/* roulang page: index */
:root {
  --color-bg: #0B0F14;
  --color-panel: #111820;
  --color-panel-hover: #151E29;
  --color-line: #223040;
  --color-line-light: rgba(255,255,255,0.08);
  --color-mint: #8BE28C;
  --color-mint-dark: #6CCB6E;
  --color-mint-light: #ABE8A8;
  --color-amber: #E5AC56;
  --color-text: #E4EAF0;
  --color-muted: #94A3B3;
  --color-error: #CE5B4E;
  --color-success: #58A87C;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-number: "SF Mono", "Roboto Mono", "Menlo", monospace;
  --radius: 4px;
  --space-section: 112px;
  --space-section-mobile: 64px;
  --container: 1200px;
  --transition: 0.2s ease-out;
  --header-top-h: 72px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-sans); background: var(--color-bg); color: var(--color-text); line-height: 1.85; font-size: 16px; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--transition), border-color var(--transition), background var(--transition), transform var(--transition); }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input { font-family: inherit; }
ul, ol { list-style: none; }
:focus-visible { outline: 2px solid var(--color-mint); outline-offset: 2px; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ===== Header & Nav ===== */
.site-header { position: sticky; top: 0; z-index: 100; background: rgba(8,12,17,0.82); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-bottom: 1px solid transparent; transition: background var(--transition), border-color var(--transition); }
.site-header.scrolled { background: rgba(8,12,17,0.85); border-bottom-color: var(--color-line-light); }
.header-top { display: flex; align-items: center; justify-content: space-between; height: var(--header-top-h); transition: height 0.2s ease-out; }
.site-header.scrolled .header-top { height: 56px; }
.logo { display: flex; align-items: center; gap: 12px; font-size: 1.05rem; font-weight: 800; letter-spacing: -0.01em; color: var(--color-text); }
.logo-mark { width: 10px; height: 10px; background: var(--color-mint); display: block; margin-top: -18px; margin-left: 42px; position: absolute; }
.logo-text { white-space: nowrap; }
.header-search { flex: 1; max-width: 380px; margin: 0 32px; }
.header-search form { display: flex; align-items: center; border-bottom: 1px solid #334156; transition: border-color var(--transition); position: relative; }
.header-search form:focus-within { border-bottom-color: var(--color-mint); box-shadow: 0 1px 0 0 var(--color-mint); }
.header-search input { flex: 1; height: 40px; background: transparent; border: none; outline: none; color: var(--color-text); font-size: 0.9rem; padding: 0 8px; }
.header-search input::placeholder { color: #738396; }
.header-search button { width: 32px; height: 40px; display: flex; align-items: center; justify-content: center; color: var(--color-muted); transition: color var(--transition); }
.header-search button:hover { color: var(--color-mint); }
.header-search button svg { width: 16px; height: 16px; }
.menu-toggle { display: none; flex-direction: column; justify-content: center; gap: 5px; width: 44px; height: 44px; padding: 0; }
.menu-toggle span { display: block; width: 22px; height: 2px; background: var(--color-text); border-radius: 2px; transition: background var(--transition); }
.header-bottom { display: flex; align-items: center; justify-content: space-between; padding-top: 0; padding-bottom: 0; border-top: 1px solid rgba(255,255,255,0.04); }
.channel-nav { display: flex; align-items: center; gap: 0; }
.channel-nav .nav-link { position: relative; display: block; padding: 14px 18px 12px; font-size: 0.95rem; font-weight: 600; color: var(--color-muted); transition: color var(--transition); }
.channel-nav .nav-link::after { content: ''; position: absolute; left: 18px; right: 18px; bottom: -1px; height: 2px; background: var(--color-mint); transform: scaleX(0); transform-origin: left; transition: transform var(--transition); }
.channel-nav .nav-link:hover { color: var(--color-mint); }
.channel-nav .nav-link:hover::after { transform: scaleX(1); }
.channel-nav .nav-link.active { color: var(--color-mint); }
.channel-nav .nav-link.active::after { transform: scaleX(1); }
.trending { display: flex; align-items: center; gap: 6px; font-size: 0.8rem; }
.trending-label { color: var(--color-muted); opacity: 0.7; margin-right: 4px; }
.trending-item { color: var(--color-muted); padding: 4px 8px; border: 1px solid transparent; border-radius: 999px; transition: all var(--transition); }
.trending-item:hover { color: var(--color-mint); border-color: rgba(139,226,140,0.3); }

/* Mobile Drawer */
.mobile-drawer { position: fixed; top: 0; right: 0; bottom: 0; width: 100%; max-width: 320px; background: #0B0F14; z-index: 200; transform: translateX(100%); transition: transform 0.3s ease-out; padding: 24px; display: flex; flex-direction: column; }
.mobile-drawer.open { transform: translateX(0); box-shadow: -20px 0 60px rgba(0,0,0,0.6); }
.drawer-close { position: absolute; top: 16px; right: 16px; width: 40px; height: 40px; font-size: 1.6rem; color: var(--color-muted); display: flex; align-items: center; justify-content: center; transition: color var(--transition); }
.drawer-close:hover { color: var(--color-mint); }
.drawer-nav { margin-top: 56px; display: flex; flex-direction: column; }
.drawer-link { font-size: 1.4rem; line-height: 2.4; font-weight: 700; color: var(--color-text); border-bottom: 1px solid rgba(255,255,255,0.05); transition: color var(--transition); padding-left: 4px; }
.drawer-link:hover { color: var(--color-mint); }
.drawer-link.active { color: var(--color-mint); }
.drawer-search { margin: 24px 0; }
.drawer-search form { display: flex; align-items: center; border-bottom: 1px solid #334156; }
.drawer-search input { flex: 1; height: 44px; background: transparent; border: none; outline: none; color: var(--color-text); font-size: 0.95rem; }
.drawer-search button { padding: 0 8px; color: var(--color-mint); }
.drawer-tags { margin-top: auto; display: flex; flex-wrap: wrap; gap: 8px; }
.drawer-tag-title { width: 100%; font-size: 0.8rem; color: var(--color-muted); opacity: 0.7; }
.drawer-tags .tag { font-size: 0.85rem; color: var(--color-muted); padding: 4px 12px; border-radius: 999px; border: 1px solid rgba(255,255,255,0.12); transition: all var(--transition); }
.drawer-tags .tag:hover { color: var(--color-mint); border-color: var(--color-mint); }
.drawer-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 150; opacity: 0; visibility: hidden; transition: all 0.3s; }
.drawer-overlay.active { opacity: 1; visibility: visible; }

/* ===== Hero ===== */
.hero { position: relative; min-height: 82vh; display: flex; align-items: center; background: linear-gradient(90deg, rgba(11,15,20,0.94) 0%, rgba(11,15,20,0.78) 55%, rgba(11,15,20,0.4) 100%), url('/assets/images/backpic/back-1.png') center/cover no-repeat; padding: 72px 0 64px; }
.hero-inner { display: flex; flex-direction: column; align-items: flex-start; max-width: 760px; }
.hero-eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: 0.82rem; color: var(--color-mint); padding: 4px 14px; border: 1px solid rgba(139,226,140,0.3); border-radius: 999px; margin-bottom: 28px; letter-spacing: 0.02em; }
.hero-eyebrow svg { width: 12px; height: 12px; }
.hero-title { font-size: clamp(2.6rem, 6vw, 4.4rem); font-weight: 800; letter-spacing: -0.02em; line-height: 1.15; max-width: 12em; color: var(--color-text); }
.hero-subline { display: block; font-size: clamp(1rem, 2.2vw, 1.5rem); font-weight: 500; color: var(--color-muted); margin-top: 6px; letter-spacing: 0; }
.hero-desc { font-size: 1.05rem; color: var(--color-muted); margin-top: 24px; max-width: 46em; line-height: 1.8; }
.hero-cta { display: flex; gap: 16px; margin-top: 36px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 13px 28px; border-radius: var(--radius); font-size: 0.95rem; font-weight: 700; transition: all var(--transition); }
.btn-primary { background: var(--color-mint); color: #0B0F14; }
.btn-primary:hover { background: var(--color-mint-light); transform: translateY(-1px); box-shadow: 0 4px 20px rgba(139,226,140,0.15); }
.btn-secondary { background: transparent; border: 1px solid rgba(255,255,255,0.25); color: var(--color-text); }
.btn-secondary:hover { border-color: var(--color-mint); color: var(--color-mint); }
.btn-text { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; font-size: 0.9rem; color: var(--color-muted); transition: all var(--transition); }
.btn-text .arrow { transition: transform var(--transition); }
.btn-text:hover { color: var(--color-mint); }
.btn-text:hover .arrow { transform: translateX(4px); }
.hero-note { margin-top: 24px; font-size: 0.8rem; color: var(--color-muted); opacity: 0.6; }
.hero-trust { margin-top: 56px; border-top: 1px solid rgba(255,255,255,0.08); padding-top: 32px; width: 100%; display: flex; gap: 48px; flex-wrap: wrap; }
.trust-item { display: flex; flex-direction: column; gap: 4px; }
.trust-num { font-family: var(--font-number); font-size: 1.8rem; font-weight: 700; color: var(--color-mint); line-height: 1; }
.trust-label { font-size: 0.85rem; color: var(--color-text); font-weight: 600; }
.trust-sub { font-size: 0.8rem; color: var(--color-muted); opacity: 0.7; }

/* ===== Section Common ===== */
.section { padding: var(--space-section) 0; }
.section-label { display: flex; align-items: center; gap: 10px; font-family: var(--font-number); font-size: 0.8rem; color: var(--color-mint); letter-spacing: 0.2em; margin-bottom: 16px; }
.section-label::before { content: ''; width: 28px; height: 1px; background: var(--color-mint); opacity: 0.6; }
.section-title { font-size: clamp(1.75rem, 3.4vw, 2.25rem); font-weight: 700; letter-spacing: -0.01em; line-height: 1.3; margin-bottom: 16px; }
.section-desc { color: var(--color-muted); font-size: 1rem; max-width: 640px; line-height: 1.8; }

/* ===== Problems ===== */
.problems { background: var(--color-panel); border-top: 1px solid var(--color-line-light); border-bottom: 1px solid var(--color-line-light); }
.problem-list { margin-top: 40px; }
.problem-item { display: flex; align-items: baseline; gap: 24px; padding: 28px 0 28px 6px; border-bottom: 1px solid rgba(255,255,255,0.06); transition: background var(--transition), padding-left var(--transition); }
.problem-item:last-child { border-bottom: none; }
.problem-item:hover { background: rgba(255,255,255,0.02); padding-left: 12px; }
.problem-num { font-family: var(--font-number); font-size: 1rem; color: var(--color-muted); min-width: 36px; transition: color var(--transition); }
.problem-item:hover .problem-num { color: var(--color-mint); }
.problem-title { font-size: 1.02rem; font-weight: 600; min-width: 180px; flex-shrink: 0; }
.problem-desc { font-size: 0.88rem; color: var(--color-muted); line-height: 1.7; }

/* ===== Solution ===== */
.solution-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 64px; align-items: start; }
.solution-left { position: sticky; top: 120px; }
.solution-right { display: flex; flex-direction: column; gap: 0; }
.solution-step { display: flex; gap: 24px; padding: 32px 0; border-bottom: 1px solid rgba(255,255,255,0.06); }
.solution-step:first-child { padding-top: 0; }
.solution-step:last-child { border-bottom: none; }
.step-num { font-family: var(--font-number); font-size: 1.2rem; color: var(--color-mint); min-width: 40px; line-height: 1.4; }
.step-body h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; }
.step-body p { font-size: 0.95rem; color: var(--color-muted); line-height: 1.75; }
.step-icon { display: inline-flex; align-items: center; justify-content: center; width: 32px; height: 32px; margin-top: 4px; color: var(--color-mint); }
.step-icon svg { width: 22px; height: 22px; }

/* ===== Results ===== */
.results { background: #090D11; border-top: 1px solid var(--color-line-light); border-bottom: 1px solid var(--color-line-light); }
.results-strip { display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.result-item { flex: 1; min-width: 160px; display: flex; flex-direction: column; align-items: center; text-align: center; padding: 16px 24px; border-left: 1px solid rgba(255,255,255,0.06); }
.result-item:first-child { border-left: none; }
.result-num { font-family: var(--font-number); font-size: 2.8rem; font-weight: 800; color: var(--color-mint); line-height: 1; }
.result-label { margin-top: 12px; font-size: 0.95rem; font-weight: 600; color: var(--color-text); }
.result-sub { margin-top: 4px; font-size: 0.8rem; color: var(--color-muted); opacity: 0.7; }

/* ===== Testimonials ===== */
.testimonial-list { padding: 0; }
.testimonial-item { display: flex; gap: 32px; margin-bottom: 36px; padding: 8px 0; border-left: 2px solid var(--color-mint); padding-left: 32px; }
.testimonial-item:last-child { margin-bottom: 0; }
.testimonial-quote { font-size: 1.15rem; line-height: 1.8; color: var(--color-text); margin-bottom: 12px; }
.testimonial-quote::before { content: '“'; font-size: 2.4rem; color: var(--color-mint); font-family: Georgia, serif; line-height: 0; display: block; margin-bottom: 8px; }
.testimonial-author { font-size: 0.85rem; color: var(--color-muted); }

/* ===== News ===== */
.news-section { background: var(--color-panel); border-top: 1px solid var(--color-line-light); border-bottom: 1px solid var(--color-line-light); }
.news-header { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 32px; }
.news-list-item { display: flex; align-items: center; gap: 24px; padding: 20px 0; border-bottom: 1px solid rgba(255,255,255,0.05); transition: background var(--transition), padding-left var(--transition); }
.news-list-item:last-child { border-bottom: none; }
.news-list-item:hover { background: rgba(255,255,255,0.02); padding-left: 8px; }
.news-thumb { width: 120px; height: 80px; flex-shrink: 0; overflow: hidden; border-radius: var(--radius); background: #1A2436; }
.news-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.3s ease-out; }
.news-list-item:hover .news-thumb img { transform: scale(1.03); }
.news-body { flex: 1; min-width: 0; }
.news-body h3 { font-size: 1rem; font-weight: 600; line-height: 1.5; margin-bottom: 6px; color: var(--color-text); transition: color var(--transition); }
.news-list-item:hover .news-body h3 { color: var(--color-mint); }
.news-body p { font-size: 0.82rem; color: var(--color-muted); line-height: 1.7; overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.news-meta { display: flex; flex-direction: column; align-items: flex-end; gap: 8px; flex-shrink: 0; }
.news-cat { display: inline-block; font-size: 0.72rem; padding: 3px 10px; border-radius: 999px; background: rgba(139,226,140,0.12); color: var(--color-mint); }
.news-date { font-family: var(--font-number); font-size: 0.78rem; color: var(--color-muted); opacity: 0.8; }
.empty-state { display: flex; flex-direction: column; align-items: center; text-align: center; padding: 56px 24px; }
.empty-state-icon { width: 60px; height: 60px; border-radius: 50%; border: 2px dashed rgba(255,255,255,0.2); display: flex; align-items: center; justify-content: center; margin-bottom: 20px; color: var(--color-muted); }
.empty-state-icon svg { width: 24px; height: 24px; }
.empty-state h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
.empty-state p { font-size: 0.88rem; color: var(--color-muted); margin-bottom: 16px; }
.empty-state .btn-text { font-size: 0.85rem; }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 40px auto 0; }
.faq-item { border-bottom: 1px solid rgba(255,255,255,0.06); }
.faq-question { display: flex; align-items: center; justify-content: space-between; padding: 24px 8px; cursor: pointer; font-size: 1rem; font-weight: 600; user-select: none; transition: color var(--transition); }
.faq-question:hover { color: var(--color-mint); }
.faq-icon { position: relative; width: 18px; height: 18px; flex-shrink: 0; transition: transform 0.2s ease-out; }
.faq-icon::before, .faq-icon::after { content: ''; position: absolute; background: var(--color-mint); transition: all 0.2s ease-out; }
.faq-icon::before { left: 0; right: 0; top: 8px; height: 2px; }
.faq-icon::after { top: 0; bottom: 0; left: 8px; width: 2px; }
.faq-item.active .faq-icon { transform: rotate(45deg); }
.faq-answer { display: grid; grid-template-rows: 0fr; transition: grid-template-rows 0.2s ease-out; }
.faq-item.active .faq-answer { grid-template-rows: 1fr; }
.faq-answer-inner { overflow: hidden; }
.faq-answer-inner p { padding: 0 8px 24px; font-size: 0.88rem; color: var(--color-muted); line-height: 1.85; max-width: 720px; }
.faq-more { text-align: center; margin-top: 32px; }

/* ===== CTA ===== */
.cta-section { position: relative; overflow: hidden; padding: 112px 0; background: var(--color-bg); }
.cta-section::before { content: ''; position: absolute; width: 440px; height: 440px; border-radius: 50%; border: 1px solid rgba(139,226,140,0.2); top: 50%; right: -120px; transform: translateY(-50%); pointer-events: none; }
.cta-section::after { content: ''; position: absolute; width: 260px; height: 260px; border-radius: 50%; border: 1px solid rgba(139,226,140,0.12); top: 50%; right: 20px; transform: translateY(-50%); pointer-events: none; }
.cta-content { position: relative; z-index: 1; display: flex; flex-direction: column; align-items: center; text-align: center; }
.cta-content .section-title { font-size: clamp(2rem, 4.5vw, 3rem); }
.cta-sub { font-size: 1.05rem; color: var(--color-muted); margin-bottom: 36px; max-width: 480px; }
.cta-buttons { display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; }

/* ===== Footer ===== */
.site-footer { background: #090D11; border-top: 1px solid rgba(255,255,255,0.06); }
.footer-top { padding: 56px 0 40px; display: grid; grid-template-columns: 1.2fr 1fr; gap: 64px; }
.footer-brand .footer-logo { font-size: 1.2rem; font-weight: 800; display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }
.footer-brand p { font-size: 0.88rem; color: var(--color-muted); max-width: 360px; }
.footer-cols { display: flex; flex-wrap: wrap; gap: 12px 24px; align-content: flex-start; }
.footer-cols a { font-size: 0.9rem; color: var(--color-muted); transition: color var(--transition); position: relative; padding-bottom: 2px; }
.footer-cols a:hover { color: var(--color-mint); }
.footer-cols a::after { content: ''; position: absolute; left: 0; right: 0; bottom: 0; height: 1px; background: var(--color-mint); transform: scaleX(0); transform-origin: left; transition: transform var(--transition); }
.footer-cols a:hover::after { transform: scaleX(1); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.04); padding: 20px 0; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.footer-bottom p { font-size: 0.8rem; color: var(--color-muted); opacity: 0.7; }
.footer-copyright { display: flex; align-items: center; gap: 16px; }
.back-top { font-size: 0.85rem; color: var(--color-muted); display: inline-flex; align-items: center; gap: 6px; transition: color var(--transition); }
.back-top:hover { color: var(--color-mint); }
.back-top .arrow-up { transition: transform var(--transition); }
.back-top:hover .arrow-up { transform: translateY(-3px); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .solution-grid { grid-template-columns: 1fr; gap: 40px; }
  .solution-left { position: static; }
  .header-search { max-width: 280px; margin: 0 16px; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
}
@media (max-width: 768px) {
  .header-search { display: none; }
  .menu-toggle { display: flex; }
  .header-bottom { display: none; }
  .hero { min-height: auto; padding: 80px 0 48px; }
  .hero-trust { gap: 24px; justify-content: flex-start; }
  .trust-item { min-width: calc(50% - 24px); }
  .problem-item { flex-wrap: wrap; gap: 8px 16px; }
  .problem-title { min-width: calc(100% - 52px); }
  .problem-desc { width: 100%; padding-left: 52px; }
  .news-list-item { flex-wrap: wrap; gap: 12px; position: relative; padding-right: 0; }
  .news-thumb { width: 96px; height: 72px; }
  .news-meta { position: absolute; top: 20px; right: 0; align-items: flex-end; }
  .news-body { padding-right: 100px; }
  .results-strip { gap: 0; }
  .result-item { flex: 0 0 50%; padding: 24px 12px; border-left: none; border-bottom: 1px solid rgba(255,255,255,0.06); }
  .result-item:nth-child(odd) { border-right: 1px solid rgba(255,255,255,0.06); }
  .section { padding: var(--space-section-mobile) 0; }
  .testimonial-item { padding-left: 20px; gap: 16px; }
  .cta-section { padding: 72px 0; }
}
@media (max-width: 480px) {
  .container { padding-left: 18px; padding-right: 18px; }
  .hero-title { font-size: 2.4rem; }
  .hero-cta { flex-direction: column; width: 100%; align-items: stretch; }
  .hero-cta .btn { text-align: center; }
  .trust-item { min-width: 100%; }
  .problem-item { padding: 20px 0 20px 4px; }
  .news-thumb { width: 80px; height: 64px; }
  .news-body { padding-right: 0; }
  .news-meta { position: static; flex-direction: row; justify-content: flex-start; margin-top: 4px; }
  .news-list-item { gap: 12px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .cta-buttons .btn { width: 100%; text-align: center; }
}

/* roulang page: category1 */
:root {
  --color-bg: #0B0F14;
  --color-panel: #111820;
  --color-panel-light: #141D27;
  --color-line: #223040;
  --color-line-soft: rgba(255, 255, 255, 0.08);
  --color-mint: #8BE28C;
  --color-mint-bright: #ABE8A8;
  --color-mint-dim: rgba(139, 226, 140, 0.12);
  --color-amber: #E5AC56;
  --color-text: #E4EAF0;
  --color-muted: #94A3B3;
  --color-strong: #FFFFFF;
  --color-warm-bg: #F5F2EC;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-number: "SF Mono", "Roboto Mono", "Menlo", monospace;
  --radius: 4px;
  --space-section: 112px;
  --space-section-mobile: 64px;
  --container-width: 1200px;
  --header-brand-h: 72px;
  --header-channel-h: 48px;
  --transition-base: 0.2s ease-out;
}
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.85;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img {
  max-width: 100%;
  display: block;
}
a {
  color: var(--color-mint);
  text-decoration: none;
  transition: color var(--transition-base);
}
a:hover {
  color: var(--color-mint-bright);
}
button {
  font-family: var(--font-sans);
  cursor: pointer;
  border: none;
  background: none;
}
input {
  font-family: var(--font-sans);
}
:focus-visible {
  outline: 2px solid var(--color-mint);
  outline-offset: 2px;
}
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}
.section {
  padding: var(--space-section) 0;
}
.section-label {
  font-family: var(--font-number);
  font-size: 12px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-mint);
  margin-bottom: 12px;
  display: block;
}
.section-title {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--color-text);
}
.section-desc {
  color: var(--color-muted);
  margin-top: 16px;
  font-size: 16px;
  max-width: 640px;
}
body.menu-open {
  overflow: hidden;
}
.site-header {
  position: relative;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-line-soft);
}
.site-header.is-fixed {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(8, 12, 17, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}
.site-header.is-fixed .header-inner {
  min-height: 56px;
}
.header-inner {
  transition: min-height var(--transition-base);
}
.header-brand-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-brand-h);
  transition: min-height var(--transition-base);
}
.brand-logo {
  display: flex;
  align-items: center;
  gap: 8px;
}
.logo-mark {
  width: 8px;
  height: 8px;
  background: var(--color-mint);
  display: inline-block;
  margin-left: 2px;
  align-self: flex-start;
  margin-top: 6px;
}
.logo-text {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-strong);
  line-height: 1.2;
}
.brand-logo:hover .logo-text {
  color: var(--color-mint);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}
.header-search {
  display: flex;
  align-items: center;
  border-bottom: 1px solid #334156;
  padding: 4px 0;
  width: 220px;
  transition: border-color var(--transition-base);
}
.header-search:focus-within {
  border-bottom-color: var(--color-mint);
}
.header-search input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--color-text);
  font-size: 14px;
  width: 100%;
  padding: 4px 0;
}
.header-search input::placeholder {
  color: #738396;
}
.header-search button {
  color: var(--color-mint);
  display: flex;
  align-items: center;
  padding: 4px;
}
.header-search button svg {
  width: 16px;
  height: 16px;
}
.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  color: var(--color-text);
  transition: all var(--transition-base);
}
.menu-toggle:hover {
  border-color: var(--color-mint);
  color: var(--color-mint);
}
.menu-toggle svg {
  width: 20px;
  height: 20px;
}
.channel-nav {
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-channel-h);
}
.channel-nav-links {
  display: flex;
  align-items: center;
  gap: 0;
  height: var(--header-channel-h);
}
.nav-link {
  display: inline-flex;
  align-items: center;
  height: 100%;
  padding: 0 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  border-bottom: 2px solid transparent;
  transition: color var(--transition-base), border-color var(--transition-base);
  white-space: nowrap;
}
.nav-link:hover {
  color: var(--color-mint);
  border-bottom-color: rgba(139, 226, 140, 0.4);
}
.nav-link.active {
  color: var(--color-mint);
  border-bottom-color: var(--color-mint);
}
.channel-hot {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-right: 8px;
}
.hot-tag {
  font-size: 12px;
  color: var(--color-muted);
  transition: color var(--transition-base);
}
.hot-tag::before {
  content: "#";
  color: var(--color-mint);
  margin-right: 2px;
}
.hot-tag:hover {
  color: var(--color-mint);
}
.mobile-drawer {
  display: none;
}
@media (max-width: 768px) {
  .header-search {
    display: none;
  }
  .menu-toggle {
    display: inline-flex;
  }
  .channel-nav {
    display: none;
  }
  .mobile-drawer {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg);
    z-index: 200;
    transform: translateX(100%);
    transition: transform 0.24s ease-out;
    overflow-y: auto;
  }
  .mobile-drawer.open {
    transform: translateX(0);
  }
  .drawer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--color-line-soft);
  }
  .drawer-close {
    width: 40px;
    height: 40px;
    border: 1px solid var(--color-line);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
  }
  .drawer-close:hover {
    border-color: var(--color-mint);
    color: var(--color-mint);
  }
  .drawer-close svg {
    width: 18px;
    height: 18px;
  }
  .drawer-nav {
    padding: 24px 24px 40px;
  }
  .drawer-nav a {
    display: block;
    font-size: 1.4rem;
    font-weight: 600;
    line-height: 2.4;
    color: var(--color-text);
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  }
  .drawer-nav a:hover,
  .drawer-nav a.active {
    color: var(--color-mint);
  }
  .drawer-search {
    margin: 16px 24px 0;
    display: flex;
    align-items: center;
    border: 1px solid var(--color-line);
    border-radius: var(--radius);
    padding: 0 12px;
    height: 46px;
  }
  .drawer-search input {
    background: transparent;
    border: none;
    outline: none;
    color: var(--color-text);
    font-size: 15px;
    width: 100%;
  }
  .drawer-search input::placeholder {
    color: #738396;
  }
  .drawer-search svg {
    width: 18px;
    height: 18px;
    color: var(--color-mint);
  }
  .drawer-hot {
    padding: 16px 24px 40px;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
  }
  .drawer-hot .hot-tag {
    font-size: 13px;
    padding: 4px 12px;
    border: 1px solid var(--color-line);
    border-radius: 999px;
  }
}
.category-hero {
  position: relative;
  min-height: 380px;
  display: flex;
  align-items: flex-end;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-line-soft);
  overflow: hidden;
}
.category-hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center;
  opacity: 0.4;
}
.category-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(11, 15, 20, 0.95) 0%, rgba(11, 15, 20, 0.72) 40%, rgba(11, 15, 20, 0.35) 100%);
}
.category-hero-content {
  position: relative;
  z-index: 2;
  padding: 80px 0 56px;
  width: 100%;
}
.category-hero h1 {
  font-size: clamp(2.2rem, 4.5vw, 2.8rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--color-strong);
  max-width: 700px;
}
.category-hero-desc {
  font-size: 15px;
  color: var(--color-muted);
  margin-top: 12px;
  max-width: 520px;
}
.category-hero-breadcrumb {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.category-hero-breadcrumb a {
  color: var(--color-muted);
}
.category-hero-breadcrumb a:hover {
  color: var(--color-mint);
}
.category-hero-breadcrumb .sep {
  color: #445566;
}
.category-body {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 64px;
  padding: 72px 24px;
  max-width: var(--container-width);
  margin: 0 auto;
}
.category-index {
  align-self: start;
  position: sticky;
  top: 140px;
  border-left: 1px solid var(--color-line);
  padding-left: 20px;
}
.category-index-label {
  font-family: var(--font-number);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--color-muted);
  text-transform: uppercase;
  margin-bottom: 20px;
}
.category-index-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.category-index-list a {
  display: block;
  padding: 8px 12px;
  font-size: 15px;
  color: var(--color-muted);
  border-left: 2px solid transparent;
  transition: all var(--transition-base);
  margin-left: -21px;
}
.category-index-list a:hover,
.category-index-list a.active {
  color: var(--color-mint);
  border-left-color: var(--color-mint);
  background: rgba(139, 226, 140, 0.04);
}
.category-content {
  min-width: 0;
}
.content-block {
  margin-bottom: 64px;
}
.content-block:last-child {
  margin-bottom: 0;
}
.content-block h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-strong);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.content-block .block-label {
  font-family: var(--font-number);
  font-size: 12px;
  letter-spacing: 0.25em;
  color: var(--color-mint);
  margin-bottom: 8px;
  display: block;
}
.content-block p {
  font-size: 16px;
  color: var(--color-text);
  margin-bottom: 16px;
  line-height: 1.9;
}
.content-block p:last-child {
  margin-bottom: 0;
}
.feature-list {
  list-style: none;
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.7;
  padding: 18px 20px;
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  transition: all var(--transition-base);
}
.feature-list li:hover {
  border-color: rgba(139, 226, 140, 0.4);
  background: var(--color-panel-light);
}
.feature-list .marker {
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-mint);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 4px;
}
.feature-list .marker svg {
  width: 10px;
  height: 10px;
  color: var(--color-mint);
}
.step-list {
  list-style: none;
  counter-reset: step-counter;
  margin-top: 24px;
}
.step-list li {
  counter-increment: step-counter;
  position: relative;
  padding: 24px 0 24px 76px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.step-list li:last-child {
  border-bottom: none;
}
.step-list li::before {
  content: counter(step-counter, decimal-leading-zero);
  font-family: var(--font-number);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-mint);
  position: absolute;
  left: 0;
  top: 26px;
  width: 48px;
  height: 48px;
  border: 1px solid rgba(139, 226, 140, 0.35);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.step-list h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-strong);
  margin-bottom: 6px;
}
.step-list p {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.7;
  margin: 0;
}
.tip-box {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: rgba(139, 226, 140, 0.06);
  border-left: 3px solid var(--color-mint);
  padding: 20px 24px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin-top: 24px;
}
.tip-box svg {
  width: 20px;
  height: 20px;
  color: var(--color-mint);
  flex-shrink: 0;
  margin-top: 3px;
}
.tip-box p {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.8;
  margin: 0;
}
.tip-box .tip-title {
  font-weight: 600;
  color: var(--color-mint);
  display: block;
  margin-bottom: 4px;
}
.category-faq {
  background: #090D11;
  border-top: 1px solid var(--color-line-soft);
  border-bottom: 1px solid var(--color-line-soft);
}
.faq-wrap {
  max-width: 860px;
  margin: 0 auto;
}
.faq-item {
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}
.faq-item:first-child {
  border-top: 1px solid rgba(255, 255, 255, 0.07);
}
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 4px;
  text-align: left;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  transition: color var(--transition-base);
}
.faq-question:hover {
  color: var(--color-mint);
}
.faq-icon {
  width: 24px;
  height: 24px;
  position: relative;
  flex-shrink: 0;
  border: 1px solid var(--color-line);
  border-radius: 50%;
  transition: all var(--transition-base);
}
.faq-icon::before,
.faq-icon::after {
  content: "";
  position: absolute;
  background: var(--color-mint);
  transition: transform var(--transition-base);
}
.faq-icon::before {
  width: 10px;
  height: 2px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.faq-icon::after {
  width: 2px;
  height: 10px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.faq-item.active .faq-icon::after {
  transform: translate(-50%, -50%) scaleY(0);
}
.faq-item.active .faq-icon {
  border-color: var(--color-mint);
}
.faq-answer {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.2s ease-out;
}
.faq-answer > div {
  overflow: hidden;
}
.faq-item.active .faq-answer {
  grid-template-rows: 1fr;
}
.faq-answer p {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.85;
  padding: 0 4px 22px;
  max-width: 680px;
}
.faq-more-link {
  text-align: center;
  margin-top: 32px;
}
.faq-more-link a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  color: var(--color-muted);
  border-bottom: 1px solid var(--color-line);
  padding-bottom: 4px;
  transition: all var(--transition-base);
}
.faq-more-link a:hover {
  color: var(--color-mint);
  border-bottom-color: var(--color-mint);
  gap: 12px;
}
.faq-more-link a::after {
  content: "→";
  transition: transform var(--transition-base);
}
.faq-more-link a:hover::after {
  transform: translateX(4px);
}
.category-cta {
  position: relative;
  overflow: hidden;
  padding: 96px 0;
  text-align: center;
  background: var(--color-bg);
}
.cta-ring {
  position: absolute;
  width: 480px;
  height: 480px;
  border: 1px solid rgba(139, 226, 140, 0.18);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}
.cta-ring::after {
  content: "";
  position: absolute;
  width: 720px;
  height: 720px;
  border: 1px solid rgba(139, 226, 140, 0.08);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.category-cta h2 {
  font-size: clamp(2rem, 4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-strong);
  position: relative;
  z-index: 2;
}
.category-cta .cta-sub {
  font-size: 15px;
  color: var(--color-muted);
  margin-top: 12px;
  position: relative;
  z-index: 2;
}
.cta-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 36px;
  position: relative;
  z-index: 2;
  flex-wrap: wrap;
}
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  transition: all var(--transition-base);
}
.btn-primary {
  background: var(--color-mint);
  color: #0B0F14;
}
.btn-primary:hover {
  background: var(--color-mint-bright);
  color: #0B0F14;
  transform: translateY(-1px);
}
.btn-secondary {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: var(--color-text);
}
.btn-secondary:hover {
  border-color: var(--color-mint);
  color: var(--color-mint);
  transform: translateY(-1px);
}
.site-footer {
  background: #090D11;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 64px 0 32px;
}
.footer-top {
  display: flex;
  justify-content: space-between;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  flex-wrap: wrap;
}
.footer-brand {
  max-width: 320px;
}
.footer-logo {
  display: flex;
  align-items: center;
  margin-bottom: 12px;
}
.footer-logo .logo-text {
  font-size: 1.2rem;
}
.footer-brand p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}
.footer-cols {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  align-items: flex-start;
  padding-top: 4px;
}
.footer-cols a {
  font-size: 14px;
  color: var(--color-muted);
  transition: color var(--transition-base);
  white-space: nowrap;
}
.footer-cols a:hover {
  color: var(--color-mint);
}
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 28px;
  flex-wrap: wrap;
}
.footer-bottom p {
  font-size: 13px;
  color: var(--color-muted);
}
.footer-copyright {
  font-family: var(--font-number);
  letter-spacing: 0.02em;
}
.back-top {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--color-muted);
  padding: 6px 0;
  transition: all var(--transition-base);
}
.back-top .arrow-up {
  display: inline-flex;
  transition: transform var(--transition-base);
}
.back-top:hover {
  color: var(--color-mint);
}
.back-top:hover .arrow-up {
  transform: translateY(-3px);
}
@media (max-width: 1024px) {
  .channel-hot {
    display: none;
  }
  .category-body {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 48px 24px;
  }
  .category-index {
    position: static;
    border-left: none;
    padding-left: 0;
    display: flex;
    align-items: center;
    gap: 16px;
    overflow-x: auto;
    border-bottom: 1px solid var(--color-line);
    padding-bottom: 16px;
  }
  .category-index-label {
    margin-bottom: 0;
    flex-shrink: 0;
  }
  .category-index-list {
    flex-direction: row;
    gap: 4px;
  }
  .category-index-list a {
    margin-left: 0;
    border-left: none;
    border-bottom: 2px solid transparent;
    padding: 6px 12px;
    white-space: nowrap;
  }
  .category-index-list a:hover,
  .category-index-list a.active {
    border-left: none;
    border-bottom-color: var(--color-mint);
    background: transparent;
  }
}
@media (max-width: 768px) {
  .section {
    padding: var(--space-section-mobile) 0;
  }
  .category-hero {
    min-height: 320px;
  }
  .category-hero-content {
    padding: 56px 0 40px;
  }
  .category-hero h1 {
    font-size: 2rem;
  }
  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }
  .btn-primary,
  .btn-secondary {
    width: 100%;
    max-width: 320px;
    justify-content: center;
  }
  .footer-top {
    flex-direction: column;
    gap: 24px;
  }
  .footer-cols {
    gap: 20px;
  }
}
@media (max-width: 480px) {
  body {
    font-size: 15px;
  }
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }
  .header-brand-row {
    min-height: 60px;
  }
  .logo-text {
    font-size: 1.1rem;
  }
  .category-hero {
    min-height: 300px;
  }
  .category-hero-content {
    padding: 48px 0 32px;
  }
  .category-hero h1 {
    font-size: 1.7rem;
  }
  .category-hero-desc {
    font-size: 14px;
  }
  .feature-list li {
    padding: 14px 16px;
  }
  .step-list li {
    padding: 20px 0 20px 60px;
  }
  .step-list li::before {
    width: 40px;
    height: 40px;
    font-size: 0.9rem;
    top: 22px;
  }
  .tip-box {
    padding: 16px 16px;
    flex-direction: column;
    gap: 8px;
  }
  .faq-question {
    font-size: 15px;
    padding: 18px 2px;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* roulang page: article */
:root {
    --color-bg: #0B0F14;
    --color-panel: #111820;
    --color-line: #223040;
    --color-mint: #8BE28C;
    --color-mint-hover: #ABE8A8;
    --color-mint-dim: rgba(139,226,140,0.12);
    --color-amber: #E5AC56;
    --color-ink-text: #E4EAF0;
    --color-muted: #94A3B3;
    --color-dim: #738396;
    --color-paper: #F5F2EC;
    --color-paper-text: #1D252C;
    --color-paper-muted: #7A7F84;
    --color-paper-line: #E3DED2;
    --color-quote: #C9C2B4;
    --color-code-bg: #E9E4DA;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
    --font-number: "SF Mono", "Roboto Mono", "Menlo", monospace;
    --radius: 4px;
    --shadow: 0 12px 40px rgba(0,0,0,0.5);
    --space-section: 112px;
    --header-h: 72px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-ink-text);
    font-size: 16px;
    line-height: 1.85;
    -webkit-font-smoothing: antialiased;
}

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

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

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

button {
    cursor: pointer;
    background: none;
    border: none;
    color: inherit;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 站点导航 ===== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(8, 12, 17, 0.85);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    transition: all 0.2s ease-out;
}

.site-header.scrolled {
    box-shadow: 0 6px 30px rgba(0,0,0,0.4);
}

.header-inner {
    display: flex;
    flex-direction: column;
}

.brand-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0 12px;
    gap: 24px;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.logo-mark {
    width: 10px;
    height: 10px;
    background: var(--color-mint);
    border-radius: 2px;
    display: inline-block;
}

.logo-text {
    font-size: 1.2rem;
    font-weight: 800;
    letter-spacing: 0.01em;
    color: var(--color-ink-text);
    white-space: nowrap;
}

.header-search {
    flex: 0 1 340px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid #334156;
    transition: border-color 0.2s;
}

.header-search:focus-within {
    border-bottom-color: var(--color-mint);
}

.header-search input {
    width: 100%;
    background: transparent;
    border: none;
    outline: none;
    color: var(--color-ink-text);
    font-size: 14px;
    padding: 9px 0;
}

.header-search input::placeholder {
    color: var(--color-dim);
}

.header-search .search-btn {
    padding: 6px 4px 6px 8px;
    color: var(--color-muted);
    transition: color 0.2s;
}

.header-search .search-btn:hover {
    color: var(--color-mint);
}

.menu-btn {
    display: none;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    border: 1px solid rgba(255,255,255,0.1);
    color: var(--color-ink-text);
    transition: border-color 0.2s;
}

.menu-btn:hover {
    border-color: var(--color-mint);
}

.channel-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 0;
    overflow-x: auto;
    scrollbar-width: none;
}

.channel-nav::-webkit-scrollbar {
    display: none;
}

.nav-links {
    display: flex;
    gap: 4px;
}

.nav-link {
    display: inline-block;
    padding: 10px 14px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-muted);
    border-bottom: 2px solid transparent;
    transition: color 0.2s ease-out, border-color 0.2s ease-out;
    white-space: nowrap;
}

.nav-link:hover {
    color: var(--color-mint);
}

.nav-link.active {
    color: var(--color-mint);
    border-bottom-color: var(--color-mint);
}

.nav-trends {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-left: 16px;
    color: var(--color-dim);
    font-size: 12px;
    white-space: nowrap;
    margin-left: auto;
}

.trend-tag {
    color: var(--color-dim);
    transition: color 0.2s;
    font-size: 12px;
}

.trend-tag:hover {
    color: var(--color-mint);
}

.trend-tag::before {
    content: "#";
    color: var(--color-mint);
    margin-right: 2px;
}

/* 移动端抽屉 */
.mobile-drawer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(8,12,17,0.98);
    z-index: 200;
    padding: 24px;
    transform: translateX(-100%);
    transition: transform 0.25s ease-out;
    overflow-y: auto;
}

.mobile-drawer.open {
    transform: translateX(0);
}

.drawer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.drawer-close {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius);
    color: var(--color-ink-text);
    font-size: 1.6rem;
    border: 1px solid rgba(255,255,255,0.1);
}

.drawer-nav {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 32px;
}

.drawer-nav a {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--color-ink-text);
    padding: 10px 0;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.drawer-nav a:hover {
    color: var(--color-mint);
}

.drawer-nav a.active {
    color: var(--color-mint);
}

.drawer-trends {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    padding-top: 16px;
    border-top: 1px solid rgba(255,255,255,0.08);
}

.drawer-trends span {
    font-size: 11px;
    color: var(--color-dim);
    letter-spacing: 0.05em;
}

/* ===== 文章页主体 ===== */
.article-body-wrap {
    background: var(--color-paper);
    color: var(--color-paper-text);
    padding: 56px 0 80px;
}

.article-container {
    max-width: 920px;
    margin: 0 auto;
    padding: 0 24px;
}

.breadcrumb {
    font-size: 13px;
    color: var(--color-paper-muted);
    margin-bottom: 32px;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
}

.breadcrumb a {
    color: var(--color-paper-muted);
    transition: color 0.2s;
}

.breadcrumb a:hover {
    color: #4A7A4D;
}

.breadcrumb .sep {
    margin: 0 4px;
    color: #B4ADA0;
}

.breadcrumb .current {
    color: var(--color-paper-text);
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 260px;
}

.article-header {
    margin-bottom: 40px;
}

.article-cat-badge {
    display: inline-block;
    font-size: 12px;
    padding: 4px 14px;
    border-radius: 999px;
    border: 1px solid #8BE28C;
    color: #3E6B40;
    background: rgba(139,226,140,0.08);
    margin-bottom: 18px;
    letter-spacing: 0.02em;
}

.article-title {
    font-size: clamp(1.75rem, 4vw, 2.4rem);
    font-weight: 800;
    line-height: 1.3;
    color: #161C22;
    max-width: 720px;
    letter-spacing: -0.01em;
    margin-bottom: 16px;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--color-paper-muted);
}

.article-meta .dot {
    width: 3px;
    height: 3px;
    background: #B4ADA0;
    border-radius: 50%;
}

/* ===== 正文阅读区 ===== */
.article-content {
    max-width: 720px;
    font-size: 16px;
    line-height: 1.9;
    color: #1D252C;
}

.article-content p {
    margin-bottom: 1.6em;
}

.article-content h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin: 2em 0 0.8em;
    padding-bottom: 0.4em;
    border-bottom: 1px solid var(--color-paper-line);
    color: #161C22;
    line-height: 1.4;
}

.article-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 1.8em 0 0.6em;
    color: #1D252C;
    line-height: 1.4;
}

.article-content blockquote {
    margin: 1.8em 0;
    padding: 16px 24px;
    background: rgba(201,194,180,0.14);
    border-left: 3px solid var(--color-quote);
    color: #3A4248;
    font-size: 1.05rem;
    border-radius: 0 var(--radius) var(--radius) 0;
}

.article-content blockquote p:last-child {
    margin-bottom: 0;
}

.article-content ul {
    margin: 0 0 1.6em;
    padding-left: 0;
    list-style: none;
}

.article-content ul li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 8px;
}

.article-content ul li::before {
    content: '';
    position: absolute;
    left: 2px;
    top: 0.75em;
    width: 6px;
    height: 6px;
    background: var(--color-paper-text);
    opacity: 0.6;
}

.article-content ol {
    margin: 0 0 1.6em;
    padding-left: 24px;
}

.article-content ol li {
    margin-bottom: 8px;
    padding-left: 4px;
}

.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
    margin: 24px 0;
}

.article-content figure {
    margin: 24px 0;
}

.article-content figcaption {
    text-align: center;
    font-size: 12px;
    color: var(--color-paper-muted);
    margin-top: 8px;
}

.article-content code {
    background: var(--color-code-bg);
    color: #2C353D;
    padding: 2px 8px;
    border-radius: 3px;
    font-family: var(--font-number);
    font-size: 0.9em;
}

.article-content pre {
    background: var(--color-code-bg);
    color: #2C353D;
    padding: 20px;
    border-radius: var(--radius);
    overflow-x: auto;
    font-family: var(--font-number);
    font-size: 0.9rem;
    line-height: 1.7;
    margin: 24px 0;
}

.article-content pre code {
    background: none;
    padding: 0;
}

.article-content a {
    color: #3E6B40;
    text-decoration: underline;
    text-underline-offset: 3px;
    transition: color 0.2s;
}

.article-content a:hover {
    color: #2C4F2E;
}

/* 空文章 */
.not-found-card {
    background: #FFFFFF;
    border: 1px solid var(--color-paper-line);
    border-radius: var(--radius);
    padding: 48px 32px;
    text-align: center;
    max-width: 720px;
}

.not-found-card .empty-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: 2px dashed #C9C2B4;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    color: #A8A094;
}

.not-found-card h2 {
    font-size: 1.4rem;
    color: #1D252C;
    margin-bottom: 8px;
}

.not-found-card p {
    font-size: 14px;
    color: var(--color-paper-muted);
    margin-bottom: 24px;
}

.btn-back-home {
    display: inline-block;
    background: #1D252C;
    color: #F5F2EC;
    padding: 10px 24px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 600;
    transition: background 0.2s ease-out, transform 0.2s ease-out;
}

.btn-back-home:hover {
    background: #2C353D;
    transform: translateY(-1px);
}

/* ===== 文末标签 ===== */
.article-tags {
    max-width: 720px;
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--color-paper-line);
    display: flex;
    align-items: center;
    gap: 12px;
}

.tags-label {
    font-size: 12px;
    color: var(--color-paper-muted);
    letter-spacing: 0.05em;
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag-item {
    font-size: 12px;
    color: #3E6B40;
    padding: 4px 12px;
    border-radius: 999px;
    background: rgba(139,226,140,0.1);
    border: 1px solid rgba(139,226,140,0.3);
    transition: background 0.2s, color 0.2s;
}

.tag-item:hover {
    background: rgba(139,226,140,0.2);
}

.article-footer-link {
    max-width: 720px;
    margin-top: 16px;
    text-align: right;
}

.article-footer-link a {
    font-size: 14px;
    color: #3E6B40;
    font-weight: 600;
    transition: color 0.2s;
}

.article-footer-link a:hover {
    color: #2C4F2E;
}

.article-footer-link .arrow {
    display: inline-block;
    margin-left: 4px;
    transition: transform 0.2s;
}

.article-footer-link a:hover .arrow {
    transform: translateX(4px);
}

/* ===== 相关推荐 ===== */
.related-section {
    background: var(--color-paper);
    padding: 0 0 80px;
}

.related-inner {
    max-width: 920px;
    margin: 0 auto;
    padding: 0 24px;
}

.related-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 28px;
    border-top: 1px solid var(--color-paper-line);
    padding-top: 40px;
}

.related-header h2 {
    font-size: 1.3rem;
    font-weight: 700;
    color: #161C22;
}

.related-header a {
    font-size: 13px;
    color: #3E6B40;
    transition: color 0.2s;
}

.related-header a:hover {
    color: #2C4F2E;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.related-card {
    background: #FFFFFF;
    border: 1px solid var(--color-paper-line);
    border-radius: var(--radius);
    overflow: hidden;
    transition: border-color 0.2s ease-out, transform 0.2s ease-out;
}

.related-card:hover {
    border-color: #9FBF9F;
    transform: translateY(-2px);
}

.related-card-img {
    width: 100%;
    height: 132px;
    object-fit: cover;
    display: block;
    background: var(--color-code-bg);
}

.related-card-body {
    padding: 16px 18px 20px;
}

.related-card-body h3 {
    font-size: 15px;
    font-weight: 600;
    color: #1D252C;
    line-height: 1.45;
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.related-card-body p {
    font-size: 13px;
    color: var(--color-paper-muted);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 12px;
}

.related-card-meta {
    font-size: 12px;
    color: #B4ADA0;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ===== 页脚 ===== */
.site-footer {
    background: var(--color-bg);
    border-top: 1px solid rgba(255,255,255,0.06);
    padding: 64px 0 28px;
}

.footer-top {
    display: flex;
    justify-content: space-between;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.footer-brand {
    max-width: 380px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}

.footer-logo .logo-text {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--color-ink-text);
}

.footer-brand p {
    font-size: 13px;
    color: var(--color-muted);
    line-height: 1.7;
    margin: 0;
}

.footer-cols {
    display: flex;
    gap: 32px;
    align-items: flex-start;
    padding-top: 6px;
}

.footer-cols a {
    font-size: 14px;
    color: var(--color-muted);
    transition: color 0.2s;
}

.footer-cols a:hover {
    color: var(--color-mint);
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    padding-top: 28px;
}

.footer-copyright {
    font-size: 13px;
    color: var(--color-muted);
}

.footer-bottom p:not(.footer-copyright) {
    font-size: 12px;
    color: var(--color-dim);
}

.back-top {
    font-size: 13px;
    color: var(--color-muted);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: color 0.2s;
}

.back-top:hover {
    color: var(--color-mint);
}

.back-top .arrow-up {
    font-size: 15px;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .related-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-top {
        flex-direction: column;
        gap: 24px;
    }
}

@media (max-width: 768px) {
    .brand-row {
        padding: 12px 0 10px;
    }

    .header-search {
        flex: 0 1 auto;
    }

    .channel-nav {
        display: none;
    }

    .menu-btn {
        display: flex;
    }

    .article-body-wrap {
        padding: 32px 0 56px;
    }

    .breadcrumb {
        margin-bottom: 24px;
        font-size: 12px;
    }

    .article-title {
        font-size: 1.6rem;
    }

    .article-meta {
        font-size: 12px;
    }

    .article-content {
        font-size: 15px;
        line-height: 1.8;
    }

    .related-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .related-card {
        display: flex;
        gap: 0;
        align-items: stretch;
        border: 1px solid var(--color-paper-line);
    }

    .related-card-img {
        width: 120px;
        height: auto;
        min-height: 100%;
        object-fit: cover;
        flex-shrink: 0;
    }

    .related-card-body {
        padding: 12px 14px;
    }

    .related-card-body h3 {
        font-size: 14px;
        -webkit-line-clamp: 2;
    }

    .related-card-body p {
        display: none;
    }

    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .header-search {
        display: none;
    }

    .brand-row {
        padding: 10px 0 8px;
    }

    .logo-text {
        font-size: 1rem;
    }

    .article-body-wrap {
        padding: 24px 0 40px;
    }

    .breadcrumb {
        overflow: hidden;
    }

    .breadcrumb .current {
        max-width: 140px;
    }

    .article-title {
        font-size: 1.4rem;
        line-height: 1.35;
    }

    .article-meta {
        gap: 6px;
    }

    .article-content {
        font-size: 14.5px;
    }

    .article-content blockquote {
        padding: 12px 16px;
        font-size: 0.98rem;
    }

    .article-tags {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .related-header {
        padding-top: 28px;
    }

    .related-card-img {
        width: 90px;
    }

    .related-card-body {
        padding: 10px 12px;
    }

    .related-card-body h3 {
        font-size: 13px;
        -webkit-line-clamp: 3;
    }

    .footer-top {
        gap: 16px;
    }

    .footer-cols {
        flex-wrap: wrap;
        gap: 16px;
    }
}

/* ===== 焦点可见性 ===== */
a:focus-visible,
button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--color-mint);
    outline-offset: 2px;
}

/* roulang page: category2 */
:root {
  --color-bg: #0B0F14;
  --color-panel: #111820;
  --color-line: rgba(255, 255, 255, 0.08);
  --color-mint: #8BE28C;
  --color-amber: #E5AC56;
  --color-text: #E4EAF0;
  --color-muted: #94A3B3;
  --paper-bg: #F5F2EC;
  --paper-ink: #1D252C;
  --paper-muted: #6B7680;
  --paper-line: #D8D2C6;
  --paper-mint: #2E7D3A;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-number: "SF Mono", "Roboto Mono", "Menlo", monospace;
  --radius: 4px;
  --space-section: 112px;
  --header-h: 120px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}
img {
  max-width: 100%;
  display: block;
}
a {
  color: var(--color-mint);
  text-decoration: none;
  transition: color 0.2s ease-out;
}
a:hover {
  color: #ABE8A8;
}
a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--color-mint);
  outline-offset: 2px;
}
ul,
ol {
  list-style: none;
}
button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}
input {
  font-family: inherit;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.mono {
  font-family: var(--font-number);
}
.text-link {
  color: var(--color-mint);
  font-size: 14px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap 0.2s ease-out;
}
.text-link:hover {
  gap: 8px;
  color: #ABE8A8;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  transition: all 0.2s ease-out;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--color-mint);
  color: #0B0F14;
}
.btn-primary:hover {
  background: #ABE8A8;
  color: #090D11;
  transform: translateY(-1px);
}
.btn-secondary {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.25);
  color: var(--color-text);
}
.btn-secondary:hover {
  border-color: var(--color-mint);
  color: var(--color-mint);
}
.btn-dark {
  background: transparent;
  border: 1px solid rgba(29, 37, 44, 0.3);
  color: var(--paper-ink);
}
.btn-dark:hover {
  border-color: var(--paper-mint);
  color: var(--paper-mint);
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 15, 20, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  transition: box-shadow 0.2s ease-out;
}
.site-header.scrolled {
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
}
.brand-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  transition: min-height 0.2s ease-out;
}
.site-header.scrolled .brand-row {
  min-height: 56px;
}
.brand-logo {
  display: inline-flex;
  align-items: center;
  position: relative;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--color-text);
}
.brand-logo:hover {
  color: var(--color-text);
}
.logo-dot {
  position: absolute;
  top: 1px;
  right: -8px;
  width: 6px;
  height: 6px;
  background: var(--color-mint);
  border-radius: 1px;
}
.header-tools {
  display: flex;
  align-items: center;
  gap: 16px;
}
.search-form {
  display: flex;
  align-items: center;
  border-bottom: 1px solid #334156;
  padding-bottom: 4px;
  transition: border-color 0.2s ease-out;
  min-width: 220px;
}
.search-form:focus-within {
  border-bottom-color: var(--color-mint);
}
.search-form input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--color-text);
  font-size: 14px;
  height: 32px;
  width: 100%;
}
.search-form input::placeholder {
  color: #738396;
}
.search-form button {
  color: var(--color-muted);
  display: inline-flex;
  padding: 4px;
  transition: color 0.2s ease-out;
}
.search-form button:hover {
  color: var(--color-mint);
}
.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.15);
}
.menu-toggle span {
  width: 18px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all 0.2s ease-out;
}
.menu-close-btn {
  display: none;
  position: absolute;
  top: 20px;
  right: 20px;
  width: 44px;
  height: 44px;
  font-size: 32px;
  color: var(--color-text);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  z-index: 210;
}
.menu-close-btn:hover {
  border-color: var(--color-mint);
  color: var(--color-mint);
}
.channel-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  min-height: 48px;
}
.channel-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.channel-nav .nav-link {
  display: inline-block;
  padding: 12px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-muted);
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease-out, border-color 0.2s ease-out;
}
.channel-nav .nav-link:hover {
  color: var(--color-mint);
}
.channel-nav .nav-link.active {
  color: var(--color-text);
  border-bottom-color: var(--color-mint);
}
.hot-keywords {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--color-muted);
}
.hot-keywords .hot-label {
  padding: 2px 8px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 999px;
  font-size: 11px;
  color: var(--color-muted);
}
.hot-keywords a {
  color: var(--color-muted);
  transition: color 0.2s ease-out;
}
.hot-keywords a::before {
  content: "#";
  color: var(--color-mint);
  margin-right: 2px;
}
.hot-keywords a:hover {
  color: var(--color-mint);
}

/* ===== Category Hero ===== */
.cat-hero {
  position: relative;
  background: var(--color-bg);
  padding: 88px 0 72px;
  min-height: 380px;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.cat-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url('/assets/images/backpic/back-1.png') no-repeat right center / cover;
  opacity: 0.35;
}
.cat-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(11, 15, 20, 0.94) 0%, rgba(11, 15, 20, 0.72) 45%, rgba(11, 15, 20, 0.28) 100%);
}
.cat-hero-content {
  position: relative;
  z-index: 2;
  max-width: 720px;
}
.cat-breadcrumb {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.cat-breadcrumb a {
  color: var(--color-muted);
  transition: color 0.2s ease-out;
}
.cat-breadcrumb a:hover {
  color: var(--color-mint);
}
.cat-hero-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-number);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--color-mint);
  margin-bottom: 16px;
  text-transform: uppercase;
}
.cat-hero-label::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--color-mint);
}
.cat-hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: 16px;
}
.cat-hero-desc {
  font-size: 15px;
  color: var(--color-muted);
  max-width: 520px;
  line-height: 1.8;
}

/* ===== Category Body ===== */
.cat-body {
  background: var(--paper-bg);
  color: var(--paper-ink);
  padding: 88px 0 104px;
}
.cat-grid {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 64px;
  align-items: start;
}
.cat-index {
  position: sticky;
  top: 150px;
}
.cat-index-label {
  font-family: var(--font-number);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--paper-muted);
  margin-bottom: 12px;
  display: block;
}
.cat-index-nav {
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--paper-line);
}
.cat-index-nav a {
  position: relative;
  padding: 10px 16px;
  font-size: 14px;
  color: var(--paper-muted);
  border-left: 2px solid transparent;
  transition: all 0.2s ease-out;
}
.cat-index-nav a:hover {
  color: var(--paper-mint);
  border-left-color: var(--color-mint);
  padding-left: 20px;
}
.cat-content {
  min-width: 0;
}
.cat-block {
  margin-bottom: 72px;
  scroll-margin-top: 150px;
}
.block-num {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-number);
  font-size: 12px;
  letter-spacing: 0.15em;
  color: var(--paper-mint);
  margin-bottom: 12px;
}
.block-num::after {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--paper-line);
}
.cat-block h2 {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper-ink);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}
.cat-block > p {
  color: #3A444C;
  font-size: 15px;
  margin-bottom: 20px;
  max-width: 680px;
}
.check-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 8px;
}
.check-list li {
  position: relative;
  padding-left: 28px;
  color: #3A444C;
  font-size: 14px;
  line-height: 1.7;
}
.check-list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 7px;
  width: 8px;
  height: 8px;
  background: var(--color-mint);
  border-radius: 1px;
}
.cat-figure {
  margin: 36px 0;
  border-radius: 8px;
  overflow: hidden;
  background: #EDE8DE;
  border: 1px solid var(--paper-line);
}
.cat-figure img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}
.cat-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--paper-muted);
  text-align: center;
  background: #EDE8DE;
  line-height: 1.6;
}

/* ===== Security Tip ===== */
.security-tip {
  display: flex;
  gap: 16px;
  background: #EEF3EA;
  border-radius: 6px;
  padding: 24px 28px;
  margin: 36px 0;
  border: 1px solid rgba(46, 125, 58, 0.15);
}
.tip-bar {
  flex-shrink: 0;
  width: 3px;
  border-radius: 2px;
  background: var(--color-mint);
}
.tip-content strong {
  display: block;
  font-size: 15px;
  color: var(--paper-ink);
  margin-bottom: 6px;
}
.tip-content p {
  font-size: 14px;
  color: #3A444C;
  line-height: 1.8;
}

/* ===== FAQ ===== */
.faq-list {
  border-top: 1px solid var(--paper-line);
  margin-top: 8px;
}
.faq-item {
  border-bottom: 1px solid var(--paper-line);
}
.faq-item summary {
  cursor: pointer;
  padding: 18px 36px 18px 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--paper-ink);
  list-style: none;
  position: relative;
  transition: color 0.2s ease-out;
}
.faq-item summary:hover {
  color: var(--paper-mint);
}
.faq-item summary::-webkit-details-marker {
  display: none;
}
.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  font-weight: 400;
  color: var(--paper-muted);
  transition: transform 0.2s ease-out, color 0.2s ease-out;
}
.faq-item[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
  color: var(--paper-mint);
}
.faq-item p {
  padding: 0 40px 20px 0;
  color: var(--paper-muted);
  font-size: 14px;
  line-height: 1.85;
}

/* ===== Final CTA ===== */
.final-cta {
  position: relative;
  background: var(--color-bg);
  padding: 96px 0;
  text-align: center;
  overflow: hidden;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.final-cta::before {
  content: "";
  position: absolute;
  width: 560px;
  height: 560px;
  border-radius: 50%;
  border: 1px solid rgba(139, 226, 140, 0.15);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.final-cta::after {
  content: "";
  position: absolute;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  border: 1px solid rgba(139, 226, 140, 0.09);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.cta-content {
  position: relative;
  z-index: 2;
}
.cta-content h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--color-text);
  margin-bottom: 12px;
}
.cta-content > p {
  color: var(--color-muted);
  font-size: 15px;
  margin-bottom: 36px;
}
.cta-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ===== Footer ===== */
.site-footer {
  background: #090D11;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 64px 0 32px;
}
.footer-top {
  display: flex;
  justify-content: space-between;
  gap: 48px;
  flex-wrap: wrap;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.footer-brand {
  max-width: 360px;
}
.footer-logo {
  margin-bottom: 12px;
}
.footer-brand .logo-text {
  font-size: 18px;
  font-weight: 800;
  color: var(--color-text);
}
.footer-brand p {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.7;
}
.footer-cols {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 140px;
}
.footer-cols a {
  font-size: 14px;
  color: var(--color-muted);
  transition: color 0.2s ease-out, padding-left 0.2s ease-out;
}
.footer-cols a:hover {
  color: var(--color-mint);
  padding-left: 4px;
}
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 24px;
  flex-wrap: wrap;
}
.footer-copyright {
  font-size: 13px;
  color: var(--color-muted);
}
.footer-bottom p:not(.footer-copyright) {
  font-size: 12px;
  color: #5A6A78;
}
.back-top {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--color-muted);
  transition: color 0.2s ease-out;
}
.back-top:hover {
  color: var(--color-mint);
}
.back-top .arrow-up {
  font-size: 16px;
  transition: transform 0.2s ease-out;
}
.back-top:hover .arrow-up {
  transform: translateY(-3px);
}

/* ===== Mobile Menu Overlay ===== */
@media (max-width: 768px) {
  .menu-toggle {
    display: inline-flex;
  }
  .menu-close-btn {
    display: flex;
  }
  .search-form {
    display: none;
  }
  .site-header.menu-open .channel-row {
    display: flex;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 205;
    background: #0B0F14;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border: none;
    padding: 48px 24px;
    gap: 12px;
  }
  .channel-nav {
    flex-direction: column;
    align-items: center;
    gap: 4px;
  }
  .channel-nav .nav-link {
    font-size: 1.4rem;
    line-height: 2.2;
    padding: 8px 20px;
    border-bottom: none;
    color: var(--color-text);
  }
  .channel-nav .nav-link.active {
    color: var(--color-mint);
    border-bottom: none;
  }
  .channel-nav .nav-link::after {
    display: block;
    content: "";
    width: 0;
    height: 2px;
    background: var(--color-mint);
    margin: 2px auto 0;
    transition: width 0.2s ease-out;
  }
  .channel-nav .nav-link.active::after {
    width: 20px;
  }
  .hot-keywords {
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin-top: 20px;
    font-size: 13px;
  }
}

/* ===== Responsive: Tablet & Mobile ===== */
@media (max-width: 1024px) {
  .cat-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .cat-index {
    position: static;
  }
  .cat-index-nav {
    flex-direction: row;
    border-left: none;
    border-bottom: 1px solid var(--paper-line);
    overflow-x: auto;
    padding-bottom: 4px;
    -webkit-overflow-scrolling: touch;
  }
  .cat-index-nav a {
    padding: 8px 14px;
    white-space: nowrap;
    border-left: none;
    border-bottom: 2px solid transparent;
  }
  .cat-index-nav a:hover {
    padding-left: 14px;
    border-bottom-color: var(--color-mint);
  }
  .hot-keywords {
    display: none;
  }
}

@media (max-width: 768px) {
  .cat-hero {
    padding: 64px 0 56px;
    min-height: 320px;
  }
  .cat-body {
    padding: 64px 0 80px;
  }
  .cat-block {
    margin-bottom: 56px;
  }
  .cat-block h2 {
    font-size: 1.5rem;
  }
  .final-cta {
    padding: 72px 0;
  }
  .footer-top {
    flex-direction: column;
    gap: 32px;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
}

@media (max-width: 520px) {
  .container {
    padding: 0 20px;
  }
  .brand-logo {
    font-size: 16px;
  }
  .logo-dot {
    width: 5px;
    height: 5px;
  }
  .cat-hero h1 {
    font-size: 2rem;
  }
  .cat-hero-desc {
    font-size: 14px;
  }
  .security-tip {
    flex-direction: column;
    padding: 20px;
  }
  .tip-bar {
    width: 100%;
    height: 3px;
  }
  .check-list li {
    font-size: 13px;
    padding-left: 24px;
  }
  .cta-buttons {
    flex-direction: column;
    width: 100%;
  }
  .cta-buttons .btn {
    width: 100%;
  }
}