/*! HTML5 Boilerplate v9.0.1 | MIT License | https://html5boilerplate.com/ */

/* ==========================================================================
   优选到家 - 企业官网样式
   ========================================================================== */

/* 基础重置和变量 */
:root {
  --primary-color: #1976D2;
  --primary-light: #42A5F5;
  --primary-dark: #1565C0;
  --secondary-color: #FF9800;
  --accent-color: #E3F2FD;
  --text-dark: #1a1a2e;
  --text-light: #5a5a6e;
  --text-lighter: #8a8a9a;
  --bg-white: #ffffff;
  --bg-light: #f8fafb;
  --bg-gradient: linear-gradient(135deg, #1976D2 0%, #42A5F5 100%);
  --shadow: 0 2px 8px rgba(25, 118, 210, 0.08);
  --shadow-hover: 0 8px 24px rgba(25, 118, 210, 0.15);
  --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.05);
  --radius: 16px;
  --radius-lg: 24px;
  --radius-sm: 8px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  color: var(--text-dark);
  font-size: 1em;
  line-height: 1.6;
  scroll-behavior: smooth;
}

::-moz-selection {
  background: var(--primary-light);
  color: white;
  text-shadow: none;
}

::selection {
  background: var(--primary-light);
  color: white;
  text-shadow: none;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-dark);
  background-color: var(--bg-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* ==========================================================================
   导航栏
   ========================================================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(25, 118, 210, 0.06);
  z-index: 1000;
  transition: var(--transition);
}

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

.logo a {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--primary-color);
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: -0.5px;
}

.logo-icon {
  font-size: 1.6rem;
  margin-right: 10px;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 48px;
}

.nav-link {
  text-decoration: none;
  color: var(--text-dark);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding: 8px 0;
  transition: var(--transition);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--primary-color);
  border-radius: 2px;
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--primary-color);
}

.nav-link:hover::after {
  width: 24px;
}

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  padding: 5px;
}

.bar {
  width: 24px;
  height: 2px;
  background: var(--primary-color);
  margin: 4px 0;
  border-radius: 2px;
  transition: var(--transition);
}

/* ==========================================================================
   首页横幅
   ========================================================================== */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--bg-gradient);
  overflow: hidden;
  padding-top: 72px;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 80%;
  height: 200%;
  background: radial-gradient(ellipse, rgba(255,255,255,0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
  opacity: 0.03;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: var(--bg-white);
  max-width: 720px;
  margin: 0 auto;
  padding: 80px 24px;
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 700;
  margin-bottom: 24px;
  line-height: 1.15;
  letter-spacing: -1px;
}

.highlight {
  color: var(--secondary-color);
  position: relative;
}

.hero-subtitle {
  font-size: 1.5rem;
  font-weight: 400;
  margin-bottom: 20px;
  opacity: 0.95;
  color: rgba(255, 255, 255, 0.9);
}

.hero-desc {
  font-size: 1.05rem;
  opacity: 0.85;
  margin-bottom: 48px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.8);
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 72px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 16px 36px;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  letter-spacing: 0.3px;
}

.btn-primary {
  background: var(--secondary-color);
  color: var(--text-dark);
  box-shadow: 0 4px 16px rgba(255, 179, 71, 0.35);
}

.btn-primary:hover {
  background: #ffa52e;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 179, 71, 0.45);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.12);
  color: var(--bg-white);
  border: 1.5px solid rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.6);
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 80px;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
  position: relative;
}

.stat-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: -40px;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 40px;
  background: rgba(255, 255, 255, 0.2);
}

.stat-number {
  display: block;
  font-size: 2.4rem;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1;
}

.stat-label {
  font-size: 0.9rem;
  opacity: 0.75;
  font-weight: 400;
}

/* ==========================================================================
   通用区块样式
   ========================================================================== */

section {
  padding: 120px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 72px;
}

.section-tag {
  display: inline-block;
  color: var(--primary-color);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 16px;
  padding: 6px 16px;
  background: var(--accent-color);
  border-radius: 20px;
}

.section-title {
  font-size: 2.4rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-dark);
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-light);
  max-width: 480px;
  margin: 0 auto;
}

/* ==========================================================================
   关于我们 - 全新设计
   ========================================================================== */

.about {
  background: var(--bg-light);
}

.about-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.about-main {
  padding-top: 8px;
}

.about-main h3 {
  font-size: 1.9rem;
  color: var(--text-dark);
  margin-bottom: 24px;
  font-weight: 600;
  line-height: 1.3;
}

.about-main .company-name {
  color: var(--primary-color);
  font-weight: 700;
}

.about-main p {
  color: var(--text-light);
  margin-bottom: 20px;
  line-height: 1.8;
  font-size: 1rem;
}

.about-highlights {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 32px;
}

.about-highlight-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: var(--bg-white);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(25, 118, 210, 0.08);
  transition: var(--transition);
}

.about-highlight-item:hover {
  border-color: rgba(25, 118, 210, 0.2);
  box-shadow: var(--shadow);
  transform: translateX(4px);
}

.about-highlight-icon {
  width: 36px;
  height: 36px;
  background: var(--bg-gradient);
  color: white;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.about-highlight-text {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-dark);
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.about-stat-card {
  background: var(--bg-white);
  padding: 32px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(13, 115, 119, 0.06);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.about-stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--bg-gradient);
  transform: scaleX(0);
  transition: transform 0.4s ease;
}

.about-stat-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

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

.about-stat-number {
  font-size: 2.6rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 8px;
  line-height: 1;
}

.about-stat-label {
  font-size: 0.95rem;
  color: var(--text-light);
  margin-bottom: 12px;
}

.about-stat-desc {
  font-size: 0.85rem;
  color: var(--text-lighter);
  line-height: 1.5;
}

/* ==========================================================================
   服务项目
   ========================================================================== */

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

.service-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 40px 32px;
  text-align: center;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
  border: 1px solid rgba(13, 115, 119, 0.06);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 0;
  background: var(--bg-gradient);
  transition: height 0.3s ease;
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
  border-color: transparent;
}

.service-card:hover::before {
  height: 4px;
}

.service-icon {
  font-size: 2.8rem;
  margin-bottom: 24px;
  display: inline-block;
  transition: var(--transition);
}

.service-card:hover .service-icon {
  transform: scale(1.1);
}

.service-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-dark);
}

.service-desc {
  color: var(--text-light);
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: 24px;
}

.service-time {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  background: var(--accent-color);
  color: var(--primary-color);
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 500;
}

/* ==========================================================================
   服务特色
   ========================================================================== */

.features {
  background: var(--bg-light);
}

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

.feature-card {
  background: var(--bg-white);
  padding: 40px 32px;
  border-radius: var(--radius);
  text-align: center;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
  border: 1px solid rgba(13, 115, 119, 0.06);
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.feature-icon-box {
  width: 72px;
  height: 72px;
  background: var(--bg-gradient);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 28px;
  transition: var(--transition);
}

.feature-card:hover .feature-icon-box {
  transform: scale(1.05) rotate(4deg);
}

.feature-icon-box .feature-icon {
  font-size: 1.8rem;
}

.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: 12px;
  color: var(--text-dark);
  font-weight: 600;
}

.feature-card p {
  color: var(--text-light);
  font-size: 0.92rem;
  line-height: 1.7;
}

/* ==========================================================================
   服务流程
   ========================================================================== */

.process {
  background: var(--bg-white);
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  position: relative;
}

.process-steps::before {
  content: '';
  position: absolute;
  top: 36px;
  left: 14%;
  right: 14%;
  height: 2px;
  background: linear-gradient(to right, var(--primary-color), var(--primary-light), var(--primary-color));
  opacity: 0.2;
  z-index: 0;
}

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

.step-number {
  width: 72px;
  height: 72px;
  background: var(--bg-white);
  color: var(--primary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 auto 24px;
  box-shadow: var(--shadow-card);
  border: 2px solid var(--primary-color);
  transition: var(--transition);
}

.process-step:hover .step-number {
  background: var(--bg-gradient);
  color: white;
  transform: scale(1.08);
}

.step-content h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
  color: var(--text-dark);
  font-weight: 600;
}

.step-content p {
  color: var(--text-light);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ==========================================================================
   联系我们
   ========================================================================== */

.contact {
  background: var(--bg-light);
}

.contact-content {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 80px;
  align-items: center;
}

.contact-info {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 24px;
  background: var(--bg-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(13, 115, 119, 0.06);
  transition: var(--transition);
}

.contact-item:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

.contact-icon {
  font-size: 1.5rem;
  width: 48px;
  height: 48px;
  background: var(--accent-color);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-detail h4 {
  font-size: 0.85rem;
  color: var(--text-lighter);
  margin-bottom: 6px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.contact-detail p {
  font-size: 1rem;
  color: var(--text-dark);
  font-weight: 600;
}

.contact-qr {
  display: flex;
  justify-content: center;
}

.qr-image-wrapper {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(25, 118, 210, 0.08);
  transition: var(--transition);
}

.qr-image-wrapper:hover {
  box-shadow: var(--shadow-hover);
}

.qr-image {
  width: 200px;
  height: 200px;
  border-radius: var(--radius-sm);
  display: block;
  object-fit: cover;
}

.qr-caption {
  margin-top: 20px;
  color: var(--primary-color);
  font-weight: 600;
  font-size: 0.95rem;
}

.qr-subcaption {
  margin-top: 6px;
  color: var(--text-lighter);
  font-size: 0.8rem;
}

/* ==========================================================================
   页脚
   ========================================================================== */

.footer {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  color: var(--bg-white);
  padding: 80px 0 32px;
}

.footer-content {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 80px;
  margin-bottom: 60px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.footer-logo {
  font-size: 1.6rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-brand p {
  opacity: 0.7;
  font-size: 0.95rem;
  max-width: 320px;
  line-height: 1.7;
}

.footer-links {
  display: flex;
  gap: 60px;
  justify-content: flex-end;
}

.footer-link-group h4 {
  font-size: 0.9rem;
  margin-bottom: 24px;
  opacity: 0.95;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.footer-link-group ul {
  list-style: none;
}

.footer-link-group li {
  margin-bottom: 14px;
}

.footer-link-group a {
  color: var(--bg-white);
  text-decoration: none;
  opacity: 0.6;
  transition: var(--transition);
  font-size: 0.9rem;
}

.footer-link-group a:hover {
  opacity: 1;
  color: var(--secondary-color);
}

.footer-bottom {
  text-align: center;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-bottom p {
  opacity: 0.5;
  font-size: 0.85rem;
  margin: 6px 0;
}

/* ==========================================================================
   响应式设计
   ========================================================================== */

@media (max-width: 992px) {
  .hero-title {
    font-size: 2.6rem;
  }

  .hero-subtitle {
    font-size: 1.25rem;
  }

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

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

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

  .about-wrapper,
  .contact-content {
    grid-template-columns: 1fr;
    gap: 60px;
  }

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

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

  .footer-content {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .footer-links {
    justify-content: flex-start;
  }

  .stat-item:not(:last-child)::after {
    display: none;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    left: -100%;
    top: 72px;
    flex-direction: column;
    background: var(--bg-white);
    width: 100%;
    text-align: center;
    transition: var(--transition);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    padding: 32px 0;
    gap: 8px;
  }

  .nav-menu.active {
    left: 0;
  }

  .nav-link {
    display: block;
    padding: 16px;
    font-size: 1.1rem;
  }

  .hamburger {
    display: flex;
  }

  .hamburger.active .bar:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
  }

  .hamburger.active .bar:nth-child(2) {
    opacity: 0;
  }

  .hamburger.active .bar:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 220px;
  }

  .hero-stats {
    gap: 40px;
  }

  .stat-item:not(:last-child)::after {
    display: none;
  }

  .stat-number {
    font-size: 1.8rem;
  }

  section {
    padding: 80px 0;
  }

  .section-title {
    font-size: 1.9rem;
  }

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

  .process-steps {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .process-step {
    display: flex;
    align-items: center;
    gap: 24px;
    text-align: left;
    padding: 24px;
    background: var(--bg-light);
    border-radius: var(--radius);
  }

  .step-number {
    margin: 0;
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    font-size: 1.3rem;
  }

  .about-highlights {
    grid-template-columns: 1fr;
  }

  .about-stats {
    grid-template-columns: 1fr;
  }

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

  .contact-content {
    gap: 48px;
  }

  .footer-links {
    flex-direction: column;
    gap: 32px;
  }
}

@media (max-width: 480px) {
  .hero {
    padding-top: 72px;
    min-height: auto;
  }

  .hero-content {
    padding: 60px 20px;
  }

  .hero-title {
    font-size: 1.7rem;
  }

  section {
    padding: 60px 0;
  }

  .container {
    padding: 0 20px;
  }

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

  .service-card,
  .feature-card {
    padding: 32px 24px;
  }

  .contact-item {
    padding: 20px;
  }

  .about-stat-card {
    padding: 24px;
  }
}

/* ==========================================================================
   动画效果
   ========================================================================== */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.service-card,
.feature-card {
  opacity: 0;
}

.service-card.visible,
.feature-card.visible {
  animation: fadeInUp 0.6s ease-out forwards;
}

/* ==========================================================================
   打印样式
   ========================================================================== */

@media print {
  .header,
  .hero-buttons,
  .footer {
    display: none;
  }

  .hero {
    min-height: auto;
    padding: 40px 0;
    background: var(--primary-color) !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  section {
    padding: 40px 0;
  }
}

/* ==========================================================================
   服务展示
   ========================================================================== */

.showcase {
  background: var(--bg-light);
  padding: 80px 0;
}

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

.showcase-image {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}

.showcase-image:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
}

.showcase-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

@media (max-width: 992px) {
  .showcase-wrapper {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .showcase-image {
    max-width: 400px;
    margin: 0 auto;
  }
}