/* ========================================
   慧创景鸿 · 官方网站
   苏州慧创景鸿系统集成有限公司
   ======================================== */

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

:root {
  --color-primary: #1B3A5C;
  --color-primary-light: #2C5F8A;
  --color-primary-dark: #12283F;
  --color-accent: #C4922E;
  --color-accent-hover: #A87B25;
  --color-bg: #FAFAFA;
  --color-bg-section: #F2F4F6;
  --color-text: #2D2D2D;
  --color-text-light: #666;
  --color-text-lighter: #999;
  --color-border: #E5E5E5;
  --color-white: #FFFFFF;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  --max-width: 1200px;
  --nav-height: 68px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s;
}

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

img {
  max-width: 100%;
  height: auto;
}

ul {
  list-style: none;
}

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

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: box-shadow 0.3s;
}

.nav.scrolled {
  box-shadow: 0 1px 8px rgba(0,0,0,0.06);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: 0.5px;
}

.nav-logo .logo-img {
  height: 36px;
  max-height: 36px;
  width: auto;
  max-width: none;
  display: block;
  object-fit: contain;
  flex-shrink: 0;
}

.nav-logo .logo-text {
  white-space: nowrap;
  font-size: 18px;
  font-weight: 600;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-links a {
  font-size: 15px;
  color: var(--color-text);
  position: relative;
  padding: 4px 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width 0.25s;
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-links a.active {
  color: var(--color-primary);
  font-weight: 500;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  font-size: 14px;
  font-weight: 500;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  font-family: var(--font-sans);
  letter-spacing: 0.3px;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-primary-light);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}

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

.btn-accent {
  background: var(--color-accent);
  color: var(--color-white);
}

.btn-accent:hover {
  background: var(--color-accent-hover);
}

.btn-lg {
  padding: 14px 32px;
  font-size: 16px;
}

.btn-sm {
  padding: 6px 16px;
  font-size: 13px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: all 0.3s;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  padding: 140px 0 80px;
  background: linear-gradient(180deg, #F0F4F8 0%, var(--color-white) 100%);
}

.hero .container {
  display: flex;
  align-items: center;
  gap: 60px;
}

.hero-content {
  flex: 1;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(27, 58, 92, 0.08);
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 500;
  border-radius: 20px;
  margin-bottom: 24px;
  letter-spacing: 0.5px;
}

.hero h1 {
  font-size: 40px;
  font-weight: 700;
  color: var(--color-primary-dark);
  line-height: 1.3;
  margin-bottom: 20px;
  letter-spacing: 0;
  white-space: nowrap;
}

.hero-desc {
  font-size: 17px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 36px;
  max-width: 520px;
}

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

.hero-stats {
  display: flex;
  gap: 48px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.hero-stat h3 {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
}

.hero-stat p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-top: 4px;
}

.hero-visual {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-card {
  background: var(--color-white);
  border-radius: 12px;
  padding: 40px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.06);
  border: 1px solid var(--color-border);
  max-width: 420px;
}

.hero-card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.hero-card ul {
  list-style: none;
}

.hero-card ul li {
  padding: 10px 0;
  font-size: 15px;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 10px;
}

.hero-card ul li:last-child {
  border-bottom: none;
}

.hero-card ul li::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  flex-shrink: 0;
}

/* ============================================
   Sections
   ============================================ */
.section {
  padding: 80px 0;
}

.section-grey {
  background: var(--color-bg-section);
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}

.section-desc {
  font-size: 16px;
  color: var(--color-text-light);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ============================================
   Business Cards
   ============================================ */
.business-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.business-card {
  background: var(--color-white);
  border-radius: 10px;
  padding: 36px 32px;
  border: 1px solid var(--color-border);
  transition: box-shadow 0.3s, transform 0.3s;
}

.business-card:hover {
  box-shadow: 0 8px 32px rgba(0,0,0,0.08);
  transform: translateY(-2px);
}

.business-card-icon {
  width: 48px;
  height: 48px;
  background: rgba(27, 58, 92, 0.06);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 22px;
}

.business-card h3 {
  font-size: 19px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 12px;
}

.business-card p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.75;
  margin-bottom: 16px;
}

.business-card .card-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.business-card .card-link:hover {
  gap: 10px;
}

/* ============================================
   Company Card (认证信息)
   ============================================ */
.company-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.04);
}

.company-card h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 24px;
  grid-column: 1 / -1;
}

.info-grid {
  display: grid;
  gap: 16px;
}

.info-item {
  display: flex;
  gap: 12px;
}

.info-label {
  font-size: 14px;
  color: var(--color-text-lighter);
  min-width: 80px;
  flex-shrink: 0;
}

.info-value {
  font-size: 15px;
  color: var(--color-text);
}

.cert-images {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.cert-thumb {
  width: 140px;
  height: 100px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  object-fit: cover;
  cursor: pointer;
  transition: transform 0.2s;
}

.cert-thumb:hover {
  transform: scale(1.05);
}

/* ============================================
   Process Steps
   ============================================ */
.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  position: relative;
}

.process-steps::before {
  content: '';
  position: absolute;
  top: 28px;
  left: 12%;
  right: 12%;
  height: 2px;
  background: var(--color-border);
  z-index: 0;
}

.process-step {
  text-align: center;
  position: relative;
  z-index: 1;
}

.step-number {
  width: 56px;
  height: 56px;
  background: var(--color-white);
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 700;
  margin: 0 auto 20px;
}

.process-step h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
}

.process-step p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.65;
}

/* ============================================
   Features / Highlights
   ============================================ */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-item {
  padding: 32px;
  background: var(--color-white);
  border-radius: 10px;
  border: 1px solid var(--color-border);
}

.feature-item h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 12px;
}

.feature-item p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.75;
}

/* ============================================
   Case Studies
   ============================================ */
.case-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.case-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  overflow: hidden;
  transition: box-shadow 0.3s;
}

.case-card:hover {
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.case-image {
  height: 200px;
  background: var(--color-bg-section);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-lighter);
  font-size: 14px;
}

.case-body {
  padding: 24px;
}

.case-tag {
  display: inline-block;
  padding: 3px 12px;
  background: rgba(27, 58, 92, 0.07);
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 500;
  border-radius: 4px;
  margin-bottom: 12px;
}

.case-body h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
}

.case-body p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ============================================
   Contact Section
   ============================================ */
.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
  align-items: start;
}

.contact-info h2 {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 16px;
}

.contact-info > p {
  color: var(--color-text-light);
  margin-bottom: 32px;
  line-height: 1.8;
}

.contact-detail {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
  align-items: flex-start;
}

.contact-detail .icon-dot {
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
  margin-top: 8px;
  flex-shrink: 0;
}

.contact-detail strong {
  display: block;
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 2px;
}

.contact-detail span {
  font-size: 15px;
  color: var(--color-text-light);
}

.contact-form {
  background: var(--color-white);
  padding: 36px;
  border: 1px solid var(--color-border);
  border-radius: 12px;
}

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

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

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  font-size: 15px;
  border: 1.5px solid var(--color-border);
  border-radius: 8px;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-white);
  transition: border-color 0.2s;
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--color-primary);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 20px;
}

.footer-col a {
  display: block;
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  padding: 6px 0;
  transition: color 0.2s;
}

.footer-col a:hover {
  color: var(--color-white);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: rgba(255,255,255,0.5);
}

.footer-bottom a {
  color: rgba(255,255,255,0.5);
}

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

/* ============================================
   Page Headers (sub pages)
   ============================================ */
.page-header {
  padding: 120px 0 56px;
  background: linear-gradient(180deg, #F0F4F8 0%, var(--color-white) 100%);
  text-align: center;
}

.page-header h1 {
  font-size: 36px;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 12px;
}

.page-header p {
  font-size: 16px;
  color: var(--color-text-light);
  max-width: 560px;
  margin: 0 auto;
}

/* ============================================
   Content pages
   ============================================ */
.content-section {
  padding: 48px 0 80px;
}

.content-section h2 {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 20px;
  margin-top: 48px;
}

.content-section h2:first-child {
  margin-top: 0;
}

.content-section p {
  font-size: 16px;
  color: var(--color-text-light);
  line-height: 1.9;
  margin-bottom: 20px;
}

.content-section .content-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin: 32px 0;
}

.content-section .content-item {
  padding: 24px;
  background: var(--color-bg-section);
  border-radius: 8px;
  border-left: 3px solid var(--color-primary);
}

.content-item h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary-dark);
  margin-bottom: 8px;
}

.content-item p {
  font-size: 14px;
  margin-bottom: 0;
}

/* ============================================
   Back to top
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.3s;
  z-index: 999;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   Mobile Nav Overlay
   ============================================ */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-white);
    flex-direction: column;
    align-items: flex-start;
    padding: 32px 24px;
    gap: 24px;
    transform: translateX(100%);
    transition: transform 0.3s;
    z-index: 999;
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    padding: 100px 0 48px;
  }

  .hero .container {
    flex-direction: column;
    gap: 40px;
  }

  .hero h1 {
    font-size: 32px;
  }

  .hero h1 {
    font-size: 28px;
  }

  .hero-stats {
    gap: 32px;
  }

  .business-grid {
    grid-template-columns: 1fr;
  }

  .process-steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .process-steps::before {
    display: none;
  }

  .features {
    grid-template-columns: 1fr;
  }

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

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .case-grid {
    grid-template-columns: 1fr;
  }

  .company-card {
    grid-template-columns: 1fr;
  }

  .content-section .content-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero-stats {
    flex-direction: column;
    gap: 20px;
  }

  .process-steps {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

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

  .page-header h1 {
    font-size: 28px;
  }
}