/* ── Vercel Design System ── */
:root {
  --primary: #171717;
  --on-primary: #fff;
  --ink: #171717;
  --body: #4d4d4d;
  --mute: #888;
  --hairline: #ebebeb;
  --hairline-strong: #a1a1a1;
  --canvas: #fff;
  --canvas-soft: #fafafa;
  --canvas-soft-2: #f5f5f5;
  --link: #0070f3;
  --success: #0070f3;
  --error: #ee0000;
  --gradient-develop-start: #007cf0;
  --gradient-develop-end: #00dfd8;
  --gradient-preview-start: #7928ca;
  --gradient-preview-end: #ff0080;
  --gradient-ship-start: #ff4d4d;
  --gradient-ship-end: #f9cb28;
  --font-sans: Inter, system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;
  --pill: 100px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
}
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  color: var(--body);
  background: var(--canvas);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--ink); text-decoration: none; }
img { max-width: 100%; display: block; }

/* ── Nav Bar ── */
nav.nav-bar {
  position: sticky; top: 0; z-index: 100; height: 76px;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px;
  background: rgba(255,255,255,.85); backdrop-filter: blur(12px) saturate(1.2);
  border-bottom: 1px solid var(--hairline);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between; width: 100%;
}
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  font-size: 16px; font-weight: 400; color: var(--body);
  padding: 4px 12px; border-radius: var(--pill);
  transition: background .15s, color .15s;
  line-height: 20px; letter-spacing: -0.28px;
}
.nav-links a:hover { background: var(--canvas-soft); color: var(--ink); }
.nav-links a.active { color: var(--ink); font-weight: 500; }
.nav-ctas { display: flex; align-items: center; gap: 8px; }
.nav-cta {
  height: 28px; display: inline-flex; align-items: center;
  padding: 0 10px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 500; line-height: 20px; letter-spacing: -0.28px;
  border: 1px solid var(--hairline); background: var(--canvas); color: var(--ink);
  cursor: pointer; transition: border-color .15s, background .15s;
}
.nav-cta:hover { border-color: var(--hairline-strong); }
.nav-cta.primary {
  background: var(--primary); color: var(--on-primary); border-color: var(--primary);
}
.nav-cta.primary:hover { opacity: .9; }
.logo-wrap { display: flex; align-items: center; gap: 10px; }
.logo-wrap img { width: 52px; height: 52px; border-radius: 6px; }
.logo-wrap span { font-size: 20px; font-weight: bold; color: var(--ink); letter-spacing: -0.64px; padding-left: 5px; }
.logo-wrap.dark span { color: var(--on-primary); }
.logo-wrap.dark img { filter: brightness(10); }

/* ── Page Header ── */
.page-header {
  text-align: center; padding: 96px 24px 48px;
}
.page-header .eyebrow {
  font-family: var(--font-mono); font-size: 12px; color: var(--mute);
  text-transform: uppercase; letter-spacing: .4px; margin-bottom: 12px;
}
.page-header h1 {
  font-size: 32px; font-weight: 600; line-height: 40px;
  letter-spacing: -1.28px; color: var(--ink);
}

/* ── Section Title ── */
.section-header {
  text-align: center; margin-bottom: 48px;
}
.section-header .mono-label {
  font-family: var(--font-mono); font-size: 12px; color: var(--mute);
  text-transform: uppercase; letter-spacing: .4px;
}
.section-header h2 {
  font-size: 24px; font-weight: 600; line-height: 32px;
  letter-spacing: -0.96px; color: var(--ink); margin-top: 8px;
}
.section-header p {
  font-size: 16px; color: var(--mute); margin-top: 8px;
}

/* ── Section Alternating ── */
.section-white { background: var(--canvas); padding: 96px 24px; }
.section-soft { background: var(--canvas-soft); padding: 96px 24px; border-top: 1px solid var(--hairline); border-bottom: 1px solid var(--hairline); }
.section-dark { background: var(--primary); padding: 96px 24px; color: var(--on-primary); }
.section-inner { max-width: 1200px; margin: 0 auto; }

/* ── Stats / Fun Facts ── */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat-item { text-align: center; }
.stat-item .num { font-size: 36px; font-weight: 600; letter-spacing: -1.44px; color: var(--ink); }
.stat-item .num.dark { color: var(--on-primary); }
.stat-item .label { font-size: 14px; color: var(--mute); margin-top: 4px; }

/* ── Service Cards ── */
.service-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; }
.service-card {
  background: var(--canvas); border: 1px solid var(--hairline);
  border-radius: var(--radius-lg); padding: 32px 24px; text-align: center;
  transition: border-color .2s, box-shadow .2s;
}
.service-card:hover { border-color: var(--hairline-strong); box-shadow: 0 4px 12px rgba(0,0,0,.04); }
.service-card .icon { width: 48px; height: 48px; margin: 0 auto 16px; }
.service-card h3 { font-size: 16px; font-weight: 600; color: var(--ink); letter-spacing: -0.32px; }
.service-card p { font-size: 14px; color: var(--mute); margin-top: 8px; line-height: 1.7; }

/* ── Feature Cards (about page) ── */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; }
.feature-card {
  background: var(--canvas); border: 1px solid var(--hairline);
  border-radius: var(--radius-lg); padding: 28px 24px;
  transition: border-color .2s;
}
.feature-card:hover { border-color: var(--hairline-strong); }
.feature-card .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--link); margin-bottom: 12px; }
.feature-card h3 { font-size: 16px; font-weight: 600; color: var(--ink); letter-spacing: -0.32px; }
.feature-card p { font-size: 14px; color: var(--body); margin-top: 8px; line-height: 1.7; }

/* ── Client Logo Grid ── */
.client-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.client-item {
  display: flex; align-items: center; gap: 12px;
  padding: 16px; border: 1px solid var(--hairline); border-radius: var(--radius-md);
  background: var(--canvas); transition: border-color .2s;
}
.client-item:hover { border-color: var(--hairline-strong); }
.client-item img { width: 36px; height: 36px; border-radius: 4px; }
.client-item span { font-size: 14px; font-weight: 500; color: var(--ink); }

/* ── CTA Banner ── */
.cta-banner {
  text-align: center; padding: 80px 24px;
}
.cta-banner h2 {
  font-size: 24px; font-weight: 600; letter-spacing: -0.96px;
  color: var(--on-primary); max-width: 500px; margin: 0 auto;
}
.cta-banner .btn-cta {
  display: inline-block; margin-top: 24px;
  background: var(--on-primary); color: var(--primary);
  padding: 12px 28px; border-radius: var(--pill);
  font-size: 16px; font-weight: 500; letter-spacing: -0.32px;
  transition: opacity .15s;
}
.cta-banner .btn-cta:hover { opacity: .85; }

/* ── Contact Info ── */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: start; }
.contact-info h3 { font-size: 20px; font-weight: 600; color: var(--ink); letter-spacing: -0.6px; }
.contact-info p { font-size: 14px; color: var(--mute); margin-top: 8px; }
.contact-details { margin-top: 32px; display: flex; flex-direction: column; gap: 20px; }
.contact-details .item { display: flex; align-items: center; gap: 12px; }
.contact-details .item .icon-wrap {
  width: 40px; height: 40px; border-radius: var(--radius-md);
  background: var(--canvas-soft); display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.contact-details .item .icon-wrap svg { width: 18px; height: 18px; stroke: var(--ink); fill: none; stroke-width: 1.5; }
.contact-details .item .info-label { font-size: 12px; color: var(--mute); font-family: var(--font-mono); text-transform: uppercase; }
.contact-details .item .info-value { font-size: 14px; color: var(--ink); }
.contact-details .item .info-value a { color: var(--link); }

/* ── Form ── */
.form-card { background: var(--canvas); border: 1px solid var(--hairline); border-radius: var(--radius-lg); padding: 32px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; font-weight: 500; color: var(--ink); margin-bottom: 6px; letter-spacing: -0.28px; }
.form-group label .required { color: var(--error); margin-left: 2px; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 10px 14px;
  border: 1px solid var(--hairline); border-radius: var(--radius-md);
  font-family: var(--font-sans); font-size: 14px; font-weight: 400;
  line-height: 20px; letter-spacing: -0.28px;
  color: var(--ink); background: var(--canvas); outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  border-color: var(--link); box-shadow: 0 0 0 3px rgba(0,112,243,.10);
}
.form-group textarea { min-height: 100px; resize: vertical; }
.form-row { display: flex; gap: 20px; }
.form-row .form-group { flex: 1; }
.btn-submit {
  display: block; width: 100%; padding: 12px 0;
  background: var(--primary); color: var(--on-primary); border: none;
  border-radius: var(--pill); font-family: var(--font-sans);
  font-size: 16px; font-weight: 500; line-height: 24px;
  letter-spacing: -0.32px; cursor: pointer; transition: opacity .15s;
  margin-top: 8px;
}
.btn-submit:hover { opacity: .85; }

/* ── Articles ── */
.article-list { display: flex; flex-direction: column; gap: 20px; }
.article-card {
  display: flex; gap: 20px; align-items: flex-start;
  padding: 20px; border: 1px solid var(--hairline);
  border-radius: var(--radius-lg); transition: border-color .2s;
}
.article-card:hover { border-color: var(--hairline-strong); }
.article-card .thumb { width: 200px; height: 120px; border-radius: var(--radius-md); overflow: hidden; flex-shrink: 0; background: var(--canvas-soft); }
.article-card .thumb img { width: 100%; height: 100%; object-fit: cover; }
.article-card .thumb .date-badge {
  display: inline-block; margin-top: 4px; font-size: 11px; color: var(--mute); font-family: var(--font-mono);
}
.article-card .content { flex: 1; }
.article-card .content h3 { font-size: 20px; font-weight: 600; color: var(--ink); letter-spacing: -0.32px; }
.article-card .content h3 a { color: var(--ink); }
.article-card .content h3 a:hover { color: var(--link); }
.article-card .content p { font-size: 14px; color: var(--mute); margin-top: 6px; line-height: 1.6; }

/* ── Pagination ── */
.pagination-wrap { margin-top: 40px; text-align: center; }
.pagination-wrap ul { display: inline-flex; gap: 4px; list-style: none; }
.pagination-wrap ul li { display: inline; }
.pagination-wrap ul li a, .pagination-wrap ul li span {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 36px; height: 36px; padding: 0 10px;
  border: 1px solid var(--hairline); border-radius: var(--radius-sm);
  font-size: 14px; color: var(--body); transition: border-color .15s, background .15s;
}
.pagination-wrap ul li a:hover { border-color: var(--hairline-strong); background: var(--canvas-soft); }
.pagination-wrap ul li.active span, .pagination-wrap ul li.active a { background: var(--primary); color: var(--on-primary); border-color: var(--primary); }
.pagination-wrap ul li.disabled a { opacity: .4; pointer-events: none; }

/* ── Article Detail ── */
.article-detail-wrap { max-width: 800px; margin: 0 auto; padding: 0 24px 80px; }
.article-detail-wrap .article-title {
  font-size: 28px; font-weight: 600; line-height: 36px;
  letter-spacing: -1.12px; color: var(--ink); margin-bottom: 16px;
}
.article-detail-wrap .article-meta {
  display: flex; gap: 20px; font-size: 13px; color: var(--mute);
  padding-bottom: 20px; border-bottom: 1px solid var(--hairline); margin-bottom: 32px;
}
.article-detail-wrap .article-meta span { display: flex; align-items: center; gap: 4px; }
.article-detail-wrap .article-thumbnail { margin-bottom: 32px; border-radius: var(--radius-lg); overflow: hidden; }
.article-detail-wrap .article-body { font-size: 16px; line-height: 1.8; color: var(--body); }
.article-detail-wrap .article-body p { margin-bottom: 20px; }
.article-detail-wrap .article-body img { max-width: 100%; border-radius: var(--radius-md); margin: 20px 0; }
.article-detail-wrap .back-link { margin-top: 40px; text-align: center; }
.article-detail-wrap .back-link a {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 24px; border: 1px solid var(--hairline);
  border-radius: var(--pill); font-size: 14px; color: var(--body);
  transition: border-color .15s;
}
.article-detail-wrap .back-link a:hover { border-color: var(--hairline-strong); }

/* ── Footer ── */
footer {
  background: var(--primary); color: var(--on-primary); padding: 48px 24px 32px;
}
.footer-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; justify-content: space-between; align-items: flex-start;
  flex-wrap: wrap; gap: 32px;
}
.footer-brand { max-width: 320px; }
.footer-brand p { font-size: 14px; color: #888; margin-top: 8px; line-height: 22px; }
.footer-links { display: flex; gap: 64px; flex-wrap: wrap; }
.footer-links .col h4 { font-size: 14px; font-weight: 500; color: var(--on-primary); margin-bottom: 12px; }
.footer-links .col a { display: block; font-size: 14px; color: #888; margin-bottom: 8px; transition: color .15s; }
.footer-links .col a:hover { color: var(--on-primary); }
.footer-bottom {
  max-width: 1200px; margin: 40px auto 0; padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,.08);
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 12px; font-size: 12px; color: #666;
}
.footer-bottom a { color: #888; }
.footer-bottom a:hover { color: var(--on-primary); }
.footer-disclaimer {
  max-width: 1200px; margin: 16px auto 0;
  font-size: 11px; line-height: 1.6; color: #555; text-align: center;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  nav.nav-bar { height: 76px; padding: 0 16px; }
  .nav-links { display: none; }
  .nav-ctas { gap: 6px; }
  .page-header { padding: 64px 20px 32px; }
  .page-header h1 { font-size: 24px; line-height: 32px; letter-spacing: -0.96px; }
  .section-white, .section-soft, .section-dark { padding: 64px 20px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
  .service-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .client-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .form-row { flex-direction: column; gap: 0; }
  .article-card { flex-direction: column; }
  .article-card .thumb { width: 100%; height: 180px; }
  .footer-inner { flex-direction: column; }
  .footer-links { gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .article-detail-wrap .article-title { font-size: 22px; line-height: 28px; }
}