/* Noctua — plain CSS, no framework. Dark-first with a light override. */

:root {
  --bg: #16171c;
  --bg-elev: #1f2029;
  --bg-elev-2: #272838;
  --border: #33344a;
  --text: #e7e7ef;
  --text-dim: #a2a3b4;
  --accent: #8b7bf5;
  --accent-contrast: #ffffff;
  --danger: #f2708a;
  --radius: 10px;
  --gap: 16px;
  --maxw: 1100px;
  --header-h: 56px;
  --shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
  color-scheme: dark;
}

/* Light palette: shared by explicit choice and (when unset) the OS preference. */
:root[data-theme="light"],
:root.theme-light {
  --bg: #f6f6fb;
  --bg-elev: #ffffff;
  --bg-elev-2: #eeeef6;
  --border: #dcdce8;
  --text: #1c1d26;
  --text-dim: #5c5d6e;
  --accent: #6a58e6;
  --shadow: 0 6px 24px rgba(20, 20, 40, 0.12);
  color-scheme: light;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]):not([data-theme="light"]) {
    --bg: #f6f6fb;
    --bg-elev: #ffffff;
    --bg-elev-2: #eeeef6;
    --border: #dcdce8;
    --text: #1c1d26;
    --text-dim: #5c5d6e;
    --accent: #6a58e6;
    --shadow: 0 6px 24px rgba(20, 20, 40, 0.12);
    color-scheme: light;
  }
}

* { box-sizing: border-box; }

/* The `hidden` attribute must always win, even over layout rules like the
   modal overlay's display:flex — otherwise a "hidden" layer covers the page. */
[hidden] { display: none !important; }

html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }

/* ---------------------------------------------------------------- header */

.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: var(--gap);
  padding: 0 clamp(12px, 4vw, 28px);
  background: color-mix(in srgb, var(--bg-elev) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(8px);
  border-bottom: 1px solid var(--border);
}

.brand { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; }
.brand-mark { font-size: 22px; }
.brand-name { letter-spacing: 0.02em; }

.app-nav { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
.app-nav a {
  padding: 7px 12px;
  border-radius: 8px;
  color: var(--text-dim);
  font-size: 14px;
  font-weight: 600;
}
.app-nav a:hover { color: var(--text); background: var(--bg-elev-2); }
.app-nav a.active { color: var(--accent-contrast); background: var(--accent); }

/* ------------------------------------------------------------------ view */

.view {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(16px, 3vw, 28px);
}

.feed-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.feed-refresh { flex: none; font-size: 0.85rem; }
.feed-title { font-size: 1.6rem; margin: 0 0 4px; }
.feed-subtitle { color: var(--text-dim); margin: 0 0 20px; }
.feed-sections { display: flex; flex-direction: column; gap: 32px; }

.section-title { font-size: 1.05rem; margin: 0 0 12px; color: var(--text); }

.group-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.group-more { color: var(--accent); font-size: 0.9rem; font-weight: 600; }
.group-more:hover { text-decoration: underline; }

/* ----------------------------------------------------------- navigation */

.nav-list-items, .facet-links { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.nav-list-items { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }

.nav-link, .facet-link {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 12px 14px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-weight: 600;
  transition: border-color 0.15s, transform 0.05s;
}
.nav-link:hover, .facet-link:hover { border-color: var(--accent); }
.nav-link:active, .facet-link:active { transform: translateY(1px); }

.nav-link-count, .facet-count {
  color: var(--text-dim); font-weight: 500; font-size: 0.85rem;
  background: var(--bg-elev-2); padding: 2px 8px; border-radius: 999px;
}

.facet-links { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
.facet-link { padding: 9px 12px; font-size: 0.92rem; }
.facet-link.active { border-color: var(--accent); background: var(--bg-elev-2); }

/* ---------------------------------------------------------- publications */

.pub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--gap);
}

.pub-card { display: flex; flex-direction: column; gap: 8px; }
.pub-card:hover .pub-cover { border-color: var(--accent); }

.pub-cover, .pub-detail-cover {
  position: relative;
  aspect-ratio: 2 / 3;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
}
.pub-cover img, .pub-detail-cover img { width: 100%; height: 100%; object-fit: cover; display: block; }

.pub-cover-fallback {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-dim); font-size: 2rem;
}
.pub-cover-fallback::after { content: "📖"; }

.pub-meta { display: flex; flex-direction: column; gap: 2px; }
.pub-title { font-weight: 600; font-size: 0.9rem; line-height: 1.25; }
.pub-author { color: var(--text-dim); font-size: 0.8rem; }

/* --------------------------------------------------------- pub detail */

.pub-detail { display: grid; grid-template-columns: minmax(160px, 240px) 1fr; gap: clamp(16px, 4vw, 36px); }
.pub-detail-cover { align-self: start; }
.pub-detail-title { font-size: 1.7rem; margin: 0 0 6px; }
.pub-detail-author { color: var(--text-dim); margin: 0 0 18px; font-size: 1.05rem; }
.pub-detail-facts { display: grid; grid-template-columns: auto 1fr; gap: 4px 16px; margin: 0 0 20px; }
.pub-detail-facts dt { color: var(--text-dim); }
.pub-detail-facts dd { margin: 0; }
.fact { display: contents; }
.pub-detail-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 22px; }
.pub-detail-description { color: var(--text); line-height: 1.65; }
.pub-detail-note { color: var(--text-dim); }
.pub-detail-description :where(p, ul, ol) { margin: 0 0 1em; }

@media (max-width: 560px) {
  .pub-detail { grid-template-columns: 1fr; }
  .pub-detail-cover { max-width: 200px; }
}

/* --------------------------------------------------------------- pager */

.pager { display: flex; align-items: center; gap: 10px; margin-top: 28px; flex-wrap: wrap; }
.pager-status { color: var(--text-dim); font-size: 0.9rem; margin: 0 auto; }

/* ---------------------------------------------------------------- lists */

.list-rows { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.list-row {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 14px; background: var(--bg-elev);
  border: 1px solid var(--border); border-radius: var(--radius);
}
.list-row-link { flex: 1; display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.list-row-title { font-weight: 600; }
.list-row-sub { color: var(--text-dim); font-size: 0.85rem; }

/* -------------------------------------------------------------- buttons */

.btn {
  appearance: none; cursor: pointer;
  font: inherit; font-weight: 600; font-size: 0.9rem;
  padding: 9px 16px; border-radius: 8px;
  color: var(--text); background: var(--bg-elev-2);
  border: 1px solid var(--border);
  transition: border-color 0.15s, background 0.15s, opacity 0.15s;
}
.btn:hover { border-color: var(--accent); }
.btn:disabled { opacity: 0.5; cursor: default; }
.btn-primary { background: var(--accent); color: var(--accent-contrast); border-color: transparent; }
.btn-quiet { background: transparent; border-color: transparent; color: var(--text-dim); }
.btn-quiet:hover { color: var(--text); background: var(--bg-elev-2); }
.btn.is-on { border-color: var(--accent); color: var(--accent); }

/* ------------------------------------------------------------ states */

.state { padding: 40px 16px; text-align: center; color: var(--text-dim); }
.state-error { color: var(--danger); }
.state-error .btn { margin-top: 12px; }

.spinner {
  display: inline-block; width: 16px; height: 16px; vertical-align: -3px;
  border: 2px solid var(--border); border-top-color: var(--accent);
  border-radius: 50%; animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ------------------------------------------------------------- forms */

.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.field span { font-size: 0.85rem; color: var(--text-dim); font-weight: 600; }
.field input, .field select, .search-form input {
  font: inherit; padding: 10px 12px; border-radius: 8px;
  background: var(--bg); color: var(--text); border: 1px solid var(--border);
}
.field input:focus, .field select:focus, .search-form input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.settings-form { max-width: 520px; }

/* -------------------------------------------------------------- modal */

.modal-root {
  position: fixed; inset: 0; z-index: 100;
  display: flex; align-items: center; justify-content: center;
  padding: 20px; background: rgba(0, 0, 0, 0.5);
}
.modal {
  width: min(420px, 100%);
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: 14px; padding: 22px; box-shadow: var(--shadow);
}
.modal-title { margin: 0 0 6px; font-size: 1.2rem; }
.modal-desc { color: var(--text-dim); margin: 0 0 16px; }
.modal-error { color: var(--danger); margin: 0 0 12px; font-size: 0.9rem; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 6px; }

/* -------------------------------------------------------------- toast */

.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%);
  z-index: 200; max-width: 90vw;
  padding: 12px 18px; border-radius: 10px;
  background: var(--bg-elev-2); color: var(--text);
  border: 1px solid var(--border); box-shadow: var(--shadow);
}
.toast.error { border-color: var(--danger); color: var(--danger); }

/* --------------------------------------------------------------- reader */

.reader {
  position: fixed;
  inset: var(--header-h) 0 0 0;
  z-index: 5;
  display: flex;
  flex-direction: column;
  background: var(--bg);
}
.reader-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px clamp(12px, 3vw, 20px);
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
}
.reader-title {
  flex: 1;
  min-width: 0;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.reader-toc {
  max-width: 220px;
  font: inherit;
  padding: 6px 8px;
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
}
.reader-progress { color: var(--text-dim); font-size: 0.85rem; min-width: 3.5em; text-align: right; }
.reader-nav { display: flex; gap: 6px; }
.reader-nav .btn { padding: 6px 14px; font-size: 1.15rem; line-height: 1; }

.reader-stage { position: relative; flex: 1; min-height: 0; overflow: hidden; }
.reader-stage-epub { background: #fff; }
.reader-stage-pdf {
  overflow: auto;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 12px;
  background: var(--bg-elev-2);
}
.reader-stage-pdf canvas { max-width: 100%; height: auto; background: #fff; box-shadow: var(--shadow); }