/* ==========================================
   开乐换 - 微信换支付宝平台 全站样式
   域名: kailehuan.cn
   ========================================== */

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

:root {
  --primary: #1a73e8;
  --primary-dark: #1557b0;
  --primary-light: #e8f0fe;
  --secondary: #07c160;
  --secondary-dark: #06ad56;
  --accent: #ff6b35;
  --text: #333333;
  --text-light: #666666;
  --text-muted: #999999;
  --bg: #ffffff;
  --bg-light: #f7f9fc;
  --bg-gray: #f0f2f5;
  --border: #e5e7eb;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --radius: 8px;
  --radius-lg: 16px;
  --max-width: 1200px;
  --header-height: 64px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.3s;
}

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

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

ul, ol {
  list-style: none;
}

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ==================== Header ==================== */
.site-header {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.site-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--secondary), var(--primary));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.2rem;
  font-weight: 900;
}

.nav-menu {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-menu a {
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 4px 0;
  position: relative;
  transition: color 0.3s;
}

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

.nav-menu a.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
}

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

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: 0.3s;
}

/* ==================== Hero Section ==================== */
.hero {
  background: linear-gradient(135deg, #1a73e8 0%, #07c160 100%);
  color: #fff;
  padding: 60px 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: rgba(255,255,255,0.05);
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: rgba(255,255,255,0.03);
  border-radius: 50%;
}

.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 60px;
}

.hero-text {
  flex: 1;
}

.hero-text h1 {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-text h1 span {
  display: inline-block;
  background: rgba(255,255,255,0.2);
  padding: 0 12px;
  border-radius: 6px;
}

.hero-text p {
  font-size: 1.1rem;
  line-height: 1.8;
  opacity: 0.95;
  margin-bottom: 28px;
}

.hero-image {
  flex: 0 0 420px;
}

.hero-image img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 32px;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  border: 2px solid transparent;
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--primary-light);
  border-color: var(--primary-light);
  color: var(--primary-dark);
}

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

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

.btn-accent {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.btn-accent:hover {
  background: #e55a2b;
  border-color: #e55a2b;
}

.btn-secondary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.btn-secondary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
}

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

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

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

.section-title h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
}

.section-title p {
  font-size: 1.05rem;
  color: var(--text-light);
  max-width: 680px;
  margin: 0 auto;
}

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

.feature-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: all 0.3s;
  text-align: center;
}

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

.feature-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}

.feature-icon.blue {
  background: var(--primary-light);
  color: var(--primary);
}

.feature-icon.green {
  background: #e6f9ef;
  color: var(--secondary);
}

.feature-icon.orange {
  background: #fff3ed;
  color: var(--accent);
}

.feature-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text);
}

.feature-card p {
  color: var(--text-light);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ==================== Process Steps ==================== */
.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}

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

.step-number {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 50%;
  color: #fff;
  font-size: 1.4rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  position: relative;
  z-index: 1;
}

.process-step:not(:last-child)::after {
  content: '';
  position: absolute;
  top: 28px;
  left: calc(50% + 36px);
  right: calc(-50% + 36px);
  height: 2px;
  background: var(--border);
  z-index: 0;
}

.process-step h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}

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

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

.advantage-item {
  display: flex;
  gap: 20px;
  padding: 24px;
  background: var(--bg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: all 0.3s;
}

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

.advantage-icon {
  flex: 0 0 56px;
  height: 56px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  background: var(--primary-light);
  color: var(--primary);
}

.advantage-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
}

.advantage-content p {
  color: var(--text-light);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ==================== Image Section ==================== */
.image-section {
  display: flex;
  align-items: center;
  gap: 60px;
}

.image-section.reverse {
  flex-direction: row-reverse;
}

.image-section .image-wrapper {
  flex: 0 0 45%;
}

.image-section .image-wrapper img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.image-section .text-content {
  flex: 1;
}

.image-section .text-content h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text);
}

.image-section .text-content p {
  color: var(--text-light);
  font-size: 1rem;
  line-height: 1.9;
  margin-bottom: 16px;
}

/* ==================== FAQ ==================== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: all 0.3s;
}

.faq-item:hover {
  border-color: var(--primary);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
  background: var(--bg);
  border: none;
  width: 100%;
  text-align: left;
  transition: background 0.3s;
}

.faq-question:hover {
  background: var(--bg-light);
}

.faq-question .icon {
  font-size: 1.2rem;
  color: var(--primary);
  transition: transform 0.3s;
  flex-shrink: 0;
  margin-left: 12px;
}

.faq-item.open .faq-question .icon {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item.open .faq-answer {
  padding: 0 24px 20px;
  max-height: 500px;
}

.faq-answer p {
  color: var(--text-light);
  font-size: 0.95rem;
  line-height: 1.8;
}

/* ==================== CTA Section ==================== */
.cta-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #fff;
  text-align: center;
  padding: 80px 0;
}

.cta-section h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-section p {
  font-size: 1.1rem;
  opacity: 0.9;
  margin-bottom: 32px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ==================== Breadcrumb ==================== */
.breadcrumb {
  padding: 16px 0;
  background: var(--bg-light);
  border-bottom: 1px solid var(--border);
}

.breadcrumb-inner {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.breadcrumb-inner a {
  color: var(--text-light);
}

.breadcrumb-inner a:hover {
  color: var(--primary);
}

.breadcrumb-inner .separator {
  color: var(--text-muted);
}

.breadcrumb-inner .current {
  color: var(--text);
}

/* ==================== Page Banner ==================== */
.page-banner {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: #fff;
  padding: 60px 0;
  text-align: center;
}

.page-banner h1 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.page-banner p {
  font-size: 1.1rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto;
}

/* ==================== Content Article ==================== */
.content-article {
  padding: 60px 0;
}

.article-content {
  max-width: 860px;
  margin: 0 auto;
}

.article-content h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
  margin: 40px 0 16px;
  padding-left: 16px;
  border-left: 4px solid var(--primary);
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  margin: 28px 0 12px;
}

.article-content p {
  color: var(--text-light);
  font-size: 1rem;
  line-height: 1.9;
  margin-bottom: 16px;
}

.article-content ul, .article-content ol {
  margin: 12px 0 16px 20px;
}

.article-content li {
  color: var(--text-light);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 6px;
  list-style: disc;
}

.article-content ol li {
  list-style: decimal;
}

.article-content img {
  border-radius: var(--radius);
  margin: 24px 0;
  box-shadow: var(--shadow);
}

.article-content .highlight-box {
  background: var(--primary-light);
  border-left: 4px solid var(--primary);
  padding: 20px 24px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 24px 0;
}

.article-content .highlight-box p {
  color: var(--text);
  margin-bottom: 0;
}

/* ==================== Contact Info ==================== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.contact-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  text-align: center;
  transition: all 0.3s;
}

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

.contact-card .card-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  background: var(--primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: var(--primary);
}

.contact-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}

.contact-card p {
  color: var(--text-light);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ==================== Service Detail Cards ==================== */
.service-detail-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.service-detail-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 0.3s;
}

.service-detail-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.service-detail-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.service-detail-card .card-body {
  padding: 28px;
}

.service-detail-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text);
}

.service-detail-card p {
  color: var(--text-light);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 12px;
}

.service-detail-card .card-tag {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
  margin-right: 6px;
  margin-bottom: 6px;
}

/* ==================== Stats Bar ==================== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin: 40px 0;
}

.stat-item {
  text-align: center;
  padding: 24px 16px;
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-light);
}

/* ==================== Footer ==================== */
.site-footer {
  background: #1a1f2e;
  color: rgba(255,255,255,0.7);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand h3 {
  font-size: 1.4rem;
  color: #fff;
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

.footer-col h4 {
  font-size: 1rem;
  color: #fff;
  margin-bottom: 16px;
  font-weight: 600;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
  transition: color 0.3s;
}

.footer-col ul li a:hover {
  color: #fff;
}

.footer-bottom {
  padding: 20px 0;
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.4);
}

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

.footer-bottom a:hover {
  color: #fff;
}

/* ==================== Mobile Responsive ==================== */
@media (max-width: 992px) {
  .hero-content {
    flex-direction: column;
    gap: 32px;
  }

  .hero-image {
    flex: 0 0 auto;
    max-width: 400px;
  }

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

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

  .process-step:not(:last-child)::after {
    display: none;
  }

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

  .image-section {
    flex-direction: column;
    gap: 32px;
  }

  .image-section.reverse {
    flex-direction: column;
  }

  .image-section .image-wrapper {
    flex: 0 0 auto;
    width: 100%;
  }

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

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

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

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  .nav-menu {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg);
    flex-direction: column;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    gap: 0;
  }

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

  .nav-menu a {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    font-size: 1rem;
  }

  .nav-menu a:last-child {
    border-bottom: none;
  }

  .menu-toggle {
    display: flex;
  }

  .hero {
    padding: 40px 0;
  }

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

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

  .hero-image {
    max-width: 100%;
  }

  .section {
    padding: 48px 0;
  }

  .section-title h2 {
    font-size: 1.5rem;
  }

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

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

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .page-banner {
    padding: 40px 0;
  }

  .page-banner h1 {
    font-size: 1.6rem;
  }

  .article-content h2 {
    font-size: 1.3rem;
  }

  .cta-section h2 {
    font-size: 1.5rem;
  }

  .stat-number {
    font-size: 1.6rem;
  }

  .image-section .text-content h2 {
    font-size: 1.4rem;
  }
}

/* ==================== Animations ==================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

/* Utility */
.text-center { text-align: center; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }