/* roulang page: index */
:root {
  --color-primary: #FF4D00;
  --color-primary-light: #FF9E00;
  --color-accent: #00E5FF;
  --color-bg: #0F0D10;
  --color-surface: #181520;
  --color-text: #F5F3F0;
  --color-dim: #B9B3B0;
  --radius-lg: 24px;
  --radius-md: 12px;
  --shadow-card: 0 20px 60px rgba(0, 0, 0, .35), inset 0 1px 0 rgba(255, 255, 255, .06);
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: 16px;
  margin: 0;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font-family: inherit; }
.container { max-width: 80rem; margin: 0 auto; padding: 0 1rem; }
@media (min-width: 768px) { .container { padding: 0 1.5rem; } }
@media (min-width: 1024px) { .container { padding: 0 2rem; } }
.brand-gradient { background: linear-gradient(135deg, #FF4D00, #FF9E00); }
.brand-gradient-text {
  background: linear-gradient(135deg, #FF4D00, #FF9E00);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}
.hero-overlay {
  background: linear-gradient(180deg, rgba(15,13,16,.35) 0%, rgba(15,13,16,.92) 78%);
}
.card {
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
}
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(255,255,255,.12);
  box-shadow: 0 24px 64px rgba(0,0,0,.4), 0 0 40px rgba(255,77,0,.15), inset 0 1px 0 rgba(255,255,255,.08);
}
.btn-primary {
  background: linear-gradient(135deg, #FF4D00, #FF9E00);
  border-radius: 9999px;
  padding: .85rem 2rem;
  font-weight: 700;
  color: #fff;
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  transition: transform .2s ease, filter .2s ease, box-shadow .2s ease;
  box-shadow: 0 4px 20px rgba(255,77,0,.35);
  cursor: pointer;
  border: 0;
}
.btn-primary:hover { filter: brightness(1.1); transform: translateY(-2px); }
.btn-primary:active { transform: scale(.98); }
.btn-primary:focus-visible { outline: none; box-shadow: 0 0 0 4px rgba(255,77,0,.3); }
.btn-secondary {
  border-radius: 9999px;
  padding: .85rem 2rem;
  font-weight: 700;
  color: var(--color-text);
  border: 1px solid rgba(255,255,255,.2);
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  transition: transform .2s ease, border-color .2s ease, background .2s ease;
  cursor: pointer;
  background: rgba(255,255,255,.05);
}
.btn-secondary:hover { border-color: rgba(255,255,255,.4); background: rgba(255,255,255,.1); }
.btn-secondary:active { transform: scale(.98); }
.btn-secondary:focus-visible { outline: none; box-shadow: 0 0 0 4px rgba(255,255,255,.15); }
.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 9999px;
  font-size: .75rem;
  font-weight: 600;
  padding: .25rem .75rem;
  background: rgba(255,77,0,.15);
  border: 1px solid rgba(255,77,0,.3);
  color: #FF9E00;
}
.nav-link {
  position: relative;
  font-size: .875rem;
  font-weight: 500;
  color: var(--color-dim);
  padding: .5rem .75rem;
  border-radius: 9999px;
  transition: color .2s ease, background .2s ease;
  white-space: nowrap;
}
.nav-link:hover { color: var(--color-text); background: rgba(255,255,255,.06); }
.nav-link.active { color: #fff; background: rgba(255,77,0,.15); }
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, #FF4D00, #FF9E00);
}
.no-scrollbar::-webkit-scrollbar { display: none; }
.no-scrollbar { -ms-overflow-style: none; scrollbar-width: none; }
.stat-number {
  font-size: 2.5rem;
  line-height: 1.1;
  font-weight: 800;
  background: linear-gradient(135deg, #FF4D00, #FF9E00);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-variant-numeric: tabular-nums;
}
@media (min-width: 768px) { .stat-number { font-size: 3rem; } }
.faq-item {
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius-md);
  background: rgba(255,255,255,.03);
  transition: border-color .3s ease, background .3s ease;
  margin-bottom: .75rem;
  overflow: hidden;
}
.faq-item[open] {
  border-color: rgba(255,77,0,.4);
  background: rgba(255,255,255,.05);
}
.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 1.25rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: 1rem;
  transition: color .2s ease;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { color: #FF9E00; }
.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255,255,255,.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  line-height: 1;
  color: var(--color-dim);
  transition: transform .3s ease, background .3s ease, color .3s ease;
  flex-shrink: 0;
}
.faq-item[open] .faq-icon {
  transform: rotate(45deg);
  background: linear-gradient(135deg, #FF4D00, #FF9E00);
  color: #fff;
}
.faq-answer { padding: 0 1.5rem 1.25rem; line-height: 1.8; color: var(--color-dim); font-size: .9375rem; }
.form-input {
  width: 100%;
  background: rgba(0,0,0,.35);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius-md);
  padding: .75rem 1rem;
  color: var(--color-text);
  font-size: .875rem;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(255,77,0,.15);
}
.form-input::placeholder { color: rgba(185,179,176,.6); }
.form-label {
  display: block;
  font-size: .8125rem;
  color: var(--color-dim);
  margin-bottom: .4rem;
}
.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.line-clamp-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
footer a { color: var(--color-dim); transition: color .2s ease; }
footer a:hover { color: #FF9E00; }
::selection { background: rgba(255,77,0,.3); color: #fff; }
.hero-pattern {
  background-image:
    linear-gradient(45deg, rgba(255,255,255,.02) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(255,255,255,.02) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(255,255,255,.02) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(255,255,255,.02) 75%);
  background-size: 30px 30px;
}
.float-cta-desktop {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 40;
}
@media (max-width: 767px) {
  .float-cta-desktop { display: none; }
}
.float-cta-mobile {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  padding: 0 .75rem;
  background: rgba(15,13,16,.95);
  border-top: 1px solid rgba(255,255,255,.1);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
@media (min-width: 768px) {
  .float-cta-mobile { display: none; }
}
@media (max-width: 767px) {
  body { padding-bottom: 60px; }
}
@media (min-width: 768px) {
  body { padding-bottom: 0; }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-fade-up { animation: fadeInUp .6s ease both; }
.delay-100 { animation-delay: .1s; }
.delay-200 { animation-delay: .2s; }
.delay-300 { animation-delay: .3s; }

/* roulang page: category1 */
:root {
      --c-primary: #FF4D00;
      --c-primary-light: #FF9E00;
      --c-electric: #00E5FF;
      --c-bg-dark: #0F0D10;
      --c-surface: #181520;
      --c-text-light: #F5F3F0;
      --c-text-dim: #B9B3B0;
      --c-border: rgba(255, 255, 255, .08);
      --grad-main: linear-gradient(135deg, #FF4D00, #FF9E00);
      --grad-alt: linear-gradient(135deg, #FF4D00, #FF3D77);
      --shadow-card: 0 20px 60px rgba(0, 0, 0, .35);
      --radius-card: 24px;
      --radius-sm: 12px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      background: var(--c-bg-dark);
      color: var(--c-text-light);
      font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button,
    input {
      font: inherit;
    }

    .container {
      max-width: 80rem;
      margin-inline: auto;
      padding-inline: 1rem;
    }

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

    @media (min-width: 1024px) {
      .container {
        padding-inline: 2rem;
      }
    }

    .brand-gradient {
      background: var(--grad-main);
    }

    .brand-gradient-alt {
      background: var(--grad-alt);
    }

    .bg-deep {
      background: var(--c-bg-dark);
    }

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

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

    .nav-link {
      display: inline-flex;
      align-items: center;
      padding: .35rem .9rem;
      border-radius: 999px;
      font-size: .875rem;
      font-weight: 500;
      color: var(--c-text-dim);
      white-space: nowrap;
      transition: color .2s, background .2s;
      flex-shrink: 0;
    }

    .nav-link:hover {
      color: var(--c-text-light);
      background: rgba(255, 255, 255, .06);
    }

    .nav-link.active {
      color: #fff;
      background: var(--grad-main);
      box-shadow: 0 4px 18px rgba(255, 77, 0, .35);
    }

    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: var(--grad-main);
      color: #fff;
      font-weight: 700;
      font-size: .9375rem;
      border-radius: 999px;
      padding: .8rem 1.6rem;
      box-shadow: 0 8px 28px rgba(255, 77, 0, .35);
      transition: filter .2s, transform .2s, box-shadow .2s;
      border: none;
      cursor: pointer;
      white-space: nowrap;
    }

    .btn-primary:hover {
      filter: brightness(1.15);
      transform: translateY(-2px);
      box-shadow: 0 12px 32px rgba(255, 77, 0, .45);
    }

    .btn-primary:active {
      transform: scale(.98);
    }

    .btn-primary:focus-visible {
      outline: 3px solid var(--c-electric);
      outline-offset: 2px;
    }

    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: 1px solid rgba(255, 255, 255, .18);
      border-radius: 999px;
      padding: .8rem 1.6rem;
      font-weight: 600;
      font-size: .9375rem;
      color: var(--c-text-light);
      background: rgba(255, 255, 255, .03);
      transition: border-color .2s, background .2s, transform .2s;
      cursor: pointer;
      white-space: nowrap;
    }

    .btn-secondary:hover {
      border-color: var(--c-primary);
      background: rgba(255, 77, 0, .08);
      transform: translateY(-2px);
    }

    .btn-secondary:active {
      transform: scale(.98);
    }

    .btn-secondary:focus-visible {
      outline: 3px solid var(--c-electric);
      outline-offset: 2px;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      padding: .25rem .8rem;
      border-radius: 999px;
      font-size: .75rem;
      font-weight: 700;
      background: rgba(255, 77, 0, .12);
      color: #FF8A5C;
      border: 1px solid rgba(255, 77, 0, .25);
    }

    .badge-alt {
      background: var(--grad-alt);
      color: #fff;
      border: none;
      box-shadow: 0 4px 16px rgba(255, 61, 119, .3);
    }

    .badge-electric {
      background: rgba(0, 229, 255, .1);
      color: var(--c-electric);
      border: 1px solid rgba(0, 229, 255, .25);
    }

    .section-tag {
      display: inline-flex;
      align-items: center;
      gap: .5rem;
      font-size: .75rem;
      font-weight: 700;
      letter-spacing: .1em;
      text-transform: uppercase;
      color: var(--c-primary);
    }

    .section-tag::before {
      content: '';
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--grad-main);
      display: inline-block;
    }

    .stat-card {
      background: rgba(255, 255, 255, .05);
      border: 1px solid rgba(255, 255, 255, .1);
      border-radius: 16px;
      padding: 1.6rem 1.2rem;
      text-align: center;
      box-shadow: var(--shadow-card);
      transition: border-color .3s, transform .3s;
    }

    .stat-card:hover {
      border-color: rgba(255, 77, 0, .4);
      transform: translateY(-4px);
    }

    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.1;
      background: var(--grad-main);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      font-variant-numeric: tabular-nums;
    }

    .stat-label {
      margin-top: .5rem;
      font-size: .75rem;
      color: var(--c-text-dim);
      font-weight: 500;
    }

    .featured-card {
      background: rgba(255, 255, 255, .04);
      border: 1px solid var(--c-border);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: transform .3s, border-color .3s, box-shadow .3s;
    }

    .featured-card:hover {
      transform: translateY(-4px);
      border-color: rgba(255, 255, 255, .12);
      box-shadow: 0 24px 64px rgba(0, 0, 0, .45), 0 0 40px rgba(255, 77, 0, .15);
    }

    .small-card {
      background: rgba(255, 255, 255, .04);
      border: 1px solid var(--c-border);
      border-radius: 20px;
      padding: 1.2rem;
      transition: transform .3s, border-color .3s, box-shadow .3s;
      box-shadow: var(--shadow-card);
    }

    .small-card:hover {
      transform: translateY(-4px);
      border-color: rgba(255, 77, 0, .35);
      box-shadow: 0 16px 40px rgba(0, 0, 0, .35), 0 0 30px rgba(255, 77, 0, .12);
    }

    .content-card {
      background: rgba(255, 255, 255, .04);
      border: 1px solid var(--c-border);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: transform .3s, border-color .3s, box-shadow .3s;
    }

    .content-card:hover {
      transform: translateY(-4px);
      border-color: rgba(255, 255, 255, .12);
      box-shadow: 0 24px 64px rgba(0, 0, 0, .45), 0 0 40px rgba(255, 77, 0, .15);
    }

    .content-card img {
      transition: transform .4s ease;
    }

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

    .step-card {
      background: rgba(255, 255, 255, .04);
      border: 1px solid var(--c-border);
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      position: relative;
      transition: transform .3s, border-color .3s;
    }

    .step-card:hover {
      transform: translateY(-4px);
      border-color: rgba(255, 77, 0, .35);
    }

    .step-num {
      font-size: 3rem;
      font-weight: 800;
      background: var(--grad-main);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      line-height: 1;
      margin-bottom: 1.5rem;
      font-variant-numeric: tabular-nums;
    }

    .faq-item {
      border-radius: 16px;
      background: rgba(255, 255, 255, .04);
      border: 1px solid rgba(255, 255, 255, .1);
      transition: border-color .3s, background .3s;
      overflow: hidden;
    }

    .faq-item[open] {
      border-color: var(--c-primary);
      background: rgba(255, 255, 255, .06);
    }

    .faq-question {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 1rem;
      padding: 1.25rem 1.5rem;
      cursor: pointer;
      font-weight: 600;
      list-style: none;
      transition: color .2s;
    }

    .faq-question:hover {
      color: var(--c-text-light);
    }

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

    .faq-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 28px;
      height: 28px;
      border-radius: 50%;
      background: rgba(255, 77, 0, .15);
      color: var(--c-primary);
      font-size: 1.25rem;
      font-weight: 400;
      transition: transform .3s;
      flex-shrink: 0;
    }

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

    .faq-answer {
      padding: 0 1.5rem 1.25rem;
      line-height: 1.8;
      color: var(--c-text-dim);
      font-size: .9375rem;
    }

    .floating-cta {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      z-index: 40;
      display: flex;
      align-items: center;
      gap: .75rem;
      padding: .8rem 1rem;
      background: rgba(15, 13, 16, .95);
      backdrop-filter: blur(12px);
      border-top: 1px solid rgba(255, 255, 255, .1);
    }

    @media (min-width: 768px) {
      .floating-cta {
        bottom: 1.5rem;
        left: auto;
        right: 1.5rem;
        flex-direction: column;
        padding: 0;
        background: transparent;
        border-top: none;
        backdrop-filter: none;
      }
    }

    .floating-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: .5rem;
      background: var(--grad-main);
      color: #fff;
      font-weight: 700;
      font-size: .875rem;
      border-radius: 999px;
      padding: .8rem 1.4rem;
      box-shadow: 0 8px 30px rgba(255, 77, 0, .45);
      transition: all .3s;
      white-space: nowrap;
      flex: 1;
    }

    .floating-btn .floating-text {
      max-width: 8rem;
      overflow: hidden;
      white-space: nowrap;
      transition: max-width .3s, margin .3s;
    }

    @media (min-width: 768px) {
      .floating-btn {
        padding: .95rem;
        flex: none;
      }
      .floating-btn .floating-text {
        max-width: 0;
      }
      .floating-btn:hover {
        padding-inline: 1.4rem;
      }
      .floating-btn:hover .floating-text {
        max-width: 8rem;
        margin-left: .25rem;
      }
    }

    .floating-btn:active {
      transform: scale(.96);
    }

    .floating-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: 1px solid rgba(255, 255, 255, .2);
      border-radius: 999px;
      padding: .8rem 1.2rem;
      font-weight: 600;
      font-size: .875rem;
      color: var(--c-text-light);
      background: rgba(255, 255, 255, .05);
      flex: 1;
      white-space: nowrap;
      transition: border-color .2s, background .2s;
    }

    .floating-secondary:hover {
      border-color: var(--c-primary);
    }

    @media (min-width: 768px) {
      .floating-secondary {
        display: none;
      }
    }

    .dot-grid {
      background-image: radial-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px);
      background-size: 24px 24px;
    }

    .line-clamp-2 {
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      overflow: hidden;
    }

    .line-clamp-3 {
      display: -webkit-box;
      -webkit-line-clamp: 3;
      -webkit-box-orient: vertical;
      overflow: hidden;
    }

    footer a {
      transition: color .2s;
    }

    footer a:hover {
      color: var(--c-text-light);
    }

/* roulang page: article */
:root {
  --primary: #FF4D00;
  --primary-light: #FF9E00;
  --accent: #00E5FF;
  --bg-dark: #0F0D10;
  --bg-surface: #181520;
  --text-light: #F5F3F0;
  --text-dim: #B9B3B0;
  --border: rgba(255,255,255,.08);
  --brand-gradient: linear-gradient(135deg, #FF4D00, #FF9E00);
  --brand-gradient-alt: linear-gradient(135deg, #FF4D00, #FF3D77);
  --shadow-card: 0 20px 60px rgba(0,0,0,.35);
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg-dark);
  color: var(--text-light);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

.container { max-width: 80rem; margin: 0 auto; padding: 0 1rem; }
@media (min-width: 768px) { .container { padding: 0 1.5rem; } }
@media (min-width: 1024px) { .container { padding: 0 2rem; } }

.brand-gradient { background: linear-gradient(135deg, #FF4D00, #FF9E00); }
.brand-gradient-alt { background: linear-gradient(135deg, #FF4D00, #FF3D77); }

.btn-primary {
  background: linear-gradient(135deg, #FF4D00, #FF9E00);
  color: #fff;
  border-radius: 999px;
  padding: .75rem 1.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: .875rem;
  border: none;
  cursor: pointer;
  transition: all .3s ease;
  box-shadow: 0 8px 30px rgba(255,77,0,.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(255,77,0,.4); filter: brightness(1.1); }
.btn-primary:active { transform: scale(.98); }
.btn-primary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.btn-secondary {
  border: 1px solid rgba(255,255,255,.15);
  color: var(--text-light);
  border-radius: 999px;
  padding: .75rem 1.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
  font-size: .875rem;
  transition: all .3s ease;
}
.btn-secondary:hover { border-color: var(--primary); color: var(--primary-light); }
.btn-secondary:active { transform: scale(.98); }
.btn-secondary:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

.btn-white {
  background: #fff;
  color: var(--primary);
  border-radius: 999px;
  padding: .625rem 1.25rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: .875rem;
  transition: all .3s ease;
}
.btn-white:hover { background: rgba(255,255,255,.9); transform: translateY(-2px); }
.btn-white:active { transform: scale(.98); }

.nav-link {
  color: var(--text-dim);
  padding: .45rem .75rem;
  font-size: .875rem;
  font-weight: 500;
  white-space: nowrap;
  border-radius: 8px;
  transition: all .3s ease;
  display: inline-flex;
  align-items: center;
}
.nav-link:hover { color: var(--text-light); background: rgba(255,255,255,.04); }
.nav-link.active {
  color: #fff;
  background: linear-gradient(135deg, rgba(255,77,0,.22), rgba(255,158,0,.08));
  box-shadow: inset 0 0 0 1px rgba(255,77,0,.3);
}

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

.card {
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 24px;
  box-shadow: var(--shadow-card), inset 0 1px 0 rgba(255,255,255,.06);
  transition: all .3s ease;
}
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(255,255,255,.12);
  box-shadow: 0 0 40px rgba(255,77,0,.15), inset 0 1px 0 rgba(255,255,255,.06);
}

.form-input {
  width: 100%;
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 12px;
  padding: .625rem 1rem;
  color: var(--text-light);
  font-size: .875rem;
  transition: all .3s ease;
}
.form-input::placeholder { color: rgba(185,179,176,.6); }
.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(255,77,0,.15);
}

.article-body p {
  margin-bottom: 1.25rem;
  line-height: 1.8;
  font-size: 17px;
  color: rgba(245,243,240,.9);
}
.article-body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 2rem 0 1rem;
  color: var(--text-light);
}
.article-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 1.5rem 0 .75rem;
  color: var(--text-light);
}
.article-body blockquote {
  border-left: 4px solid var(--primary);
  padding: .5rem 0 .5rem 1.25rem;
  color: var(--text-dim);
  background: rgba(255,77,0,.03);
  border-radius: 0 12px 12px 0;
  margin: 1.5rem 0;
}
.article-body img { border-radius: 16px; margin: 1.5rem 0; }
.article-body table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-size: .875rem; }
.article-body th, .article-body td { border: 1px solid rgba(255,255,255,.1); padding: .75rem 1rem; text-align: left; }
.article-body th { background: rgba(255,255,255,.05); font-weight: 600; }
.article-body a { color: var(--primary-light); text-decoration: underline; text-underline-offset: 2px; }
.article-body ul, .article-body ol { margin: 1.25rem 0; padding-left: 1.5rem; }
.article-body li { margin-bottom: .5rem; line-height: 1.7; }
.article-body pre {
  background: var(--bg-surface);
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 12px;
  padding: 1rem;
  overflow-x: auto;
  font-size: .875rem;
  margin: 1.5rem 0;
}
.article-body code { font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; font-size: .875em; }
.article-body hr { border: none; border-top: 1px solid rgba(255,255,255,.08); margin: 2rem 0; }

.line-clamp-1 { display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden; }
.line-clamp-2 { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.line-clamp-3 { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

.faq-item { background: rgba(255,255,255,.03); border: 1px solid rgba(255,255,255,.08); border-radius: 16px; transition: border-color .3s ease, background .3s ease; }
.faq-item.open { border-color: rgba(255,77,0,.4); background: rgba(255,255,255,.05); }
.faq-icon { transition: transform .3s ease; }
.faq-item.open .faq-icon { transform: rotate(45deg); }

footer ul li a { color: var(--text-dim); transition: color .3s ease; }
footer ul li a:hover { color: var(--primary-light); }

/* roulang page: category2 */
:root {
    --primary: #FF4D00;
    --primary-light: #FF9E00;
    --accent: #00E5FF;
    --bg-dark: #0F0D10;
    --surface: #181520;
    --text-light: #F5F3F0;
    --text-dim: #B9B3B0;
    --border-light: rgba(255, 255, 255, .08);
    --radius-lg: 24px;
    --radius-md: 16px;
    --radius-sm: 12px;
    --shadow-card: 0 20px 60px rgba(0, 0, 0, .35);
    --shadow-glow: 0 0 40px rgba(255, 77, 0, .15);
  }

  * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  html {
    scroll-behavior: smooth;
  }

  body {
    font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg-dark);
    color: var(--text-light);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    font-feature-settings: "tnum";
  }

  a {
    color: inherit;
    text-decoration: none;
    transition: color .25s;
  }

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

  button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
  }

  .container {
    width: 100%;
    max-width: 80rem;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1rem;
    padding-right: 1rem;
  }

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

  @media (min-width: 1024px) {
    .container {
      padding-left: 2rem;
      padding-right: 2rem;
    }
  }

  .brand-gradient {
    background: linear-gradient(135deg, #FF4D00, #FF9E00);
  }

  .brand-gradient-deep {
    background: linear-gradient(135deg, #FF4D00, #FF3D77);
  }

  .brand-text {
    background: linear-gradient(135deg, #FF4D00, #FF9E00);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }

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

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

  .btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .5rem;
    padding: .75rem 1.5rem;
    border-radius: 9999px;
    background: linear-gradient(135deg, #FF4D00, #FF9E00);
    color: #fff;
    font-weight: 700;
    font-size: .875rem;
    line-height: 1.5;
    box-shadow: 0 10px 30px rgba(255, 77, 0, .3);
    transition: all .3s;
    white-space: nowrap;
  }

  .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 40px rgba(255, 77, 0, .45);
    filter: brightness(1.1);
  }

  .btn-primary:focus-visible {
    outline: none;
    box-shadow: 0 0 0 4px rgba(255, 77, 0, .35);
  }

  .btn-primary:active {
    transform: scale(.98);
  }

  .btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .5rem;
    padding: .75rem 1.5rem;
    border-radius: 9999px;
    border: 1px solid rgba(255, 255, 255, .2);
    color: var(--text-light);
    font-weight: 600;
    font-size: .875rem;
    line-height: 1.5;
    transition: all .3s;
    white-space: nowrap;
  }

  .btn-outline:hover {
    border-color: rgba(255, 77, 0, .5);
    color: var(--primary-light);
    background: rgba(255, 77, 0, .08);
  }

  .btn-outline:focus-visible {
    outline: none;
    box-shadow: 0 0 0 4px rgba(255, 77, 0, .25);
  }

  .btn-outline:active {
    transform: scale(.98);
  }

  .nav-link {
    display: inline-flex;
    align-items: center;
    height: 2.5rem;
    padding: 0 .875rem;
    border-radius: 9999px;
    font-size: .875rem;
    font-weight: 500;
    color: var(--text-dim);
    transition: all .25s;
    white-space: nowrap;
  }

  .nav-link:hover {
    color: var(--text-light);
    background: rgba(255, 255, 255, .06);
  }

  .nav-link:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 77, 0, .4);
  }

  .nav-link.active {
    color: #fff;
    background: linear-gradient(135deg, rgba(255, 77, 0, .88), rgba(255, 158, 0, .88));
    box-shadow: 0 4px 18px rgba(255, 77, 0, .3);
  }

  .card {
    background: rgba(255, 255, 255, .04);
    border: 1px solid rgba(255, 255, 255, .08);
    border-radius: 24px;
    box-shadow: var(--shadow-card);
    transition: all .3s;
  }

  .card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, .12);
    box-shadow: var(--shadow-card), var(--shadow-glow);
  }

  .card-sm {
    border-radius: 16px;
  }

  .badge {
    display: inline-flex;
    align-items: center;
    gap: .25rem;
    padding: .25rem .625rem;
    border-radius: 9999px;
    font-size: .75rem;
    font-weight: 600;
    background: rgba(255, 77, 0, .12);
    color: var(--primary-light);
    border: 1px solid rgba(255, 77, 0, .25);
    white-space: nowrap;
  }

  .badge-accent {
    background: rgba(0, 229, 255, .1);
    color: var(--accent);
    border-color: rgba(0, 229, 255, .25);
  }

  .data-badge {
    border-radius: 16px;
    background: rgba(255, 255, 255, .05);
    border: 1px solid rgba(255, 255, 255, .1);
    padding: 1.25rem 1.5rem;
    text-align: left;
  }

  .data-badge .number {
    background: linear-gradient(135deg, #FF4D00, #FF9E00);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-size: 2.25rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
  }

  @media (min-width: 768px) {
    .data-badge .number {
      font-size: 3rem;
    }
  }

  .hero-bg {
    background:
      linear-gradient(180deg, rgba(15, 13, 16, .45), rgba(15, 13, 16, .94)),
      url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  }

  .bg-grid-pattern {
    background-image:
      linear-gradient(45deg, rgba(255, 255, 255, .02) 25%, transparent 25%),
      linear-gradient(-45deg, rgba(255, 255, 255, .02) 25%, transparent 25%);
    background-size: 24px 24px;
  }

  .faq-item {
    border: 1px solid rgba(255, 255, 255, .08);
    border-radius: 16px;
    background: rgba(255, 255, 255, .03);
    transition: all .3s;
    overflow: hidden;
  }

  .faq-item:hover {
    border-color: rgba(255, 255, 255, .14);
  }

  .faq-item.open {
    border-color: rgba(255, 77, 0, .5);
    background: rgba(255, 77, 0, .04);
  }

  .faq-icon {
    flex-shrink: 0;
    width: 2rem;
    height: 2rem;
    border-radius: 9999px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(255, 255, 255, .15);
    color: var(--text-dim);
    font-size: 1.25rem;
    font-weight: 300;
    transition: transform .3s, color .3s, border-color .3s;
  }

  .faq-item.open .faq-icon {
    transform: rotate(45deg);
    color: #fff;
    border-color: rgba(255, 77, 0, .5);
    background: rgba(255, 77, 0, .15);
  }

  .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height .35s ease, padding .35s ease;
  }

  .faq-item.open .faq-answer {
    max-height: 400px;
    padding: 0 1.25rem 1.25rem 3.25rem;
  }

  @media (min-width: 768px) {
    .faq-item.open .faq-answer {
      padding-left: 4.5rem;
    }
  }

  .input-dark {
    background: rgba(255, 255, 255, .05);
    border: 1px solid rgba(255, 255, 255, .12);
    border-radius: 12px;
    color: var(--text-light);
    font-size: .875rem;
    padding: .75rem 1rem;
    transition: all .25s;
    width: 100%;
  }

  .input-dark::placeholder {
    color: rgba(255, 255, 255, .35);
  }

  .input-dark:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(255, 77, 0, .15);
  }

  .process-line {
    position: relative;
  }

  .process-line::before {
    content: '';
    position: absolute;
    left: 1.5rem;
    top: 3.5rem;
    bottom: -2rem;
    width: 1px;
    background: linear-gradient(180deg, rgba(255, 77, 0, .5), rgba(255, 158, 0, .15));
  }

  @media (min-width: 768px) {
    .process-line::before {
      left: auto;
      top: auto;
      bottom: auto;
      right: 50%;
      top: 3.5rem;
      width: auto;
      height: 1px;
      background: linear-gradient(90deg, rgba(255, 77, 0, .5), rgba(255, 158, 0, .15));
    }
  }

  .feature-icon {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }

  .footer-link {
    color: var(--text-dim);
    transition: color .25s;
  }

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

  .float-cta {
    background: linear-gradient(135deg, #FF4D00, #FF9E00);
    border-radius: 9999px;
    box-shadow: 0 10px 40px rgba(255, 77, 0, .4);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: .5rem;
    transition: all .3s;
  }

  .float-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 50px rgba(255, 77, 0, .55);
  }

  .float-cta:active {
    transform: scale(.97);
  }

  @media (max-width: 767px) {
    .float-cta-desktop {
      display: none;
    }
    .float-cta-mobile {
      display: flex;
    }
  }

  @media (min-width: 768px) {
    .float-cta-mobile {
      display: none;
    }
  }

  .section-padding {
    padding-top: 5rem;
    padding-bottom: 5rem;
  }

  @media (min-width: 768px) {
    .section-padding {
      padding-top: 7rem;
      padding-bottom: 7rem;
    }
  }