*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", -apple-system, sans-serif;
    color: #1a1a1a;
    background: #faf8f5;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
  }
  a { color: inherit; text-decoration: none; }

  /* ── Nav ── */
  .nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    padding: 1.125rem 3rem;
    display: flex; justify-content: space-between; align-items: center;
    background: rgba(255,255,255,0.94);
    backdrop-filter: blur(16px);
    box-shadow: 0 1px 0 rgba(0,0,0,0.04);
  }
  .nav-logo {
    display: flex; align-items: center; gap: 0.75rem;
  }
  .nav-logo img { display: block; height: 36px; width: auto; }
  .nav-brand-text {
    font-size: 1.0625rem;
    font-weight: 700;
    color: #1a1a1a;
    letter-spacing: 0.12em;
  }
  .nav-links {
    display: flex; align-items: center; gap: 2rem;
    list-style: none;
  }
  .nav-links a {
    font-size: 0.8125rem;
    font-weight: 500;
    color: rgba(0,0,0,0.5);
    letter-spacing: 0.06em;
    transition: color 0.3s ease;
  }
  .nav-links a:hover { color: #1a1a1a; }
  .nav-back {
    font-size: 0.8125rem;
    font-weight: 600;
    color: #1a1a1a;
    padding: 0.5rem 1.25rem;
    border: 1px solid rgba(0,0,0,0.12);
    border-radius: 100px;
    transition: all 0.3s ease;
  }
  .nav-back:hover { border-color: #c8873a; color: #c8873a; }

  /* ── Hero ── */
  .page-hero {
    margin-top: 66px;
    background: linear-gradient(135deg, #0a1a18 0%, #1a3a34 100%);
    padding: 5rem 2rem 4rem;
    text-align: center;
    position: relative;
    overflow: hidden;
  }
  .page-hero::after {
    content: "";
    position: absolute; top: -40%; right: -10%;
    width: 400px; height: 400px;
    border-radius: 50%;
    border: 1px solid rgba(200,135,58,0.06);
  }
  .page-hero h1 {
    font-size: clamp(2.2rem, 4.5vw, 3.2rem);
    font-weight: 700;
    color: #fff;
    letter-spacing: -0.02em;
    margin-bottom: 0.75rem;
    position: relative; z-index: 1;
  }
  .page-hero p {
    font-size: clamp(0.9375rem, 1.4vw, 1.125rem);
    color: rgba(255,255,255,0.5);
    max-width: 480px;
    margin: 0 auto;
    position: relative; z-index: 1;
  }

  /* ── Content ── */
  .content { padding: 4.5rem 2rem 5.5rem; }
  .content-inner { max-width: 760px; margin: 0 auto; }

  .section-block { margin-bottom: 3.5rem; }
  .section-block:last-child { margin-bottom: 0; }

  .section-block h2 {
    font-size: 1.375rem;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 1.25rem;
    padding-left: 1rem;
    border-left: 3px solid #c8873a;
    line-height: 1.3;
  }

  .section-block p {
    font-size: 0.9375rem;
    color: #555;
    line-height: 1.85;
    margin-bottom: 0.75rem;
  }

  .section-block ul { list-style: none; padding: 0; }
  .section-block li {
    font-size: 0.9375rem;
    color: #555;
    line-height: 1.7;
    padding: 0.7rem 0 0.7rem 1.75rem;
    position: relative;
    border-bottom: 1px solid #f0ece6;
  }
  .section-block li:last-child { border-bottom: none; }
  .section-block li::before {
    content: "";
    position: absolute; left: 0.5rem; top: 1.1rem;
    width: 5px; height: 5px;
    border-radius: 50%;
    background: #c8873a;
  }
  .highlight { color: #c8873a; font-weight: 600; }
  .highlight-dark { color: #0a1a18; font-weight: 600; }
  .tips-tag{display:inline-block;font-size:.6875rem;font-weight:600;padding:.15rem .6rem;border-radius:4px;margin-right:.25rem}
  .tips-tag.tt-green{background:#e6f7ef;color:#36B37E}
  .tips-tag.tt-orange{background:#fff3e0;color:#dba459}
  .tips-tag.tt-blue{background:#e8f0fe;color:#4a90d9}
  .tips-tag.tt-gold{background:#fef6e6;color:#d99a2b}
  .tips-tag.tt-purple{background:#f3e8ff;color:#7c3aed}
  .tips-tag.tt-red{background:#fde8e8;color:#e8565a}
  .tips-tag.tt-pink{background:#fce8f0;color:#d9487a}

  /* ── Side-by-side Cards ── */
  .dual-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
  }
  .dual-card {
    background: #fff;
    border: 1px solid #ebe6de;
    border-radius: 16px;
    padding: 1.75rem 1.5rem;
    transition: all 0.3s ease;
  }
  .dual-card:hover { box-shadow: 0 8px 24px rgba(0,0,0,0.04); }
  .dual-card .dc-icon {
    width: 40px; height: 40px;
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
  }
  .dual-card .dc-icon.light { background: #f0f6f5; }
  .dual-card .dc-icon.deep { background: #faf6f0; }
  .dual-card h3 {
    font-size: 1rem;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 0.5rem;
  }
  .dual-card p {
    font-size: 0.875rem;
    color: #888;
    line-height: 1.7;
    margin: 0;
  }
  .dual-card .dc-tag {
    display: inline-block;
    font-size: 0.6875rem;
    font-weight: 600;
    padding: 0.2rem 0.6rem;
    border-radius: 100px;
    margin-top: 0.75rem;
  }
  .dual-card .dc-tag.low { background: #f0f6f5; color: #3a7a6a; }
  .dual-card .dc-tag.high { background: #faf6f0; color: #c8873a; }

  /* ── Security Banner ── */
  .security-banner {
    background: linear-gradient(135deg, #0a1a18, #1a3a34);
    border-radius: 16px;
    padding: 2rem 2rem 1.75rem;
    color: #fff;
    position: relative;
    overflow: hidden;
  }
  .security-banner::after {
    content: "";
    position: absolute; top: -30%; right: -8%;
    width: 200px; height: 200px;
    border-radius: 50%;
    border: 1px solid rgba(200,135,58,0.08);
  }
  .security-banner .sb-icon { font-size: 1.5rem; margin-bottom: 0.75rem; }
  .security-banner h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: #e8c580;
  }
  .security-banner p, .security-banner li {
    font-size: 0.875rem;
    color: rgba(255,255,255,0.75);
    line-height: 1.8;
    position: relative; z-index: 1;
  }
  .security-banner ul { list-style: none; padding: 0; }
  .security-banner li {
    padding: 0.4rem 0 0.4rem 1.25rem;
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }
  .security-banner li:last-child { border-bottom: none; }
  .security-banner li::before {
    content: "✓";
    position: absolute; left: 0;
    color: #c8873a;
    font-weight: 700;
  }

  /* ── Tip Box ── */
  .tip-box {
    background: #fffcf7;
    border: 1px solid #f5e0b8;
    border-radius: 16px;
    padding: 1.75rem;
    position: relative;
    border-top: 3px solid #c8873a;
  }
  .tip-box h3 {
    font-size: 1rem;
    font-weight: 700;
    color: #c8873a;
    margin-bottom: 0.5rem;
  }
  .tip-box h3::before {
    content: "💡";
    margin-right: 0.4rem;
  }
  .tip-box p {
    font-size: 0.875rem;
    color: #666;
    line-height: 1.8;
    margin: 0;
  }

  /* ── Service Card ── */
  .service-card {
    background: #fff;
    border: 1px solid #ebe6de;
    border-radius: 16px;
    padding: 1.75rem;
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
  }
  .service-card + .service-card { margin-top: 1rem; }
  .service-card .sc-icon {
    width: 44px; height: 44px;
    min-width: 44px;
    background: #faf6f0;
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.25rem;
  }
  .service-card .sc-content h3 {
    font-size: 1rem;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 0.25rem;
  }
  .service-card .sc-content p {
    font-size: 0.875rem;
    color: #888;
    line-height: 1.7;
    margin: 0;
  }
  .service-card .sc-wechat {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    margin-top: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: #c8873a;
    background: #faf6f0;
    padding: 0.3rem 0.75rem;
    border-radius: 100px;
  }

  /* ── Report Block ── */
  .report-block {
    background: #fff8f0;
    border: 1px solid #f0e4d0;
    border-radius: 12px;
    padding: 1.5rem 1.75rem;
    margin-top: 1rem;
  }
  .report-block p {
    font-size: 0.875rem !important;
    color: #555 !important;
    line-height: 1.9 !important;
    margin: 0 !important;
    font-style: normal;
  }
  .report-block .rb-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: #c8873a;
    margin-bottom: 0.5rem;
    letter-spacing: 0.05em;
  }

  /* ── Tier Compare ── */
  .tier-compare {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    background: #ebe6de;
    border-radius: 12px;
    overflow: hidden;
    margin-top: 0.5rem;
  }
  .tier-item {
    background: #fff;
    padding: 1.5rem 1.5rem;
    text-align: center;
  }
  .tier-item .ti-icon { font-size: 1.5rem; margin-bottom: 0.5rem; }
  .tier-item h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
  }
  .tier-item p {
    font-size: 0.8125rem;
    color: #888;
    line-height: 1.6;
    margin: 0;
  }
  .tier-item .ti-badge {
    display: inline-block;
    margin-top: 0.75rem;
    font-size: 0.6875rem;
    font-weight: 600;
    padding: 0.2rem 0.75rem;
    border-radius: 100px;
    background: #faf6f0;
    color: #c8873a;
  }
  .tier-item.tier-highlight {
    background: linear-gradient(135deg, #fef6e6, #fdf0d8);
    border: 1px solid #f5e0b8;
    color: #1a1a1a;
  }
  .tier-item.tier-highlight h3 { color: #c8873a; }
  .tier-item.tier-highlight p { color: #888; }
  .tier-item.tier-highlight .ti-badge {
    background: #c8873a;
    color: #fff;
  }
  .tier-note {
    font-size: 0.8125rem;
    color: #999;
    text-align: center;
    margin-top: 0.75rem !important;
  }
  .tier-note strong { color: #c8873a; }

  /* ── Refund Box ── */
  .refund-box {
    background: #fffcfa;
    border: 1px solid #f5e8d8;
    border-radius: 12px;
    padding: 1.25rem 1.5rem;
    margin-top: 0.5rem;
  }
  .refund-box p {
    font-size: 0.875rem;
    color: #777;
    line-height: 1.8;
    margin: 0;
  }
  .refund-box p strong { color: #c8873a; }

  /* ── Steps ── */
  .steps { counter-reset: step; }
  .step-item {
    counter-increment: step;
    padding: 1.35rem 0 1.35rem 3.75rem;
    position: relative;
    border-bottom: 1px solid #f0ece6;
    transition: background 0.2s ease;
  }
  .step-item:last-child { border-bottom: none; }
  .step-item:hover { background: #fff; border-radius: 8px; margin: 0 -1rem; padding-left: calc(3.75rem - 1rem); padding-right: 1rem; }
  .step-item::before {
    content: counter(step);
    position: absolute; left: 0; top: 1.3rem;
    width: 30px; height: 30px;
    background: linear-gradient(135deg, #c8873a, #dba459);
    color: #fff;
    font-size: 0.8125rem;
    font-weight: 700;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 2px 8px rgba(200,135,58,0.25);
  }
  .step-item h3 {
    font-size: 1rem;
    font-weight: 700;
    color: #1a1a1a;
    margin-bottom: 0.2rem;
  }
  .step-item p {
    font-size: 0.875rem;
    color: #888;
    margin: 0;
    line-height: 1.7;
  }


  /* ── Back to Top ── */
  .back-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 99;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(0,0,0,0.08);
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: #888;
    cursor: pointer;
    transition: all 0.3s ease;
    opacity: 0;
    pointer-events: none;
  }
  .back-top.show { opacity: 1; pointer-events: auto; }
  .back-top:hover { color: #c8873a; border-color: #c8873a; transform: translateY(-3px); }


  /* ── Mobile Nav ── */
  .nav-toggle {
    display: none;
    flex-direction: column; gap: 5px;
    background: none; border: none; cursor: pointer;
    padding: 4px;
  }
  .nav-toggle span {
    display: block;
    width: 22px; height: 1.5px;
    background: #1a1a1a;
    transition: all 0.3s ease;
    border-radius: 1px;
  }
  .nav-links.open {
    display: flex !important;
    flex-direction: column;
    position: fixed; top: 66px; left: 0; right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(16px);
    padding: 1rem 1.5rem;
    box-shadow: 0 4px 20px rgba(0,0,0,0.06);
    gap: 1.25rem;
    align-items: flex-start;
  }
  .nav-links.open a { color: #1a1a1a; }

    @media (max-width: 768px) {
    .nav-toggle { display: flex; }
    .nav { padding: 0.875rem 1.25rem; }
    .nav-links { display: none; }
    .page-hero { padding: 2.5rem 1.25rem; margin-top: 54px; }
    .page-hero h1 { font-size: 1.375rem; }
    .content { padding: 1.5rem 1.25rem; }
  }