/* roulang page: index */
:root {
    --bg-deep: #070B14;
    --bg-elev: #0E1524;
    --bg-sunken: #05070D;
    --primary: #67E8F9;
    --primary-deep: #22D3EE;
    --accent: #FDE047;
    --text-head: #F8FAFC;
    --text-body: #9AA6B7;
    --text-weak: #64748B;
    --border-card: rgba(148,163,184,0.12);
    --radius-card: 16px;
    --radius-btn: 10px;
  }

  html { scroll-behavior: smooth; }

  body {
    background: var(--bg-deep);
    font-family: "PingFang SC", "Microsoft YaHei", "Inter", -apple-system, sans-serif;
    color: #cbd5e1;
    overflow-x: hidden;
    line-height: 1.7;
  }

  h1, h2, h3, h4, .font-display {
    font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text-head);
  }

  .container-xk {
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }

  @media (min-width: 640px) {
    .container-xk { padding-left: 1.5rem; padding-right: 1.5rem; }
  }

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

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

  @media (min-width: 768px) {
    .section-pad { padding-top: 6.5rem; padding-bottom: 6.5rem; }
  }

  .section-kicker {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    letter-spacing: 0.18em;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    background: rgba(34,211,238,0.08);
    border: 1px solid rgba(34,211,238,0.16);
    padding: 0.35rem 0.85rem;
    border-radius: 999px;
  }

  .grad-text {
    background: linear-gradient(120deg, #ffffff 10%, #67E8F9 55%, #22D3EE 80%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, #67E8F9, #22D3EE);
    color: #062A35;
    font-weight: 700;
    font-size: 0.95rem;
    padding: 0.8rem 1.5rem;
    border-radius: 10px;
    transition: all 0.2s ease;
    box-shadow: 0 4px 24px rgba(34,211,238,0.18);
  }

  .btn-primary:hover { filter: brightness(1.08); box-shadow: 0 8px 30px rgba(34,211,238,0.28); transform: translateY(-1px); }
  .btn-primary:active { transform: translateY(1px); }
  .btn-primary:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

  .btn-ghost {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(148,163,184,0.22);
    color: #f1f5f9;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.8rem 1.4rem;
    border-radius: 10px;
    transition: all 0.2s ease;
  }

  .btn-ghost:hover { border-color: rgba(34,211,238,0.55); color: var(--primary); background: rgba(34,211,238,0.05); }
  .btn-ghost:focus-visible { outline: 2px solid var(--primary); outline-offset: 3px; }

  .nav-link {
    position: relative;
    display: inline-flex;
    align-items: center;
    font-size: 0.94rem;
    font-weight: 500;
    color: #94a3b8;
    padding: 0.4rem 0.2rem;
    border-radius: 0.375rem;
    transition: color 0.2s;
  }

  .nav-link:hover { color: #f8fafc; }
  .nav-link.active { color: var(--primary); }
  .nav-link.active::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -6px;
    height: 2px;
    width: 24px;
    margin: 0 auto;
    border-radius: 2px;
    background: var(--primary);
    box-shadow: 0 0 12px rgba(103,232,249,0.8);
  }

  .card-surface {
    background: rgba(14,21,36,0.74);
    border: 1px solid var(--border-card);
    border-radius: 16px;
    backdrop-filter: blur(6px);
    transition: border-color 0.25s, box-shadow 0.3s, transform 0.2s;
    position: relative;
  }

  .card-surface::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, rgba(34,211,238,0), rgba(34,211,238,0.45), rgba(34,211,238,0));
    opacity: 0;
    transition: opacity 0.25s;
  }

  .card-surface:hover {
    border-color: rgba(34,211,238,0.28);
    box-shadow: 0 0 0 1px rgba(34,211,238,0.12), 0 20px 44px rgba(34,211,238,0.08);
    transform: translateY(-4px);
  }

  .card-surface:hover::before { opacity: 1; }

  .img-cover {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: inherit;
  }

  .input-basic {
    background: #0B1120;
    border: 1px solid rgba(148,163,184,0.18);
    border-radius: 10px;
    padding: 0.75rem 1rem;
    width: 100%;
    color: #f8fafc;
    font-size: 0.95rem;
    transition: border-color 0.2s, box-shadow 0.2s;
  }

  .input-basic::placeholder { color: #64748B; }
  .input-basic:focus { border-color: rgba(34,211,238,0.7); outline: none; box-shadow: 0 0 0 3px rgba(34,211,238,0.14); }

  .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(14,21,36,0.5);
    border: 1px solid rgba(148,163,184,0.12);
    border-radius: 14px;
    overflow: hidden;
    transition: border-color 0.2s;
  }

  .faq-item:hover { border-color: rgba(103,232,249,0.24); }
  .faq-item.open { border-color: rgba(34,211,238,0.35); }

  .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.32s ease;
  }

  .faq-item.open .faq-answer { max-height: 480px; }

  .mega-panel {
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px) scale(0.98);
    transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s;
  }

  .mega-panel.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
  }

  .badge-dot {
    width: 7px;
    height: 7px;
    border-radius: 999px;
    display: inline-block;
  }

  ul, ol { list-style: none; }
  a, button, input, textarea, select { -webkit-tap-highlight-color: transparent; }
  a { text-decoration: none; color: inherit; }

  .hero-bg {
    background:
      linear-gradient(90deg, rgba(7,11,20,0.92) 0%, rgba(7,11,20,0.7) 40%, rgba(7,11,20,0.35) 100%),
      url("/assets/images/backpic/back-1.webp") center center / cover no-repeat;
  }

  @media (max-width: 767px) {
    .hero-bg { background: linear-gradient(180deg, rgba(7,11,20,0.92) 10%, rgba(7,11,20,0.76) 100%), url("/assets/images/backpic/back-1.webp") center center / cover no-repeat; }
  }

  .dotted-layer::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background-image: radial-gradient(rgba(148,163,184,0.3) 1px, transparent 1px);
    background-size: 26px 26px;
    opacity: 0.5;
    border-radius: inherit;
  }

  .modal-mask { transition: opacity 0.25s; }
  .modal-mask.closed { opacity: 0; visibility: hidden; pointer-events: none; }
  .modal-mask.closed .modal-card { transform: translateY(20px) scale(0.96); }
  .modal-card { transition: transform 0.28s ease; }

  .phone-card-icon {
    width: 42px; height: 42px; display: grid; place-items: center;
    background: rgba(34,211,238,0.09);
    border: 1px solid rgba(34,211,238,0.14);
    border-radius: 10px;
    color: var(--primary);
  }

  @keyframes pulse-soft {
    0%, 100% { box-shadow: 0 0 0 0 rgba(34,211,238,0.35); }
    55% { box-shadow: 0 0 0 14px rgba(34,211,238,0); }
  }

  .pulse-soft { animation: pulse-soft 2.6s infinite; }

  @keyframes float-y {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-7px); }
  }

  .float-y { animation: float-y 4s ease-in-out infinite; }

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

/* roulang page: article */
:root {
  --bg-deep: #070B14;
  --bg-elev: #0E1524;
  --bg-sunken: #05070D;
  --primary: #22D3EE;
  --primary-light: #67E8F9;
  --primary-dim: #155E75;
  --accent: #FDE047;
  --text-title: #F8FAFC;
  --text-body: #9AA6B7;
  --text-mute: #5E6879;
  --border-white: rgb(148 163 184 / .12);
  --radius-card: 16px;
  --radius-btn: 10px;
  --shadow-card: 0 8px 30px rgb(0 0 0 / .3);
}
html { scroll-behavior: smooth; }
body {
  background: var(--bg-deep);
  background-image: radial-gradient(600px at 80% -10%, rgb(34 211 238 / .07), transparent 60%);
  color: var(--text-body);
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
.container-xk { max-width: 1200px; margin: 0 auto; padding-left: 1.25rem; padding-right: 1.25rem; }
@media (min-width: 640px) { .container-xk { padding-left: 1.5rem; padding-right: 1.5rem; } }
@media (min-width: 1024px) { .container-xk { padding-left: 2rem; padding-right: 2rem; } }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 6px; }

.nav-link {
  display: inline-block;
  color: #C7D0DF;
  font-size: 15px;
  font-weight: 500;
  line-height: 72px;
  position: relative;
  transition: color .2s ease;
  white-space: nowrap;
}
.nav-link:hover { color: #fff; }
.nav-link.active { color: #fff; }
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 16px;
  left: 0;
  width: 100%;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--primary-light), transparent);
  box-shadow: 0 0 12px rgb(34 211 238 / .6);
}

.mega-panel { opacity: 0; visibility: hidden; transform: translateY(8px); transition: opacity .2s ease, transform .2s ease, visibility .2s; }
.mega-panel.open { opacity: 1; visibility: visible; transform: translateY(0); }

.mobile-drawer { transform: translateX(100%); transition: transform .3s ease; }
.mobile-drawer.open { transform: translateX(0); }

.article-hero {
  background-image: linear-gradient(rgba(7, 11, 20, .78), rgba(7, 11, 20, .92)), url('/assets/images/backpic/back-1.webp');
  background-size: cover;
  background-position: center;
}

.article-content { color: #A6B3C5; font-size: 17px; line-height: 2; word-break: break-word; }
.article-content > * { margin-bottom: 1.4em; }
.article-content h2 {
  color: #F8FAFC;
  font-size: 24px;
  font-weight: 700;
  margin-top: 2em;
  padding-left: 14px;
  border-left: 4px solid var(--primary);
  line-height: 1.5;
}
.article-content h3 {
  color: #F1F5F9;
  font-size: 20px;
  font-weight: 600;
  margin-top: 1.8em;
}
.article-content h4 {
  color: #E2E8F0;
  font-size: 17px;
  font-weight: 600;
  margin-top: 1.5em;
}
.article-content p { color: #A6B3C5; }
.article-content a { color: #22D3EE; border-bottom: 1px solid rgb(34 211 238 / .3); padding-bottom: 2px; transition: color .2s; }
.article-content a:hover { color: #67E8F9; }
.article-content ul { list-style: none; padding-left: 0; }
.article-content ul li { position: relative; padding-left: 24px; margin-bottom: 12px; }
.article-content ul li::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  position: absolute;
  left: 4px; top: 12px;
  background: var(--primary);
  box-shadow: 0 0 8px rgb(34 211 238 / .5);
}
.article-content ol { list-style: none; counter-reset: cnt; padding-left: 0; }
.article-content ol li { counter-increment: cnt; position: relative; padding-left: 36px; margin-bottom: 14px; }
.article-content ol li::before {
  content: counter(cnt);
  position: absolute;
  left: 0; top: 4px;
  width: 24px; height: 24px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgb(34 211 238 / .12);
  border: 1px solid rgb(34 211 238 / .2);
  color: #67E8F9;
  font-size: 12px;
  font-weight: 700;
}
.article-content blockquote {
  border-left: 3px solid var(--primary);
  background: rgb(34 211 238 / .06);
  padding: 16px 20px;
  border-radius: 0 12px 12px 0;
  color: #DDE5EE;
}
.article-content blockquote p { margin-bottom: 0; color: #DDE5EE; }
.article-content code {
  background: rgb(15 23 42 / .9);
  border: 1px solid rgb(148 163 184 / .2);
  border-radius: 6px;
  padding: 2px 8px;
  color: #E2E8F0;
  font-size: 14px;
}
.article-content pre {
  background: #0B1120;
  border: 1px solid rgb(148 163 184 / .12);
  border-radius: 14px;
  padding: 20px;
  overflow-x: auto;
  margin-bottom: 1.6em;
}
.article-content pre code { background: none; border: none; padding: 0; color: #E2E8F0; }
.article-content table { width: 100%; border-collapse: collapse; margin-bottom: 1.6em; }
.article-content th { background: #0E1524; color: #E2E8F0; text-align: left; padding: 10px 14px; border-bottom: 1px solid rgb(34 211 238 / .3); font-weight: 600; }
.article-content td { padding: 10px 14px; border-bottom: 1px solid rgb(148 163 184 / .1); color: #A6B3C5; }
.article-content tr:hover td { background: rgb(34 211 238 / .03); }
.article-content img { border-radius: 14px; box-shadow: 0 12px 30px rgb(0 0 0 / .3); }
.article-content hr { border: none; height: 1px; background: linear-gradient(90deg, transparent, rgb(148 163 184 / .2), transparent); margin: 2.4em 0; }

.lead-block {
  border-left: 4px solid #67E8F9;
  background: rgb(34 211 238 / .06);
  border-radius: 0 14px 14px 0;
  padding: 18px 20px;
  color: #DDE5EE;
  font-size: 16px;
  line-height: 1.9;
}
.card-hover { transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease; }
.card-hover:hover {
  transform: translateY(-4px);
  border-color: rgb(34 211 238 / .25);
  box-shadow: 0 0 0 1px rgb(34 211 238 / .12), 0 12px 40px rgb(34 211 238 / .07), 0 8px 30px rgb(0 0 0 / .3);
}
.badge-dot { width: 6px; height: 6px; border-radius: 999px; display: inline-block; }
@media (max-width: 1023px) {
  .desktop-nav { display: none !important; }
  .nav-mobile-btn { display: inline-flex !important; }
}

/* roulang page: category1 */
:root {
            --bg-deep: #070B14;
            --bg-elev: #0E1524;
            --bg-sunken: #05070D;
            --bg-card-soft: rgba(14, 21, 36, 0.86);
            --primary: #67E8F9;
            --primary-strong: #22D3EE;
            --primary-dim: #155E75;
            --accent: #FDE047;
            --risk: #F87171;
            --ok: #34D399;
            --title: #F8FAFC;
            --body: #9AA6B7;
            --muted: #64748B;
            --border: rgba(148, 163, 184, 0.12);
            --border-hover: rgba(34, 211, 238, 0.25);
            --radius-card: 16px;
            --radius-btn: 10px;
            --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.30);
            --shadow-card-hover: 0 0 0 1px rgba(34, 211, 238, 0.15), 0 12px 40px rgba(34, 211, 238, 0.07);
            --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
        }

        * {
            box-sizing: border-box;
        }
        html {
            -webkit-text-size-adjust: 100%;
            scroll-behavior: smooth;
        }
        body {
            margin: 0;
            background: var(--bg-deep);
            color: var(--body);
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.75;
            overflow-x: hidden;
        }
        a {
            color: inherit;
            text-decoration: none;
        }
        img {
            max-width: 100%;
            display: block;
            height: auto;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            color: inherit;
        }
        button {
            cursor: pointer;
            border: 0;
            background: none;
        }
        h1,
        h2,
        h3,
        h4,
        p,
        ul,
        ol,
        figure,
        blockquote {
            margin: 0;
        }

        .container-xk {
            width: 100%;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1rem;
            padding-right: 1rem;
        }

        @media (min-width: 640px) {
            .container-xk {
                padding-left: 1.5rem;
                padding-right: 1.5rem;
            }
        }
        @media (min-width: 1024px) {
            .container-xk {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }

        .bg-noise {
            background-image: radial-gradient(rgba(148, 163, 184, 0.16) 1px, transparent 1px);
            background-size: 20px 20px;
        }

        .header-clip {
            background: linear-gradient(180deg, rgba(7, 11, 20, 0.40) 0%, rgba(7, 11, 20, 0.88) 100%);
        }

        .nav-link {
            position: relative;
            display: inline-flex;
            align-items: center;
            font-size: 15px;
            font-weight: 500;
            color: rgba(203, 213, 225, 0.72);
            padding: 6px 2px;
            transition: color 0.2s ease;
            letter-spacing: 0.02em;
        }
        .nav-link:hover {
            color: var(--primary);
        }
        .nav-link.active {
            color: var(--primary-strong);
            font-weight: 700;
        }
        .nav-link.active::after {
            content: "";
            position: absolute;
            left: 50%;
            bottom: -4px;
            width: 22px;
            height: 2px;
            border-radius: 999px;
            background: var(--primary-strong);
            transform: translateX(-50%);
            box-shadow: 0 0 12px rgba(34, 211, 238, 0.60);
        }

        .mega-panel {
            opacity: 0;
            visibility: hidden;
            transform: translateY(10px);
            transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s;
            pointer-events: none;
        }
        .mega-trigger-wrap.open .mega-panel {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
            pointer-events: auto;
        }
        .mega-trigger-wrap.open #megaArrow {
            transform: rotate(180deg);
        }

        .mobile-menu {
            position: fixed;
            top: 72px;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(7, 11, 20, 0.97);
            backdrop-filter: blur(24px);
            opacity: 0;
            visibility: hidden;
            transform: translateY(-6px);
            transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
            overflow-y: auto;
            padding: 28px 24px 40px;
            z-index: 30;
        }
        .mobile-menu.open {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: linear-gradient(135deg, #22D3EE, #67E8F9);
            color: #062A35;
            font-weight: 700;
            font-size: 15px;
            line-height: 1;
            padding: 13px 22px;
            border-radius: var(--radius-btn);
            box-shadow: 0 10px 24px rgba(34, 211, 238, 0.20);
            transition: filter 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
        }
        .btn-primary:hover {
            filter: brightness(1.08);
            box-shadow: 0 12px 28px rgba(34, 211, 238, 0.28);
            transform: translateY(-1px);
        }
        .btn-primary:active {
            transform: translateY(1px);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.14);
            color: rgba(248, 250, 252, 0.90);
            font-weight: 500;
            font-size: 14px;
            line-height: 1;
            padding: 12px 20px;
            border-radius: var(--radius-btn);
            transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
        }
        .btn-secondary:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: rgba(34, 211, 238, 0.05);
        }
        .btn-secondary:active {
            transform: translateY(1px);
        }

        .nav-cta {
            padding: 9px 16px;
            font-size: 14px;
            border-radius: 10px;
            background: rgba(103, 232, 249, 0.08);
            border: 1px solid rgba(103, 232, 249, 0.20);
            color: #E2E8F0;
            font-weight: 600;
            transition: all 0.2s ease;
        }
        .nav-cta:hover {
            background: rgba(103, 232, 249, 0.16);
            color: #FFFFFF;
            border-color: rgba(103, 232, 249, 0.40);
        }

        .kicker {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--primary-strong);
            font-size: 13px;
            font-weight: 700;
            letter-spacing: 0.12em;
        }
        .kicker::before {
            content: "";
            width: 18px;
            height: 1px;
            background: var(--primary-strong);
            box-shadow: 0 0 10px rgba(34, 211, 238, 0.60);
        }

        .card {
            background: var(--bg-elev);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
        }
        .card:hover {
            border-color: var(--border-hover);
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
        }

        .mini-card {
            display: block;
            overflow: hidden;
            background: #0E1524;
            border: 1px solid rgba(148, 163, 184, 0.12);
            border-radius: 14px;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.20);
            transition: all 0.25s ease;
        }
        .mini-card:hover {
            border-color: rgba(34, 211, 238, 0.28);
            box-shadow: 0 0 0 1px rgba(34, 211, 238, 0.12), 0 14px 34px rgba(34, 211, 238, 0.08);
            transform: translateY(-3px);
        }

        .topic-card {
            position: relative;
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
            min-height: 280px;
            border-radius: 18px;
            overflow: hidden;
            border: 1px solid rgba(148, 163, 184, 0.14);
            padding: 24px;
            background-size: cover;
            background-position: center;
            isolation: isolate;
            transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
        }
        .topic-card::after {
            content: "";
            position: absolute;
            inset: 0;
            z-index: -1;
            background: linear-gradient(180deg, rgba(5, 7, 13, 0.20) 0%, rgba(5, 7, 13, 0.90) 100%);
        }
        .topic-card:hover {
            border-color: rgba(34, 211, 238, 0.32);
            transform: translateY(-4px);
            box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
        }

        .step-card {
            background: rgba(14, 21, 36, 0.85);
            border: 1px solid rgba(148, 163, 184, 0.10);
            border-radius: 14px;
            padding: 22px;
            transition: all 0.25s ease;
            position: relative;
        }
        .step-card:hover {
            border-color: rgba(34, 211, 238, 0.24);
            background: #0E1524;
            transform: translateY(-3px);
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.25);
        }

        .faq-item {
            background: rgba(14, 21, 36, 0.72);
            border: 1px solid rgba(148, 163, 184, 0.10);
            border-radius: 14px;
            transition: border-color 0.2s ease, background 0.2s ease;
        }
        .faq-item.open {
            border-color: rgba(34, 211, 238, 0.26);
            background: rgba(14, 21, 36, 0.96);
        }
        .faq-q {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            width: 100%;
            padding: 18px 20px;
            text-align: left;
            color: #E2E8F0;
            font-weight: 600;
            font-size: 16px;
        }
        .faq-icon {
            flex: 0 0 auto;
            color: var(--primary-strong);
            transition: transform 0.3s ease;
        }
        .faq-item.open .faq-icon {
            transform: rotate(135deg);
        }
        .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
        }
        .faq-item.open .faq-a {
            max-height: 420px;
        }
        .faq-a-inner {
            padding: 0 20px 18px;
            color: rgba(154, 166, 183, 0.90);
            font-size: 15px;
            line-height: 1.8;
        }

        .input-xk {
            width: 100%;
            background: #0B1120;
            border: 1px solid rgba(148, 163, 184, 0.18);
            border-radius: 10px;
            padding: 12px 16px;
            font-size: 15px;
            color: #F8FAFC;
            transition: border-color 0.2s ease, box-shadow 0.2s ease;
            outline: none;
        }
        .input-xk:focus {
            border-color: var(--primary-strong);
            box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.16);
        }
        .input-xk::placeholder {
            color: #475569;
        }

        .badge-dot {
            display: inline-block;
            width: 6px;
            height: 6px;
            border-radius: 999px;
            flex: 0 0 auto;
        }

        .tag-pill {
            display: inline-block;
            border: 1px solid rgba(148, 163, 184, 0.16);
            background: rgba(148, 163, 184, 0.05);
            color: #94A3B8;
            font-size: 13px;
            border-radius: 999px;
            padding: 5px 12px;
            transition: all 0.2s ease;
        }
        .tag-pill:hover {
            color: #67E8F9;
            border-color: rgba(34, 211, 238, 0.30);
            background: rgba(34, 211, 238, 0.06);
        }

        .clamp1 {
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .clamp2 {
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .clamp3 {
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .modal-mask {
            position: fixed;
            inset: 0;
            z-index: 60;
            background: rgba(3, 6, 12, 0.78);
            backdrop-filter: blur(10px);
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.2s ease, visibility 0.2s ease;
        }
        .modal-mask.open {
            opacity: 1;
            visibility: visible;
        }
        .modal-card {
            width: 100%;
            max-width: 520px;
            background: #0E1524;
            border: 1px solid rgba(148, 163, 184, 0.16);
            border-radius: 18px;
            box-shadow: 0 24px 60px rgba(0, 0, 0, 0.50);
            padding: 24px;
            transform: translateY(12px) scale(0.98);
            transition: transform 0.25s ease;
        }
        .modal-mask.open .modal-card {
            transform: translateY(0) scale(1);
        }

        .fab {
            position: fixed;
            right: 20px;
            bottom: 22px;
            z-index: 42;
            width: 54px;
            height: 54px;
            border-radius: 999px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #22D3EE, #67E8F9);
            color: #062A35;
            box-shadow: 0 12px 32px rgba(34, 211, 238, 0.28);
            transition: transform 0.2s ease, filter 0.2s ease;
        }
        .fab:hover {
            transform: translateY(-2px);
            filter: brightness(1.08);
        }

        @media (max-width: 639px) {
            .topic-card {
                min-height: 220px;
                padding: 18px;
            }
            .fab {
                width: 48px;
                height: 48px;
                right: 16px;
                bottom: 16px;
            }
            .container-xk {
                padding-left: 18px;
                padding-right: 18px;
            }
        }
        @media (max-width: 380px) {
            .btn-primary,
            .btn-secondary {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

/* roulang page: category2 */
:root {
            --bg-deep: #070B14;
            --bg-elev: #0E1524;
            --bg-sunken: #05070D;
            --primary: #67E8F9;
            --primary-dim: #155E75;
            --accent: #FDE047;
            --border-card: rgba(148,163,184,0.16);
            --radius-card: 16px;
            --radius-btn: 10px;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            background-color: var(--bg-deep);
            color: #94A3B8;
            font-family: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
            line-height: 1.7;
            background-image: radial-gradient(800px 500px at 90% -10%, rgba(34,211,238,0.07), transparent 60%),
                              radial-gradient(600px 300px at -5% 30%, rgba(253,224,71,0.03), transparent 50%);
            -webkit-font-smoothing: antialiased;
        }
        .container-xk { max-width: 1200px; margin: 0 auto; padding-left: 1.25rem; padding-right: 1.25rem; }
        @media (min-width: 768px) { .container-xk { padding-left: 2rem; padding-right: 2rem; } }
        .nav-link {
            color: #cbd5e1; font-size: 15px; font-weight: 500; text-decoration: none;
            padding: 8px 2px; position: relative; transition: color .2s, opacity .2s; white-space: nowrap;
        }
        .nav-link:hover { color: #67E8F9; }
        .nav-link.active { color: #67E8F9; font-weight: 600; }
        .nav-link.active::after {
            content: ''; position: absolute; left: 0; bottom: -4px; width: 100%; height: 2px;
            background: linear-gradient(90deg, #67E8F9, transparent); border-radius: 999px;
        }
        #megaPanel {
            visibility: hidden; opacity: 0; transform: translateY(8px);
            transition: all .2s ease;
        }
        #megaTriggerWrap.show #megaPanel,
        #megaTriggerWrap:hover #megaPanel { visibility: visible; opacity: 1; transform: translateY(0); }
        #megaTriggerWrap.show #megaArrow { transform: rotate(180deg); }
        .badge-dot { width: 8px; height: 8px; border-radius: 999px; display: inline-block; }
        .hero-banner {
            background-image: linear-gradient(90deg, rgba(7,11,20,.92) 0%, rgba(13,18,34,.75) 55%, rgba(7,11,20,.6) 100%),
                              url('/assets/images/backpic/back-2.png');
            background-size: cover; background-position: center 10%;
        }
        .card-surface {
            background: rgba(14, 21, 36, 0.78);
            border: 1px solid rgba(148,163,184,0.14);
            border-radius: var(--radius-card);
            backdrop-filter: blur(3px);
            transition: all .25s ease-out;
        }
        .card-surface:hover {
            border-color: rgba(34, 211, 238, 0.35);
            box-shadow: 0 0 0 1px rgba(34, 211, 238, 0.05), 0 18px 34px rgba(0,0,0,.45);
            transform: translateY(-3px);
        }
        .card-surface-topline::before {
            content: ''; display: block; height: 1px;
            background: linear-gradient(90deg, rgba(34,211,238,.7), transparent 80%);
            margin-bottom: 14px; opacity: .6;
        }
        .btn-xk-primary {
            display: inline-flex; align-items: center; justify-content: center; gap: 8px;
            background: linear-gradient(135deg, #67E8F9, #22D3EE);
            color: #062A35; font-weight: 700; padding: 12px 24px; font-size: 15px;
            border-radius: var(--radius-btn); border: none; cursor: pointer;
            transition: all .2s; box-shadow: 0 6px 18px rgba(34,211,238,.18);
        }
        .btn-xk-primary:hover { filter: brightness(1.06); transform: translateY(-1px); box-shadow: 0 9px 26px rgba(34,211,238,.3); }
        .btn-xk-primary:active { transform: translateY(1px); }
        .btn-xk-secondary {
            display: inline-flex; align-items: center; justify-content: center; gap: 8px;
            background: rgba(255,255,255,.06); border: 1px solid rgba(148,163,184,.3);
            color: #fff; font-weight: 600; padding: 12px 24px; font-size: 15px;
            border-radius: var(--radius-btn); transition: all .2s;
        }
        .btn-xk-secondary:hover { border-color: #67E8F9; color: #67E8F9; background: rgba(34,211,238,.05); }
        .kicker {
            letter-spacing: .18em; font-size: 12px; font-weight: 600; color: #67E8F9;
            text-transform: uppercase; margin-bottom: 12px;
        }
        .journey-tab { border: 1px solid rgba(148,163,184,0.18); border-radius: 999px; background: transparent; color:#cbd5e1; padding: 8px 20px; font-size:14px; cursor: pointer; transition: all .2s; }
        .journey-tab:hover, .journey-tab.active { background: rgba(34,211,238,.12); border-color:#67E8F9; color:#67E8F9; }
        .guide-row { transition: background .2s; }
        .guide-row:hover { background: rgba(34,211,238,.03); }
        .faq-item { border-bottom: 1px solid rgba(148,163,184,0.12); }
        .faq-question::after { content: '+'; position: absolute; right: 0; top: 2px; font-size: 22px; color:#67E8F9; font-weight: 300; }
        .faq-item.open .faq-question::after { content: '–'; }
        input, select { background-color: #0B1120; border:1px solid rgba(148,163,184,0.2); }
        input:focus, select:focus { outline: none; border-color: #67E8F9; box-shadow: 0 0 0 3px rgba(34,211,238,.12); }
        .footer-grad-line { background: linear-gradient(90deg, transparent, rgba(103,232,249,.35), transparent); height: 1px; }