/* roulang page: index */
:root {
  --brand: #2F6BFF;
  --brand-deep: #1D4FD7;
  --brand-soft: #EDF3FF;
  --teal: #0FA38A;
  --amber: #F2A33C;
  --bg: #F7F9FC;
  --ink: #17233B;
  --ink-soft: #5A6A85;
  --line: #E4EAF2;
  --radius-card: 16px;
  --shadow-card: 0 2px 12px rgba(23, 35, 59, 0.06);
  --shadow-hover: 0 16px 32px rgba(23, 35, 59, 0.10);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.75;
  font-size: 16px;
}
img, svg, video { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }
input, textarea, select { font-family: inherit; }

.container-x {
  max-width: 80rem;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1rem;
  padding-right: 1rem;
}
@media (min-width: 768px) {
  .container-x { padding-left: 1.5rem; padding-right: 1.5rem; }
}

/* Nav card */
.nav-card { box-shadow: var(--shadow-card); }
.nav-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.7rem;
  border-radius: 0.75rem;
  transition: all .2s ease;
}
.nav-item .nav-icon {
  width: 24px; height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: var(--brand-soft);
  color: var(--brand);
  font-size: 11px;
  transition: all .2s ease;
}
.nav-item:hover .nav-icon,
.nav-item.active .nav-icon {
  background: var(--brand);
  color: #fff;
}
.nav-item:hover,
.nav-item.active {
  background: var(--brand-soft);
}

/* Card */
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-card); box-shadow: var(--shadow-card); }
.card-hover { transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease; }
.card-hover:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: #D8E1EC; }

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  background: var(--brand);
  color: #fff;
  border-radius: 0.75rem;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  min-height: 44px;
  box-shadow: 0 4px 12px rgba(47, 107, 255, .25);
  transition: all .2s ease;
}
.btn-primary:hover { background: var(--brand-deep); box-shadow: 0 8px 18px rgba(47, 107, 255, .32); transform: translateY(-1px); }
.btn-primary:active { transform: scale(.97); }
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  background: rgba(255, 255, 255, .9);
  border: 1px solid #DCE4EC;
  color: #3D4C63;
  border-radius: 0.75rem;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  min-height: 44px;
  transition: all .2s ease;
}
.btn-secondary:hover { border-color: var(--brand); color: var(--brand); background: #fff; box-shadow: var(--shadow-card); }
.btn-secondary:active { transform: scale(.97); }
.btn-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--brand);
  font-weight: 600;
  transition: gap .2s ease, color .2s ease;
}
.btn-card-link:hover { gap: 12px; color: var(--brand-deep); }

/* Badge / eyebrow */
.eyebrow-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--brand-soft);
  color: var(--brand);
  border-radius: 999px;
  padding: 0.25rem 0.85rem;
  font-size: 13px;
  font-weight: 600;
}
.badge-cat {
  display: inline-block;
  background: var(--brand-soft);
  color: var(--brand);
  font-size: 12px;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: 999px;
  letter-spacing: 0.02em;
}

/* Section spacing */
.section-pad { padding-top: 4rem; padding-bottom: 4rem; }
@media (min-width: 768px) {
  .section-pad { padding-top: 6rem; padding-bottom: 6rem; }
}
.divider-bottom { border-bottom: 1px solid var(--line); }

/* Hero */
.hero-soft {
  background: linear-gradient(135deg, var(--brand-soft) 0%, #F8FAFF 58%, #F7F9FC 100%);
}

/* Stats */
.stat-number { font-weight: 800; letter-spacing: -0.02em; color: var(--ink); }
.stat-label { color: var(--ink-soft); font-size: 13px; }

/* FAQ */
.faq-item { border-radius: 16px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow-card); }
.faq-item + .faq-item { margin-top: 0.85rem; }
.faq-item details > summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  cursor: pointer;
  min-height: 60px;
}
.faq-item details > summary::-webkit-details-marker { display: none; }
.faq-item summary .faq-num { color: var(--brand); font-weight: 700; font-size: 13px; letter-spacing: .05em; }
.faq-item summary .faq-q { flex: 1; font-weight: 600; color: var(--ink); }
.faq-item summary .faq-icon {
  width: 26px; height: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-soft);
  transition: all .15s ease;
  flex-shrink: 0;
}
.faq-item details[open] summary .faq-icon {
  transform: rotate(45deg);
  border-color: var(--brand);
  color: var(--brand);
  background: var(--brand-soft);
}
.faq-answer { padding: 0 1.25rem 1.1rem 3rem; color: var(--ink-soft); border-top: 1px solid var(--line); margin-top: 0; }

/* Horizontal scroll */
.scroll-x { scrollbar-width: thin; scrollbar-color: #CBD5E1 transparent; }
.scroll-x::-webkit-scrollbar { height: 5px; }
.scroll-x::-webkit-scrollbar-thumb { background: #CBD5E1; border-radius: 10px; }
.scroll-x::-webkit-scrollbar-track { background: transparent; }

/* focus access */
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
  border-radius: 8px;
}

/* CTA panel */
.cta-round {
  background: linear-gradient(120deg, #2F6BFF 0%, #1D4FD7 100%);
  border-radius: 28px;
  overflow: hidden;
  position: relative;
}

/* Footer */
.footer-link { color: var(--ink-soft); transition: color .2s ease; }
.footer-link:hover { color: var(--brand); }

/* Responsive */
@media (max-width: 767px) {
  body { font-size: 15px; }
  .section-pad { padding-top: 2.75rem; padding-bottom: 2.75rem; }
  .hero-card { aspect-ratio: 4 / 3; }
}

/* roulang page: article */
:root {
            --brand: #2F6BFF;
            --brand-deep: #1D4FD7;
            --brand-soft: #EDF3FF;
            --ink: #17233B;
            --ink-soft: #5A6A85;
            --line: #E4EAF2;
            --bg: #F7F9FC;
            --accent: #0FA38A;
            --shadow-card: 0 2px 12px rgba(23, 35, 59, 0.06);
            --shadow-hover: 0 16px 32px rgba(23, 35, 59, 0.10);
            --radius-lg: 1.25rem;
            --radius-md: 0.75rem;
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
            background-color: var(--bg);
            color: var(--ink);
            line-height: 1.75;
            margin: 0;
        }

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

        img,
        svg {
            display: inline-block;
            vertical-align: middle;
            max-width: 100%;
        }

        button {
            font-family: inherit;
            cursor: pointer;
        }

        .container-x {
            max-width: 80rem;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1rem;
            padding-right: 1rem;
        }

        .nav-card {
            box-shadow: 0 10px 30px rgba(23, 35, 59, 0.06);
        }

        .nav-item {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            padding: 0.5rem 0.65rem;
            border-radius: 0.8rem;
            transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
            min-height: 44px;
        }

        .nav-item .nav-icon {
            width: 34px;
            height: 34px;
            border-radius: 0.75rem;
            background-color: var(--brand-soft);
            color: var(--brand);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            transition: background-color 0.2s ease, color 0.2s ease;
        }

        .nav-item:hover .nav-icon {
            background-color: var(--brand);
            color: #fff;
        }

        .nav-item.active .nav-icon {
            background-color: var(--brand);
            color: #fff;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background-color: var(--brand);
            color: #ffffff;
            font-weight: 600;
            padding: 0.8rem 1.5rem;
            border-radius: 0.9rem;
            box-shadow: 0 8px 18px rgba(47, 107, 255, 0.22);
            transition: background-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
        }

        .btn-primary:hover {
            background-color: var(--brand-deep);
            box-shadow: 0 12px 24px rgba(47, 107, 255, 0.28);
        }

        .btn-primary:active {
            transform: scale(0.97);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background-color: rgba(255, 255, 255, 0.9);
            border: 1px solid var(--line);
            color: var(--ink);
            font-weight: 600;
            padding: 0.8rem 1.5rem;
            border-radius: 0.9rem;
            transition: border-color 0.2s ease, color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
        }

        .btn-secondary:hover {
            border-color: var(--brand);
            color: var(--brand);
            box-shadow: 0 8px 18px rgba(23, 35, 59, 0.06);
        }

        .btn-secondary:active {
            transform: scale(0.97);
        }

        .badge {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.3rem 0.85rem;
            border-radius: 999px;
            background-color: var(--brand-soft);
            color: var(--brand);
            font-size: 0.75rem;
            font-weight: 600;
            white-space: nowrap;
        }

        .card-hover {
            background-color: #ffffff;
            border-radius: var(--radius-lg);
            border: 1px solid #eef2f7;
            box-shadow: var(--shadow-card);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .card-hover:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }

        .footer-link {
            color: var(--ink-soft);
            transition: color 0.2s ease;
        }

        .footer-link:hover {
            color: var(--brand);
        }

        .article-body {
            font-size: 1.0625rem;
            line-height: 1.9;
            color: #26334d;
            word-break: break-word;
        }

        .article-body h2 {
            font-size: 1.75rem;
            line-height: 1.4;
            font-weight: 800;
            color: var(--ink);
            margin-top: 2.2rem;
            margin-bottom: 1rem;
            letter-spacing: -0.01em;
        }

        .article-body h3 {
            font-size: 1.35rem;
            line-height: 1.5;
            font-weight: 700;
            color: var(--ink);
            margin-top: 1.8rem;
            margin-bottom: 0.85rem;
        }

        .article-body p {
            margin-bottom: 1.35rem;
        }

        .article-body a {
            color: var(--brand);
            border-bottom: 1px solid rgba(47, 107, 255, 0.25);
            transition: border-color 0.2s ease, color 0.2s ease;
        }

        .article-body a:hover {
            color: var(--brand-deep);
            border-bottom-color: var(--brand);
        }

        .article-body ul,
        .article-body ol {
            margin: 1rem 0 1.5rem 1.4rem;
        }

        .article-body ul {
            list-style: disc;
        }

        .article-body ol {
            list-style: decimal;
        }

        .article-body li {
            margin-bottom: 0.45rem;
        }

        .article-body blockquote {
            border-left: 4px solid var(--brand);
            background-color: var(--brand-soft);
            padding: 1.1rem 1.3rem;
            border-radius: 0 0.9rem 0.9rem 0;
            margin: 1.6rem 0;
            color: #1f2d49;
        }

        .article-body blockquote p {
            margin-bottom: 0;
        }

        .article-body img {
            border-radius: 1rem;
            width: 100%;
            height: auto;
            object-fit: cover;
            margin: 1.75rem 0;
        }

        .faq-item {
            background: #ffffff;
            border: 1px solid #edf1f7;
            border-radius: 1rem;
            box-shadow: var(--shadow-card);
            margin-bottom: 0.9rem;
            overflow: hidden;
            transition: box-shadow 0.25s ease, border-color 0.25s ease;
        }

        .faq-item:hover {
            border-color: #d6e1ff;
            box-shadow: var(--shadow-hover);
        }

        .faq-item summary {
            display: flex;
            align-items: center;
            gap: 1rem;
            padding: 1.15rem 1.4rem;
            list-style: none;
            cursor: pointer;
            min-height: 56px;
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-item summary .faq-no {
            font-size: 0.85rem;
            font-weight: 800;
            color: var(--brand);
            background: var(--brand-soft);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 0.6rem;
            min-width: 2.2rem;
            height: 2.2rem;
            padding: 0 0.4rem;
        }

        .faq-item summary .faq-q {
            font-weight: 700;
            color: var(--ink);
            flex: 1;
            font-size: 1rem;
        }

        .faq-item summary .faq-icon {
            width: 2.1rem;
            height: 2.1rem;
            border-radius: 50%;
            background-color: #f0f3f8;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: var(--ink-soft);
            transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
        }

        .faq-item[open] summary .faq-icon {
            background-color: var(--brand);
            color: #ffffff;
            transform: rotate(180deg);
        }

        .faq-item[open] summary .faq-q {
            color: var(--brand);
        }

        .faq-a {
            padding: 0.1rem 1.4rem 1.3rem 4.6rem;
            color: var(--ink-soft);
            line-height: 1.8;
            font-size: 0.95rem;
            border-top: 1px dashed #e6ebf3;
        }

        .faq-a p {
            margin: 0.85rem 0 0;
        }

        .back-layer {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            opacity: 0.18;
        }

        .copy-arrow {
            transition: transform 0.2s ease;
            display: inline-block;
        }

        .group-link:hover .copy-arrow {
            transform: translateX(6px);
        }

        @media (max-width: 640px) {
            .container-x {
                padding-left: 0.9rem;
                padding-right: 0.9rem;
            }

            .nav-card .nav-item {
                justify-content: flex-start;
            }

            .faq-a {
                padding-left: 1.25rem;
            }
        }

/* roulang page: category1 */
:root {
  --brand: #2F6BFF;
  --brand-deep: #1D4FD7;
  --brand-soft: #EDF3FF;
  --accent: #0FA38A;
  --amber: #F2A33C;
  --ink: #17233B;
  --ink-soft: #5A6A85;
  --line: #E4EAF2;
  --bg: #F7F9FC;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}
* {
  box-sizing: border-box;
}
a {
  color: inherit;
  text-decoration: none;
}
img {
  display: block;
  max-width: 100%;
}
button {
  font-family: inherit;
}
.container-x {
  width: 100%;
  max-width: 80rem;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1rem;
  padding-right: 1rem;
}
@media (min-width: 768px) {
  .container-x {
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }
}
[id] {
  scroll-margin-top: 110px;
}
.nav-card {
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: 1.5rem;
  box-shadow: 0 2px 12px rgba(23, 35, 59, 0.06);
}
.nav-item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.5rem 0.7rem;
  border-radius: 0.85rem;
  color: var(--ink-soft);
  transition: background .25s, color .25s, box-shadow .25s;
}
.nav-item:hover {
  background: rgba(237, 243, 255, 0.55);
  color: var(--ink);
}
.nav-item.active {
  background: rgba(237, 243, 255, 0.7);
  color: var(--ink);
}
.nav-icon {
  width: 1.75rem;
  height: 1.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.6rem;
  background: var(--brand-soft);
  color: var(--brand);
  font-size: 0.78rem;
  transition: background .25s, color .25s, box-shadow .25s;
}
.nav-item:hover .nav-icon {
  background: var(--brand);
  color: #fff;
}
.nav-item.active .nav-icon {
  background: var(--brand);
  color: #fff;
  box-shadow: 0 4px 10px rgba(47, 107, 255, 0.24);
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  min-height: 48px;
  padding: 0.75rem 1.5rem;
  border-radius: 0.95rem;
  background: var(--brand);
  color: #fff;
  font-weight: 600;
  box-shadow: 0 6px 18px rgba(47, 107, 255, 0.22);
  transition: background .25s, box-shadow .25s, transform .2s;
}
.btn-primary:hover {
  background: var(--brand-deep);
  box-shadow: 0 12px 24px rgba(47, 107, 255, 0.28);
  transform: translateY(-2px);
}
.btn-primary:active {
  transform: scale(.97);
}
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0.75rem 1.5rem;
  border-radius: 0.95rem;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(228, 234, 242, 0.9);
  color: var(--ink-soft);
  font-weight: 600;
  transition: border .25s, color .25s, transform .2s, background .25s;
}
.btn-secondary:hover {
  border-color: var(--brand);
  color: var(--brand);
  background: #fff;
  transform: translateY(-2px);
}
.btn-secondary:active {
  transform: scale(.97);
}
.btn-white {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0.75rem 1.5rem;
  border-radius: 0.95rem;
  background: #fff;
  color: var(--brand-deep);
  font-weight: 700;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
  transition: transform .2s, box-shadow .25s;
}
.btn-white:hover {
  transform: translateY(-2px) scale(1.01);
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.16);
}
.card-base {
  background: #fff;
  border: 1px solid rgba(228, 234, 242, 0.85);
  border-radius: 1.5rem;
  box-shadow: 0 2px 12px rgba(23, 35, 59, 0.06);
}
.card-lift {
  transition: transform .3s ease, box-shadow .3s ease;
}
.card-lift:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 32px rgba(23, 35, 59, 0.1);
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  background: var(--brand-soft);
  color: var(--brand);
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brand);
}
.footer-link {
  color: var(--ink-soft);
  transition: color .25s;
}
.footer-link:hover {
  color: var(--brand);
}
.faq-card {
  background: #fff;
  border: 1px solid rgba(228, 234, 242, 0.8);
  border-radius: 1.25rem;
  box-shadow: 0 2px 10px rgba(23, 35, 59, 0.04);
  overflow: hidden;
  transition: box-shadow .25s, border-color .25s;
}
.faq-card:hover {
  border-color: rgba(47, 107, 255, 0.3);
  box-shadow: 0 10px 24px rgba(23, 35, 59, 0.08);
}
.faq-card summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.1rem 1.25rem;
  font-weight: 600;
  color: var(--ink);
}
.faq-card summary::-webkit-details-marker {
  display: none;
}
.faq-card .faq-num {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--brand);
  background: var(--brand-soft);
  border-radius: 0.6rem;
  width: 2.4rem;
  height: 2.4rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.faq-card .faq-chevron {
  margin-left: auto;
  font-size: 0.9rem;
  color: var(--ink-soft);
  transition: transform .18s ease, color .18s ease;
}
.faq-card[open] .faq-chevron {
  transform: rotate(180deg);
  color: var(--brand);
}
.faq-answer {
  padding: 0.1rem 1.25rem 1.25rem 4.65rem;
  color: var(--ink-soft);
  font-size: 0.95rem;
}
#mobileMenu .nav-item {
  width: 100%;
  justify-content: flex-start;
}
@media (max-width: 1023px) {
  .btn-primary, .btn-secondary, .btn-white {
    min-height: 44px;
    padding: 0.6rem 1.15rem;
  }
}
.hero-image-card {
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.7);
  box-shadow: 0 18px 40px rgba(23, 35, 59, 0.1);
  backdrop-filter: blur(8px);
}
.metric-card {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}
.metric-icon {
  width: 2.5rem;
  height: 2.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.8rem;
  background: var(--brand-soft);
  color: var(--brand);
  font-size: 1rem;
  flex-shrink: 0;
}
.workflow-card {
  background: #fff;
  border: 1px solid rgba(228, 234, 242, 0.9);
  border-radius: 1.25rem;
  padding: 1.5rem;
  position: relative;
  transition: transform .3s, box-shadow .3s, border-color .3s;
}
.workflow-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 16px 30px rgba(23, 35, 59, 0.08);
  border-color: rgba(47, 107, 255, 0.26);
}

/* roulang page: category2 */
:root {
    --brand: #2F6BFF;
    --brand-deep: #1D4FD7;
    --brand-soft: #EDF3FF;
    --green: #0FA38A;
    --amber: #F2A33C;
    --bg: #F7F9FC;
    --card: #FFFFFF;
    --ink: #17233B;
    --ink-soft: #5A6A85;
    --line: #E4EAF2;
    --radius-lg: 1.5rem;
    --radius-md: 1rem;
    --radius-sm: 0.75rem;
    --shadow-sm: 0 2px 12px rgba(23, 35, 59, 0.06);
    --shadow-md: 0 8px 24px rgba(23, 35, 59, 0.08);
    --shadow-hover: 0 16px 32px rgba(23, 35, 59, 0.10);
  }

  * {
    box-sizing: border-box;
  }

  html {
    scroll-behavior: smooth;
  }

  body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
    background: var(--bg);
    color: var(--ink);
    margin: 0;
    line-height: 1.75;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
  }

  a,
  a:hover,
  a:focus {
    text-decoration: none;
    color: inherit;
  }

  img {
    max-width: 100%;
    display: block;
  }

  button {
    font-family: inherit;
  }

  .container-x {
    max-width: 80rem;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .nav-card {
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: 1.25rem;
    box-shadow: 0 10px 32px rgba(47, 107, 255, 0.08);
  }

  .nav-item {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    height: 2.75rem;
    min-height: 44px;
    padding: 0 0.625rem;
    border-radius: 0.75rem;
    color: #5A6A85;
    transition: all 0.25s ease;
  }

  .nav-item .nav-icon {
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 0.5rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--brand-soft);
    color: var(--brand);
    font-size: 0.7rem;
    flex: 0 0 auto;
    transition: all 0.25s ease;
  }

  .nav-item:hover {
    color: #17233B;
    background: #F1F5F9;
  }

  .nav-item:hover .nav-icon {
    background: var(--brand);
    color: #fff;
  }

  .nav-item.active {
    color: #17233B;
    background: #EDF1F7;
  }

  .nav-item.active .nav-icon {
    background: var(--brand);
    color: #fff;
  }

  .btn-primary,
  .btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    border-radius: 0.75rem;
    font-weight: 600;
    min-height: 44px;
    padding-left: 1.25rem;
    padding-right: 1.25rem;
    transition: all 0.25s ease;
  }

  .btn-primary {
    color: #fff;
    background: var(--brand);
    box-shadow: 0 6px 16px rgba(47, 107, 255, 0.25);
  }

  .btn-primary:hover {
    background: var(--brand-deep);
    box-shadow: 0 10px 20px rgba(47, 107, 255, 0.3);
  }

  .btn-primary:active {
    transform: scale(0.97);
  }

  .btn-secondary {
    color: #334155;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid #DCE4EF;
  }

  .btn-secondary:hover {
    border-color: var(--brand);
    color: var(--brand);
  }

  .btn-secondary:active {
    transform: scale(0.97);
  }

  .eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--brand-soft);
    color: var(--brand-deep);
    border-radius: 999px;
    padding: 0.35rem 0.9rem;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.02em;
  }

  .section-gap {
    padding: 4.5rem 0;
  }

  @media (min-width: 768px) {
    .section-gap {
      padding: 6rem 0;
    }
  }

  .hero-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    background: rgba(255, 255, 255, 0.88);
    border: 1px solid #E4EAF2;
    border-radius: 999px;
    padding: 0.3rem 0.9rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: #334155;
  }

  .hero-chip i {
    color: var(--brand);
  }

  .hero-img-card {
    box-shadow: 0 22px 50px rgba(23, 35, 59, 0.14);
  }

  .soft-panel {
    background: #FFFFFF;
    border-radius: 1.5rem;
    border: 1px solid #E4EAF2;
    box-shadow: 0 10px 28px rgba(47, 107, 255, 0.06);
  }

  .soft-panel-hover {
    transition: all 0.3s ease;
  }

  .soft-panel-hover:hover {
    transform: translateY(-6px);
    box-shadow: 0 18px 40px rgba(23, 35, 59, 0.10);
  }

  .feature-icon {
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.05rem;
    color: var(--brand);
    background: var(--brand-soft);
  }

  .feature-tag {
    display: inline-flex;
    align-items: center;
    padding: 0.3rem 0.8rem;
    border-radius: 999px;
    background: #F1F5F9;
    font-size: 0.75rem;
    font-weight: 600;
    color: #5A6A85;
  }

  .mini-stat {
    background: #F8FAFD;
    border: 1px solid #E4EAF2;
    border-radius: 1rem;
    padding: 0.85rem 1rem;
  }

  .step-num {
    width: 2.5rem;
    height: 2.5rem;
    background: var(--brand-soft);
    color: var(--brand);
    border-radius: 1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.9rem;
  }

  .step-line::before {
    content: "";
    position: absolute;
    top: 3rem;
    left: 1.25rem;
    right: auto;
    width: calc(100% - 1.25rem);
    height: 2px;
    background: #DDE6F5;
  }

  .scene-card .scene-image {
    transition: transform 0.45s ease;
  }

  .scene-card:hover .scene-image {
    transform: scale(1.04);
  }

  .field-list li {
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
    color: #334155;
  }

  .field-list li i {
    color: var(--green);
    margin-top: 0.4rem;
    font-size: 0.9rem;
  }

  .blockquote-line {
    border-left: 4px solid var(--brand);
    background: var(--brand-soft);
    border-radius: 0 1rem 1rem 0;
    padding: 1.1rem 1.35rem;
    color: #26385C;
  }

  .faq-card {
    border: 1px solid #E4EAF2;
    background: #fff;
    border-radius: 1.25rem;
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(23, 35, 59, 0.04);
  }

  .faq-card summary {
    display: grid;
    grid-template-columns: 3.5rem 1fr 2.5rem;
    align-items: center;
    padding: 1.25rem 1.5rem;
    cursor: pointer;
    list-style: none;
    min-height: 72px;
  }

  .faq-card summary::-webkit-details-marker {
    display: none;
  }

  .faq-index {
    font-weight: 800;
    color: #9AA6BC;
    font-size: 0.9rem;
    letter-spacing: 0.04em;
  }

  .faq-question {
    font-size: 1rem;
    font-weight: 700;
    color: #17233B;
    line-height: 1.5;
  }

  .faq-arrow {
    width: 2.25rem;
    height: 2.25rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 9999px;
    background: #F1F5F9;
    color: #68768E;
    transition: all 0.2s ease;
  }

  .faq-card[open] .faq-arrow {
    background: var(--brand-soft);
    color: var(--brand);
    transform: rotate(180deg);
  }

  .faq-answer {
    padding: 0 1.5rem 1.5rem 5rem;
    color: #5A6A85;
    font-size: 0.95rem;
  }

  .cta-banner {
    background: linear-gradient(135deg, var(--brand) 0%, #4C83FF 48%, #6E9CFF 100%);
    box-shadow: 0 24px 50px rgba(47, 107, 255, 0.26);
    overflow: hidden;
  }

  .cta-banner:after {
    content: "";
    position: absolute;
    width: 16rem;
    height: 16rem;
    border: 45px solid rgba(255, 255, 255, 0.12);
    border-radius: 999px;
    right: -4rem;
    bottom: -5rem;
  }

  .footer-link {
    color: #475569;
    transition: color 0.2s ease;
  }

  .footer-link:hover {
    color: var(--brand);
  }

  a:focus-visible {
    outline: 3px solid rgba(47, 107, 255, 0.35);
    outline-offset: 3px;
    border-radius: 0.5rem;
  }

  @media (max-width: 640px) {
    .step-grid {
      grid-template-columns: 1fr;
      gap: 1rem;
    }

    .step-line::before {
      display: none;
    }

    .faq-card summary {
      grid-template-columns: 2.5rem 1fr 2rem;
      padding: 1.1rem 0.9rem;
    }

    .faq-answer {
      padding: 0 0.9rem 1.1rem 2.4rem;
    }

    .container-x {
      padding-left: 1rem;
      padding-right: 1rem;
    }
  }

/* roulang page: category3 */
:root {
  --brand: #2F6BFF;
  --brand-deep: #1D4FD7;
  --brand-soft: #EDF3FF;
  --accent-teal: #0FA38A;
  --accent-amber: #F2A33C;
  --ink: #17233B;
  --ink-soft: #5A6A85;
  --line: #E4EAF2;
  --body-bg: #F7F9FC;
  --radius-lg: 1rem;
  --radius-2xl: 1.25rem;
  --shadow-card: 0 2px 12px rgba(23, 35, 59, 0.06);
  --shadow-hover: 0 16px 32px rgba(23, 35, 59, 0.10);
}

html { scroll-behavior: smooth; }

body {
  background: var(--body-bg);
  color: var(--ink);
  font-family: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  line-height: 1.75;
  font-size: 16px;
}

*,
*::before,
*::after { box-sizing: border-box; }

img { display: block; max-width: 100%; }

a { color: inherit; text-decoration: none; }
a:focus-visible,
button:focus-visible,
summary:focus-visible { outline: 3px solid rgba(47, 107, 255, 0.35); outline-offset: 3px; border-radius: 10px; }

.container-x {
  width: 100%;
  max-width: 80rem;
  margin-inline: auto;
  padding-inline: 1.25rem;
}

@media (min-width: 768px) {
  .container-x { padding-inline: 1.5rem; }
}

.nav-card {
  box-shadow: var(--shadow-card);
}

.nav-item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.55rem;
  border-radius: 0.85rem;
  transition: background 0.3s ease, color 0.3s ease, transform 0.2s ease;
  color: #5A6A85;
}

.nav-item.active { background: #ffffff; color: var(--brand); box-shadow: 0 2px 10px rgba(23,35,59,0.05); }

.nav-item:hover { color: var(--brand); background: #F3F6FC; }

.nav-icon {
  width: 34px;
  height: 34px;
  border-radius: 12px;
  background: var(--brand-soft);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.88rem;
  color: var(--brand);
  transition: background 0.3s ease, color 0.3s ease;
}

.nav-item:hover .nav-icon { background: var(--brand); color: #fff; }
.nav-item.active .nav-icon { background: var(--brand); color: #fff; }

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  border-radius: 0.9rem;
  background: var(--brand);
  padding: 0.85rem 1.5rem;
  font-weight: 600;
  color: #ffffff;
  box-shadow: 0 8px 18px rgba(47, 107, 255, 0.18);
  transition: all 0.3s ease;
  min-height: 44px;
  border: none;
}

.btn-primary:hover { background: var(--brand-deep); box-shadow: 0 14px 26px rgba(47,107,255,0.25); transform: translateY(-2px); }
.btn-primary:active { transform: scale(0.97); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  border-radius: 0.9rem;
  background: rgba(255,255,255,0.9);
  border: 1px solid #DDE5EF;
  color: #334155;
  padding: 0.85rem 1.5rem;
  font-weight: 600;
  transition: all 0.3s ease;
  min-height: 44px;
}

.btn-secondary:hover { border-color: var(--brand); color: var(--brand); background: #ffffff; transform: translateY(-2px); box-shadow: 0 10px 22px rgba(23,35,59,0.08); }

.card-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border-radius: 999px;
  background: #F1F5FB;
  padding: 0.28rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: #475569;
  letter-spacing: 0.02em;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--brand);
  font-weight: 700;
  font-size: 0.88rem;
  letter-spacing: 0.08em;
}

.cover-mask {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(to top, rgba(23, 35, 59, 0.55), rgba(23, 35, 59, 0.05) 75%);
}

.card-hover {
  transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.card-hover:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.footer-link { color: #475569; transition: color 0.25s ease; }
.footer-link:hover { color: var(--brand); }

.faq-item {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 1.1rem;
  padding: 1.1rem 1.3rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.faq-item[open] { border-color: rgba(47,107,255,0.35); box-shadow: var(--shadow-card); }

.faq-item summary {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 1rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--ink);
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary .faq-num { color: var(--brand); font-weight: 800; font-size: 0.85rem; }

.faq-item summary .faq-title { flex: 1; font-size: 1rem; }

.faq-item .fa-chevron-down { color: #94A3B8; transition: 0.2s ease; }

.faq-item[open] .fa-chevron-down { transform: rotate(180deg); color: var(--brand); }

.faq-item .faq-answer { padding: 0.9rem 0 0 2.1rem; color: #5A6A85; font-size: 0.95rem; border-top: 1px dashed var(--line); margin-top: 0.75rem; }

@media (max-width: 640px) {
  .faq-item { padding: 1rem; }
  .faq-item .faq-answer { padding-left: 0; }
}

.hero-bg {
  background-image: linear-gradient(135deg, #EDF3FF 0%, #FFFFFF 65%, #F8FAFC 100%);
}

@media (max-width: 1024px) {
  body { line-height: 1.7; }
}