/* =============================================
   AAAR Book — "Scholar" Design System
   Modern Chinese Academic Digital Publishing
   ============================================= */

/* ---- Design Tokens ---- */
:root {
  /* Color Palette */
  --bg: #FAFAF8;
  --bg-alt: #F3F1EB;
  --bg-sidebar: #F5F3ED;
  --bg-code: #F5F3EE;
  --bg-card: #FFFFFF;
  --bg-hover: #EEECE5;

  --border: #E2DED4;
  --border-light: #ECEAE3;

  --ink: #1C1917;
  --ink-2: #44403C;
  --ink-3: #78716C;
  --ink-4: #A8A29E;
  --ink-5: #D6D3CD;

  --accent: #0F766E;
  --accent-hover: #0D5D57;
  --accent-subtle: rgba(15, 118, 110, 0.07);
  --accent-bg: rgba(15, 118, 110, 0.03);

  /* Semantic colors for callouts */
  --color-note: #0369A1;
  --color-note-bg: rgba(3, 105, 161, 0.04);
  --color-tip: #15803D;
  --color-tip-bg: rgba(21, 128, 61, 0.04);
  --color-warning: #B45309;
  --color-warning-bg: rgba(180, 83, 9, 0.04);
  --color-important: #BE123C;
  --color-important-bg: rgba(190, 18, 60, 0.04);
  --color-caution: #7C3AED;
  --color-caution-bg: rgba(124, 58, 237, 0.04);

  /* Typography */
  --font-body: "Noto Serif SC", "Songti SC", "STSong", Georgia, "Times New Roman", serif;
  --font-heading: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
  --font-ui: "Noto Sans SC", "PingFang SC", -apple-system, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "Menlo", "SFMono-Regular", monospace;

  /* Layout */
  --content-max: 740px;

  /* Effects */
  --shadow-xs: 0 1px 2px rgba(28, 25, 23, 0.03);
  --shadow-sm: 0 1px 3px rgba(28, 25, 23, 0.05), 0 1px 2px rgba(28, 25, 23, 0.03);
  --shadow-md: 0 4px 12px rgba(28, 25, 23, 0.06);
  --shadow-lg: 0 8px 24px rgba(28, 25, 23, 0.08);

  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --transition: 200ms var(--ease);

  /* Bootstrap overrides */
  --bs-primary: #0F766E;
  --bs-primary-rgb: 15, 118, 110;
  --bs-link-color: #0F766E;
  --bs-link-hover-color: #0D5D57;
}


/* ---- Base ---- */
*,
*::before,
*::after {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.95;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
  text-rendering: optimizeLegibility;
  overflow-wrap: break-word;
  line-break: strict;
}

::selection {
  background: rgba(15, 118, 110, 0.15);
  color: var(--ink);
}

/* Hide edit/repo links */
.book-extra {
  display: none;
}


/* ---- Typography ---- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--ink);
  letter-spacing: -0.01em;
  font-weight: 700;
}

/* Chapter title */
h1 {
  font-size: 2rem;
  line-height: 1.35;
  margin-bottom: 1.5rem;
  padding-top: 1.6rem;
  position: relative;
}

h1::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 44px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
}

/* Section numbers in accent color */
.header-section-number {
  color: var(--accent);
  font-weight: 500;
  margin-right: 0.4em;
}

h2 {
  font-size: 1.4rem;
  line-height: 1.4;
  margin-top: 2.8rem;
  margin-bottom: 0.8rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-light);
}

h3 {
  font-size: 1.15rem;
  line-height: 1.5;
  margin-top: 2rem;
  margin-bottom: 0.6rem;
  color: var(--ink-2);
}

h4 {
  font-size: 1.05rem;
  line-height: 1.5;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--ink-2);
}

/* Chinese paragraph indentation & reading rhythm */
.content p,
#quarto-document-content p {
  text-indent: 2em;
  margin-top: 0;
  margin-bottom: 1.1em;
  max-width: var(--content-max);
}

/* No indent in special contexts */
.callout p,
.callout-body p,
.callout-body-container p,
blockquote p,
.cover-box p,
.quarto-title-meta p,
figure p,
figcaption p,
.cell-output p,
.footnotes p,
li p {
  text-indent: 0 !important;
}

/* Strong / emphasis */
strong, b {
  font-weight: 700;
  color: var(--ink);
}


/* ---- Header ---- */
#quarto-header {
  background: rgba(250, 250, 248, 0.85) !important;
  border-bottom: 1px solid var(--border) !important;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}


/* ---- Sidebar ---- */
.sidebar,
#quarto-sidebar {
  background: var(--bg-sidebar) !important;
  border-right: 1px solid var(--border) !important;
}

/* Custom scrollbar */
#quarto-sidebar::-webkit-scrollbar {
  width: 3px;
}
#quarto-sidebar::-webkit-scrollbar-track {
  background: transparent;
}
#quarto-sidebar::-webkit-scrollbar-thumb {
  background: var(--ink-5);
  border-radius: 2px;
}

/* Book title in sidebar */
.sidebar-title {
  padding: 1.2rem 1rem !important;
}

.sidebar-title a {
  font-family: var(--font-heading) !important;
  font-weight: 700 !important;
  font-size: 0.95rem !important;
  color: var(--ink) !important;
  text-decoration: none !important;
  letter-spacing: -0.01em;
}

.sidebar-title span {
  font-weight: 700;
}

.sidebar h1 {
  font-size: 1.3rem;
  padding-top: 0;
}

.sidebar h1::before {
  display: none;
}

/* Nav items */
.sidebar-item-text,
.sidebar-item-text a {
  font-family: var(--font-ui) !important;
  font-size: 0.87rem !important;
  color: var(--ink-2) !important;
  line-height: 1.5;
  transition: color var(--transition);
}

/* Part headers */
.sidebar-item-section > .sidebar-item-text {
  font-weight: 600 !important;
  font-size: 0.8rem !important;
  color: var(--ink-3) !important;
  letter-spacing: 0.03em;
  padding-top: 1rem !important;
}

/* Hover */
.sidebar-item-text a:hover,
.sidebar a:hover {
  color: var(--accent) !important;
}

/* Active item */
.sidebar .active,
.sidebar .sidebar-link.active,
div.sidebar-item-container .active {
  color: var(--accent) !important;
  font-weight: 600 !important;
  background: var(--accent-subtle) !important;
  border-left: 3px solid var(--accent);
  margin-left: -1px;
}

/* Tab nav */
.nav-tabs .nav-link {
  color: var(--accent) !important;
  font-family: var(--font-ui);
}

.nav-tabs .nav-link.active {
  color: var(--accent-hover) !important;
  border-bottom-color: var(--accent) !important;
}

div.sidebar-item-container .show > .nav-link,
div.sidebar-item-container .sidebar-link > code {
  color: var(--accent) !important;
}


/* ---- Breadcrumbs ---- */
.quarto-page-breadcrumbs .breadcrumb {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--ink-4);
}


/* ---- Content Area ---- */
.content,
#quarto-document-content {
  max-width: var(--content-max);
  font-size: 1.05rem;
}

/* Content fade-in animation */
#quarto-document-content {
  animation: fadeInUp 0.45s var(--ease) both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}


/* ---- Links ---- */
.content a,
#quarto-document-content a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(15, 118, 110, 0.25);
  transition: color var(--transition), border-color var(--transition);
}

.content a:hover,
#quarto-document-content a:hover {
  color: var(--accent-hover);
  border-bottom-color: rgba(13, 93, 87, 0.55);
}

/* Don't underline heading links or nav links */
h1 a, h2 a, h3 a, h4 a,
.sidebar a,
.page-navigation a,
.toc-actions a,
nav.toc-active a {
  border-bottom: none !important;
}


/* ---- Lists ---- */
.content ul,
#quarto-document-content ul {
  list-style-type: disc;
  padding-left: 2em;
  margin-bottom: 1em;
}

.content ol,
#quarto-document-content ol {
  list-style-type: decimal;
  padding-left: 2em;
  margin-bottom: 1em;
}

.content li,
#quarto-document-content li {
  margin-bottom: 0.4em;
}


/* ---- Code Blocks ---- */
pre, code {
  font-family: var(--font-mono) !important;
  font-size: 0.88em;
}

code {
  background: var(--bg-code);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--ink-2);
}

pre {
  background: var(--bg-code) !important;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.2rem;
  overflow-x: auto;
  line-height: 1.65;
  margin: 1.5rem 0;
}

pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  font-size: 1em;
}

/* SourceCode containers (Quarto) */
div.sourceCode {
  border-radius: 8px;
  overflow: hidden;
  margin: 1.5rem 0;
}


/* ---- Blockquotes ---- */
blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.6rem 1.2rem;
  margin: 1.5rem 0;
  background: var(--accent-bg);
  border-radius: 0 8px 8px 0;
  color: var(--ink-2);
}

blockquote p {
  margin-bottom: 0.5em;
}

blockquote p:last-child {
  margin-bottom: 0;
}


/* ---- Tables ---- */
table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

table thead {
  border-bottom: 2px solid var(--border);
}

table th {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--ink-2);
  padding: 0.7rem 0.8rem;
  text-align: left;
  background: var(--bg-alt);
}

table td {
  padding: 0.7rem 0.8rem;
  border-bottom: 1px solid var(--border-light);
}

table tbody tr {
  transition: background var(--transition);
}

table tbody tr:hover {
  background: var(--accent-bg);
}


/* ---- Callouts ---- */
.callout {
  border-radius: 8px !important;
  border: 1px solid var(--border) !important;
  border-left-width: 4px !important;
  border-left-color: var(--accent) !important;
  background: var(--bg-card) !important;
  margin: 1.8rem 0 !important;
  box-shadow: var(--shadow-xs);
  overflow: hidden;
}

.callout-header {
  font-family: var(--font-heading) !important;
  font-weight: 600 !important;
  font-size: 0.95rem !important;
  padding: 0.8rem 1rem !important;
  background: transparent !important;
}

.callout-body,
.callout-body-container {
  padding: 0 1rem 0.8rem !important;
  font-size: 0.97rem;
}

/* Callout variants */
.callout-note {
  border-left-color: var(--color-note) !important;
}
.callout-note .callout-header {
  background: var(--color-note-bg) !important;
}

.callout-tip {
  border-left-color: var(--color-tip) !important;
}
.callout-tip .callout-header {
  background: var(--color-tip-bg) !important;
}

.callout-warning {
  border-left-color: var(--color-warning) !important;
}
.callout-warning .callout-header {
  background: var(--color-warning-bg) !important;
}

.callout-important {
  border-left-color: var(--color-important) !important;
}
.callout-important .callout-header {
  background: var(--color-important-bg) !important;
}

.callout-caution {
  border-left-color: var(--color-caution) !important;
}
.callout-caution .callout-header {
  background: var(--color-caution-bg) !important;
}


/* ---- Images & Figures ---- */
.content img,
#quarto-document-content img {
  border-radius: 6px;
  max-width: 100%;
  height: auto;
}

figure {
  margin: 2rem 0;
}

figcaption,
.figure-caption {
  font-family: var(--font-ui);
  font-size: 0.87rem;
  color: var(--ink-3);
  text-align: center;
  margin-top: 0.6rem;
  line-height: 1.5;
}


/* ---- Horizontal Rules ---- */
.content hr,
hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}


/* ---- Page Navigation (Prev/Next) ---- */
.page-navigation {
  border-top: 1px solid var(--border);
  margin-top: 3rem;
  padding-top: 1.5rem;
}

.page-navigation .nav-page a {
  font-family: var(--font-ui);
  color: var(--ink-2);
  text-decoration: none;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  transition: all var(--transition);
  font-size: 0.92rem;
}

.page-navigation .nav-page a:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-subtle);
}


/* ---- Right-side Table of Contents ---- */
.toc-title {
  font-family: var(--font-heading) !important;
  font-weight: 600;
  font-size: 0.78rem !important;
  color: var(--ink-4);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

nav.toc-active a {
  font-family: var(--font-ui);
  font-size: 0.84rem;
  color: var(--ink-3);
  text-decoration: none;
  transition: color var(--transition);
}

nav.toc-active a:hover {
  color: var(--accent);
}

nav.toc-active a.active {
  color: var(--accent) !important;
  font-weight: 500;
}

.toc-actions a {
  color: var(--accent) !important;
  font-size: 0.84rem;
}


/* ---- Footnotes ---- */
.footnotes {
  font-size: 0.92rem;
  color: var(--ink-3);
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-light);
}

.footnotes ol {
  padding-left: 1.2rem;
}

.footnotes li {
  margin-bottom: 0.5rem;
}

.footnote {
  text-align: left;
  margin-top: -1rem;
  margin-bottom: 1rem;
  font-size: 0.9rem;
  color: var(--ink-3);
}


/* ---- Cover / Index Page ---- */
.cover-box {
  padding: 1.5rem 2rem;
  margin: 1.5rem 0 2.5rem 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
}

.cover-img img {
  width: 50%;
  display: block;
  margin: 0 auto;
  border-radius: 6px;
  box-shadow: var(--shadow-md);
}

.cover-text h2 {
  margin-top: 1rem;
}

.cover-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.cover-actions a {
  display: inline-block;
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  text-decoration: none !important;
  color: var(--ink-2);
  background: var(--bg-card);
  font-family: var(--font-ui);
  font-size: 0.9rem;
  transition: all var(--transition);
}

.cover-actions a:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-subtle);
}

/* Title metadata (author, date) */
.quarto-title-meta {
  font-family: var(--font-ui);
  font-size: 0.92rem;
  color: var(--ink-3);
  margin-top: 0.5rem;
}


/* ---- Buttons ---- */
.btn,
.quarto-btn-toggle {
  border-radius: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  font-family: var(--font-ui);
  transition: all var(--transition);
}

.btn:hover,
.quarto-btn-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}


/* ---- Search ---- */
.aa-DetachedSearchButton {
  border-radius: 8px !important;
  border-color: var(--border) !important;
  font-family: var(--font-ui) !important;
}


/* ---- Page Grid Layout ---- */
@media (min-width: 1240px) {
  body.floating .page-columns {
    display: grid;
    gap: 0;
    grid-template-columns:
      [screen-start] 1.5em
      [screen-start-inset] 5fr
      [page-start] minmax(25px, 50px)
      [page-start-inset] minmax(50px, 150px)
      [body-start-outset] minmax(25px, 50px)
      [body-start] 4em
      [body-content-start] minmax(500px, calc(800px - 3em))
      [body-content-end] 4em
      [body-end] minmax(25px, 50px)
      [body-end-outset] minmax(50px, 150px)
      [page-end-inset] minmax(25px, 50px)
      [page-end] 5fr
      [screen-end-inset] 1.5em
      [screen-end];
  }
}


/* ---- Responsive ---- */
@media (max-width: 768px) {
  h1 {
    font-size: 1.6rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  body {
    font-size: 1rem;
    line-height: 1.85;
  }

  .content p,
  #quarto-document-content p {
    text-indent: 2em;
  }
}


/* ---- AI Conversation Blocks ---- */
.conversation {
  margin: 1.8rem 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.chat-message {
  border: 1px solid var(--border);
  border-radius: 8px;
  border-left-width: 4px;
  margin: 0.4rem 0;
  overflow: hidden;
  box-shadow: var(--shadow-xs);
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.45rem 1rem;
  font-family: var(--font-ui);
  font-size: 0.82rem;
  font-weight: 600;
  border-bottom: 1px solid var(--border-light);
}

.chat-body {
  padding: 0.8rem 1rem;
  font-size: 0.97rem;
}

.chat-body p {
  text-indent: 0 !important;
  margin-bottom: 0.7em;
}

.chat-body p:last-child {
  margin-bottom: 0;
}

.chat-body pre {
  margin: 0.8rem 0;
}

.chat-body ul,
.chat-body ol {
  margin-bottom: 0.7em;
}

/* User / Prompt messages — blue accent */
.chat-user,
.chat-prompt {
  border-left-color: var(--color-note);
  background: var(--color-note-bg);
}

.chat-user .chat-header,
.chat-prompt .chat-header {
  color: var(--color-note);
  background: rgba(3, 105, 161, 0.05);
}

/* Assistant messages — green accent */
.chat-assistant {
  border-left-color: var(--color-tip);
  background: var(--color-tip-bg);
}

.chat-assistant .chat-header {
  color: var(--color-tip);
  background: rgba(21, 128, 61, 0.05);
}

/* Copy button */
.chat-copy-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 10px;
  font-family: var(--font-ui);
  font-size: 0.76rem;
  color: var(--ink-3);
  cursor: pointer;
  transition: all var(--transition);
  line-height: 1.6;
}

.chat-copy-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-subtle);
}


/* ---- Print ---- */
@media print {
  .sidebar,
  #quarto-sidebar,
  #quarto-header {
    display: none !important;
  }

  body {
    background: white;
    color: black;
    font-size: 11pt;
  }

  h1::before {
    display: none;
  }

  #quarto-document-content {
    animation: none;
  }

  a {
    color: black !important;
    border-bottom: none !important;
  }
}