:root {
    --bg-color: #fdfaf8;
    --surface-color: #ffffff;
    --text-main: #2d2422;
    --text-sub: #6b5c58;
    --brand-color: #c43b3b;
    --brand-hover: #a12c2c;
    --border-color: #ebdcd8;
    --radius-card: 16px;
    --radius-btn: 24px;
    --shadow-soft: 0 8px 24px rgba(196, 59, 59, 0.08);
    --shadow-hover: 0 12px 32px rgba(196, 59, 59, 0.15);
  }

  * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
  }

  body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
  }

  h1, h2, h3 {
    font-weight: 700;
    line-height: 1.3;
  }

  a {
    text-decoration: none;
    color: inherit;
  }

  .container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
  }

  /* 顶部导航 */
  .site-header {
    padding: 16px 0;
    background: rgba(253, 250, 248, 0.9);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .brand-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 800;
    color: var(--text-main);
  }

  .brand-logo img {
    height: 36px;
    width: auto;
    border-radius: 8px;
    object-fit: cover;
  }

  .nav-cta {
    background-color: var(--brand-color);
    color: #fff;
    padding: 8px 20px;
    border-radius: var(--radius-btn);
    font-weight: 600;
    font-size: 14px;
    transition: background 0.2s;
  }

  .nav-cta:hover {
    background-color: var(--brand-hover);
  }

  /* 首屏 */
  .hero {
    padding: 60px 0 40px;
    text-align: center;
  }

  .hero h1 {
    font-size: 32px;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
  }

  .hero p {
    font-size: 16px;
    color: var(--text-sub);
    margin-bottom: 32px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
  }

  .btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--brand-color);
    color: #fff;
    padding: 14px 36px;
    border-radius: var(--radius-btn);
    font-size: 17px;
    font-weight: 700;
    box-shadow: var(--shadow-soft);
    transition: all 0.2s;
  }

  .btn-primary:hover {
    background-color: var(--brand-hover);
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
  }

  /* 角色广场 */
  .section-title {
    font-size: 24px;
    margin-bottom: 12px;
    text-align: center;
  }

  .section-desc {
    text-align: center;
    color: var(--text-sub);
    margin-bottom: 32px;
    font-size: 15px;
  }

  .role-square {
    padding: 40px 0;
  }

  .role-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-top: 24px;
  }

  .role-card {
    background: var(--surface-color);
    border-radius: var(--radius-card);
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--border-color);
    transition: transform 0.2s;
  }

  .role-card:hover {
    transform: translateY(-4px);
  }

  .role-card img {
    width: 100%;
    height: auto;
    aspect-ratio: 3/4;
    object-fit: cover;
    display: block;
  }

  .role-info {
    padding: 16px;
  }

  .role-tag {
    display: inline-block;
    font-size: 12px;
    background: #f7eded;
    color: var(--brand-color);
    padding: 4px 10px;
    border-radius: 20px;
    margin-bottom: 8px;
    font-weight: 600;
  }

  .role-name {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 6px;
  }

  .role-brief {
    font-size: 13px;
    color: var(--text-sub);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  /* 角色互动演示 */
  .interaction-demo {
    padding: 40px 0;
  }

  .feature-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 32px;
  }

  .feature-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    background: var(--surface-color);
    padding: 20px;
    border-radius: var(--radius-card);
    border: 1px solid var(--border-color);
  }

  .feature-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: #f7eded;
    color: var(--brand-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 18px;
    flex-shrink: 0;
  }

  .feature-text h3 {
    font-size: 16px;
    margin-bottom: 4px;
  }

  .feature-text p {
    font-size: 14px;
    color: var(--text-sub);
  }

  .demo-visual {
    margin-top: 32px;
    text-align: center;
  }

  .demo-visual img {
    max-width: 100%;
    border-radius: var(--radius-card);
    box-shadow: var(--shadow-soft);
  }

  /* 创作者中心 */
  .creator-zone {
    padding: 40px 0;
  }

  .creator-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    margin-top: 32px;
  }

  .creator-box {
    background: var(--surface-color);
    padding: 28px 24px;
    border-radius: var(--radius-card);
    border: 1px solid var(--border-color);
    text-align: center;
  }

  .creator-box h3 {
    font-size: 18px;
    margin-bottom: 12px;
    color: var(--brand-color);
  }

  .creator-box p {
    font-size: 14px;
    color: var(--text-sub);
  }

  /* 多模型与API */
  .tech-section {
    padding: 40px 0;
    background: #fff8f6;
    border-radius: var(--radius-card);
    margin: 20px 0;
  }

  .tech-inner {
    padding: 20px;
  }

  .tech-section h2 {
    text-align: center;
    margin-bottom: 16px;
  }

  .tech-section p {
    text-align: center;
    color: var(--text-sub);
    font-size: 15px;
    max-width: 700px;
    margin: 0 auto 20px;
  }

  .tech-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
  }

  .tech-tag {
    background: #fff;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    color: var(--text-main);
    border: 1px solid var(--border-color);
  }

  /* 用户评价 */
  .reviews {
    padding: 40px 0;
  }

  .review-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 32px;
  }

  .review-card {
    background: var(--surface-color);
    padding: 24px;
    border-radius: var(--radius-card);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-soft);
  }

  .review-text {
    font-size: 15px;
    color: var(--text-main);
    margin-bottom: 12px;
  }

  .review-user {
    font-size: 13px;
    color: var(--text-sub);
    text-align: right;
  }

  /* 安全与FAQ */
  .safety-faq {
    padding: 40px 0;
  }

  .safety-box {
    background: #f0f8f4;
    padding: 24px;
    border-radius: var(--radius-card);
    margin-bottom: 32px;
  }

  .safety-box h2 {
    font-size: 20px;
    color: #2e7d53;
    margin-bottom: 12px;
  }

  .safety-box p {
    font-size: 14px;
    color: #3a5e4a;
  }

  .faq-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }

  .faq-item {
    background: var(--surface-color);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow: hidden;
  }

  .faq-question {
    padding: 16px 20px;
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    position: relative;
  }

  .faq-answer {
    padding: 0 20px 16px;
    font-size: 14px;
    color: var(--text-sub);
  }

  /* 底部CTA */
  .footer-cta {
    padding: 60px 0;
    text-align: center;
    background: linear-gradient(180deg, var(--bg-color) 0%, #fff3f0 100%);
  }

  .footer-cta h2 {
    font-size: 28px;
    margin-bottom: 16px;
  }

  .footer-cta p {
    color: var(--text-sub);
    margin-bottom: 24px;
  }

  /* 页脚 */
  .site-footer {
    padding: 32px 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
    font-size: 13px;
    color: var(--text-sub);
  }

  .site-footer p {
    margin-bottom: 8px;
  }

  .time-info {
    font-size: 12px;
    color: #a0928e;
  }

  /* 响应式 */
  @media (min-width: 768px) {
    .hero h1 { font-size: 44px; }
    .hero p { font-size: 18px; }
    .role-grid { grid-template-columns: repeat(3, 1fr); }
    .creator-grid { grid-template-columns: repeat(3, 1fr); }
    .feature-list { flex-direction: row; flex-wrap: wrap; }
    .feature-item { flex: 1 1 calc(50% - 20px); }
    .section-title { font-size: 28px; }
  }

  @media (min-width: 1024px) {
    .hero { padding: 80px 0 60px; }
    .hero h1 { font-size: 52px; }
    .role-grid { grid-template-columns: repeat(4, 1fr); }
    .feature-item { flex: 1 1 calc(33.33% - 20px); }
    .footer-cta h2 { font-size: 36px; }
  }