/* ─── Variables ─────────────────────────────────────────────────────────────── */
:root {
  --indigo:       #3d3bbf;
  --indigo-dark:  #2d2a9e;
  --indigo-light: #6366f1;
  --indigo-50:    #eef2ff;
  --indigo-100:   #e0e7ff;
  --gray-50:      #f8fafc;
  --gray-100:     #f1f5f9;
  --gray-200:     #e2e8f0;
  --gray-400:     #94a3b8;
  --gray-500:     #64748b;
  --gray-700:     #334155;
  --gray-900:     #0f172a;
  --radius:       12px;
  --shadow-sm:    0 1px 3px rgba(0,0,0,.08);
  --shadow-md:    0 4px 16px rgba(0,0,0,.10);
  --shadow-lg:    0 12px 40px rgba(0,0,0,.12);
}

/* ─── Reset & Base ──────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--gray-900);
  background: #fff;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--indigo); }

/* ─── Reading progress bar ──────────────────────────────────────────────────── */
#reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--indigo), var(--indigo-light));
  width: 0%;
  z-index: 9999;
  transition: width .1s linear;
}

/* ─── Navbar ────────────────────────────────────────────────────────────────── */
.hx-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--gray-200);
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.hx-nav__logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.hx-nav__logo img { height: 28px; width: auto; }
.hx-nav__logo-name { font-weight: 700; font-size: 1rem; color: var(--indigo); letter-spacing: -.01em; }

.hx-nav__links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.hx-nav__links a {
  font-size: .875rem;
  font-weight: 500;
  color: var(--gray-500);
  text-decoration: none;
  transition: color .15s;
}
.hx-nav__links a:hover,
.hx-nav__links a.active { color: var(--indigo); }

.hx-nav__cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--indigo);
  color: #fff !important;
  font-size: .85rem;
  font-weight: 600;
  padding: 9px 20px;
  border-radius: 8px;
  text-decoration: none;
  transition: background .15s, transform .15s;
  white-space: nowrap;
}
.hx-nav__cta:hover { background: var(--indigo-dark); transform: translateY(-1px); }

.hx-nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}
.hx-nav__burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--gray-700);
  border-radius: 2px;
  transition: all .2s;
}

/* ─── Mobile nav ────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .hx-nav__links { display: none; }
  .hx-nav__burger { display: flex; }

  .hx-nav__links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--gray-200);
    padding: 20px 24px;
    gap: 16px;
    box-shadow: var(--shadow-md);
  }
}

/* ─── Blog card ─────────────────────────────────────────────────────────────── */
.blog-card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform .2s, box-shadow .2s;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
}
.blog-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--indigo-100);
}
.blog-card__img {
  height: 180px;
  background: linear-gradient(135deg, var(--indigo-50), var(--indigo-100));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
}
.blog-card__body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.blog-card__tag {
  display: inline-block;
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--indigo);
  background: var(--indigo-50);
  border: 1px solid var(--indigo-100);
  border-radius: 100px;
  padding: 2px 10px;
  margin-bottom: 10px;
}
.blog-card__title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-900);
  margin: 0 0 8px;
  line-height: 1.35;
}
.blog-card__desc {
  font-size: .875rem;
  color: var(--gray-500);
  line-height: 1.6;
  flex: 1;
  margin: 0 0 16px;
}
.blog-card__link {
  font-size: .85rem;
  font-weight: 600;
  color: var(--indigo);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.blog-card__link:hover { gap: 8px; }

/* ─── Blog grid ─────────────────────────────────────────────────────────────── */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

/* ─── Article prose ─────────────────────────────────────────────────────────── */
.prose {
  max-width: 720px;
  color: var(--gray-700);
  font-size: 1.0625rem;
  line-height: 1.75;
}
.prose h1 {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--gray-900);
  line-height: 1.15;
  margin: 0 0 16px;
}
.prose h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-900);
  margin: 48px 0 16px;
  padding-top: 8px;
  border-top: 2px solid var(--indigo-100);
}
.prose h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--gray-900);
  margin: 28px 0 10px;
}
.prose p { margin: 0 0 20px; }
.prose ul, .prose ol { margin: 0 0 20px; padding-left: 24px; }
.prose li { margin-bottom: 8px; }
.prose strong { color: var(--gray-900); font-weight: 700; }
.prose a { color: var(--indigo); font-weight: 500; }
.prose a:hover { text-decoration: underline; }
.prose blockquote {
  border-left: 4px solid var(--indigo);
  margin: 28px 0;
  padding: 16px 20px;
  background: var(--indigo-50);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
  color: var(--gray-700);
}
.prose blockquote p { margin: 0; }

/* ─── Comparison table ──────────────────────────────────────────────────────── */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: .9rem;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.comparison-table th {
  background: var(--indigo);
  color: #fff;
  padding: 14px 16px;
  text-align: left;
  font-weight: 700;
  font-size: .85rem;
}
.comparison-table th:first-child { background: var(--indigo-dark); }
.comparison-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--gray-200);
  vertical-align: top;
}
.comparison-table tr:nth-child(even) td { background: var(--gray-50); }
.comparison-table tr:last-child td { border-bottom: none; }
.comparison-table .check { color: #16a34a; font-weight: 700; }
.comparison-table .cross { color: #dc2626; }
.comparison-table .partial { color: #d97706; }

/* ─── Article TOC ────────────────────────────────────────────────────────────── */
.toc {
  background: var(--indigo-50);
  border: 1px solid var(--indigo-100);
  border-left: 4px solid var(--indigo);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 20px 24px;
  margin: 0 0 36px;
}
.toc__title {
  font-size: .8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--indigo);
  margin: 0 0 12px;
}
.toc ol { margin: 0; padding-left: 20px; }
.toc li { margin-bottom: 6px; }
.toc a {
  color: var(--gray-700);
  font-size: .9rem;
  text-decoration: none;
  font-weight: 500;
}
.toc a:hover { color: var(--indigo); }

/* ─── Article meta ───────────────────────────────────────────────────────────── */
.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--gray-200);
  font-size: .85rem;
  color: var(--gray-400);
}
.article-meta .tag {
  background: var(--indigo-50);
  color: var(--indigo);
  border: 1px solid var(--indigo-100);
  border-radius: 100px;
  padding: 3px 12px;
  font-weight: 700;
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .06em;
}

/* ─── Highlight box ──────────────────────────────────────────────────────────── */
.highlight-box {
  background: linear-gradient(135deg, var(--indigo-50), #fff);
  border: 1px solid var(--indigo-100);
  border-left: 4px solid var(--indigo);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 20px 24px;
  margin: 28px 0;
}
.highlight-box p { margin: 0; font-size: .95rem; }
.highlight-box strong { color: var(--indigo); }

/* ─── Step card ──────────────────────────────────────────────────────────────── */
.step-list { list-style: none; padding: 0; margin: 0 0 24px; }
.step-item {
  display: flex;
  gap: 16px;
  padding: 20px;
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  margin-bottom: 12px;
  transition: border-color .2s;
}
.step-item:hover { border-color: var(--indigo-light); }
.step-num {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--indigo);
  color: #fff;
  font-weight: 800;
  font-size: .9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.step-content h3 { margin: 0 0 6px; font-size: 1rem; }
.step-content p { margin: 0; font-size: .9rem; color: var(--gray-500); }

/* ─── Error card ─────────────────────────────────────────────────────────────── */
.error-card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
  border-left: 4px solid #ef4444;
}
.error-card h3 { margin: 0 0 8px; font-size: 1rem; color: #dc2626; }
.error-card p { margin: 0; font-size: .9rem; color: var(--gray-500); }
.error-card .solution {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--gray-100);
  font-size: .9rem;
  color: #16a34a;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

/* ─── CTA inline (article) ───────────────────────────────────────────────────── */
.article-cta {
  background: linear-gradient(135deg, var(--indigo), var(--indigo-light));
  border-radius: 16px;
  padding: 36px 32px;
  color: #fff;
  text-align: center;
  margin: 48px 0 24px;
}
.article-cta h3 { margin: 0 0 10px; font-size: 1.4rem; font-weight: 800; color: #fff; }
.article-cta p { margin: 0 0 24px; opacity: .9; font-size: 1rem; }
.btn-white {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  color: var(--indigo);
  font-weight: 700;
  font-size: .9rem;
  padding: 12px 28px;
  border-radius: 8px;
  text-decoration: none;
  transition: transform .15s, box-shadow .15s;
}
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,.2); }

/* ─── Related articles ───────────────────────────────────────────────────────── */
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 16px;
}
.related-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: 10px;
  text-decoration: none;
  font-size: .875rem;
  font-weight: 600;
  color: var(--gray-700);
  transition: all .15s;
}
.related-link:hover {
  background: var(--indigo-50);
  border-color: var(--indigo-100);
  color: var(--indigo);
}
.related-link .icon { font-size: 1.2rem; flex-shrink: 0; }

/* ─── Section helpers ────────────────────────────────────────────────────────── */
.section { padding: 72px 24px; }
.section--gray { background: var(--gray-50); }
.section--indigo {
  background: linear-gradient(135deg, var(--indigo), var(--indigo-light));
  color: #fff;
}
.container { max-width: 1100px; margin: 0 auto; }
.container--narrow { max-width: 780px; margin: 0 auto; }

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--indigo-50);
  border: 1px solid var(--indigo-100);
  color: var(--indigo);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  padding: 4px 14px;
  border-radius: 100px;
  margin-bottom: 16px;
}
.section--indigo .section-label {
  background: rgba(255,255,255,.15);
  border-color: rgba(255,255,255,.25);
  color: #fff;
}

h2.section-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--gray-900);
  margin: 0 0 12px;
  line-height: 1.2;
}
.section--indigo h2.section-title { color: #fff; }

.section-desc {
  font-size: 1.05rem;
  color: var(--gray-500);
  max-width: 560px;
  margin: 0 0 48px;
}
.section--indigo .section-desc { color: rgba(255,255,255,.8); }

/* ─── Stats row ──────────────────────────────────────────────────────────────── */
.stats-row {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  justify-content: center;
  margin-top: 48px;
}
.stat-item { text-align: center; }
.stat-item .number {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--indigo);
  line-height: 1;
  margin-bottom: 6px;
}
.stat-item .label { font-size: .85rem; color: var(--gray-500); font-weight: 500; }

/* ─── Footer ─────────────────────────────────────────────────────────────────── */
.hx-footer {
  background: var(--gray-900);
  color: var(--gray-400);
  padding: 56px 24px 28px;
}
.hx-footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  max-width: 1100px;
  margin: 0 auto 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.hx-footer__logo { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; text-decoration: none; }
.hx-footer__logo img { height: 26px; width: auto; }
.hx-footer__logo-name { font-weight: 700; font-size: 1rem; color: #fff; }
.hx-footer p { font-size: .875rem; line-height: 1.6; max-width: 280px; margin: 0 0 20px; }
.hx-footer h5 { color: #fff; font-size: .85rem; font-weight: 700; margin: 0 0 16px; }
.hx-footer ul { list-style: none; padding: 0; margin: 0; }
.hx-footer li { margin-bottom: 10px; }
.hx-footer a {
  color: var(--gray-400);
  text-decoration: none;
  font-size: .875rem;
  transition: color .15s;
}
.hx-footer a:hover { color: #fff; }
.hx-footer__bottom {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: .8rem;
}

/* Newsletter in footer */
.newsletter-form {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}
.newsletter-form input {
  flex: 1;
  padding: 9px 14px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,.15);
  background: rgba(255,255,255,.07);
  color: #fff;
  font-size: .85rem;
  outline: none;
  font-family: inherit;
}
.newsletter-form input::placeholder { color: var(--gray-400); }
.newsletter-form input:focus { border-color: var(--indigo-light); }
.newsletter-form button {
  background: var(--indigo);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 9px 16px;
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: background .15s;
}
.newsletter-form button:hover { background: var(--indigo-light); }

/* ─── Breadcrumb ─────────────────────────────────────────────────────────────── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .82rem;
  color: var(--gray-400);
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--gray-400); text-decoration: none; }
.breadcrumb a:hover { color: var(--indigo); }
.breadcrumb span { color: var(--gray-400); }

/* ─── Responsive ─────────────────────────────────────────────────────────────── */
@media (max-width: 960px) {
  .hx-footer__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .section { padding: 48px 16px; }
  h2.section-title { font-size: 1.6rem; }
  .hx-footer__grid { grid-template-columns: 1fr; gap: 28px; }
  .prose h1 { font-size: 1.65rem; }
  .prose h2 { font-size: 1.25rem; }
  .stats-row { gap: 24px; }
  .stat-item .number { font-size: 2rem; }
  .article-cta { padding: 24px 20px; }
  .article-cta h3 { font-size: 1.2rem; }
}

/* ─── Sticky newsletter CTA ──────────────────────────────────────────────────── */
#newsletter-sticky {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 200;
  background: var(--indigo);
  color: #fff;
  padding: 14px 56px 14px 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  transform: translateY(100%);
  transition: transform .35s cubic-bezier(.4,0,.2,1);
  box-shadow: 0 -4px 24px rgba(61,59,191,.28);
  flex-wrap: wrap;
}
#newsletter-sticky.visible { transform: translateY(0); }
#newsletter-sticky strong { font-size: .9rem; font-weight: 600; white-space: nowrap; }
#newsletter-sticky-close {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: rgba(255,255,255,.6);
  cursor: pointer;
  font-size: 1rem;
  padding: 6px 8px;
  line-height: 1;
  border-radius: 4px;
  transition: color .15s, background .15s;
}
#newsletter-sticky-close:hover { color: #fff; background: rgba(255,255,255,.1); }
#newsletter-sticky form { display: flex; gap: 8px; }
#newsletter-sticky input[type="email"] {
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,.3);
  background: rgba(255,255,255,.12);
  color: #fff;
  font-size: .85rem;
  outline: none;
  font-family: inherit;
  width: 220px;
  transition: border-color .15s, background .15s;
}
#newsletter-sticky input[type="email"]::placeholder { color: rgba(255,255,255,.5); }
#newsletter-sticky input[type="email"]:focus { border-color: rgba(255,255,255,.65); background: rgba(255,255,255,.18); }
#newsletter-sticky button[type="submit"] {
  background: #fff;
  color: var(--indigo);
  border: none;
  border-radius: 8px;
  padding: 8px 20px;
  font-size: .85rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  white-space: nowrap;
  transition: opacity .15s;
}
#newsletter-sticky button[type="submit"]:hover { opacity: .88; }
@media (max-width: 640px) {
  #newsletter-sticky { flex-direction: column; gap: 10px; padding: 16px 48px 16px 16px; text-align: center; }
  #newsletter-sticky form { width: 100%; }
  #newsletter-sticky input[type="email"] { flex: 1; width: auto; }
}