:root {
    --color-primary: #92634c;
    --color-primary-light: #c59780;
    --color-text: #474747;
    --color-title: #333;
    --color-subtitle: #6b6b6c;
    --color-border: #d9d4d2;
    --color-card-bg: #ffffff;
    --color-card-fill: #f4f4f4;
    --color-muted: #7e7e7e;
    --color-accent: #0b9682;
    --color-check: #16c4af;
    --shadow-card: 5px 16px 10px rgba(139,127,127,0.078);
  }


  html {
    font-size: 16px;
  }

  body {
    font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
  }


  /* ========== FAQ Main Page ========== */
  .faq-main {
    position: relative;
    min-height: 100vh;
    background: #fff;
    overflow: hidden;
  }

  .faq-bg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center bottom;
    z-index: 0;
    pointer-events: none;
    transform: rotate(180deg);
  }

  .faq-header {
    position: relative;
    z-index: 2;
    max-width: 1390px;
    margin: 0 auto;
    padding: clamp(80px, 12vw, 160px) 20px 0;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: clamp(12px, 2.5vw, 40px);
  }

  .faq-avatar-wrap {
    position: relative;
    width: clamp(140px, 18vw, 213px);
    height: clamp(122px, 15.7vw, 186px);
    flex-shrink: 0;
    overflow: hidden;
    border-radius: 4px;
  }

  .faq-avatar {
    position: absolute;
    left: -11.3%;
    top: -10.2%;
    width: 115%;
    height: auto;
  }

  .faq-header-text {
    padding-top: clamp(20px, 4vw, 60px);
  }

  .faq-title {
    font-size: clamp(28px, 4vw, 42px);
    font-weight: bold;
    color: var(--color-title);
    margin-bottom: 8px;
    line-height: 1.3;
  }

  .faq-subtitle {
    font-size: clamp(14px, 1.8vw, 20px);
    color: var(--color-subtitle);
  }

  .faq-grid {
    position: relative;
    z-index: 2;
    max-width: 1390px;
    margin: clamp(40px, 5vw, 72px) auto 60px;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .faq-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 14px;
    padding: clamp(28px, 3vw, 58px) clamp(20px, 2.5vw, 34px) clamp(20px, 2vw, 30px);
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
  }

  .faq-card-title {
    font-size: clamp(20px, 2vw, 26px);
    font-weight: bold;
    color: #3e3a39;
    margin-bottom: clamp(16px, 2vw, 30px);
    display: flex;
    align-items: center;
    gap: 10px;
    padding-left: clamp(8px, 1.2vw, 16px);
  }

  .faq-card-title svg,
  .faq-card-title img.faq-card-icon {
    width: 30px;
    height: 30px;
    flex-shrink: 0;
    color: var(--color-primary);
    object-fit: contain;
  }

  .faq-card-list {
    list-style: none;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 12px;
  }

  .faq-card-list li {
    display: flex;
    align-items: flex-start;
    cursor: pointer;
    transition: color 0.2s;
  }

  .faq-card-list li::before {
    content: '';
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--color-primary-light);
    margin-right: 16px;
    margin-top: 10px;
    flex-shrink: 0;
  }

  .faq-card-list li a {
    font-size: clamp(15px, 1.5vw, 20px);
    color: var(--color-text);
    text-decoration: none;
    transition: color 0.2s;
    line-height: 1.6;
  }

  .faq-card-list li:hover,
  .faq-card-list li:hover a {
    color: var(--color-primary);
  }

  .faq-card-list li.highlighted {
    background: #fff;
    border: 1px solid #707070;
    border-radius: 4px;
    padding: 8px 14px;
    margin-top: 4px;
  }

  .faq-card-list li.highlighted::before {
    background: var(--color-primary-light);
    margin-top: 8px;
  }

  .faq-card-list li.highlighted a {
    color: var(--color-primary-light);
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
  }

  .faq-card-list li.highlighted a::after {
    content: '';
    width: 18px;
    height: 18px;
    background: currentColor;
    mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='currentColor'%3E%3Cpath d='M8.59 16.59L13.17 12 8.59 7.41 10 6l6 6-6 6z'/%3E%3C/svg%3E") no-repeat center;
    mask-size: contain;
    -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='currentColor'%3E%3Cpath d='M8.59 16.59L13.17 12 8.59 7.41 10 6l6 6-6 6z'/%3E%3C/svg%3E") no-repeat center;
    -webkit-mask-size: contain;
    flex-shrink: 0;
    margin-left: auto;
  }

  /* ========== Detail Page ========== */
  .detail-pages {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--color-bg);
    padding: 0 clamp(16px, 3vw, 40px) clamp(40px, 5vw, 80px);
    position: relative;
    overflow: hidden;
  }

  .detail-decoration {
    position: absolute;
    right: -10vw;
    top: clamp(800px, 60vw, 1200px);
    width: clamp(320px, 40vw, 640px);
    opacity: 0.04;
    z-index: 0;
    pointer-events: none;
  }

  .detail-header {
    text-align: left;
    padding: clamp(40px, 6vw, 80px) 0 clamp(20px, 3vw, 40px);
    position: relative;
    z-index: 1;
  }

  .detail-title {
    font-size: clamp(26px, 3.5vw, 42px);
    font-weight: bold;
    color: var(--color-title);
    margin-bottom: 20px;
    line-height: 1.3;
  }

  .detail-section {
    margin-bottom: clamp(32px, 4vw, 50px);
    position: relative;
    z-index: 1;
  }

  .detail-section-title {
    font-size: clamp(20px, 2.2vw, 26px);
    font-weight: bold;
    color: var(--color-title);
    margin-bottom: clamp(16px, 2vw, 24px);
  }

  .detail-body-text,
  .detail-accent-text {
    font-size: clamp(15px, 1.5vw, 20px);
    line-height: 1.9;
    white-space: pre-wrap;
  }

  .detail-body-text {
    color: var(--color-text);
  }

  .detail-accent-text {
    color: var(--color-primary);
  }

  /* Two-column info cards */
  .info-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: clamp(16px, 2vw, 30px);
    margin: 24px 0;
  }

  .info-card {
    background: var(--color-card-fill);
    border-radius: 16px;
    padding: clamp(18px, 2vw, 25px) clamp(20px, 2.5vw, 30px);
  }

  .info-card-title {
    font-size: clamp(16px, 1.5vw, 20px);
    font-weight: bold;
    color: var(--color-primary);
    margin-bottom: 10px;
  }

  .info-card-body {
    font-size: clamp(14px, 1.5vw, 20px);
    color: var(--color-text);
    line-height: 1.9;
    white-space: pre-wrap;
  }

  /* Steps */
  .steps-row {
    display: flex;
    justify-content: flex-start;
    gap: clamp(24px, 5vw, 80px);
    margin: 30px 0;
    position: relative;
  }

  .steps-row::before {
    content: '';
    position: absolute;
    left: 20px;
    right: 20px;
    top: 14px;
    height: 1px;
    background: #d2d2d2;
    z-index: 0;
  }

  .step-item {
    position: relative;
    z-index: 1;
    flex: 0 0 auto;
    max-width: clamp(220px, 30vw, 360px);
  }

  .step-dot {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    margin-bottom: 12px;
  }

  .step-dot.active {
    background: var(--color-primary);
    border: 10px solid var(--color-primary-light);
  }

  .step-dot.inactive {
    background: #acacac;
    border: 10px solid #e8e8e8;
  }

  .step-label {
    font-size: clamp(14px, 1.5vw, 20px);
    color: var(--color-primary);
    margin-bottom: 4px;
  }

  .step-label.inactive { color: var(--color-muted); }

  .step-title {
    font-size: clamp(16px, 1.5vw, 20px);
    font-weight: bold;
  }

  .step-title.active { color: var(--color-primary); }
  .step-title.inactive { color: var(--color-muted); }

  .step-desc {
    font-size: clamp(14px, 1.5vw, 20px);
    color: var(--color-text);
    margin-top: 10px;
    white-space: pre-wrap;
  }

  .step-desc.inactive { color: var(--color-muted); }

  /* Big step circles (for page 2) */
  .big-steps {
    display: flex;
    justify-content: center;
    gap: clamp(24px, 4vw, 60px);
    margin: 30px 0;
  }

  .big-step {
    text-align: center;
    flex: 1;
    max-width: 420px;
  }

  .big-step-circle {
    width: clamp(56px, 8vw, 78px);
    height: clamp(56px, 8vw, 78px);
    border-radius: 50%;
    background: var(--color-primary);
    margin: 0 auto 15px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .big-step-title {
    font-size: clamp(16px, 1.5vw, 20px);
    font-weight: bold;
    color: var(--color-primary);
    margin-bottom: 8px;
  }

  .big-step-desc {
    font-size: clamp(14px, 1.5vw, 20px);
    color: var(--color-text);
    line-height: 1.6;
  }

  /* Case studies */
  .case-row {
    display: flex;
    align-items: flex-start;
    gap: clamp(16px, 2.5vw, 30px);
    margin-bottom: clamp(20px, 3vw, 30px);
  }

  .case-avatar-wrapper {
    position: relative;
    flex-shrink: 0;
    width: clamp(110px, 18vw, 162px);
    height: clamp(120px, 22vw, 200px);
  }

  .case-avatar-wrapper::after {
    content: '';
    position: absolute;
    inset: 0;
    border: 1px dashed rgba(112,112,112,0.5);
    pointer-events: none;
  }

  .case-avatar {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
  }

  .case-content { flex: 1; min-width: 0; }

  .case-name {
    font-size: clamp(16px, 1.5vw, 20px);
    font-weight: bold;
    color: var(--color-primary);
    margin-bottom: 10px;
  }

  .case-text {
    font-size: clamp(14px, 1.5vw, 20px);
    color: var(--color-text);
    line-height: 1.9;
    white-space: pre-wrap;
  }

  /* CTA box */
  .cta-box {
    border: 2px solid var(--color-primary-light);
    border-radius: 16px;
    padding: clamp(20px, 2.5vw, 30px) clamp(24px, 3vw, 40px);
    margin: 30px 0;
    background: url('images/bj1.png') center/cover no-repeat;
    display: flex;
    align-items: center;
    gap: 20px;
  }

  .cta-icon {
    width: clamp(56px, 8vw, 80px);
    height: clamp(56px, 8vw, 80px);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(24px, 3vw, 36px);
    background: var(--color-accent);
    border-radius: 50%;
    color: #fff;
  }

  .cta-content { flex: 1; min-width: 0; }

  .cta-title {
    font-size: clamp(16px, 1.8vw, 22px);
    font-weight: bold;
    color: var(--color-primary);
    margin-bottom: 8px;
  }

  .cta-text {
    font-size: clamp(15px, 1.8vw, 22px);
    color: var(--color-title);
  }

  .cta-text .inline-icon {
    width: 1.2em;
    height: 1.2em;
    vertical-align: -0.2em;
    margin-right: 0.3em;
    object-fit: contain;
    display: inline-block;
  }

  /* Q&A items */
  .qa-item {
    margin-bottom: clamp(16px, 2vw, 20px);
    padding-bottom: clamp(16px, 2vw, 20px);
    border-bottom: 1px solid #d2d2d2;
  }

  .qa-item:last-child { border-bottom: none; }

  .qa-question {
    font-size: clamp(17px, 1.8vw, 22px);
    font-weight: bold;
    color: var(--color-text);
    margin-bottom: 8px;
  }

  .qa-question .q-label {
    color: var(--color-primary);
    margin-right: 8px;
  }

  .qa-answer {
    font-size: clamp(14px, 1.5vw, 20px);
    color: var(--color-text);
    line-height: 1.9;
  }

  /* Related links */
  .related-list {
    list-style: none;
  }

  .related-list li {
    background: var(--color-card-fill);
    border-radius: 16px;
    padding: 0 20px;
    width: 483px;
    height: 66px;
    margin-bottom: clamp(12px, 1.5vw, 20px);
    display: flex;
    align-items: center;
    gap: 16px;
    cursor: pointer;
    transition: background 0.2s;
    box-sizing: border-box;
  }

  @media (max-width: 520px) {
    .related-list li {
      width: 100%;
      height: auto;
      min-height: 54px;
      padding: 12px 16px;
    }
  }

  .related-list li:hover { background: #ececec; }

  .related-num {
    font-size: clamp(14px, 1.5vw, 20px);
    color: var(--color-text);
    min-width: 36px;
    flex-shrink: 0;
  }

  .related-text {
    flex: 1;
    font-size: clamp(14px, 1.5vw, 20px);
    color: var(--color-text);
  }

  .related-arrow {
    width: 26px;
    height: 26px;
    flex-shrink: 0;
    object-fit: contain;
  }

  /* Comparison table */
  .compare-table {
    background: var(--color-card-fill);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid rgba(112,112,112,0.1);
  }

  .compare-header {
    background: #f6f0ed;
    display: grid;
    grid-template-columns: 1fr 1fr;
    padding: clamp(16px, 2vw, 23px) clamp(20px, 2.5vw, 30px);
    gap: clamp(16px, 2vw, 30px);
  }

  .compare-header-item {
    font-size: clamp(15px, 1.5vw, 20px);
    font-weight: bold;
    color: var(--color-primary);
  }

  .compare-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    padding: clamp(20px, 2.5vw, 30px);
    gap: clamp(16px, 2vw, 30px);
  }

  .compare-col {
    font-size: clamp(14px, 1.5vw, 20px);
    color: var(--color-text);
    line-height: 2.2;
    white-space: pre-wrap;
  }

  /* Bottom CTA */
  .bottom-cta {
    margin-top: clamp(40px, 5vw, 60px);
    background: url('images/bg.png') center/cover no-repeat;
    border-radius: 16px;
    padding: clamp(40px, 5vw, 60px) clamp(20px, 3vw, 40px);
    text-align: center;
    position: relative;
  }

  .bottom-cta::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 16px;
  }

  .bottom-cta > * { position: relative; z-index: 1; }

  .bottom-cta-title {
    font-size: clamp(22px, 2.8vw, 32px);
    font-weight: bold;
    color: var(--color-title);
    margin-bottom: clamp(20px, 3vw, 30px);
  }

  .form-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    justify-content: center;
    flex-wrap: wrap;
  }

  .form-label {
    font-size: 14px;
    color: var(--color-text);
    min-width: 36px;
    text-align: right;
  }

  .form-input {
    width: 100%;
    max-width: 300px;
    height: 46px;
    border: 1px solid #e8e8e8;
    border-radius: 6px;
    padding: 0 15px;
    font-size: 14px;
    background: #fff;
    color: var(--color-text);
    outline: none;
    font-family: inherit;
  }

  .form-input:focus { border-color: var(--color-primary-light); }

  .submit-btn {
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: 21px;
    padding: 12px 30px;
    font-size: 14px;
    cursor: pointer;
    margin-top: 15px;
    font-family: inherit;
    transition: background 0.2s;
  }

  .submit-btn:hover { background: #7a4f3e; }

  .submit-hint {
    font-size: 14px;
    color: var(--color-primary-light);
    margin-top: 10px;
  }

  /* Suitability list (page 2) */
  .suit-list {
    list-style: none;
  }

  .suit-list li {
    font-size: clamp(16px, 1.8vw, 22px);
    font-weight: bold;
    color: var(--color-text);
    margin-bottom: clamp(12px, 1.5vw, 20px);
    display: flex;
    align-items: center;
    gap: 12px;
    position: relative;
  }

  .suit-list li::before {
    content: '';
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--color-check);
    flex-shrink: 0;
  }

  .suit-list li::after {
    content: '\2713';
    position: absolute;
    left: 6px;
    color: #fff;
    font-size: 14px;
    line-height: 24px;
  }

  /* Back button */
  .back-btn {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 100;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: 25px;
    padding: 10px 20px;
    font-size: 14px;
    cursor: pointer;
    font-family: inherit;
    transition: background 0.2s;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  }

  .back-btn:hover { background: #7a4f3e; }

  /* Page switching */

  /* Highlighted question */
  .highlight-q {
    background: #fff;
    border: 1px solid #707070;
    border-radius: 4px;
    padding: 8px 25px;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin: 15px 0 0;
    font-size: 20px;
    color: var(--color-primary-light);
    cursor: pointer;
  }

  .highlight-q::before {
    content: '';
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--color-primary-light);
  }

  .highlight-q img {
    width: 20px;
    height: 20px;
  }

  /* ========== Responsive Breakpoints ========== */
  @media (max-width: 1200px) {
    .faq-grid {
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }
  }

  @media (max-width: 992px) {
    .faq-grid {
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .faq-avatar-wrap {
      width: 160px;
      height: 140px;
    }

    .faq-header {
      gap: 20px;
    }

    .info-cards,
    .compare-header,
    .compare-body {
      grid-template-columns: 1fr;
    }

    .steps-row {
      flex-direction: column;
      gap: 24px;
    }

    .steps-row::before { display: none; }

    .step-item { max-width: 100%; }

    .big-steps {
      flex-direction: column;
      align-items: center;
    }

    .big-step { width: 100%; max-width: 100%; }
  }

  @media (max-width: 768px) {
    .faq-header {
      flex-direction: column;
      align-items: center;
      text-align: center;
      padding-top: 60px;
    }

    .faq-avatar-wrap {
      width: 180px;
      height: 157px;
    }

    .faq-header-text { padding-top: 0; }

    .faq-grid {
      grid-template-columns: 1fr;
      max-width: 520px;
    }

    .faq-card-list li.highlighted {
      padding: 10px 14px;
    }

    .case-row {
      flex-direction: column;
      align-items: center;
      text-align: center;
    }

    .case-avatar-wrapper {
      width: 130px;
      height: 160px;
    }

    .cta-box {
      flex-direction: column;
      text-align: center;
    }

    .form-row {
      flex-direction: column;
      align-items: stretch;
    }

    .form-label {
      text-align: left;
    }

    .form-input {
      max-width: 100%;
    }

    .back-btn {
      top: 12px;
      left: 12px;
      padding: 8px 16px;
      font-size: 13px;
    }

    .detail-decoration {
      display: none;
    }
  }

  @media (max-width: 480px) {
    .faq-avatar-wrap {
      width: 150px;
      height: 131px;
    }

    .faq-card {
      padding: 24px 20px;
    }

    .faq-card-title svg,
    .faq-card-title img.faq-card-icon {
      width: 24px;
      height: 24px;
    }

    .detail-pages {
      padding: 0 16px 40px;
    }

    .cta-icon {
      width: 50px;
      height: 50px;
      font-size: 20px;
    }

    .compare-header,
    .compare-body {
      padding: 16px 20px;
      gap: 12px;
    }
  }

  @media (min-width: 1440px) {
    .faq-header {
      padding-top: 160px;
    }

    .faq-avatar-wrap {
      width: 213px;
      height: 186px;
    }
  }