/* UO Solutions — research notebook visual system */
:root {
  --ink: #1c2420;
  --ink-soft: #4a5450;
  --paper: #fbfaf7;
  --paper-2: #f3f1ea;
  --accent: #0e4f3d;
  --accent-ink: #0a3a2d;
  --note: #8a5a12;
  --note-bg: #faf3e3;
  --warn: #9c1c1c;
  --warn-bg: #fdecec;
  --line: #d8d4c8;
  --w-article: 680px;
  --w-service: 760px;
  --w-home: 860px;
  --radius: 3px;
  --font: Georgia, "Iowan Old Style", "Times New Roman", serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* --- skip link & focus --- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: .6rem 1rem;
  z-index: 100;
}
.skip-link:focus { left: 0; }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* --- header --- */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}
.header-inner {
  max-width: var(--w-home);
  margin: 0 auto;
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: .6rem;
  text-decoration: none;
  color: var(--ink);
}
.brand img { display: block; }
.brand-name {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: .01em;
}
.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1.4rem;
}
.main-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: .95rem;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
}
.main-nav a:hover { color: var(--accent); border-bottom-color: var(--accent); }
.main-nav a[aria-current="page"] { color: var(--accent); border-bottom-color: var(--accent); }
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: .45rem .7rem;
  font-family: var(--font);
  font-size: .9rem;
  color: var(--ink);
  cursor: pointer;
}

/* --- layout widths --- */
.wrap-home { max-width: var(--w-home); margin: 0 auto; padding: 0 1.25rem; }
.wrap-service { max-width: var(--w-service); margin: 0 auto; padding: 0 1.25rem; }
.wrap-article { max-width: var(--w-article); margin: 0 auto; padding: 0 1.25rem; }
.wrap-narrow { max-width: 560px; margin: 0 auto; padding: 0 1.25rem; }

main { padding: 2.5rem 0 3.5rem; }

/* --- placeholder warning bar --- */
.placeholder-banner {
  background: var(--warn-bg);
  color: var(--warn);
  border-bottom: 2px solid var(--warn);
  padding: .65rem 1.25rem;
  font-size: .92rem;
  text-align: center;
}
.placeholder-banner strong { letter-spacing: .02em; }

/* --- disclosure strip (sensitive first screen) --- */
.disclosure-strip {
  border-left: 4px solid var(--accent);
  background: var(--paper-2);
  padding: .9rem 1.1rem;
  font-size: .95rem;
  color: var(--ink-soft);
  margin: 1.75rem 0 0;
}
.disclosure-strip p { margin: .25rem 0; }
.disclosure-strip .ds-label {
  display: block;
  font-size: .78rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: .3rem;
}

/* --- breadcrumb --- */
.breadcrumb {
  font-size: .85rem;
  color: var(--ink-soft);
  margin-bottom: 1.75rem;
}
.breadcrumb ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: .35rem; }
.breadcrumb li::after { content: "/"; margin-left: .35rem; color: var(--line); }
.breadcrumb li:last-child::after { content: ""; }
.breadcrumb a { color: var(--ink-soft); }

/* --- typography --- */
h1 {
  font-size: 2.15rem;
  line-height: 1.2;
  margin: 0 0 1.1rem;
  font-weight: 700;
}
h2 {
  font-size: 1.45rem;
  line-height: 1.3;
  margin: 2.6rem 0 .9rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--line);
}
h2:first-of-type { border-top: 0; padding-top: 0; margin-top: 2rem; }
h3 { font-size: 1.12rem; margin: 1.8rem 0 .6rem; }
p { margin: 0 0 1.1rem; }
.lede { font-size: 1.16rem; color: var(--ink-soft); line-height: 1.6; }
.kicker {
  font-size: .8rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 .6rem;
}
a { color: var(--accent-ink); }
a:hover { color: var(--accent); }
ul, ol { padding-left: 1.35rem; margin: 0 0 1.1rem; }
li { margin-bottom: .4rem; }
hr { border: 0; border-top: 1px solid var(--line); margin: 2.5rem 0; }
small, .small { font-size: .85rem; color: var(--ink-soft); }

/* --- hero --- */
.hero { padding: 1rem 0 0; }
.hero h1 { max-width: 22ch; }
.hero-sub { max-width: 58ch; color: var(--ink-soft); font-size: 1.1rem; }
.hero-meta {
  margin-top: 1.5rem;
  font-size: .85rem;
  color: var(--ink-soft);
  display: flex;
  flex-wrap: wrap;
  gap: .4rem 1.4rem;
}

/* --- CTA --- */
.cta-row { margin: 1.6rem 0 0; }
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: .7rem 1.3rem;
  border-radius: var(--radius);
  font-size: 1rem;
  border: 1px solid var(--accent);
}
.btn:hover { background: var(--accent-ink); color: #fff; }
.btn-quiet {
  background: none;
  color: var(--accent-ink);
  border: 1px solid var(--accent);
}
.btn-quiet:hover { background: var(--paper-2); color: var(--accent-ink); }

/* --- observation block --- */
.observation {
  margin: 3rem 0;
  max-width: var(--w-article);
}
.observation p { font-size: 1.06rem; }
.observation p:last-child { margin-bottom: 0; }

/* --- margin note / aside --- */
.margin-note {
  border-left: 3px solid var(--note);
  background: var(--note-bg);
  padding: .85rem 1.1rem;
  font-size: .93rem;
  color: #5c4a1e;
  margin: 1.6rem 0;
}
.margin-note p { margin: .3rem 0; }

/* --- blockquote --- */
blockquote {
  margin: 1.8rem 0;
  padding: .4rem 0 .4rem 1.3rem;
  border-left: 3px solid var(--note);
  color: var(--ink-soft);
  font-style: italic;
}
blockquote footer { font-style: normal; font-size: .85rem; margin-top: .5rem; color: var(--ink-soft); }

/* --- numbered steps (no icons) --- */
.steps { list-style: none; padding: 0; margin: 1.4rem 0; counter-reset: step; }
.steps li {
  counter-increment: step;
  padding: .9rem 0 .9rem 3rem;
  position: relative;
  border-top: 1px solid var(--line);
  margin: 0;
}
.steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: .95rem;
  font-size: 1rem;
  color: var(--accent);
  font-weight: 700;
}
.steps li:last-child { border-bottom: 1px solid var(--line); }
.steps .step-title { font-weight: 700; display: block; margin-bottom: .15rem; }

/* --- vertical timeline --- */
.timeline { list-style: none; padding: 0 0 0 1.2rem; margin: 1.4rem 0; border-left: 2px solid var(--line); }
.timeline li { position: relative; padding: 0 0 1.3rem 1.1rem; margin: 0; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -1.45rem;
  top: .45rem;
  width: .55rem;
  height: .55rem;
  background: var(--accent);
  border-radius: 50%;
}
.timeline .t-date { font-size: .82rem; letter-spacing: .08em; text-transform: uppercase; color: var(--accent); display: block; }

/* --- compact tables --- */
.table-wrap { overflow-x: auto; margin: 1.5rem 0; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: .92rem;
  line-height: 1.45;
}
caption { text-align: left; font-size: .85rem; color: var(--ink-soft); padding-bottom: .5rem; }
th, td {
  text-align: left;
  padding: .5rem .7rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
th { border-bottom: 2px solid var(--ink); font-size: .82rem; letter-spacing: .06em; text-transform: uppercase; }
tbody tr:last-child td { border-bottom: 1px solid var(--ink); }

/* --- annotated list --- */
.annotated { list-style: none; padding: 0; margin: 1.4rem 0; }
.annotated li { padding: .8rem 0; border-top: 1px solid var(--line); margin: 0; }
.annotated li:last-child { border-bottom: 1px solid var(--line); }
.annotated .a-title { font-weight: 700; }
.annotated .a-note { display: block; font-size: .92rem; color: var(--ink-soft); margin-top: .15rem; }

/* --- not-do list --- */
.not-do { border: 1px solid var(--line); border-left: 4px solid var(--warn); padding: 1rem 1.2rem; margin: 1.4rem 0; background: #fff; }
.not-do h3 { margin-top: 0; font-size: 1rem; }
.not-do ul { margin-bottom: 0; }

/* --- featured articles --- */
.featured { margin: 3rem 0; }
.article-main {
  border-top: 3px solid var(--accent);
  padding: 1.3rem 0 1.6rem;
  border-bottom: 1px solid var(--line);
}
.article-main h3 { font-size: 1.5rem; margin: .3rem 0 .6rem; line-height: 1.3; }
.article-main h3 a { color: var(--ink); text-decoration: none; }
.article-main h3 a:hover { color: var(--accent); }
.article-side {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  padding-top: 1.4rem;
}
.article-side h4 { font-size: 1.05rem; margin: .3rem 0 .4rem; line-height: 1.35; }
.article-side h4 a { color: var(--ink); text-decoration: none; }
.article-side h4 a:hover { color: var(--accent); }
.meta-line { font-size: .82rem; color: var(--ink-soft); letter-spacing: .02em; }
.tag {
  display: inline-block;
  font-size: .75rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: .1rem .45rem;
  border-radius: var(--radius);
}

/* --- faq --- */
.faq-item { border-top: 1px solid var(--line); padding: 1.1rem 0; }
.faq-item:last-child { border-bottom: 1px solid var(--line); }
.faq-item h3 { margin: 0 0 .55rem; font-size: 1.06rem; }
.faq-item p { margin-bottom: .7rem; }
.faq-item p:last-child { margin-bottom: 0; }

/* --- update log --- */
.update-log { font-size: .9rem; color: var(--ink-soft); }
.update-log li { margin-bottom: .55rem; }
.update-log time { color: var(--accent); font-size: .82rem; letter-spacing: .04em; }

/* --- forms --- */
.form-field { margin-bottom: 1.2rem; }
label { display: block; font-weight: 700; font-size: .95rem; margin-bottom: .3rem; }
label .req { color: var(--warn); }
input[type="text"], input[type="email"], textarea {
  width: 100%;
  padding: .6rem .7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 1rem;
  background: #fff;
  color: var(--ink);
}
textarea { min-height: 140px; resize: vertical; }
.form-help { font-size: .85rem; color: var(--ink-soft); margin-top: .3rem; }
.mailto-note {
  background: var(--paper-2);
  border: 1px solid var(--line);
  padding: .8rem 1rem;
  font-size: .9rem;
  margin: 1rem 0 1.4rem;
}

/* --- article page --- */
.article-head { margin-bottom: 2rem; }
.article-head h1 { max-width: 26ch; }
.byline {
  display: flex;
  flex-wrap: wrap;
  gap: .3rem 1.2rem;
  font-size: .88rem;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: .7rem 0;
  margin: 1.2rem 0 0;
}
.toc {
  background: var(--paper-2);
  border: 1px solid var(--line);
  padding: 1rem 1.2rem;
  margin: 2rem 0;
  font-size: .95rem;
}
.toc strong { display: block; margin-bottom: .4rem; font-size: .85rem; letter-spacing: .1em; text-transform: uppercase; color: var(--accent); }
.toc ol { margin: 0; }
.references { font-size: .92rem; }
.references li { margin-bottom: .6rem; }
.author-box {
  border-top: 2px solid var(--ink);
  margin-top: 3rem;
  padding-top: 1.2rem;
  font-size: .95rem;
}
.further { border-top: 1px solid var(--line); margin-top: 2.5rem; padding-top: 1.2rem; }

/* --- article cards on index --- */
.article-list { list-style: none; padding: 0; margin: 1.5rem 0; }
.article-list li { padding: 1.4rem 0; border-top: 1px solid var(--line); margin: 0; }
.article-list li:first-child { border-top: 3px solid var(--accent); }
.article-list h2, .article-list h3 { border: 0; padding: 0; margin: .3rem 0 .5rem; font-size: 1.3rem; }
.article-list h2 a, .article-list h3 a { color: var(--ink); text-decoration: none; }
.article-list h2 a:hover, .article-list h3 a:hover { color: var(--accent); }

/* --- placeholder article notice --- */
.draft-notice {
  border: 2px dashed var(--warn);
  background: var(--warn-bg);
  padding: 1.4rem 1.5rem;
  margin: 2rem 0;
}
.draft-notice h1 { font-size: 1.6rem; }

/* --- footer (asymmetric) --- */
.site-footer {
  border-top: 2px solid var(--ink);
  margin-top: 3rem;
  padding: 2.2rem 0 2.6rem;
  font-size: .9rem;
  color: var(--ink-soft);
}
.footer-grid {
  max-width: var(--w-home);
  margin: 0 auto;
  padding: 0 1.25rem;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2.5rem;
}
.footer-grid ul { list-style: none; padding: 0; margin: .5rem 0 0; }
.footer-grid li { margin-bottom: .3rem; }
.footer-grid a { color: var(--ink-soft); }
.footer-grid a:hover { color: var(--accent); }
.footer-legal { font-size: .8rem; margin-top: 1.6rem; padding-top: 1rem; border-top: 1px solid var(--line); }
.footer-col-title { font-size: .78rem; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin: 0; }

/* --- utility --- */
.center-narrow { max-width: var(--w-article); }
.mt-0 { margin-top: 0; }
.legal-page h2 { font-size: 1.2rem; }
.legal-page p, .legal-page li { font-size: .98rem; }

/* --- figures --- */
figure.figure { margin: 2rem 0; }
.figure img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.figure figcaption {
  font-size: .85rem;
  color: var(--ink-soft);
  margin-top: .5rem;
  border-left: 3px solid var(--line);
  padding-left: .7rem;
}

/* --- responsive --- */
@media (max-width: 720px) {
  h1 { font-size: 1.7rem; }
  .nav-toggle { display: block; }
  .main-nav { display: none; width: 100%; }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; gap: 0; padding: .6rem 0; }
  .main-nav li { border-top: 1px solid var(--line); }
  .main-nav a { display: block; padding: .7rem 0; }
  .header-inner { flex-wrap: wrap; }
  .article-side { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  main { padding: 1.6rem 0 2.5rem; }
}

@media print {
  .site-header, .site-footer, .cta-row, .placeholder-banner { display: none; }
}