/* roulang page: index */
:root {
  --bg-primary: #0B0E13;
  --bg-secondary: #131820;
  --bg-card: #182028;
  --bg-dark: #0D1117;
  --primary: #D4A94E;
  --primary-hover: #F0C468;
  --accent: #D07A4F;
  --text-main: #EDEAE3;
  --text-weak: #A9A29A;
  --border-main: rgba(212, 169, 78, .28);
  --radius-card: 14px;
  --radius-btn: 8px;
  --shadow-deep: 0 12px 40px rgba(0, 0, 0, .45);
  --shadow-light: 0 4px 20px rgba(0, 0, 0, .25);
  --transition: all .25s ease;
  --font-serif: 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
  --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
h1, h2, h3, h4 { font-family: var(--font-serif); line-height: 1.3; }
ul, ol { list-style: none; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* Container */
.container { width: 100%; max-width: 1280px; margin: 0 auto; padding: 0 48px; }
.container-fluid { width: 100%; padding: 0 48px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 13px 30px; border-radius: var(--radius-btn);
  font-size: .95rem; font-weight: 500; letter-spacing: .04em;
  transition: var(--transition); border: 1px solid transparent;
  line-height: 1.4; justify-content: center;
}
.btn-primary {
  background: var(--primary); color: #0B0E13; border-color: var(--primary);
}
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); transform: translateY(-2px); box-shadow: 0 10px 30px rgba(212, 169, 78, .22); }
.btn-primary:active { transform: translateY(0); }
.btn-ghost {
  background: transparent; color: var(--text-main); border: 1px solid var(--border-main);
}
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); background: rgba(212, 169, 78, .06); transform: translateY(-2px); }
.btn-ghost:active { transform: translateY(0); }
.btn-lg { padding: 16px 40px; font-size: 1rem; }

/* Tags & badges */
.badge {
  display: inline-block; padding: 4px 14px; border-radius: 20px;
  font-size: .78rem; letter-spacing: .05em; line-height: 1.5;
  border: 1px solid var(--border-main); color: var(--primary);
  background: rgba(212, 169, 78, .08);
}
.badge-accent { color: var(--accent); border-color: rgba(208, 122, 79, .35); background: rgba(208, 122, 79, .08); }

/* Section label */
.section-label {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: .82rem; letter-spacing: .18em; color: var(--primary);
  text-transform: uppercase; margin-bottom: 16px;
}
.section-label::before {
  content: ''; width: 32px; height: 1px; background: var(--primary);
}

/* ===== Side Navigation (Desktop) ===== */
.side-nav {
  position: fixed; left: 0; top: 0; width: 280px; height: 100vh;
  background: var(--bg-dark); border-right: 1px solid var(--border-main);
  z-index: 100; display: flex; flex-direction: column;
  padding: 32px 24px;
}
.brand { display: flex; align-items: center; margin-bottom: 44px; }
.brand-link { display: flex; align-items: center; gap: 14px; }
.brand-mark {
  width: 38px; height: 38px; border-radius: 8px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-serif); font-weight: 900; font-size: 16px;
  color: #0B0E13; flex-shrink: 0;
}
.brand-text { font-family: var(--font-serif); font-weight: 700; font-size: 1.28rem; letter-spacing: .05em; line-height: 1.3; }
.nav-menu { flex: 1; display: flex; flex-direction: column; gap: 6px; }
.nav-section {
  font-size: .74rem; letter-spacing: .15em; color: var(--text-weak);
  text-transform: uppercase; margin: 22px 0 8px;
}
.nav-item {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px; border-radius: 10px;
  font-size: .94rem; color: var(--text-weak);
  transition: var(--transition); position: relative;
  border-left: 2px solid transparent;
}
.nav-item i { width: 18px; text-align: center; font-size: .95rem; }
.nav-item:hover { background: rgba(212, 169, 78, .07); color: var(--text-main); border-left-color: var(--primary); }
.nav-item.active { background: rgba(212, 169, 78, .1); color: var(--primary); border-left-color: var(--primary); font-weight: 500; }
.nav-anchor { padding: 10px 16px 10px 42px; font-size: .9rem; }
.nav-footer { padding-top: 20px; border-top: 1px solid rgba(255, 255, 255, .06); }
.nav-footer p { font-size: .78rem; color: var(--text-weak); }

/* ===== Mobile Header ===== */
.mobile-header {
  display: none; position: fixed; top: 0; left: 0; right: 0; height: 58px;
  background: var(--bg-dark); border-bottom: 1px solid var(--border-main);
  z-index: 200; align-items: center; justify-content: space-between;
  padding: 0 20px;
}
.mobile-brand { font-family: var(--font-serif); font-weight: 700; font-size: 1.1rem; color: var(--primary); }
.hamburger { width: 42px; height: 42px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 5px; border-radius: 8px; }
.hamburger span { width: 22px; height: 2px; background: var(--text-main); border-radius: 2px; transition: var(--transition); }
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.mobile-menu {
  display: none; position: fixed; top: 58px; left: 0; right: 0;
  background: var(--bg-dark); border-bottom: 1px solid var(--border-main);
  z-index: 190; padding: 12px 20px 20px; flex-direction: column;
}
.mobile-menu.show { display: flex; }
.mobile-menu-item {
  padding: 14px 12px; font-size: 1.05rem; color: var(--text-main);
  border-bottom: 1px solid rgba(255, 255, 255, .05); transition: var(--transition);
}
.mobile-menu-item:last-child { border-bottom: none; }
.mobile-menu-item.active { color: var(--primary); font-weight: 500; }
.mobile-menu-item:hover { color: var(--primary); background: rgba(212, 169, 78, .04); }

/* ===== Main layout ===== */
.main-content { margin-left: 280px; }
.site-footer { margin-left: 280px; }

/* ===== Hero ===== */
.hero {
  position: relative; min-height: 78vh; display: flex; align-items: center;
  background: var(--bg-primary); overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; background-size: cover; background-position: center;
  z-index: 0;
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(11, 14, 19, .55) 0%, var(--bg-primary) 94%);
  z-index: 1;
}
.hero-inner {
  position: relative; z-index: 2; max-width: 780px; padding: 80px 0;
  margin-left: 48px;
}
.hero-tag {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .82rem; letter-spacing: .16em; color: var(--primary);
  border: 1px solid var(--border-main); border-radius: 30px;
  padding: 7px 18px; background: rgba(11, 14, 19, .6); margin-bottom: 28px;
  backdrop-filter: blur(4px);
}
.hero h1 {
  font-size: clamp(2.2rem, 4.5vw, 3.8rem);
  font-weight: 900; line-height: 1.2; margin-bottom: 22px;
  color: var(--text-main); text-shadow: 0 4px 30px rgba(0, 0, 0, .5);
}
.hero h1 .accent-text { color: var(--primary); }
.hero-desc {
  font-size: 1.02rem; color: var(--text-weak); max-width: 600px;
  margin-bottom: 32px; line-height: 1.9;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 46px; }
.hero-stats {
  display: flex; gap: 40px; flex-wrap: wrap;
  border-top: 1px solid rgba(255, 255, 255, .08); padding-top: 30px;
}
.hero-stat strong {
  display: block; font-family: var(--font-serif); font-size: 1.8rem;
  font-weight: 900; color: var(--primary); line-height: 1.2;
}
.hero-stat span { font-size: .84rem; color: var(--text-weak); }

/* ===== Section base ===== */
.section { padding: 88px 0; }
.section-alt { background: var(--bg-secondary); }
.section-head { margin-bottom: 52px; }
.section-head h2 {
  font-size: clamp(1.8rem, 3vw, 2.5rem); font-weight: 900;
  margin-bottom: 14px;
}
.section-head p { color: var(--text-weak); max-width: 640px; font-size: .98rem; }

/* ===== Pain Section ===== */
.pain-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 24px; margin-top: 40px;
}
.pain-card {
  background: var(--bg-card); border-radius: var(--radius-card);
  padding: 36px 28px 32px; border: 1px solid rgba(255, 255, 255, .04);
  transition: var(--transition); position: relative;
  border-left: 2px solid var(--primary); overflow: hidden;
}
.pain-card::before {
  content: ''; position: absolute; bottom: 0; left: 24px; right: 24px;
  height: 1px; background: linear-gradient(90deg, var(--primary), transparent);
}
.pain-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-deep); border-color: rgba(212, 169, 78, .2); }
.pain-num {
  font-family: var(--font-serif); font-size: 2.6rem; font-weight: 900;
  color: var(--primary); opacity: .6; line-height: 1; margin-bottom: 16px;
  display: block;
}
.pain-card h3 { font-size: 1.15rem; margin-bottom: 10px; }
.pain-card p { font-size: .9rem; color: var(--text-weak); line-height: 1.8; }

/* ===== Solution Section ===== */
.solution-wrapper {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}
.solution-image {
  position: relative; border-radius: var(--radius-card);
  overflow: hidden; border: 1px solid var(--border-main);
  min-height: 380px;
}
.solution-image img { width: 100%; height: 100%; object-fit: cover; }
.solution-image::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(11, 14, 19, .1), rgba(11, 14, 19, .6));
}
.solution-aside-tag {
  position: absolute; top: 20px; right: 20px; z-index: 2;
  writing-mode: vertical-rl; font-size: .78rem; letter-spacing: .3em;
  color: var(--primary); background: rgba(11, 14, 19, .7);
  padding: 14px 8px; border-radius: 8px; border: 1px solid var(--border-main);
  backdrop-filter: blur(4px);
}
.solution-list { display: flex; flex-direction: column; gap: 24px; }
.solution-item {
  display: flex; gap: 18px; align-items: flex-start;
  padding: 22px 20px; background: var(--bg-card);
  border-radius: var(--radius-card); border: 1px solid rgba(255, 255, 255, .03);
  transition: var(--transition);
}
.solution-item:hover { border-color: var(--border-main); background: #1D2730; }
.solution-num {
  font-family: var(--font-serif); font-size: 1.15rem; font-weight: 900;
  color: var(--accent); min-width: 34px;
}
.solution-body h4 { font-size: 1.02rem; margin-bottom: 6px; }
.solution-body p { font-size: .88rem; color: var(--text-weak); line-height: 1.8; }
.solution-tag {
  display: inline-block; font-size: .72rem; color: var(--primary);
  border: 1px solid var(--border-main); border-radius: 4px;
  padding: 2px 8px; margin-bottom: 8px; letter-spacing: .06em;
}

/* ===== Result Section ===== */
.result-strip {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 0;
  border: 1px solid rgba(255, 255, 255, .06); border-radius: var(--radius-card);
  background: var(--bg-card); padding: 0;
}
.result-item {
  padding: 52px 32px; text-align: center; position: relative;
}
.result-item + .result-item { border-left: 1px solid rgba(255, 255, 255, .06); }
.result-item strong {
  display: block; font-family: var(--font-serif); font-size: clamp(2.4rem, 4vw, 3.2rem);
  font-weight: 900; color: var(--primary); line-height: 1.15; margin-bottom: 18px;
}
.result-item strong .unit { font-size: .5em; color: var(--accent); }
.result-item span {
  display: block; font-size: .86rem; color: var(--text-weak);
  padding-top: 16px; border-top: 1px solid rgba(212, 169, 78, .2);
}

/* ===== Latest Posts ===== */
.post-list { display: flex; flex-direction: column; gap: 16px; }
.post-card {
  display: grid; grid-template-columns: 1fr auto; gap: 24px;
  background: var(--bg-card); border-radius: var(--radius-card);
  padding: 26px 30px; border: 1px solid rgba(255, 255, 255, .04);
  transition: var(--transition); position: relative; overflow: hidden;
  align-items: center;
}
.post-card::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: var(--primary); opacity: 0; transition: var(--transition);
}
.post-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-light); border-color: rgba(212, 169, 78, .25); }
.post-card:hover::before { opacity: 1; }
.post-thumb {
  display: none; width: 140px; height: 90px; border-radius: 8px;
  overflow: hidden; position: relative;
}
.post-main h3 {
  font-size: 1.12rem; font-weight: 700; margin-bottom: 6px;
  color: var(--text-main); transition: var(--transition);
  font-family: var(--font-serif);
}
.post-card:hover .post-main h3 { color: var(--primary); }
.post-main p { font-size: .9rem; color: var(--text-weak); line-height: 1.75; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.post-side { display: flex; flex-direction: column; align-items: flex-end; gap: 10px; min-width: 130px; }
.post-date { font-size: .8rem; color: var(--text-weak); font-family: var(--font-serif); }
.post-cat { font-size: .78rem; color: var(--accent); border: 1px solid rgba(208, 122, 79, .3); padding: 2px 10px; border-radius: 16px; }
.post-arrow { color: var(--primary); font-size: 1.1rem; opacity: .8; transition: var(--transition); }
.post-card:hover .post-arrow { transform: translateX(4px); opacity: 1; }
.empty-state {
  border: 2px dashed rgba(212, 169, 78, .3); border-radius: var(--radius-card);
  padding: 60px 30px; text-align: center; color: var(--text-weak);
}
.empty-icon { font-size: 2.4rem; color: var(--primary); opacity: .4; display: block; margin-bottom: 14px; }
.empty-state p { font-size: .98rem; }
.more-link {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--primary); font-size: .92rem; margin-top: 28px;
  transition: var(--transition);
}
.more-link:hover { color: var(--primary-hover); gap: 12px; }

/* ===== Topic Grid ===== */
.topic-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.topic-card {
  background: var(--bg-card); border-radius: var(--radius-card);
  padding: 32px 26px; border: 1px solid rgba(255, 255, 255, .04);
  transition: var(--transition); position: relative;
}
.topic-card::after {
  content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%);
  width: 0; height: 2px; background: var(--primary); transition: var(--transition);
}
.topic-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-deep); }
.topic-card:hover::after { width: 60%; }
.topic-icon {
  width: 48px; height: 48px; border-radius: 12px;
  background: rgba(212, 169, 78, .1); border: 1px solid var(--border-main);
  display: flex; align-items: center; justify-content: center;
  color: var(--primary); font-size: 1.25rem; margin-bottom: 18px;
}
.topic-card h3 { font-size: 1.06rem; margin-bottom: 8px; font-weight: 700; }
.topic-card p { font-size: .86rem; color: var(--text-weak); line-height: 1.75; }

/* ===== Testimonials ===== */
.testimonial-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.testimonial-card {
  background: var(--bg-card); border-radius: var(--radius-card);
  padding: 30px 26px; border: 1px solid rgba(212, 169, 78, .12);
  position: relative; transition: var(--transition);
}
.testimonial-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-light); border-color: rgba(212, 169, 78, .3); }
.testimonial-card::before {
  content: '\201C'; position: absolute; top: 8px; left: 16px;
  font-size: 4rem; font-family: Georgia, serif; color: var(--primary);
  opacity: .25; line-height: 1;
}
.testimonial-card .quote {
  font-size: .92rem; color: var(--text-main); line-height: 1.9;
  margin-bottom: 22px; position: relative; z-index: 1;
}
.testimonial-user { display: flex; align-items: center; gap: 12px; border-top: 1px solid rgba(255, 255, 255, .05); padding-top: 16px; }
.testimonial-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: linear-gradient(135deg, var(--bg-card), #24303a);
  border: 1px solid var(--border-main);
  display: flex; align-items: center; justify-content: center;
  font-size: .95rem; color: var(--primary); font-weight: 700;
  flex-shrink: 0;
}
.testimonial-user-name { font-size: .9rem; font-weight: 500; }
.testimonial-user-tag { font-size: .76rem; color: var(--text-weak); }

/* ===== FAQ ===== */
.faq-list { max-width: 820px; }
.faq-item {
  background: var(--bg-card); border-radius: var(--radius-card);
  border: 1px solid rgba(255, 255, 255, .04);
  margin-bottom: 14px; transition: var(--transition);
  overflow: hidden;
}
.faq-item.active { border-color: rgba(212, 169, 78, .3); background: #1B242D; }
.faq-item.active::before {
  content: ''; display: block; height: 100%; width: 3px;
  background: var(--primary); position: absolute; left: 0; top: 0;
}
.faq-item .faq-q {
  display: flex; justify-content: space-between; align-items: center;
  padding: 22px 28px; font-size: 1rem; font-weight: 500;
  cursor: pointer; transition: var(--transition);
  position: relative;
}
.faq-item .faq-q:hover { color: var(--primary); }
.faq-item .faq-q .icon {
  width: 32px; height: 32px; border-radius: 50%;
  border: 1px solid var(--border-main); display: flex;
  align-items: center; justify-content: center;
  transition: var(--transition); flex-shrink: 0; font-size: .85rem;
}
.faq-item.active .faq-q .icon { transform: rotate(45deg); border-color: var(--primary); color: var(--primary); }
.faq-item .faq-a {
  max-height: 0; overflow: hidden; transition: max-height .3s ease;
  padding: 0 28px;
}
.faq-item.active .faq-a { max-height: 400px; padding-bottom: 24px; }
.faq-item .faq-a p {
  font-size: .92rem; color: var(--text-weak); line-height: 1.9;
  border-top: 1px solid rgba(255, 255, 255, .05); padding-top: 18px;
}

/* ===== CTA ===== */
.cta-section {
  position: relative; padding: 120px 0; overflow: hidden;
  background: var(--bg-primary);
}
.cta-bg {
  position: absolute; inset: 0; background-size: cover; background-position: center;
  opacity: .3;
}
.cta-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, var(--bg-primary) 0%, rgba(11, 14, 19, .75) 45%, var(--bg-primary) 100%);
}
.cta-inner {
  position: relative; z-index: 2; text-align: center; max-width: 700px;
  margin: 0 auto; padding: 0 24px;
}
.cta-inner h2 {
  font-size: clamp(1.9rem, 3.5vw, 2.8rem); font-weight: 900;
  margin-bottom: 18px;
}
.cta-inner p { color: var(--text-weak); font-size: 1rem; margin-bottom: 36px; line-height: 1.85; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-dark); border-top: 1px solid var(--border-main);
  padding: 64px 0 0;
}
.footer-brand {
  font-family: var(--font-serif); font-size: 2.4rem; font-weight: 900;
  text-align: center; margin-bottom: 8px; color: var(--text-main);
}
.footer-slogan { text-align: center; color: var(--text-weak); font-size: .9rem; margin-bottom: 48px; }
.footer-grid {
  display: grid; grid-template-columns: 1fr 1.5fr 1fr; gap: 48px;
  max-width: 1200px; margin: 0 auto; padding: 0 48px 48px;
}
.footer-col h4 {
  font-size: .88rem; letter-spacing: .1em; color: var(--primary);
  text-transform: uppercase; margin-bottom: 18px;
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a { color: var(--text-weak); font-size: .9rem; transition: var(--transition); }
.footer-col ul li a:hover { color: var(--primary); }
.footer-desc { color: var(--text-weak); font-size: .88rem; line-height: 1.8; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .06);
  padding: 20px 0; text-align: center; font-size: .82rem; color: var(--text-weak);
  background: #090C10;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .side-nav { transform: translateX(-100%); transition: transform .25s ease; }
  .side-nav.show { transform: translateX(0); }
  .mobile-header { display: flex; }
  .main-content { margin-left: 0; }
  .site-footer { margin-left: 0; }
  .container-fluid { padding: 0 28px; }
  .container { padding: 0 28px; }
  .pain-grid { grid-template-columns: repeat(2, 1fr); }
  .solution-wrapper { grid-template-columns: 1fr; gap: 40px; }
  .topic-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonial-grid { grid-template-columns: repeat(2, 1fr); }
  .result-strip { grid-template-columns: repeat(2, 1fr); }
  .result-item + .result-item { border-left: none; border-top: 1px solid rgba(255, 255, 255, .06); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 767px) {
  body { padding-top: 58px; }
  .section { padding: 56px 0; }
  .container-fluid { padding: 0 20px; }
  .container { padding: 0 20px; }
  .hero { min-height: auto; }
  .hero-inner { margin-left: 0; padding: 56px 20px; }
  .hero h1 { font-size: clamp(1.8rem, 5.5vw, 2.4rem); }
  .hero-desc { font-size: .94rem; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; }
  .hero-stats { gap: 20px; }
  .hero-stat strong { font-size: 1.4rem; }
  .pain-grid { grid-template-columns: 1fr; }
  .topic-grid { grid-template-columns: 1fr; }
  .testimonial-grid { grid-template-columns: 1fr; }
  .result-strip { grid-template-columns: 1fr; }
  .post-card { grid-template-columns: 1fr; padding: 20px; }
  .post-side { flex-direction: row; align-items: center; justify-content: space-between; min-width: 0; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; padding: 0 24px 40px; }
  .footer-brand { font-size: 1.8rem; }
}
@media (max-width: 520px) {
  .hero-tag { font-size: .74rem; padding: 5px 12px; }
  .btn { padding: 12px 20px; font-size: .9rem; }
  .solution-image { min-height: 220px; }
  .section-head h2 { font-size: 1.5rem; }
  .theme-switch { right: 20px; }
}

/* roulang page: article */
:root {
  --bg: #0B0E13;
  --bg-alt: #131820;
  --bg-card: #182028;
  --primary: #D4A94E;
  --primary-hover: #F0C468;
  --accent: #D07A4F;
  --text: #EDEAE3;
  --text-muted: #A9A29A;
  --border: rgba(212,169,78,.28);
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 24px 48px rgba(0,0,0,.5);
  --font-serif: "Noto Serif SC","Songti SC","SimSun",serif;
  --font-sans: "Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --sidebar-w: 280px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color .25s ease, border-color .25s ease, background .25s ease, transform .25s ease, box-shadow .25s ease;
}

a:hover {
  color: var(--primary);
}

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

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

ul, ol {
  list-style: none;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ==== Sidebar ==== */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  background: #0D1117;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 1000;
  transition: transform .3s ease;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 28px 24px 20px;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 900;
  letter-spacing: .06em;
  color: var(--text);
  border-bottom: 1px solid rgba(212,169,78,.15);
  position: relative;
}

.brand-mark {
  width: 12px;
  height: 12px;
  background: var(--primary);
  display: inline-block;
  transform: rotate(45deg);
  box-shadow: 0 0 16px rgba(212,169,78,.7);
}

.nav-menu {
  flex: 1;
  padding: 20px 0;
  overflow-y: auto;
}

.nav-section {
  padding: 20px 28px 10px;
  font-size: .75rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--text-muted);
  opacity: .6;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 28px;
  font-size: .95rem;
  font-weight: 500;
  color: var(--text-muted);
  border-left: 3px solid transparent;
  transition: all .25s ease;
}

.nav-item i {
  width: 20px;
  text-align: center;
  color: var(--primary);
  opacity: .7;
}

.nav-item:hover {
  color: var(--text);
  background: rgba(212,169,78,.06);
}

.nav-item.active {
  color: var(--primary);
  border-left-color: var(--primary);
  background: linear-gradient(90deg, rgba(212,169,78,.12), transparent);
}

.nav-item.active i {
  opacity: 1;
}

.sidebar-foot {
  padding: 20px 24px 24px;
  font-size: .75rem;
  color: var(--text-muted);
  opacity: .5;
  border-top: 1px solid rgba(212,169,78,.1);
}

/* ==== Mobile Header ==== */
.mobile-header {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: rgba(11,14,19,.96);
  border-bottom: 1px solid var(--border);
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  z-index: 1100;
  backdrop-filter: blur(8px);
}

.mobile-brand {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 900;
  letter-spacing: .04em;
}

.menu-toggle {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: var(--primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all .25s ease;
}

.menu-toggle:hover {
  background: rgba(212,169,78,.1);
}

.menu-toggle:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.menu-mask {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.6);
  z-index: 1050;
  backdrop-filter: blur(2px);
}

.menu-mask.show {
  display: block;
}

/* ==== Main Wrapper ==== */
.main-wrapper {
  margin-left: var(--sidebar-w);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page-main {
  flex: 1;
}

/* ==== Article Hero ==== */
.article-hero {
  position: relative;
  padding: 72px 0 56px;
  background: var(--bg);
  overflow: hidden;
}

.article-hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: .32;
}

.article-hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11,14,19,.72), #0B0E13 92%);
}

.article-hero-inner {
  position: relative;
  z-index: 1;
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: .82rem;
  color: var(--text-muted);
  margin-bottom: 28px;
}

.breadcrumb a {
  color: var(--text-muted);
}

.breadcrumb a:hover {
  color: var(--primary);
}

.bc-sep {
  color: var(--primary);
  opacity: .5;
}

.bc-now {
  color: var(--primary);
  max-width: 420px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.cat-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(212,169,78,.12);
  border: 1px solid var(--border);
  color: var(--primary);
  font-size: .8rem;
  letter-spacing: .1em;
  border-radius: 100px;
  margin-bottom: 18px;
}

.article-title {
  font-family: var(--font-serif);
  font-size: clamp(1.7rem, 4vw, 2.8rem);
  font-weight: 900;
  line-height: 1.25;
  color: var(--text);
  max-width: 900px;
  text-shadow: 0 2px 24px rgba(0,0,0,.5);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid rgba(212,169,78,.12);
}

.meta-item {
  font-size: .85rem;
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.meta-item i {
  color: var(--primary);
  opacity: .85;
}

/* ==== Article Body ==== */
.article-section {
  padding: 56px 0 72px;
}

.article-card {
  max-width: 860px;
  margin: 0 auto;
  background: var(--bg-alt);
  border: 1px solid rgba(212,169,78,.14);
  border-radius: var(--radius);
  padding: 48px 56px;
  box-shadow: var(--shadow);
}

.article-body {
  font-size: 17px;
  line-height: 1.9;
  color: var(--text);
}

.article-body > p:first-of-type {
  font-weight: 500;
  color: var(--text);
  font-size: 1.05em;
}

.article-body p {
  margin-bottom: 1.5rem;
  color: #D8D3CB;
}

.article-body h2 {
  font-family: var(--font-serif);
  font-size: 1.7rem;
  font-weight: 700;
  margin: 2.4rem 0 1.1rem;
  padding-left: 16px;
  border-left: 4px solid var(--primary);
  line-height: 1.35;
}

.article-body h3 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  margin: 2rem 0 .9rem;
  color: var(--primary-hover);
}

.article-body ul,
.article-body ol {
  margin: 0 0 1.6rem;
  padding-left: 0;
}

.article-body ul li {
  position: relative;
  padding-left: 28px;
  margin-bottom: .65rem;
  color: #D8D3CB;
}

.article-body ul li::before {
  content: "";
  position: absolute;
  left: 6px;
  top: .68em;
  width: 7px;
  height: 7px;
  background: var(--primary);
  transform: rotate(45deg);
}

.article-body ol {
  counter-reset: item;
}

.article-body ol li {
  position: relative;
  padding-left: 32px;
  margin-bottom: .65rem;
  color: #D8D3CB;
  counter-increment: item;
}

.article-body ol li::before {
  content: counter(item, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: .1em;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: .85rem;
  color: var(--primary);
}

.article-body blockquote {
  border-left: 4px solid var(--primary);
  background: rgba(212,169,78,.06);
  padding: 1.2rem 1.6rem;
  margin: 1.8rem 0;
  color: var(--text-muted);
  font-style: italic;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.article-body blockquote p {
  margin-bottom: 0;
  color: var(--text-muted);
}

.article-body img {
  border-radius: var(--radius);
  margin: 2rem auto;
  box-shadow: var(--shadow);
  border: 1px solid rgba(212,169,78,.15);
}

.article-body figcaption,
.article-body .caption {
  font-size: .82rem;
  color: var(--primary);
  text-align: center;
  margin-top: -1.4rem;
  margin-bottom: 1.8rem;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.8rem 0;
  font-size: .92rem;
}

.article-body table th {
  background: rgba(212,169,78,.12);
  color: var(--primary);
  font-weight: 600;
  text-align: left;
  padding: 12px 16px;
  border: 1px solid rgba(212,169,78,.2);
}

.article-body table td {
  padding: 11px 16px;
  border: 1px solid rgba(212,169,78,.12);
  color: #D8D3CB;
}

.article-body a {
  color: var(--primary);
  border-bottom: 1px solid transparent;
}

.article-body a:hover {
  border-bottom-color: var(--primary);
}

.article-body code {
  background: rgba(212,169,78,.08);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: .88em;
  color: var(--primary-hover);
}

.article-body pre {
  background: #0D1117;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px;
  overflow-x: auto;
  margin: 1.6rem 0;
}

.article-body pre code {
  background: none;
  padding: 0;
  color: var(--text);
}

/* ==== Tags ==== */
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid rgba(212,169,78,.14);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(212,169,78,.08);
  border: 1px solid rgba(212,169,78,.22);
  border-radius: 100px;
  font-size: .8rem;
  color: var(--primary);
  transition: all .25s ease;
}

.tag:hover {
  background: rgba(212,169,78,.18);
  transform: translateY(-1px);
}

/* ==== Article Nav ==== */
.article-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  margin-top: 40px;
  border-top: 1px solid rgba(212,169,78,.14);
  padding-top: 8px;
}

.article-nav a {
  display: block;
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  transition: all .25s ease;
}

.article-nav a:hover {
  background: rgba(212,169,78,.06);
}

.article-nav .an-prev {
  border-right: 1px solid rgba(212,169,78,.1);
}

.article-nav span {
  display: block;
  font-size: .78rem;
  color: var(--text-muted);
  letter-spacing: .08em;
  margin-bottom: 6px;
}

.article-nav p {
  font-size: .95rem;
  color: var(--text);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-nav a:hover p {
  color: var(--primary);
}

.an-next {
  text-align: right;
}

/* ==== Empty State ==== */
.article-empty {
  text-align: center;
  padding: 80px 20px;
}

.article-empty i {
  font-size: 3rem;
  color: var(--primary);
  opacity: .5;
  margin-bottom: 20px;
}

.article-empty p {
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-bottom: 28px;
}

/* ==== Buttons ==== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: .92rem;
  font-weight: 500;
  transition: all .28s ease;
  cursor: pointer;
  border: 1px solid transparent;
}

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

.btn-primary {
  background: var(--primary);
  color: #0B0E13;
}

.btn-primary:hover {
  background: var(--primary-hover);
  color: #0B0E13;
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(212,169,78,.3);
}

.btn-outline {
  border-color: var(--border);
  color: var(--primary);
  background: transparent;
}

.btn-outline:hover {
  background: var(--primary);
  color: #0B0E13;
  border-color: var(--primary);
  transform: translateY(-2px);
}

/* ==== Related ==== */
.related-section {
  background: var(--bg-alt);
  padding: 72px 0;
  border-top: 1px solid rgba(212,169,78,.1);
}

.section-heading {
  margin-bottom: 40px;
}

.eyebrow {
  display: inline-block;
  font-size: .78rem;
  letter-spacing: .18em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.section-heading h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--text);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.related-card {
  display: flex;
  gap: 18px;
  background: var(--bg-card);
  border: 1px solid rgba(212,169,78,.15);
  border-radius: var(--radius);
  padding: 18px;
  transition: all .3s ease;
}

.related-card:hover {
  border-color: var(--border);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.related-card:hover .related-info h3 {
  color: var(--primary);
}

.related-thumb {
  width: 140px;
  min-width: 140px;
  height: 100px;
  border-radius: 10px;
  overflow: hidden;
  background: var(--bg);
  border: 1px solid rgba(212,169,78,.12);
}

.related-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s ease;
}

.related-card:hover .related-thumb img {
  transform: scale(1.06);
}

.related-info {
  flex: 1;
  min-width: 0;
}

.related-date {
  font-size: .76rem;
  color: var(--text-muted);
  display: block;
  margin-bottom: 6px;
}

.related-info h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.5;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color .25s ease;
}

.related-info p {
  font-size: .84rem;
  color: var(--text-muted);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.related-more {
  text-align: center;
  margin-top: 44px;
}

/* ==== CTA ==== */
.cta-section {
  position: relative;
  padding: 96px 0;
  background: var(--bg);
  overflow: hidden;
}

.cta-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
}

.cta-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11,14,19,.82) 0%, rgba(11,14,19,.92) 100%);
}

.cta-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 680px;
  margin: 0 auto;
}

.cta-content .eyebrow {
  color: var(--primary);
}

.cta-content h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3.4vw, 2.6rem);
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 16px;
  color: var(--text);
}

.cta-content p {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 32px;
}

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

/* ==== Footer ==== */
.site-footer {
  background: var(--bg);
  border-top: 1px solid rgba(212,169,78,.15);
  padding: 60px 32px 0;
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 900;
  letter-spacing: .06em;
  text-align: center;
  color: var(--text);
  margin-bottom: 8px;
}

.footer-slogan {
  text-align: center;
  color: var(--text-muted);
  font-size: .9rem;
  margin-bottom: 40px;
}

.footer-grid {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1.6fr 1fr;
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(212,169,78,.1);
}

.footer-grid h4 {
  font-size: .85rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 16px;
  font-weight: 600;
}

.footer-grid ul li {
  margin-bottom: 10px;
}

.footer-grid ul li a {
  color: var(--text-muted);
  font-size: .9rem;
}

.footer-grid ul li a:hover {
  color: var(--primary);
}

.footer-desc {
  font-size: .88rem;
  color: var(--text-muted);
  line-height: 1.85;
}

.footer-bottom {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 0 30px;
  text-align: center;
  font-size: .8rem;
  color: rgba(169,162,154,.6);
}

/* ==== Responsive ==== */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
    box-shadow: none;
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: 0 0 60px rgba(0,0,0,.6);
  }

  .mobile-header {
    display: flex;
  }

  .main-wrapper {
    margin-left: 0;
    padding-top: 60px;
  }

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

@media (max-width: 768px) {
  .container {
    padding: 0 20px;
  }

  .article-card {
    padding: 32px 24px;
    border-radius: 12px;
  }

  .article-body {
    font-size: 16.5px;
    line-height: 1.85;
  }

  .article-meta {
    gap: 8px 16px;
  }

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

  .related-card {
    flex-direction: row;
  }

  .article-nav {
    grid-template-columns: 1fr;
  }

  .article-nav .an-prev {
    border-right: none;
    border-bottom: 1px solid rgba(212,169,78,.1);
  }

  .an-next {
    text-align: left;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }
}

@media (max-width: 520px) {
  .article-hero {
    padding: 48px 0 40px;
  }

  .article-title {
    font-size: 1.45rem;
    line-height: 1.35;
  }

  .article-card {
    padding: 24px 18px;
  }

  .article-body {
    font-size: 16px;
  }

  .related-thumb {
    width: 110px;
    min-width: 110px;
    height: 84px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .cta-section {
    padding: 64px 0;
  }

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

  .cta-buttons .btn {
    width: 100%;
    justify-content: center;
  }

  .bc-now {
    max-width: 160px;
  }
}