/* ============================================
   征途国际 — 征途万里，链通世界
   设计主题：暖沙赤陶 · 有机现代主义
   配色：奶油白 + 赤陶色 + 橄榄绿 + 金盏黄
   ============================================ */

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

:root {
  --cream: #FBFAF5;
  --warm-sand: #F3EEE4;
  --terracotta: #C75B3A;
  --terracotta-dark: #A8492D;
  --terracotta-light: #F0D5C9;
  --olive: #5C6B4A;
  --olive-light: #E9EDE2;
  --marigold: #F0A04B;
  --marigold-light: #FEF3E4;
  --brown-deep: #3D2B1F;
  --brown-soft: #7A6B5D;
  --brown-muted: #B8A394;
  --footer-bg: #E7DACB;
  --card-border: #E8DDD0;
  --shadow-warm: 0 4px 20px rgba(61, 43, 31, 0.08);
  --shadow-hover: 0 8px 32px rgba(61, 43, 31, 0.13);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x: hidden;
  background: var(--cream);
  color: var(--brown-deep);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 核心布局 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
  position: relative;
}

.section:nth-child(even) {
  background: var(--warm-sand);
}

/* 导航 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(251, 250, 245, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(184, 163, 148, 0.3);
  transition: box-shadow var(--transition);
}

.site-header.scrolled {
  box-shadow: 0 2px 24px rgba(61, 43, 31, 0.07);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  text-decoration: none;
  color: var(--brown-deep);
  letter-spacing: -0.02em;
  transition: opacity var(--transition);
}

.logo:hover {
  opacity: 0.8;
}

.logo-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  background: linear-gradient(135deg, var(--terracotta), var(--marigold));
  color: #fff;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.main-nav a {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--brown-soft);
  transition: color var(--transition);
  position: relative;
  letter-spacing: 0.01em;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--terracotta);
  border-radius: 1px;
  transition: width var(--transition);
}

.main-nav a:hover {
  color: var(--terracotta);
}

.main-nav a:hover::after {
  width: 100%;
}

.nav-cta {
  padding: 10px 22px;
  border-radius: 25px;
  color: #fff !important;
  font-weight: 600;
  background: var(--terracotta);
  letter-spacing: 0.02em;
  transition: all var(--transition) !important;
  box-shadow: 0 4px 14px rgba(199, 91, 58, 0.25);
}

.nav-cta:hover {
  background: var(--terracotta-dark);
  box-shadow: 0 6px 20px rgba(199, 91, 58, 0.35);
  transform: translateY(-1px);
}

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

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
  z-index: 1001;
}

.menu-toggle span {
  display: block;
  width: 26px;
  height: 2.5px;
  background: var(--brown-deep);
  border-radius: 2px;
  transition: all var(--transition);
  transform-origin: center;
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Hero */
.hero {
  min-height: 70vh;
  display: flex;
  align-items: center;
  padding-top: 68px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -120px;
  right: -180px;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(240, 160, 75, 0.12) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -80px;
  left: -100px;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(92, 107, 74, 0.08) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.hero .container {
  display: flex;
  align-items: center;
  gap: 56px;
  position: relative;
  z-index: 1;
  width: 100%;
}

.hero-content {
  max-width: 720px;
  flex: 1;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 18px;
  background: var(--terracotta-light);
  color: var(--terracotta);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hero h1 {
  font-size: 3.4rem;
  line-height: 1.15;
  margin-bottom: 22px;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--brown-deep);
}

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

.hero p {
  font-size: 1.15rem;
  opacity: 0.75;
  max-width: 560px;
  margin-bottom: 34px;
  color: var(--brown-soft);
  line-height: 1.7;
}

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

.hero-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  flex: 0 0 420px;
  box-shadow: var(--shadow-warm);
  transform: rotate(0.5deg);
  transition: transform var(--transition), box-shadow var(--transition);
}

.hero-image:hover {
  transform: rotate(0deg) scale(1.02);
  box-shadow: var(--shadow-hover);
}

.hero-image img {
  width: 100%;
  height: auto;
  display: block;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: 25px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: all var(--transition);
  font-size: 0.95rem;
  letter-spacing: 0.01em;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s ease, height 0.6s ease;
}

.btn:active::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  color: #fff;
  background: var(--terracotta);
  box-shadow: 0 4px 16px rgba(199, 91, 58, 0.3);
}

.btn-primary:hover {
  background: var(--terracotta-dark);
  box-shadow: 0 6px 24px rgba(199, 91, 58, 0.4);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  border: 1.8px solid var(--terracotta);
  color: var(--terracotta);
}

.btn-outline:hover {
  background: var(--terracotta-light);
  border-color: var(--terracotta-dark);
  color: var(--terracotta-dark);
  transform: translateY(-2px);
}

/* 标签/标题 */
.section-label {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 2.5px;
  margin-bottom: 14px;
  color: var(--terracotta);
  text-transform: uppercase;
}

.section-title {
  font-size: 2.2rem;
  margin-bottom: 16px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--brown-deep);
  line-height: 1.25;
}

.section-desc {
  max-width: 600px;
  opacity: 0.7;
  margin-bottom: 44px;
  color: var(--brown-soft);
  font-size: 1.05rem;
  line-height: 1.65;
}

/* 卡片网格 */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.category-card {
  border-radius: var(--radius-lg);
  padding: 30px;
  border: 1px solid var(--card-border);
  transition: all var(--transition);
  background: #fff;
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.category-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--terracotta), var(--marigold));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

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

.category-card:hover::after {
  transform: scaleX(1);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  font-size: 1.4rem;
  background: var(--marigold-light);
  color: var(--marigold);
  transition: all var(--transition);
}

.category-card:hover .card-icon {
  background: var(--terracotta-light);
  color: var(--terracotta);
  transform: scale(1.08);
}

.category-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--brown-deep);
  letter-spacing: -0.01em;
}

.category-card p {
  font-size: 0.9rem;
  color: var(--brown-soft);
  line-height: 1.55;
  margin-bottom: 16px;
}

.card-link {
  font-weight: 600;
  font-size: 0.85rem;
  text-decoration: none;
  color: var(--terracotta);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap var(--transition);
}

.card-link:hover {
  gap: 10px;
  color: var(--terracotta-dark);
}

/* 特性块 */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.feature-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-warm);
  position: relative;
}

.feature-image::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  border: 3px solid rgba(199, 91, 58, 0.1);
  pointer-events: none;
  z-index: 1;
}

.feature-image img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.5s ease;
}

.feature-image:hover img {
  transform: scale(1.04);
}

.feature-text h3 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--brown-deep);
  letter-spacing: -0.02em;
}

.feature-text p {
  color: var(--brown-soft);
  margin-bottom: 20px;
  line-height: 1.65;
}

.feature-list {
  list-style: none;
}

.feature-list li {
  padding: 8px 0;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--brown-deep);
  font-weight: 500;
  font-size: 0.95rem;
}

.feature-list li::before {
  content: '✓';
  font-weight: 700;
  color: var(--olive);
  background: var(--olive-light);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  flex-shrink: 0;
}

/* 数据条 */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item {
  padding: 28px 20px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--card-border);
  background: #fff;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.stat-item::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 3px;
  border-radius: 2px;
  background: var(--terracotta);
  transition: width var(--transition);
}

.stat-item:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.stat-item:hover::before {
  width: 60px;
}

.stat-number {
  font-size: 2.6rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--terracotta), var(--marigold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
}

.stat-label {
  font-size: 0.9rem;
  opacity: 0.65;
  margin-top: 8px;
  color: var(--brown-soft);
  font-weight: 500;
}

/* 内容墙 */
.content-wall {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.content-wall-item {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--card-border);
  transition: all var(--transition);
  background: #fff;
}

.content-wall-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: transparent;
}

.content-wall-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.content-wall-item:hover img {
  transform: scale(1.06);
}

.content-wall-body {
  padding: 22px;
}

.content-wall-body h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--brown-deep);
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.content-wall-body p {
  font-size: 0.88rem;
  color: var(--brown-soft);
  line-height: 1.5;
}

.content-wall-body .date {
  font-size: 0.78rem;
  color: var(--brown-muted);
  margin-bottom: 8px;
  display: block;
}

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

.faq-item {
  border: 1px solid var(--card-border);
  border-radius: 12px;
  margin-bottom: 10px;
  overflow: hidden;
  cursor: pointer;
  background: #fff;
  transition: all var(--transition);
}

.faq-item:hover {
  border-color: var(--terracotta-light);
  box-shadow: 0 2px 12px rgba(61, 43, 31, 0.05);
}

.faq-item .faq-question {
  padding: 18px 22px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--brown-deep);
  font-size: 0.98rem;
  letter-spacing: -0.01em;
  user-select: none;
  transition: color var(--transition);
}

.faq-item .faq-question::after {
  content: '+';
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--terracotta);
  transition: transform var(--transition);
  flex-shrink: 0;
  margin-left: 16px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--terracotta-light);
}

.faq-item .faq-answer {
  padding: 0 22px 18px;
  display: none;
  opacity: 0.7;
  color: var(--brown-soft);
  line-height: 1.6;
  font-size: 0.9rem;
}

.faq-item.open {
  border-color: var(--terracotta-light);
  box-shadow: 0 4px 16px rgba(199, 91, 58, 0.08);
}

.faq-item.open .faq-question {
  color: var(--terracotta);
}

.faq-item.open .faq-question::after {
  content: '−';
  background: var(--terracotta);
  color: #fff;
  transform: rotate(180deg);
}

.faq-item.open .faq-answer {
  display: block;
}

/* CTA横幅 */
.cta-banner {
  padding: 60px 32px;
  text-align: center;
  border-radius: var(--radius-xl);
  color: #fff;
  background: linear-gradient(135deg, var(--terracotta) 0%, #D4724F 30%, var(--marigold) 100%);
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -60px;
  right: -80px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  pointer-events: none;
}

.cta-banner::after {
  content: '';
  position: absolute;
  bottom: -40px;
  left: -40px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.04);
  pointer-events: none;
}

.cta-banner h2 {
  color: #fff;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  position: relative;
  z-index: 1;
}

.cta-banner p {
  color: rgba(255, 255, 255, 0.85);
  margin: 14px auto 28px;
  max-width: 500px;
  position: relative;
  z-index: 1;
  font-size: 1.05rem;
  line-height: 1.6;
}

.cta-banner .btn-primary {
  background: #fff;
  color: var(--terracotta);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.12);
  position: relative;
  z-index: 1;
  font-weight: 700;
}

.cta-banner .btn-primary:hover {
  background: #fff;
  color: var(--terracotta-dark);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.18);
  transform: translateY(-2px);
}

/* 页脚 */
.site-footer {
  padding: 56px 0 28px;
  background: var(--footer-bg);
  color: var(--brown-deep);
}

.site-footer .container {
  position: relative;
}

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

.footer-brand {
  max-width: 280px;
}

.footer-brand .logo {
  margin-bottom: 14px;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--brown-soft);
  line-height: 1.6;
}

.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--brown-deep);
  letter-spacing: 0.02em;
}

.footer-col ul {
  list-style: none;
}

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

.footer-col ul li a {
  text-decoration: none;
  font-size: 0.88rem;
  color: var(--brown-soft);
  transition: color var(--transition);
}

.footer-col ul li a:hover {
  color: var(--terracotta);
}

.footer-bottom {
  border-top: 1px solid rgba(61, 43, 31, 0.1);
  margin-top: 40px;
  padding-top: 20px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--brown-muted);
}

/* 工具类 */
.text-accent {
  color: var(--terracotta);
}

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

.seo-description {
  max-width: 600px;
  margin: 0 auto 48px;
  opacity: 0.7;
  color: var(--brown-soft);
  line-height: 1.65;
}

.mt-0 {
  margin-top: 0;
}

.mb-0 {
  margin-bottom: 0;
}

/* 额外装饰：背景纹理点 */
.section::before {
  content: '';
  position: absolute;
  top: 20px;
  right: 30px;
  width: 80px;
  height: 80px;
  background: radial-gradient(circle, rgba(240, 160, 75, 0.06) 1px, transparent 1px);
  background-size: 12px 12px;
  pointer-events: none;
  z-index: 0;
  border-radius: 50%;
}

.section:nth-child(even)::before {
  background: radial-gradient(circle, rgba(199, 91, 58, 0.05) 1px, transparent 1px);
  background-size: 12px 12px;
}

/* 响应式 */
@media (max-width: 1024px) {
  .hero .container {
    flex-direction: column;
    gap: 40px;
    text-align: center;
  }

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

  .hero p {
    max-width: 100%;
    margin-left: auto;
    margin-right: auto;
  }

  .hero-buttons {
    justify-content: center;
  }

  .hero-image {
    flex: 0 0 auto;
    max-width: 480px;
    width: 100%;
  }

  .hero h1 {
    font-size: 2.6rem;
  }

  .feature-block {
    gap: 36px;
  }

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

  .footer-brand {
    max-width: 100%;
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  .feature-block {
    grid-template-columns: 1fr;
  }

  .feature-image {
    order: -1;
  }

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

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

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

  .hero {
    min-height: 60vh;
  }

  .section {
    padding: 56px 0;
  }

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

  .main-nav {
    display: none;
    position: absolute;
    top: 68px;
    left: 0;
    width: 100%;
    background: rgba(251, 250, 245, 0.98);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    padding: 24px;
    flex-direction: column;
    gap: 8px;
    border-bottom: 1px solid var(--card-border);
    box-shadow: 0 8px 24px rgba(61, 43, 31, 0.06);
    z-index: 999;
  }

  .main-nav.open {
    display: flex;
  }

  .main-nav a {
    padding: 12px 8px;
    font-size: 1rem;
    display: block;
    width: 100%;
  }

  .nav-cta {
    display: inline-block;
    text-align: center;
    margin-top: 8px;
  }

  .menu-toggle {
    display: flex;
  }

  .cta-banner {
    padding: 44px 20px;
    border-radius: var(--radius-lg);
  }

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

@media (max-width: 480px) {
  .cards-grid,
  .content-wall,
  .stats-bar {
    grid-template-columns: 1fr;
  }

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

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

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

  .hero {
    min-height: 50vh;
  }

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

  .container {
    padding: 0 16px;
  }

  .header-inner {
    padding: 0 16px;
  }

  .section-title {
    font-size: 1.45rem;
  }

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

  .btn {
    padding: 12px 24px;
    font-size: 0.9rem;
  }

  .category-card {
    padding: 22px;
  }

  .faq-item .faq-question {
    padding: 14px 16px;
    font-size: 0.9rem;
  }

  .faq-item .faq-answer {
    padding: 0 16px 14px;
  }

  .cta-banner {
    padding: 36px 16px;
  }
}