/* roulang page: index */
:root {
      --ht-primary: #e62143;
      --ht-primary-hover: #c41836;
      --ht-secondary: #121217;
      --ht-dark-card: #1c1c24;
      --ht-light-bg: #f9f9fb;
      --ht-accent: #ff4767;
      --ht-text: #1d1d23;
      --ht-text-muted: #6c727f;
      --ht-border: #e6e8ec;
      --ht-white: #ffffff;
      --ht-radius-sm: 8px;
      --ht-radius: 14px;
      --ht-radius-lg: 22px;
      --ht-shadow: 0 10px 30px rgba(0,0,0,0.06);
      --ht-shadow-hover: 0 18px 40px rgba(230,33,67,0.15);
      --ht-transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    }

    /* Reset & Base */
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--ht-text);
      background-color: #ffffff;
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--ht-transition);
    }
    a:hover {
      color: var(--ht-primary);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: var(--ht-radius-sm);
    }

    /* Custom Header / Nav */
    .ht-header {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--ht-border);
      position: sticky;
      top: 0;
      z-index: 1000;
      padding: 0.85rem 0;
    }
    .ht-nav-wrap {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .ht-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--ht-primary);
      letter-spacing: -0.5px;
    }
    .ht-brand-badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 34px;
      height: 34px;
      background: var(--ht-primary);
      color: #fff;
      border-radius: 9px;
      font-size: 1.1rem;
      box-shadow: 0 4px 12px rgba(230,33,67,0.3);
    }
    .ht-nav-menu {
      display: flex;
      list-style: none;
      margin: 0;
      padding: 0;
      gap: 1.8rem;
      align-items: center;
    }
    .ht-nav-link {
      font-size: 0.95rem;
      font-weight: 600;
      color: #3b4252;
      position: relative;
      padding: 4px 0;
    }
    .ht-nav-link.active, .ht-nav-link:hover {
      color: var(--ht-primary);
    }
    .ht-nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--ht-primary);
      border-radius: 2px;
    }
    .ht-header-action {
      display: flex;
      align-items: center;
      gap: 1rem;
    }

    /* Buttons */
    .ht-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.68rem 1.6rem;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: 99px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--ht-transition);
      box-shadow: 0 3px 10px rgba(0,0,0,0.05);
    }
    .ht-btn-primary {
      background: var(--ht-primary);
      color: #fff !important;
      box-shadow: 0 8px 20px rgba(230,33,67,0.28);
    }
    .ht-btn-primary:hover {
      background: var(--ht-primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(230,33,67,0.38);
    }
    .ht-btn-outline {
      background: transparent;
      color: var(--ht-text);
      border-color: var(--ht-border);
    }
    .ht-btn-outline:hover {
      border-color: var(--ht-primary);
      color: var(--ht-primary);
      background: rgba(230,33,67,0.04);
    }

    /* Typography & Sections */
    .ht-section {
      padding: 5rem 0;
      position: relative;
    }
    .ht-section-muted {
      background-color: var(--ht-light-bg);
      border-top: 1px solid #edf0f5;
      border-bottom: 1px solid #edf0f5;
    }
    .ht-section-dark {
      background-color: var(--ht-secondary);
      color: #ffffff;
    }
    .ht-sec-title-wrap {
      max-width: 780px;
      margin: 0 auto 3.2rem;
      text-align: center;
    }
    .ht-sec-pill {
      display: inline-block;
      padding: 0.35rem 1rem;
      background: rgba(230,33,67,0.09);
      color: var(--ht-primary);
      font-size: 0.8rem;
      font-weight: 700;
      border-radius: 99px;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 0.9rem;
    }
    .ht-sec-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: inherit;
      line-height: 1.35;
      margin-bottom: 1rem;
    }
    .ht-sec-desc {
      color: var(--ht-text-muted);
      font-size: 1.02rem;
      line-height: 1.8;
      margin: 0;
    }
    .ht-section-dark .ht-sec-desc {
      color: #a0a6b5;
    }

    /* Card System */
    .ht-card {
      background: var(--ht-white);
      border-radius: var(--ht-radius);
      border: 1px solid var(--ht-border);
      padding: 2rem;
      height: 100%;
      transition: var(--ht-transition);
      box-shadow: var(--ht-shadow);
      display: flex;
      flex-direction: column;
    }
    .ht-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--ht-shadow-hover);
      border-color: rgba(230,33,67,0.3);
    }
    .ht-card-dark {
      background: var(--ht-dark-card);
      border-color: #2b2b38;
      color: #fff;
    }
    .ht-card-icon {
      width: 52px;
      height: 52px;
      border-radius: 14px;
      background: rgba(230,33,67,0.1);
      color: var(--ht-primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      font-weight: bold;
      margin-bottom: 1.4rem;
    }

    /* Hero Blueprint: Tool landing, pain point 1-line + demo + start use */
    .ht-hero {
      position: relative;
      padding: 5.5rem 0 4.5rem;
      background: radial-gradient(circle at 80% 20%, rgba(230,33,67,0.06), transparent 50%), #fff;
      overflow: hidden;
    }
    .ht-hero-painpoint {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #fff1f3;
      color: var(--ht-primary);
      padding: 0.45rem 1.1rem;
      border-radius: 99px;
      font-size: 0.88rem;
      font-weight: 700;
      margin-bottom: 1.5rem;
      border: 1px solid rgba(230,33,67,0.15);
    }
    .ht-hero-title {
      font-size: 2.7rem;
      font-weight: 900;
      line-height: 1.25;
      letter-spacing: -0.5px;
      margin-bottom: 1.3rem;
      color: var(--ht-text);
    }
    .ht-hero-title span {
      color: var(--ht-primary);
    }
    .ht-hero-lead {
      font-size: 1.12rem;
      line-height: 1.85;
      color: #555b68;
      margin-bottom: 2rem;
    }
    .ht-demo-box {
      background: #0f1015;
      border-radius: var(--ht-radius-lg);
      padding: 1.2rem;
      box-shadow: 0 25px 60px rgba(0,0,0,0.22);
      border: 1px solid #232532;
      position: relative;
    }
    .ht-demo-bar {
      display: flex;
      align-items: center;
      gap: 7px;
      margin-bottom: 1rem;
      padding-left: 4px;
    }
    .ht-demo-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: #393c4e;
    }
    .ht-demo-media {
      position: relative;
      border-radius: var(--ht-radius-sm);
      overflow: hidden;
      aspect-ratio: 16/9;
      background-size: cover;
      background-position: center;
    }
    .ht-demo-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(0,0,0,0.1) 0%, rgba(0,0,0,0.85) 100%);
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      padding: 1.4rem;
      color: #fff;
    }
    .ht-demo-play-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--ht-primary);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 0.8rem;
      box-shadow: 0 0 20px rgba(230,33,67,0.6);
    }

    /* Section-specific widgets */
    .ht-check-list {
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .ht-check-item {
      display: flex;
      gap: 12px;
      margin-bottom: 1.2rem;
      font-size: 0.98rem;
      color: #4b5262;
    }
    .ht-check-item strong {
      color: var(--ht-text);
      display: block;
      margin-bottom: 2px;
    }
    .ht-badge-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
      gap: 1.5rem;
    }
    .ht-badge-card {
      background: #ffffff;
      border: 1px dashed #d6dae3;
      padding: 1.6rem;
      border-radius: var(--ht-radius);
      text-align: center;
      transition: var(--ht-transition);
    }
    .ht-badge-card:hover {
      border-color: var(--ht-primary);
      background: #fff8f9;
    }
    .ht-badge-val {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--ht-primary);
      margin-bottom: 0.4rem;
    }

    /* Step flow */
    .ht-step-card {
      position: relative;
      padding: 2.2rem 1.8rem;
      background: #fff;
      border-radius: var(--ht-radius);
      border: 1px solid var(--ht-border);
      height: 100%;
    }
    .ht-step-num {
      font-size: 2.2rem;
      font-weight: 900;
      color: #e2e5ec;
      line-height: 1;
      margin-bottom: 1rem;
      display: block;
    }

    /* News & Info Cards */
    .ht-news-card {
      background: #fff;
      border: 1px solid var(--ht-border);
      border-radius: var(--ht-radius);
      overflow: hidden;
      height: 100%;
      display: flex;
      flex-direction: column;
      box-shadow: 0 4px 15px rgba(0,0,0,0.03);
    }
    .ht-news-thumb {
      height: 200px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .ht-news-tag {
      position: absolute;
      top: 12px;
      left: 12px;
      background: rgba(0,0,0,0.7);
      color: #fff;
      font-size: 0.75rem;
      padding: 4px 10px;
      border-radius: 4px;
      backdrop-filter: blur(4px);
    }
    .ht-news-body {
      padding: 1.6rem;
      flex: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    /* FAQ Box */
    .ht-faq-item {
      background: #fff;
      border: 1px solid var(--ht-border);
      border-radius: var(--ht-radius-sm);
      margin-bottom: 1.1rem;
      padding: 1.3rem 1.6rem;
      transition: var(--ht-transition);
    }
    .ht-faq-item:hover {
      border-color: #cbd2df;
    }
    .ht-faq-q {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--ht-text);
      margin-bottom: 0.5rem;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .ht-faq-q::before {
      content: '问';
      width: 24px;
      height: 24px;
      background: #ffebee;
      color: var(--ht-primary);
      font-size: 0.78rem;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      font-weight: 800;
    }
    .ht-faq-a {
      font-size: 0.95rem;
      color: var(--ht-text-muted);
      line-height: 1.75;
      padding-left: 34px;
      margin: 0;
    }

    /* Fixed CTA Strip */
    .ht-float-cta {
      position: fixed;
      bottom: 20px;
      right: 20px;
      z-index: 990;
      background: var(--ht-secondary);
      color: #fff;
      padding: 0.85rem 1.6rem;
      border-radius: 99px;
      display: flex;
      align-items: center;
      gap: 14px;
      box-shadow: 0 12px 35px rgba(0,0,0,0.3);
      border: 1px solid #323546;
      transition: var(--ht-transition);
    }
    .ht-float-cta:hover {
      transform: translateY(-3px);
      box-shadow: 0 16px 40px rgba(230,33,67,0.35);
    }

    /* Footer */
    .ht-footer {
      background: #0f1014;
      color: #9499a6;
      padding: 4.5rem 0 2rem;
      font-size: 0.9rem;
      border-top: 1px solid #1f222c;
    }
    .ht-footer-title {
      color: #fff;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 1.4rem;
    }
    .ht-footer-links {
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .ht-footer-links li {
      margin-bottom: 0.75rem;
    }
    .ht-footer-links a:hover {
      color: #fff;
    }
    .ht-footer-bottom {
      margin-top: 3.5rem;
      padding-top: 1.8rem;
      border-top: 1px solid #1d202a;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 1rem;
      font-size: 0.85rem;
    }

    /* Responsive */
    @media screen and (max-width: 1024px) {
      .ht-sec-title { font-size: 1.85rem; }
      .ht-hero-title { font-size: 2.2rem; }
    }
    @media screen and (max-width: 768px) {
      .ht-section { padding: 3.5rem 0; }
      .ht-hero { padding: 3.5rem 0 2.5rem; }
      .ht-hero-title { font-size: 1.85rem; }
      .ht-float-cta {
        bottom: 12px;
        left: 12px;
        right: 12px;
        justify-content: space-between;
        border-radius: 12px;
      }
      .ht-footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }