/* DeepDive · information-architecture pages (entry / category / archive)
   Layout + typography only. Banner visuals live in banners.css.
   Colour tokens come from ../colors_and_type.css; nothing here hardcodes a
   palette value so light mode falls out of [data-mode="light"] for free. */

.dd-ia {
  margin: 0;
  background: var(--bg);
  color: var(--fg-dim);
  font-family: var(--serif, "EB Garamond", "Noto Serif SC", Georgia, serif);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

.ia-wrap { max-width: 1080px; margin: 0 auto; padding: 0 5vw; }
@media (min-width: 1024px) { .ia-wrap { padding: 0 40px; } }

/* ---------- top bar ---------- */
.ia-top { border-bottom: 1px solid var(--line); }
.ia-top-row {
  display: flex; align-items: center; gap: 16px;
  padding: 14px 5vw; justify-content: space-between;
}
@media (min-width: 1024px) { .ia-top-row { padding: 14px 40px; } }
.ia-crumb {
  font-family: var(--mono, "JetBrains Mono", ui-monospace, monospace);
  font-size: 11px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--fg-mute);
}
.ia-crumb a { color: var(--fg-mute); text-decoration: none; }
.ia-crumb a:hover { color: var(--accent); }
.ia-crumb strong { color: var(--fg); font-weight: 500; }
.ia-crumb span { opacity: .5; margin: 0 6px; }
.ia-mode {
  font-family: var(--mono, ui-monospace, monospace);
  font-size: 9px; letter-spacing: .18em; text-transform: uppercase;
  color: var(--fg-mute); background: transparent;
  border: 1px solid var(--line-bright, var(--line));
  padding: 4px 9px; cursor: pointer; transition: color .15s, border-color .15s;
}
.ia-mode:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- headings ---------- */
.ia-h1 {
  font-family: var(--display, Fraunces, Georgia, serif);
  font-weight: 300; font-size: clamp(34px, 6vw, 68px); line-height: 1.08;
  letter-spacing: -.015em; color: var(--fg); margin: 48px 0 0;
}
.ia-lede {
  font-size: clamp(15px, 1.9vw, 18px); color: var(--fg-dim);
  max-width: 62ch; margin: 20px 0 0;
}
.ia-lede a { color: var(--accent); text-decoration: none;
             border-bottom: 1px solid var(--accent-soft); }
.ia-lede a:hover { border-bottom-color: var(--accent); }
.ia-lede strong { color: var(--fg); font-weight: 500; }

.ia-sec {
  font-family: var(--mono, ui-monospace, monospace);
  font-size: 10px; letter-spacing: .22em; text-transform: uppercase;
  color: var(--accent); font-weight: 400;
  margin: 72px 0 20px; padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap;
}
.ia-sec-d { color: var(--fg-mute); letter-spacing: .1em; text-transform: none; }
.ia-sec-d a { color: var(--fg-mute); text-decoration: none; }
.ia-sec-d a:hover { color: var(--accent); }

/* ---------- category grid (entry page) ---------- */
.cat-grid {
  display: grid; grid-template-columns: 1fr; gap: 1px;
  background: var(--line); border: 1px solid var(--line);
}
@media (min-width: 680px)  { .cat-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .cat-grid { grid-template-columns: repeat(3, 1fr); } }

/* ---------- storyline list ---------- */
.sl-list { list-style: none; margin: 0; padding: 0;
           border-top: 1px solid var(--line); }
.sl-list li { border-bottom: 1px solid var(--line); }
.sl-list a {
  display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap;
  padding: 13px 4px; text-decoration: none; color: var(--fg-dim);
  transition: background .15s, color .15s;
}
.sl-list a:hover { background: var(--accent-soft); color: var(--fg); }
.sl-id {
  font-family: var(--mono, ui-monospace, monospace); font-size: 10px;
  letter-spacing: .14em; color: var(--accent); flex: none; min-width: 4.5em;
}
.sl-t { flex: 1 1 18ch; font-size: 15px; }
.sl-n {
  font-family: var(--mono, ui-monospace, monospace); font-size: 10px;
  color: var(--fg-mute); flex: none;
}

/* ---------- article lists ---------- */
.ia-list { list-style: none; margin: 0; padding: 0;
           border-top: 1px solid var(--line); }
.ia-item { border-bottom: 1px solid var(--line); padding: 18px 4px; }
.ia-item-t {
  font-family: var(--display, Fraunces, Georgia, serif);
  font-size: clamp(17px, 2.1vw, 20px); line-height: 1.35;
  color: var(--fg); text-decoration: none; font-weight: 400;
}
.ia-item-t:hover { color: var(--accent); }
.ia-item-m {
  font-family: var(--mono, ui-monospace, monospace); font-size: 10px;
  letter-spacing: .12em; color: var(--fg-mute);
  margin-top: 7px; display: flex; gap: 12px; align-items: center; flex-wrap: wrap;
}
.ia-tag { color: var(--accent); }
.ia-item-b { margin: 8px 0 0; font-size: 14.5px; color: var(--fg-dim);
             max-width: 78ch; line-height: 1.7; }

/* ---------- category page ---------- */
.ia-sub { margin-top: 56px; }
.ia-sub-h {
  font-family: var(--mono, ui-monospace, monospace);
  font-size: 11px; letter-spacing: .2em; text-transform: uppercase;
  color: var(--fg); font-weight: 500;
  margin: 0 0 4px; padding-bottom: 10px;
  display: flex; align-items: baseline; gap: 10px;
  border-bottom: 1px solid var(--line-bright, var(--line));
}
.ia-sub-n { color: var(--fg-mute); font-size: 10px; }

.cat-nav {
  margin: 88px 0 0; padding: 26px 0 0; border-top: 1px solid var(--line);
  display: flex; gap: 10px 22px; flex-wrap: wrap; align-items: center;
}
.cat-nav-l {
  font-family: var(--mono, ui-monospace, monospace); font-size: 10px;
  letter-spacing: .2em; text-transform: uppercase; color: var(--fg-mute);
  width: 100%;
}
.cat-nav a {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 14px; color: var(--fg-dim); text-decoration: none;
}
.cat-nav a:hover { color: var(--fg); }
.cat-nav .dot {
  width: 7px; height: 7px; flex: none;
  background: var(--cat-accent, var(--accent));
}

/* ---------- footer ---------- */
.ia-foot {
  margin-top: 96px; border-top: 1px solid var(--line); padding: 26px 0 60px;
  font-family: var(--mono, ui-monospace, monospace); font-size: 11px;
  letter-spacing: .1em; color: var(--fg-mute);
}
.ia-foot a { color: var(--fg-mute); text-decoration: none; }
.ia-foot a:hover { color: var(--accent); }

/* CJK is never italic in this system */
:lang(zh), :lang(zh-Hans), .dd-ia em, .dd-ia i { font-style: normal; }