/* ==========================================
   乐途教育 LETU Education Group — MVP 样式
   主色调：蓝色系
   ========================================== */

:root {
  --blue-900: #1a365d;
  --blue-700: #2b6cb0;
  --blue-600: #2c5282;
  --blue-500: #3182ce;
  --blue-400: #4299e1;
  --blue-100: #ebf8ff;
  --blue-50: #f0f7ff;
  --gray-900: #1a202c;
  --gray-700: #4a5568;
  --gray-500: #718096;
  --gray-200: #e2e8f0;
  --gray-100: #f7fafc;
  --white: #ffffff;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--gray-900);
  line-height: 1.6;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================
   导航栏
   ========================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--gray-200);
  transition: box-shadow 0.3s;
}

.navbar.scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--blue-700);
  text-decoration: none;
  letter-spacing: 1px;
  white-space: nowrap;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 28px;
}

.nav-menu a {
  text-decoration: none;
  color: var(--gray-700);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-menu a:hover {
  color: var(--blue-500);
}

/* 移动端汉堡菜单 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--gray-700);
  border-radius: 2px;
  transition: all 0.3s;
}

/* ==========================================
   第1屏：Hero — 顾问卡片横向滑动
   ========================================== */
/* ==========================================
   Hero 轮播
   ========================================== */
.hero {
  position: relative;
  width: 100%;
  overflow: hidden;
}

.carousel {
  position: relative;
  width: 100%;
  height: 580px;
}

.carousel-slide {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-color: var(--blue-900);
  opacity: 0;
  transition: opacity 0.8s ease;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}

.carousel-slide.active {
  opacity: 1;
}

.carousel-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(0,0,0,0.25) 0%, rgba(0,0,0,0.82) 100%);
}

.carousel-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--white);
  padding: 0 24px 72px;
  max-width: 800px;
  width: 100%;
}

.carousel-title {
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: 3px;
  margin-bottom: 16px;
  text-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.carousel-subtitle {
  font-size: 1.1rem;
  font-weight: 300;
  letter-spacing: 2px;
  opacity: 0.9;
  margin-bottom: 36px;
}

/* 左右箭头 */
.carousel-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 50%;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--white);
  transition: background 0.2s;
}

.carousel-arrow:hover {
  background: rgba(255,255,255,0.3);
}

.carousel-arrow svg {
  width: 20px;
  height: 20px;
}

.carousel-arrow--prev { left: 24px; }
.carousel-arrow--next { right: 24px; }

/* 圆点导航 */
.carousel-dots {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 10;
}

.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.4);
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}

.carousel-dot.active {
  background: var(--white);
  transform: scale(1.2);
}

/* ==========================================
   顾问团队 Section
   ========================================== */
.team {
  padding: 80px 0;
  background: var(--white);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-top: 48px;
}

/* 竖版大图卡片 */
.team-card {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(0,0,0,0.1);
  transition: transform 0.2s, box-shadow 0.2s;
}

.team-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 28px rgba(0,0,0,0.15);
}

/* 3:4 竖版照片区域 */
.team-card-photo {
  position: relative;
  width: 100%;
  aspect-ratio: 3 / 4;
  background-size: cover;
  background-position: center top;
  background-color: var(--gray-200);
}

/* 底部渐变遮罩 */
.team-card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 45%, rgba(0,0,0,0.72) 100%);
}

/* 文字叠在遮罩上 */
.team-card-info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 16px 14px;
  color: var(--white);
}

.team-card-name {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.team-card-desc {
  font-size: 0.78rem;
  opacity: 0.85;
  line-height: 1.4;
}

.btn-primary {
  display: inline-block;
  padding: 14px 40px;
  background: var(--white);
  color: var(--blue-700);
  text-decoration: none;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

/* ==========================================
   通用标题
   ========================================== */
.section-title {
  text-align: center;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--blue-900);
  margin-bottom: 12px;
}

.section-title::after {
  content: "";
  display: block;
  width: 48px;
  height: 3px;
  background: var(--blue-500);
  margin: 12px auto 0;
  border-radius: 2px;
}

.section-subtitle {
  text-align: center;
  color: var(--gray-500);
  font-size: 0.95rem;
  margin-bottom: 48px;
}

.section-title + .advantages-grid,
.section-title + .contact-card,
.section-title + .about-content {
  margin-top: 48px;
}

/* ==========================================
   第2屏：服务项目
   ========================================== */
.services {
  padding: 80px 0;
  background: var(--white);
}

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

.service-card {
  padding: 36px 28px;
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(43, 108, 176, 0.1);
  border-color: var(--blue-400);
}

.service-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 16px;
  color: var(--blue-500);
}

.service-icon svg {
  width: 100%;
  height: 100%;
}

.service-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--blue-900);
  margin-bottom: 8px;
}

.service-card p {
  font-size: 0.9rem;
  color: var(--gray-700);
  line-height: 1.7;
}

/* ==========================================
   第3屏：为什么选择乐途
   ========================================== */
.advantages {
  padding: 80px 0;
  background: var(--blue-50);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.advantage-item {
  text-align: center;
  padding: 28px 16px;
  background: var(--white);
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.advantage-icon {
  width: 44px;
  height: 44px;
  margin: 0 auto 16px;
  color: var(--blue-500);
}

.advantage-icon svg {
  width: 100%;
  height: 100%;
}

.advantage-item h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--blue-900);
  margin-bottom: 10px;
}

.advantage-item p {
  font-size: 0.85rem;
  color: var(--gray-700);
  line-height: 1.7;
}

/* ==========================================
   第4屏：关于我们
   ========================================== */
.about {
  padding: 80px 0;
  background: var(--white);
}

.about-content {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.about-text p {
  font-size: 1rem;
  color: var(--gray-700);
  line-height: 1.9;
  margin-bottom: 16px;
}

.about-motto {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--blue-700);
  margin-top: 24px;
  letter-spacing: 4px;
}

/* ==========================================
   第5屏：联系我们
   ========================================== */
.contact {
  padding: 80px 0;
  background: var(--blue-50);
}

/* 单卡片：所有联系信息集中在一张卡里 */
.contact-card {
  max-width: 680px;
  margin: 0 auto;
  background: var(--white);
  border-radius: 16px;
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.06);
  padding: 8px 0;
}

/* 每行联系信息：图标 + 标签 + 内容 */
.contact-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 32px;
  border-bottom: 1px solid var(--gray-100);
}

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

.contact-row-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  color: var(--blue-500);
}

.contact-row-icon svg {
  width: 100%;
  height: 100%;
}

.contact-row-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--blue-900);
  flex-shrink: 0;
  width: 90px;
}

.contact-row-value {
  font-size: 0.9rem;
  color: var(--gray-700);
  flex: 1;
}

/* 并排二维码区块 */
.contact-qr-row {
  display: flex;
  gap: 32px;
  padding: 20px 32px 24px;
  border-top: 1px solid var(--gray-100);
}

.qr-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.qr-col-img {
  width: 120px;
  height: 120px;
  border-radius: 8px;
  overflow: hidden;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  display: flex;
  align-items: center;
  justify-content: center;
}

.qr-col-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.qr-col-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--blue-900);
}

.qr-col-sub {
  font-size: 0.8rem;
  color: var(--gray-500);
}

/* 二维码占位（无图片时） */
.qr-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: var(--blue-300);
}

.qr-placeholder-text {
  font-size: 0.72rem;
  color: var(--gray-400);
  text-align: center;
  line-height: 1.4;
}

.qr-placeholder-text small {
  font-size: 0.65rem;
  opacity: 0.8;
}


/* ==========================================
   Footer
   ========================================== */
.footer {
  padding: 24px 0;
  background: var(--blue-900);
  color: rgba(255, 255, 255, 0.6);
  text-align: center;
  font-size: 0.85rem;
}

/* ==========================================
   响应式：移动端
   ========================================== */
@media (max-width: 768px) {
  /* 导航 */
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 16px 24px;
    gap: 16px;
    border-bottom: 1px solid var(--gray-200);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
  }

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

  /* Hero 轮播 */
  .carousel {
    height: 420px;
  }

  .carousel-title {
    font-size: 1.5rem;
    letter-spacing: 1px;
  }

  .carousel-subtitle {
    font-size: 0.9rem;
    letter-spacing: 1px;
    margin-bottom: 24px;
  }

  .carousel-arrow {
    width: 36px;
    height: 36px;
  }

  .carousel-arrow--prev { left: 12px; }
  .carousel-arrow--next { right: 12px; }

  /* 顾问 section 移动端：3列 grid */
  .team-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-top: 24px;
  }

  .team-card-name {
    font-size: 0.85rem;
  }

  .team-card-desc {
    font-size: 0.7rem;
  }

  /* 服务：窄屏 2×2 */
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .service-card {
    padding: 24px 16px;
  }

  /* 优势 */
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  /* 联系：移动端卡片调整 */
  .contact-card {
    border-radius: 12px;
  }

  .contact-row {
    padding: 16px 20px;
    gap: 12px;
  }

  .contact-row-label {
    width: 80px;
    font-size: 0.85rem;
  }

  .contact-row-value {
    font-size: 0.85rem;
  }

  /* 移动端二维码区块 */
  .contact-qr-row {
    padding: 16px 20px 20px;
    gap: 20px;
  }

  .qr-col-img {
    width: 96px;
    height: 96px;
  }

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