/* ========== 严选讲师网 - 全局样式 ========== */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;500;600;700&family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

:root {
  --primary: #8B1A1A;
  --primary-light: #B33A3A;
  --primary-dark: #5C1010;
  --accent: #C4956A;
  --accent-light: #E8C9A0;
  --accent-dark: #A07A4D;
  --text: #2D2D2D;
  --text-light: #555555;
  --text-muted: #888888;
  --bg: #FAF8F5;
  --bg-white: #FFFFFF;
  --bg-cream: #F5F0EB;
  --border: #E8E0D5;
  --shadow: rgba(0,0,0,0.08);
  --shadow-hover: rgba(0,0,0,0.15);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s ease;
  --font-serif: 'Noto Serif SC', 'STSong', 'SimSun', serif;
  --font-sans: 'Noto Sans SC', 'Microsoft YaHei', 'PingFang SC', sans-serif;
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

/* ========== 导航栏 ========== */
.navbar {
  background: var(--bg-white);
  border-bottom: 1px solid var(--border);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: var(--transition);
}

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

.navbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--primary);
}

.logo-icon {
  width: 42px;
  height: 42px;
  background: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 18px;
  font-family: var(--font-serif);
  flex-shrink: 0;
}

.logo-text {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
  padding: 4px 0;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
}

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

.nav-cta {
  background: var(--primary);
  color: #fff !important;
  padding: 8px 20px !important;
  border-radius: 30px;
  transition: var(--transition);
}

.nav-cta:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.nav-cta::after {
  display: none !important;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

/* ========== 页脚 ========== */
.footer {
  background: var(--primary-dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 0;
}

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

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

.footer-brand .logo {
  color: #fff;
  margin-bottom: 16px;
}

.footer-brand .logo-icon {
  background: var(--accent);
  color: var(--primary-dark);
}

.footer-brand .logo-text {
  color: #fff;
}

.footer-brand p {
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(255,255,255,0.6);
}

.footer-title {
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 20px;
  font-family: var(--font-serif);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition);
}

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

.footer-contact p {
  font-size: 0.9rem;
  margin-bottom: 8px;
  color: rgba(255,255,255,0.6);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.4);
}

/* ========== 通用组件 ========== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent-dark);
  margin-bottom: 12px;
  font-family: var(--font-sans);
}

.section-title {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 16px;
  line-height: 1.3;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-light);
  line-height: 1.8;
}

.section-title--left {
  text-align: left;
}

.section-header--left {
  text-align: left;
  margin-left: 0;
  margin-right: 0;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: 30px;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  font-family: var(--font-sans);
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(139,26,26,0.3);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-outline:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}

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

.btn-accent:hover {
  background: var(--accent-dark);
  color: #fff;
  transform: translateY(-2px);
}

/* 卡片 */
.card {
  background: var(--bg-white);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  box-shadow: 0 4px 12px var(--shadow);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px var(--shadow-hover);
}

.card-image {
  width: 100%;
  height: 220px;
  object-fit: cover;
  display: block;
}

.card-body {
  padding: 24px;
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--primary-dark);
  margin-bottom: 8px;
}

.card-text {
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 16px;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* 标签 */
.tag {
  display: inline-block;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 20px;
  background: var(--bg-cream);
  color: var(--primary);
  border: 1px solid var(--border);
}

.tag-primary {
  background: var(--primary);
  color: #fff;
  border: none;
}

.tag-accent {
  background: var(--accent-light);
  color: var(--accent-dark);
  border: none;
}

/* 人物卡片 */
.person-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  box-shadow: 0 4px 12px var(--shadow);
  text-align: center;
}

.person-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px var(--shadow-hover);
}

.person-card .card-image {
  width: 100%;
  height: 280px;
  object-fit: cover;
  object-position: top center;
}

.person-card .card-body {
  padding: 24px 20px;
}

.person-name {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--primary-dark);
  margin-bottom: 4px;
}

.person-title {
  font-size: 0.85rem;
  color: var(--accent-dark);
  margin-bottom: 12px;
  font-weight: 500;
}

.person-desc {
  font-size: 0.85rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* 数据展示 */
.stat-item {
  text-align: center;
  padding: 32px;
}

.stat-number {
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 8px;
}

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

/* 引用块 */
.quote-block {
  background: var(--bg-cream);
  border-left: 4px solid var(--accent);
  padding: 24px 28px;
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
  color: var(--text-light);
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.8;
}

/* 分隔线 */
.divider {
  width: 60px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
  margin: 20px auto;
}

.divider-left {
  margin-left: 0;
}

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

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

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

/* 横向布局 */
.row {
  display: flex;
  gap: 48px;
  align-items: center;
}

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

.row .col-text {
  flex: 1;
}

.row .col-image {
  flex: 1;
}

.col-image img {
  width: 100%;
  border-radius: var(--radius);
  box-shadow: 0 8px 24px var(--shadow);
}

/* 背景变体 */
.bg-white {
  background: var(--bg-white);
}

.bg-cream {
  background: var(--bg-cream);
}

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

.bg-primary .section-title,
.bg-primary .section-desc {
  color: #fff;
}

.bg-primary .section-title {
  opacity: 0.95;
}

.bg-primary .section-desc {
  opacity: 0.8;
}

.bg-primary .divider {
  background: var(--accent-light);
}

/* 步骤/流程 */
.step-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.step-number {
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  flex-shrink: 0;
}

.step-content h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--primary-dark);
  margin-bottom: 8px;
}

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

/* 轮播/图片展示 */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.gallery-item {
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
}

.gallery-item img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  transition: var(--transition);
  display: block;
}

.gallery-item:hover img {
  transform: scale(1.05);
}

.gallery-item-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 20px;
  background: linear-gradient(transparent, rgba(0,0,0,0.7));
  color: #fff;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
  opacity: 0;
}

.gallery-item:hover .gallery-item-overlay {
  opacity: 1;
}

/* 评价/ testimonial */
.testimonial-card {
  background: var(--bg-white);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: 0 4px 12px var(--shadow);
}

.testimonial-text {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text);
  margin-bottom: 24px;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 16px;
}

.testimonial-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  object-fit: cover;
}

.testimonial-name {
  font-weight: 600;
  color: var(--primary-dark);
  font-size: 0.95rem;
}

.testimonial-role {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* 时间线 */
.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding-bottom: 32px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -28px;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg-white);
  box-shadow: 0 0 0 2px var(--accent);
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-date {
  font-size: 0.85rem;
  color: var(--accent-dark);
  font-weight: 600;
  margin-bottom: 4px;
}

.timeline-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--primary-dark);
  margin-bottom: 8px;
}

.timeline-desc {
  font-size: 0.9rem;
  color: var(--text-light);
  line-height: 1.6;
}

/* 列表样式 */
.feature-list {
  list-style: none;
}

.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 1rem;
  color: var(--text-light);
}

.feature-list li::before {
  content: '✓';
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  font-size: 0.75rem;
  flex-shrink: 0;
  margin-top: 2px;
}

/* 横幅/CTA */
.banner-cta {
  background: var(--bg-cream);
  border-radius: var(--radius);
  padding: 48px;
  text-align: center;
  border: 1px solid var(--border);
}

.banner-cta-title {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  color: var(--primary-dark);
  margin-bottom: 12px;
}

.banner-cta-desc {
  font-size: 1rem;
  color: var(--text-light);
  margin-bottom: 24px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 32px;
}

.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
}

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

.breadcrumb-sep {
  opacity: 0.5;
}

/* 回到顶部 */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  font-size: 1.2rem;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

/* ========== 响应式设计 ========== */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .row {
    flex-direction: column;
    gap: 32px;
  }
  .row-reverse {
    flex-direction: column;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
  .section {
    padding: 48px 0;
  }
  .section-title {
    font-size: 1.6rem;
  }
  .stat-number {
    font-size: 2.2rem;
  }
  .banner-cta {
    padding: 32px 24px;
  }
  .gallery-grid {
    grid-template-columns: 1fr;
  }
  .navbar-inner {
    height: 64px;
  }
}