/* ── Theme variables ─────────────────────────────────────────────────── */

:root {
  --bg: #faf9f6;             /* off-white page background */
  --bg-panel: #ffffff;
  --text: #22262a;
  --text-muted: #6b7280;
  --link: #1a5fa8;           /* readable blue for links */
  --accent-blue: #dcebf9;    /* light blue — headers, buttons, tags */
  --accent-blue-border: #b5d3ee;
  --accent-yellow: #fdf3cd;  /* light yellow — highlights, callouts */
  --accent-yellow-border: #e8d48a;
  --border: #d9d9d3;
  --danger: #a33a3a;
  --ok: #2e6b3e;
  --mark-bg: #fdeea3;
  --code-bg: #f1f0ec;
}

[data-theme="dark"] {
  --bg: #21252b;             /* muted dark, not pure black */
  --bg-panel: #282d34;
  --text: #d7dbe0;
  --text-muted: #8b929c;
  --link: #7fb3e8;
  --accent-blue: #2c3a4a;
  --accent-blue-border: #3d5165;
  --accent-yellow: #3a3526;
  --accent-yellow-border: #6b5f35;
  --border: #3a3f47;
  --danger: #d98181;
  --ok: #8bc79a;
  --mark-bg: #6b5f2a;
  --code-bg: #1c2025;
}

/* ── Base ────────────────────────────────────────────────────────────── */

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

.container {
  max-width: 58rem;
  margin: 0 auto;
  padding: 0 1rem;
}

main.container { padding-top: 1.25rem; padding-bottom: 3rem; }

a { color: var(--link); }
a:hover { text-decoration-thickness: 2px; }

h1 { font-size: 1.55rem; margin: 0.5rem 0 0.75rem; }
h2 {
  font-size: 1.15rem;
  margin: 1.75rem 0 0.5rem;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid var(--border);
}

code {
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 3px;
  font-size: 0.9em;
}

pre.plaintext {
  background: var(--code-bg);
  border: 1px solid var(--border);
  padding: 1rem;
  overflow-x: auto;
  white-space: pre-wrap;
  border-radius: 4px;
}

mark { background: var(--mark-bg); color: inherit; padding: 0 0.1em; }

.muted { color: var(--text-muted); font-size: 0.9em; }

/* ── Header / footer ─────────────────────────────────────────────────── */

.site-header {
  background: var(--accent-blue);
  border-bottom: 1px solid var(--accent-blue-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-top: 0.55rem;
  padding-bottom: 0.55rem;
}

.site-name {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.site-nav a { color: var(--text); text-decoration: none; font-size: 0.95rem; }
.site-nav a:hover { text-decoration: underline; }

.header-search input {
  padding: 0.3rem 0.55rem;
  border: 1px solid var(--accent-blue-border);
  border-radius: 4px;
  background: var(--bg-panel);
  color: var(--text);
  width: 13rem;
  max-width: 45vw;
}

#theme-toggle {
  background: transparent;
  border: 1px solid var(--accent-blue-border);
  border-radius: 4px;
  color: var(--text);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  padding: 0.3rem 0.5rem;
}

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: 0.9rem 0 2rem;
}

/* ── Forms & buttons ─────────────────────────────────────────────────── */

input[type="text"], input[type="search"], input[type="password"], input[type="file"] {
  font: inherit;
  color: var(--text);
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.45rem 0.6rem;
  width: 100%;
  max-width: 28rem;
}

label { display: block; margin: 0.6rem 0 0.2rem; font-weight: 600; font-size: 0.9rem; }

button {
  font: inherit;
  cursor: pointer;
  background: var(--accent-blue);
  border: 1px solid var(--accent-blue-border);
  color: var(--text);
  padding: 0.45rem 0.9rem;
  border-radius: 4px;
  margin-top: 0.6rem;
}
button:hover { filter: brightness(0.96); }
button.secondary { background: transparent; border-color: var(--border); }
button.danger { background: transparent; border-color: var(--danger); color: var(--danger); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

.inline-form { display: inline; }
.inline-form button { margin-top: 0.25rem; }

/* ── Notices / tags ──────────────────────────────────────────────────── */

.notice {
  background: var(--accent-yellow);
  border: 1px solid var(--accent-yellow-border);
  border-radius: 4px;
  padding: 0.6rem 0.9rem;
  margin: 0.75rem 0;
}
.notice-error { border-color: var(--danger); }
.notice-ok { border-color: var(--ok); }

.tag {
  display: inline-block;
  background: var(--accent-yellow);
  border: 1px solid var(--accent-yellow-border);
  border-radius: 3px;
  font-size: 0.75rem;
  padding: 0.05rem 0.4rem;
  vertical-align: middle;
}
.tag-delete { border-color: var(--danger); }
.tag-upload { border-color: var(--ok); }

/* ── Library & search ────────────────────────────────────────────────── */

.doc-list { list-style: none; margin: 0; padding: 0; }

.doc-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.35rem 0;
  border-bottom: 1px dotted var(--border);
  flex-wrap: wrap;
}

.doc-title { font-weight: 600; }
.doc-meta { display: inline-flex; gap: 0.5rem; align-items: baseline; flex-wrap: wrap; }

.big-search { display: flex; gap: 0.5rem; margin: 0.75rem 0 1.25rem; }
.big-search input { max-width: 34rem; }
.big-search button { margin-top: 0; }

.search-results { list-style: none; padding: 0; }
.search-results li { padding: 0.6rem 0; border-bottom: 1px dotted var(--border); }
.snippet { margin: 0.25rem 0 0; color: var(--text-muted); font-size: 0.92rem; }

/* ── Document viewer ─────────────────────────────────────────────────── */

.doc-header { border-bottom: 1px solid var(--border); padding-bottom: 0.5rem; margin-bottom: 1rem; }
.doc-header .doc-meta { display: flex; gap: 0.6rem; align-items: baseline; flex-wrap: wrap; margin: 0.25rem 0 0; }

.doc-body { line-height: 1.7; }
.doc-body h1, .doc-body h2, .doc-body h3 { margin-top: 1.5em; }
.doc-body table { border-collapse: collapse; }
.doc-body td, .doc-body th { border: 1px solid var(--border); padding: 0.3rem 0.6rem; }
.doc-body blockquote {
  margin: 1rem 0;
  padding: 0.4rem 0.9rem;
  background: var(--accent-yellow);
  border-left: 3px solid var(--accent-yellow-border);
}
.doc-body img { max-width: 100%; }

.pdf-frame {
  width: 100%;
  height: 75vh;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-panel);
}

/* ── Q&A ─────────────────────────────────────────────────────────────── */

.qa-thread { margin: 1rem 0; }

.qa-item { margin-bottom: 1rem; }

.qa-question {
  font-weight: 600;
  padding: 0.5rem 0.8rem;
  background: var(--accent-blue);
  border: 1px solid var(--accent-blue-border);
  border-radius: 4px;
  margin-bottom: 0.4rem;
}

.qa-answer {
  padding: 0.6rem 0.9rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 4px;
}
.qa-answer.pending { color: var(--text-muted); font-style: italic; }
.qa-answer p:first-child { margin-top: 0; }
.qa-answer p:last-child { margin-bottom: 0; }

.qa-sources { margin-top: 0.4rem; font-size: 0.88rem; color: var(--text-muted); }
.qa-sources a { margin-right: 0.6rem; }

.ask-form { display: flex; gap: 0.5rem; margin-top: 1rem; }
.ask-form input { max-width: 34rem; }
.ask-form button { margin-top: 0; }

/* ── Admin ───────────────────────────────────────────────────────────── */

.login-box { max-width: 24rem; margin: 2rem auto; }
.login-box form { margin-top: 1rem; }

.admin-header { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; }

.dropzone {
  border: 2px dashed var(--border);
  border-radius: 6px;
  padding: 1rem;
  text-align: center;
  margin: 0.5rem 0;
}
.dropzone.dragover { border-color: var(--link); background: var(--accent-blue); }
.dropzone p { margin: 0.25rem 0; }
.dropzone input[type="file"] { margin-top: 0.5rem; }

.form-row { display: flex; gap: 1rem; flex-wrap: wrap; }
.form-row > div { flex: 1 1 14rem; }

.admin-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.admin-table th {
  text-align: left;
  border-bottom: 2px solid var(--border);
  padding: 0.35rem 0.5rem;
}
.admin-table td { border-bottom: 1px dotted var(--border); padding: 0.4rem 0.5rem; vertical-align: top; }

.replace-form { margin: 0.5rem 0; max-width: 20rem; }

details summary { cursor: pointer; color: var(--link); }

/* ── Mobile ──────────────────────────────────────────────────────────── */

@media (max-width: 640px) {
  .header-inner { flex-direction: column; align-items: flex-start; }
  .header-search input { width: 100%; max-width: none; }
  .doc-row { flex-direction: column; gap: 0.15rem; }
  .admin-table { display: block; overflow-x: auto; }
  .pdf-frame { height: 60vh; }
}