/* roulang page: index */
:root {
  --bg-sand: #f6f4ef;
  --bg-white: #ffffff;
  --ink: #151614;
  --muted: #6b6b66;
  --brand: #c3521a;
  --brand-light: #d87332;
  --brand-dark: #a64416;
  --line: rgba(21, 22, 20, 0.08);
  --coal: #131412;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --shadow-card: 0 18px 40px -18px rgba(21, 22, 20, 0.16);
  --shadow-card-hover: 0 26px 60px -24px rgba(21, 22, 20, 0.24);
  --transition: all 0.22s ease-out;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg-sand);
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}

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

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

button,
input,
textarea {
  font-family: inherit;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid rgba(216, 115, 50, 0.45);
  outline-offset: 3px;
}

::selection {
  background: rgba(195, 82, 26, 0.16);
}

.eyebrow {
  font-size: 13px;
  letter-spacing: 0.18em;
  font-weight: 700;
  color: var(--brand-light);
  text-transform: none;
}

.eyebrow-light {
  color: #d9a07f;
}

.eyebrow-ink {
  color: var(--brand-dark);
}

.app-content {
  width: 100%;
}

.container-page {
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

@media (min-width: 640px) {
  .container-page {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  border-radius: 999px;
  padding: 0.875rem 1.5rem;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  transition: var(--transition);
  background: none;
  border: 0;
}

.btn-primary {
  background: var(--brand);
  color: #fff;
  box-shadow: 0 14px 28px -16px rgba(195, 82, 26, 0.8);
}

.btn-primary:hover {
  background: var(--brand-dark);
  transform: translateY(-1px);
  box-shadow: 0 18px 32px -16px rgba(195, 82, 26, 0.75);
}

.btn-dark {
  background: var(--coal);
  color: #fff;
  box-shadow: 0 14px 28px -18px rgba(21, 22, 20, 0.7);
}

.btn-dark:hover {
  background: #262725;
  transform: translateY(-1px);
}

.btn-outline {
  border: 1px solid rgba(255, 255, 255, 0.5);
  color: #fff;
}

.btn-outline:hover {
  border-color: #fff;
  background: rgba(255, 255, 255, 0.08);
  transform: translateY(-1px);
}

.btn-outline-ink {
  border: 1px solid rgba(21, 22, 20, 0.3);
  color: var(--ink);
}

.btn-outline-ink:hover {
  border-color: var(--brand);
  color: var(--brand-dark);
  background: rgba(195, 82, 26, 0.03);
  transform: translateY(-1px);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(195, 82, 26, 0.08);
  color: var(--brand-dark);
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
  padding: 0.5rem 0.7rem;
  border-radius: 999px;
  border: 1px solid rgba(195, 82, 26, 0.12);
}

.badge-white {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.16);
}

.no-scrollbar::-webkit-scrollbar {
  display: none;
}

.no-scrollbar {
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.video-card {
  border-radius: 22px;
  background: #fff;
  transition: transform 0.22s ease-out, box-shadow 0.22s ease-out;
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

.video-card .video-frame {
  overflow: hidden;
  border-radius: 18px;
}

.video-card .video-frame img {
  transition: transform 0.35s ease;
}

.video-card:hover .video-frame img {
  transform: scale(1.05);
}

.video-card .time-bar {
  position: absolute;
  left: 12%;
  right: 12%;
  bottom: 18px;
  height: 2px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  overflow: hidden;
}

.video-card .time-bar span {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 28%;
  background: var(--brand-light);
  border-radius: 999px;
}

.cms-item {
  border-bottom: 1px solid var(--line);
  transition: background 0.18s ease;
  position: relative;
}

.cms-item:last-child {
  border-bottom: 0;
}

.cms-item:hover {
  background: rgba(195, 82, 26, 0.025);
}

.cms-item .cms-title {
  transition: color 0.2s ease;
}

.cms-item:hover .cms-title {
  color: var(--brand-dark);
}

.cms-item .arrow {
  opacity: 0;
  transform: translateX(-6px);
  transition: all 0.2s ease;
  color: var(--brand-dark);
}

.cms-item:hover .arrow {
  opacity: 1;
  transform: translateX(0);
}

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 1.5rem 0.5rem 1.5rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-weight: 700;
  font-size: 17px;
  color: var(--ink);
  transition: color 0.2s ease;
}

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

.faq-item summary .faq-icon {
  position: relative;
  width: 24px;
  height: 24px;
  flex: 0 0 24px;
  border-radius: 50%;
  border: 1px solid rgba(21, 22, 20, 0.22);
}

.faq-item summary .faq-icon:before,
.faq-item summary .faq-icon:after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 10px;
  height: 1.6px;
  background: var(--ink);
  transform: translate(-50%, -50%);
  transition: all 0.2s ease;
}

.faq-item summary .faq-icon:after {
  transform: translate(-50%, -50%) rotate(90deg);
}

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

.faq-item[open] summary .faq-icon {
  border-color: rgba(195, 82, 26, 0.4);
  background: rgba(195, 82, 26, 0.05);
}

.faq-item[open] summary .faq-icon:after {
  transform: translate(-50%, -50%) rotate(0deg);
}

.faq-item .faq-body {
  padding: 0 2.5rem 1.5rem 0.5rem;
  color: var(--muted);
  line-height: 1.9;
}

.sidebar-nav .nav-item {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
  padding: 0.8rem 0.85rem;
  margin-bottom: 0.25rem;
  border-radius: 14px;
  color: rgba(255, 255, 255, 0.68);
  transition: all 0.2s ease;
}

.sidebar-nav .nav-item .active-dot {
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 18px;
  background: var(--brand-light);
  border-radius: 99px;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.sidebar-nav .nav-item:hover {
  background: rgba(255, 255, 255, 0.04);
  color: #fff;
}

.sidebar-nav .nav-item.is-active {
  background: rgba(255, 255, 255, 0.05);
  color: #fff;
}

.sidebar-nav .nav-item.is-active .active-dot {
  opacity: 1;
}

.cms-list-area {
  border: 2px dashed rgba(21, 22, 20, 0.12);
  border-radius: 20px;
  padding: 3rem 1.5rem;
  text-align: center;
  color: var(--muted);
}

.cta-panel {
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0)),
    var(--coal);
  border-radius: 36px;
}

.cta-panel::after {
  content: "";
  display: block;
  width: 88px;
  height: 3px;
  margin-top: 1.6rem;
  background: var(--brand-light);
  border-radius: 99px;
}

.cta-panel h2 {
  margin-bottom: 0.5rem;
}

.hero-copy-marker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.82);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  border-radius: 99px;
  padding: 0.45rem 0.8rem;
}

.hero-bg {
  background-image: url('/assets/images/backpic/back-1.webp');
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
}

.hero-mask {
  background: linear-gradient(180deg, rgba(19, 20, 18, 0.82), rgba(19, 20, 18, 0.78) 55%, rgba(19, 20, 18, 0.88));
}

#mobileDrawer {
  display: none;
}

#mobileDrawer.open {
  display: block;
}

#mobileDrawer .drawer-panel {
  transform: translateX(-100%);
  transition: transform 0.26s ease;
}

#mobileDrawer.open .drawer-panel {
  transform: translateX(0);
}

@media (min-width: 1024px) {
  .app-content {
    padding-left: 248px;
  }
}

/* roulang page: category1 */
:root {
  --bg: #F6F4EF;
  --bg-card: #FFFFFF;
  --text-main: #151614;
  --text-muted: #6b6b66;
  --border-light: rgba(21,22,20,0.08);
  --primary: #d87332;
  --primary-dark: #c3521a;
  --radius: 20px;
  --radius-lg: 28px;
  --shadow: 0 4px 20px rgba(21,22,20,0.05);
  --shadow-lg: 0 18px 40px rgba(21,22,20,0.1);
  --ease: 200ms ease-out;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: "PingFang SC","Microsoft YaHei","Helvetica Neue",sans-serif; background: var(--bg); color: var(--text-main); line-height: 1.85; font-size: 16px; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; transition: color var(--ease); }
button { font-family: inherit; cursor: pointer; }

.container-page { width: 100%; max-width: 1320px; margin: 0 auto; padding-left: 24px; padding-right: 24px; }

/* App shell layout */
.app-shell { display: flex; min-height: 100vh; }
.sidebar {
  width: 248px; flex-shrink: 0; background: #131412; color: rgba(255,255,255,0.6);
  display: flex; flex-direction: column; position: fixed; top: 0; bottom: 0; left: 0; z-index: 50;
}
.main-content { flex: 1; margin-left: 248px; display: flex; flex-direction: column; min-width: 0; }

/* Sidebar nav */
.brand-logo { display: flex; align-items: center; gap: 12px; padding: 28px 24px 12px; }
.brand-mark {
  width: 42px; height: 42px; border-radius: 14px; background: #d87332; color: #fff;
  display: flex; align-items: center; justify-content: center; font-size: 20px; font-weight: 700; flex-shrink: 0;
}
.brand-name { font-weight: 700; font-size: 17px; color: #fff; line-height: 1.4; }
.brand-sub { font-size: 11px; color: rgba(255,255,255,0.35); letter-spacing: 0.02em; }
.sidebar-nav { padding: 20px 0 0 0; display: flex; flex-direction: column; }
.nav-item {
  display: flex; align-items: center; gap: 12px; padding: 14px 24px;
  color: rgba(255,255,255,0.6); font-weight: 500; transition: color var(--ease), background var(--ease);
  border-left: 2px solid transparent; font-size: 14px;
}
.nav-item:hover { color: #fff; background: rgba(255,255,255,0.04); }
.nav-item.is-active { color: #fff; border-left-color: #d87332; background: linear-gradient(90deg, rgba(216,115,50,0.12), transparent 75%); }
.nav-item.is-active .active-dot { opacity: 1; }
.active-dot { width: 4px; height: 4px; border-radius: 50%; background: #d87332; opacity: 0; flex-shrink: 0; }
.sidebar-foot { margin-top: auto; padding: 20px 24px 28px; border-top: 1px solid rgba(255,255,255,0.06); }
.sidebar-foot small { font-size: 12px; color: rgba(255,255,255,0.28); line-height: 1.8; display: block; }

/* Mobile top bar */
.mobile-top { display: none; background: #fff; border-bottom: 1px solid var(--border-light); position: sticky; top: 0; z-index: 40; }
.mobile-menu-btn, .mobile-close-btn { width: 42px; height: 42px; display: flex; align-items: center; justify-content: center; border: 0; background: transparent; color: #151614; }
.mobile-close-btn { color: #fff; position: absolute; top: 14px; right: 10px; width: 38px; height: 38px; }
.mobile-overlay { display: none; }
.drawer-menu {
  position: fixed; top: 0; left: 0; width: 272px; height: 100%; background: #131412;
  transform: translateX(-100%); transition: transform 250ms ease; z-index: 90; color: #fff;
}
.drawer-menu.open { transform: translateX(0); }
.drawer-close-area {
  display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.4); z-index: 80;
}
.drawer-close-area.open { display: block; }
.drawer-nav { padding: 70px 8px 30px 0; }
.drawer-nav .nav-item { color: rgba(255,255,255,0.7); padding-left: 20px; }
.drawer-nav .nav-item.is-active { color: #d87332; }
.shadow-bar { box-shadow: 0 6px 24px rgba(0,0,0,0.06); }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; border-radius: 10px; font-weight: 600; text-align: center; transition: all 200ms ease; line-height: 1; border: 0; cursor: pointer; }
.btn-lg { padding: 15px 30px; font-size: 15px; }
.btn-md { padding: 12px 24px; font-size: 14px; }
.btn-primary { background: #C3521A; color: #fff; box-shadow: 0 4px 16px rgba(195,82,26,0.18); }
.btn-primary:hover { background: #B04412; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(195,82,26,0.28); }
.btn-outline-light { border: 1px solid rgba(255,255,255,0.4); color: #151614; background: transparent; transition: all var(--ease); }
.btn-outline-light:hover { border-color: #C3521A; color: #C3521A; background: rgba(216,115,50,0.05); }
.btn-outline-dark { border: 1px solid #151614; color: #151614; background: transparent; transition: all var(--ease); }
.btn-outline-dark:hover { background: #151614; color: #fff; }
.btn-light { background: #fff; color: #151614; }
.btn-light:hover { background: #F6F4EF; transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,0,0,0.1); }
.btn-orange-light { background: #d87332; color: #fff; }
.btn-orange-light:hover { background: #151614; color: #fff; transform: translateY(-2px); }

/* Eyebrow / section headers */
.eyebrow { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 600; letter-spacing: 0.14em; color: #C3521A; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 20px; height: 1px; background: #C3521A; display: inline-block; }
.badge { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 600; color: #C3521A; background: rgba(216,115,50,0.1); border-radius: 20px; padding: 6px 14px; letter-spacing: 0.04em; }

/* Cards */
.card { background: var(--bg-card); border-radius: var(--radius); transition: transform 200ms ease, box-shadow 200ms ease; }
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.step-card { background: #fff; border-radius: 20px; border: 1px solid #eeeae3; transition: all 200ms ease; }
.step-card:hover { border-color: rgba(216,115,50,0.4); box-shadow: 0 12px 28px rgba(21,22,20,0.08); }

/* misc */
.divider-h { border: 0; border-top: 1px solid var(--border-light); margin: 0; }
.hover-up { transition: transform 200ms ease, box-shadow 200ms ease, background 200ms ease; }
.hover-up:hover { transform: translateY(-3px); box-shadow: 0 18px 40px rgba(21,22,20,0.07); }
.img-cover { width: 100%; height: 100%; object-fit: cover; display: block; }
.transition-all-200 { transition: all 200ms ease-out; }

/* Focus */
a:focus-visible, button:focus-visible, .nav-item:focus-visible { outline: 2px solid #d87332; outline-offset: 2px; border-radius: 6px; }

/* responsive */
@media (max-width: 1023px) {
  .sidebar { display: none; }
  .main-content { margin-left: 0; }
  .mobile-top { display: flex; align-items: center; justify-content: space-between; height: 62px; padding: 0 16px; }
  .mobile-badge-btn { margin-left: 12px; }
}

/* roulang page: article */
:root {
    --bg: #f6f4ef;
    --surface: #ffffff;
    --ink: #151614;
    --muted: #6b6b66;
    --line: rgba(21, 22, 20, .08);
    --brand: #c3521a;
    --brand-dark: #a84412;
    --coal: #131412;
    --radius: 22px;
    --shadow: 0 24px 60px rgba(21, 22, 20, .06);
  }

  * {
    box-sizing: border-box;
  }

  html {
    scroll-behavior: smooth;
  }

  body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.85;
    -webkit-font-smoothing: antialiased;
  }

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

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

  button,
  input,
  textarea,
  select {
    font: inherit;
  }

  .container-page {
    width: 100%;
    max-width: 1360px;
    margin-right: auto;
    margin-left: auto;
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }

  .article-wrap {
    width: 100%;
    max-width: 1180px;
    margin-right: auto;
    margin-left: auto;
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }

  .sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 80;
    display: flex;
    width: 268px;
    flex-direction: column;
    background: var(--coal);
    color: rgba(255, 255, 255, .88);
    padding: 28px 20px 24px;
    transform: translateX(-100%);
    transition: transform .3s ease-out;
  }

  .main-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--bg);
  }

  .sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 30px;
  }

  .nav-item {
    position: relative;
    display: flex;
    align-items: center;
    gap: 12px;
    height: 46px;
    padding: 0 14px;
    border-radius: 12px;
    color: rgba(255, 255, 255, .62);
    font-size: 15px;
    font-weight: 500;
    letter-spacing: .02em;
    transition: background .2s ease, color .2s ease;
  }

  .nav-item .active-dot {
    position: absolute;
    left: -20px;
    top: 14px;
    bottom: 14px;
    width: 3px;
    border-radius: 3px;
    background: transparent;
    transition: background .2s ease;
  }

  .nav-item:hover {
    color: #fff;
    background: rgba(255, 255, 255, .07);
  }

  .nav-item.is-active {
    color: #f4b286;
    background: rgba(216, 115, 50, .09);
  }

  .nav-item.is-active .active-dot {
    background: #d87332;
  }

  .mobile-header {
    position: sticky;
    top: 0;
    z-index: 60;
    display: flex;
    height: 64px;
    align-items: center;
    justify-content: space-between;
    background: rgba(246, 244, 239, .92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line);
    padding-left: 16px;
    padding-right: 16px;
  }

  .app-backdrop {
    position: fixed;
    inset: 0;
    z-index: 75;
    background: rgba(0, 0, 0, .42);
    opacity: 0;
    pointer-events: none;
    transition: opacity .25s ease;
  }

  body.nav-open .sidebar {
    transform: translateX(0);
  }

  body.nav-open .app-backdrop {
    opacity: 1;
    pointer-events: auto;
  }

  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border-radius: 10px;
    padding: 12px 22px;
    font-size: 15px;
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform .2s ease, background .2s ease, border-color .2s ease, color .2s ease, box-shadow .2s ease;
  }

  .btn:hover {
    transform: translateY(-1px);
  }

  .btn:focus-visible,
  .nav-item:focus-visible,
  .icon-button:focus-visible {
    outline: 2px solid #d87332;
    outline-offset: 3px;
  }

  .btn-primary {
    background: var(--brand);
    color: #fff;
  }

  .btn-primary:hover {
    background: #b34712;
    box-shadow: 0 12px 30px rgba(195, 82, 26, .18);
  }

  .btn-dark {
    background: var(--coal);
    color: #fff;
  }

  .btn-dark:hover {
    background: #262621;
  }

  .btn-outline-dark {
    border-color: rgba(255, 255, 255, .25);
    color: #fff;
    background: transparent;
  }

  .btn-outline-dark:hover {
    border-color: #f4b286;
    color: #f4b286;
    background: rgba(255, 255, 255, .04);
  }

  .eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    letter-spacing: .12em;
    color: var(--brand);
    font-weight: 600;
    text-transform: uppercase;
  }

  .eyebrow-light {
    color: #f4b286;
  }

  .breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: #8a8a82;
  }

  .breadcrumb a {
    transition: color .2s;
  }

  .breadcrumb a:hover {
    color: var(--brand);
  }

  .article-card {
    background: #fff;
    border-radius: 26px;
    box-shadow: 0 18px 50px rgba(21, 22, 20, .05);
    padding: clamp(1.5rem, 3.5vw, 3.5rem);
  }

  .article-card h1 {
    margin: 18px 0 12px;
    font-size: clamp(1.9rem, 4vw, 3rem);
    line-height: 1.25;
    letter-spacing: -0.02em;
    font-weight: 800;
  }

  .article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 18px;
    align-items: center;
    color: #7a7a73;
    font-size: 14px;
    margin-top: 22px;
  }

  .article-meta .tag-label {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    background: #f7ede5;
    color: #b44d16;
    padding: 4px 12px;
    font-size: 13px;
    font-weight: 600;
  }

  .article-body {
    margin-top: 38px;
    font-size: 16px;
    line-height: 2;
    color: #282824;
    word-break: break-word;
  }

  .article-body > *:first-child {
    margin-top: 0;
  }

  .article-body p {
    margin: 0 0 24px;
  }

  .article-body h2 {
    font-size: 1.55rem;
    font-weight: 750;
    margin: 46px 0 18px;
    line-height: 1.4;
    color: #141412;
  }

  .article-body h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 34px 0 12px;
    color: #1d1c1a;
  }

  .article-body ul,
  .article-body ol {
    margin: 0 0 24px;
    padding-left: 1.3rem;
  }

  .article-body li {
    margin-bottom: 12px;
  }

  .article-body blockquote {
    margin: 30px 0;
    padding: 18px 22px;
    border-left: 4px solid #c3521a;
    background: rgba(195, 82, 26, .06);
    border-radius: 0 14px 14px 0;
    color: #4b4842;
  }

  .article-body img {
    border-radius: 18px;
    margin: 34px auto;
  }

  .article-body figure {
    margin: 36px 0;
  }

  .article-body figcaption {
    text-align: center;
    color: #8a8a82;
    font-size: 13px;
    margin-top: 8px;
  }

  .article-body pre {
    background: #1a1a17;
    color: #f1ece3;
    overflow: auto;
    padding: 20px;
    border-radius: 16px;
    line-height: 1.75;
    margin-bottom: 24px;
  }

  .article-body code {
    font-family: "SFMono-Regular", Consolas, monospace;
  }

  .article-body a {
    color: #b34c13;
    border-bottom: 1px solid rgba(179, 76, 19, .35);
    transition: border-color .2s;
  }

  .article-body a:hover {
    border-color: #b34c13;
  }

  .article-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 28px 0;
    font-size: 15px;
  }

  .article-body th,
  .article-body td {
    border: 1px solid rgba(21, 22, 20, .1);
    padding: 10px 14px;
    text-align: left;
  }

  .article-body th {
    background: rgba(21, 22, 20, .04);
    font-weight: 600;
  }

  .article-end {
    margin-top: 46px;
    padding-top: 24px;
    border-top: 1px solid var(--line);
  }

  .callout-band {
    position: relative;
    overflow: hidden;
    border-radius: 28px;
    background-color: #201b17;
    color: #fff;
    background-position: center;
    background-size: cover;
  }

  .callout-band::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(100deg, rgba(19, 18, 16, .96) 0%, rgba(19, 18, 16, .78) 54%, rgba(19, 18, 16, .62) 100%);
    pointer-events: none;
  }

  .callout-band > * {
    position: relative;
    z-index: 1;
  }

  .guide-card {
    display: block;
    overflow: hidden;
    background: #fff;
    border-radius: 20px;
    transition: transform .2s ease, box-shadow .2s ease;
  }

  .guide-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 28px 60px rgba(21, 22, 20, .09);
  }

  .guide-card .thumb-box {
    overflow: hidden;
    aspect-ratio: 4 / 3;
    background: #e9e5dd;
  }

  .guide-card .thumb-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .4s ease;
  }

  .guide-card:hover .thumb-box img {
    transform: scale(1.04);
  }

  .icon-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 12px;
    color: #191815;
    border: 1px solid rgba(21, 22, 20, .12);
    background: #fff;
    transition: background .2s, border-color .2s;
  }

  @media (min-width: 1024px) {
    .sidebar {
      transform: translateX(0);
    }

    .main-shell {
      margin-left: 268px;
    }

    .mobile-header {
      display: none;
    }
  }

  @media (max-width: 639px) {
    .article-card {
      border-radius: 20px;
      padding: 1.25rem;
    }

    .article-card h1 {
      font-size: 1.8rem;
    }

    .article-body {
      font-size: 15px;
      line-height: 1.95;
    }

    .callout-band {
      border-radius: 20px;
    }
  }

  .no-article-block {
    min-height: 460px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: #fff;
    border-radius: 26px;
    box-shadow: var(--shadow);
    padding: 40px 24px;
  }

/* roulang page: category2 */
:root {
  --bg: #F6F4EF;
  --surface: #FFFFFF;
  --ink: #151614;
  --muted: #6B6B66;
  --line: rgba(21, 22, 20, 0.09);
  --brand: #D87332;
  --brand-dark: #B9551F;
  --brand-soft: rgba(216, 115, 50, 0.10);
  --coal: #131412;
  --radius-xl: 26px;
  --radius-lg: 20px;
  --radius-md: 12px;
  --shadow-soft: 0 16px 40px rgba(21, 22, 20, 0.05);
  --shadow-hover: 0 22px 50px rgba(21, 22, 20, 0.10);
  --ease: all .22s ease-out;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.85;
}

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

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

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

.container-page {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding-left: 32px;
  padding-right: 32px;
}

@media (max-width: 767px) {
  .container-page {
    padding-left: 20px;
    padding-right: 20px;
  }
}

/* 左侧 App Shell */
.content-shell {
  margin-left: 248px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.sidebar {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 60;
  display: flex;
  flex-direction: column;
  width: 248px;
  padding: 24px 18px 20px;
  background: var(--coal);
  color: rgba(255, 255, 255, .72);
  transition: transform .28s ease;
  overflow-y: auto;
}

.sidebar-brand-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 8px 20px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  min-width: 0;
}

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--brand);
  color: #fff;
  font-size: 17px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
}

.brand-text {
  font-weight: 700;
  font-size: 16px;
  color: #fff;
  line-height: 1.4;
}

.brand-desc {
  font-size: 12px;
  color: rgba(255, 255, 255, .35);
  margin-top: 2px;
  letter-spacing: .04em;
}

.sidebar-close {
  display: none;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: 10px;
  color: rgba(255, 255, 255, .75);
  background: transparent;
  cursor: pointer;
  font-size: 20px;
  line-height: 1;
}

.sidebar-nav {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 10px;
  color: rgba(255, 255, 255, .62);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.4;
  transition: var(--ease);
  position: relative;
}

.nav-item:hover {
  background: rgba(255, 255, 255, .06);
  color: #fff;
}

.nav-item.is-active {
  background: rgba(255, 255, 255, .08);
  color: #fff;
  font-weight: 600;
}

.nav-item.is-active::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 18px;
  background: var(--brand);
  border-radius: 0 4px 4px 0;
}

.active-dot {
  width: 5px;
  height: 5px;
  border-radius: 99px;
  background: transparent;
  flex: none;
}

.is-active .active-dot {
  background: var(--brand);
}

.sidebar-info {
  margin-top: auto;
  padding: 26px 10px 4px;
  border-top: 1px solid rgba(255, 255, 255, .08);
  font-size: 12px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .35);
}

.menu-overlay {
  display: block;
  position: fixed;
  inset: 0;
  z-index: 55;
  background: rgba(13, 14, 13, .5);
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease;
}

/* 移动顶栏 */
.mobile-topbar {
  position: sticky;
  top: 0;
  z-index: 45;
  display: none;
  height: 62px;
  align-items: center;
  padding: 0 16px;
  background: rgba(246, 244, 239, .95);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.mobile-menu-btn {
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  background: transparent;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--ink);
  cursor: pointer;
  font-size: 18px;
  transition: var(--ease);
  flex: none;
}

.mobile-menu-btn:hover,
.mobile-menu-btn:focus-visible {
  border-color: var(--brand);
  outline: none;
}

.mobile-topbar-logo {
  display: flex;
  justify-content: center;
  align-items: center;
  min-width: 0;
  flex: 1;
  font-weight: 700;
  color: var(--ink);
  font-size: 15px;
  line-height: 1.3;
}

.mobile-circle {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: var(--brand);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  margin-right: 8px;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  border: 1px solid transparent;
  border-radius: 12px;
  padding: .72rem 1.3rem;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  cursor: pointer;
  transition: var(--ease);
  white-space: nowrap;
}

.btn-primary {
  background: var(--brand);
  color: #fff;
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--brand-dark);
  transform: translateY(-1px);
  outline: none;
  box-shadow: 0 12px 24px rgba(216, 115, 50, .22);
}

.btn-outline {
  border-color: rgba(21, 22, 20, .24);
  color: var(--ink);
  background: transparent;
}

.btn-outline:hover,
.btn-outline:focus-visible {
  border-color: var(--ink);
  background: var(--ink);
  color: #fff;
  outline: none;
  transform: translateY(-1px);
}

.btn-outline-light {
  border-color: rgba(255, 255, 255, .34);
  color: rgba(255, 255, 255, .95);
  background: transparent;
}

.btn-outline-light:hover,
.btn-outline-light:focus-visible {
  border-color: #fff;
  color: #fff;
  background: rgba(255, 255, 255, .08);
  outline: none;
  transform: translateY(-1px);
}

.btn-dark {
  background: var(--coal);
  color: #fff;
}

.btn-dark:hover {
  background: #242722;
  transform: translateY(-1px);
}

.btn-lg {
  padding: .92rem 1.65rem;
  font-size: 16px;
  border-radius: 14px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .14em;
  color: var(--brand);
}

.eyebrow::before {
  content: "";
  width: 20px;
  height: 1px;
  background: currentColor;
  opacity: .55;
}

/* Hero */
.hero-solution {
  position: relative;
  color: #F6F4EF;
  background: linear-gradient(rgba(13, 14, 13, .78), rgba(13, 14, 13, .86)), url('/assets/images/backpic/back-1.webp');
  background-position: center;
  background-size: cover;
  padding: 108px 0 64px;
}

.hero-solution-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 60px;
  align-items: center;
}

.breadcrumb-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: rgba(255, 255, 255, .5);
  margin-bottom: 24px;
}

.breadcrumb-line a {
  transition: color .2s;
}

.breadcrumb-line a:hover {
  color: rgba(255, 255, 255, .92);
}

.hero-title {
  margin: 8px 0 16px;
  font-size: clamp(30px, 4vw, 50px);
  line-height: 1.24;
  letter-spacing: .02em;
  color: #fff;
  font-weight: 800;
}

.hero-sub {
  max-width: 640px;
  font-size: 16px;
  line-height: 1.95;
  color: rgba(255, 255, 255, .72);
}

.hero-cover-card {
  border-radius: 22px;
  overflow: hidden;
  background: rgba(255, 255, 255, .04);
  border: 1px solid rgba(255, 255, 255, .1);
  padding: 8px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, .26);
}

.hero-cover-card img {
  border-radius: 16px;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  width: 100%;
}

.hero-cover-note {
  padding: 12px 6px 8px;
}

.hero-cover-note p {
  font-size: 13px;
  color: rgba(255, 255, 255, .55);
  line-height: 1.75;
  margin: 0;
}

.hero-metrics {
  margin-top: 46px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, .12);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.metric-block strong {
  display: block;
  color: #fff;
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 2px;
}

.metric-block span {
  font-size: 13px;
  color: rgba(255, 255, 255, .5);
}

/* 版块间距 */
.section-spacing {
  padding: 92px 0;
}

.section-spacing-sm {
  padding: 64px 0;
}

.section-chip {
  font-size: 13px;
  font-weight: 600;
  color: var(--brand);
  letter-spacing: .05em;
}

.section-title {
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.3;
  margin-top: 8px;
  font-weight: 800;
  letter-spacing: .01em;
}

.section-desc {
  color: var(--muted);
  font-size: 15px;
  max-width: 620px;
  line-height: 1.95;
}

/* 内容分裂组件 */
.split-lead {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  gap: 56px;
  align-items: center;
}

.text-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.text-list li {
  display: flex;
  gap: 16px;
  padding: 17px 0;
  border-bottom: 1px solid var(--line);
}

.text-list li:first-child {
  padding-top: 0;
}

.text-list-icon {
  width: 34px;
  height: 34px;
  flex: none;
  border-radius: 10px;
  background: var(--brand-soft);
  color: var(--brand);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 700;
}

.text-list-body strong {
  display: block;
  font-size: 15px;
  margin-bottom: 3px;
}

.text-list-body span {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.8;
}

/* 方案库 */
.scheme-row {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr) minmax(0, 1.5fr) auto;
  gap: 24px;
  align-items: center;
  padding: 30px 4px;
  border-bottom: 1px solid var(--line);
  transition: var(--ease);
}

.scheme-row:hover {
  background: rgba(255, 255, 255, .74);
  padding-left: 14px;
  padding-right: 14px;
  border-radius: 16px;
}

.scheme-index {
  font-size: 34px;
  font-weight: 300;
  color: rgba(21, 22, 20, .10);
  letter-spacing: -.02em;
}

.scheme-tag-small {
  display: inline-flex;
  align-items: center;
  width: max-content;
  padding: 4px 10px;
  border-radius: 6px;
  background: var(--brand-soft);
  color: var(--brand-dark);
  font-size: 12px;
  font-weight: 600;
}

.scheme-title {
  margin: 8px 0 4px;
  font-weight: 700;
  font-size: 19px;
  line-height: 1.5;
}

.scheme-desc {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.9;
  max-width: 480px;
}

.scheme-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  transition: var(--ease);
  color: var(--ink);
}

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

/* 流程区 */
.process-wrap {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.process-item {
  position: relative;
  padding: 24px 20px;
  background: var(--surface);
  border-radius: 20px;
  box-shadow: var(--shadow-soft);
  transition: var(--ease);
}

.process-item:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
}

.process-number {
  font-size: 30px;
  font-weight: 800;
  color: var(--brand);
  letter-spacing: -.02em;
  position: relative;
  display: inline-flex;
}

.process-item h3 {
  font-size: 16px;
  margin: 16px 0 8px;
  font-weight: 700;
}

.process-item p {
  margin: 0;
  color: var(--muted);
  font-size: 13.5px;
  line-height: 1.85;
}

/* 图比区块 */
.compare-media {
  position: relative;
  border-radius: 24px;
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.compare-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.compare-text-list {
  margin-top: 18px;
}

.compare-text-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.compare-text-item:first-child {
  padding-top: 0;
}

.compare-text-item strong {
  font-size: 16px;
  display: block;
  margin-bottom: 4px;
}

.compare-text-item p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.85;
}

/* FAQ */
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  border-radius: 16px;
  background: var(--surface);
  box-shadow: 0 6px 20px rgba(21, 22, 20, .03);
  border: 1px solid var(--line);
  overflow: hidden;
  margin-bottom: 12px;
  transition: var(--ease);
}

.faq-item[open] {
  box-shadow: var(--shadow-soft);
  border-color: rgba(216, 115, 50, .24);
}

.faq-summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 22px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  transition: color .2s ease;
}

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

.faq-summary:hover {
  color: var(--brand-dark);
}

.faq-icon {
  width: 28px;
  height: 28px;
  flex: none;
  border-radius: 8px;
  border: 1px solid var(--line);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: 18px;
  transition: var(--ease);
}

.faq-item[open] .faq-icon {
  transform: rotate(45deg);
  border-color: var(--brand);
  color: var(--brand);
}

.faq-body {
  padding: 0 22px 20px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.95;
}

/* 大 CTA */
.final-cta {
  background: linear-gradient(100deg, rgba(19, 20, 18, .96), rgba(19, 20, 18, .94)), url('/assets/images/backpic/back-2.png');
  background-size: cover;
  background-position: center;
  border-radius: 28px;
  color: #fff;
  padding: 52px 46px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 40px;
}

.final-cta h2 {
  margin: 6px 0 10px;
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 800;
}

.final-cta p {
  color: rgba(255, 255, 255, .65);
  font-size: 14px;
  max-width: 560px;
  margin: 0;
}

.contact-line {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: rgba(255, 255, 255, .72);
  font-size: 14px;
  margin-top: 18px;
}

/* 卡片 / 色块背景 */
.bg-surface {
  background: var(--surface);
}

.bg-sand {
  background: var(--bg);
}

.bg-white {
  background: #fff;
}

/* 响应式 */
@media (max-width: 1023px) {
  .content-shell {
    margin-left: 0;
  }

  .sidebar {
    transform: translateX(-100%);
    width: 276px;
  }

  body.menu-open {
    overflow: hidden;
  }

  body.menu-open .sidebar {
    transform: translateX(0);
  }

  body.menu-open .menu-overlay {
    opacity: 1;
    pointer-events: auto;
  }

  .sidebar-close {
    display: inline-flex;
  }

  .mobile-topbar {
    display: flex;
  }

  .hero-solution {
    padding: 88px 0 56px;
  }

  .hero-solution-inner {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .hero-cover-card {
    max-width: 320px;
  }

  .hero-metrics {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .split-lead,
  .scheme-row,
  .final-cta {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .process-wrap {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 767px) {
  .container-page {
    padding-left: 18px;
    padding-right: 18px;
  }

  .section-spacing {
    padding: 60px 0;
  }

  .hero-solution-inner {
    gap: 26px;
  }

  .hero-metrics {
    grid-template-columns: 1fr;
    gap: 8px;
    margin-top: 28px;
  }

  .scheme-row {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 24px 0;
  }

  .scheme-row:hover {
    background: transparent;
    padding-left: 4px;
    padding-right: 4px;
  }

  .scheme-index {
    font-size: 24px;
  }

  .process-wrap {
    grid-template-columns: 1fr;
  }

  .final-cta {
    padding: 32px 24px;
    border-radius: 22px;
  }

  .final-cta-actions {
    width: 100%;
  }

  .final-cta-actions .btn {
    width: 100%;
  }

  .btn-lg {
    width: 100%;
  }
}

/* 焦点统一 */
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
}

.text-muted {
  color: var(--muted);
}

/* roulang page: category3 */
:root {
      --bg-page: #f6f4ef;
      --bg-card: #ffffff;
      --bg-deep: #131412;
      --text-ink: #151614;
      --text-muted: #6b6b66;
      --line-light: rgba(21, 22, 20, 0.08);
      --brand: #d87332;
      --brand-dark: #c3521a;
      --radius-lg: 20px;
      --radius-xl: 28px;
      --shadow-soft: 0 8px 30px rgba(21, 22, 20, 0.05), 0 2px 10px rgba(21, 22, 20, 0.03);
      --shadow-hover: 0 18px 44px rgba(21, 22, 20, 0.12), 0 4px 12px rgba(21, 22, 20, 0.05);
      --ease-out: 200ms ease-out;
      --container-max: 1280px;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      background: var(--bg-page);
      color: var(--text-ink);
      line-height: 1.85;
      font-size: 16px;
      overflow-x: hidden;
    }

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

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

    button,
    input,
    textarea,
    select {
      font: inherit;
    }

    button {
      cursor: pointer;
    }

    .container-page {
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    .app-main {
      min-height: 100vh;
      background: var(--bg-page);
      margin-left: 0;
    }

    .app-sidebar {
      position: fixed;
      top: 0;
      left: 0;
      bottom: 0;
      z-index: 80;
      width: 248px;
      background: var(--bg-deep);
      color: rgba(255, 255, 255, 0.72);
      display: flex;
      flex-direction: column;
      transform: translateX(-103%);
      visibility: hidden;
      transition: transform 260ms ease-out, visibility 260ms ease-out;
      box-shadow: 0 0 30px rgba(0, 0, 0, 0.18);
    }

    .app-sidebar.is-open {
      transform: translateX(0);
      visibility: visible;
    }

    .app-backdrop {
      position: fixed;
      inset: 0;
      z-index: 70;
      background: rgba(19, 20, 18, 0.55);
      opacity: 0;
      visibility: hidden;
      transition: opacity 240ms ease-out, visibility 240ms ease-out;
    }

    .app-backdrop.is-visible {
      opacity: 1;
      visibility: visible;
    }

    .app-topbar {
      position: sticky;
      top: 0;
      z-index: 50;
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 64px;
      padding-left: 18px;
      padding-right: 18px;
      background: rgba(246, 244, 239, 0.94);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--line-light);
    }

    .topbar-burger {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 42px;
      height: 42px;
      border-radius: 12px;
      border: 1px solid rgba(21, 22, 20, 0.1);
      background: #fff;
      color: #151614;
    }

    .topbar-burger svg {
      width: 20px;
      height: 20px;
    }

    .topbar-logo {
      font-weight: 800;
      font-size: 17px;
      letter-spacing: 0.02em;
      color: #1a1916;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .topbar-brand-mark {
      display: inline-flex;
      width: 30px;
      height: 30px;
      border-radius: 9px;
      background: var(--brand);
      color: #fff;
      align-items: center;
      justify-content: center;
      font-size: 14px;
      font-weight: 800;
    }

    .sidebar-brand-mark {
      display: inline-flex;
      width: 42px;
      height: 42px;
      border-radius: 13px;
      background: var(--brand);
      color: #fff;
      align-items: center;
      justify-content: center;
      font-size: 19px;
      font-weight: 800;
      box-shadow: 0 6px 18px rgba(216, 115, 50, 0.22);
    }

    .sidebar-logo-title {
      color: #fff;
      font-size: 17px;
      font-weight: 700;
      letter-spacing: 0.02em;
      line-height: 1.3;
    }

    .sidebar-logo-desc {
      color: rgba(255, 255, 255, 0.42);
      font-size: 12px;
      margin-top: 4px;
    }

    .sidebar-nav {
      display: flex;
      flex-direction: column;
      gap: 6px;
      margin-top: 34px;
    }

    .nav-item {
      position: relative;
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 11px 14px 11px 20px;
      border-radius: 12px;
      color: rgba(255, 255, 255, 0.58);
      font-size: 15px;
      font-weight: 500;
      transition: background var(--ease-out), color var(--ease-out), transform var(--ease-out);
    }

    .nav-item:hover {
      background: rgba(255, 255, 255, 0.06);
      color: #fff;
    }

    .nav-item.is-active {
      background: linear-gradient(90deg, rgba(216, 115, 50, 0.2), rgba(216, 115, 50, 0.04));
      color: #fff;
      font-weight: 600;
    }

    .nav-item .active-dot {
      width: 3px;
      height: 16px;
      border-radius: 999px;
      background: var(--brand);
      opacity: 0;
      transform: scaleY(0.5);
      transition: opacity var(--ease-out), transform var(--ease-out);
    }

    .nav-item.is-active .active-dot {
      opacity: 1;
      transform: scaleY(1);
    }

    .nav-item:focus-visible,
    .topbar-burger:focus-visible,
    .btn:focus-visible,
    .case-card a:focus-visible,
    summary:focus-visible {
      outline: 2px solid var(--brand);
      outline-offset: 3px;
    }

    .sidebar-foot {
      margin-top: auto;
      padding: 20px 22px 18px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      color: rgba(255, 255, 255, 0.4);
      font-size: 12px;
      line-height: 1.8;
    }

    .section-head {
      margin-bottom: 42px;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: var(--brand);
      font-size: 13px;
      font-weight: 600;
      letter-spacing: 0.16em;
      text-transform: uppercase;
    }

    .eyebrow::before {
      content: "";
      width: 22px;
      height: 1px;
      background: var(--brand);
    }

    .section-title {
      margin-top: 10px;
      font-size: 30px;
      line-height: 1.35;
      font-weight: 800;
      letter-spacing: -0.01em;
      color: #191814;
    }

    .section-desc {
      margin-top: 10px;
      max-width: 720px;
      color: var(--text-muted);
      font-size: 15px;
      line-height: 1.9;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border-radius: 999px;
      font-weight: 600;
      font-size: 15px;
      line-height: 1;
      padding: 14px 26px;
      color: #fff;
      background: var(--brand);
      border: 1px solid transparent;
      transition: background var(--ease-out), transform var(--ease-out), box-shadow var(--ease-out), color var(--ease-out), border-color var(--ease-out);
    }

    .btn:hover {
      background: var(--brand-dark);
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(216, 115, 50, 0.26);
    }

    .btn:active {
      transform: translateY(0);
    }

    .btn-outline {
      background: transparent;
      border-color: rgba(255, 255, 255, 0.26);
      color: #fff;
    }

    .btn-outline:hover {
      background: rgba(255, 255, 255, 0.08);
      border-color: rgba(255, 255, 255, 0.5);
      box-shadow: none;
      color: #fff;
    }

    .btn-light {
      background: #fff;
      color: #181713;
    }

    .btn-light:hover {
      background: #f3f0e9;
      box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12);
      color: #181713;
    }

    .btn-text-link {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: #fff;
      font-weight: 600;
      padding: 12px 4px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.28);
      transition: border-color var(--ease-out), color var(--ease-out), opacity var(--ease-out);
    }

    .btn-text-link:hover {
      color: #fff;
      border-color: #fff;
      opacity: 0.9;
    }

    .cat-hero {
      position: relative;
      color: #fff;
      overflow: hidden;
      border-radius: var(--radius-xl);
      background-color: #131412;
    }

    .cat-hero .hero-bg {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.34;
    }

    .cat-hero .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(96deg, rgba(19, 20, 18, 0.96) 0%, rgba(19, 20, 18, 0.66) 55%, rgba(19, 20, 18, 0.34) 100%);
    }

    .breadcrumb {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 8px;
      color: rgba(255, 255, 255, 0.5);
      font-size: 13px;
      margin-bottom: 22px;
    }

    .breadcrumb a {
      color: rgba(255, 255, 255, 0.72);
      transition: color var(--ease-out);
    }

    .breadcrumb a:hover {
      color: #fff;
    }

    .breadcrumb span {
      margin: 0 2px;
    }

    .hero-h1 {
      margin: 16px 0 0;
      font-size: clamp(32px, 5.2vw, 64px);
      font-weight: 800;
      line-height: 1.18;
      letter-spacing: -0.02em;
      max-width: 800px;
    }

    .hero-sub {
      margin-top: 20px;
      max-width: 680px;
      color: rgba(255, 255, 255, 0.72);
      font-size: 16px;
      line-height: 1.95;
    }

    .hero-cta-row {
      margin-top: 32px;
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }

    .case-demo-label {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 14px;
      color: #fff;
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.1);
      padding: 12px 16px;
      border-radius: 16px;
    }

    .case-demo-label .badge-dot {
      display: inline-flex;
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: var(--brand);
    }

    .masonry-grid {
      column-gap: 22px;
      column-count: 1;
    }

    .masonry-grid > * {
      break-inside: avoid;
      margin-bottom: 22px;
    }

    .text-card {
      background: #fff;
      border: 1px solid rgba(21, 22, 20, 0.05);
      border-radius: 22px;
      overflow: hidden;
      box-shadow: var(--shadow-soft);
      transition: transform var(--ease-out), box-shadow var(--ease-out);
    }

    .text-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-hover);
    }

    .case-media {
      position: relative;
      overflow: hidden;
      aspect-ratio: 4 / 3;
      background: #ece8df;
    }

    .case-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 320ms ease-out;
    }

    .text-card:hover .case-media img {
      transform: scale(1.05);
    }

    .case-code-strip {
      position: absolute;
      left: 14px;
      right: 14px;
      bottom: 12px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      color: #fff;
      font-size: 11px;
      letter-spacing: 0.04em;
      padding: 7px 10px;
      border-radius: 9px;
      background: rgba(19, 20, 18, 0.62);
      backdrop-filter: blur(8px);
      line-height: 1;
    }

    .case-tag {
      display: inline-flex;
      align-items: center;
      margin: 18px 18px 0;
      color: var(--brand);
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 0.08em;
    }

    .case-title {
      margin: 8px 18px 0;
      font-size: 17px;
      font-weight: 700;
      line-height: 1.55;
      color: #1a1916;
    }

    .case-summary {
      margin: 10px 18px 0;
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.85;
    }

    .case-meta {
      display: flex;
      align-items: center;
      gap: 8px;
      padding: 16px 18px 18px;
      margin-top: 16px;
      border-top: 1px solid rgba(21, 22, 20, 0.06);
      color: #8b8880;
      font-size: 12px;
    }

    .case-meta .avatar-mini {
      width: 24px;
      height: 24px;
      border-radius: 50%;
      background: #eaded0;
      color: #8a4f26;
      font-size: 11px;
      font-weight: 700;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .quote-section {
      background: #131412;
      color: #fff;
    }

    .quote-card {
      height: 100%;
      background: rgba(255, 255, 255, 0.045);
      border: 1px solid rgba(255, 255, 255, 0.07);
      border-radius: 24px;
      padding: 26px 24px 22px;
      display: flex;
      flex-direction: column;
      transition: background var(--ease-out), transform var(--ease-out), border-color var(--ease-out);
    }

    .quote-card:hover {
      background: rgba(255, 255, 255, 0.07);
      transform: translateY(-3px);
      border-color: rgba(216, 115, 50, 0.35);
    }

    .quote-stars {
      color: var(--brand);
      letter-spacing: 2px;
      font-size: 14px;
    }

    .quote-text {
      margin-top: 18px;
      color: rgba(255, 255, 255, 0.84);
      font-size: 15px;
      line-height: 1.9;
    }

    .quote-author {
      margin-top: auto;
      padding-top: 20px;
      color: rgba(255, 255, 255, 0.46);
      font-size: 13px;
      line-height: 1.7;
    }

    .quote-note {
      margin-top: 22px;
      color: rgba(255, 255, 255, 0.34);
      font-size: 12px;
      line-height: 1.8;
    }

    .step-card {
      position: relative;
      min-height: 220px;
      background: #fff;
      border-radius: 22px;
      padding: 24px;
      border: 1px solid rgba(21, 22, 20, 0.05);
      box-shadow: var(--shadow-soft);
      transition: transform var(--ease-out), box-shadow var(--ease-out);
    }

    .step-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .step-num {
      font-size: 32px;
      font-weight: 800;
      color: rgba(216, 115, 50, 0.18);
      line-height: 1;
      letter-spacing: -0.03em;
    }

    .step-title {
      margin-top: 28px;
      font-size: 17px;
      font-weight: 700;
      color: #1b1a18;
    }

    .step-desc {
      margin-top: 12px;
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.85;
    }

    .faq-item {
      background: #fff;
      border: 1px solid rgba(21, 22, 20, 0.06);
      border-radius: 18px;
      padding: 20px 22px;
      transition: border-color var(--ease-out), box-shadow var(--ease-out);
    }

    .faq-item:hover {
      border-color: rgba(216, 115, 50, 0.24);
      box-shadow: var(--shadow-soft);
    }

    .faq-item summary {
      cursor: pointer;
      list-style: none;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      font-weight: 600;
      color: #1b1a18;
      outline: none;
    }

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

    .faq-icon {
      flex: 0 0 24px;
      width: 24px;
      height: 24px;
      border-radius: 50%;
      background: #f1ecdf;
      color: #9a4f26;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      font-size: 17px;
      transition: transform var(--ease-out), background var(--ease-out), color var(--ease-out);
    }

    .faq-item[open] .faq-icon {
      transform: rotate(45deg);
      background: var(--brand);
      color: #fff;
    }

    .faq-body {
      margin-top: 14px;
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.9;
      padding-right: 18px;
    }

    .cta-panel {
      background: #131412;
      color: #fff;
      border-radius: 32px;
      padding: 56px 32px;
      overflow: hidden;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 36px;
    }

    .cta-panel::before {
      content: "";
      position: absolute;
      width: 320px;
      height: 320px;
      right: -80px;
      top: -80px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(216, 115, 50, 0.16), rgba(216, 115, 50, 0) 68%);
    }

    .cta-panel h2 {
      font-size: clamp(26px, 4vw, 40px);
      line-height: 1.3;
      font-weight: 800;
      letter-spacing: -0.02em;
      max-width: 600px;
    }

    .cta-panel p {
      margin-top: 14px;
      color: rgba(255, 255, 255, 0.62);
      max-width: 500px;
      font-size: 15px;
      line-height: 1.95;
    }

    .cta-buttons {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 26px;
    }

    .cta-contact-mini {
      margin-top: 30px;
      font-size: 13px;
      color: rgba(255, 255, 255, 0.42);
      line-height: 1.8;
    }

    .cta-contact-mini span {
      color: rgba(255, 255, 255, 0.7);
    }

    @media (min-width: 640px) {
      .container-page {
        padding-left: 28px;
        padding-right: 28px;
      }

      .masonry-grid {
        column-count: 2;
      }

      .section-title {
        font-size: 36px;
      }
    }

    @media (min-width: 1024px) {
      .app-topbar {
        display: none;
      }

      .app-main {
        margin-left: 248px;
      }

      .app-sidebar {
        transform: none;
        visibility: visible;
      }
    }

    @media (min-width: 1200px) {
      .masonry-grid {
        column-count: 3;
        column-gap: 26px;
      }

      .masonry-grid > * {
        margin-bottom: 26px;
      }
    }

    @media (max-width: 1023px) {
      .cta-panel {
        flex-direction: column;
        align-items: flex-start;
        padding: 44px 24px;
      }
    }

    @media (max-width: 600px) {
      .hero-h1 {
        font-size: 34px;
      }

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

      .hero-cta-row .btn {
        width: 100%;
      }

      .section-head {
        margin-bottom: 28px;
      }

      .section-title {
        font-size: 27px;
      }

      .cat-hero {
        border-radius: 22px;
      }

      .cta-buttons {
        flex-direction: column;
        align-items: stretch;
      }

      .cta-buttons .btn {
        width: 100%;
      }

      .case-demo-label {
        align-items: flex-start;
        flex-wrap: wrap;
      }
    }

/* roulang page: category4 */
:root {
            --bg: #f6f4ef;
            --card-bg: #ffffff;
            --text: #151614;
            --muted: #777670;
            --line: rgba(21, 22, 20, .1);
            --brand: #d87332;
            --brand-deep: #c3521a;
            --dark: #131412;
            --radius: 20px;
            --radius-lg: 28px;
            --shadow: 0 1px 2px rgba(21,22,20,.04), 0 12px 32px rgba(21,22,20,.06);
            --shadow-lift: 0 2px 4px rgba(21,22,20,.05), 0 18px 42px rgba(21,22,20,.12);
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", system-ui, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.85;
            -webkit-font-smoothing: antialiased;
        }

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

        a,
        button,
        input,
        textarea {
            outline: none;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 2px solid rgba(216, 115, 50, .7);
            outline-offset: 3px;
        }

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

        .container-page {
            width: 100%;
            margin-left: auto;
            margin-right: auto;
            max-width: 1220px;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }

        @media (min-width: 640px) {
            .container-page {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }

        @media (min-width: 1280px) {
            .container-page {
                padding-left: 3.5rem;
                padding-right: 3.5rem;
            }
        }

        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: .5rem;
            font-size: .75rem;
            letter-spacing: .22em;
            text-transform: uppercase;
            font-weight: 600;
            color: #d87332;
        }

        .sidebar-nav {
            display: flex;
            flex-direction: column;
            gap: .3rem;
        }

        .sidebar-nav .nav-item {
            position: relative;
            display: flex;
            align-items: center;
            gap: .85rem;
            padding: .7rem 1rem;
            border-radius: 12px;
            color: rgba(255, 255, 255, .68);
            font-size: .92rem;
            font-weight: 500;
            transition: all .2s ease-out;
        }

        .sidebar-nav .nav-item:hover {
            color: #fff;
            background: rgba(255, 255, 255, .06);
        }

        .sidebar-nav .nav-item.is-active {
            color: #f5bb8e;
            background: rgba(216, 115, 50, .12);
        }

        .sidebar-nav .active-dot {
            width: 4px;
            height: 20px;
            border-radius: 999px;
            background: transparent;
            transition: background .2s ease;
        }

        .sidebar-nav .nav-item.is-active .active-dot {
            background: #d87332;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: .5rem;
            background: #d87332;
            color: #fff;
            font-weight: 600;
            border-radius: 12px;
            padding: .8rem 1.5rem;
            font-size: .95rem;
            transition: all .23s ease-out;
            border: 1px solid transparent;
            min-height: 46px;
            box-shadow: 0 8px 22px rgba(216, 115, 50, .22);
        }

        .btn-primary:hover {
            background: #c3521a;
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(195, 82, 26, .26);
        }

        .btn-primary:active {
            transform: translateY(0);
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: .5rem;
            border: 1px solid rgba(21, 22, 20, .22);
            color: #151614;
            font-weight: 500;
            border-radius: 12px;
            min-height: 46px;
            padding: .8rem 1.5rem;
            font-size: .95rem;
            background: rgba(255, 255, 255, .15);
            transition: all .22s ease-out;
        }

        .btn-outline:hover {
            border-color: #d87332;
            color: #c3521a;
            background: rgba(216, 115, 50, .05);
            transform: translateY(-2px);
        }

        .hero-cta .btn-outline {
            border-color: rgba(255, 255, 255, .5);
            color: #fff;
            background: rgba(255, 255, 255, .08);
        }

        .hero-cta .btn-outline:hover {
            border-color: #d87332;
            background: #d87332;
            color: #fff;
        }

        .material-card {
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            overflow: hidden;
            border: 1px solid rgba(21, 22, 20, .04);
            transition: transform .23s ease-out, box-shadow .23s ease-out;
        }

        .material-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lift);
        }

        .material-card .cover-wrap {
            overflow: hidden;
            position: relative;
        }

        .material-card .cover-wrap img {
            transition: transform .6s cubic-bezier(.22, 1, .36, 1);
            object-fit: cover;
            width: 100%;
            height: 100%;
        }

        .material-card:hover .cover-wrap img {
            transform: scale(1.045);
        }

        .tag {
            display: inline-flex;
            align-items: center;
            gap: .35rem;
            padding: .28rem .7rem;
            background: rgba(216, 115, 50, .1);
            color: #b34a18;
            border-radius: 999px;
            font-size: .75rem;
            font-weight: 600;
            letter-spacing: .02em;
        }

        .info-line {
            font-size: .8rem;
            color: var(--muted);
        }

        .footer-link {
            transition: color .2s ease;
        }

        .footer-link:hover {
            color: #fff;
        }

        .faq-item {
            border: 1px solid transparent;
            border-radius: 18px;
            background: rgba(255, 255, 255, .7);
            transition: background .2s ease, border-color .2s ease;
        }

        .faq-item:hover {
            border-color: rgba(216, 115, 50, .25);
            background: #fff;
        }

        .faq-icon {
            color: #d87332;
            width: 24px;
            height: 24px;
            flex-shrink: 0;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 999px;
            background: rgba(216, 115, 50, .1);
        }

        .section-space {
            padding-top: 4.5rem;
            padding-bottom: 4.5rem;
        }

        @media (min-width: 1024px) {
            .section-space {
                padding-top: 5.5rem;
                padding-bottom: 5.5rem;
            }
        }

        .topic-link {
            transition: all .22s ease-out;
        }

        .topic-link:hover {
            color: #c3521a;
            transform: translateX(4px);
        }

        .has-blue-link a {
            color: #d87332;
        }