/* 上海智宇未来智能科技有限公司 - 官网样式 */
:root {
  --primary: #0d4f8b;
  --primary-dark: #083a66;
  --accent: #00a896;
  --accent-light: #02c39a;
  --dark: #1a2332;
  --gray-900: #2d3748;
  --gray-700: #4a5568;
  --gray-500: #718096;
  --gray-300: #cbd5e0;
  --gray-100: #f7fafc;
  --white: #ffffff;
  --shadow: 0 4px 24px rgba(13, 79, 139, 0.12);
  --radius: 8px;
  --radius-lg: 16px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Noto Sans SC", -apple-system, sans-serif;
  color: var(--gray-900);
  line-height: 1.7;
}

a {
  color: inherit;
  text-decoration: none;
  transition: 0.3s;
}

ul {
  list-style: none;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.header {
  background: var(--white);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  position: sticky;
  top: 0;
  z-index: 1000;
}

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

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

.logo-img {
  height: 56px;
  width: auto;
  display: block;
}

.logo-img-footer {
  height: 48px;
  filter: brightness(0) invert(1) drop-shadow(0 0 2px rgba(255, 255, 255, 0.3));
}

.nav {
  display: flex;
  gap: 4px;
}

.nav a {
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--gray-700);
  border-radius: var(--radius);
}

.nav a:hover,
.nav a.active {
  color: var(--primary);
  background: rgba(13, 79, 139, 0.08);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--gray-900);
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: 0.3s;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

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

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.15);
}

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

.btn-sm {
  padding: 10px 20px;
  font-size: 14px;
}

.hero {
  position: relative;
  min-height: 560px;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary), #0a5c7a);
}

.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 80%, rgba(0, 168, 150, 0.3), transparent 50%);
}

.hero-content {
  position: relative;
  z-index: 1;
  color: var(--white);
  padding: 80px 24px;
}

.hero-tag {
  display: inline-block;
  background: rgba(0, 168, 150, 0.3);
  border: 1px solid rgba(0, 168, 150, 0.5);
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 13px;
  margin-bottom: 20px;
  letter-spacing: 2px;
}

.hero h1 {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 20px;
}

.hero-desc {
  font-size: 17px;
  opacity: 0.9;
  max-width: 640px;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  max-width: 640px;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.stat strong {
  display: block;
  font-size: 28px;
  color: var(--accent-light);
}

.stat span {
  font-size: 13px;
  opacity: 0.8;
}

.section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header h2 {
  font-size: 32px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 12px;
}

.section-header p {
  font-size: 16px;
  color: var(--gray-500);
  max-width: 560px;
  margin: 0 auto;
}

.section-header.light h2 {
  color: var(--white);
}

.section-header.light p {
  color: rgba(255, 255, 255, 0.75);
}

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

.product-card {
  background: var(--white);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: 0.3s;
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  border-color: var(--primary);
  box-shadow: 0 12px 48px rgba(13, 79, 139, 0.18);
  transform: translateY(-4px);
}

.product-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 20px;
}

.product-icon.mining {
  background: #fef3c7;
}

.product-icon.food {
  background: #dcfce7;
}

.product-icon.ultrasonic {
  background: #dbeafe;
}

.product-icon.sensor {
  background: #f3e8ff;
}

.product-card h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
}

.product-card p {
  font-size: 14px;
  color: var(--gray-500);
  flex: 1;
  margin-bottom: 16px;
}

.card-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
}

.advantages {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: var(--white);
}

.advantage-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.advantage-item {
  padding: 24px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.advantage-num {
  font-size: 36px;
  font-weight: 700;
  color: var(--accent-light);
  opacity: 0.6;
  margin-bottom: 12px;
}

.advantage-item h4 {
  font-size: 18px;
  margin-bottom: 10px;
}

.advantage-item p {
  font-size: 14px;
  opacity: 0.85;
}

.app-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.app-tab {
  padding: 10px 24px;
  border: 2px solid var(--gray-300);
  background: var(--white);
  border-radius: 24px;
  font-size: 14px;
  cursor: pointer;
  font-family: inherit;
}

.app-tab.active {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--white);
}

.app-panel {
  display: none;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  background: var(--gray-100);
  border-radius: var(--radius-lg);
  padding: 48px;
}

.app-panel.active {
  display: grid;
}

.app-content h3 {
  font-size: 24px;
  margin-bottom: 20px;
}

.app-content li {
  padding: 8px 0 8px 24px;
  position: relative;
  color: var(--gray-700);
}

.app-content li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

.app-visual {
  height: 280px;
  border-radius: var(--radius-lg);
}

.mining-visual {
  background: linear-gradient(135deg, #78350f, #92400e);
}

.food-visual {
  background: linear-gradient(135deg, #166534, #15803d);
}

.chem-visual {
  background: linear-gradient(135deg, #1e3a5f, #2563eb);
}

.auto-visual {
  background: linear-gradient(135deg, #4c1d95, #7c3aed);
}

.cta {
  background: var(--accent);
  padding: 64px 0;
}

.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.cta h2 {
  font-size: 28px;
  color: var(--white);
  margin-bottom: 8px;
}

.cta p {
  color: rgba(255, 255, 255, 0.9);
}

.footer {
  background: var(--dark);
  color: rgba(255, 255, 255, 0.75);
  padding-top: 64px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
}

.footer-brand p {
  margin-top: 16px;
  font-size: 14px;
}

.footer-links h4 {
  color: var(--white);
  font-size: 16px;
  margin-bottom: 16px;
}

.footer-links a {
  display: block;
  font-size: 14px;
  padding: 6px 0;
}

.footer-links a:hover {
  color: var(--accent-light);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px 0;
  text-align: 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(--accent-light);
}

.page-hero {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  color: var(--white);
  padding: 64px 0;
  text-align: center;
}

.page-hero h1 {
  font-size: 36px;
  margin-bottom: 12px;
}

.breadcrumb {
  display: flex;
  gap: 8px;
  justify-content: center;
  font-size: 14px;
  margin-bottom: 16px;
  opacity: 0.8;
}

.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.about-intro h2 {
  font-size: 28px;
  margin-bottom: 20px;
}

.about-intro p {
  color: var(--gray-700);
  margin-bottom: 16px;
  font-size: 15px;
}

.about-image {
  height: 360px;
  background: linear-gradient(135deg, #1a6bb5, var(--accent));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 64px;
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.value-card {
  text-align: center;
  padding: 32px 24px;
  background: var(--gray-100);
  border-radius: var(--radius-lg);
}

.value-card .icon {
  font-size: 40px;
  margin-bottom: 16px;
}

.products-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.product-list-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 24px;
  padding: 32px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-lg);
  transition: 0.3s;
}

.product-list-item:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
}

.product-list-icon {
  width: 120px;
  height: 120px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
}

.product-list-item h3 {
  font-size: 22px;
  margin-bottom: 8px;
}

.product-list-item .tag {
  display: inline-block;
  background: rgba(13, 79, 139, 0.1);
  color: var(--primary);
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 12px;
}

.spec-preview {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
}

.spec-preview span {
  font-size: 12px;
  background: var(--gray-100);
  padding: 4px 10px;
  border-radius: 4px;
}

.product-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.product-detail-image {
  background: var(--gray-100);
  border-radius: var(--radius-lg);
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 120px;
  border: 1px solid var(--gray-300);
}

.product-detail-info h1 {
  font-size: 32px;
  margin-bottom: 8px;
}

.product-detail-info .subtitle {
  color: var(--gray-500);
  margin-bottom: 24px;
}

.feature-list li {
  padding: 10px 0 10px 28px;
  position: relative;
  border-bottom: 1px solid var(--gray-100);
}

.feature-list li::before {
  content: "●";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 10px;
  top: 14px;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 24px;
}

.spec-table th,
.spec-table td {
  padding: 14px 20px;
  text-align: left;
  border-bottom: 1px solid var(--gray-300);
  font-size: 14px;
}

.spec-table th {
  background: var(--gray-100);
  font-weight: 600;
  width: 35%;
}

.detail-tabs {
  display: flex;
  gap: 4px;
  border-bottom: 2px solid var(--gray-300);
  margin-bottom: 32px;
}

.detail-tab {
  padding: 12px 24px;
  background: none;
  border: none;
  font-size: 15px;
  color: var(--gray-500);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  font-family: inherit;
}

.detail-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.detail-panel {
  display: none;
}

.detail-panel.active {
  display: block;
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.solution-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--gray-300);
}

.solution-header {
  padding: 32px;
  color: var(--white);
}

.solution-header.mining {
  background: linear-gradient(135deg, #78350f, #b45309);
}

.solution-header.food {
  background: linear-gradient(135deg, #166534, #22c55e);
}

.solution-header.clean {
  background: linear-gradient(135deg, #1e40af, #3b82f6);
}

.solution-header.sensor {
  background: linear-gradient(135deg, #5b21b6, #8b5cf6);
}

.solution-body {
  padding: 24px 32px 32px;
}

.solution-body li {
  padding: 8px 0 8px 20px;
  position: relative;
  font-size: 14px;
}

.solution-body li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--primary);
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.support-card {
  padding: 32px;
  background: var(--gray-100);
  border-radius: var(--radius-lg);
  text-align: center;
}

.support-card .icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.faq-item {
  border-bottom: 1px solid var(--gray-300);
}

.faq-question {
  width: 100%;
  padding: 20px 0;
  background: none;
  border: none;
  text-align: left;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  font-family: inherit;
}

.faq-question::after {
  content: "+";
  font-size: 24px;
  color: var(--primary);
}

.faq-item.open .faq-question::after {
  content: "−";
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s;
}

.faq-item.open .faq-answer {
  max-height: 200px;
}

.faq-answer p {
  padding-bottom: 20px;
  color: var(--gray-700);
  font-size: 14px;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-info-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-300);
  padding: 24px 28px;
}

.contact-info-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--gray-100);
}

.contact-info-row:last-child {
  border-bottom: none;
}

.contact-info-label {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  width: 120px;
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-700);
}

.contact-info-icon {
  width: 32px;
  height: 32px;
  background: var(--gray-100);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

.contact-info-value {
  background: var(--gray-100);
  padding: 8px 16px;
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--gray-700);
  flex: 1;
  word-break: break-all;
}

.contact-form {
  background: var(--gray-100);
  padding: 40px;
  border-radius: var(--radius-lg);
}

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

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

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 14px;
  font-family: inherit;
  background: var(--white);
}

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

@media (max-width: 992px) {

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

  .product-detail,
  .about-intro,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .app-panel {
    grid-template-columns: 1fr;
    padding: 32px;
  }
}

@media (max-width: 768px) {
  .nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 16px;
    box-shadow: var(--shadow);
    transform: translateY(-120%);
    opacity: 0;
    transition: 0.3s;
  }

  .nav.open {
    transform: translateY(0);
    opacity: 1;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-stats,
  .product-grid,
  .advantage-grid,
  .products-list,
  .solution-grid,
  .support-grid,
  .values-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .product-list-item {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .cta-inner {
    flex-direction: column;
    text-align: center;
  }
}

/* 右侧悬浮联系栏 */
.side-contact {
  position: fixed;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 9999;
  width: 60px;
  box-shadow: -2px 0 16px rgba(0, 0, 0, 0.12);
}

.side-contact-header {
  background: #1a1a1a;
  width: 60px;
  padding: 14px 4px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  cursor: default;
}

.side-contact-header svg {
  width: 22px;
  height: 22px;
  color: #fff;
  stroke: #fff;
  flex-shrink: 0;
}

.side-contact-header span {
  writing-mode: vertical-rl;
  color: #fff;
  font-size: 13px;
  letter-spacing: 3px;
  font-weight: 500;
}

.side-contact-item {
  position: relative;
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.3s;
  text-decoration: none;
}

.side-contact-item.phone {
  background: #0d4f8b;
}
.side-contact-item.phone:hover {
  background: #083a66;
}

.side-contact-item.email {
  background: #00a896;
}
.side-contact-item.email:hover {
  background: #007f6e;
}

.side-contact-item.wechat {
  background: #07c160;
}
.side-contact-item.wechat:hover {
  background: #059a4a;
}

.side-contact-item svg {
  width: 24px;
  height: 24px;
  color: #fff;
  stroke: #fff;
  flex-shrink: 0;
}

.side-contact-item .tooltip {
  position: absolute;
  right: 70px;
  top: 50%;
  transform: translateY(-50%);
  background: #333;
  color: #fff;
  padding: 10px 16px;
  border-radius: 6px;
  font-size: 14px;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
  pointer-events: none;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.side-contact-item .tooltip::after {
  content: "";
  position: absolute;
  right: -6px;
  top: 50%;
  transform: translateY(-50%);
  border: 6px solid transparent;
  border-left-color: #333;
}

.side-contact-item:hover .tooltip {
  opacity: 1;
  visibility: visible;
}

.tooltip-qr {
  white-space: normal !important;
  width: 160px;
  padding: 12px !important;
  text-align: center;
}

.tooltip-qr img {
  width: 120px;
  height: 120px;
  display: block;
  margin: 0 auto 8px;
}

.tooltip-qr p {
  font-size: 12px;
  color: #fff;
  margin: 0;
}

@media (max-width: 768px) {
  .side-contact {
    display: none;
  }
}