/* ===================================================
   迪飞特科技 - 官网全局样式
   File: css/style.css
   =================================================== */

/* --- CSS Variables --- */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #60a5fa;
  --accent: #059669;
  --accent-light: #10b981;
  --accent-dark: #047857;
  --dark: #0f172a;
  --dark-2: #1e293b;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,.1), 0 2px 4px -1px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.1), 0 4px 6px -2px rgba(0,0,0,.05);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,.1), 0 10px 10px -5px rgba(0,0,0,.04);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --transition: all .3s cubic-bezier(.4,0,.2,1);
}

/* --- Base Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, sans-serif;
  color: var(--dark-2);
  background: #fff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* --- Utility Classes --- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
.section { padding: 80px 0; }
.section-title {
  text-align: center;
  margin-bottom: 50px;
}
.section-title h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 12px;
}
.section-title p {
  font-size: 1.05rem;
  color: var(--gray-500);
  max-width: 600px;
  margin: 0 auto;
}
.section-title .title-bar {
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 2px;
  margin: 16px auto 0;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}
.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(37,99,235,.35);
}
.btn-accent {
  background: var(--accent);
  color: #fff;
}
.btn-accent:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(5,150,105,.35);
}
.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline:hover {
  background: var(--primary);
  color: #fff;
}
.btn-white {
  background: #fff;
  color: var(--primary);
}
.btn-white:hover {
  background: var(--gray-100);
  transform: translateY(-2px);
}

/* =============================================
   HEADER / NAV
   ============================================= */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,.98);
  /* backdrop-filter fallback: solid background already set above */
  border-bottom: 1px solid rgba(0,0,0,.06);
  transition: var(--transition);
}
.header.scrolled {
  box-shadow: 0 2px 20px rgba(0,0,0,.08);
}
.header-inner {
  display: flex;
  align-items: center;
  height: 72px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  width: 180px;
}
.logo img { height: 40px; width: auto; object-fit: contain; }
.logo-text {
  font-size: 1.15rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary) 0%, #7c3aed 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}
.nav-menu {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
}
/* flex gap fallback for older WebViews */
.nav-menu a {
  padding: 8px 16px;
  font-size: .9rem;
  font-weight: 500;
  color: var(--gray-600);
  border-radius: 8px;
  transition: var(--transition);
  position: relative;
  margin: 0 2px;
}
.nav-menu a:hover,
.nav-menu a.active {
  color: var(--primary);
  background: rgba(37,99,235,.06);
}
.nav-menu a.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  background: var(--primary);
  border-radius: 2px;
}

/* =============================================
   Header CTA — 右侧电话按钮
   ============================================= */
.header-cta {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  justify-content: flex-end;
  width: 180px;
}
.phone-wrapper {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}
.phone-label {
  font-size: .7rem;
  font-weight: 500;
  color: var(--gray-400);
  letter-spacing: .5px;
  white-space: nowrap;
}
.phone-label i { margin-right: 3px; }
.phone-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary);
  padding: 4px 16px 4px 12px;
  border-radius: 50px;
  background: linear-gradient(135deg, rgba(37,99,235,.08) 0%, rgba(37,99,235,.03) 100%);
  border: 1px solid rgba(37,99,235,.15);
  transition: var(--transition);
  white-space: nowrap;
}
.phone-link:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(37,99,235,.3);
}
.phone-ring {
  animation: phoneRing 2s ease-in-out infinite;
}
@keyframes phoneRing {
  0%, 100% { transform: rotate(0deg); }
  10%, 30% { transform: rotate(15deg); }
  20%, 40% { transform: rotate(-15deg); }
  50% { transform: rotate(0deg); }
}

@media (max-width: 768px) {
  .header-cta { width: auto; margin-right: 8px; }
  .phone-label { display: none; }
  .phone-link {
    font-size: .85rem;
    padding: 6px 12px 6px 10px;
  }
}
@media (max-width: 480px) {
  .phone-link span { display: none; }
  .phone-link {
    width: 38px;
    height: 38px;
    padding: 0;
    justify-content: center;
    border-radius: 50%;
    font-size: 1rem;
  }
  .phone-link i { margin: 0; }
  .header-cta { margin-right: 4px; }
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border-radius: 8px;
  background: var(--gray-100);
  border: none;
  font-size: 1.2rem;
  color: var(--dark-2);
  transition: var(--transition);
  flex-shrink: 0;
}
.menu-toggle:hover { background: var(--gray-200); }

/* =============================================
   HERO BANNER (Swiper)
   ============================================= */
.hero-section {
  padding-top: 72px;
}
.hero-slide {
  height: 100vh;
  min-height: 500px;
  max-height: 800px;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}
.hero-slide::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15,23,42,.85) 0%, rgba(15,23,42,.4) 100%);
  z-index: 1;
}
.hero-slide .bg-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  padding: 0 20px;
}
.hero-content .tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(255,255,255,.15);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 50px;
  color: #fff;
  font-size: .85rem;
  font-weight: 500;
  margin-bottom: 20px;
}
.hero-content h1 {
  font-size: 3.2rem;
  font-weight: 900;
  color: #fff;
  line-height: 1.15;
  margin-bottom: 20px;
}
.hero-content h1 .highlight {
  background: linear-gradient(135deg, #60a5fa, #34d399);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-content p {
  font-size: 1.1rem;
  color: rgba(255,255,255,.8);
  line-height: 1.7;
  margin-bottom: 30px;
  max-width: 540px;
}
.hero-btns {
  display: flex;
  flex-wrap: wrap;
}
.hero-btns .btn {
  margin: 0 6px 6px 0;
}

.hero-section .swiper-pagination-bullet {
  width: 10px;
  height: 10px;
  background: rgba(255,255,255,.5);
  opacity: 1;
}
.hero-section .swiper-pagination-bullet-active {
  background: #fff;
  width: 28px;
  border-radius: 5px;
}
.hero-section .swiper-button-next,
.hero-section .swiper-button-prev {
  color: #fff;
  width: 48px;
  height: 48px;
  background: rgba(255,255,255,.1);
  border-radius: 50%;
  transition: var(--transition);
}
.hero-section .swiper-button-next:hover,
.hero-section .swiper-button-prev:hover {
  background: rgba(255,255,255,.25);
}
.hero-section .swiper-button-next::after,
.hero-section .swiper-button-prev::after {
  font-size: 1.1rem;
}

/* =============================================
   CORE BUSINESS
   ============================================= */
.business-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.business-card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
  cursor: default;
}
.business-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: transparent;
}
.business-card .icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.25rem;
}
.business-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 10px;
}
.business-card p {
  font-size: .9rem;
  color: var(--gray-500);
  line-height: 1.6;
}
.business-card .tag-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 14px;
}
.business-card .tag-list span {
  padding: 3px 10px;
  background: var(--gray-100);
  border-radius: 50px;
  font-size: .78rem;
  color: var(--gray-600);
  margin: 3px;
}

/* Color variants for cards */
.business-card:nth-child(1) .icon-wrap { background: rgba(37,99,235,.15); color: #3b82f6; }
.business-card:nth-child(2) .icon-wrap { background: rgba(5,150,105,.15); color: #10b981; }
.business-card:nth-child(3) .icon-wrap { background: rgba(245,158,11,.15); color: #f59e0b; }
.business-card:nth-child(4) .icon-wrap { background: rgba(99,102,241,.15); color: #6366f1; }
.business-card:nth-child(5) .icon-wrap { 
  background: rgba(37,99,235,.12);
  color: #3b82f6;
  position: relative;
}
.business-card:nth-child(6) .icon-wrap { background: rgba(225,29,72,.15); color: #e11d48; }

/* Highlight AI card */
.business-card.highlight {
  border: 2px solid var(--primary);
  position: relative;
  background: linear-gradient(180deg, #eff6ff 0%, #fff 100%);
}
.business-card.highlight::before {
  content: '★ 重点推荐';
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  padding: 2px 14px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-size: .75rem;
  font-weight: 600;
  border-radius: 50px;
  white-space: nowrap;
}

/* =============================================
   PROCESS FLOW (开发流程)
   ============================================= */
/* Desktop: horizontal step flow */
.process-flow {
  max-width: 900px;
  margin: 0 auto;
}
.process-steps {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  position: relative;
}
.process-step {
  text-align: center;
  flex: 1;
  max-width: 140px;
  position: relative;
  padding: 0 4px;
}
.step-number {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 10px;
  font-weight: 700;
  font-size: .82rem;
  box-shadow: 0 4px 12px rgba(37,99,235,.25);
}
.step-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: rgba(37,99,235,.1);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 10px;
  font-size: 1.3rem;
  transition: var(--transition);
}
.process-step:hover .step-icon {
  background: var(--primary);
  color: #fff;
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(37,99,235,.3);
}
.process-step h4 {
  font-size: .92rem;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 5px;
}
.process-step p {
  font-size: .78rem;
  color: var(--gray-500);
  line-height: 1.5;
  margin: 0 4px;
}
.step-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 30px;
  flex-shrink: 0;
  color: var(--gray-300);
  font-size: 1.1rem;
  min-width: 20px;
}

/* Mobile vertical layout */
.process-flow-mobile {
  display: none;
}
.process-steps-vertical {
  max-width: 400px;
  margin: 0 auto;
}
.process-step-v {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px 16px;
  background: var(--gray-50);
  border-radius: var(--radius);
  border: 1px solid var(--gray-100);
  transition: var(--transition);
}
.process-step-v:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-color: var(--gray-200);
}
.process-step-v .step-number {
  flex-shrink: 0;
  margin: 0;
  width: 32px;
  height: 32px;
  font-size: .75rem;
}
.step-v-content {
  flex: 1;
}
.step-v-content .step-icon {
  width: 18px; height: 18px; border-radius: 6px;
  font-size: .78rem;
  display: inline-flex;
  margin: 0 6px 0 0;
  background: none; color: var(--primary);
}
.step-v-content h4 {
  font-size: .95rem;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 3px;
}
.step-v-content p {
  font-size: .82rem;
  color: var(--gray-500);
  line-height: 1.5;
}
.step-v-arrow {
  text-align: center;
  color: var(--gray-300);
  font-size: .9rem;
  padding: 4px 0;
}

/* =============================================
   WHY US
   ============================================= */
.why-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
  font-size: 1.2rem;
}
.why-card:nth-child(1) .why-icon { background: rgba(37,99,235,.15); color: #3b82f6; }
.why-card:nth-child(2) .why-icon { background: rgba(5,150,105,.15); color: #10b981; }
.why-card:nth-child(3) .why-icon { background: rgba(245,158,11,.15); color: #f59e0b; }
.why-card:nth-child(4) .why-icon { background: rgba(99,102,241,.15); color: #6366f1; }

/* =============================================
   AI 智能体 (重点板块)
   ============================================= */
.ai-featured {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #0f172a 100%);
  position: relative;
  overflow: hidden;
}
.ai-featured::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(37,99,235,.12) 0%, transparent 70%);
  border-radius: 50%;
}
.ai-featured::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(5,150,105,.1) 0%, transparent 70%);
  border-radius: 50%;
}
.ai-featured .container { position: relative; z-index: 1; }
.ai-featured .section-title h2 { color: #fff; }
.ai-featured .section-title p { color: rgba(255,255,255,.6); }
.ai-featured .section-title .title-bar { background: linear-gradient(90deg, #60a5fa, #34d399); }

.ai-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}
.ai-card {
  background: rgba(255,255,255,.05);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: var(--transition);
}
.ai-card:hover {
  background: rgba(255,255,255,.1);
  transform: translateY(-4px);
}
.ai-card .ai-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 16px;
}
.ai-card h4 {
  color: #fff;
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}
.ai-card p {
  color: rgba(255,255,255,.6);
  font-size: .88rem;
  line-height: 1.6;
}
.ai-cta {
  text-align: center;
}
.ai-cta .btn { 
  font-size: 1.05rem; 
  padding: 14px 36px;
}
.ai-cta .btn-outline {
  margin-left: 12px;
}
@media (max-width: 480px) {
  .ai-cta .btn { 
    width: 100%;
    justify-content: center;
    margin-left: 0 !important;
    margin-bottom: 8px;
  }
}

/* =============================================
   SUCCESS CASES
   ============================================= */
.software-filter {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 36px;
}
.software-filter button {
  padding: 8px 20px;
  border-radius: 50px;
  border: 1px solid var(--gray-200);
  background: #fff;
  font-size: .88rem;
  font-weight: 500;
  color: var(--gray-600);
  cursor: pointer;
  transition: var(--transition);
  margin: 4px;
}
.software-filter button:hover,
.software-filter button.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.software-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.software-card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
  cursor: default;
  display: none;
  position: relative;
}
.software-card.show { display: block; }
.software-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--primary), var(--accent));
  border-radius: 4px 0 0 4px;
  opacity: 0;
  transition: var(--transition);
}
.software-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.software-card:hover::before {
  opacity: 1;
}
.software-card .industry-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 50px;
  font-size: .75rem;
  font-weight: 600;
  margin-bottom: 12px;
}
.software-card .industry-tag.汽车 { background: #fef3c7; color: #92400e; }
.software-card .industry-tag.文旅 { background: #dbeafe; color: #1e40af; }
.software-card .industry-tag.数据 { background: #d1fae5; color: #065f46; }
.software-card .industry-tag.物流 { background: #e0e7ff; color: #3730a3; }
.software-card .industry-tag.AI智能 { 
  background: linear-gradient(135deg, #dbeafe, #d1fae5);
  color: #1e40af;
}
.software-card .industry-tag.企业 { background: #fce7f3; color: #9d174d; }

.software-card h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 8px;
  line-height: 1.4;
}
.software-card p {
  font-size: .85rem;
  color: var(--gray-500);
  line-height: 1.6;
  margin-bottom: 12px;
}
.software-card .tech-tag {
  display: inline-block;
  padding: 2px 8px;
  background: var(--gray-100);
  border-radius: 4px;
  font-size: .75rem;
  color: var(--gray-600);
  margin-right: 4px;
  margin-top: 4px;
}
.software-card .icon-badge {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  font-size: 1.3rem;
  background: rgba(37,99,235,.12);
  color: #3b82f6;
}
/* Industry-specific icon bg colors */
.software-card[data-industry="高精专维修"] .icon-badge { background: rgba(245,158,11,.15); color: #f59e0b; }
.software-card[data-industry="文旅非遗"] .icon-badge { background: rgba(37,99,235,.15); color: #3b82f6; }
.software-card[data-industry="数据管理"] .icon-badge { background: rgba(5,150,105,.15); color: #10b981; }
.software-card[data-industry="物流电商"] .icon-badge { background: rgba(99,102,241,.15); color: #6366f1; }
.software-card[data-industry="AI智能"] .icon-badge { background: rgba(139,92,246,.15); color: #8b5cf6; }
.software-card[data-industry="企业办公"] .icon-badge { background: rgba(225,29,72,.15); color: #e11d48; }

/* =============================================
   STATS
   ============================================= */
.stats-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  padding: 60px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}
.stat-item {
  text-align: center;
  color: #fff;
}
.stat-item .num {
  font-size: 2.4rem;
  font-weight: 900;
  margin-bottom: 6px;
}
.stat-item .num .suffix { font-size: 1.2rem; }
.stat-item .label {
  font-size: .9rem;
  opacity: .8;
}

/* =============================================
   PAGE BANNER (内页通用)
   ============================================= */
.page-banner {
  padding-top: 72px;
  position: relative;
  min-height: 360px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.page-banner-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 40%, #1e293b 100%);
}
.page-banner-bg::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(37,99,235,.15) 0%, transparent 70%);
  border-radius: 50%;
}
.page-banner-bg::after {
  content: '';
  position: absolute;
  bottom: -20%;
  left: -5%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(5,150,105,.1) 0%, transparent 70%);
  border-radius: 50%;
}
.page-banner-content {
  position: relative;
  z-index: 1;
  text-align: center;
  width: 100%;
  padding: 60px 20px;
}
.page-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(255,255,255,.12);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 50px;
  color: rgba(255,255,255,.7);
  font-size: .82rem;
  font-weight: 500;
  margin-bottom: 20px;
  letter-spacing: 1px;
}
.page-banner-content h1 {
  font-size: 2.8rem;
  font-weight: 900;
  color: #fff;
  margin-bottom: 14px;
}
.page-banner-content .page-subtitle {
  font-size: 1.1rem;
  color: rgba(255,255,255,.65);
  max-width: 500px;
  margin: 0 auto;
}

/* =============================================
   ABOUT INTRO
   ============================================= */
.about-intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}
.about-intro-text p {
  font-size: .95rem;
  color: var(--gray-600);
  line-height: 1.8;
  margin-bottom: 14px;
}
.about-intro-text p strong {
  color: var(--dark);
  font-weight: 700;
}
.about-contact-row {
  display: flex;
  gap: 12px;
  margin-top: 24px;
  flex-wrap: wrap;
}
.about-img-placeholder {
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #1e3a5f 0%, #0f172a 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,.4);
  border: 1px solid rgba(255,255,255,.08);
}
.about-img-placeholder .placeholder-icon {
  font-size: 3rem;
  margin-bottom: 16px;
  opacity: .6;
}
.about-img-placeholder .placeholder-text {
  font-size: 1rem;
  letter-spacing: 1px;
}

/* =============================================
   TIMELINE (发展历程)
   ============================================= */
.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding: 20px 0;
}
.timeline-line {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--primary), var(--accent), var(--primary));
  transform: translateX(-50%);
  border-radius: 2px;
}
.timeline-item {
  position: relative;
  width: 50%;
  padding: 0 40px 40px;
}
.timeline-item.left {
  left: 0;
  text-align: right;
}
.timeline-item.right {
  left: 50%;
  text-align: left;
}
.timeline-dot {
  position: absolute;
  top: 8px;
  width: 18px;
  height: 18px;
  background: #fff;
  border: 4px solid var(--primary);
  border-radius: 50%;
  z-index: 2;
  box-shadow: 0 0 0 4px rgba(37,99,235,.15);
}
.timeline-item.left .timeline-dot {
  right: -9px;
}
.timeline-item.right .timeline-dot {
  left: -9px;
}
.timeline-card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
  position: relative;
}
.timeline-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.timeline-card::before {
  content: '';
  position: absolute;
  top: 14px;
  width: 0;
  height: 0;
  border-style: solid;
}
.timeline-item.left .timeline-card::before {
  right: -10px;
  border-width: 8px 0 8px 10px;
  border-color: transparent transparent transparent var(--gray-200);
}
.timeline-item.right .timeline-card::before {
  left: -10px;
  border-width: 8px 10px 8px 0;
  border-color: transparent var(--gray-200) transparent transparent;
}
.timeline-year {
  display: inline-block;
  padding: 3px 14px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border-radius: 50px;
  font-size: .82rem;
  font-weight: 700;
  margin-bottom: 10px;
}
.timeline-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 8px;
}
.timeline-card p {
  font-size: .88rem;
  color: var(--gray-500);
  line-height: 1.7;
}

/* =============================================
   CULTURE GRID (企业文化)
   ============================================= */
.culture-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.culture-card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
  transition: var(--transition);
  cursor: default;
}
.culture-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: transparent;
}
.culture-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 18px;
  font-size: 1.5rem;
}
.culture-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 12px;
}
.culture-card p {
  font-size: .9rem;
  color: var(--gray-500);
  line-height: 1.7;
}

/* =============================================
   FOOTER
   ============================================= */
.footer {
  background: var(--dark);
  color: #fff;
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.footer-brand .logo { color: #fff; margin-bottom: 16px; }
.footer-brand .logo img { height: 44px; width: auto; object-fit: contain; }
.footer-brand p {
  font-size: .88rem;
  color: rgba(255,255,255,.5);
  line-height: 1.7;
  margin-bottom: 16px;
}
.footer-socials {
  display: flex;
  gap: 10px;
}
.footer-socials a {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: rgba(255,255,255,.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,.6);
  font-size: .9rem;
  transition: var(--transition);
}
.footer-socials a:hover {
  background: var(--primary);
  color: #fff;
}
.footer h4 {
  font-size: .95rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: #fff;
}
.footer-links a {
  display: block;
  padding: 5px 0;
  font-size: .85rem;
  color: rgba(255,255,255,.5);
  transition: var(--transition);
}
.footer-links a:hover { color: var(--primary-light); padding-left: 4px; }
.footer-contact p {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: .85rem;
  color: rgba(255,255,255,.5);
  margin-bottom: 10px;
}
.footer-contact p i {
  color: var(--primary-light);
  margin-top: 3px;
  width: 16px;
}
.qr-codes {
  display: flex;
  gap: 16px;
  margin-top: 16px;
}
.qr-item {
  text-align: center;
}
.qr-item img {
  width: 90px;
  height: 90px;
  border-radius: 8px;
  background: #fff;
  padding: 4px;
}
.qr-item span {
  display: block;
  font-size: .75rem;
  color: rgba(255,255,255,.4);
  margin-top: 6px;
}
.footer-bottom {
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: .82rem;
  color: rgba(255,255,255,.35);
}

/* =============================================
   RESPONSIVE - 移动端优先适配
   ============================================= */
@media (max-width: 1024px) {
  .business-grid { grid-template-columns: repeat(2, 1fr); }
  .software-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 30px; }
  .hero-content h1 { font-size: 2.6rem; }
  .about-intro-grid { grid-template-columns: 1fr; gap: 30px; }
  .about-intro-img { order: -1; }
  .culture-grid { grid-template-columns: repeat(2, 1fr); }
  .page-banner-content h1 { font-size: 2.2rem; }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
    margin-left: auto;
  }
  .nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    z-index: 1001;
    background: rgba(255,255,255,.98);
    flex-direction: column;
    padding: 16px 20px;
    border-bottom: 1px solid var(--gray-200);
    transform: translateY(-120%);
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
    /* 固定定位覆盖层，不占flex空间 */
    flex: 0 0 0;
    width: 0;
    overflow: hidden;
  }
  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
    width: 100%;
    overflow: visible;
  }
  .nav-menu a {
    width: 100%;
    padding: 12px 16px;
  }

  .section { padding: 60px 0; }
  .section-title h2 { font-size: 1.6rem; }

  .hero-slide { min-height: 460px; max-height: 580px; }
  .hero-content h1 { font-size: 2rem; }
  .hero-content p { font-size: .95rem; }

  .business-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .business-card { padding: 24px 16px; }
  .business-card .icon-wrap { width: 40px; height: 40px; font-size: 1.05rem; margin-bottom: 12px; }
  .business-card h3 { font-size: .95rem; }
  .business-card p { font-size: .8rem; }

  .ai-grid { grid-template-columns: 1fr; }
  .ai-card { padding: 20px; }
  .ai-card .ai-icon { width: 40px; height: 40px; font-size: 1.1rem; }

  .software-grid { grid-template-columns: 1fr; }
  .software-filter button { font-size: .8rem; padding: 6px 14px; margin: 3px; }

  /* Mobile: hide horizontal, show vertical */
  .process-flow { display: none; }
  .process-flow-mobile { display: block; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .stat-item .num { font-size: 1.8rem; }

  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .qr-codes { justify-content: center; }

  /* Inner pages responsive */
  .page-banner { min-height: 260px; }
  .page-banner-content h1 { font-size: 1.8rem; }
  .page-banner-content .page-subtitle { font-size: .95rem; }
  .culture-grid { grid-template-columns: 1fr; gap: 16px; }
  .culture-card { padding: 28px 20px; }

  /* Timeline on mobile — left aligned single column */
  .timeline-line { left: 20px; }
  .timeline-item,
  .timeline-item.left,
  .timeline-item.right {
    width: 100%;
    left: 0;
    padding: 0 0 30px 52px;
    text-align: left;
  }
  .timeline-item.left .timeline-dot,
  .timeline-item.right .timeline-dot {
    left: 11px;
    right: auto;
  }
  .timeline-item.left .timeline-card::before,
  .timeline-item.right .timeline-card::before {
    left: -10px;
    right: auto;
    border-width: 8px 10px 8px 0;
    border-color: transparent var(--gray-200) transparent transparent;
  }

  /* About page */
  .about-intro-grid { grid-template-columns: 1fr; gap: 24px; }
}

@media (max-width: 480px) {
  .business-grid { grid-template-columns: 1fr; }
  .hero-content h1 { font-size: 1.6rem; line-height: 1.2; }
  .hero-btns .btn { width: 100%; justify-content: center; }
  .stat-item .num { font-size: 1.5rem; }
  .page-banner-content h1 { font-size: 1.4rem; }
  .page-banner { min-height: 220px; }
  .page-banner-content { padding: 36px 20px; }
  .culture-card { padding: 24px 16px; }
  .section { padding: 40px 0; }
  .section-title { margin-bottom: 30px; }
  .section-title h2 { font-size: 1.35rem; }
  .section-title p { font-size: .88rem; }
  .container { padding: 0 16px; }

  .header-inner { height: 60px; }
  .nav-menu { top: 60px; }
  .logo img { height: 32px; }
  .hero-section { padding-top: 60px; }

  .software-card { padding: 18px; }
  .software-card h4 { font-size: .9rem; }
  .software-card p { font-size: .8rem; }
  
  .stats-section { padding: 40px 0; }
  .stat-item .num { font-size: 1.3rem; }
  
  .ai-card { padding: 16px; }
  .ai-card h4 { font-size: .92rem; }
  .ai-card p { font-size: .82rem; }

  .footer { padding: 40px 0 0; }
  .footer-grid { gap: 20px; }
  .qr-item img { width: 72px; height: 72px; }
}

/* ===================================================
   AI知识点 · 术语库
   =================================================== */
.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  max-width: 1000px;
  margin: 0 auto;
}
.knowledge-card {
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: 14px;
  padding: 24px 22px;
  transition: all .35s ease;
  cursor: pointer;
  text-decoration: none;
  display: block;
  position: relative;
  overflow: hidden;
}
.knowledge-card:hover {
  transform: translateY(-4px);
  border-color: rgba(129,140,248,.35);
  box-shadow: 0 8px 30px rgba(0,0,0,.3);
}
.knowledge-card::after {
  content: '\f054';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: rgba(129,140,248,.2);
  font-size: 1rem;
  transition: all .3s ease;
}
.knowledge-card:hover::after {
  color: rgba(129,140,248,.6);
  right: 14px;
}
.knowledge-card .kc-top {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 10px;
}
.knowledge-card .kc-num {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: rgba(99,102,241,.15);
  color: #818cf8;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .78rem;
  font-weight: 700;
  flex-shrink: 0;
}
.knowledge-card .kc-cat {
  font-size: .72rem;
  padding: 3px 12px;
  border-radius: 50px;
  background: rgba(255,255,255,.05);
  color: rgba(255,255,255,.4);
  white-space: nowrap;
}
.knowledge-card h3 {
  color: #e2e8f0;
  font-size: .95rem;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
  padding-right: 28px;
}
.knowledge-card p {
  color: rgba(255,255,255,.5);
  font-size: .82rem;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.knowledge-card .kc-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 10px;
}
.knowledge-card .kc-tags span {
  font-size: .7rem;
  padding: 2px 10px;
  border-radius: 50px;
  background: rgba(99,102,241,.08);
  color: rgba(129,140,248,.6);
}
.knowledge-more {
  text-align: center;
  margin-top: 36px;
}
.knowledge-more .btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 36px;
  font-size: .95rem;
  border-radius: 10px;
  background: transparent;
  color: rgba(255,255,255,.7);
  border: 1.5px solid rgba(255,255,255,.15);
  transition: all .3s ease;
  cursor: pointer;
  text-decoration: none;
}
.knowledge-more .btn:hover {
  border-color: rgba(129,140,248,.4);
  color: #fff;
  background: rgba(99,102,241,.08);
}

/* Knowledge grid responsive */
@media (max-width:768px) {
  .knowledge-grid { grid-template-columns: 1fr; }
  .knowledge-card { padding: 18px 16px; }
  .knowledge-card h3 { font-size: .88rem; }
  .knowledge-card p { font-size: .8rem; }
}

/* ===================================================
   WeChat X5 / Mobile Browser Fixes
   =================================================== */
/* Fix: backdrop-filter not rendering solid background on X5 kernel */
@media (max-width: 768px) {
  .hero-content .tag { background: rgba(0,0,0,.35); }
  .page-tag { background: rgba(0,0,0,.35); }
  .ai-card { background: rgba(255,255,255,.08); }
}

/* Fix: iOS Safari 100vh issue (bottom toolbar) */
@supports (-webkit-touch-callout: none) {
  .hero-slide {
    height: -webkit-fill-available;
    min-height: 460px;
  }
}

/* Fix: WeChat image display */
img {
  -webkit-touch-callout: none;
}