/*
 * assets/notes/notes.css
 * Self-contained baseline styles for the standalone Paper Notes section (/notes/).
 * This file deliberately does NOT import or depend on any chirpy theme styles.
 * All classes are namespaced under `notes-`.
 *
 * NOTE: This is the BASELINE. The single 768px responsive breakpoint is added
 * separately (task 8.1); do not add media queries here.
 */

/* ------------------------------------------------------------------ *
 * Design tokens
 * ------------------------------------------------------------------ */
:root {
  --notes-bg: #ffffff;
  --notes-surface: #ffffff;
  --notes-surface-alt: #f6f7f9;
  --notes-border: #e2e5ea;
  --notes-text: #1f2328;
  --notes-text-muted: #57606a;
  --notes-text-subtle: #7a828c;
  --notes-accent: #2f6feb;
  --notes-accent-hover: #1f5ad6;
  --notes-badge-bg: #eef1f5;
  --notes-badge-text: #3a424c;
  --notes-track-bg: #e7f0ff;
  --notes-track-text: #1f5ad6;
  --notes-tag-bg: #f0f2f5;
  --notes-tag-text: #444c55;
  --notes-shadow: 0 1px 3px rgba(27, 31, 35, 0.06), 0 1px 2px rgba(27, 31, 35, 0.08);
  --notes-shadow-hover: 0 4px 12px rgba(27, 31, 35, 0.12);
  --notes-radius: 10px;
  --notes-radius-sm: 6px;
  --notes-radius-pill: 999px;
  --notes-topbar-height: 60px;
  --notes-content-max: 1120px;
  --notes-font: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft Yahei",
    Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", sans-serif;
  --notes-font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;
}

/* ------------------------------------------------------------------ *
 * Reset & base typography
 * ------------------------------------------------------------------ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--notes-bg);
  color: var(--notes-text);
  font-family: var(--notes-font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--notes-accent);
  text-decoration: none;
}

a:hover {
  color: var(--notes-accent-hover);
  text-decoration: underline;
}

h1,
h2,
h3,
h4 {
  color: var(--notes-text);
  line-height: 1.3;
  font-weight: 700;
}

img {
  max-width: 100%;
}

code {
  font-family: var(--notes-font-mono);
  font-size: 0.9em;
  background: var(--notes-surface-alt);
  padding: 0.1em 0.35em;
  border-radius: var(--notes-radius-sm);
}

pre {
  background: var(--notes-surface-alt);
  border: 1px solid var(--notes-border);
  border-radius: var(--notes-radius-sm);
  padding: 1rem;
  overflow-x: auto;
}

pre code {
  background: none;
  padding: 0;
}

/* ------------------------------------------------------------------ *
 * Layout container
 * ------------------------------------------------------------------ */
.notes-container {
  width: 100%;
  max-width: var(--notes-content-max);
  margin: 0 auto;
  padding: 0 24px;
}

.notes-main {
  padding-top: 32px;
  padding-bottom: 64px;
}

/* ------------------------------------------------------------------ *
 * Top bar: left title, centered search, right GitHub link
 * ------------------------------------------------------------------ */
.notes-topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 24px;
  height: var(--notes-topbar-height);
  padding: 0 24px;
  background: var(--notes-surface);
  border-bottom: 1px solid var(--notes-border);
  box-shadow: var(--notes-shadow);
}

.notes-topbar__title {
  flex: 0 0 auto;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--notes-text);
  white-space: nowrap;
}

.notes-topbar__title:hover {
  color: var(--notes-accent);
  text-decoration: none;
}

/* Search area: wrapper centers it, box anchors the dropdown panel. */
.notes-topbar__searchwrap {
  flex: 1 1 auto;
  display: flex;
  justify-content: center;
  min-width: 0;
}

.notes-topbar__searchbox {
  position: relative;
  width: 100%;
  max-width: 560px;
}

.notes-topbar__search {
  display: flex;
  align-items: center;
  gap: 8px;
}

.notes-topbar__search-input {
  flex: 1 1 auto;
  min-width: 0;
  height: 38px;
  padding: 0 14px;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--notes-text);
  background: var(--notes-surface-alt);
  border: 1px solid var(--notes-border);
  border-radius: var(--notes-radius-pill);
  outline: none;
  transition: border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.notes-topbar__search-input:focus {
  background: var(--notes-surface);
  border-color: var(--notes-accent);
  box-shadow: 0 0 0 3px rgba(47, 111, 235, 0.15);
}

.notes-topbar__search-input::placeholder {
  color: var(--notes-text-subtle);
}

.notes-topbar__search-button {
  flex: 0 0 auto;
  height: 38px;
  padding: 0 16px;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: inherit;
  color: #ffffff;
  background: var(--notes-accent);
  border: 1px solid var(--notes-accent);
  border-radius: var(--notes-radius-pill);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.notes-topbar__search-button:hover {
  background: var(--notes-accent-hover);
  border-color: var(--notes-accent-hover);
}

.notes-topbar__github {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--notes-text-muted);
  font-size: 0.9rem;
  font-weight: 600;
  white-space: nowrap;
}

/* Live search dropdown panel (anchored under the search box) */
.notes-search-panel {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  z-index: 200;
  max-height: 72vh;
  overflow-y: auto;
  padding: 10px;
  background: var(--notes-surface);
  border: 1px solid var(--notes-border);
  border-radius: var(--notes-radius);
  box-shadow: var(--notes-shadow-hover);
}

.notes-search-panel[hidden] {
  display: none;
}

.notes-search-panel__scope,
.notes-search-filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.notes-search-panel__scope {
  padding: 4px 4px 10px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--notes-border);
}

.notes-search-filters {
  margin-bottom: 20px;
}

.notes-scope {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--notes-text-muted);
}

.notes-scope__select {
  font-family: inherit;
  font-size: 0.85rem;
  padding: 5px 10px;
  color: var(--notes-text);
  background: var(--notes-surface);
  border: 1px solid var(--notes-border);
  border-radius: var(--notes-radius-sm);
  cursor: pointer;
}

.notes-search-panel__results .notes-list {
  gap: 8px;
}

.notes-search-panel__hint {
  padding: 10px 8px;
  color: var(--notes-text-muted);
  font-size: 0.9rem;
}

.notes-search-panel__more {
  display: block;
  margin-top: 8px;
  padding: 8px;
  text-align: center;
  font-size: 0.9rem;
  font-weight: 600;
}

.notes-topbar__github:hover {
  color: var(--notes-accent);
  text-decoration: none;
}

/* Accessible visually-hidden helper (e.g. the search label) */
.notes-visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ------------------------------------------------------------------ *
 * Page heading (listing pages & section titles)
 * ------------------------------------------------------------------ */
.notes-page-heading {
  margin: 0 0 24px;
}

.notes-page-heading__title {
  margin: 0;
  font-size: 1.8rem;
  font-weight: 800;
}

.notes-page-heading__subtitle {
  margin: 6px 0 0;
  color: var(--notes-text-muted);
  font-size: 0.95rem;
}

/* ------------------------------------------------------------------ *
 * Home page: conference cards grid
 * ------------------------------------------------------------------ */
.notes-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.notes-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 14px;
  min-height: 120px;
  padding: 20px 22px;
  background: var(--notes-surface);
  border: 1px solid var(--notes-border);
  border-radius: var(--notes-radius);
  box-shadow: var(--notes-shadow);
  color: var(--notes-text);
  transition: transform 0.12s ease, box-shadow 0.12s ease, border-color 0.12s ease;
}

.notes-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--notes-shadow-hover);
  border-color: var(--notes-accent);
  text-decoration: none;
  color: var(--notes-text);
}

.notes-card__label {
  font-size: 1.2rem;
  font-weight: 700;
}

.notes-card__count {
  font-size: 0.9rem;
  color: var(--notes-text-muted);
}

/* ------------------------------------------------------------------ *
 * Listing: statistics summary
 * ------------------------------------------------------------------ */
.notes-stats {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
  padding: 16px 18px;
  background: var(--notes-surface-alt);
  border: 1px solid var(--notes-border);
  border-radius: var(--notes-radius);
}

.notes-stats__tracks {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.notes-stat {
  color: var(--notes-text-muted);
  font-size: 0.95rem;
}

.notes-stat b {
  color: var(--notes-text);
  font-size: 1.15rem;
  font-weight: 800;
  margin-right: 3px;
}

.notes-stats__cats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 12px;
  border-top: 1px solid var(--notes-border);
}

.notes-stat-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-size: 0.85rem;
  color: var(--notes-badge-text);
  background: var(--notes-surface);
  border: 1px solid var(--notes-border);
  border-radius: var(--notes-radius-pill);
}

.notes-stat-chip b {
  color: var(--notes-accent);
  font-weight: 800;
}

.notes-stat-chip:hover {
  border-color: var(--notes-accent);
  color: var(--notes-accent);
  text-decoration: none;
}

/* ------------------------------------------------------------------ *
 * Listing: list items
 * ------------------------------------------------------------------ */
.notes-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* Rows beyond the preview limit stay hidden until "Show more" reveals them. */
.notes-list-row.is-extra {
  display: none;
}

.notes-showmore {
  display: inline-block;
  margin-top: 18px;
  padding: 9px 20px;
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--notes-accent);
  background: var(--notes-surface);
  border: 1px solid var(--notes-border);
  border-radius: var(--notes-radius-pill);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}

.notes-showmore:hover {
  border-color: var(--notes-accent);
  background: var(--notes-accent);
  color: #ffffff;
}

.notes-list-item {
  display: block;
  padding: 18px 20px;
  background: var(--notes-surface);
  border: 1px solid var(--notes-border);
  border-radius: var(--notes-radius);
  box-shadow: var(--notes-shadow);
  color: var(--notes-text);
  transition: transform 0.12s ease, box-shadow 0.12s ease, border-color 0.12s ease;
}

.notes-list-item:hover {
  transform: translateY(-1px);
  box-shadow: var(--notes-shadow-hover);
  border-color: var(--notes-accent);
  text-decoration: none;
  color: var(--notes-text);
}

.notes-list-item__title {
  margin: 0 0 6px;
  font-size: 1.15rem;
  font-weight: 700;
}

.notes-list-item__authors {
  margin: 0 0 8px;
  color: var(--notes-text-muted);
  font-size: 0.92rem;
}

.notes-list-item__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.notes-list-item__conference {
  color: var(--notes-text-subtle);
  font-size: 0.85rem;
  font-weight: 600;
}

/* ------------------------------------------------------------------ *
 * Badges: track (display-only), category, tag
 * ------------------------------------------------------------------ */
.notes-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  font-size: 0.78rem;
  font-weight: 600;
  line-height: 1.6;
  border-radius: var(--notes-radius-pill);
  background: var(--notes-badge-bg);
  color: var(--notes-badge-text);
  white-space: nowrap;
}

/* Track badge is display-only (never a link) */
.notes-track {
  background: var(--notes-track-bg);
  color: var(--notes-track-text);
}

/* Category badge (links to a Category_Page) */
.notes-category {
  background: var(--notes-badge-bg);
  color: var(--notes-badge-text);
}

a.notes-category:hover {
  background: var(--notes-accent);
  color: #ffffff;
  text-decoration: none;
}

/* Tag badge (links to a Tag_Page) */
.notes-tag {
  background: var(--notes-tag-bg);
  color: var(--notes-tag-text);
  font-weight: 500;
}

a.notes-tag:hover {
  background: var(--notes-accent);
  color: #ffffff;
  text-decoration: none;
}

.notes-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

/* ------------------------------------------------------------------ *
 * Paper detail page: layout, header, body, sidebar
 * ------------------------------------------------------------------ */
.notes-detail {
  display: flex;
  align-items: flex-start;
  gap: 28px;
}

/* Collapsible left sidebar (nearby papers) */
.notes-sidebar {
  flex: 0 0 260px;
  width: 260px;
  align-self: flex-start;
  position: sticky;
  top: calc(var(--notes-topbar-height) + 16px);
  background: var(--notes-surface-alt);
  border: 1px solid var(--notes-border);
  border-radius: var(--notes-radius);
  padding: 16px;
  overflow: hidden;
  transition: width 0.2s ease, padding 0.2s ease, opacity 0.2s ease;
}

/* Closed state driven by sidebar.js (explicit toggle only) */
.notes-sidebar.is-collapsed {
  flex-basis: 0;
  width: 0;
  padding: 0;
  border-width: 0;
  opacity: 0;
}

.notes-sidebar__heading {
  margin: 0 0 8px;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--notes-text-subtle);
}

.notes-sidebar__all {
  display: block;
  margin-bottom: 12px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--notes-text-muted);
}

.notes-sidebar__all:hover {
  color: var(--notes-accent);
  text-decoration: none;
}

.notes-sidebar__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: calc(100vh - 200px);
  overflow-y: auto;
}

.notes-sidebar__link {
  display: block;
  font-size: 0.9rem;
  color: var(--notes-text-muted);
  line-height: 1.4;
}

.notes-sidebar__link.is-current {
  color: var(--notes-text);
  font-weight: 700;
}

.notes-sidebar__link:hover {
  color: var(--notes-accent);
  text-decoration: none;
}

/* Sidebar toggle control */
.notes-sidebar-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--notes-border);
  border-radius: var(--notes-radius-sm);
  background: var(--notes-surface);
  color: var(--notes-text-muted);
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
}

.notes-sidebar-toggle:hover {
  border-color: var(--notes-accent);
  color: var(--notes-accent);
}

/* Detail main content column */
.notes-article {
  flex: 1 1 auto;
  min-width: 0;
}

/* Detail header + badges */
.notes-detail-header {
  padding-bottom: 20px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--notes-border);
}

.notes-detail-header__toprow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.notes-detail-header__title {
  margin: 0 0 12px;
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.25;
}

.notes-detail-header__authors {
  margin: 0 0 6px;
  color: var(--notes-text-muted);
  font-size: 1rem;
}

.notes-detail-header__institution {
  margin: 0 0 12px;
  color: var(--notes-text-subtle);
  font-size: 0.92rem;
  font-style: italic;
}

.notes-detail-header__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 4px;
}

.notes-detail-header__conference {
  color: var(--notes-text-subtle);
  font-size: 0.9rem;
  font-weight: 600;
}

/* Link controls (paper / project / video / code) */
.notes-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.notes-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--notes-radius-pill);
  background: var(--notes-surface-alt);
  border: 1px solid var(--notes-border);
  color: var(--notes-text);
}

.notes-link:hover {
  background: var(--notes-accent);
  border-color: var(--notes-accent);
  color: #ffffff;
  text-decoration: none;
}

/* Rendered Markdown body */
.notes-body {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--notes-text);
}

/* Mermaid diagrams: strip the code-block chrome and center the rendered SVG. */
.notes-body .mermaid {
  background: none;
  border: 0;
  padding: 0;
  margin: 1.5rem 0;
  text-align: center;
  overflow-x: auto;
  line-height: normal;
}

.notes-body > *:first-child {
  margin-top: 0;
}

.notes-body h2 {
  margin-top: 2rem;
  font-size: 1.4rem;
}

.notes-body h3 {
  margin-top: 1.6rem;
  font-size: 1.15rem;
}

.notes-body blockquote {
  margin: 1rem 0;
  padding: 0.4rem 1rem;
  border-left: 3px solid var(--notes-border);
  color: var(--notes-text-muted);
}

.notes-body table {
  border-collapse: collapse;
  width: 100%;
  margin: 1rem 0;
}

.notes-body th,
.notes-body td {
  border: 1px solid var(--notes-border);
  padding: 6px 10px;
  text-align: left;
}

/* ------------------------------------------------------------------ *
 * Empty state (shared by listing surfaces and empty detail body)
 * ------------------------------------------------------------------ */
.notes-empty {
  padding: 48px 24px;
  text-align: center;
  color: var(--notes-text-muted);
  background: var(--notes-surface-alt);
  border: 1px dashed var(--notes-border);
  border-radius: var(--notes-radius);
  font-size: 0.98rem;
}

/* ------------------------------------------------------------------ *
 * Search results view
 * ------------------------------------------------------------------ */
.notes-search-results {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* ------------------------------------------------------------------ *
 * Responsive layout — SINGLE breakpoint (Requirement 15)
 *
 * Exactly one breakpoint at 768px. At/below 768px the listing content
 * (conference cards, list items) collapses to a single column and the
 * two-column detail layout stacks so the article uses the full width.
 * The Top_Bar, Search_Box, and sidebar toggle stay visible and usable.
 * Above 768px the baseline rules above already use the available width
 * with no horizontal body scroll.
 * ------------------------------------------------------------------ */
@media (max-width: 768px) {
  /* Never let any element force horizontal page-body scrolling. */
  html,
  body {
    max-width: 100%;
    overflow-x: hidden;
  }

  .notes-container {
    padding: 0 16px;
  }

  /* Top bar: allow wrapping so title, search, and GitHub link stay
     visible and operable on narrow viewports. */
  .notes-topbar {
    height: auto;
    flex-wrap: wrap;
    gap: 12px;
    padding: 10px 16px;
  }

  /* Search drops to its own full-width row below the title + GitHub link. */
  .notes-topbar__searchwrap {
    order: 3;
    flex: 1 1 100%;
  }

  .notes-topbar__searchbox {
    max-width: none;
  }

  /* Listing content → single column. */
  .notes-cards {
    grid-template-columns: 1fr;
  }

  .notes-list {
    gap: 12px;
  }

  /* Detail two-column layout stacks: sidebar on top, article full width. */
  .notes-detail {
    flex-direction: column;
    gap: 16px;
  }

  .notes-sidebar {
    flex-basis: auto;
    width: 100%;
  }

  .notes-article {
    width: 100%;
  }

  .notes-detail-header__title {
    font-size: 1.5rem;
  }
}