/* =========================================================
   Keystone Markets — Shared blog stylesheet
   Mirrors landing page design tokens for visual consistency.
   ========================================================= */

:root{
  --logo-url: url('/assets/keystone-logo.svg');

  /* Brand palette — per Brand Guidelines V1.0 */
  --bg:              #0D0F14;
  --bg-elev:         #13161D;
  --bg-elev-2:       #1A1E27;
  --graphite:        #2A2F3A;
  --steel:           #8A9199;
  --steel-soft:      #6B7078;
  --off-white:       #F5F6F7;
  --white:           #FFFFFF;
  --teal:            #14B8A6;
  --teal-soft:       #0E8A7C;
  --teal-glow:       rgba(20, 184, 166, 0.18);
  --green:           #22C55E;

  --border:          rgba(138, 145, 153, 0.14);
  --border-strong:   rgba(138, 145, 153, 0.28);
  --ink:             var(--off-white);
  --ink-muted:       var(--steel);

  --serif:  'Fraunces', 'Times New Roman', Georgia, serif;
  --sans:   'Inter', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
  --mono:   'IBM Plex Mono', 'SF Mono', Menlo, monospace;

  --max:   1240px;
  --gutter: clamp(20px, 4vw, 40px);
}

*,*::before,*::after{ box-sizing: border-box; }

html{
  background: var(--bg);
  color: var(--ink);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}
body{
  margin: 0;
  font-family: var(--sans);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01", "cv11", "tnum";
  overflow-x: hidden;
}

::selection{ background: var(--teal); color: var(--bg); }
a{ color: inherit; text-decoration: none; }

/* ---------- Layout primitives ---------- */
.wrap{
  max-width: var(--max);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}
.section{
  padding: clamp(80px, 12vw, 160px) 0;
  position: relative;
}
.section--tight{ padding: clamp(56px, 8vw, 100px) 0; }

.eyebrow{
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--teal);
}
.eyebrow::before{
  content: "";
  width: 24px;
  height: 1px;
  background: var(--teal);
}

h1,h2,h3,h4{
  font-family: var(--serif);
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.02em;
  line-height: 1.08;
  margin: 0;
}
h2{ font-size: clamp(32px, 4.6vw, 56px); line-height: 1.1; }
h3{ font-size: clamp(22px, 2.4vw, 30px); line-height: 1.2; letter-spacing: -0.015em; }
p{ margin: 0; }

.lede{
  font-family: var(--sans);
  font-size: clamp(16px, 1.35vw, 19px);
  line-height: 1.6;
  color: var(--steel);
  max-width: 62ch;
  font-weight: 400;
}

/* ---------- Navigation ---------- */
.nav{
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  padding: 18px 0;
  background: rgba(13, 15, 20, 0.72);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s ease, background-color .3s ease;
}
.nav.is-scrolled{
  border-bottom-color: var(--border);
  background: rgba(13, 15, 20, 0.86);
}
.nav__inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}
.nav__logo{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  height: 38px;
}
.logo-img{
  display: block;
  width: 114px;
  height: 38px;
  background-image: var(--logo-url);
  background-repeat: no-repeat;
  background-size: contain;
  background-position: left center;
}
.logo-img--footer{
  width: 120px;
  height: 40px;
}
.nav__links{
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav__links a{
  font-size: 13.5px;
  color: var(--steel);
  transition: color .2s ease;
  letter-spacing: -0.005em;
}
.nav__links a:hover,
.nav__links a.is-active{ color: var(--ink); }
.nav__cta{
  font-size: 13.5px;
  padding: 9px 16px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  color: var(--ink);
  transition: border-color .2s ease, background-color .2s ease, color .2s ease;
}
.nav__cta:hover{
  border-color: var(--teal);
  color: var(--teal);
}
@media (max-width: 720px){
  .nav__links a:not(.nav__cta){ display: none; }
}

/* ---------- Buttons ---------- */
.btn{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.005em;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .25s ease, background-color .25s ease, border-color .25s ease, color .25s ease, box-shadow .25s ease;
  font-family: var(--sans);
}
.btn--primary{ background: var(--off-white); color: var(--bg); }
.btn--primary:hover{ background: var(--teal); color: var(--bg); box-shadow: 0 10px 40px -10px var(--teal); }
.btn--ghost{ background: transparent; color: var(--ink); border-color: var(--border-strong); }
.btn--ghost:hover{ border-color: var(--teal); color: var(--teal); }
.btn svg{ width: 14px; height: 14px; transition: transform .25s ease; }
.btn:hover svg{ transform: translateX(3px); }

/* ---------- Page header (shared by /blog and /blog/{slug}) ---------- */
.page-head{
  position: relative;
  padding-top: clamp(150px, 18vh, 200px);
  padding-bottom: clamp(40px, 6vw, 72px);
  overflow: hidden;
  isolation: isolate;
}
.page-head__bg{
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}
.page-head__bg::before{
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 800px;
  height: 800px;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle at center, var(--teal-glow), transparent 60%);
  filter: blur(20px);
}
.page-head__grid{
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(138,145,153,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(138,145,153,0.035) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}

.page-head__title{
  font-size: clamp(40px, 5.6vw, 72px);
  line-height: 1;
  letter-spacing: -0.035em;
  font-weight: 400;
  max-width: 16ch;
  margin: 24px 0 18px;
}
.page-head__title em{
  font-style: italic;
  font-weight: 300;
  color: var(--teal);
}
.page-head__sub{
  max-width: 60ch;
  font-size: clamp(15px, 1.25vw, 18px);
  color: var(--steel);
  line-height: 1.6;
}

/* ---------- Blog grid ---------- */
.blog-section{
  padding: clamp(20px, 4vw, 40px) 0 clamp(80px, 12vw, 140px);
}
.blog-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
@media (max-width: 980px){ .blog-grid{ grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px){ .blog-grid{ grid-template-columns: 1fr; } }

.post-card{
  display: flex;
  flex-direction: column;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 18px;
  overflow: hidden;
  transition: transform .3s ease, border-color .3s ease, background-color .3s ease, box-shadow .3s ease;
  cursor: pointer;
  height: 100%;
}
.post-card:hover{
  transform: translateY(-4px);
  border-color: var(--border-strong);
  background: var(--bg-elev-2);
  box-shadow: 0 20px 60px -30px rgba(0,0,0,0.6), 0 0 0 1px rgba(20,184,166,0.06);
}
.post-card__image{
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--graphite);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  position: relative;
  overflow: hidden;
}
.post-card__image::after{
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(13,15,20,0.4) 100%);
  pointer-events: none;
}
.post-card__body{
  padding: 24px 26px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}
.post-card__meta{
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel-soft);
}
.post-card__meta-dot{
  width: 3px; height: 3px; border-radius: 999px;
  background: var(--steel-soft);
}
.post-card__title{
  font-family: var(--serif);
  font-size: clamp(20px, 1.7vw, 24px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--ink);
  font-weight: 400;
  margin: 4px 0 0;
}
.post-card:hover .post-card__title{ color: var(--white); }
.post-card__desc{
  font-size: 14.5px;
  color: var(--steel);
  line-height: 1.55;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.post-card__cta{
  margin-top: auto;
  padding-top: 14px;
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 500;
  color: var(--teal);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.post-card__cta::after{
  content: "→";
  transition: transform .25s ease;
}
.post-card:hover .post-card__cta::after{ transform: translateX(4px); }

/* ---------- Empty / loading state ---------- */
.blog-empty{
  border: 1px dashed var(--border);
  border-radius: 18px;
  padding: 60px 32px;
  text-align: center;
  color: var(--steel);
  font-family: var(--sans);
  font-size: 14px;
  letter-spacing: 0.02em;
}
.blog-empty strong{ color: var(--ink); font-weight: 500; display: block; margin-bottom: 6px; font-family: var(--serif); font-size: 20px; letter-spacing: -0.01em; }

/* ---------- Single post ---------- */
.post-hero__image{
  width: 100%;
  aspect-ratio: 16 / 7;
  border-radius: 18px;
  background: var(--graphite);
  background-size: cover;
  background-position: center;
  margin: 32px 0 56px;
  border: 1px solid var(--border);
}
.post-meta-row{
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel-soft);
  margin-top: 12px;
}
.post-meta-row .dot{
  width: 3px; height: 3px; border-radius: 999px; background: var(--steel-soft);
}
.post-body{
  max-width: 70ch;
  margin: 0 auto;
  font-size: 17px;
  line-height: 1.75;
  color: var(--steel);
  font-family: var(--sans);
}
.post-body h2,
.post-body h3{ color: var(--ink); margin: 48px 0 16px; }
.post-body h2{ font-size: clamp(26px, 2.6vw, 34px); letter-spacing: -0.02em; }
.post-body h3{ font-size: clamp(20px, 1.9vw, 24px); }
.post-body p{ margin: 0 0 22px; }
.post-body p strong{ color: var(--ink); font-weight: 500; }
.post-body a{ color: var(--teal); border-bottom: 1px solid rgba(20,184,166,0.3); transition: border-color .2s ease; }
.post-body a:hover{ border-bottom-color: var(--teal); }
.post-body ul, .post-body ol{ margin: 0 0 22px; padding-left: 22px; }
.post-body li{ margin-bottom: 10px; }
.post-body img{ max-width: 100%; border-radius: 14px; border: 1px solid var(--border); margin: 28px 0; }
.post-body blockquote{
  margin: 28px 0;
  padding: 20px 26px;
  border-left: 2px solid var(--teal);
  background: var(--bg-elev);
  border-radius: 0 10px 10px 0;
  font-family: var(--serif);
  font-size: 18px;
  font-style: italic;
  color: var(--ink);
  line-height: 1.55;
}
.post-body code{
  font-family: var(--mono);
  font-size: 0.92em;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 5px;
  color: var(--ink);
}
.post-body pre{
  background: var(--bg-elev);
  border: 1px solid var(--border);
  padding: 18px 20px;
  border-radius: 12px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.6;
  margin: 24px 0;
}
.post-body pre code{ background: transparent; border: 0; padding: 0; }
.post-body hr{
  border: 0;
  border-top: 1px solid var(--border);
  margin: 40px 0;
}

.back-link{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel);
  transition: color .2s ease;
  margin-bottom: 8px;
}
.back-link:hover{ color: var(--teal); }
.back-link::before{ content: "←"; }

.post-footer-cta{
  margin-top: 80px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.post-footer-cta__label{
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel-soft);
}

/* ---------- Footer (mirror of landing page) ---------- */
.footer{
  border-top: 1px solid var(--border);
  padding: 80px 0 40px;
  background: var(--bg);
}
.footer__top{
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 56px;
}
.footer__brand{
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.footer__tagline{
  font-size: 14px;
  color: var(--steel);
  max-width: 38ch;
  line-height: 1.55;
}
.footer__col h4{
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink);
  margin: 0 0 18px;
}
.footer__col ul{
  list-style: none;
  padding: 0; margin: 0;
  display: grid; gap: 12px;
}
.footer__col a{
  font-size: 13.5px;
  color: var(--steel);
  transition: color .2s ease;
}
.footer__col a:hover{ color: var(--teal); }
.footer__bottom{
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel-soft);
}
.footer__bottom a:hover{ color: var(--teal); }
@media (max-width: 780px){
  .footer__top{ grid-template-columns: 1fr 1fr; }
  .footer__bottom{ flex-direction: column; align-items: flex-start; }
}

/* ---------- Reveal ---------- */
.reveal{ opacity: 0; transform: translateY(14px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-in{ opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce){
  *{ animation: none !important; transition: none !important; }
  .reveal{ opacity: 1; transform: none; }
}