/* ==========================================================================
   加速啦 (jiasula.mom) — 主样式表
   纯原生 CSS，无框架，无外部依赖
   ========================================================================== */

:root {
  --bg-dark: #0b1120;
  --bg-dark-2: #121a33;
  --bg-dark-card: #17203f;
  --accent: #22d3ee;
  --accent-2: #8b5cf6;
  --accent-gradient: linear-gradient(135deg, #22d3ee 0%, #8b5cf6 100%);
  --text-light: #f8fafc;
  --text-light-muted: #a7b0c8;
  --bg-light: #f7f8fc;
  --bg-light-alt: #eef1ff;
  --card-bg: #ffffff;
  --border: #e4e7f2;
  --text-main: #1b2140;
  --text-muted: #5b6280;
  --success: #22c55e;
  --warning: #f59e0b;
  --radius-sm: 10px;
  --radius: 18px;
  --radius-lg: 26px;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 24px 60px rgba(15, 23, 42, 0.16);
  --max-width: 1180px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

section[id] {
  scroll-margin-top: 84px;
}

body {
  font-family: var(--font);
  color: var(--text-main);
  background: var(--bg-light);
  line-height: 1.6;
  font-size: 16px;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
}

h1,
h2,
h3,
h4 {
  line-height: 1.3;
  font-weight: 800;
}

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

.section-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--accent-2);
  background: var(--bg-light-alt);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 14px;
}

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 48px;
}

.section-head h2 {
  font-size: clamp(26px, 4vw, 36px);
  margin-bottom: 14px;
}

.section-head p {
  color: var(--text-muted);
  font-size: 17px;
}

/* ---------- Skip link (a11y) ---------- */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #05202a;
  padding: 12px 18px;
  z-index: 999;
  border-radius: 0 0 8px 0;
  font-weight: 700;
}

.skip-link:focus {
  left: 0;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 16px;
  min-height: 48px;
  border: 2px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease,
    border-color 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--accent-gradient);
  color: #051224;
  box-shadow: 0 12px 28px rgba(34, 211, 238, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 34px rgba(34, 211, 238, 0.45);
}

.btn-ghost {
  background: transparent;
  border-color: rgba(248, 250, 252, 0.35);
  color: var(--text-light);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

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

.btn-outline:hover {
  border-color: var(--accent-2);
  color: var(--accent-2);
}

.btn-block {
  width: 100%;
}

.btn-lg {
  padding: 18px 40px;
  font-size: 18px;
}

/* ==========================================================================
   Navbar
   ========================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 18px 0;
  background: transparent;
  transition: background 0.25s ease, box-shadow 0.25s ease, padding 0.25s ease;
}

.navbar.is-scrolled {
  background: rgba(11, 17, 32, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.25);
  padding: 12px 0;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 800;
  color: var(--text-light);
  flex-shrink: 0;
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.brand-logo svg {
  width: 20px;
  height: 20px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--text-light-muted);
  font-size: 15px;
  font-weight: 600;
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: var(--text-light);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.nav-actions .btn {
  padding: 10px 20px;
  font-size: 14px;
  min-height: 40px;
}

/* Mobile hamburger — pure CSS checkbox toggle, no JS required */
.menu-toggle {
  display: none;
}

.hamburger {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  border: 1px solid rgba(248, 250, 252, 0.25);
  flex-shrink: 0;
}

.hamburger span,
.hamburger span::before,
.hamburger span::after {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-light);
  position: relative;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.hamburger span::before {
  position: absolute;
  top: -6px;
}

.hamburger span::after {
  position: absolute;
  top: 6px;
}

.mobile-menu {
  display: none;
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  padding: 160px 0 110px;
  background: radial-gradient(ellipse 80% 60% at 20% -10%, rgba(139, 92, 246, 0.35), transparent),
    radial-gradient(ellipse 70% 60% at 90% 10%, rgba(34, 211, 238, 0.25), transparent),
    linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-dark-2) 100%);
  color: var(--text-light);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 26px 26px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black, transparent);
  pointer-events: none;
}

.hero .container {
  position: relative;
  text-align: center;
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(34, 211, 238, 0.12);
  border: 1px solid rgba(34, 211, 238, 0.35);
  color: var(--accent);
  font-weight: 700;
  font-size: 14px;
  padding: 8px 18px;
  border-radius: 999px;
  margin-bottom: 26px;
}

.hero h1 {
  font-size: clamp(32px, 5.4vw, 54px);
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.hero h1 .highlight {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p.hero-sub {
  font-size: clamp(16px, 2vw, 19px);
  color: var(--text-light-muted);
  max-width: 620px;
  margin: 0 auto 36px;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 46px;
}

.hero-trust {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
  color: var(--text-light-muted);
  font-size: 14px;
}

.hero-trust span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.hero-trust svg {
  width: 16px;
  height: 16px;
  color: var(--accent);
  flex-shrink: 0;
}

/* ==========================================================================
   Features
   ========================================================================== */
.features {
  padding: 96px 0;
  background: var(--bg-light);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 24px;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 26px;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--bg-light-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-icon svg {
  width: 26px;
  height: 26px;
  color: var(--accent-2);
}

.feature-card h3 {
  font-size: 19px;
  margin-bottom: 10px;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 15px;
}

.feature-highlight {
  background: linear-gradient(120deg, #101833 0%, #1b1440 100%);
  border-radius: var(--radius-lg);
  padding: 40px;
  color: var(--text-light);
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 32px;
  align-items: center;
}

.feature-highlight-text h3 {
  font-size: clamp(22px, 3vw, 28px);
  margin-bottom: 14px;
}

.feature-highlight-text p {
  color: var(--text-light-muted);
  margin-bottom: 20px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-pill {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.feature-highlight-visual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.mini-stat {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  padding: 18px;
  text-align: center;
}

.mini-stat strong {
  display: block;
  font-size: 24px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 4px;
}

.mini-stat span {
  font-size: 13px;
  color: var(--text-light-muted);
}

/* ==========================================================================
   Pricing
   ========================================================================== */
.pricing {
  padding: 96px 0;
  background: var(--bg-light-alt);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.price-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px 28px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow);
  position: relative;
}

.price-card.featured {
  border: 2px solid var(--accent-2);
  transform: scale(1.04);
  box-shadow: var(--shadow-lg);
  z-index: 1;
}

.price-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-gradient);
  color: #051224;
  font-size: 13px;
  font-weight: 800;
  padding: 6px 18px;
  border-radius: 999px;
  box-shadow: 0 8px 20px rgba(139, 92, 246, 0.35);
}

.price-card h3 {
  font-size: 18px;
  color: var(--text-muted);
  font-weight: 700;
  margin-bottom: 14px;
}

.price-amount {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-bottom: 6px;
}

.price-amount .currency {
  font-size: 20px;
  font-weight: 700;
}

.price-amount .value {
  font-size: 44px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.price-amount .period {
  font-size: 15px;
  color: var(--text-muted);
  font-weight: 600;
}

.price-note {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 22px;
}

.price-features {
  margin-bottom: 26px;
  flex-grow: 1;
}

.price-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 15px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--border);
}

.price-features li:last-child {
  border-bottom: none;
}

.price-features svg {
  width: 18px;
  height: 18px;
  color: var(--success);
  flex-shrink: 0;
  margin-top: 2px;
}

.price-desc {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 22px;
  line-height: 1.7;
}

/* ==========================================================================
   Why choose
   ========================================================================== */
.why-choose {
  padding: 96px 0;
  background: var(--bg-light);
}

.why-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.why-item {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 22px;
  padding: 30px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.why-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
}

.why-icon svg {
  width: 30px;
  height: 30px;
  color: #051224;
}

.why-item h3 {
  font-size: 20px;
  margin-bottom: 10px;
}

.why-item p {
  color: var(--text-muted);
  font-size: 15.5px;
}

.why-item p + p {
  margin-top: 10px;
}

/* ==========================================================================
   Secondary CTA
   ========================================================================== */
.cta-section {
  padding: 90px 0;
  text-align: center;
  color: var(--text-light);
  background: radial-gradient(ellipse 70% 80% at 50% 0%, rgba(139, 92, 246, 0.35), transparent),
    linear-gradient(180deg, var(--bg-dark-2) 0%, var(--bg-dark) 100%);
}

.cta-section h2 {
  font-size: clamp(26px, 4vw, 38px);
  margin-bottom: 16px;
}

.cta-section p {
  color: var(--text-light-muted);
  font-size: 17px;
  max-width: 560px;
  margin: 0 auto 36px;
}

/* ==========================================================================
   Testimonials marquee
   ========================================================================== */
.testimonials {
  padding: 96px 0;
  background: var(--bg-light-alt);
  overflow: hidden;
}

.marquee {
  width: 100%;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, black 8%, black 92%, transparent);
  mask-image: linear-gradient(90deg, transparent, black 8%, black 92%, transparent);
}

.marquee-track {
  display: flex;
  gap: 20px;
  width: max-content;
  animation: marquee-scroll 42s linear infinite;
}

.marquee:hover .marquee-track {
  animation-play-state: paused;
}

@keyframes marquee-scroll {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-50%);
  }
}

.review-card {
  width: 320px;
  flex-shrink: 0;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.review-stars {
  color: var(--warning);
  letter-spacing: 3px;
  font-size: 15px;
  margin-bottom: 14px;
}

.review-card p {
  font-size: 14.5px;
  color: var(--text-main);
  margin-bottom: 18px;
  line-height: 1.7;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 10px;
}

.review-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #051224;
  font-weight: 800;
  font-size: 14px;
  flex-shrink: 0;
}

.review-author strong {
  display: block;
  font-size: 14px;
}

.review-author span {
  font-size: 12.5px;
  color: var(--text-muted);
}

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq {
  padding: 96px 0;
  background: var(--bg-light);
}

.faq-list {
  max-width: 780px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 20px 24px;
  font-weight: 700;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--bg-light-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease;
}

.faq-icon svg {
  width: 12px;
  height: 12px;
  color: var(--accent-2);
}

.faq-item[open] .faq-icon {
  transform: rotate(45deg);
}

.faq-item p {
  padding: 0 24px 22px;
  color: var(--text-muted);
  font-size: 15px;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--bg-dark);
  color: var(--text-light-muted);
  padding: 64px 0 28px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: 24px;
}

.footer-brand .brand {
  margin-bottom: 14px;
}

.footer-brand p {
  max-width: 320px;
  font-size: 14px;
  line-height: 1.8;
}

.footer-links {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
}

.footer-col h4 {
  color: var(--text-light);
  font-size: 15px;
  margin-bottom: 16px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  font-size: 14px;
  transition: color 0.15s ease;
}

.footer-col a:hover {
  color: var(--accent);
}

.footer-bottom {
  text-align: center;
  font-size: 13px;
}

.footer-bottom a {
  color: var(--text-light-muted);
}

.footer-bottom a:hover {
  color: var(--accent);
}

/* ==========================================================================
   Simple content pages (about / terms / privacy / sitemap)
   ========================================================================== */
.page-header {
  padding: 150px 0 60px;
  background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-dark-2) 100%);
  color: var(--text-light);
}

.page-header .container {
  max-width: 780px;
}

.page-header h1 {
  font-size: clamp(28px, 4vw, 38px);
  margin-bottom: 12px;
}

.page-header p {
  color: var(--text-light-muted);
  font-size: 16px;
}

.page-body {
  padding: 60px 0 100px;
}

.page-body .container {
  max-width: 780px;
}

.page-body h2 {
  font-size: 22px;
  margin: 36px 0 14px;
}

.page-body h2:first-child {
  margin-top: 0;
}

.page-body p {
  color: var(--text-muted);
  margin-bottom: 14px;
  font-size: 15.5px;
}

.page-body ul {
  margin: 0 0 14px 4px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-body ul li {
  color: var(--text-muted);
  font-size: 15.5px;
  padding-left: 20px;
  position: relative;
}

.page-body ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-2);
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.sitemap-grid a {
  display: block;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  color: var(--text-main);
}

.sitemap-grid a:hover {
  color: var(--accent-2);
}

.back-home {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-light-muted);
  font-size: 14px;
  font-weight: 600;
}

.back-home:hover {
  color: var(--accent);
}

/* ==========================================================================
   Breadcrumbs
   ========================================================================== */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13.5px;
  color: var(--text-light-muted);
  margin-bottom: 18px;
}

.breadcrumb a {
  color: var(--text-light-muted);
  font-weight: 600;
}

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

.breadcrumb .crumb-sep {
  opacity: 0.5;
}

.breadcrumb .crumb-current {
  color: var(--text-light);
  font-weight: 700;
}

/* ==========================================================================
   Article hub (推荐资讯)
   ========================================================================== */
.articles-page .page-header .container,
.articles-page .page-body .container {
  max-width: var(--max-width);
}

.article-meta-row {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  color: var(--text-light-muted);
  font-size: 13.5px;
  margin-top: 18px;
}

.article-meta-row .tag-pill {
  padding: 5px 14px;
  font-size: 12.5px;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  display: flex;
  flex-direction: column;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 26px;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.article-card .article-cat {
  align-self: flex-start;
  margin-bottom: 14px;
}

.article-card h2,
.article-card h3 {
  font-size: 19px;
  margin-bottom: 10px;
}

.article-card p {
  color: var(--text-muted);
  font-size: 14.5px;
  flex-grow: 1;
  margin-bottom: 18px;
}

.article-card .article-date {
  font-size: 12.5px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.article-card .read-more {
  font-weight: 700;
  color: var(--accent-2);
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.article-card:hover .read-more {
  color: var(--accent);
}

/* ==========================================================================
   Article body (single article page)
   ========================================================================== */
.article-body {
  max-width: 760px;
  margin: 0 auto;
}

.article-body h2 {
  font-size: clamp(20px, 3vw, 25px);
  margin: 42px 0 16px;
}

.article-body h2:first-of-type {
  margin-top: 0;
}

.article-body h3 {
  font-size: 18px;
  margin: 26px 0 12px;
}

.article-body p {
  color: var(--text-main);
  font-size: 16px;
  line-height: 1.9;
  margin-bottom: 16px;
}

.article-body ul,
.article-body ol {
  margin: 0 0 18px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.article-body li {
  color: var(--text-main);
  font-size: 15.5px;
  line-height: 1.8;
}

.article-body a.ext-link {
  color: var(--accent-2);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
}

.article-body a.ext-link:hover {
  color: var(--accent);
}

.article-body .table-wrap {
  overflow-x: auto;
  margin: 20px 0 26px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
  min-width: 480px;
}

.article-body th,
.article-body td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.article-body th {
  background: var(--bg-light-alt);
  font-weight: 700;
  color: var(--text-main);
}

.article-body tr:last-child td {
  border-bottom: none;
}

.article-body blockquote {
  border-left: 3px solid var(--accent-2);
  padding: 4px 0 4px 18px;
  color: var(--text-muted);
  margin: 24px 0;
  font-size: 15.5px;
}

.related-reading {
  max-width: 760px;
  margin: 56px auto 0;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.related-reading h2 {
  font-size: 20px;
  margin-bottom: 18px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.related-grid a {
  display: block;
  background: var(--bg-light-alt);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-main);
  transition: color 0.15s ease, background 0.15s ease;
}

.related-grid a:hover {
  color: var(--accent-2);
  background: #e5e9ff;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 960px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .feature-highlight {
    grid-template-columns: 1fr;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 420px;
    margin: 0 auto;
  }

  .price-card.featured {
    transform: none;
  }

  .why-item {
    grid-template-columns: 52px 1fr;
    padding: 24px;
  }

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

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

@media (max-width: 768px) {
  .nav-links,
  .nav-actions .btn-ghost {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .menu-toggle:checked ~ .container .hamburger span {
    background: transparent;
  }

  .menu-toggle:checked ~ .container .hamburger span::before {
    transform: rotate(45deg) translate(4px, 5px);
  }

  .menu-toggle:checked ~ .container .hamburger span::after {
    transform: rotate(-45deg) translate(4px, -5px);
  }

  .mobile-menu {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: rgba(11, 17, 32, 0.97);
    backdrop-filter: blur(14px);
    padding: 18px 24px 26px;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    z-index: 99;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
  }

  .menu-toggle:checked ~ .mobile-menu {
    display: flex;
  }

  .mobile-menu a {
    color: var(--text-light);
    font-weight: 600;
    padding: 14px 4px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    min-height: 48px;
    display: flex;
    align-items: center;
  }

  .mobile-menu .btn {
    margin-top: 14px;
  }

  .hero {
    padding: 130px 0 70px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
  }

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

  .feature-highlight {
    padding: 28px 22px;
  }

  .feature-highlight-visual {
    grid-template-columns: 1fr 1fr;
  }

  .why-item {
    grid-template-columns: 1fr;
  }

  .why-icon {
    width: 52px;
    height: 52px;
  }

  .footer-top {
    flex-direction: column;
  }

  .footer-links {
    gap: 32px;
  }

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

  .section-head {
    margin-bottom: 34px;
  }

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

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

@media (max-width: 420px) {
  .container {
    padding: 0 18px;
  }

  .price-card.featured {
    transform: none;
  }
}