/* ===========================================
   鸡蛋壳 - 全局样式
   设计说明：纯净配色，无渐变，响应式布局
   =========================================== */

:root {
  --color-bg: #fff8e7;          /* 蛋壳米白 */
  --color-bg-alt: #fdf2d2;      /* 浅蛋黄 */
  --color-card: #ffffff;
  --color-primary: #e6a23c;     /* 蛋黄橙 */
  --color-primary-dark: #c98421;
  --color-secondary: #8b5a2b;   /* 深棕（蛋壳斑纹） */
  --color-accent: #5d8a4c;      /* 自然绿 */
  --color-text: #2c2418;
  --color-text-light: #6b5b45;
  --color-border: #e8d8b0;
  --color-danger: #c0392b;
  --shadow-sm: 0 2px 6px rgba(70, 50, 20, 0.08);
  --shadow-md: 0 6px 18px rgba(70, 50, 20, 0.12);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --max-width: 1200px;
  --transition: 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB",
    "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

a:hover {
  color: var(--color-secondary);
}

/* ============== 通用容器 ============== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 60px 0;
}

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

.section-title {
  text-align: center;
  font-size: 2rem;
  color: var(--color-secondary);
  margin-bottom: 12px;
  position: relative;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-light);
  margin-bottom: 40px;
  font-size: 1.05rem;
}

.section-title::after {
  content: "";
  display: block;
  width: 60px;
  height: 3px;
  background-color: var(--color-primary);
  margin: 12px auto 0;
  border-radius: 2px;
}

/* ============== 顶部导航 ============== */
.site-header {
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--color-secondary);
}

.logo-icon {
  width: 38px;
  height: 46px;
  background-color: var(--color-bg-alt);
  border: 2px solid var(--color-primary);
  border-radius: 50% 50% 48% 48% / 60% 60% 40% 40%;
  position: relative;
  display: inline-block;
}

.logo-icon::before,
.logo-icon::after {
  content: "";
  position: absolute;
  background-color: var(--color-secondary);
  border-radius: 50%;
}

.logo-icon::before {
  width: 5px;
  height: 5px;
  top: 12px;
  left: 8px;
}

.logo-icon::after {
  width: 4px;
  height: 4px;
  top: 22px;
  right: 9px;
}

.nav-list {
  list-style: none;
  display: flex;
  gap: 6px;
}

.nav-list a {
  display: block;
  padding: 8px 14px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  font-weight: 500;
  transition: background-color var(--transition), color var(--transition);
}

.nav-list a:hover,
.nav-list a.active {
  background-color: var(--color-bg-alt);
  color: var(--color-primary-dark);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background-color: var(--color-secondary);
  transition: transform var(--transition), opacity var(--transition);
  transform-origin: center;
}

/* 默认隐藏的导航遮罩层，仅在移动端开启 */
.nav-overlay {
  display: none;
}

/* ============== 首页 Hero ============== */
.hero {
  background-color: var(--color-bg-alt);
  padding: 80px 0 90px;
  border-bottom: 1px solid var(--color-border);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 50px;
  align-items: center;
}

.hero h1 {
  font-size: 2.6rem;
  line-height: 1.3;
  color: var(--color-secondary);
  margin-bottom: 20px;
}

.hero h1 .accent {
  color: var(--color-primary-dark);
}

.hero p.lead {
  font-size: 1.1rem;
  color: var(--color-text-light);
  margin-bottom: 28px;
}

.hero-buttons {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition),
    border-color var(--transition), transform var(--transition);
}

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

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

.btn-outline {
  background-color: transparent;
  color: var(--color-secondary);
  border-color: var(--color-secondary);
}

.btn-outline:hover {
  background-color: var(--color-secondary);
  color: #fff;
}

/* Hero illustration: stylized egg */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.egg-illustration {
  width: 260px;
  height: 340px;
  background-color: #fff;
  border: 4px solid var(--color-primary);
  border-radius: 50% 50% 48% 48% / 60% 60% 40% 40%;
  position: relative;
  box-shadow: var(--shadow-md);
}

.egg-illustration .spot {
  position: absolute;
  background-color: var(--color-secondary);
  opacity: 0.55;
  border-radius: 50%;
}

.egg-illustration .spot.s1 { width: 18px; height: 18px; top: 60px; left: 50px; }
.egg-illustration .spot.s2 { width: 10px; height: 10px; top: 110px; right: 60px; }
.egg-illustration .spot.s3 { width: 22px; height: 22px; top: 170px; left: 80px; }
.egg-illustration .spot.s4 { width: 8px; height: 8px; top: 230px; right: 90px; }
.egg-illustration .spot.s5 { width: 14px; height: 14px; top: 260px; left: 110px; }

/* ============== 卡片 / 网格 ============== */
.grid {
  display: grid;
  gap: 24px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.card .card-icon {
  width: 52px;
  height: 52px;
  background-color: var(--color-bg-alt);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 1.6rem;
  color: var(--color-primary-dark);
  border: 2px solid var(--color-primary);
}

.card h3 {
  color: var(--color-secondary);
  margin-bottom: 10px;
  font-size: 1.2rem;
}

.card p {
  color: var(--color-text-light);
  font-size: 0.96rem;
}

/* ============== 内页头部 ============== */
.page-header {
  background-color: var(--color-bg-alt);
  padding: 60px 0;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  font-size: 2.2rem;
  color: var(--color-secondary);
  margin-bottom: 10px;
}

.page-header p {
  color: var(--color-text-light);
  font-size: 1.05rem;
  max-width: 720px;
  margin: 0 auto;
}

/* ============== 文章/段落 ============== */
.prose {
  max-width: 880px;
  margin: 0 auto;
}

.prose h2 {
  color: var(--color-secondary);
  font-size: 1.6rem;
  margin: 36px 0 14px;
  padding-left: 14px;
  border-left: 5px solid var(--color-primary);
}

.prose h3 {
  color: var(--color-primary-dark);
  font-size: 1.2rem;
  margin: 24px 0 10px;
}

.prose p {
  margin-bottom: 14px;
  color: var(--color-text);
}

.prose ul,
.prose ol {
  margin: 10px 0 18px 24px;
  color: var(--color-text);
}

.prose ul li,
.prose ol li {
  margin-bottom: 8px;
}

.prose blockquote {
  border-left: 4px solid var(--color-accent);
  background-color: var(--color-bg-alt);
  padding: 14px 18px;
  margin: 18px 0;
  color: var(--color-text-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* ============== 数据表 ============== */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0 24px;
  background-color: var(--color-card);
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.data-table th,
.data-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.data-table th {
  background-color: var(--color-bg-alt);
  color: var(--color-secondary);
  font-weight: 600;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table tr:hover td {
  background-color: var(--color-bg);
}

/* ============== 步骤 ============== */
.steps {
  counter-reset: step;
  display: grid;
  gap: 16px;
}

.step {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-left: 5px solid var(--color-primary);
  padding: 18px 22px;
  border-radius: var(--radius-sm);
  position: relative;
  padding-left: 64px;
}

.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.step h4 {
  color: var(--color-secondary);
  margin-bottom: 4px;
}

.step p {
  color: var(--color-text-light);
  font-size: 0.95rem;
}

/* ============== FAQ ============== */
.faq-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-item summary {
  padding: 16px 20px;
  cursor: pointer;
  font-weight: 600;
  color: var(--color-secondary);
  list-style: none;
  position: relative;
  padding-right: 44px;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  color: var(--color-primary);
  transition: transform var(--transition);
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item .faq-body {
  padding: 0 20px 18px;
  color: var(--color-text-light);
}

/* ============== 标签 ============== */
.tag {
  display: inline-block;
  padding: 4px 10px;
  background-color: var(--color-bg-alt);
  color: var(--color-secondary);
  border-radius: 999px;
  font-size: 0.85rem;
  margin: 0 6px 6px 0;
  border: 1px solid var(--color-border);
}

.tag.green { color: var(--color-accent); border-color: var(--color-accent); background-color: #eef5e8; }
.tag.orange { color: var(--color-primary-dark); border-color: var(--color-primary); background-color: #fdf2d2; }

/* ============== 数据展示 ============== */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin: 30px 0;
}

.stat-box {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-align: center;
  padding: 24px 16px;
}

.stat-box .num {
  font-size: 2rem;
  color: var(--color-primary-dark);
  font-weight: 700;
  display: block;
}

.stat-box .label {
  color: var(--color-text-light);
  font-size: 0.95rem;
}

/* ============== 行动召唤 ============== */
.cta {
  background-color: var(--color-secondary);
  color: #fff;
  padding: 50px 0;
  text-align: center;
}

.cta h2 {
  font-size: 1.8rem;
  margin-bottom: 12px;
  color: #fff;
}

.cta p {
  margin-bottom: 22px;
  opacity: 0.92;
}

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

.cta .btn-outline {
  color: #fff;
  border-color: #fff;
}

.cta .btn-outline:hover {
  background-color: #fff;
  color: var(--color-secondary);
}

/* ============== 页脚 ============== */
.site-footer {
  background-color: #2c2418;
  color: #d8c9a8;
  padding: 50px 0 0;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 30px;
  padding-bottom: 30px;
  border-bottom: 1px solid #4a3d2a;
}

.footer-col h4 {
  color: #fff;
  margin-bottom: 14px;
  font-size: 1.05rem;
}

.footer-col p,
.footer-col a {
  color: #b9a983;
  font-size: 0.94rem;
  display: block;
  margin-bottom: 8px;
}

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

.footer-bottom {
  text-align: center;
  padding: 20px 0;
  font-size: 0.9rem;
  color: #a39473;
}

.footer-bottom a {
  color: #d8c9a8;
  margin: 0 6px;
}

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

/* ============== 回到顶部 ============== */
.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 30px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
  z-index: 99;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-3px);
}

/* ============== 动画 ============== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============== 响应式 ============== */
@media (max-width: 992px) {
  .hero-inner { grid-template-columns: 1fr; text-align: center; }
  .hero-visual { order: -1; }
  .egg-illustration { width: 200px; height: 260px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  .section { padding: 44px 0; }
  .section-title { font-size: 1.6rem; }
  .hero { padding: 50px 0 60px; }
  .hero h1 { font-size: 1.9rem; }
  .page-header h1 { font-size: 1.7rem; }

  .nav-toggle { display: flex; position: relative; z-index: 130; }

  /* 遵从请求：移动端导航采用从右侧滑入的抽屉式面板 */
  .nav-list {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 78%;
    max-width: 320px;
    background-color: var(--color-card);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    padding: 84px 22px 24px;
    gap: 6px;
    border-left: 1px solid var(--color-border);
    box-shadow: -8px 0 24px rgba(70, 50, 20, 0.18);
    transform: translateX(110%);
    transition: transform 0.32s ease;
    z-index: 120;
    overflow-y: auto;
  }
  .nav-list.open { transform: translateX(0); }
  .nav-list a {
    padding: 14px 16px;
    border-bottom: 1px solid var(--color-border);
    border-radius: 0;
  }
  .nav-list li:last-child a { border-bottom: none; }

  /* 遮罩层 */
  .nav-overlay {
    display: block;
    position: fixed;
    inset: 0;
    background-color: rgba(44, 36, 24, 0.45);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 110;
  }
  .nav-overlay.open {
    opacity: 1;
    pointer-events: auto;
  }

  /* 汉堡点击后变为“×” */
  .nav-toggle.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .nav-toggle.open span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  body.nav-open { overflow: hidden; }

  .grid-2,
  .grid-3,
  .grid-4 { grid-template-columns: 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .hero-buttons { justify-content: center; }
}

@media (max-width: 480px) {
  body { font-size: 15px; }
  .stats { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { font-size: 0.82rem; }
  .step { padding-left: 56px; }
}