/* ===== 上海悦乐欣网络科技有限公司 - 官网全局样式 ===== */

/* Language Switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--bg2);
  border-radius: 50px;
  padding: 3px;
  border: 1px solid var(--rule);
}

.lang-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 30px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  padding: 0;
}

.lang-btn:hover {
  color: var(--ink);
}

.lang-btn.active {
  background: var(--white);
  color: var(--accent);
  box-shadow: var(--shadow-sm);
}

/* CSS Variables */
:root {
  --bg: #FFFFFF;
  --bg2: #FFF8F6;
  --bg3: #FFF0EC;
  --ink: #1A1A2E;
  --ink-light: #3D3D5C;
  --muted: #8E8EA0;
  --rule: #E8E8EE;
  --accent: #FF6B6B;
  --accent-dark: #E85555;
  --accent2: #FF8E53;
  --accent3: #A78BFA;
  --white: #FFFFFF;
  --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.06);
  --shadow-md: 0 4px 20px rgba(26, 26, 46, 0.08);
  --shadow-lg: 0 8px 40px rgba(26, 26, 46, 0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

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

ul, ol {
  list-style: none;
}

/* ===== Navigation ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--rule);
  transition: var(--transition);
}

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

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--ink);
}

.nav-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  margin-left: auto;
  margin-right: 1rem;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink-light);
  position: relative;
  padding: 0.25rem 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 1px;
  transition: width 0.3s ease;
}

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

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

/* Mobile menu toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding-top: 72px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.92) 0%, rgba(255, 248, 246, 0.88) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  padding: 2rem;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1.2rem;
  background: var(--bg3);
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.2rem;
  letter-spacing: -0.02em;
}

.hero h1 .gradient-text {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.15rem;
  color: var(--ink-light);
  line-height: 1.8;
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  outline: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: var(--white);
  box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(255, 107, 107, 0.4);
}

.btn-secondary {
  background: var(--white);
  color: var(--ink);
  border: 1.5px solid var(--rule);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  background: var(--accent);
  color: var(--white);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 1rem 2.5rem;
  font-size: 1.05rem;
}

/* ===== Section ===== */
.section {
  padding: 6rem 2rem;
}

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

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-header .section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 0.8rem;
}

.section-header h2 {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-header p {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ===== Feature Cards ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.feature-card {
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  transition: var(--transition);
  text-align: center;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1.5rem;
  background: var(--bg2);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature-icon svg {
  width: 28px;
  height: 28px;
  color: var(--accent);
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.7;
}

/* ===== Stats ===== */
.stats-section {
  background: var(--bg2);
  padding: 4rem 2rem;
}

.stats-grid {
  display: flex;
  justify-content: center;
  gap: 6rem;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

@media (max-width: 768px) {
  .stats-grid {
    flex-direction: column;
    gap: 2rem;
  }
}

.stat-item .stat-number {
  font-size: 2.8rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.stat-item .stat-label {
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: 0.3rem;
}

/* ===== About Content ===== */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.about-text h3 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.about-text p {
  color: var(--ink-light);
  line-height: 1.8;
  margin-bottom: 1.2rem;
}

.about-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.about-image img {
  width: 100%;
  height: 400px;
  object-fit: cover;
}

/* ===== Timeline ===== */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--rule);
}

.timeline-item {
  position: relative;
  padding-bottom: 2.5rem;
  padding-left: 2rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2rem;
  top: 0.3rem;
  width: 12px;
  height: 12px;
  background: var(--accent);
  border-radius: 50%;
  border: 3px solid var(--bg);
  transform: translateX(-5px);
}

.timeline-item .timeline-year {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.3rem;
}

.timeline-item h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.timeline-item p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ===== Product Card ===== */
.product-showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.product-info h3 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.product-info p {
  color: var(--ink-light);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.product-features-list {
  margin-bottom: 2rem;
}

.product-features-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
  margin-bottom: 1rem;
  font-size: 0.95rem;
  color: var(--ink-light);
}

.product-features-list li .check-icon {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  background: var(--bg3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  margin-top: 0.15rem;
}

.product-visual {
  background: var(--bg2);
  border-radius: var(--radius-xl);
  padding: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-visual img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

/* ===== Download Section ===== */
.download-section {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: var(--radius-xl);
  padding: 4rem;
  text-align: center;
  color: var(--white);
  max-width: 900px;
  margin: 0 auto;
}

.download-section h3 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.download-section p {
  font-size: 1.05rem;
  opacity: 0.9;
  margin-bottom: 2rem;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.btn-white {
  background: var(--white);
  color: var(--accent);
  font-weight: 700;
  padding: 1rem 2.5rem;
  border-radius: 50px;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1rem;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

/* ===== Contact ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.contact-info-card {
  background: var(--bg2);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  align-items: flex-start;
  gap: 1.2rem;
  transition: var(--transition);
}

.contact-info-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.contact-info-card .card-icon {
  width: 48px;
  height: 48px;
  background: var(--white);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-info-card .card-icon svg {
  width: 22px;
  height: 22px;
  color: var(--accent);
}

.contact-info-card h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.contact-info-card p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.6;
}

.contact-map {
  border-radius: var(--radius-lg);
  overflow: hidden;
  height: 350px;
  background: var(--bg2);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--rule);
}

.contact-map iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* ===== Footer ===== */
.footer {
  background: var(--ink);
  color: rgba(255, 255, 255, 0.7);
  padding: 4rem 2rem 2rem;
}

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

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand .footer-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 1rem;
}

.footer-brand .footer-logo .logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.7;
  max-width: 300px;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 1.2rem;
}

.footer-col a {
  display: block;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 0.8rem;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 2rem;
  text-align: center;
  font-size: 0.85rem;
}

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

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

/* ===== Page Hero (sub pages) ===== */
.page-hero {
  padding-top: 72px;
  position: relative;
  overflow: hidden;
}

.page-hero-bg {
  position: relative;
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-hero-bg img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26, 26, 46, 0.7) 0%, rgba(26, 26, 46, 0.5) 100%);
}

.page-hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--white);
  padding: 2rem;
}

.page-hero-content h1 {
  font-size: 2.8rem;
  font-weight: 800;
  margin-bottom: 0.8rem;
  letter-spacing: -0.02em;
}

.page-hero-content p {
  font-size: 1.1rem;
  opacity: 0.85;
  max-width: 500px;
  margin: 0 auto;
}

/* ===== Values Grid ===== */
.values-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.value-card {
  background: var(--bg2);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: var(--transition);
}

.value-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.value-card .value-icon {
  margin-bottom: 1rem;
}

.value-card .value-icon svg {
  width: 32px;
  height: 32px;
  color: var(--accent);
}

.value-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.value-card p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.7;
}

/* ===== Feature Detail ===== */
.feature-detail-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.feature-detail-card {
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}

.feature-detail-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.feature-detail-card .card-image {
  height: 200px;
  overflow: hidden;
}

.feature-detail-card .card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.feature-detail-card:hover .card-image img {
  transform: scale(1.05);
}

.feature-detail-card .card-body {
  padding: 1.5rem;
}

.feature-detail-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.feature-detail-card p {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.7;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  .stats-grid {
    flex-direction: column;
    gap: 2rem;
  }

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

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--rule);
    box-shadow: var(--shadow-md);
  }

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

  .nav-toggle {
    display: flex;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .section-header h2 {
    font-size: 1.8rem;
  }

  .about-content,
  .product-showcase,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .feature-grid,
  .feature-detail-grid {
    grid-template-columns: 1fr;
  }

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

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

  .footer-bottom {
    text-align: center;
  }

  .download-section {
    padding: 2.5rem 1.5rem;
  }

  .page-hero-bg {
    height: 300px;
  }

  .page-hero-content h1 {
    font-size: 2rem;
  }

  .stats-grid {
    flex-direction: column;
    gap: 2rem;
  }

  .stat-item .stat-number {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .section {
    padding: 4rem 1.2rem;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

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

  .btn {
    width: 100%;
    justify-content: center;
  }
}

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

.fade-in-up {
  animation: fadeInUp 0.6s ease forwards;
}

.fade-in-up-delay-1 { animation-delay: 0.1s; opacity: 0; }
.fade-in-up-delay-2 { animation-delay: 0.2s; opacity: 0; }
.fade-in-up-delay-3 { animation-delay: 0.3s; opacity: 0; }