/* Design tokens — matches Arcline iOS dark mode palette */
:root {
  --bg:           #0A0E1A;
  --bg-surface:   #111827;
  --bg-surface-2: #1A2D3D;
  --text-primary:    rgba(255, 255, 255, 0.92);
  --text-secondary:  rgba(255, 255, 255, 0.60);
  --text-tertiary:   rgba(255, 255, 255, 0.38);
  --brand-primary:   #5B9BD5;
  --brand-accent:    #2DD4BF;
  --border:          rgba(255, 255, 255, 0.08);
  --radius: 12px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --max-w:       1100px;
  --max-w-prose:  680px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ─── Layout ─── */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.prose     { max-width: var(--max-w-prose); margin: 0 auto; }

/* ─── Typography ─── */
h1, h2, h3, h4 { line-height: 1.25; font-weight: 700; color: var(--text-primary); }
h1 { font-size: clamp(2rem, 5vw, 3rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); letter-spacing: -0.02em; }
h3 { font-size: 1.125rem; }
p  { color: var(--text-secondary); }
a  { color: var(--brand-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ─── Nav ─── */
nav {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(10, 14, 26, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 100;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  text-decoration: none;
}
.nav-logo-mark {
  width: 28px;
  height: 28px;
  display: block;
}
.nav-logo-word {
  font-size: 0.9375rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-primary);
}
.nav-logo:hover { text-decoration: none; }
.nav-links { display: flex; align-items: center; gap: 28px; list-style: none; }
.nav-links a { color: var(--text-secondary); font-size: 0.9375rem; transition: color 0.15s; }
.nav-links a:hover { color: var(--text-primary); text-decoration: none; }
.nav-cta {
  background: var(--brand-accent) !important;
  color: #0A0E1A !important;
  font-weight: 600 !important;
  padding: 7px 16px;
  border-radius: 8px;
  font-size: 0.875rem !important;
  transition: opacity 0.15s !important;
}
.nav-cta:hover { opacity: 0.88; text-decoration: none !important; }

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.15s;
  text-decoration: none;
}
.btn:hover { opacity: 0.88; transform: translateY(-1px); text-decoration: none; }
.btn-primary  { background: var(--brand-accent); color: #0A0E1A; }
.btn-secondary { background: var(--bg-surface); color: var(--text-primary); border: 1px solid var(--border); }

/* ─── Hero ─── */
.hero {
  padding: 96px 0 80px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}
.hero-eyebrow {
  display: inline-block;
  background: var(--bg-surface-2);
  color: var(--brand-accent);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 28px;
  border: 1px solid rgba(45, 212, 191, 0.2);
}
.hero h1 { margin-bottom: 20px; }
.hero h1 span { color: var(--brand-primary); }
.hero > .container > p {
  font-size: 1.125rem;
  max-width: 520px;
  margin: 0 auto 36px;
  line-height: 1.7;
}
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ─── Features ─── */
.features { padding: 80px 0; border-bottom: 1px solid var(--border); }
.section-title { text-align: center; margin-bottom: 52px; }
.section-title h2 { margin-bottom: 10px; }
.section-title p { font-size: 1.0625rem; }
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}
.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.2s;
}
.feature-card:hover { border-color: rgba(91, 155, 213, 0.25); }
.feature-icon {
  width: 44px;
  height: 44px;
  background: var(--bg-surface-2);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 1.25rem;
}
.feature-card h3 { margin-bottom: 8px; font-size: 1rem; }
.feature-card p  { font-size: 0.9375rem; line-height: 1.65; }

/* ─── Blog grid ─── */
.blog-section { padding: 80px 0; }
.post-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.post-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s;
}
.post-card:hover { border-color: rgba(91, 155, 213, 0.3); }
.post-date { font-size: 0.8125rem; color: var(--text-tertiary); margin-bottom: 10px; }
.post-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  margin-bottom: 10px;
}
.post-meta-dot { opacity: 0.55; }
.post-card h3 { margin-bottom: 10px; font-size: 1rem; line-height: 1.4; }
.post-card h3 a { color: var(--text-primary); }
.post-card h3 a:hover { color: var(--brand-primary); text-decoration: none; }
.post-excerpt { font-size: 0.9375rem; flex-grow: 1; margin-bottom: 20px; line-height: 1.65; }
.read-more { font-size: 0.875rem; font-weight: 600; color: var(--brand-primary); }

/* ─── Blog page header ─── */
.page-header {
  padding: 64px 0 40px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 48px;
}
.page-header h1 { margin-bottom: 8px; }
.page-header p { font-size: 1.0625rem; }

/* ─── Article layout ─── */
.article-header { padding: 64px 0 36px; }
.article-header h1 { margin-bottom: 16px; }
.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-tertiary);
  font-size: 0.875rem;
}
.article-meta-dot { opacity: 0.55; }
.article-body { padding-bottom: 48px; }

/* ─── Related posts + prev/next nav ─── */
.related-posts {
  margin: 48px auto 0;
  padding: 32px 0 0;
  border-top: 1px solid var(--border);
}
.related-posts h2 {
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  font-weight: 700;
  margin-bottom: 18px;
}
.related-list { list-style: none; display: flex; flex-direction: column; gap: 6px; }
.related-list a {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-primary);
}
.related-list a:hover { text-decoration: none; }
.related-list a:hover .related-title { color: var(--brand-primary); }
.related-date {
  color: var(--text-tertiary);
  font-size: 0.8125rem;
  min-width: 108px;
}
.related-title {
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.45;
  transition: color 0.15s;
}

.article-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 48px auto 96px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}
.article-nav-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.2s;
  color: var(--text-primary);
}
.article-nav-link:hover { border-color: rgba(91, 155, 213, 0.3); text-decoration: none; }
.article-nav-next { text-align: right; align-items: flex-end; }
.article-nav-label {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  font-weight: 600;
}
.article-nav-title {
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.4;
}
@media (max-width: 640px) {
  .article-nav { grid-template-columns: 1fr; }
  .article-nav-next { text-align: left; align-items: flex-start; }
}

.article-body h2 { font-size: 1.4375rem; margin: 44px 0 16px; }
.article-body h3 { font-size: 1.125rem; margin: 32px 0 12px; }
.article-body p  { margin-bottom: 20px; color: var(--text-secondary); line-height: 1.78; }
.article-body ul,
.article-body ol { margin: 0 0 20px 24px; color: var(--text-secondary); line-height: 1.78; }
.article-body li { margin-bottom: 6px; }
.article-body strong { color: var(--text-primary); font-weight: 600; }
.article-body blockquote {
  border-left: 3px solid var(--brand-primary);
  padding-left: 20px;
  margin: 28px 0;
  color: var(--text-tertiary);
  font-style: italic;
}
.article-body table { width: 100%; border-collapse: collapse; margin: 28px 0; font-size: 0.9375rem; }
.article-body th,
.article-body td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}
.article-body th { color: var(--text-primary); font-weight: 600; }
.article-body td { color: var(--text-secondary); }

/* ─── Disclaimer ─── */
.disclaimer {
  background: var(--bg-surface);
  border-left: 3px solid var(--brand-primary);
  border-radius: 0 8px 8px 0;
  padding: 14px 18px;
  margin-bottom: 40px;
  font-size: 0.875rem;
  color: var(--text-tertiary);
  line-height: 1.6;
}

/* ─── Article CTA ─── */
.article-cta {
  background: var(--bg-surface);
  border: 1px solid rgba(45, 212, 191, 0.2);
  border-radius: var(--radius);
  padding: 36px 32px;
  margin-top: 56px;
  text-align: center;
}
.article-cta h3 { margin-bottom: 10px; font-size: 1.125rem; }
.article-cta p  { margin-bottom: 24px; font-size: 0.9375rem; }

/* ─── Features page ─── */
.features-hero { padding: 72px 0 48px; border-bottom: 1px solid var(--border); }
.features-hero-eyebrow {
  display: inline-block;
  color: var(--brand-accent);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 12px;
}
.features-hero h1 { font-size: clamp(2rem, 4vw, 2.75rem); line-height: 1.15; max-width: 760px; margin-bottom: 16px; }
.features-hero p { color: var(--text-secondary); font-size: 1.0625rem; max-width: 640px; margin-bottom: 28px; }

.features-block { padding: 72px 0; border-bottom: 1px solid var(--border); }
.features-block-alt { background: var(--surface); }
.feature-row {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 64px;
  align-items: center;
}
.feature-row-reverse .feature-row-copy { order: 2; }
.feature-row-reverse .feature-row-visual { order: 1; }
.feature-row-tag {
  color: var(--brand-accent);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  margin-bottom: 10px;
}
.feature-row h2 { font-size: clamp(1.5rem, 2.6vw, 1.875rem); line-height: 1.2; margin-bottom: 14px; max-width: 520px; }
.feature-row p { color: var(--text-secondary); font-size: 1rem; margin-bottom: 18px; max-width: 560px; }
.feature-row-bullets { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.feature-row-bullets li {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  padding-left: 22px;
  position: relative;
}
.feature-row-bullets li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--brand-accent);
}
.feature-row-visual {
  display: flex;
  justify-content: center;
}
.feature-visual-card {
  width: 100%;
  max-width: 360px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px 24px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.25);
}
.features-block-alt .feature-visual-card { background: var(--surface-alt, #121828); }
.visual-label {
  color: var(--text-tertiary);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 10px;
}
.visual-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.1;
  margin-bottom: 8px;
}
.visual-value span {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-tertiary);
  letter-spacing: 0.02em;
  margin-left: 4px;
}
.visual-meta { color: var(--text-tertiary); font-size: 0.8125rem; line-height: 1.5; }

.features-cta { padding: 96px 0; text-align: center; }
.features-cta h2 { font-size: clamp(1.75rem, 3vw, 2.25rem); margin-bottom: 12px; }
.features-cta p { color: var(--text-secondary); margin-bottom: 28px; }
.features-cta .hero-actions { justify-content: center; }

@media (max-width: 860px) {
  .feature-row { grid-template-columns: 1fr; gap: 36px; }
  .feature-row-reverse .feature-row-copy { order: initial; }
  .feature-row-reverse .feature-row-visual { order: initial; }
  .features-block { padding: 56px 0; }
}

/* ─── Prose pages (privacy, terms, support) ─── */
.prose-page { padding: 72px 0 96px; }
.prose-page h1 { margin-bottom: 6px; }
.prose-page .updated { color: var(--text-tertiary); font-size: 0.875rem; margin-bottom: 48px; display: block; }
.prose-page h2 { margin: 44px 0 14px; font-size: 1.25rem; }
.prose-page p  { margin-bottom: 18px; color: var(--text-secondary); line-height: 1.75; }
.prose-page ul { margin: 0 0 18px 24px; color: var(--text-secondary); line-height: 1.75; }
.prose-page li { margin-bottom: 6px; }
.prose-page a  { color: var(--brand-primary); }

/* ─── Footer ─── */
footer { border-top: 1px solid var(--border); padding: 48px 0; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.footer-subscribe {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  padding-bottom: 40px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--border);
}
.footer-subscribe-copy h2 {
  font-size: 1.25rem;
  margin-bottom: 6px;
  color: var(--text-primary);
}
.footer-subscribe-copy p {
  color: var(--text-tertiary);
  font-size: 0.9375rem;
  margin: 0;
}
.subscribe-form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
}
.subscribe-form input[type=email] {
  background: var(--surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  font-size: 0.9375rem;
  font-family: inherit;
  transition: border-color 0.15s;
}
.subscribe-form input[type=email]:focus {
  outline: none;
  border-color: var(--brand-primary);
}
.subscribe-btn {
  background: var(--brand-primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0 20px;
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
}
.subscribe-btn:hover { background: var(--brand-primary-hover, var(--brand-primary)); filter: brightness(1.08); }
.subscribe-btn:disabled { opacity: 0.6; cursor: not-allowed; }
.subscribe-status {
  grid-column: 1 / -1;
  margin: 4px 0 0;
  font-size: 0.8125rem;
  min-height: 1em;
  color: var(--text-tertiary);
}
.subscribe-status.is-success { color: var(--brand-accent); }
.subscribe-status.is-error { color: #f87171; }
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}
.footer-logo { font-size: 0.9375rem; font-weight: 700; }
.footer-logo span { color: var(--brand-accent); }
.footer-links { display: flex; gap: 24px; list-style: none; }
.footer-links a { color: var(--text-tertiary); font-size: 0.875rem; transition: color 0.15s; }
.footer-links a:hover { color: var(--text-secondary); text-decoration: none; }
.footer-copy { color: var(--text-tertiary); font-size: 0.8125rem; }

/* ─── Responsive ─── */
@media (max-width: 640px) {
  .nav-links { display: none; }
  .hero { padding: 56px 0 48px; }
  .features, .blog-section { padding: 56px 0; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 16px; }
  .footer-subscribe { grid-template-columns: 1fr; gap: 20px; padding-bottom: 32px; margin-bottom: 24px; }
  .article-header { padding: 48px 0 24px; }
}