/* roulang page: index */
:root {
  --primary: #00B98A;
  --primary-dark: #007E7A;
  --primary-light: #E8F6EF;
  --accent: #FF7A1A;
  --bg: #F5F6F2;
  --dark: #0C1D1C;
  --text: #16211F;
  --text-weak: #5C6B68;
  --border: #E2E8E4;
  --shadow-card: 0 2px 12px rgba(12,29,28,.06);
  --shadow-hover: 0 10px 32px rgba(12,29,28,.12);
  --shadow-badge: 0 6px 16px rgba(0,185,138,.18);
  --radius-card: 20px;
  --radius-lg: 24px;
  --radius-btn: 10px;
  --radius-pill: 999px;
  --sidebar-w: 264px;
  --font-cn: "PingFang SC", "HarmonicOS Sans SC", "Microsoft YaHei", sans-serif;
  --font-num: "Inter", "Roboto", "DIN", sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-cn);
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  margin: 0;
  padding: 0;
}
a { color: var(--primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent); }
img { max-width: 100%; height: auto; }
button:focus, a:focus, .accordion-button:focus { outline: 3px solid rgba(0,185,138,.25); outline-offset: 2px; }
::selection { background: rgba(0,185,138,.18); }
.container-custom { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.section-padding { padding: 80px 0; }
@media (max-width: 768px) { .section-padding { padding: 56px 0; } }

/* ===== Buttons ===== */
.btn-brand {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 13px 28px; border-radius: var(--radius-btn);
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff; font-weight: 600; font-size: 15px; border: none;
  transition: all .25s ease; text-decoration: none; letter-spacing: .01em;
}
.btn-brand:hover { background: linear-gradient(135deg, var(--primary-dark), #006b68); color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.btn-brand:active { transform: translateY(0) scale(.97); }
.btn-outline-light {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 26px; border-radius: var(--radius-btn);
  background: transparent; color: #fff; font-weight: 600; font-size: 15px;
  border: 1.5px solid rgba(255,255,255,.6); transition: all .25s ease; text-decoration: none;
}
.btn-outline-light:hover { background: rgba(255,255,255,.12); color: #fff; transform: translateY(-2px); border-color: #fff; }
.btn-cta {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 15px 36px; border-radius: var(--radius-btn);
  background: var(--accent); color: #fff; font-weight: 700; font-size: 16px; border: none;
  transition: all .25s ease; text-decoration: none; box-shadow: 0 6px 20px rgba(255,122,26,.3);
}
.btn-cta:hover { background: #ff8a35; color: #fff; transform: translateY(-2px); box-shadow: 0 10px 28px rgba(255,122,26,.4); }
.btn-cta:active { transform: scale(.97); }

/* ===== Site Shell Layout ===== */
.site-shell { display: flex; min-height: 100vh; }
.main-wrap { margin-left: var(--sidebar-w); width: calc(100% - var(--sidebar-w)); min-height: 100vh; display: flex; flex-direction: column; }

/* ===== Sidebar ===== */
.site-sidebar {
  width: var(--sidebar-w); background: var(--dark); position: fixed;
  top: 0; left: 0; bottom: 0; z-index: 1040;
  display: flex; flex-direction: column;
  border-right: 4px solid var(--primary);
  transition: width .3s ease, transform .3s ease;
}
.sidebar-inner { display: flex; flex-direction: column; height: 100%; padding: 28px 18px; overflow-y: auto; }
.brand { display: flex; align-items: center; gap: 12px; padding: 0 10px 24px; border-bottom: 1px solid rgba(255,255,255,.1); margin-bottom: 24px; text-decoration: none; }
.brand-text { color: #fff; font-size: 21px; font-weight: 800; letter-spacing: .02em; white-space: nowrap; line-height: 1.3; }
.brand:hover .brand-text { color: var(--primary); }
.sidebar-nav { display: flex; flex-direction: column; gap: 6px; flex: 1; }
.nav-item {
  display: flex; align-items: center; gap: 14px; padding: 14px 16px;
  border-radius: 12px; color: rgba(255,255,255,.6); font-size: 15px; font-weight: 500;
  text-decoration: none; transition: all .2s ease; position: relative; white-space: nowrap;
}
.nav-item:hover { background: rgba(255,255,255,.06); color: #fff; transform: translateX(4px); }
.nav-item.active { background: rgba(255,255,255,.08); color: #fff; font-weight: 600; }
.nav-item.active::before {
  content: ''; position: absolute; left: 0; top: 20%; bottom: 20%;
  width: 4px; border-radius: 4px; background: var(--primary);
}
.nav-icon { flex-shrink: 0; width: 20px; height: 20px; }
.sidebar-bottom { margin-top: auto; padding-top: 24px; }
.online-card {
  display: flex; align-items: center; gap: 12px; padding: 14px 14px;
  background: rgba(255,255,255,.06); border-radius: 16px; text-decoration: none;
  border: 1px solid rgba(255,255,255,.08); transition: all .25s ease;
}
.online-card:hover { background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.16); transform: translateY(-2px); }
.online-icon { font-size: 22px; }
.online-content { display: flex; flex-direction: column; }
.online-title { color: #fff; font-size: 14px; font-weight: 600; }
.online-sub { color: rgba(255,255,255,.5); font-size: 12px; }

/* ===== Mobile Header ===== */
.mobile-header {
  display: none; height: 64px; background: var(--dark); position: sticky; top: 0;
  z-index: 1030; align-items: center; justify-content: space-between;
  padding: 0 16px; border-bottom: 3px solid var(--primary);
}
.mobile-brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.mobile-brand span { color: #fff; font-size: 18px; font-weight: 800; }
.hamburger {
  width: 44px; height: 44px; background: transparent; border: none; cursor: pointer;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px;
}
.hamburger span { display: block; width: 24px; height: 2.5px; background: #fff; border-radius: 3px; transition: all .3s ease; }
.hamburger.active span:nth-child(1) { transform: translateY(4.5px) rotate(45deg); }
.hamburger.active span:nth-child(2) { transform: translateY(-4.5px) rotate(-45deg); }

/* ===== Mobile Drawer ===== */
.mobile-drawer {
  position: fixed; inset: 0; background: linear-gradient(160deg, var(--dark) 0%, #123231 60%);
  z-index: 1050; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 20px; opacity: 0; visibility: hidden; transition: all .35s ease; padding: 40px;
}
.mobile-drawer.open { opacity: 1; visibility: visible; }
.mobile-drawer .drawer-link {
  color: #fff; font-size: 28px; font-weight: 700; text-decoration: none; padding: 12px 20px;
  border-radius: 12px; transition: all .2s; opacity: .7;
}
.mobile-drawer .drawer-link:hover, .mobile-drawer .drawer-link.active { opacity: 1; color: var(--primary); }
.drawer-footer { position: absolute; bottom: 40px; text-align: center; color: rgba(255,255,255,.4); font-size: 13px; }
.drawer-footer p { margin: 4px 0; }
.drawer-close {
  position: absolute; top: 20px; right: 20px; background: transparent; border: none;
  color: #fff; font-size: 28px; cursor: pointer; width: 44px; height: 44px;
}

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, var(--dark) 0%, var(--primary-dark) 100%);
  position: relative; overflow: hidden; min-height: 560px; display: flex; align-items: center;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
  background-size: 30px 30px;
}
.hero::after {
  content: ''; position: absolute; inset: 0;
  background: url('/assets/images/backpic/back-1.png') center/cover no-repeat; opacity: .18;
}
.hero-inner {
  position: relative; z-index: 2; display: flex; align-items: center; gap: 48px;
  width: 100%; max-width: 1280px; margin: 0 auto; padding: 80px 24px; min-height: 560px;
}
.hero-copy { flex: 1.1; }
.hero-title { color: #fff; font-size: 44px; font-weight: 800; line-height: 1.25; letter-spacing: -0.02em; margin-bottom: 18px; }
.hero-title span { color: var(--primary); }
.hero-subtitle { color: rgba(255,255,255,.78); font-size: 17px; line-height: 1.8; margin-bottom: 32px; max-width: 520px; }
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-visual { flex: 0.9; }
.hero-dashboard {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius-lg); padding: 24px; backdrop-filter: blur(4px);
  box-shadow: 0 20px 50px rgba(0,0,0,.25);
}
.dash-card {
  background: rgba(255,255,255,.14); border-radius: 16px; padding: 20px 16px; text-align: center;
  transition: all .25s ease;
}
.dash-card:hover { background: rgba(255,255,255,.22); transform: translateY(-4px); }
.dash-num { font-family: var(--font-num); font-size: 32px; font-weight: 800; color: #fff; line-height: 1.2; display: block; }
.dash-label { font-size: 13px; color: rgba(255,255,255,.75); margin-top: 4px; display: block; }
.dash-trend { color: var(--accent); font-size: 12px; font-weight: 700; margin-left: 4px; }

/* ===== Section Header ===== */
.section-header { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 40px; gap: 24px; flex-wrap: wrap; }
.section-title { font-size: 34px; font-weight: 700; letter-spacing: -0.01em; margin: 0 0 8px; line-height: 1.3; }
.section-sub { color: var(--text-weak); font-size: 15px; max-width: 480px; margin: 0; }
.more-link { color: var(--primary); font-size: 15px; font-weight: 600; text-decoration: none; padding: 8px 16px; border: 1px solid var(--border); border-radius: var(--radius-pill); transition: all .2s; }
.more-link:hover { color: var(--accent); border-color: var(--accent); background: rgba(255,122,26,.05); }
@media (max-width: 768px) { .section-title { font-size: 27px; } }

/* ===== Pain Points ===== */
.pain-section { background: #fff; }
.pain-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
.pain-list { display: flex; flex-direction: column; gap: 20px; }
.pain-item { display: flex; gap: 16px; align-items: flex-start; }
.pain-num {
  width: 40px; height: 40px; border-radius: 10px; background: rgba(255,122,26,.12);
  color: var(--accent); font-weight: 800; font-size: 15px; display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.pain-item-title { font-size: 17px; font-weight: 700; margin: 0 0 4px; }
.pain-item-text { color: var(--text-weak); font-size: 14px; line-height: 1.7; margin: 0; }
.pain-visual img { border-radius: var(--radius-lg); box-shadow: var(--shadow-hover); width: 100%; height: 100%; object-fit: cover; }
@media (max-width: 992px) { .pain-grid { grid-template-columns: 1fr; } }

/* ===== Solutions ===== */
.solution-section { background: var(--bg); }
.solution-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.solution-card {
  background: var(--primary-light); border-radius: var(--radius-lg); padding: 36px 28px;
  border: 1px solid rgba(0,185,138,.14); transition: all .3s ease; position: relative; overflow: hidden;
}
.solution-card::after {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent)); opacity: 0; transition: opacity .3s;
}
.solution-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.solution-card:hover::after { opacity: 1; }
.sol-icon { width: 56px; height: 56px; border-radius: 14px; background: #fff; display: flex; align-items: center; justify-content: center; margin-bottom: 20px; box-shadow: var(--shadow-card); }
.sol-icon svg { width: 28px; height: 28px; stroke: var(--primary); fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.sol-title { font-size: 19px; font-weight: 700; margin-bottom: 10px; }
.sol-desc { color: var(--text-weak); font-size: 14px; line-height: 1.75; margin: 0; }
@media (max-width: 992px) { .solution-cards { grid-template-columns: 1fr; gap: 16px; } }

/* ===== Results ===== */
.results { background: var(--dark); position: relative; overflow: hidden; }
.results::before {
  content: ''; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.03) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.03) 1px, transparent 1px);
  background-size: 32px 32px;
}
.results .section-title { color: #fff; position: relative; }
.results .more-link { color: var(--primary); border-color: rgba(255,255,255,.2); }
.result-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; position: relative; }
.result-item { text-align: center; padding: 20px; position: relative; }
.result-item:not(:last-child)::after {
  content: ''; position: absolute; right: 0; top: 20%; bottom: 20%;
  border-left: 1px dashed rgba(255,255,255,.18);
}
.result-num { font-family: var(--font-num); font-size: 38px; font-weight: 800; color: var(--primary); display: block; line-height: 1.2; }
.result-label { color: rgba(255,255,255,.6); font-size: 13px; margin-top: 6px; display: block; }
.result-link-wrap { text-align: right; margin-top: 32px; position: relative; }
.result-link { color: var(--primary); font-size: 14px; font-weight: 600; text-decoration: none; }
.result-link:hover { color: var(--accent); }
@media (max-width: 768px) { .result-grid { grid-template-columns: 1fr 1fr; gap: 24px; } .result-item:not(:last-child)::after { display: none; } }

/* ===== News Cards ===== */
.news-section { background: #fff; }
.news-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-card);
  box-shadow: var(--shadow-card); transition: all .3s ease; height: 100%;
  overflow: hidden; display: flex;
}
.news-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.news-card-link { display: flex; flex-direction: column; width: 100%; padding: 24px; color: var(--text); text-decoration: none; }
.news-card-link:hover { color: var(--text); }
.news-badge {
  display: inline-block; background: var(--primary-light); color: var(--primary-dark);
  font-size: 12px; font-weight: 600; padding: 4px 12px; border-radius: var(--radius-pill);
  margin-bottom: 14px; align-self: flex-start; transition: all .2s;
}
.news-card:hover .news-badge { background: rgba(0,185,138,.15); }
.news-card h3 { font-size: 18px; font-weight: 700; line-height: 1.45; margin: 0 0 10px; color: var(--text); transition: color .2s; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-card-link:hover h3 { color: var(--primary); }
.news-summary { color: var(--text-weak); font-size: 14px; line-height: 1.7; margin: 0; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; flex: 1; }
.news-footer { display: flex; align-items: center; justify-content: space-between; margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--border); }
.news-date { color: var(--text-weak); font-size: 13px; }
.news-arrow {
  width: 32px; height: 32px; border-radius: 50%; background: var(--primary-light);
  color: var(--primary); display: flex; align-items: center; justify-content: center;
  font-size: 15px; transition: all .2s; flex-shrink: 0;
}
.news-card:hover .news-arrow { background: var(--primary); color: #fff; }
.empty-state {
  text-align: center; padding: 80px 20px; color: var(--text-weak);
  background: var(--bg); border-radius: var(--radius-card); border: 1px dashed var(--border);
}
.empty-state .empty-icon { font-size: 42px; margin-bottom: 16px; display: block; }

/* ===== Testimonials ===== */
.testimonial-section { background: var(--bg); }
.testimonial-card {
  background: #fff; border-radius: var(--radius-card); padding: 32px 28px;
  border: 1px solid var(--border); box-shadow: var(--shadow-card);
  transition: all .3s ease; height: 100%; position: relative;
}
.testimonial-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.testi-quote { font-family: Georgia, serif; font-size: 48px; color: var(--primary); line-height: .6; margin-bottom: 18px; }
.testi-text { color: var(--text); font-size: 15px; line-height: 1.75; margin-bottom: 24px; }
.testi-user { display: flex; align-items: center; gap: 12px; }
.testi-avatar {
  width: 48px; height: 48px; border-radius: 50%; background: var(--primary-light);
  display: flex; align-items: center; justify-content: center; font-size: 18px; font-weight: 800; color: var(--primary-dark);
}
.testi-name { font-size: 15px; font-weight: 700; color: var(--text); }
.testi-role { font-size: 12px; color: var(--text-weak); }

/* ===== FAQ ===== */
.faq-section { background: #fff; }
.faq-accordion .accordion-item {
  border: 1px solid var(--border); border-radius: 16px !important; overflow: hidden;
  margin-bottom: 16px; box-shadow: none;
}
.faq-accordion .accordion-button {
  background: #fff; color: var(--text); font-size: 16px; font-weight: 600;
  padding: 22px 24px; box-shadow: none; font-family: var(--font-cn);
}
.faq-accordion .accordion-button:hover { color: var(--primary); }
.faq-accordion .accordion-button:not(.collapsed) { background: var(--primary-light); color: var(--text); }
.faq-accordion .accordion-button:focus { box-shadow: 0 0 0 4px rgba(0,185,138,.12); border-color: var(--primary); }
.faq-accordion .accordion-button::after {
  width: 20px; height: 20px; background-size: 20px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 20 20' fill='none'%3E%3Cpath d='M5 7.5L10 12.5L15 7.5' stroke='%2300B98A' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  transition: transform .3s ease;
}
.faq-accordion .accordion-button:not(.collapsed)::after { transform: rotate(180deg); }
.faq-accordion .accordion-body { padding: 0 24px 22px; color: var(--text-weak); font-size: 15px; line-height: 1.85; background: var(--primary-light); border-top: 1px solid rgba(0,185,138,.1); }

/* ===== CTA ===== */
.cta-section { background: var(--bg); }
.cta-box {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--dark) 80%);
  border-radius: var(--radius-lg); padding: 60px 48px; text-align: center;
  position: relative; overflow: hidden; box-shadow: 0 20px 50px rgba(0,0,0,.2);
}
.cta-box::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}
.cta-box::after {
  content: ''; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.03) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.03) 1px, transparent 1px);
  background-size: 24px 24px;
}
.cta-title { color: #fff; font-size: 32px; font-weight: 800; margin-bottom: 12px; position: relative; z-index: 1; }
.cta-text { color: rgba(255,255,255,.75); font-size: 16px; margin-bottom: 32px; position: relative; z-index: 1; max-width: 560px; margin-left: auto; margin-right: auto; }
.cta-actions { position: relative; z-index: 1; display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
@media (max-width: 768px) { .cta-box { padding: 40px 24px; } .cta-title { font-size: 25px; } }

/* ===== Footer ===== */
.site-footer { background: var(--dark); border-top: 4px solid var(--primary); padding: 60px 0 32px; color: rgba(255,255,255,.7); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.footer-brand span { font-size: 19px; font-weight: 800; color: #fff; }
.footer-desc { font-size: 14px; line-height: 1.8; color: rgba(255,255,255,.55); max-width: 340px; }
.footer-title { color: #fff; font-size: 15px; font-weight: 700; margin-bottom: 18px; }
.footer-links { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.footer-links a { color: rgba(255,255,255,.6); font-size: 14px; text-decoration: none; transition: all .2s; }
.footer-links a:hover { color: var(--primary); padding-left: 4px; }
.footer-contact p { font-size: 14px; margin-bottom: 10px; display: flex; align-items: center; gap: 10px; color: rgba(255,255,255,.6); }
.footer-contact .contact-icon { width: 18px; text-align: center; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08); padding-top: 24px;
  color: rgba(255,255,255,.35); font-size: 13px; text-align: center;
}
@media (max-width: 992px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; } }
@media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr; gap: 32px; } }

/* ===== Responsive ===== */
@media (min-width: 992px) and (max-width: 1199px) {
  :root { --sidebar-w: 88px; }
  .brand-text, .nav-item:not(.active) span, .online-content { display: none; }
  .nav-item { justify-content: center; padding: 14px 12px; }
  .nav-item.active span { font-size: 12px; position: absolute; bottom: 4px; left: 0; right: 0; text-align: center; padding: 0 2px; line-height: 1.2; }
  .brand { justify-content: center; padding: 0 0 24px; }
  .online-card { justify-content: center; padding: 12px; }
}
@media (max-width: 991px) {
  .site-sidebar { display: none; transform: translateX(-100%); }
  .main-wrap { margin-left: 0; width: 100%; }
  .mobile-header { display: flex; }
  .page-content { padding-top: 0; }
}
@media (max-width: 768px) {
  .hero-inner { flex-direction: column; padding: 56px 16px; min-height: auto; }
  .hero-title { font-size: 30px; }
  .hero-subtitle { font-size: 15px; }
  .hero-visual { width: 100%; }
  .hero-dashboard { grid-template-columns: 1fr 1fr; padding: 16px; gap: 12px; }
  .dash-num { font-size: 26px; }
  .dash-label { font-size: 12px; }
  .hero-cta .btn-brand, .hero-cta .btn-outline-light { width: 100%; }
  .container-custom { padding: 0 16px; }
  .solution-cards { grid-template-columns: 1fr; }
  .result-grid { grid-template-columns: 1fr 1fr; }
  .cta-title { font-size: 24px; }
  .cta-actions .btn-cta { width: 100%; }
}
@media (max-width: 520px) {
  .hero-dashboard { grid-template-columns: 1fr 1fr; gap: 10px; }
  .dash-card { padding: 14px 8px; }
  .dash-num { font-size: 22px; }
  .section-header { flex-direction: column; align-items: flex-start; }
  .more-link { align-self: flex-start; }
}

/* roulang page: category1 */
:root {
  --primary: #00B98A;
  --primary-dark: #007E7A;
  --accent: #FF7A1A;
  --bg: #F5F6F2;
  --dark: #0C1D1C;
  --primary-light: #E8F6EF;
  --text: #16211F;
  --text-secondary: #5C6B68;
  --border: #E2E8E4;
  --radius: 20px;
  --radius-lg: 24px;
  --shadow: 0 2px 12px rgba(12,29,28,.06);
  --shadow-lg: 0 10px 32px rgba(12,29,28,.12);
  --font-cn: "PingFang SC", "HarmonicOS Sans SC", "Microsoft YaHei", sans-serif;
  --font-num: "Inter", "Roboto", "DIN", sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--primary); }
button { font-family: inherit; }
.container-custom {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}
.top-strip {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  z-index: 2000;
}
.app-shell { min-height: 100vh; }
.sidebar {
  position: fixed;
  top: 0; left: 0;
  width: 264px;
  height: 100vh;
  background: var(--dark);
  padding: 28px 20px 24px;
  display: flex;
  flex-direction: column;
  z-index: 1040;
}
.sidebar::after {
  content: '';
  position: absolute;
  right: 0; top: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--primary), var(--primary-dark));
}
.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 10px 24px;
  border-bottom: 1px solid rgba(255,255,255,.08);
  margin-bottom: 20px;
}
.sidebar-brand svg { flex-shrink: 0; }
.sidebar-brand-text {
  color: #fff;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: .02em;
  white-space: nowrap;
}
.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 14px;
  border-radius: 14px;
  color: rgba(255,255,255,.6);
  font-size: 15px;
  font-weight: 500;
  transition: background .16s ease, color .16s ease, transform .16s ease;
}
.nav-item .nav-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}
.nav-item:hover {
  background: rgba(255,255,255,.06);
  color: #fff;
  transform: translateX(3px);
}
.nav-item.active {
  background: linear-gradient(135deg, rgba(0,185,138,.22), rgba(0,126,122,.18));
  color: #fff;
  box-shadow: inset 4px 0 0 var(--primary);
  font-weight: 600;
}
.sidebar-cta {
  margin-top: auto;
  background: rgba(255,255,255,.05);
  border-radius: 16px;
  padding: 6px;
  border: 1px solid rgba(255,255,255,.07);
}
.sidebar-cta-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border-radius: 12px;
  color: rgba(255,255,255,.85);
  transition: background .2s ease;
}
.sidebar-cta-link:hover {
  background: rgba(255,255,255,.07);
  color: #fff;
}
.sidebar-cta-link svg { flex-shrink: 0; }
.sidebar-cta-link strong {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
}
.sidebar-cta-link span {
  font-size: 12px;
  color: rgba(255,255,255,.5);
}
.main-area {
  margin-left: 264px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
}
.page-content { flex: 1; }
.mobile-header {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 64px;
  background: var(--dark);
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  z-index: 1060;
  border-bottom: 1px solid rgba(255,255,255,.06);
}
.mobile-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-size: 18px;
  font-weight: 800;
}
.mobile-brand:hover { color: #fff; }
.menu-toggle {
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 7px;
  cursor: pointer;
}
.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform .25s ease;
}
.menu-toggle.active span:nth-child(1) { transform: translateY(4.5px) rotate(45deg); }
.menu-toggle.active span:nth-child(2) { transform: translateY(-4.5px) rotate(-45deg); }
.mobile-menu {
  position: fixed;
  inset: 0;
  background: linear-gradient(145deg, var(--primary-dark), var(--dark) 70%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1090;
  opacity: 0;
  visibility: hidden;
  transition: opacity .3s ease, visibility .3s ease;
}
.mobile-menu.open {
  opacity: 1;
  visibility: visible;
}
.menu-close {
  position: absolute;
  top: 18px; right: 20px;
  width: 44px;
  height: 44px;
  background: rgba(255,255,255,.08);
  border: none;
  border-radius: 50%;
  color: #fff;
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
  transition: background .2s ease;
}
.menu-close:hover { background: rgba(255,255,255,.16); }
.mobile-nav {
  display: flex;
  flex-direction: column;
  gap: 28px;
  text-align: center;
  margin-bottom: 60px;
}
.mobile-nav-item {
  color: rgba(255,255,255,.72);
  font-size: 28px;
  font-weight: 700;
  padding: 8px 20px;
}
.mobile-nav-item.active { color: #fff; box-shadow: inset 0 -3px 0 var(--primary); }
.mobile-nav-item:hover { color: var(--primary); }
.mobile-menu-footer {
  text-align: center;
  color: rgba(255,255,255,.5);
  font-size: 13px;
}
.mobile-menu-footer a {
  color: rgba(255,255,255,.8);
  font-size: 14px;
}
.mobile-menu-footer p { margin: 12px 0 0; }

.hero {
  position: relative;
  padding: 88px 0 84px;
  background:
    linear-gradient(135deg, rgba(0,185,138,.32), rgba(0,126,122,.6)),
    url('/assets/images/backpic/back-1.png') center/cover no-repeat,
    linear-gradient(135deg, var(--primary), var(--primary-dark));
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}
.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 56px;
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,.16);
  color: #fff;
  border: 1px solid rgba(255,255,255,.24);
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .02em;
  margin-bottom: 22px;
}
.hero h1 {
  color: #fff;
  font-size: 46px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
}
.hero-sub {
  color: rgba(255,255,255,.85);
  font-size: 17px;
  line-height: 1.8;
  margin: 0 0 34px;
  max-width: 480px;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.hero-board {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.board-card {
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.2);
  backdrop-filter: blur(6px);
  border-radius: var(--radius);
  padding: 24px 22px;
  box-shadow: 0 8px 24px rgba(0,0,0,.08);
  transition: transform .25s ease, background .25s ease;
}
.board-card:hover { transform: translateY(-4px); background: rgba(255,255,255,.2); }
.board-num {
  font-family: var(--font-num);
  font-size: 38px;
  font-weight: 800;
  color: #fff;
  line-height: 1.1;
  margin-bottom: 8px;
}
.board-num small {
  font-size: 18px;
  font-weight: 700;
  color: var(--accent);
  margin-left: 2px;
}
.board-label {
  font-size: 13px;
  color: rgba(255,255,255,.72);
  line-height: 1.4;
}

.section { padding: 80px 0; }
.section-head {
  max-width: 640px;
  margin-bottom: 44px;
}
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-tag {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 700;
  border-radius: 999px;
  padding: 5px 14px;
  margin-bottom: 14px;
}
.section-tag.light {
  background: rgba(255,255,255,.1);
  color: var(--primary);
}
.section-head h2 {
  font-size: 32px;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
}
.section-head p {
  font-size: 16px;
  color: var(--text-secondary);
  margin: 0;
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform .25s ease, box-shadow .25s ease;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.feature-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  box-shadow: var(--shadow);
  transition: transform .25s ease, box-shadow .25s ease;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.feature-icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, var(--primary-light), #D3F0E4);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--primary-dark);
}
.feature-icon svg { width: 26px; height: 26px; }
.feature-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 10px;
}
.feature-card p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.75;
  margin: 0;
}

.topics-section { background: #fff; }
.topic-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform .25s ease, box-shadow .25s ease;
  display: flex;
  flex-direction: column;
}
.topic-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.topic-thumb {
  position: relative;
  height: 190px;
  overflow: hidden;
  background: var(--primary-light);
}
.topic-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .4s ease;
}
.topic-card:hover .topic-thumb img { transform: scale(1.04); }
.topic-tag {
  position: absolute;
  top: 14px; left: 14px;
  background: rgba(12,29,28,.72);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  border-radius: 999px;
  padding: 5px 14px;
}
.topic-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.topic-body h3 {
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 10px;
}
.topic-body p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.75;
  margin: 0 0 18px;
  flex: 1;
}
.topic-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 15px;
  font-weight: 600;
  color: var(--primary-dark);
}
.topic-link:hover { color: var(--accent); }
.topic-link span { transition: transform .2s ease; }
.topic-link:hover span { transform: translateX(4px); }

.stats-section {
  background: var(--dark);
  background-image:
    linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
  background-size: 52px 52px;
  padding: 72px 0;
}
.stats-inner {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 56px;
  align-items: center;
}
.stats-copy h2 {
  color: #fff;
  font-size: 30px;
  font-weight: 800;
  line-height: 1.25;
  margin: 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.stat-item {
  padding: 20px 8px;
  border-right: 1px dashed rgba(255,255,255,.2);
}
.stat-item:nth-child(2n) { border-right: none; }
.stat-item:nth-child(n+3) { border-top: 1px dashed rgba(255,255,255,.12); }
.stat-num {
  font-family: var(--font-num);
  font-size: 42px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.1;
  margin-bottom: 6px;
}
.stat-num small {
  font-size: 20px;
  color: var(--accent);
  font-weight: 700;
}
.stat-label {
  font-size: 14px;
  color: rgba(255,255,255,.6);
}

.steps-section { background: var(--bg); }
.step-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow);
  position: relative;
  transition: transform .25s ease, box-shadow .25s ease;
}
.step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.step-num {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, var(--accent), #F25C05);
  color: #fff;
  font-family: var(--font-num);
  font-weight: 800;
  font-size: 16px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  box-shadow: 0 6px 16px rgba(255,122,26,.25);
}
.step-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 10px;
}
.step-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.75;
  margin: 0;
}

.faq-section { background: #fff; }
.faq-layout {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 52px;
  align-items: start;
}
.faq-intro h2 { font-size: 30px; font-weight: 800; margin: 0 0 14px; }
.faq-intro p { font-size: 15px; color: var(--text-secondary); margin: 0; }
.faq-accordion {
  border: 1px solid var(--border);
  border-radius: 16px;
  background: #fff;
  overflow: hidden;
  padding: 8px 0;
}
.accordion-item {
  border: none;
  border-bottom: 1px solid #EDF1EE;
  background: transparent;
}
.accordion-item:last-child { border-bottom: none; }
.accordion-button {
  background: #fff;
  color: var(--text);
  font-size: 16px;
  font-weight: 600;
  padding: 20px 24px;
  box-shadow: none;
  border: none;
}
.accordion-button:not(.collapsed) {
  background: var(--primary-light);
  color: var(--text);
  box-shadow: none;
}
.accordion-button:focus {
  box-shadow: 0 0 0 4px rgba(0,185,138,.15);
  border: none;
}
.accordion-button::after {
  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 16 16' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M4 6L8 10L12 6' stroke='%2300B98A' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/18px no-repeat;
  width: 20px;
  height: 20px;
  transition: transform .3s ease;
}
.accordion-button:not(.collapsed)::after { transform: rotate(180deg); }
.accordion-body {
  padding: 0 24px 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.cta-section { padding: 72px 0 88px; }
.cta-box {
  background: linear-gradient(135deg, var(--primary-dark), var(--dark));
  border-radius: var(--radius-lg);
  padding: 62px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-box::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}
.cta-box::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 46px 46px;
  pointer-events: none;
}
.cta-box h2 {
  color: #fff;
  font-size: 32px;
  font-weight: 800;
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}
.cta-box p {
  color: rgba(255,255,255,.72);
  font-size: 16px;
  max-width: 560px;
  margin: 0 auto 34px;
}
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  position: relative;
  z-index: 1;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all .2s ease;
  text-decoration: none;
  line-height: 1.4;
}
.btn:active { transform: scale(.97); }
.btn:focus-visible {
  outline: 3px solid rgba(0,185,138,.35);
  outline-offset: 2px;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: 0 6px 16px rgba(0,185,138,.18);
}
.btn-primary:hover {
  filter: brightness(1.06);
  transform: translateY(-2px);
  color: #fff;
  box-shadow: 0 8px 24px rgba(0,185,138,.3);
}
.btn-outline-light {
  background: transparent;
  border-color: rgba(255,255,255,.6);
  color: #fff;
}
.btn-outline-light:hover {
  background: rgba(255,255,255,.14);
  color: #fff;
  transform: translateY(-2px);
  border-color: #fff;
}
.btn-accent {
  background: linear-gradient(135deg, var(--accent), #F25C05);
  color: #fff;
  box-shadow: 0 6px 16px rgba(255,122,26,.25);
}
.btn-accent:hover {
  filter: brightness(1.06);
  transform: translateY(-2px);
  color: #fff;
}
.btn-light-glow {
  background: #fff;
  color: var(--primary-dark);
}
.btn-light-glow:hover {
  background: var(--primary-light);
  color: var(--primary-dark);
  transform: translateY(-2px);
}

.site-footer {
  background: var(--dark);
  color: rgba(255,255,255,.7);
  border-top: 4px solid transparent;
  background-image: linear-gradient(var(--dark), var(--dark)), linear-gradient(135deg, var(--primary), var(--primary-dark));
  background-origin: padding-box, border-box;
  background-clip: padding-box, border-box;
  border-color: transparent;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
  padding: 56px 0 40px;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #fff;
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 16px;
}
.footer-desc {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255,255,255,.55);
  max-width: 360px;
  margin: 0;
}
.footer-title {
  color: rgba(255,255,255,.9);
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 18px;
}
.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.footer-links a {
  color: rgba(255,255,255,.65);
  font-size: 15px;
}
.footer-links a:hover { color: var(--primary); }
.footer-contact p {
  margin: 0 0 12px;
  font-size: 15px;
  color: rgba(255,255,255,.65);
  display: flex;
  align-items: center;
  gap: 8px;
}
.contact-icon { font-style: normal; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding: 20px 0;
  font-size: 13px;
  color: rgba(255,255,255,.4);
  text-align: center;
}
.footer-bottom p { margin: 0; }

@media (max-width: 1199px) {
  .sidebar { width: 88px; padding: 22px 14px; }
  .sidebar-brand-text,
  .nav-item span,
  .sidebar-cta-link div { display: none; }
  .sidebar-brand { justify-content: center; padding-left: 0; padding-right: 0; }
  .nav-item { justify-content: center; }
  .nav-item:hover { transform: none; }
  .sidebar-cta-link { justify-content: center; }
  .main-area { margin-left: 88px; }
}
@media (max-width: 991px) {
  .sidebar { display: none; }
  .main-area { margin-left: 0; }
  .mobile-header { display: flex; }
  .hero { padding: 120px 0 64px; }
  .hero h1 { font-size: 36px; }
  .hero-inner { grid-template-columns: 1fr; gap: 36px; }
  .faq-layout { grid-template-columns: 1fr; gap: 32px; }
  .stats-inner { grid-template-columns: 1fr; gap: 40px; }
  .section { padding: 60px 0; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 767px) {
  .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr; }
  .hero-board { grid-template-columns: 1fr 1fr; }
  .hero-actions .btn { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .cta-box { padding: 44px 22px; }
  .cta-box h2 { font-size: 26px; }
  .stats-grid { gap: 12px; }
  .stat-num { font-size: 34px; }
}
@media (max-width: 575px) {
  .container-custom { padding-left: 16px; padding-right: 16px; }
  .hero { padding: 104px 0 48px; }
  .hero h1 { font-size: 30px; }
  .hero-sub { font-size: 16px; }
  .hero-board { gap: 12px; }
  .board-card { padding: 18px 16px; }
  .board-num { font-size: 30px; }
  .section { padding: 48px 0; }
  .section-head h2 { font-size: 26px; }
  .stats-section { padding: 56px 0; }
  .stats-grid { grid-template-columns: 1fr; }
  .stat-item { border-right: none; border-bottom: 1px dashed rgba(255,255,255,.12); padding: 14px 0; }
  .stat-item:nth-child(2n) { border-right: none; }
  .stat-item:nth-child(n+3) { border-top: none; }
  .faq-accordion .accordion-button { font-size: 15px; padding: 16px 18px; }
  .accordion-body { padding: 0 18px 16px; font-size: 14px; }
  .cta-actions .btn { width: 100%; }
  .cta-box h2 { font-size: 24px; }
  .cta-box p { font-size: 15px; }
  .mobile-nav-item { font-size: 24px; }
}

/* roulang page: article */
:root {
    --primary: #00B98A;
    --primary-dark: #007E7A;
    --accent: #FF7A1A;
    --bg-body: #F5F6F2;
    --bg-dark: #0C1D1C;
    --bg-soft: #E8F6EF;
    --text-main: #16211F;
    --text-sub: #5C6B68;
    --border: #E2E8E4;
    --white: #FFFFFF;
    --radius-card: 20px;
    --radius-panel: 24px;
    --radius-btn: 10px;
    --radius-tag: 999px;
    --shadow-card: 0 2px 12px rgba(12,29,28,.06);
    --shadow-hover: 0 10px 32px rgba(12,29,28,.12);
    --shadow-badge: 0 6px 16px rgba(0,185,138,.18);
    --sidebar-w: 264px;
    --sidebar-collapsed: 88px;
    --font-cn: "PingFang SC","HarmonicOS Sans SC","Microsoft YaHei",sans-serif;
    --font-num: "Inter","Roboto","DIN",sans-serif;
    --transition: .25s ease;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg-body);color:var(--text-main);font-family:var(--font-cn);line-height:1.75;-webkit-font-smoothing:antialiased;font-size:16px}
a{color:var(--primary);text-decoration:none;transition:color var(--transition)}
a:hover{color:var(--accent)}
img{max-width:100%;display:block}
ul,ol{list-style:none}
button,input,select,textarea{font-family:inherit}

/* ===== 侧边导航 ===== */
.sidebar{
    position:fixed;left:0;top:0;bottom:0;width:var(--sidebar-w);
    background:var(--bg-dark);border-right:4px solid var(--primary);
    z-index:1040;display:flex;flex-direction:column;padding:32px 20px;
    overflow-x:hidden;transition:width .3s ease;
}
.sidebar-brand{display:flex;align-items:center;gap:12px;padding:0 8px;margin-bottom:44px;white-space:nowrap}
.brand-logo{width:44px;height:44px;flex-shrink:0;border-radius:10px}
.brand-text{color:#fff;font-size:20px;font-weight:800;letter-spacing:-0.02em}
.sidebar-nav{display:flex;flex-direction:column;gap:8px;flex:1}
.nav-item{
    display:flex;align-items:center;gap:12px;padding:13px 14px;border-radius:12px;
    color:rgba(255,255,255,.6);white-space:nowrap;position:relative;
    transition:background var(--transition),color var(--transition),transform .16s ease;
}
.nav-item:hover{background:rgba(255,255,255,.06);color:#fff;transform:translateX(4px)}
.nav-item.active{background:rgba(0,185,138,.12);color:#fff}
.nav-item.active::before{
    content:"";position:absolute;left:-20px;top:10px;bottom:10px;width:4px;
    border-radius:0 4px 4px 0;background:var(--primary);
}
.nav-icon{width:20px;height:20px;flex-shrink:0}
.sidebar-bottom{padding-top:20px;border-top:1px solid rgba(255,255,255,.08)}
.consult-link{
    display:flex;align-items:center;justify-content:center;gap:8px;
    background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.08);
    color:rgba(255,255,255,.8);padding:12px;border-radius:var(--radius-card);
    font-size:14px;font-weight:600;white-space:nowrap;
    transition:background var(--transition),color var(--transition);
}
.consult-link:hover{background:rgba(0,185,138,.15);color:#fff}

/* ===== 移动端顶部导航 ===== */
.mobile-header{
    display:none;position:fixed;top:0;left:0;right:0;height:64px;
    background:var(--bg-dark);border-bottom:3px solid var(--primary);
    align-items:center;justify-content:space-between;padding:0 16px;z-index:1050;
}
.mobile-brand{display:flex;align-items:center;gap:8px;color:#fff;font-weight:800;font-size:18px}
.mobile-brand svg{width:32px;height:32px;border-radius:8px}
.burger{
    background:none;border:none;width:44px;height:44px;display:flex;flex-direction:column;
    align-items:center;justify-content:center;gap:6px;cursor:pointer;z-index:1060;padding:0;
}
.burger span{display:block;width:22px;height:2px;background:#fff;border-radius:2px;transition:transform .3s ease,opacity .3s ease}
.burger.open span:nth-child(1){transform:translateY(4px) rotate(45deg)}
.burger.open span:nth-child(2){transform:translateY(-4px) rotate(-45deg)}
.mobile-drawer{
    display:none;position:fixed;inset:0;z-index:1045;
    background:linear-gradient(135deg,var(--bg-dark),var(--primary-dark));
    padding:72px 40px 40px;flex-direction:column;align-items:center;
}
.mobile-drawer.nav-open{display:flex}
.drawer-nav{flex:1;display:flex;flex-direction:column;justify-content:center;gap:8px;width:100%}
.drawer-link{
    display:block;color:rgba(255,255,255,.75);font-size:26px;font-weight:600;
    text-align:center;padding:16px 0;border-radius:12px;
    transition:background .2s,color .2s;
}
.drawer-link:hover,.drawer-link.active{color:#fff;background:rgba(255,255,255,.06)}
.mobile-drawer-bottom{color:rgba(255,255,255,.5);font-size:13px;text-align:center;margin-top:auto}

/* ===== 主内容区 ===== */
.main-wrapper{margin-left:var(--sidebar-w);min-height:100vh;display:flex;flex-direction:column}
.container-custom{max-width:1280px;margin:0 auto;padding:0 24px;width:100%}

/* ===== 文章页主体 ===== */
.article-main{flex:1;padding:56px 0 80px}
.article-card{
    background:var(--white);border-radius:var(--radius-panel);
    border:1px solid var(--border);box-shadow:var(--shadow-card);
    padding:48px;margin-bottom:32px;
}
.article-header{margin-bottom:32px}
.article-title{
    font-size:32px;font-weight:800;letter-spacing:-0.02em;line-height:1.3;
    margin-bottom:20px;color:var(--text-main);
}
.article-meta{
    display:flex;flex-wrap:wrap;gap:16px 28px;font-size:13px;color:var(--text-sub);
    border-top:1px solid var(--border);padding-top:18px;align-items:center;
}
.meta-item{display:inline-flex;align-items:center;gap:6px}
.meta-icon{width:16px;height:16px;color:var(--primary-dark)}
.article-featured{border-radius:16px;overflow:hidden;margin-bottom:36px;aspect-ratio:16/5.5;background:var(--bg-soft)}
.article-featured img{width:100%;height:100%;object-fit:cover}

/* ===== 文章正文 ===== */
.article-content{font-size:16px;line-height:1.9;color:var(--text-main)}
.article-content h2{
    font-size:24px;font-weight:700;padding-left:16px;border-left:4px solid var(--primary);
    margin:44px 0 16px;line-height:1.4;
}
.article-content h3{font-size:18px;font-weight:600;margin:32px 0 14px;color:var(--text-main)}
.article-content p{margin:0 0 26px}
.article-content a{color:var(--primary);border-bottom:1px solid transparent}
.article-content a:hover{color:var(--accent);border-bottom-color:var(--accent)}
.article-content blockquote{
    background:var(--bg-soft);border-left:4px solid var(--primary);
    padding:22px 26px;border-radius:0 14px 14px 0;margin:28px 0;color:var(--text-sub);font-style:normal;
}
.article-content ul,.article-content ol{padding-left:26px;margin-bottom:26px}
.article-content ul li{list-style:disc;margin-bottom:10px;padding-left:4px}
.article-content ol li{list-style:decimal;margin-bottom:10px;padding-left:4px}
.article-content table{width:100%;border-collapse:collapse;margin:28px 0;font-size:15px}
.article-content th,.article-content td{border:1px solid var(--border);padding:12px 16px;text-align:left}
.article-content th{background:var(--bg-soft);font-weight:600}
.article-content img{border-radius:16px;margin:28px 0}
.article-content hr{border:none;border-top:1px solid var(--border);margin:36px 0}

/* ===== 文章底部 ===== */
.article-footer{
    display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;
    gap:16px;border-top:1px solid var(--border);padding-top:26px;margin-top:44px;
}
.article-tags{display:flex;flex-wrap:wrap;gap:8px}
.tag{
    background:var(--bg-soft);color:var(--primary-dark);font-size:13px;font-weight:500;
    padding:6px 14px;border-radius:var(--radius-tag);transition:background .2s,color .2s;
}
.tag:hover{background:var(--primary);color:#fff}
.share-placeholder{display:flex;align-items:center;gap:10px;color:var(--text-sub);font-size:14px}
.share-icon{
    width:34px;height:34px;border-radius:9px;background:var(--bg-body);
    display:inline-flex;align-items:center;justify-content:center;color:var(--text-sub);
    transition:background .2s,color .2s;
}
.share-icon:hover{background:var(--bg-soft);color:var(--primary)}

/* ===== 面包屑 ===== */
.breadcrumb-wrap{
    display:flex;align-items:center;flex-wrap:wrap;gap:10px;
    font-size:14px;color:var(--text-sub);margin-bottom:28px;
}
.breadcrumb-wrap a{color:var(--text-sub)}
.breadcrumb-wrap a:hover{color:var(--primary)}
.breadcrumb-divider{color:#B8C2BE}
.breadcrumb-current{color:var(--text-main);font-weight:600;max-width:320px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* ===== 上下篇 ===== */
.article-pager{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-bottom:52px}
.pager-card{
    background:var(--white);border:1px solid var(--border);border-radius:var(--radius-card);
    padding:20px 24px;display:block;min-width:0;
    transition:box-shadow var(--transition),transform var(--transition),border-color var(--transition);
}
.pager-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px);border-color:var(--primary)}
.pager-card.next{text-align:right}
.pager-label{display:block;font-size:13px;color:var(--text-sub);margin-bottom:6px}
.pager-title{
    font-size:15px;font-weight:600;color:var(--text-main);display:block;
    overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.pager-card:hover .pager-title{color:var(--primary)}

/* ===== 相关阅读 ===== */
.related-section{margin-bottom:52px}
.related-section h2{font-size:28px;font-weight:700;margin-bottom:26px;color:var(--text-main)}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.related-card{
    background:var(--white);border-radius:var(--radius-card);border:1px solid var(--border);
    overflow:hidden;display:flex;flex-direction:column;height:100%;
    transition:box-shadow var(--transition),transform var(--transition),border-color var(--transition);
}
.related-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px);border-color:var(--primary)}
.related-card .card-img{aspect-ratio:16/10;width:100%;object-fit:cover;background:var(--bg-soft)}
.related-body{padding:18px 20px 20px;display:flex;flex-direction:column;flex:1}
.related-cat{
    font-size:12px;color:var(--primary-dark);background:var(--bg-soft);
    padding:4px 12px;border-radius:var(--radius-tag);display:inline-block;
    align-self:flex-start;margin-bottom:12px;font-weight:500;
}
.related-body h3{
    font-size:16px;font-weight:600;line-height:1.5;color:var(--text-main);
    display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
    min-height:48px;transition:color .2s;
}
.related-card:hover .related-body h3{color:var(--primary)}
.related-date{font-size:12px;color:var(--text-sub);margin-top:auto;padding-top:12px}

/* ===== 返回列表 ===== */
.back-to-list a{
    display:inline-flex;align-items:center;gap:8px;font-size:15px;font-weight:600;
    color:var(--text-main);transition:color .2s;
}
.back-to-list a:hover{color:var(--primary)}
.back-to-list svg{width:18px;height:18px}

/* ===== 未找到 ===== */
.not-found{
    text-align:center;padding:140px 24px;background:var(--white);
    border-radius:var(--radius-panel);border:1px solid var(--border);
    box-shadow:var(--shadow-card);
}
.not-found h1{font-size:32px;font-weight:800;margin-bottom:16px;color:var(--text-main)}
.not-found p{color:var(--text-sub);margin-bottom:28px}
.not-found .btn{display:inline-flex}

/* ===== 按钮 ===== */
.btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    font-weight:600;border-radius:var(--radius-btn);padding:12px 28px;
    font-size:15px;line-height:1.5;border:2px solid transparent;
    transition:background var(--transition),color var(--transition),
    border-color var(--transition),transform .2s ease,box-shadow var(--transition);
    cursor:pointer;
}
.btn:focus-visible{outline:3px solid rgba(0,185,138,.35);outline-offset:2px}
.btn-brand{
    background:linear-gradient(135deg,var(--primary),var(--primary-dark));
    color:#fff;box-shadow:0 4px 14px rgba(0,185,138,.25);
}
.btn-brand:hover{color:#fff;background:linear-gradient(135deg,var(--primary-dark),#006e6a);transform:translateY(-2px);box-shadow:0 8px 20px rgba(0,185,138,.3)}
.btn-brand:active{transform:translateY(0) scale(.97)}

/* ===== 页脚 ===== */
.site-footer{
    background:var(--bg-dark);border-top:4px solid var(--primary);
    padding:64px 0 24px;margin-top:32px;
}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:48px;margin-bottom:48px}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-size:20px;font-weight:800;margin-bottom:16px}
.footer-brand svg{width:36px;height:36px;border-radius:9px}
.footer-desc{color:rgba(255,255,255,.7);font-size:14px;line-height:1.8;max-width:380px}
.footer-title{color:rgba(255,255,255,.9);font-size:16px;font-weight:600;margin-bottom:16px}
.footer-links li{margin-bottom:10px}
.footer-links a{color:rgba(255,255,255,.7);font-size:14px}
.footer-links a:hover{color:var(--primary)}
.footer-contact p{color:rgba(255,255,255,.7);font-size:14px;margin-bottom:10px}
.contact-icon{margin-right:8px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding-top:24px;text-align:center;color:rgba(255,255,255,.5);font-size:13px}

/* ===== 响应式 ===== */
@media (min-width:992px) and (max-width:1199px){
    .sidebar{width:var(--sidebar-collapsed);padding:28px 14px}
    .sidebar:hover{width:var(--sidebar-w)}
    .sidebar .brand-text,.sidebar .nav-item span,.sidebar .consult-text{display:none}
    .sidebar:hover .brand-text,.sidebar:hover .nav-item span,.sidebar:hover .consult-text{display:inline-block}
    .sidebar .nav-item,.sidebar .sidebar-brand,.sidebar .consult-link{justify-content:center}
    .sidebar:hover .nav-item,.sidebar:hover .sidebar-brand,.sidebar:hover .consult-link{justify-content:flex-start}
    .sidebar .nav-item.active::before{left:-14px}
    .sidebar:hover .nav-item.active::before{left:-20px}
    .main-wrapper{margin-left:var(--sidebar-collapsed)}
}
@media (max-width:991px){
    .sidebar{display:none}
    .mobile-header{display:flex}
    .main-wrapper{margin-left:0}
    .article-main{padding:24px 0 56px}
    .container-custom{padding:0 16px}
}
@media (max-width:767px){
    .article-card{padding:28px 20px}
    .article-title{font-size:27px}
    .related-grid{grid-template-columns:1fr}
    .article-pager{grid-template-columns:1fr;gap:16px}
    .footer-grid{grid-template-columns:1fr;gap:32px}
    .article-featured{aspect-ratio:16/6}
}
@media (max-width:520px){
    .article-card{padding:22px 16px}
    .article-title{font-size:24px;line-height:1.35}
    .article-content{font-size:15px;line-height:1.85}
    .article-content h2{font-size:21px}
    .section-gap{padding:32px 0}
    .breadcrumb-current{max-width:180px}
    .related-body h3{min-height:0}
    .pager-title{white-space:normal}
}