/* writeup.css — shared styles for technical case-study pages */
:root {
  --mono: "JetBrains Mono", "Cascadia Code", Consolas, "Courier New", monospace;
  --sans: "Segoe UI", "Helvetica Neue", -apple-system, Arial, sans-serif;
}
[data-theme="dark"] {
  --bg: #0b0e13;      --bg-soft: #11151c;   --panel: #151a23;
  --border: #232b38;  --ink: #e6ebf2;       --muted: #a3adbd;
  --faint: #667082;   --accent: #f87171;
  --accent-dim: rgba(248,113,113,.13);
  --shadow: rgba(0,0,0,.5);
}
[data-theme="light"] {
  --bg: #f6f7f9;      --bg-soft: #ffffff;   --panel: #ffffff;
  --border: #dde1e8;  --ink: #1c2330;       --muted: #4c5565;
  --faint: #8b94a3;   --accent: #dc2626;
  --accent-dim: rgba(220,38,38,.10);
  --shadow: rgba(30,40,60,.12);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: var(--sans);
  background: var(--bg); color: var(--ink); line-height: 1.65;
  transition: background .3s, color .3s;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 48px 48px; background-attachment: fixed;
}
::selection { background: var(--accent-dim); }

nav {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 820px; margin: 0 auto; padding: .8rem 1.5rem;
  display: flex; justify-content: space-between; align-items: center;
}
.back {
  font-family: var(--mono); font-size: .85rem; font-weight: 600;
  color: var(--ink); text-decoration: none;
}
.back .prompt { color: var(--accent); }
.back:hover { color: var(--accent); }
.theme-toggle {
  font-family: var(--mono); font-size: .78rem;
  background: var(--panel); color: var(--muted);
  border: 1px solid var(--border); border-radius: 6px;
  padding: .35rem .7rem; cursor: pointer;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }

article { max-width: 820px; margin: 0 auto; padding: 2.4rem 1.5rem 4rem; }

.wu-path {
  font-family: var(--mono); font-size: .78rem;
  color: var(--faint); margin-bottom: .9rem;
}
.wu-path .dir { color: var(--accent); }
h1 { font-size: 1.9rem; font-weight: 700; letter-spacing: -.3px; margin-bottom: .6rem; }

.meta {
  font-family: var(--mono); font-size: .78rem; color: var(--muted);
  border: 1px solid var(--border); border-radius: 8px;
  background: var(--panel);
  padding: .55rem .9rem; margin: 1rem 0 1.2rem;
  display: flex; flex-wrap: wrap; gap: .4rem 1.4rem;
}
.meta b { color: var(--accent); font-weight: 600; }

.chips { display: flex; flex-wrap: wrap; gap: .45rem; margin-bottom: 1.6rem; }
.chip {
  font-family: var(--mono); font-size: .72rem;
  color: var(--accent); background: var(--accent-dim);
  border: 1px solid var(--border);
  padding: .15rem .55rem; border-radius: 99px;
}

h2 {
  font-family: var(--mono); font-size: .95rem; font-weight: 600;
  color: var(--accent); letter-spacing: .5px;
  margin: 2.1rem 0 .6rem;
}
h2::before { content: "## "; color: var(--faint); }
p  { color: var(--muted); font-size: .95rem; margin-bottom: .8rem; }
ul { margin: 0 0 .9rem 1.2rem; color: var(--muted); font-size: .95rem; }
li { margin-bottom: .35rem; }
strong { color: var(--ink); font-weight: 600; }
code {
  font-family: var(--mono); font-size: .85em;
  background: var(--accent-dim); color: var(--accent);
  padding: .1rem .35rem; border-radius: 4px;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.evidence {
  border: 1px dashed var(--border); border-radius: 8px;
  background: var(--bg-soft);
  font-family: var(--mono); font-size: .8rem; color: var(--faint);
  padding: 1.4rem 1rem; margin: .9rem 0; text-align: center;
}
.evidence.has-img { border-style: solid; padding: .6rem; text-align: left; }
.evidence img { width: 100%; border-radius: 5px; display: block; }
.evidence .cap { padding: .55rem .4rem .25rem; }
.private-note {
  border-left: 2px solid var(--accent);
  background: var(--accent-dim);
  padding: .6rem 1rem; margin: 1.2rem 0;
  font-size: .9rem; color: var(--muted); border-radius: 0 6px 6px 0;
}
footer {
  text-align: center; padding: 2rem 1rem;
  font-family: var(--mono); font-size: .75rem; color: var(--faint);
  border-top: 1px solid var(--border);
}