/* ============================================================
   Flashwise — Articles
   Shared styles for /articles/ and each post page.
   Tokens, header, buttons and footer mirror index.html so the
   pages read as part of the same site: type-led, hairlines,
   frames only around images.
   ============================================================ */

:root{
  --paper:#F3F2EE;
  --surface:#FBFAF7;
  --sunk:#EAE8E2;
  --line:#D9D6CD;
  --line-strong:#B9B5AA;

  --ink:#141413;
  --ink-2:#3B3A36;
  --muted:#77756E;

  --accent:#FF5A1F;
  --accent-ink:#D9420C;
  --accent-soft:#FFE4D8;

  --night:#141413;
  --night-line:#2E2D2A;
  --night-muted:#8F8C83;

  --r:4px;

  --font-display:'Inter Tight', 'Inter', ui-sans-serif, system-ui, sans-serif;
  --font-body:'Inter', ui-sans-serif, system-ui, sans-serif;
  --font-mono:'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  --container:1240px;
  --gutter:clamp(16px, 4vw, 48px);
}

*{margin:0; padding:0; box-sizing:border-box;}
html{scroll-behavior:smooth; overflow-x:hidden; overflow-x:clip; max-width:100%;}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden; overflow-x:clip;
  max-width:100%;
  min-height:100vh;
  display:flex; flex-direction:column;
}
main{ flex:1 0 auto; }
img,svg{display:block;}
a{color:inherit; text-decoration:none;}
ul{list-style:none;}
button{font-family:inherit;}
::selection{ background:var(--accent-soft); color:var(--ink); }

a:focus-visible, button:focus-visible{ outline:2px solid var(--accent); outline-offset:3px; }

.wrap{ max-width:var(--container); margin:0 auto; padding:0 var(--gutter); }

.eyebrow{
  font-family:var(--font-mono); font-size:12px; font-weight:500;
  letter-spacing:0.08em; text-transform:uppercase;
  color:var(--muted);
  display:inline-flex; align-items:center; gap:10px;
}

h1,h2,h3{ font-family:var(--font-display); font-weight:500; letter-spacing:-0.025em; color:var(--ink); }

.icon{width:18px; height:18px; stroke:currentColor; fill:none; stroke-width:1.6; stroke-linecap:round; stroke-linejoin:round; flex-shrink:0;}

/* ---------------- Buttons ---------------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:10px;
  font-family:var(--font-body); font-weight:500; font-size:15px;
  padding:13px 20px;
  border-radius:var(--r);
  border:1px solid transparent;
  cursor:pointer;
  transition:background .15s ease, border-color .15s ease;
  white-space:nowrap;
}
.btn-primary{ background:var(--ink); color:#fff; }
.btn-primary:hover{ background:#000; }
.btn-ghost{ background:transparent; color:var(--ink); border-color:var(--line-strong); }
.btn-ghost:hover{ border-color:var(--ink); }

/* ---------------- Nav ---------------- */
body > header{
  position:sticky; top:0; z-index:50;
  height:64px;
  background:rgba(243,242,238,0.88);
  backdrop-filter:blur(12px); -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
body > header .wrap{ max-width:none; height:100%; }
body > header nav{ display:grid; grid-template-columns:1fr auto 1fr; align-items:center; height:100%; }
.brand{ display:flex; align-items:center; gap:10px; font-family:var(--font-display); font-weight:600; font-size:18px; letter-spacing:-0.02em; }
.brand-logo{ width:24px; height:24px; flex-shrink:0; }
.nav-links{ display:flex; align-items:center; gap:32px; }
.nav-links a{ font-family:var(--font-mono); font-size:12px; letter-spacing:0.08em; text-transform:uppercase; color:var(--ink-2); }
.nav-links a:hover, .nav-links a.active{ color:var(--ink); }
.nav-cta{ justify-self:end; }
.nav-cta .btn{ padding:9px 16px; font-size:14px; }

@media (max-width:880px){
  body > header nav{ grid-template-columns:1fr auto; }
  .nav-links{ display:none; }
}

/* ---------------- Footer ---------------- */
footer{ background:var(--night); padding:48px 0; }
footer .brand{ color:#fff; }
.foot-row{ display:flex; align-items:center; justify-content:space-between; flex-wrap:wrap; gap:18px; }
.foot-links{ display:flex; gap:32px; }
.foot-links a{ font-family:var(--font-mono); font-size:12px; letter-spacing:0.08em; text-transform:uppercase; color:#E7E5DF; display:flex; align-items:center; gap:8px; }
.foot-links a svg{ display:none; }
.foot-links a:hover{ color:var(--accent); }
.foot-copy{ font-family:var(--font-mono); font-size:11.5px; letter-spacing:0.06em; color:var(--night-muted); }

/* ---------------- Shared page head ---------------- */
.page-head{ padding:clamp(64px, 11vh, 128px) 0 clamp(36px, 6vh, 64px); }
.page-head .eyebrow{ margin-bottom:24px; }
.page-head h1{ font-size:clamp(44px, 7vw, 96px); line-height:0.98; letter-spacing:-0.035em; margin-bottom:24px; max-width:13ch; }
.page-head p{ color:var(--ink-2); font-size:clamp(17px, 1.6vw, 20px); max-width:46ch; }

.tag{
  display:inline-flex; align-items:center;
  font-family:var(--font-mono); font-size:11px; letter-spacing:.08em; text-transform:uppercase; color:var(--accent-ink);
  white-space:nowrap;
}
.meta{ display:flex; align-items:center; gap:14px; flex-wrap:wrap; }
.meta time{ font-family:var(--font-mono); font-size:12px; color:var(--muted); letter-spacing:.04em; text-transform:uppercase; }

/* ---------------- Articles grid (2 × 2, open, hairlines) ---------------- */
.articles{ padding:clamp(40px, 6vh, 72px) 0 clamp(64px, 10vh, 120px); }
.articles-grid{
  display:grid;
  grid-template-columns:repeat(2, minmax(0, 1fr));
  gap:56px 48px;
}
.article-card{
  position:relative;
  display:flex; flex-direction:column;
}
.article-card:hover h2{ text-decoration:underline; text-decoration-thickness:1px; text-underline-offset:5px; }
.article-card:hover .card-read{ color:var(--accent-ink); }
.article-card:hover .card-read svg{ transform:translateX(3px); }

.card-visual{
  aspect-ratio:16 / 9;
  position:relative;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r);
  display:flex; align-items:center; justify-content:center;
  overflow:hidden;
  margin-bottom:22px;
}
.card-visual img{ width:100%; height:100%; object-fit:cover; object-position:right top; }
.card-visual .mark{ width:72px; height:72px; }
.card-visual .graph{ width:min(64%, 260px); height:auto; }

.card-body{ display:flex; flex-direction:column; gap:10px; }
.card-body h2{ font-size:clamp(24px, 2.4vw, 32px); line-height:1.1; letter-spacing:-0.025em; }
.card-body p{
  color:var(--ink-2); font-size:16px; line-height:1.55; max-width:48ch;
  display:-webkit-box; -webkit-line-clamp:3; -webkit-box-orient:vertical; overflow:hidden;
}
.card-read{
  margin-top:6px;
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--font-mono); font-size:12px; letter-spacing:.08em; text-transform:uppercase; color:var(--ink);
  transition:color .15s ease;
}
.card-read svg{ width:15px; height:15px; transition:transform .15s ease; }
.article-card > a.card-link{ position:absolute; inset:0; z-index:1; }

.article-card.placeholder{
  color:var(--muted);
  justify-content:flex-start;
}
.article-card.placeholder:hover h2{ text-decoration:none; }
.article-card.placeholder .tag{ color:var(--muted); margin-bottom:10px; }
.article-card.placeholder p{ font-size:16px; }

@media (max-width:720px){
  .articles-grid{ grid-template-columns:1fr; gap:44px; }
  .card-body p{ -webkit-line-clamp:4; }
}

/* ---------------- Post page ---------------- */
.post{ padding:clamp(40px, 6vh, 72px) 0 clamp(64px, 10vh, 120px); }
.post-wrap{ max-width:760px; margin:0 auto; padding:0 var(--gutter); }
.back-link{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--font-mono); font-size:12px; letter-spacing:.08em; text-transform:uppercase; color:var(--ink-2);
  margin-bottom:40px;
}
.back-link svg{ width:15px; height:15px; transform:rotate(180deg); }
.back-link:hover{ color:var(--ink); }

.post-head{ margin-bottom:40px; }
.post-head .meta{ margin-bottom:20px; }
.post-head h1{ font-size:clamp(36px, 5.4vw, 64px); line-height:1.02; letter-spacing:-0.035em; }
.post-head .lede{ color:var(--ink-2); font-size:19px; margin-top:18px; }

.post-body{ font-size:18px; line-height:1.72; color:var(--ink); }
.post-body p{ margin-bottom:24px; }
.post-body p:last-child{ margin-bottom:0; }
.post-body strong{ font-weight:600; }
.post-body a{ color:var(--ink); text-decoration:underline; text-decoration-color:var(--accent); text-underline-offset:3px; }
.post-body a:hover{ color:var(--accent-ink); }

.post-body ul.qs{ margin:0 0 24px; padding:0; }
.post-body ul.qs li{
  display:flex; align-items:flex-start; gap:14px;
  padding:8px 0;
  font-size:17px; line-height:1.5;
}
.post-body ul.qs li svg{ width:17px; height:17px; margin-top:4px; stroke:var(--accent); }

.post-body blockquote{
  margin:0 0 24px;
  padding:4px 0 4px 22px;
  border-left:2px solid var(--accent);
  color:var(--ink);
  font-size:18px;
}
.post-body blockquote p{ margin:0; }
.post-body .quote-from{
  display:flex; align-items:center; gap:8px;
  font-family:var(--font-mono); font-size:12px; letter-spacing:.04em; color:var(--muted);
  margin-bottom:8px;
}

.post-body .big{ font-family:var(--font-display); font-size:clamp(26px, 3.2vw, 36px); font-weight:500; line-height:1.15; letter-spacing:-0.025em; margin-bottom:28px; }

.post-body figure{ margin:8px 0 32px; }
.post-body figure img{
  width:100%; height:auto;
  border:1px solid var(--line); border-radius:var(--r);
  background:#fff;
}
.post-body figcaption{ margin-top:10px; font-family:var(--font-mono); font-size:12px; letter-spacing:.02em; color:var(--muted); line-height:1.5; }

.post-foot{
  margin-top:64px;
  display:grid; grid-template-columns:1fr 1fr;
}
.post-nav{
  display:flex; flex-direction:column; gap:8px;
  padding:22px 24px 22px 0;
}
.post-nav + .post-nav{ padding:22px 0 22px 24px; }
.post-nav:hover strong{ text-decoration:underline; text-decoration-thickness:1px; text-underline-offset:4px; }
.post-nav.next{ text-align:right; align-items:flex-end; }
.post-nav span{ font-family:var(--font-mono); font-size:11.5px; color:var(--muted); letter-spacing:.08em; text-transform:uppercase; }
.post-nav strong{ font-family:var(--font-display); font-size:20px; font-weight:500; letter-spacing:-0.02em; line-height:1.25; }
.post-nav.empty{ visibility:hidden; }
.post-all{ margin-top:28px; }
.post-all a{ display:inline-flex; align-items:center; gap:8px; font-family:var(--font-mono); font-size:12px; letter-spacing:.08em; text-transform:uppercase; color:var(--ink); }
.post-all a:hover{ color:var(--accent-ink); }

@media (max-width:560px){
  .post-foot{ grid-template-columns:1fr; }
  .post-nav, .post-nav + .post-nav{ padding:20px 0; }
  .post-nav.next{ text-align:left; align-items:flex-start; }
  .post-nav.empty{ display:none; }
  .post-body{ font-size:17px; }
}

/* ---------------- Reveal ---------------- */
.reveal{
  opacity:0;
  transform:translateY(36px);
  transition:opacity .9s cubic-bezier(.16,.84,.44,1), transform .9s cubic-bezier(.16,.84,.44,1);
}
.reveal.is-visible{ opacity:1; transform:translateY(0); }
.reveal-d1{ transition-delay:.06s; }
.reveal-d2{ transition-delay:.12s; }
.reveal-d3{ transition-delay:.18s; }

@media (prefers-reduced-motion: reduce){
  *{ animation-duration:0.001ms !important; animation-iteration-count:1 !important; scroll-behavior:auto !important; }
  .reveal{ opacity:1 !important; transform:none !important; transition:none !important; }
}