:root {
  --ground:      #F4F7FC;
  --plate:       #FFFFFF;
  --plate-2:     #F8FAFE;
  --ink:         #0C1A2B;
  --ink-2:       #46586E;
  --ink-3:       #7B8CA3;
  --rule:        #DCE4F0;
  --rule-soft:   #EBF0F8;

  --accent:      #1554F0;
  --accent-deep: #0B3FC4;
  --accent-ink:  #FFFFFF;
  --accent-soft: #E9EFFE;
  --accent-line: #BBD0FC;

  --c-1: #3B6CBF;
  --c-2: #B47825;
  --c-3: #0C6944;
  --c-4: #BC6ECE;
  --c-5: #C74C3D;

  --grid-line: rgba(12,26,43,.07);
  --shadow-sm: 0 1px 2px rgba(12,26,43,.05);
  --shadow:    0 1px 2px rgba(12,26,43,.04), 0 12px 28px -14px rgba(12,26,43,.22);
  --shadow-lg: 0 2px 4px rgba(12,26,43,.04), 0 24px 56px -20px rgba(21,84,240,.22);

  --r-sm: 8px;
  --r:    12px;
  --r-lg: 18px;
  --r-pill: 999px;

  --sans: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;

  --fs-label: .6875rem;
  --fs-sm:    .875rem;
  --fs-body:  1.0625rem;
  --fs-lede:  clamp(1.0625rem, 1.5vw, 1.25rem);
  --fs-h2:    clamp(1.75rem, 3vw, 2.4rem);
  --fs-h1:    clamp(2.4rem, 4.6vw, 3.9rem);

  --gut: clamp(1.25rem, 4vw, 3.25rem);
  --maxw: 1180px;
}

*, *::before, *::after { box-sizing: border-box; }
body {
  margin: 0; background: var(--ground); color: var(--ink);
  font-family: var(--serif); font-size: var(--fs-body); line-height: 1.65;
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
h1, h2, h3, .u-sans { font-family: var(--sans); font-variation-settings: "wdth" 108; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding-inline: var(--gut); }

.masthead {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--ground) 86%, transparent);
  backdrop-filter: blur(16px) saturate(1.4);
  border-bottom: 1px solid var(--rule);
}
.masthead .wrap { display: flex; align-items: center; gap: 1.25rem; min-height: 68px; }
.brand { display: inline-flex; align-items: center; gap: .65rem; text-decoration: none; margin-right: auto; }
.brand-mark { display: block; width: auto; height: 27px; flex: none; }
.brand-name {
  font-family: var(--sans); font-variation-settings: "wdth" 116; font-weight: 700;
  font-size: .82rem; letter-spacing: .12em; text-transform: uppercase; line-height: 1;
}
.nav { display: flex; align-items: center; gap: 1.6rem; }
.nav a {
  font-family: var(--sans); font-size: .875rem; font-weight: 500;
  color: var(--ink-2); text-decoration: none; padding: .4rem 0; position: relative;
}
.nav a:hover { color: var(--ink); }
@media (max-width: 900px) { .nav { display: none; } }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  font-family: var(--sans); font-weight: 600; font-size: .875rem;
  padding: .8rem 1.3rem; text-decoration: none; cursor: pointer;
  border: 1px solid var(--accent); background: var(--accent); color: var(--accent-ink);
  border-radius: var(--r-pill);
  box-shadow: 0 1px 2px rgba(11,63,196,.2), 0 8px 20px -10px rgba(21,84,240,.5);
  transition: transform .18s cubic-bezier(.2,.7,.3,1), box-shadow .18s ease, background .18s ease;
}
.btn:hover { background: var(--accent-deep); border-color: var(--accent-deep); transform: translateY(-1px); }
.btn--sm { padding: .55rem 1rem; font-size: .8125rem; }
.btn--quiet { background: var(--plate); color: var(--ink); border-color: var(--rule); box-shadow: var(--shadow-sm); }
.btn--quiet:hover { background: var(--plate); border-color: var(--accent-line); color: var(--accent-deep); }
.nav-cta {
  font-family: var(--sans); font-size: .875rem; font-weight: 600;
  color: var(--accent-deep); text-decoration: underline; text-underline-offset: 3px;
  white-space: nowrap;
}
.nav-cta:hover { color: var(--ink); }

/* ---- blog index ---- */
.blog-head { padding-block: clamp(2.5rem, 5vw, 4rem) clamp(1.5rem, 3vw, 2rem); }
.blog-head h1 {
  font-size: clamp(1.9rem, 3.6vw, 2.8rem); font-weight: 700; font-variation-settings: "wdth" 106;
  letter-spacing: -.028em; line-height: 1.05; margin: 0 0 .8rem; max-width: 18ch; text-wrap: balance;
}
.blog-head .lede { font-size: clamp(1.0625rem, 1.4vw, 1.15rem); color: var(--ink-2); max-width: 56ch; margin: 0; }

.blog-grid { display: grid; gap: 1.1rem; padding-block: 1rem clamp(3rem, 6vw, 5rem); }
.post-card {
  display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: .5rem 1.5rem; align-items: start;
  background: var(--plate); border: 1px solid var(--rule); border-radius: var(--r-lg);
  padding: 1.4rem 1.6rem; text-decoration: none; color: inherit;
  transition: transform .2s cubic-bezier(.2,.7,.3,1), box-shadow .2s ease, border-color .2s ease;
}
.post-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: var(--accent-line); }
.post-card.featured {
  grid-template-columns: 1fr; border-color: var(--accent); box-shadow: var(--shadow-lg);
  padding: 1.9rem 2rem;
}
@media (max-width: 480px) { .post-card.featured { padding: 1.5rem 1.4rem; } }
.post-card .meta {
  display: flex; align-items: center; gap: .5rem; margin: 0 0 .5rem; flex-wrap: nowrap;
  font-family: var(--sans); font-size: .72rem; font-weight: 600; letter-spacing: .04em; text-transform: none;
  color: var(--ink-3); white-space: nowrap; overflow: hidden;
}
.post-card .pill {
  color: var(--accent-deep); flex: none;
}
.post-card .pill::after { content: "\00b7"; margin-left: .5rem; color: var(--rule); font-weight: 400; }
.post-card .flag {
  color: var(--accent); flex: none;
}
.post-card .flag::after { content: "\00b7"; margin-left: .5rem; color: var(--rule); font-weight: 400; }
.post-card .date { flex: none; overflow: hidden; text-overflow: ellipsis; }
.post-card h2, .post-card h3 {
  margin: 0 0 .4rem; font-weight: 700; font-variation-settings: "wdth" 106; letter-spacing: -.014em;
  line-height: 1.2;
}
.post-card h2 { font-size: 1.55rem; max-width: 32ch; }
.post-card h3 { font-size: 1.15rem; max-width: 30ch; }
.post-card p { margin: 0; color: var(--ink-2); font-size: .98rem; max-width: 60ch; }
.post-card .arrow { color: var(--accent-deep); font-family: var(--sans); font-weight: 600; font-size: 1.3rem; align-self: center; }
@media (max-width: 640px) { .post-card { grid-template-columns: 1fr; } .post-card .arrow { display: none; } }

/* ---- article page ---- */
.article-head { padding-block: clamp(2rem, 5vw, 3.5rem) clamp(1.25rem, 3vw, 2rem); }
.article-head .back {
  display: inline-flex; align-items: center; gap: .4rem; font-family: var(--sans);
  font-size: .8125rem; font-weight: 600; color: var(--ink-2); text-decoration: none; margin-bottom: 1.4rem;
}
.article-head .back:hover { color: var(--accent-deep); }
.article-head .meta {
  display: flex; align-items: center; gap: .5rem; margin: 0 0 1rem; flex-wrap: wrap;
  font-family: var(--sans); font-size: .78rem; font-weight: 600; letter-spacing: .02em; text-transform: none;
  color: var(--ink-3);
}
.article-head .pill { color: var(--accent-deep); }
.article-head .pill::after { content: "\00b7"; margin-left: .5rem; color: var(--rule); font-weight: 400; }
.article-head .date { font-weight: 500; }
.article-head h1 {
  font-size: clamp(1.9rem, 3.6vw, 2.6rem); font-weight: 700; font-variation-settings: "wdth" 108;
  letter-spacing: -.026em; line-height: 1.08; margin: 0 0 1rem; max-width: 20ch; text-wrap: balance;
}
.article-head .dek { font-size: clamp(1.0625rem, 1.4vw, 1.2rem); color: var(--ink-2); max-width: 58ch; margin: 0; }

.article-body { padding-block: 0 clamp(2.5rem, 5vw, 4rem); max-width: 720px; }
.article-body h2 {
  font-size: 1.5rem; font-weight: 700; font-variation-settings: "wdth" 106; letter-spacing: -.016em;
  line-height: 1.2; margin: 2.4rem 0 1rem; text-wrap: balance;
}
.article-body h3 {
  font-size: 1.15rem; font-weight: 700; font-variation-settings: "wdth" 106; letter-spacing: -.01em;
  margin: 1.8rem 0 .7rem;
}
.article-body p { margin: 0 0 1.15rem; max-width: 68ch; }
.article-body ul { margin: 0 0 1.15rem; padding-left: 1.3rem; max-width: 68ch; }
.article-body li { margin-bottom: .5rem; }
.article-body strong { font-weight: 700; color: var(--ink); }
.article-body em { font-style: italic; }
.article-body a { color: var(--accent-deep); text-decoration: underline; text-decoration-color: var(--accent-line); text-underline-offset: 2px; }
.article-body a:hover { text-decoration-color: var(--accent-deep); }
.article-body blockquote {
  margin: 1.6rem 0; padding: 1rem 1.3rem; border-left: 3px solid var(--accent);
  background: var(--accent-soft); font-size: 1.05rem; color: var(--ink); max-width: 64ch;
  font-style: italic;
}

.article-cta {
  margin-top: clamp(2rem, 5vw, 3rem); background: var(--ink); color: #fff; border-radius: var(--r-lg);
  padding: clamp(1.6rem, 4vw, 2.4rem); display: flex; flex-wrap: wrap; align-items: center;
  justify-content: space-between; gap: 1.25rem; box-shadow: var(--shadow-lg);
}
.article-cta h3 { color: #fff; margin: 0; font-size: 1.2rem; font-weight: 700; }
.article-cta p { margin: .3rem 0 0; color: rgba(255,255,255,.72); font-size: .95rem; }
.article-cta .btn { background: #fff; color: var(--ink); border-color: #fff; box-shadow: none; }
.article-cta .btn:hover { background: var(--accent-soft); border-color: var(--accent-soft); color: var(--accent-deep); }

.article-more { border-top: 1px solid var(--rule-soft); padding-block: clamp(2rem, 4vw, 3rem); }
.article-more p.eyebrow-2 {
  font-family: var(--sans); font-size: .7rem; font-weight: 600; letter-spacing: .1em;
  text-transform: uppercase; color: var(--ink-3); margin: 0 0 1rem;
}

.foot { border-top: 1px solid var(--rule); padding-block: 2rem 2.5rem; }
.foot .wrap {
  display: flex; flex-wrap: wrap; gap: .6rem 2rem; align-items: center; justify-content: space-between;
  font-family: var(--sans); font-size: .8rem; color: var(--ink-3);
}
.foot a { text-decoration: none; }
.foot a:hover { color: var(--accent-deep); }