/* ============================================================
   Blog — index + article page. Airwallex layout skeleton,
   Column/hi-daniel branding throughout (tokens.css is canon).
   ============================================================ */

.blog-main { padding-top: 120px; }

/* ---------- Index header ---------- */
.blog-head { max-width: 720px; margin-bottom: 40px; }
.blog-head h1 {
  font-size: clamp(38px, 4.6vw, 56px); line-height: 1.05;
  letter-spacing: -0.03em; margin-bottom: 14px;
}
.blog-head .section-sub { max-width: 520px; }

/* ---------- Category pills ---------- */
.blog-cats { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 40px; }
.blog-cat {
  font-family: var(--font-sans); font-size: 14px; font-weight: 500;
  color: var(--ink-soft); background: #fff;
  border: 1px solid var(--gray-100); border-radius: var(--radius-full);
  padding: 8px 18px; cursor: pointer;
  transition: all var(--dur-fast) var(--ease-out);
}
.blog-cat:hover { border-color: var(--gray-300); transform: translateY(-1px); }
.blog-cat.active {
  background: var(--navy); color: #fff; border-color: var(--navy);
  box-shadow: var(--shadow-btn);
}

/* ---------- Featured post ---------- */
.blog-featured {
  display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 0;
  background: #fff; border: 1px solid var(--gray-100);
  border-radius: 20px; overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin-bottom: 56px;
  transition: box-shadow var(--dur-med) var(--ease-out), transform var(--dur-med) var(--ease-out);
}
.blog-featured:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.bf-cover { position: relative; min-height: 340px; background: var(--gray-50); }
.bf-cover canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.bf-body { padding: 44px 48px; display: flex; flex-direction: column; }
.blog-chip {
  display: inline-flex; align-self: flex-start;
  font-size: 12px; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--chip, var(--seafoam-dark));
  background: color-mix(in srgb, var(--chip, var(--seafoam)) 10%, transparent);
  border-radius: var(--radius-full); padding: 5px 13px;
  margin-bottom: 18px;
}
.bf-body h2 {
  font-size: clamp(24px, 2.6vw, 32px); line-height: 1.18;
  letter-spacing: -0.02em; margin-bottom: 14px;
}
.bf-body p { font-size: 16px; color: var(--ink-soft); line-height: 1.6; margin-bottom: 26px; }
.blog-meta {
  margin-top: auto;
  display: flex; align-items: center; gap: 12px;
  font-size: 13px; color: var(--gray-400);
}
.blog-ava {
  width: 34px; height: 34px; border-radius: 50%;
  background: var(--navy); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 600;
}
.blog-meta b { color: var(--ink); font-weight: 500; }

/* ---------- Post grid ---------- */
.blog-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px;
  margin-bottom: 72px;
}
.blog-card {
  display: flex; flex-direction: column;
  background: #fff; border: 1px solid var(--gray-100);
  border-radius: 16px; overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--dur-med) var(--ease-out), transform var(--dur-med) var(--ease-out);
}
.blog-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); }
.blog-card.hidden { display: none; }
.bc-cover { position: relative; aspect-ratio: 16 / 9; background: var(--gray-50); }
.bc-cover canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.bc-body { padding: 22px 24px 24px; display: flex; flex-direction: column; flex: 1; }
.bc-body h3 { font-size: 18.5px; line-height: 1.3; letter-spacing: -0.01em; margin: 12px 0 8px; }
.blog-card:hover h3 { color: var(--navy); }
.bc-body p { font-size: 14px; color: var(--gray-500); line-height: 1.55; margin-bottom: 18px; }
.bc-body .blog-meta { font-size: 12.5px; }

/* ---------- Newsletter strip ---------- */
.blog-news {
  background: var(--navy); border-radius: 20px;
  padding: 44px 48px;
  display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 32px; align-items: center;
  margin-bottom: 24px;
}
.blog-news h3 { color: #fff; font-size: 24px; letter-spacing: -0.02em; margin-bottom: 8px; }
.blog-news p { color: rgba(255, 255, 255, 0.6); font-size: 15px; }
.bn-form { display: flex; gap: 10px; }
.bn-form input {
  flex: 1; font-family: var(--font-sans); font-size: 14.5px;
  color: #fff; background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius); padding: 12px 16px;
  outline: none;
  transition: border-color var(--dur-fast) var(--ease-out);
}
.bn-form input::placeholder { color: rgba(255, 255, 255, 0.4); }
.bn-form input:focus { border-color: var(--seafoam); }
.bn-form .btn-primary { background: var(--seafoam); }
.bn-form .btn-primary:hover { background: var(--seafoam-dark); }

/* ---------- Article page: hero ---------- */
.post-hero {
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px;
  align-items: center;
  margin-bottom: 104px;                 /* generous air before the article */
  padding-bottom: 48px;
  border-bottom: 1px solid var(--gray-100);
}
.ph-left h1 {
  font-size: clamp(30px, 3.6vw, 44px); line-height: 1.12;
  letter-spacing: -0.025em; margin: 16px 0 18px;
}
.ph-cover {
  position: relative; height: 300px;
  border-radius: 18px; overflow: hidden;
  background: var(--gray-50); border: 1px solid var(--gray-100);
}
.ph-cover canvas { position: absolute; inset: 0; width: 100%; height: 100%; }

/* ---------- Article page: body + sticky aside ---------- */
.post-layout {
  display: grid; grid-template-columns: minmax(0, 1fr) 316px; gap: 72px;
  align-items: start;
}
/* clears the 65px bar with a 7px breath */
.post-aside { position: sticky; top: 72px; }
.aside-card {
  background: #fff; border: 1px solid var(--gray-100);
  border-radius: 16px; padding: 22px 22px 20px;
  box-shadow: var(--shadow-sm);
  display: flex; flex-direction: column;
}
.aside-label {
  font-size: 11.5px; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--gray-400); margin-bottom: 12px;
}
.aside-div { height: 1px; background: var(--gray-100); margin: 18px 0; }

/* TOC: capped height so share/contact never get pushed out */
.toc { max-height: 30vh; overflow-y: auto; display: flex; flex-direction: column; gap: 2px; }
.toc a {
  position: relative;
  font-size: 13.5px; color: var(--gray-500); line-height: 1.4;
  padding: 7px 10px 7px 16px; border-radius: 8px;
  border-left: 2px solid var(--gray-100);
  transition: all var(--dur-fast) var(--ease-out);
}
.toc a:hover { color: var(--navy); background: rgba(17, 26, 74, 0.04); }
.toc a.active {
  color: var(--navy); font-weight: 500;
  border-left-color: var(--seafoam);
  background: rgba(68, 180, 139, 0.06);
}

.aside-related { display: flex; flex-direction: column; gap: 12px; }
.aside-related a b {
  display: block; font-size: 13.5px; font-weight: 500; color: var(--ink);
  line-height: 1.35; transition: color var(--dur-fast) var(--ease-out);
}
.aside-related a:hover b { color: var(--navy); text-decoration: underline; text-underline-offset: 3px; }
.aside-related a small { font-size: 11.5px; color: var(--gray-400); }

.aside-share { display: flex; align-items: center; justify-content: space-between; }
.aside-share .aside-label { margin-bottom: 0; }
.share-btns { display: flex; gap: 8px; }
.share-btns button {
  width: 34px; height: 34px; border-radius: 9px;
  font-family: var(--font-sans); font-size: 13px; font-weight: 600;
  color: var(--ink-soft); background: #fff;
  border: 1px solid var(--gray-100); cursor: pointer;
  transition: all var(--dur-fast) var(--ease-out);
}
.share-btns button:hover {
  color: var(--navy); border-color: var(--gray-300);
  transform: translateY(-1px); box-shadow: var(--shadow-sm);
}
.share-btns button.copied { color: var(--seafoam-dark); border-color: var(--seafoam); }
.aside-contact { justify-content: center; margin-top: 18px; }

/* ---------- Article page ---------- */
.post-progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0;
  background: linear-gradient(90deg, var(--seafoam), var(--color-sky-cyan));
  z-index: 100;
}
.post-wrap { max-width: 720px; margin: 0 auto; }
.post-crumb {
  font-size: 13.5px; color: var(--gray-400); margin-bottom: 26px;
  display: flex; gap: 8px; align-items: center;
}
.post-crumb a { color: var(--ink-soft); }
.post-crumb a:hover { color: var(--navy); }
.post-wrap h1 {
  font-size: clamp(32px, 4vw, 46px); line-height: 1.12;
  letter-spacing: -0.025em; margin: 16px 0 22px;
}
.post-cover {
  position: relative; height: 300px;
  border-radius: 18px; overflow: hidden;
  background: var(--gray-50); border: 1px solid var(--gray-100);
  margin: 36px 0 44px;
}
.post-cover canvas { position: absolute; inset: 0; width: 100%; height: 100%; }

.post-body { font-size: 17px; line-height: 1.75; color: var(--color-slate-ink); }
.post-body h2 {
  font-size: 26px; letter-spacing: -0.015em; color: var(--navy);
  margin: 44px 0 16px;
}
.post-body h3 { font-size: 20px; color: var(--navy); margin: 34px 0 12px; }
.post-body p { margin-bottom: 20px; }
.post-body ul { margin: 0 0 20px 22px; }
.post-body li { margin-bottom: 10px; }
.post-body blockquote {
  border-left: 3px solid var(--seafoam);
  padding: 4px 0 4px 22px; margin: 28px 0;
  font-size: 19px; line-height: 1.55; color: var(--navy);
}
.post-body blockquote footer { font-size: 13.5px; color: var(--gray-400); margin-top: 10px; }
.post-code {
  background: #0b1235; border-radius: var(--radius-lg);
  padding: 20px 22px; margin: 28px 0;
  font-family: var(--font-mono); font-size: 13px; line-height: 1.7;
  color: var(--color-seafoam-400);
  overflow-x: auto; white-space: pre;
}
.post-callout {
  display: flex; gap: 14px; align-items: flex-start;
  background: rgba(68, 180, 139, 0.07);
  border: 1px solid rgba(68, 180, 139, 0.25);
  border-radius: var(--radius-lg);
  padding: 18px 20px; margin: 28px 0;
  font-size: 15px;
}
.post-callout i { font-style: normal; color: var(--seafoam-dark); font-size: 17px; }

.post-foot {
  display: flex; justify-content: space-between; align-items: center;
  border-top: 1px solid var(--gray-100);
  margin-top: 52px; padding-top: 24px;
}

/* ---------- Related ---------- */
.post-related { max-width: 1200px; margin: 88px auto 0; }
.post-related h2 { font-size: 26px; letter-spacing: -0.02em; margin-bottom: 26px; }

@media (max-width: 960px) {
  .blog-featured { grid-template-columns: 1fr; }
  .bf-cover { min-height: 220px; }
  .blog-grid { grid-template-columns: 1fr; }
  .blog-news { grid-template-columns: 1fr; }
  .post-hero { grid-template-columns: 1fr; gap: 28px; }
  .ph-cover { height: 200px; }
  .post-layout { grid-template-columns: 1fr; gap: 40px; }
  .post-aside { position: relative; top: 0; }
}