 48px;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 8px;
  letter-spacing: -2px;
}
.stat-num span {
  font-size: 28px;
  font-weight: 700;
}
.stat-label {
  font-size: 14px;
  color: rgba(255,255,255,0.75);
  letter-spacing: 1px;
}
.stat-divider {
  width: 1px;
  height: 60px;
  background: rgba(255,255,255,0.2);
}
@media (max-width: 600px) {
  .stat-divider { display: none; }
  .stat-num { font-size: 36px; }
}