:root {
  /* 主题色 */
  --seo-color-primary: #111; /* 用深色做主色，白色背景下标题会更清晰 */
  --seo-color-secondary: rgba(0, 0, 0, 0.6);
  --font-family: Roboto, sans-serif;

  /* 背景色：改为白色或柔和的浅灰渐变 */
  --color-background: #fff;
  --color-background-2: #f8f9fa;

  --color-background-side: #fff;

  /* 特别图标颜色 */
  --color-icon-text: #fff;

  /* 字体颜色 */
  --text-heading: var(--seo-color-primary);
  --seo-text-body: var(--seo-color-secondary);

  /* 模块宽度 */
  --container-width: 1190px;

  /* 字体大小 */
  --font-h2: 2.25rem;
  --font-h2-md: 2rem;
  --font-h2-sm: 1.875rem;
  --font-h4: 1.25rem;
  --font-h4-sm: 0.8rem;
  --font-h3: 1.5rem;
  --font-h3-sm: 1.25rem;

  --font-body: 1.125rem;
  --font-body-sm: 1rem;

  --avatar-size: 64px; /* 头像直径，可调整 */
  --avatar-overlap: 20px; /* 叠加量（越大重叠越少）*/
  --star-size: 28px;
  --star-color: #f5a623;
  --text-color: #111;

  --main-primary-color: #115c45;
  --main-secondary-color: #ffffff;
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-light: #999999;
  --background-light: #ffffff;
  --background-dark: #115c45;
  --border-color: #e5e5e5;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.15);
  --border-radius: 12px;
  --transition: all 0.3s ease;
  --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
body {
  background: var(--color-background);
  margin: 0;
  font-family: var(--font-family);
}

.grammar-container {
  background: var(--color-background);

  /* padding: 48px 24px; */
}

.content-row,
.feature-grid,
.scenarios-container,
.scenario-content,
.tutorial-steps,
.testimonials-grid,
.advantages,
.faq-list,
.container-case,
.container-faq {
  max-width: var(--container-width);
  margin: 0 auto;
}

h2 {
  font-size: var(--font-h2);
  font-weight: bold;
  color: var(--seo-color-primary);
  margin: 16px auto;
  line-height: 1.2;
  text-align: center;
}

.h2-description {
  font-size: var(--font-body);
  color: var(--seo-text-body);
  max-width: 768px;
  margin: 32px auto;
  line-height: 1.6;
}

p {
  font-size: var(--font-body);
  color: var(--seo-text-body);
  max-width: 768px;
  margin: 0 auto;
  line-height: 1.6;
  font-weight: normal;
}

h3 {
  font-size: var(--font-h3);
  font-weight: 600;
  color: var(--seo-color-primary);
  margin-bottom: 12px;
}

h4 {
  /* font-size: var(--font-h4); */
  font-weight: 600;
  color: var(--seo-color-primary);
  margin-bottom: 12px;
}

img:hover {
  transform: scale(1.05);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

/* 概览 */

.container-overview,
.container-feature,
.container-feature-2,
.container-benefits,
.container-benefit-2,
.container-tutorial,
.container-testimonials,
.container-faq,
.container-advantages,
.container-scenarios,
.container-case {
  text-align: center;
  padding-top: 75px;
  padding-bottom: 75px;
}

.container-case,
.container-feature-2 {
  padding: 75px 16px 150px;
}

.container-faq {
  padding: 75px 16px;
}

.container-tutorial {
  margin-bottom: 75px;
}

.content-row {
  display: flex;
  align-items: center;
  gap: 48px;
  margin-bottom: 64px;
}

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

.content-item {
  flex: 1;
}

.content-item img {
  width: 100%;
  height: auto;
  border-radius: 8px;
}

.text-content {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* 功能-样式1 */

.container-feature .header-section .container-feature .header-section p {
  font-size: var(--font-body);
  color: var(--seo-color-primary);
  max-width: 768px;
  margin: 0 auto 48px auto;
  line-height: 1.6;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr); /* 只显示两列 */
  gap: 32px;
  justify-items: center; /* 水平居中 */
}

.feature-card {
  background: var(--color-background-side);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 24px;
  text-align: left;
  transition: box-shadow 0.3s ease;
  width: 579px;
  box-sizing: border-box;
}

.feature-card-last {
  grid-column: 1 / -1; /* 第三个卡片独占一行 */
  justify-self: center; /* 自身居中 */
  width: var(--container-width);
  box-sizing: border-box;
  display: flex;
  align-items: center;
}

.feature-card:hover {
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.feature-card img {
  width: 100%;
  height: auto;
  margin-bottom: 16px;
  border-radius: 8px;
}

.feature-card-last img {
  width: 50%;
  margin-right: 30px;
  margin-bottom: 0px;
}

.feature-card-last h3 {
  margin-top: 0px;
}

/* 功能-样式2 */

.container-feature-2 {
  text-align: center;
}
.container-feature-2 .feature-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 20px;
}
.container-feature-2 .feature-card {
  width: 32%;
}

/* 优势样式1 */

.benefits-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-sizing: border-box;
  padding: 0px 20px;
  padding-top: 30px;
}

.benefits-header .right-image {
  width: 50%;
}

.right-image img {
  width: 100%;
  height: auto;
}

.benefits-content {
  display: flex;
  gap: 15px;
  margin-top: 32px;
  justify-content: space-between;
}

.benefit-item {
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 24px;
  box-sizing: border-box;
  min-width: 24%;
}

.benefit-item:hover {
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

/* 优势样式2 */
.container-benefit-2 {
  display: flex;
  gap: 2rem; /* 左右区块间距 */
  padding: 2rem;
  align-items: center;
}

.container-benefit-2 .h2-description {
  max-width: none;
}

.container-benefit-2 .right-section {
  flex: 1 1 600px; /* 弹性收缩/扩展，最小宽度600px */
  display: grid;
  grid-template-columns: repeat(3, 1fr); /* 固定3列等宽 */
  grid-gap: 1rem; /* 网格项间距 */
}
/* 单个卡片样式 */
.container-benefit-2 .right-section .benefit-card {
  display: flex;
  flex-direction: column; /* SVG在上，标题在下 */
  align-items: center; /* 水平居中 */
  text-align: center; /* 文字居中 */
  padding: 1.25rem;
  background-color: var(--color-background-side);
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s ease; /*  hover 动画（可选） */
}
.container-benefit-2 .right-section .benefit-card:hover {
  transform: translateY(-4px);
}

/* 优势样式3 */

.advantages {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin: 4rem auto;
}

.advantage {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--color-background-side);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  border-radius: 15px;
  padding: 1.5rem;
  border: var(--color-background-side);
}

.advantage:hover {
  box-shadow: 0 2px 4px rgba(17, 92, 69, 0.4), 0 6px 12px rgba(17, 92, 69, 0.08);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.advantage-icon {
  width: 50px;
  height: 50px;
  /* background: var(--color-icon); */
  color: var(--color-icon-text);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.advantage-icon svg {
  width: 30px;
  height: 30px;
}

/* 教程-样式2 */

/* 教程板块 */
/* 教程板块 */
.container-tutorial {
  padding: 100px 0;
}

.tutorial-steps {
  display: flex;
  flex-direction: column;
  gap: 80px;
}

.tutorial-steps-button .button {
  background: #fff;
  color: #115c45;
  border-radius: 10px;
  padding: 10px 20px;
  font-size: 21px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s ease;
}

.tutorial-steps-button .button:hover {
  transform: scale(1.05);
}

.step-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 60px;
  align-items: center;
}

.step-number {
  width: 80px;
  height: 80px;
  background: #fff;
  border-radius: 50%;
  color: #115c45;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: bold;
  position: relative;
}

.step-title {
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: white;
  text-align: left;
}

.step-description {
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.6;
  text-align: left;
}

.step-visual {
  width: auto;
  height: 250px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.typing-cursor {
  width: 2px;
  height: 30px;
  background: white;
  animation: blink 1s infinite;
}

.highlight-animation {
  width: 80px;
  height: 20px;
  background: rgba(255, 193, 7, 0.6);
  border-radius: 4px;
  animation: highlight 2s infinite;
}

.fix-animation {
  width: 60px;
  height: 60px;
  border: 3px solid white;
  border-radius: 50%;
  border-top-color: transparent;
  animation: spin 1s linear infinite;
}

.dark-bg {
  background: #115c45;
  color: white;
}

.dark-bg .section-title {
  color: white;
}

.dark-bg .section-description {
  color: rgba(255, 255, 255, 0.8);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* 场景样式一 */

/* 主体布局：左边三块 + 右边一块 */

.container-case h2 {
  margin-bottom: 20px;
}

.case-layout {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1.5rem;
}

/* 左边垂直排列 */
.case-left {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* 卡片样式 */
.case-card {
  border-radius: 12px;
  padding: 1.5rem;
  box-sizing: border-box;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  border: 1px solid #e5e7eb;
}

.case-card:hover {
  /* transform: translateY(-4px); */
  box-shadow: 0 2px 4px rgba(17, 92, 69, 0.4), 0 6px 12px rgba(17, 92, 69, 0.08);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.case-card .icon {
  margin-bottom: 1rem;
  color: #115c45;
}

.case-card h3 {
  /* font-size: 1.25rem; */
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: #0a0e1a;
}

.case-card p {
  /* font-size: 0.95rem; */
  line-height: 1.6;
  color: #333;
}

/* 背景色 */
.case-card.leftOne,
.case-card.leftThree {
  background: #fff;
}

.case-card.leftTwo {
  color: #fff !important;
  background: #115c45;
}

.leftTwo .icon {
  color: #fff;
}

.case-card.leftTwo h3,
.case-card.leftTwo p {
  color: #fff !important;
}

.case-right {
  display: flex;
  flex-direction: column;
  align-items: center;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  height: 100%;
  justify-content: center;
}

.case-right:hover {
  box-shadow: 0 2px 4px rgba(17, 92, 69, 0.4), 0 6px 12px rgba(17, 92, 69, 0.08);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.case-card.rightOne {
  background: #fff;
  box-shadow: none;
  border: none;
}

/* 移动端适配 */
@media (max-width: 992px) {
  .case-layout {
    grid-template-columns: 1fr;
  }

  .case-right {
    margin-top: 1.5rem;
  }

  .case-card.rightOne {
    height: auto;
  }
}

/* 用户评价样式1 */

.container-testimonials {
  background: #115c45;
}

.container-testimonials h2 {
  color: #fff;
}

.testimonials-grid {
  display: grid;
  /* grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); */
  gap: 2rem;
  margin-top: 3rem;
}

.testimonial-card {
  background: var(--color-background-side);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  border-radius: 1rem;
  padding: 2rem;
  border: var(--color-background-side);
  box-shadow: 0 4px 20px rgba(0, 0, 255, 0.08);
  position: relative;
}

.testimonial-text {
  color: var(--seo-text-body);
  max-width: fit-content;
  font-style: italic;
  margin: 0px;
  margin-bottom: 1.5rem;
  line-height: 1.7;
  text-align: left;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.author-avatar {
  width: 50px;
  height: 50px;
  background: #115c45;
  color: var(--color-icon-text);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 1.125rem;
}

.author-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
}

.author-info h4 {
  font-weight: 600;
  margin: 0;
  text-align: left;
}

.author-info p {
  color: var(--seo-text-body);
  font-size: 0.875rem;
}

/* 头像部分样式 */
.rating-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  padding: 20px;
}

/* 头像组 */
.avatar-stack {
  position: relative;
  height: var(--avatar-size);
  /* reserve space equal to avatars minus overlap */
  width: calc(var(--avatar-size) + 2 * (var(--avatar-size) - var(--avatar-overlap)));
  /* 如果你不想固定宽度可以移除上面 width */
}

.avatar-stack img {
  position: absolute;
  width: var(--avatar-size);
  height: var(--avatar-size);
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.12);
  border: 3px solid #fff; /* 白色边框，让头像更分明 */
  top: 0;
}
/* 控制每个头像的水平位置与层级（显示从左到右） */
.avatar-stack img:nth-child(1) {
  left: 0px;
  z-index: 3;
}
.avatar-stack img:nth-child(2) {
  left: calc(var(--avatar-size) - var(--avatar-overlap));
  z-index: 2;
}
.avatar-stack img:nth-child(3) {
  left: calc(2 * (var(--avatar-size) - var(--avatar-overlap)));
  z-index: 1;
}

/* 如果需要 +N 圆点（未展示的头像数量），可以使用 .avatar-more（示例在注释里） */

/* 星级与评分 */
.rating-info {
  display: flex;
  align-items: center;
  gap: 12px;
}
.stars {
  display: flex;
  align-items: center;
  gap: 6px;
}
.star {
  width: var(--star-size);
  height: var(--star-size);
  display: inline-block;
  line-height: 0;
}
.rating-text {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
}
.rating-sub {
  font-size: 14px;
  color: #fff;
  margin-left: 8px;
  font-weight: 500;
}

/* 常见问题样式2 */
/* FAQ */
.faq-item {
  background: #fff;
  margin-bottom: 1rem;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(17, 92, 69, 0.4), 0 6px 12px rgba(17, 92, 69, 0.08);
}

.faq-question {
  padding: 1.5rem;
  cursor: pointer;
  font-size: 1.25rem;
  font-weight: 600;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-answer {
  padding: 0 1.5rem 1.5rem;
  color: #6c757d;
  display: none;
}

.faq-answer p {
  font-size: 1rem;
  max-width: none;
  text-align: left;
}

.faq-answer.active {
  display: block;
}

/* 响应式设计 */
@media (max-width: 1024px) {
  .content-row,
  .content-row.reverse {
    flex-direction: column;
    gap: 32px;
  }

  .container {
    padding: 32px 16px;
  }

  h2 {
    font-size: var(--font-h2-md);
  }

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

  /* 功能-样式1 */

  .feature-grid {
    display: flex;
    flex-direction: column;
    gap: 32px;
    justify-items: center; /* 水平居中 */
  }

  .feature-card,
  .feature-card-last {
    width: 100%;
  }
  .feature-card-last {
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
  }

  .feature-card img {
    width: 100%;
    height: auto;
    margin-bottom: 16px;
    border-radius: 8px;
  }
  /* 功能-样式2 */

  .container-feature-2 .feature-card {
    width: 100%;
  }

  /* 教程样式2 */
  .step-number {
    width: 40px;
    height: 40px;
  }

  .step-item {
    grid-template-columns: auto 1fr;
  }

  .step-visual {
    grid-column: 1 / -1;
    height: auto;
    width: 100%;
  }
}

@media (max-width: 768px) {
  h2 {
    font-size: var(--font-h2-sm);
    max-width: 90%;
  }

  .h2-description {
    max-width: 90%;
  }

  p {
    font-size: var(--font-body-sm);
  }

  h3 {
    font-size: var(--font-h3-sm);
  }

  h4 {
    font-size: var(--font-h4-sm);
  }

  .content-row,
  .feature-grid,
  .scenarios-container,
  .scenario-content,
  .tutorial-steps,
  .testimonials-grid,
  .advantages,
  .faq-list {
    padding: 0px 16px;
  }

  .content-row .content-item:first-child {
    order: 1;
  }

  .tab-item h3 {
    font-size: var(--font-h4-sm);
  }

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

  .step-title {
    font-size: var(--font-h3-sm);
  }

  /* 优势样式1 */

  .benefits-header,
  .header-section,
  .benefits-content {
    display: flex;
    flex-direction: column;
  }
  .benefit-item {
    width: 100%;
  }

  /* 优势样式2 */
  .container-benefit-2 {
    flex-direction: column;
  }

  /* 优势样式3 */
  .advantages {
    grid-template-columns: 1fr;
  }
  .advantage p {
    text-align: left;
  }

  /* 场景切换 */
  .scenario-tabs {
    display: flex;
    width: 100%;
  }
  .scenario-tabs .tab-item {
    width: 30%;
    box-sizing: border-box;
    padding: 5px;
  }
  .scenario-panel {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding: 0.5rem;
  }

  /* 用户评价样式1 */
  .rating-row {
    flex-direction: column;
  }
}