/* ============================================
   Intel CPA - 惠州锐思数智 科技咨询公司网站样式
   ============================================ */

/* CSS Reset & Base */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Primary Colors */
  --primary: #2563EB;
  --primary-dark: #1D4ED8;
  --primary-light: #3B82F6;
  --primary-alpha: rgba(37, 99, 235, 0.1);

  /* Accent Colors */
  --accent-green: #059669;
  --accent-purple: #7C3AED;
  --accent-orange: #EA580C;

  /* Neutral */
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-400: #9CA3AF;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --gray-900: #111827;

  /* Typography */
  --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Spacing */
  --container-width: 1200px;
  --section-padding: 100px 0;

  /* Effects */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  color: var(--gray-700);
  line-height: 1.6;
  background: #fff;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

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

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

/* ============================================
   Navigation
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--gray-100);
  transition: all 0.3s ease;
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon svg {
  width: 40px;
  height: 40px;
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--gray-900);
  letter-spacing: 0.5px;
}

.logo-sub {
  font-size: 12px;
  color: var(--gray-500);
  letter-spacing: 2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  color: var(--gray-600);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
  background: var(--primary-alpha);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  gap: 5px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--gray-700);
  border-radius: 2px;
  transition: all 0.3s ease;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
  background: linear-gradient(135deg, #F8FAFC 0%, #EFF6FF 50%, #F0FDF4 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--gray-200) 1px, transparent 1px),
    linear-gradient(90deg, var(--gray-200) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.5;
  transform: perspective(500px) rotateX(60deg);
  transform-origin: center top;
  top: 0;
}

.hero-glow {
  position: absolute;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--primary-alpha) 0%, transparent 70%);
  top: -200px;
  right: -200px;
  opacity: 0.6;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: 50px;
  font-size: 14px;
  color: var(--gray-600);
  margin-bottom: 32px;
  box-shadow: var(--shadow-sm);
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: var(--primary);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.2); }
}

.hero-title {
  font-size: clamp(36px, 6vw, 60px);
  font-weight: 700;
  color: var(--gray-900);
  line-height: 1.2;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.hero-desc {
  font-size: 18px;
  color: var(--gray-500);
  line-height: 1.8;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 60px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

.btn-outline {
  background: white;
  color: var(--gray-700);
  border: 1px solid var(--gray-300);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-full {
  width: 100%;
}

.hero-stats {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  padding: 32px 48px;
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stat-number {
  font-size: 36px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
}

.stat-label {
  font-size: 14px;
  color: var(--gray-500);
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--gray-200);
}

/* ============================================
   Section Common
   ============================================ */
.section {
  padding: var(--section-padding);
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 60px;
}

.section-tag {
  display: inline-block;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--primary);
  background: var(--primary-alpha);
  border-radius: 50px;
  margin-bottom: 16px;
  letter-spacing: 1px;
}

.section-title {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.section-desc {
  font-size: 16px;
  color: var(--gray-500);
  line-height: 1.7;
}

/* ============================================
   About Section
   ============================================ */
.about {
  background: white;
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.about-card {
  padding: 32px;
  background: var(--gray-50);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius-lg);
  transition: all 0.3s ease;
}

.about-card:hover {
  border-color: var(--primary-alpha);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.about-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-alpha);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  color: var(--primary);
}

.about-icon svg {
  width: 28px;
  height: 28px;
}

.about-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 12px;
}

.about-card p {
  font-size: 15px;
  color: var(--gray-500);
  line-height: 1.7;
}

/* ============================================
   Services Section
   ============================================ */
.services {
  background: linear-gradient(180deg, var(--gray-50) 0%, #fff 100%);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}

.service-card {
  padding: 32px;
  background: white;
  border: 1px solid var(--gray-100);
  border-radius: var(--radius-lg);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.service-card:hover {
  border-color: var(--primary-alpha);
  box-shadow: var(--shadow-lg);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-number {
  font-size: 48px;
  font-weight: 700;
  color: var(--gray-100);
  line-height: 1;
  margin-bottom: 16px;
}

.service-card h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 12px;
}

.service-card > p {
  font-size: 15px;
  color: var(--gray-500);
  line-height: 1.7;
  margin-bottom: 20px;
}

.service-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.service-list li {
  font-size: 14px;
  color: var(--gray-600);
}

/* ============================================
   Products Section
   ============================================ */
.products {
  background: white;
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.product-card {
  padding: 32px;
  background: var(--gray-50);
  border: 1px solid var(--gray-100);
  border-radius: var(--radius-lg);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  position: relative;
}

.product-card:hover {
  border-color: var(--primary-alpha);
  box-shadow: var(--shadow-lg);
}

.product-featured {
  background: linear-gradient(135deg, #EFF6FF 0%, #F0FDF4 100%);
  border-color: var(--primary);
}

.product-badge {
  position: absolute;
  top: 24px;
  right: 24px;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 500;
  color: white;
  background: var(--primary);
  border-radius: 50px;
}

.product-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.product-icon svg {
  width: 48px;
  height: 48px;
}

.product-card h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 12px;
}

.product-card > p {
  font-size: 15px;
  color: var(--gray-500);
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
}

.product-features {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.feature-tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--primary);
  background: var(--primary-alpha);
  border-radius: 50px;
}

.feature-tag.green {
  color: var(--accent-green);
  background: rgba(5, 150, 105, 0.1);
}

.feature-tag.purple {
  color: var(--accent-purple);
  background: rgba(124, 58, 237, 0.1);
}

/* ============================================
   Contact Section
   ============================================ */
.contact {
  background: linear-gradient(180deg, var(--gray-50) 0%, #fff 100%);
}

.contact-wrapper {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 48px;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px 24px;
  background: white;
  border: 1px solid var(--gray-100);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
}

.contact-item:hover {
  border-color: var(--primary-alpha);
  box-shadow: var(--shadow-md);
}

.contact-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-alpha);
  border-radius: var(--radius-sm);
  color: var(--primary);
  flex-shrink: 0;
}

.contact-icon svg {
  width: 20px;
  height: 20px;
}

.contact-item > div {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.contact-label {
  font-size: 13px;
  color: var(--gray-400);
}

.contact-value {
  font-size: 15px;
  color: var(--gray-700);
  font-weight: 500;
}

.contact-form-wrapper {
  background: white;
  border: 1px solid var(--gray-100);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-md);
}

.contact-form h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 24px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-700);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: 15px;
  color: var(--gray-700);
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  background: white;
  box-shadow: 0 0 0 3px var(--primary-alpha);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--gray-400);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--gray-900);
  color: var(--gray-400);
  padding: 60px 0 0;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--gray-800);
}

.footer-brand .logo {
  margin-bottom: 16px;
}

.footer-brand .logo-name {
  color: white;
}

.footer-brand .logo-sub {
  color: var(--gray-500);
}

.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  max-width: 300px;
}

.footer-links {
  display: contents;
}

.footer-column h4 {
  font-size: 14px;
  font-weight: 600;
  color: white;
  margin-bottom: 20px;
}

.footer-column ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-column a,
.footer-column span {
  font-size: 14px;
  transition: color 0.2s ease;
}

.footer-column a:hover {
  color: var(--primary-light);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 0;
  font-size: 13px;
}

.footer-bottom a {
  color: var(--gray-500);
}

.footer-bottom a:hover {
  color: var(--primary-light);
}

/* ============================================
   Form Success/Error
   ============================================ */
.form-success {
  padding: 16px;
  background: rgba(5, 150, 105, 0.1);
  border: 1px solid var(--accent-green);
  border-radius: var(--radius-sm);
  color: var(--accent-green);
  text-align: center;
  margin-top: 16px;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 60px 0;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--gray-100);
    box-shadow: var(--shadow-lg);
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links a {
    width: 100%;
    text-align: center;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero {
    padding: 100px 0 60px;
  }

  .hero-title {
    font-size: 32px;
  }

  .hero-desc {
    font-size: 16px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-stats {
    flex-direction: column;
    gap: 20px;
    padding: 24px;
  }

  .stat-divider {
    width: 60px;
    height: 1px;
  }

  .services-grid,
  .products-grid {
    grid-template-columns: 1fr;
  }

  .contact-wrapper {
    grid-template-columns: 1fr;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .section-title {
    font-size: 26px;
  }

  .about-card,
  .service-card,
  .product-card,
  .contact-form-wrapper {
    padding: 24px;
  }

  .btn {
    width: 100%;
  }
}