/* roulang page: index */
:root {
  --primary-start: #7B2FBE;
  --primary-end: #3B82F6;
  --primary-gradient: linear-gradient(135deg, #7B2FBE, #3B82F6);
  --primary-light: #8B5CF6;
  --accent: #F59E0B;
  --accent-light: #FEF3C7;
  --accent-dark: #D97706;
  --bg: #F8F9FC;
  --card-bg: #FFFFFF;
  --text-dark: #1F2937;
  --text-mid: #4B5563;
  --text-light: #9CA3AF;
  --border: #E5E7EB;
  --radius-lg: 16px;
  --radius-md: 8px;
  --radius-sm: 20px;
  --shadow-sm: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-hover: 0 8px 24px rgba(0,0,0,0.12);
  --font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --max-width: 1200px;
  --section-gap: 80px;
  --card-padding: 24px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-family);
  background: var(--bg);
  color: var(--text-dark);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}
.section { padding: var(--section-gap) 0; }
.section-title {
  font-size: 30px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
  color: var(--text-dark);
}
.section-sub {
  text-align: center;
  font-size: 16px;
  color: var(--text-mid);
  max-width: 680px;
  margin: 0 auto 48px;
}
/* Header & Nav */
.site-header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  height: 68px;
  display: flex;
  align-items: center;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 700;
  color: var(--primary-start);
  white-space: nowrap;
  width: 200px;
}
.logo-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  font-weight: 700;
  flex-shrink: 0;
}
.logo span { background: linear-gradient(135deg, var(--primary-start), var(--primary-end)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.nav-list {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-list a {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-mid);
  padding: 8px 0;
  position: relative;
  transition: color 0.2s;
  white-space: nowrap;
}
.nav-list a:hover { color: var(--primary-start); }
.nav-list a.active {
  color: var(--primary-start);
  font-weight: 600;
}
.nav-list a.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--primary-gradient);
  border-radius: 1px;
}
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.hamburger span { width: 26px; height: 2.5px; background: var(--text-dark); border-radius: 2px; transition: 0.3s; }
/* Hero */
.hero {
  background: linear-gradient(135deg, #F5F0FF 0%, #EBF4FF 50%, #F0F7FF 100%);
  position: relative;
  overflow: hidden;
  padding: 80px 0 60px;
}
.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -20%;
  width: 70%;
  height: 140%;
  background: radial-gradient(ellipse at center, rgba(123,47,190,0.06) 0%, transparent 70%);
  pointer-events: none;
}
.hero .container { position: relative; z-index: 1; display: flex; align-items: center; gap: 60px; }
.hero-left { flex: 1; }
.hero-left h1 {
  font-size: 38px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-dark);
  margin-bottom: 20px;
}
.hero-left h1 .highlight { background: linear-gradient(135deg, var(--primary-start), var(--primary-end)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-left p {
  font-size: 18px;
  color: var(--text-mid);
  line-height: 1.8;
  margin-bottom: 32px;
  max-width: 540px;
}
.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 40px;
  font-size: 20px;
  font-weight: 600;
  color: #fff;
  background: var(--primary-gradient);
  border-radius: var(--radius-md);
  box-shadow: 0 4px 20px rgba(123,47,190,0.3);
  transition: all 0.3s;
  border: none;
}
.hero-cta:hover { background: linear-gradient(135deg, #6B21A8, #2563EB); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(123,47,190,0.4); }
.hero-cta .arrow { transition: transform 0.3s; display: inline-block; }
.hero-cta:hover .arrow { transform: translateX(4px); }
.hero-right {
  flex: 0 0 400px;
  height: 320px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-hover);
  background: var(--card-bg);
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-right img { width: 100%; height: 100%; object-fit: cover; }
/* Features Carousel */
.features-carousel { background: var(--card-bg); }
.carousel-track { display: flex; gap: 24px; overflow-x: auto; scroll-snap-type: x mandatory; padding: 8px 0 24px; scrollbar-width: none; }
.carousel-track::-webkit-scrollbar { display: none; }
.carousel-card {
  flex: 0 0 calc(33.333% - 16px);
  scroll-snap-align: start;
  background: var(--bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s, box-shadow 0.3s;
}
.carousel-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.carousel-img {
  width: 100%;
  aspect-ratio: 2 / 1;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.carousel-img img { width: 100%; height: 100%; object-fit: cover; }
.carousel-body { padding: 20px var(--card-padding) var(--card-padding); }
.carousel-body h3 { font-size: 18px; font-weight: 600; margin-bottom: 8px; color: var(--text-dark); }
.carousel-body p { font-size: 14px; color: var(--text-mid); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.carousel-controls { display: flex; align-items: center; justify-content: center; gap: 16px; margin-top: 24px; }
.carousel-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--card-bg);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--text-mid);
  transition: 0.2s;
  cursor: pointer;
}
.carousel-btn:hover { background: var(--primary-start); color: #fff; border-color: var(--primary-start); }
.carousel-dots { display: flex; gap: 8px; }
.carousel-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
  cursor: pointer;
  transition: 0.2s;
}
.carousel-dots span.active { background: var(--primary-start); width: 28px; border-radius: 5px; }
/* How it works */
.how-it-works { background: var(--bg); }
.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.step-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: var(--card-padding);
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: 0.3s;
  position: relative;
}
.step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.step-num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary-gradient);
  color: #fff;
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}
.step-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.step-card p { font-size: 14px; color: var(--text-mid); line-height: 1.6; }
/* System Requirements */
.sys-req { background: var(--card-bg); }
.badge-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 16px; max-width: 900px; margin: 0 auto; }
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-light);
  color: #92400E;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  box-shadow: var(--shadow-sm);
  transition: 0.2s;
}
.badge:hover { transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.badge i { font-size: 18px; }
/* Testimonials */
.testimonials { background: var(--bg); }
.testimonial-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}
.testimonial-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: var(--card-padding);
  box-shadow: var(--shadow-sm);
  transition: 0.3s;
}
.testimonial-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.testimonial-card:last-child:nth-child(odd) { grid-column: 1 / -1; max-width: 50%; margin: 0 auto; }
.testi-header { display: flex; align-items: center; gap: 16px; margin-bottom: 16px; }
.testi-avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 24px;
  font-weight: 600;
  flex-shrink: 0;
}
.testi-info h4 { font-size: 16px; font-weight: 600; }
.testi-info span { font-size: 13px; color: var(--text-light); }
.testi-stars { color: var(--accent); font-size: 16px; margin-bottom: 8px; letter-spacing: 2px; }
.testi-text { font-size: 15px; color: var(--text-mid); font-style: italic; line-height: 1.7; }
/* Download */
.download-section { background: linear-gradient(135deg, #F5F0FF 0%, #EBF4FF 100%); }
.download-buttons { display: flex; justify-content: center; gap: 20px; flex-wrap: wrap; margin-bottom: 32px; }
.dl-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all 0.3s;
  border: 2px solid transparent;
}
.dl-btn-primary { background: var(--primary-gradient); color: #fff; box-shadow: 0 4px 16px rgba(123,47,190,0.25); }
.dl-btn-primary:hover { background: linear-gradient(135deg, #6B21A8, #2563EB); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(123,47,190,0.35); }
.dl-btn-accent { background: var(--accent); color: #fff; box-shadow: 0 4px 16px rgba(245,158,11,0.25); }
.dl-btn-accent:hover { background: var(--accent-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(245,158,11,0.35); }
.dl-btn-outline { background: transparent; border-color: var(--primary-start); color: var(--primary-start); }
.dl-btn-outline:hover { background: var(--primary-start); color: #fff; transform: translateY(-2px); }
.dl-qr { text-align: center; }
.dl-qr img { width: 120px; height: 120px; margin: 0 auto; border-radius: var(--radius-md); background: var(--card-bg); padding: 8px; box-shadow: var(--shadow-sm); }
.dl-qr p { font-size: 13px; color: var(--text-light); margin-top: 8px; }
/* Latest News */
.latest-news { background: var(--card-bg); }
.news-list { display: flex; flex-direction: column; gap: 20px; max-width: 900px; margin: 0 auto; }
.news-card {
  display: flex;
  gap: 20px;
  background: var(--bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: 0.3s;
}
.news-card:hover { box-shadow: var(--shadow-hover); transform: translateX(4px); }
.news-thumb {
  flex: 0 0 160px;
  min-height: 120px;
  background: var(--border);
  overflow: hidden;
}
.news-thumb img { width: 100%; height: 100%; object-fit: cover; }
.news-body { flex: 1; padding: 16px 20px 16px 0; display: flex; flex-direction: column; justify-content: center; }
.news-tag {
  display: inline-block;
  padding: 2px 12px;
  background: var(--primary-gradient);
  color: #fff;
  font-size: 12px;
  border-radius: 10px;
  margin-bottom: 8px;
  width: fit-content;
}
.news-body h3 { font-size: 18px; font-weight: 600; margin-bottom: 6px; color: var(--text-dark); }
.news-body h3 a { color: inherit; transition: color 0.2s; }
.news-body h3 a:hover { color: var(--primary-start); }
.news-body p { font-size: 14px; color: var(--text-mid); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; margin-bottom: 8px; }
.news-meta { font-size: 13px; color: var(--text-light); }
.news-empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-light);
}
.news-empty i { font-size: 48px; margin-bottom: 16px; display: block; }
.news-empty p { font-size: 16px; }
/* Footer */
.site-footer {
  background: #1F2937;
  color: #D1D5DB;
  padding: 48px 0 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}
.footer-col h4 { font-size: 16px; font-weight: 600; color: #F9FAFB; margin-bottom: 16px; }
.footer-col a { display: block; font-size: 14px; color: #9CA3AF; margin-bottom: 8px; transition: color 0.2s; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid #374151;
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 14px;
  color: #6B7280;
}
.footer-bottom a { color: #9CA3AF; }
.footer-bottom a:hover { color: var(--accent); }
/* Responsive */
@media (max-width: 1024px) {
  .hero .container { flex-direction: column; text-align: center; }
  .hero-left p { margin: 0 auto 32px; }
  .hero-right { flex: 0 0 100%; max-width: 500px; height: 260px; }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonial-card:last-child:nth-child(odd) { max-width: 100%; }
}
@media (max-width: 768px) {
  :root { --section-gap: 40px; }
  .hamburger { display: flex; }
  .nav-list { display: none; position: absolute; top: 68px; left: 0; width: 100%; background: var(--card-bg); flex-direction: column; padding: 16px 24px; gap: 4px; box-shadow: 0 12px 24px rgba(0,0,0,0.08); border-bottom: 1px solid var(--border); }
  .nav-list.open { display: flex; }
  .nav-list a { padding: 12px 0; width: 100%; border-bottom: 1px solid var(--border); }
  .nav-list a.active::after { display: none; }
  .nav-list a.active { background: linear-gradient(135deg, #F5F0FF, #EBF4FF); padding: 12px 16px; border-radius: var(--radius-md); border-bottom: none; }
  .hero-left h1 { font-size: 28px; }
  .hero-left p { font-size: 16px; }
  .hero-cta { font-size: 17px; padding: 14px 28px; }
  .carousel-card { flex: 0 0 100%; }
  .steps-grid { grid-template-columns: 1fr; }
  .testimonial-grid { grid-template-columns: 1fr; }
  .testimonial-card:last-child:nth-child(odd) { max-width: 100%; }
  .download-buttons { flex-direction: column; align-items: center; }
  .dl-btn { width: 100%; max-width: 280px; justify-content: center; }
  .news-card { flex-direction: column; }
  .news-thumb { flex: 0 0 160px; }
  .news-body { padding: 0 16px 16px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .section-title { font-size: 26px; }
}
@media (max-width: 520px) {
  .hero-left h1 { font-size: 24px; }
  .hero-right { height: 200px; }
  .logo { width: auto; font-size: 18px; }
  .footer-grid { grid-template-columns: 1fr; }
  .badge-grid { gap: 10px; }
  .badge { font-size: 13px; padding: 8px 16px; }
}

/* roulang page: article */
/* ===== Design Variables ===== */
    :root {
        --primary-from: #7B2FBE;
        --primary-to: #3B82F6;
        --primary-gradient: linear-gradient(135deg, #7B2FBE 0%, #3B82F6 100%);
        --accent: #F59E0B;
        --accent-hover: #D97706;
        --accent-light: #FEF3C7;
        --bg-body: #F8F9FC;
        --bg-card: #FFFFFF;
        --text-dark: #1F2937;
        --text-muted: #6B7280;
        --text-light: #9CA3AF;
        --border-color: #E5E7EB;
        --radius-lg: 16px;
        --radius-md: 8px;
        --radius-sm: 6px;
        --radius-pill: 20px;
        --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
        --shadow-card: 0 4px 12px rgba(0,0,0,0.06);
        --shadow-hover: 0 8px 24px rgba(0,0,0,0.12);
        --font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
        --max-width: 1200px;
        --nav-height: 72px;
        --spacer: 80px;
        --spacer-mobile: 40px;
    }

    /* ===== Reset & Base ===== */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
    body {
        font-family: var(--font-family);
        background-color: var(--bg-body);
        color: var(--text-dark);
        line-height: 1.7;
        font-size: 16px;
        padding-top: var(--nav-height);
    }
    a { color: inherit; text-decoration: none; transition: color 0.2s; }
    img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-md); }
    button, input, textarea { font-family: inherit; font-size: inherit; outline: none; border: none; }
    ul, ol { list-style: none; }
    h1, h2, h3, h4, h5, h6 { font-weight: 600; line-height: 1.3; color: var(--text-dark); }

    /* ===== Container ===== */
    .container {
        width: 100%;
        max-width: var(--max-width);
        margin: 0 auto;
        padding: 0 24px;
    }

    /* ===== Header / Nav ===== */
    .site-header {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 1000;
        height: var(--nav-height);
        background: var(--bg-card);
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 1px 4px rgba(0,0,0,0.04);
    }
    .header-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: 100%;
        max-width: var(--max-width);
        margin: 0 auto;
        padding: 0 24px;
    }
    .logo {
        display: flex;
        align-items: center;
        gap: 10px;
        flex-shrink: 0;
    }
    .logo-icon {
        width: 36px;
        height: 36px;
        background: var(--primary-gradient);
        border-radius: var(--radius-md);
        display: flex;
        align-items: center;
        justify-content: center;
        color: #fff;
        font-weight: 700;
        font-size: 18px;
    }
    .logo-text {
        font-size: 20px;
        font-weight: 700;
        background: var(--primary-gradient);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
        letter-spacing: 0.5px;
    }
    .nav-list {
        display: flex;
        align-items: center;
        gap: 32px;
    }
    .nav-list a {
        font-size: 15px;
        font-weight: 500;
        color: var(--text-dark);
        padding: 8px 0;
        position: relative;
        transition: color 0.2s;
    }
    .nav-list a::after {
        content: '';
        position: absolute;
        bottom: -2px;
        left: 0;
        right: 0;
        height: 2px;
        background: var(--primary-gradient);
        border-radius: 2px;
        opacity: 0;
        transform: scaleX(0);
        transition: opacity 0.3s, transform 0.3s;
    }
    .nav-list a:hover { color: var(--primary-from); }
    .nav-list a:hover::after { opacity: 1; transform: scaleX(1); }
    .nav-list a.active {
        font-weight: 600;
        color: var(--primary-from);
    }
    .nav-list a.active::after {
        opacity: 1;
        transform: scaleX(1);
    }
    .hamburger {
        display: none;
        flex-direction: column;
        gap: 5px;
        cursor: pointer;
        background: none;
        border: none;
        padding: 4px;
        z-index: 1100;
    }
    .hamburger span {
        display: block;
        width: 26px;
        height: 2.5px;
        background: var(--text-dark);
        border-radius: 3px;
        transition: all 0.3s;
    }
    .hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
    .hamburger.active span:nth-child(2) { opacity: 0; }
    .hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

    /* ===== Breadcrumb ===== */
    .breadcrumb-wrap {
        background: var(--bg-card);
        border-bottom: 1px solid var(--border-color);
        padding: 14px 0;
    }
    .breadcrumb {
        display: flex;
        align-items: center;
        gap: 8px;
        font-size: 14px;
        color: var(--text-muted);
        flex-wrap: wrap;
    }
    .breadcrumb a { color: var(--text-muted); }
    .breadcrumb a:hover { color: var(--primary-from); }
    .breadcrumb .sep { color: var(--text-light); user-select: none; }
    .breadcrumb .current { color: var(--text-dark); font-weight: 500; }

    /* ===== Article Main ===== */
    .article-section {
        padding: 48px 0 var(--spacer);
    }
    .article-layout {
        display: grid;
        grid-template-columns: 1fr 300px;
        gap: 48px;
    }
    .article-body {
        background: var(--bg-card);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-card);
        padding: 40px 48px;
    }
    .article-body h1 {
        font-size: 32px;
        font-weight: 700;
        line-height: 1.3;
        margin-bottom: 16px;
        color: var(--text-dark);
    }
    .article-meta {
        display: flex;
        align-items: center;
        gap: 20px;
        flex-wrap: wrap;
        margin-bottom: 28px;
        padding-bottom: 20px;
        border-bottom: 1px solid var(--border-color);
        font-size: 14px;
        color: var(--text-muted);
    }
    .article-meta .tag {
        display: inline-block;
        background: var(--primary-gradient);
        color: #fff;
        padding: 2px 14px;
        border-radius: var(--radius-pill);
        font-size: 12px;
        font-weight: 500;
    }
    .article-meta .date::before {
        content: '📅 ';
        font-size: 13px;
    }
    .article-content {
        font-size: 16px;
        line-height: 1.8;
        color: var(--text-dark);
    }
    .article-content h2 {
        font-size: 26px;
        font-weight: 600;
        margin: 36px 0 16px;
        padding-bottom: 8px;
        border-bottom: 2px solid var(--border-color);
    }
    .article-content h3 {
        font-size: 22px;
        font-weight: 600;
        margin: 28px 0 12px;
    }
    .article-content p {
        margin-bottom: 18px;
        color: #374151;
    }
    .article-content ul, .article-content ol {
        margin: 16px 0 20px;
        padding-left: 24px;
    }
    .article-content li {
        margin-bottom: 8px;
        color: #374151;
    }
    .article-content ul li { list-style: disc; }
    .article-content ol li { list-style: decimal; }
    .article-content blockquote {
        border-left: 4px solid var(--primary-from);
        background: #F3EEFF;
        padding: 16px 24px;
        margin: 24px 0;
        border-radius: 0 var(--radius-md) var(--radius-md) 0;
        color: #4B5563;
        font-style: normal;
    }
    .article-content blockquote p { margin: 0; }
    .article-content img {
        margin: 24px auto;
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-card);
        max-width: 100%;
    }
    .article-content a {
        color: var(--primary-from);
        text-decoration: underline;
        text-underline-offset: 2px;
    }
    .article-content a:hover { color: var(--primary-to); }
    .article-content code {
        background: #F3F4F6;
        padding: 2px 8px;
        border-radius: 4px;
        font-size: 0.9em;
        color: #DC2626;
    }
    .article-content pre {
        background: #1F2937;
        color: #F9FAFB;
        padding: 20px 24px;
        border-radius: var(--radius-md);
        overflow-x: auto;
        margin: 24px 0;
        font-size: 14px;
        line-height: 1.6;
    }
    .article-content pre code {
        background: transparent;
        color: inherit;
        padding: 0;
        font-size: inherit;
    }

    /* ===== Sidebar ===== */
    .article-sidebar {
        display: flex;
        flex-direction: column;
        gap: 32px;
    }
    .sidebar-card {
        background: var(--bg-card);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-card);
        padding: 24px;
    }
    .sidebar-card h3 {
        font-size: 18px;
        font-weight: 600;
        margin-bottom: 16px;
        padding-bottom: 12px;
        border-bottom: 2px solid var(--border-color);
        position: relative;
    }
    .sidebar-card h3::after {
        content: '';
        position: absolute;
        bottom: -2px;
        left: 0;
        width: 50px;
        height: 2px;
        background: var(--primary-gradient);
        border-radius: 2px;
    }
    .sidebar-posts {
        display: flex;
        flex-direction: column;
        gap: 14px;
    }
    .sidebar-post {
        display: flex;
        gap: 12px;
        align-items: flex-start;
    }
    .sidebar-post img {
        width: 72px;
        height: 54px;
        border-radius: var(--radius-sm);
        object-fit: cover;
        flex-shrink: 0;
    }
    .sidebar-post-info {
        flex: 1;
        min-width: 0;
    }
    .sidebar-post-info .title {
        font-size: 14px;
        font-weight: 500;
        line-height: 1.4;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
        color: var(--text-dark);
        transition: color 0.2s;
    }
    .sidebar-post-info .title:hover { color: var(--primary-from); }
    .sidebar-post-info .date {
        font-size: 12px;
        color: var(--text-light);
        margin-top: 4px;
    }
    .sidebar-tags {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
    }
    .sidebar-tags a {
        display: inline-block;
        background: var(--bg-body);
        color: var(--text-muted);
        padding: 4px 14px;
        border-radius: var(--radius-pill);
        font-size: 13px;
        border: 1px solid var(--border-color);
        transition: all 0.2s;
    }
    .sidebar-tags a:hover {
        background: var(--primary-gradient);
        color: #fff;
        border-color: transparent;
    }

    /* ===== Related Posts ===== */
    .related-section {
        padding: 0 0 var(--spacer);
    }
    .related-section h2 {
        font-size: 28px;
        font-weight: 600;
        text-align: center;
        margin-bottom: 36px;
        position: relative;
    }
    .related-section h2::after {
        content: '';
        display: block;
        width: 60px;
        height: 3px;
        background: var(--primary-gradient);
        border-radius: 3px;
        margin: 12px auto 0;
    }
    .related-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }
    .related-card {
        background: var(--bg-card);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-card);
        overflow: hidden;
        transition: transform 0.3s, box-shadow 0.3s;
    }
    .related-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--shadow-hover);
    }
    .related-card img {
        width: 100%;
        height: 180px;
        object-fit: cover;
        border-radius: 0;
    }
    .related-card .card-body {
        padding: 20px 20px 24px;
    }
    .related-card .card-body .tag {
        display: inline-block;
        background: var(--accent-light);
        color: #92400E;
        padding: 2px 12px;
        border-radius: var(--radius-pill);
        font-size: 12px;
        font-weight: 500;
        margin-bottom: 8px;
    }
    .related-card .card-body h3 {
        font-size: 17px;
        font-weight: 600;
        line-height: 1.4;
        margin-bottom: 8px;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    .related-card .card-body h3 a { color: var(--text-dark); }
    .related-card .card-body h3 a:hover { color: var(--primary-from); }
    .related-card .card-body p {
        font-size: 14px;
        color: var(--text-muted);
        line-height: 1.5;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }
    .related-card .card-body .date {
        font-size: 13px;
        color: var(--text-light);
        margin-top: 10px;
        display: block;
    }

    /* ===== Not Found ===== */
    .not-found-box {
        text-align: center;
        padding: 80px 24px;
        background: var(--bg-card);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-card);
    }
    .not-found-box .icon {
        font-size: 64px;
        margin-bottom: 20px;
        display: block;
        opacity: 0.6;
    }
    .not-found-box h2 {
        font-size: 26px;
        font-weight: 600;
        margin-bottom: 12px;
    }
    .not-found-box p {
        color: var(--text-muted);
        margin-bottom: 24px;
        font-size: 16px;
    }
    .not-found-box .btn-back {
        display: inline-block;
        padding: 12px 32px;
        background: var(--primary-gradient);
        color: #fff;
        border-radius: var(--radius-md);
        font-weight: 500;
        transition: opacity 0.3s, transform 0.2s;
    }
    .not-found-box .btn-back:hover {
        opacity: 0.9;
        transform: translateY(-2px);
    }

    /* ===== CTA ===== */
    .cta-banner {
        background: var(--primary-gradient);
        border-radius: var(--radius-lg);
        padding: 56px 48px;
        text-align: center;
        color: #fff;
        margin-bottom: var(--spacer);
        position: relative;
        overflow: hidden;
    }
    .cta-banner::before {
        content: '';
        position: absolute;
        inset: 0;
        background: radial-gradient(circle at 20% 50%, rgba(255,255,255,0.12) 0%, transparent 60%);
        pointer-events: none;
    }
    .cta-banner h2 {
        font-size: 30px;
        font-weight: 700;
        color: #fff;
        margin-bottom: 12px;
        position: relative;
    }
    .cta-banner p {
        font-size: 16px;
        opacity: 0.9;
        margin-bottom: 24px;
        position: relative;
    }
    .cta-banner .btn-cta {
        display: inline-block;
        background: var(--accent);
        color: #fff;
        padding: 14px 40px;
        border-radius: var(--radius-md);
        font-size: 18px;
        font-weight: 600;
        transition: background 0.3s, transform 0.2s;
        position: relative;
    }
    .cta-banner .btn-cta:hover {
        background: var(--accent-hover);
        transform: translateY(-2px);
    }

    /* ===== Footer ===== */
    .site-footer {
        background: #1F2937;
        color: #D1D5DB;
        padding: 56px 0 24px;
    }
    .footer-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 40px;
        margin-bottom: 36px;
    }
    .footer-col h4 {
        font-size: 16px;
        font-weight: 600;
        color: #F9FAFB;
        margin-bottom: 16px;
    }
    .footer-col a {
        display: block;
        font-size: 14px;
        color: #9CA3AF;
        margin-bottom: 10px;
        transition: color 0.2s;
    }
    .footer-col a:hover { color: #fff; }
    .footer-bottom {
        border-top: 1px solid #374151;
        padding-top: 20px;
        display: flex;
        justify-content: space-between;
        align-items: center;
        flex-wrap: wrap;
        gap: 12px;
        font-size: 13px;
        color: #6B7280;
    }
    .footer-bottom a { color: #9CA3AF; }
    .footer-bottom a:hover { color: #fff; }

    /* ===== Mobile Nav Overlay ===== */
    .nav-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.4);
        z-index: 1050;
        opacity: 0;
        transition: opacity 0.3s;
    }
    .nav-overlay.show {
        opacity: 1;
    }

    /* ===== Responsive ===== */
    @media (max-width: 1024px) {
        .article-layout {
            grid-template-columns: 1fr;
        }
        .article-sidebar {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }
        .related-grid {
            grid-template-columns: repeat(2, 1fr);
        }
    }

    @media (max-width: 768px) {
        :root { --spacer: var(--spacer-mobile); --nav-height: 64px; }
        .hamburger { display: flex; }
        .nav-list {
            position: fixed;
            top: 0;
            right: -280px;
            width: 280px;
            height: 100vh;
            background: var(--bg-card);
            flex-direction: column;
            padding: 80px 32px 32px;
            gap: 16px;
            box-shadow: -4px 0 20px rgba(0,0,0,0.1);
            transition: right 0.35s ease;
            z-index: 1060;
            overflow-y: auto;
        }
        .nav-list.open { right: 0; }
        .nav-list a { font-size: 17px; padding: 10px 0; }
        .nav-overlay.show { display: block; }

        .article-body { padding: 24px 20px; }
        .article-body h1 { font-size: 24px; }
        .article-meta { gap: 12px; font-size: 13px; }
        .article-content h2 { font-size: 22px; }
        .article-content h3 { font-size: 19px; }

        .article-sidebar { grid-template-columns: 1fr; }
        .related-grid { grid-template-columns: 1fr; }
        .cta-banner { padding: 36px 24px; }
        .cta-banner h2 { font-size: 24px; }

        .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 28px; }
        .footer-bottom { flex-direction: column; text-align: center; }
    }

    @media (max-width: 520px) {
        .container { padding: 0 16px; }
        .article-body { padding: 20px 16px; }
        .article-body h1 { font-size: 20px; }
        .footer-grid { grid-template-columns: 1fr; gap: 24px; }
        .cta-banner h2 { font-size: 20px; }
        .cta-banner .btn-cta { padding: 12px 28px; font-size: 16px; }
    }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary-start: #7B2FBE;
            --primary-end: #3B82F6;
            --primary-gradient: linear-gradient(135deg, #7B2FBE 0%, #3B82F6 100%);
            --accent: #F59E0B;
            --accent-hover: #D97706;
            --accent-light: #FEF3C7;
            --bg-body: #F8F9FC;
            --bg-card: #FFFFFF;
            --text-dark: #1F2937;
            --text-gray: #6B7280;
            --text-light: #9CA3AF;
            --border-color: #E5E7EB;
            --shadow-sm: 0 4px 12px rgba(0,0,0,0.06);
            --shadow-md: 0 8px 24px rgba(0,0,0,0.12);
            --radius-lg: 16px;
            --radius-md: 8px;
            --radius-badge: 20px;
            --font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
            --section-gap: 80px;
            --card-padding: 24px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-dark);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.2s ease;
        }

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

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

        ul,
        ol {
            list-style: none;
        }

        /* ===== Container ===== */
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: #fff;
            border-bottom: 1px solid var(--border-color);
            height: var(--header-height);
            transition: box-shadow 0.3s ease;
        }

        .site-header.scrolled {
            box-shadow: 0 2px 20px rgba(0,0,0,0.08);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .logo-icon {
            width: 36px;
            height: 36px;
            background: var(--primary-gradient);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 18px;
            color: #fff;
        }

        .logo-text {
            font-size: 22px;
            font-weight: 700;
            background: var(--primary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: 0.5px;
        }

        .logo-text .sub {
            font-weight: 400;
            font-size: 16px;
            -webkit-text-fill-color: var(--text-gray);
            color: var(--text-gray);
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 32px;
        }

        .nav-list a {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-gray);
            padding: 8px 0;
            position: relative;
            transition: color 0.2s ease;
        }

        .nav-list a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary-gradient);
            border-radius: 2px;
            transition: width 0.3s ease;
        }

        .nav-list a:hover {
            color: var(--primary-start);
        }

        .nav-list a:hover::after {
            width: 100%;
        }

        .nav-list a.active {
            color: var(--primary-start);
            font-weight: 600;
        }

        .nav-list a.active::after {
            width: 100%;
        }

        /* Hamburger */
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 8px;
            background: none;
            border: none;
        }

        .hamburger span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-dark);
            border-radius: 4px;
            transition: all 0.3s ease;
        }

        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* ===== Hero ===== */
        .page-hero {
            padding: 140px 0 80px;
            background: linear-gradient(135deg, #7B2FBE 0%, #3B82F6 100%);
            position: relative;
            overflow: hidden;
            min-height: 420px;
            display: flex;
            align-items: center;
        }

        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.08) 0%, transparent 50%),
                radial-gradient(circle at 80% 70%, rgba(255,255,255,0.05) 0%, transparent 50%);
            pointer-events: none;
        }

        .page-hero .container {
            position: relative;
            z-index: 2;
            display: flex;
            align-items: center;
            gap: 48px;
        }

        .hero-content {
            flex: 1;
            max-width: 680px;
        }

        .hero-badge {
            display: inline-block;
            background: rgba(255, 255, 255, 0.18);
            backdrop-filter: blur(4px);
            color: #fff;
            font-size: 14px;
            font-weight: 500;
            padding: 6px 18px;
            border-radius: var(--radius-badge);
            margin-bottom: 20px;
            border: 1px solid rgba(255, 255, 255, 0.2);
        }

        .page-hero h1 {
            font-size: 42px;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }

        .page-hero h1 .highlight {
            color: var(--accent);
        }

        .page-hero .hero-sub {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.85);
            line-height: 1.7;
            margin-bottom: 28px;
            max-width: 560px;
        }

        .hero-cta-group {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            background: var(--accent);
            color: #fff;
            font-size: 18px;
            font-weight: 600;
            border: none;
            border-radius: var(--radius-md);
            cursor: pointer;
            transition: background 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
            box-shadow: 0 4px 14px rgba(245, 158, 11, 0.35);
        }

        .btn-primary:hover {
            background: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(245, 158, 11, 0.4);
        }

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

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            background: transparent;
            color: #fff;
            font-size: 18px;
            font-weight: 500;
            border: 2px solid rgba(255, 255, 255, 0.4);
            border-radius: var(--radius-md);
            cursor: pointer;
            transition: background 0.3s ease, border-color 0.3s ease, transform 0.2s ease;
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: rgba(255, 255, 255, 0.7);
            transform: translateY(-2px);
        }

        .hero-image {
            flex: 0 0 360px;
            height: 320px;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, 0.15);
        }

        .hero-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }

        .hero-image:hover img {
            transform: scale(1.03);
        }

        /* ===== Section Common ===== */
        .section {
            padding: var(--section-gap) 0;
        }

        .section-alt {
            background: var(--bg-card);
        }

        .section-title {
            font-size: 32px;
            font-weight: 700;
            color: var(--text-dark);
            text-align: center;
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }

        .section-subtitle {
            font-size: 17px;
            color: var(--text-gray);
            text-align: center;
            max-width: 680px;
            margin: 0 auto 48px;
            line-height: 1.7;
        }

        .section-subtitle.left {
            text-align: left;
            margin-left: 0;
        }

        /* ===== Security Principles ===== */
        .principles-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .principle-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: var(--card-padding);
            box-shadow: var(--shadow-sm);
            border: 1px solid rgba(229, 231, 235, 0.5);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

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

        .principle-icon {
            width: 52px;
            height: 52px;
            background: var(--accent-light);
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 26px;
            margin-bottom: 18px;
            color: #92400E;
        }

        .principle-card h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 10px;
        }

        .principle-card p {
            font-size: 15px;
            color: var(--text-gray);
            line-height: 1.7;
        }

        /* ===== Scenarios ===== */
        .scenarios-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        .scenario-card {
            display: flex;
            gap: 20px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: var(--card-padding);
            box-shadow: var(--shadow-sm);
            border: 1px solid rgba(229, 231, 235, 0.5);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

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

        .scenario-icon {
            flex-shrink: 0;
            width: 56px;
            height: 56px;
            background: var(--primary-gradient);
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 26px;
            color: #fff;
        }

        .scenario-info h4 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 6px;
        }

        .scenario-info p {
            font-size: 14px;
            color: var(--text-gray);
            line-height: 1.6;
        }

        /* ===== Process / Steps ===== */
        .process-steps {
            display: flex;
            flex-direction: column;
            gap: 28px;
            max-width: 800px;
            margin: 0 auto;
        }

        .step-item {
            display: flex;
            gap: 24px;
            align-items: flex-start;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: var(--card-padding);
            box-shadow: var(--shadow-sm);
            border: 1px solid rgba(229, 231, 235, 0.5);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .step-item:hover {
            transform: translateX(6px);
            box-shadow: var(--shadow-md);
        }

        .step-number {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            background: var(--primary-gradient);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            font-weight: 700;
            color: #fff;
        }

        .step-content h4 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 6px;
        }

        .step-content p {
            font-size: 15px;
            color: var(--text-gray);
            line-height: 1.7;
        }

        /* ===== Stats / Data Badges ===== */
        .stats-row {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
            margin-top: 36px;
        }

        .stat-badge {
            background: var(--accent-light);
            color: #92400E;
            padding: 10px 24px;
            border-radius: var(--radius-badge);
            font-size: 15px;
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            border: 1px solid rgba(245, 158, 11, 0.15);
        }

        .stat-badge .num {
            font-weight: 700;
            color: #78350F;
        }

        /* ===== FAQ Accordion ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            border-bottom: 1px solid var(--border-color);
            padding: 0;
        }

        .faq-item:last-child {
            border-bottom: none;
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            padding: 20px 0;
            background: none;
            border: none;
            cursor: pointer;
            font-size: 17px;
            font-weight: 600;
            color: var(--text-dark);
            text-align: left;
            transition: color 0.2s ease;
            gap: 16px;
        }

        .faq-question:hover {
            color: var(--primary-start);
        }

        .faq-question .arrow {
            flex-shrink: 0;
            font-size: 14px;
            color: var(--text-light);
            transition: transform 0.3s ease;
        }

        .faq-item.open .faq-question .arrow {
            transform: rotate(180deg);
            color: var(--primary-start);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0;
        }

        .faq-item.open .faq-answer {
            max-height: 400px;
            padding: 0 0 20px;
        }

        .faq-answer p {
            font-size: 15px;
            color: var(--text-gray);
            line-height: 1.8;
        }

        /* ===== CTA Section ===== */
        .cta-section {
            background: var(--primary-gradient);
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: radial-gradient(circle at 30% 20%, rgba(255,255,255,0.08) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(255,255,255,0.05) 0%, transparent 50%);
            pointer-events: none;
        }

        .cta-section .container {
            position: relative;
            z-index: 2;
        }

        .cta-title {
            font-size: 34px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }

        .cta-sub {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.85);
            max-width: 560px;
            margin: 0 auto 32px;
            line-height: 1.7;
        }

        .cta-buttons {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .cta-buttons .btn-primary {
            background: #fff;
            color: var(--primary-start);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
        }

        .cta-buttons .btn-primary:hover {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 8px 28px rgba(245, 158, 11, 0.4);
        }

        .cta-buttons .btn-secondary {
            border-color: rgba(255, 255, 255, 0.5);
            color: #fff;
        }

        .cta-buttons .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #fff;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #1F2937;
            color: rgba(255, 255, 255, 0.7);
            padding: 60px 0 30px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }

        .footer-col a {
            display: block;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            padding: 5px 0;
            transition: color 0.2s ease;
        }

        .footer-col a:hover {
            color: #fff;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.5);
        }

        .footer-bottom a {
            color: rgba(255, 255, 255, 0.6);
        }

        .footer-bottom a:hover {
            color: #fff;
        }

        /* ===== Mobile Nav ===== */
        .mobile-menu {
            display: none;
            position: fixed;
            top: var(--header-height);
            left: 0;
            width: 100%;
            background: #fff;
            border-bottom: 2px solid var(--border-color);
            padding: 20px 24px;
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
            z-index: 999;
            transform: translateY(-110%);
            transition: transform 0.35s ease;
        }

        .mobile-menu.open {
            transform: translateY(0);
        }

        .mobile-menu .nav-list {
            flex-direction: column;
            gap: 4px;
            align-items: stretch;
        }

        .mobile-menu .nav-list a {
            display: block;
            padding: 14px 16px;
            border-radius: var(--radius-md);
            font-size: 16px;
            font-weight: 500;
            color: var(--text-dark);
        }

        .mobile-menu .nav-list a.active {
            background: var(--accent-light);
            color: var(--primary-start);
            font-weight: 600;
        }

        .mobile-menu .nav-list a::after {
            display: none;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .hero-image {
                flex: 0 0 280px;
                height: 260px;
            }

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

            .page-hero h1 {
                font-size: 36px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --section-gap: 48px;
            }

            .nav-list {
                display: none;
            }

            .hamburger {
                display: flex;
            }

            .mobile-menu {
                display: block;
            }

            .page-hero {
                padding: 120px 0 56px;
                min-height: auto;
            }

            .page-hero .container {
                flex-direction: column;
                gap: 32px;
            }

            .hero-content {
                max-width: 100%;
                text-align: center;
            }

            .page-hero .hero-sub {
                max-width: 100%;
            }

            .hero-cta-group {
                justify-content: center;
            }

            .hero-image {
                flex: 0 0 100%;
                height: 220px;
                max-width: 400px;
                margin: 0 auto;
            }

            .page-hero h1 {
                font-size: 30px;
            }

            .page-hero .hero-sub {
                font-size: 16px;
            }

            .section-title {
                font-size: 26px;
            }

            .section-subtitle {
                font-size: 15px;
                margin-bottom: 32px;
            }

            .principles-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .scenarios-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .scenario-card {
                flex-direction: column;
                align-items: flex-start;
                gap: 14px;
            }

            .step-item {
                flex-direction: column;
                gap: 14px;
                align-items: flex-start;
            }

            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 28px;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }

            .cta-title {
                font-size: 26px;
            }

            .cta-sub {
                font-size: 16px;
            }

            .stats-row {
                gap: 12px;
            }

            .stat-badge {
                font-size: 13px;
                padding: 8px 18px;
            }

            .btn-primary,
            .btn-secondary {
                font-size: 16px;
                padding: 12px 24px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }

            .page-hero h1 {
                font-size: 26px;
            }

            .hero-cta-group {
                flex-direction: column;
                align-items: center;
            }

            .btn-primary,
            .btn-secondary {
                width: 100%;
                justify-content: center;
            }

            .hero-image {
                height: 180px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .principles-grid {
                gap: 16px;
            }

            .principle-card {
                padding: 18px;
            }

            .scenario-card {
                padding: 18px;
            }

            .step-item {
                padding: 18px;
            }

            .faq-question {
                font-size: 15px;
                padding: 16px 0;
            }

            .section-title {
                font-size: 22px;
            }
        }

        /* ===== Smooth reveal ===== */
        .fade-up {
            opacity: 0;
            transform: translateY(24px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }

        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }

/* roulang page: category2 */
/* ===== DESIGN TOKENS ===== */
    :root {
      --primary-violet: #7B2FBE;
      --primary-blue: #3B82F6;
      --primary-gradient: linear-gradient(135deg, #7B2FBE 0%, #3B82F6 100%);
      --primary-gradient-soft: linear-gradient(135deg, rgba(123, 47, 190, 0.08) 0%, rgba(59, 130, 246, 0.08) 100%);
      --accent-gold: #F59E0B;
      --accent-gold-hover: #D97706;
      --accent-gold-light: #FEF3C7;
      --accent-gold-text: #92400E;
      --bg-body: #F8F9FC;
      --bg-card: #FFFFFF;
      --text-dark: #1F2937;
      --text-muted: #6B7280;
      --text-light: #9CA3AF;
      --border-light: #E5E7EB;
      --border-input: #D1D5DB;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.10);
      --shadow-lg: 0 16px 40px rgba(0,0,0,0.12);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-badge: 20px;
      --radius-input: 12px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --max-width: 1200px;
      --header-height: 72px;
    }

    /* ===== RESET & BASE ===== */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
    body {
      font-family: var(--font-sans);
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-dark);
      background: var(--bg-body);
    }
    a { color: inherit; text-decoration: none; transition: color 0.2s; }
    img { max-width: 100%; height: auto; display: block; }
    button { font-family: inherit; cursor: pointer; border: none; background: none; }
    input, textarea { font-family: inherit; }
    ul { list-style: none; }
    h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; }

    /* ===== CONTAINER & GRID ===== */
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* ===== HEADER / NAV ===== */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1000;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      height: var(--header-height);
      display: flex;
      align-items: center;
    }
    .site-header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .header-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
      width: 200px;
    }
    .header-logo .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--primary-gradient);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 18px;
      font-weight: 700;
      flex-shrink: 0;
    }
    .header-logo .logo-text {
      font-size: 20px;
      font-weight: 700;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      white-space: nowrap;
    }
    .nav-list {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-list li a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
      padding: 6px 0;
      position: relative;
      transition: color 0.25s;
    }
    .nav-list li a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      right: 0;
      height: 2px;
      background: var(--primary-gradient);
      border-radius: 2px;
      transform: scaleX(0);
      transition: transform 0.25s;
    }
    .nav-list li a:hover { color: var(--primary-violet); }
    .nav-list li a.active {
      color: var(--primary-violet);
      font-weight: 600;
    }
    .nav-list li a.active::after { transform: scaleX(1); }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      padding: 8px;
      cursor: pointer;
      border-radius: 8px;
      transition: background 0.2s;
    }
    .hamburger:hover { background: var(--primary-gradient-soft); }
    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-dark);
      border-radius: 2px;
      transition: all 0.3s;
    }
    .hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .hamburger.active span:nth-child(2) { opacity: 0; }
    .hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

    /* ===== MOBILE NAV OVERLAY ===== */
    .mobile-nav-overlay {
      position: fixed;
      top: var(--header-height);
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      z-index: 999;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 28px;
      opacity: 0;
      visibility: hidden;
      transition: all 0.35s;
    }
    .mobile-nav-overlay.open { opacity: 1; visibility: visible; }
    .mobile-nav-overlay a {
      font-size: 22px;
      font-weight: 500;
      color: var(--text-dark);
      transition: color 0.2s;
    }
    .mobile-nav-overlay a:hover { color: var(--primary-violet); }
    .mobile-nav-overlay a.active { color: var(--primary-violet); font-weight: 700; }

    /* ===== HERO ===== */
    .hero-section {
      margin-top: var(--header-height);
      min-height: 520px;
      display: flex;
      align-items: center;
      background: var(--primary-gradient-soft);
      background-image: url('/assets/images/backpic/back-2.webp'), linear-gradient(135deg, rgba(123,47,190,0.06) 0%, rgba(59,130,246,0.06) 100%);
      background-size: cover, auto;
      background-position: center;
      background-blend-mode: overlay, normal;
      position: relative;
      overflow: hidden;
    }
    .hero-section::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(248,249,252,0.92) 0%, rgba(248,249,252,0.70) 50%, rgba(248,249,252,0.20) 100%);
      pointer-events: none;
    }
    .hero-section .container {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      padding-top: 48px;
      padding-bottom: 48px;
    }
    .hero-left { max-width: 600px; }
    .hero-left .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: var(--accent-gold-light);
      color: var(--accent-gold-text);
      font-size: 14px;
      font-weight: 600;
      padding: 6px 18px;
      border-radius: var(--radius-badge);
      margin-bottom: 20px;
    }
    .hero-left h1 {
      font-size: 38px;
      font-weight: 700;
      line-height: 1.25;
      margin-bottom: 16px;
    }
    .hero-left h1 .highlight { background: var(--primary-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
    .hero-left .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-right {
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .hero-right .hero-mock {
      width: 100%;
      max-width: 420px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-lg);
      background: #fff;
      padding: 12px;
    }
    .hero-right .hero-mock img {
      border-radius: 12px;
      width: 100%;
      aspect-ratio: 16/10;
      object-fit: cover;
      background: var(--primary-gradient-soft);
    }

    /* ===== BUTTONS ===== */
    .btn {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 16px;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      transition: all 0.25s;
      border: 2px solid transparent;
      cursor: pointer;
      text-align: center;
    }
    .btn-primary {
      background: var(--primary-gradient);
      color: #fff;
      box-shadow: 0 4px 14px rgba(123,47,190,0.30);
    }
    .btn-primary:hover { background: linear-gradient(135deg, #6a28a8 0%, #2563eb 100%); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(123,47,190,0.35); }
    .btn-secondary {
      background: transparent;
      color: var(--primary-violet);
      border-color: var(--primary-violet);
    }
    .btn-secondary:hover { background: var(--primary-gradient-soft); transform: translateY(-2px); }
    .btn-accent {
      background: var(--accent-gold);
      color: #fff;
      box-shadow: 0 4px 14px rgba(245,158,11,0.30);
    }
    .btn-accent:hover { background: var(--accent-gold-hover); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(245,158,11,0.35); }
    .btn-lg { font-size: 20px; padding: 18px 40px; }
    .btn-sm { font-size: 14px; padding: 10px 20px; }

    /* ===== SECTION COMMON ===== */
    .section { padding: 80px 0; }
    .section-alt { background: var(--bg-body); }
    .section-card-bg { background: #fff; }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title h2 {
      font-size: 30px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 12px;
    }
    .section-title p {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 640px;
      margin: 0 auto;
    }

    /* ===== ADVANTAGE CARDS ===== */
    .advantage-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .advantage-card {
      background: #fff;
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
      border: 1px solid rgba(229,231,235,0.40);
      text-align: center;
    }
    .advantage-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
    .advantage-card .icon-box {
      width: 56px;
      height: 56px;
      background: var(--primary-gradient-soft);
      border-radius: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 18px;
      font-size: 24px;
      color: var(--primary-violet);
    }
    .advantage-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 10px; }
    .advantage-card p { font-size: 15px; color: var(--text-muted); line-height: 1.6; }

    /* ===== SCENARIO GRID ===== */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .scenario-card {
      background: #fff;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
      border: 1px solid rgba(229,231,235,0.40);
      display: flex;
      flex-direction: column;
    }
    .scenario-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
    .scenario-card .scenario-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      background: var(--primary-gradient-soft);
    }
    .scenario-card .scenario-body { padding: 20px 24px 24px; flex: 1; }
    .scenario-card .scenario-body h3 { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
    .scenario-card .scenario-body p { font-size: 15px; color: var(--text-muted); line-height: 1.6; }

    /* ===== STEPS ===== */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      counter-reset: step;
    }
    .step-card {
      background: #fff;
      border-radius: var(--radius-card);
      padding: 28px 20px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      position: relative;
      transition: all 0.3s;
      border: 1px solid rgba(229,231,235,0.40);
    }
    .step-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
    .step-card::before {
      counter-increment: step;
      content: counter(step);
      position: absolute;
      top: -10px;
      left: 50%;
      transform: translateX(-50%);
      width: 28px;
      height: 28px;
      background: var(--primary-gradient);
      color: #fff;
      font-size: 14px;
      font-weight: 700;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .step-card .step-icon {
      font-size: 30px;
      color: var(--primary-violet);
      margin-bottom: 14px;
      margin-top: 8px;
    }
    .step-card h3 { font-size: 17px; font-weight: 600; margin-bottom: 8px; }
    .step-card p { font-size: 14px; color: var(--text-muted); line-height: 1.5; }

    /* ===== BADGE ROW ===== */
    .badge-row {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
      margin-top: 20px;
    }
    .badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: var(--accent-gold-light);
      color: var(--accent-gold-text);
      font-size: 14px;
      font-weight: 600;
      padding: 8px 20px;
      border-radius: var(--radius-badge);
      transition: all 0.2s;
    }
    .badge i { font-size: 14px; }
    .badge:hover { background: #fde68a; transform: translateY(-1px); }

    /* ===== FAQ ACCORDION ===== */
    .faq-list { max-width: 800px; margin: 0 auto; }
    .faq-item {
      background: #fff;
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
      border: 1px solid rgba(229,231,235,0.40);
      overflow: hidden;
      transition: box-shadow 0.3s;
    }
    .faq-item:hover { box-shadow: var(--shadow-md); }
    .faq-item .faq-question {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      transition: background 0.2s;
      gap: 16px;
    }
    .faq-item .faq-question:hover { background: var(--primary-gradient-soft); }
    .faq-item .faq-question .faq-arrow {
      flex-shrink: 0;
      font-size: 14px;
      color: var(--text-muted);
      transition: transform 0.3s;
    }
    .faq-item.open .faq-question .faq-arrow { transform: rotate(180deg); }
    .faq-item .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s ease;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 15px;
      line-height: 1.7;
    }
    .faq-item.open .faq-answer {
      max-height: 400px;
      padding: 0 24px 20px;
    }

    /* ===== CTA ===== */
    .cta-section {
      background: var(--primary-gradient);
      color: #fff;
      text-align: center;
      padding: 72px 0;
    }
    .cta-section h2 { font-size: 30px; font-weight: 700; margin-bottom: 12px; color: #fff; }
    .cta-section p { font-size: 17px; opacity: 0.90; margin-bottom: 28px; max-width: 560px; margin-left: auto; margin-right: auto; }
    .cta-section .btn-primary { background: #fff; color: var(--primary-violet); box-shadow: 0 4px 20px rgba(0,0,0,0.15); }
    .cta-section .btn-primary:hover { background: var(--accent-gold); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 28px rgba(0,0,0,0.20); }

    /* ===== FOOTER ===== */
    .site-footer {
      background: #1F2937;
      color: rgba(255,255,255,0.85);
      padding: 56px 0 28px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      margin-bottom: 32px;
    }
    .footer-col h4 {
      font-size: 16px;
      font-weight: 600;
      color: #fff;
      margin-bottom: 16px;
    }
    .footer-col a {
      display: block;
      font-size: 14px;
      color: rgba(255,255,255,0.65);
      padding: 4px 0;
      transition: color 0.2s;
    }
    .footer-col a:hover { color: #fff; }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.10);
      padding-top: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 13px;
      color: rgba(255,255,255,0.50);
    }
    .footer-bottom a { color: rgba(255,255,255,0.65); }
    .footer-bottom a:hover { color: #fff; }

    /* ===== RESPONSIVE ===== */
    @media (max-width: 1024px) {
      .hero-left h1 { font-size: 32px; }
      .steps-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-list { display: none; }
      .hamburger { display: flex; }
      .hero-section .container { grid-template-columns: 1fr; gap: 32px; text-align: center; }
      .hero-left .hero-actions { justify-content: center; }
      .hero-left h1 { font-size: 28px; }
      .hero-left .hero-sub { font-size: 16px; }
      .hero-right .hero-mock { max-width: 320px; margin: 0 auto; }
      .advantage-grid { grid-template-columns: 1fr; }
      .scenario-grid { grid-template-columns: 1fr; }
      .steps-grid { grid-template-columns: 1fr 1fr; }
      .section { padding: 48px 0; }
      .section-title h2 { font-size: 24px; }
      .cta-section h2 { font-size: 24px; }
      .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
      .footer-bottom { flex-direction: column; text-align: center; }
    }
    @media (max-width: 520px) {
      .container { padding: 0 16px; }
      .hero-left h1 { font-size: 24px; }
      .hero-actions { flex-direction: column; align-items: center; }
      .btn-lg { font-size: 18px; padding: 14px 32px; width: 100%; max-width: 300px; }
      .steps-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .badge-row { flex-direction: column; align-items: center; }
    }

    /* ===== UTILITY ===== */
    .text-center { text-align: center; }
    .mt-20 { margin-top: 20px; }
    .mb-20 { margin-bottom: 20px; }
    .gap-16 { gap: 16px; }
    .flex-center { display: flex; align-items: center; justify-content: center; }

    /* ===== SECURITY NOTE BLOCK ===== */
    .security-note {
      background: var(--primary-gradient-soft);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      margin-top: 32px;
      display: flex;
      align-items: flex-start;
      gap: 20px;
      flex-wrap: wrap;
    }
    .security-note .sec-icon { font-size: 28px; color: var(--primary-violet); flex-shrink: 0; }
    .security-note .sec-text { flex: 1; min-width: 200px; }
    .security-note .sec-text h4 { font-size: 17px; font-weight: 600; margin-bottom: 4px; }
    .security-note .sec-text p { font-size: 15px; color: var(--text-muted); }