/* Inter font loaded via <link> in HTML for better performance */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 17px; -webkit-font-smoothing: antialiased; scroll-behavior: smooth; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
  background: #ffffff;
  color: #1d1d1f;
  line-height: 1.65;
}

/* ---- NAV ---- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 0 44px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255,255,255,0.88);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
}
.nav-home {
  display: flex;
  align-items: center;
  gap: 9px;
  text-decoration: none;
  color: #1d1d1f;
}
.nav-home img { width: 26px; height: 26px; border-radius: 6px; object-fit: contain; }
.nav-home-text { font-size: 15px; font-weight: 700; letter-spacing: -0.02em; }

.nav-back {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 13px;
  font-weight: 500;
  color: #0071e3;
  text-decoration: none;
  transition: opacity 0.15s;
}
.nav-back:hover { opacity: 0.72; }
.nav-back svg { width: 13px; height: 13px; }

/* ---- HERO ---- */
.post-hero {
  padding: 60px 44px 0;
  max-width: 780px;
  margin: 0 auto;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}
.post-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: #0071e3;
  background: rgba(0,113,227,0.07);
  border: 1px solid rgba(0,113,227,0.18);
  border-radius: 99px;
  padding: 3px 11px;
}
.post-date { font-size: 12px; color: #86868b; }

.post-title {
  font-size: clamp(34px, 5vw, 54px);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.05;
  color: #1d1d1f;
  margin-bottom: 20px;
}

.post-lead {
  font-size: 20px;
  font-weight: 300;
  color: #515154;
  line-height: 1.55;
  letter-spacing: -0.01em;
  margin-bottom: 36px;
  padding-bottom: 36px;
  border-bottom: 1px solid rgba(0,0,0,0.07);
}

/* ---- AUTHOR ---- */
.post-author {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 48px;
}
.post-author-avatar {
  width: 38px; height: 38px;
  border-radius: 50%;
  background: #0071e3;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.03em;
  flex-shrink: 0;
}
.post-author-name { font-size: 14px; font-weight: 600; color: #1d1d1f; line-height: 1.2; }
.post-author-role { font-size: 12px; color: #86868b; }

/* ---- FEATURE IMAGE ---- */
.post-image-wrap {
  max-width: 900px;
  margin: 0 auto 60px;
  padding: 0 44px;
}
.post-image {
  width: 100%;
  border-radius: 20px;
  box-shadow: 0 12px 48px rgba(0,0,0,0.10), 0 2px 8px rgba(0,0,0,0.05);
  display: block;
  border: 1px solid rgba(0,0,0,0.05);
}
.post-image-caption {
  text-align: center;
  font-size: 12px;
  color: #86868b;
  margin-top: 12px;
  letter-spacing: 0.01em;
}

/* ---- ARTICLE BODY ---- */
.post-body {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 35px 35px;
}

.post-body p {
  font-size: 17px;
  line-height: 1.75;
  color: #1d1d1f;
  margin-bottom: 24px;
  letter-spacing: -0.005em;
}

.post-body .lead-statement {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: #0071e3;
  line-height: 1.4;
  margin-bottom: 32px;
  padding: 24px 28px;
  background: rgba(0,113,227,0.04);
  border-left: 3px solid #0071e3;
  border-radius: 0 12px 12px 0;
}

.post-body h2 {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: #1d1d1f;
  margin-top: 48px;
  margin-bottom: 16px;
  line-height: 1.2;
}

.post-body .key-point {
  margin-bottom: 28px;
  padding: 20px 24px;
  background: #f5f5f7;
  border-radius: 14px;
}

.post-body .key-point-title {
  font-size: 15px;
  font-weight: 700;
  color: #1d1d1f;
  margin-bottom: 8px;
  letter-spacing: -0.015em;
}

.post-body .key-point p {
  font-size: 15px;
  margin-bottom: 0;
  color: #515154;
}

.post-body .insight {
  font-size: 18px;
  font-style: italic;
  font-weight: 300;
  color: #515154;
  border-top: 1px solid rgba(0,0,0,0.08);
  border-bottom: 1px solid rgba(0,0,0,0.08);
  padding: 28px 0;
  margin: 36px 0;
  letter-spacing: -0.01em;
  line-height: 1.6;
}

/* ---- FOOTER ---- */
.post-footer {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 44px 80px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.post-footer-divider { height: 1px; background: rgba(0,0,0,0.08); }

.post-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.post-cta-text { font-size: 14px; color: #86868b; }
.post-cta-text strong { color: #1d1d1f; font-weight: 600; }

.post-cta-links { display: flex; gap: 10px; }
.post-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: 99px;
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.15s ease;
  letter-spacing: -0.01em;
  font-family: inherit;
}
.post-cta-btn--primary { background: #0071e3; color: #fff; }
.post-cta-btn--primary:hover { background: #0077ed; }
.post-cta-btn--outline { background: transparent; border: 1px solid rgba(0,0,0,0.1); color: #515154; }
.post-cta-btn--outline:hover { background: #f5f5f7; }
.post-cta-btn svg { width: 13px; height: 13px; }

.post-back-home { text-align: center; }
.post-back-link {
  font-size: 13px;
  color: #0071e3;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.post-back-link:hover { opacity: 0.72; }

/* ---- RESPONSIVE ---- */
@media (max-width: 680px) {
  .nav { padding: 0 20px; }
  .post-hero { padding: 40px 20px 0; }
  .post-image-wrap { padding: 0 20px; }
  .post-body { padding: 0 20px 60px; }
  .post-footer { padding: 0 20px 60px; }
  .post-cta { flex-direction: column; }
  .post-title { font-size: 32px; }
}