@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;700&family=Spectral:ital,wght@0,400;0,700;1,400;1,700&display=swap');

:root {
  /* BG3 Theme Colors */
  --c-bg-outer: #0d0c08;
  --c-bg-paper: #110f0b;
  --c-text-main: #fde9d4;
  --c-text-muted: #88705a;
  --c-text-strong: #fef0e2;
  --c-accent: #c19976;
  --c-accent-hover: #97785d;
  --c-border: #574b3c;
  
  /* Heading Gradient */
  --grad-start: #fef1e4;
  --grad-end: #fbcfa0;

  /* Cross-platform Font Stacks */
  --font-serif: "Spectral", "Noto Serif SC", "Georgia", "Times New Roman", "Times", "Songti SC", "STSong", "PingFang SC", "PingFang TC", "Noto Serif CJK SC", "Source Han Serif SC", "SimSun", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", "Arial", sans-serif;
}

*, *::before, *::after {
  box-sizing: border-box;
}

body {
  background-color: var(--c-bg-outer);
  color: var(--c-text-main);
  font-family: var(--font-serif);
  line-height: 1.6;
  margin: 0;
  padding: 0;
  transition: padding-right 0.3s ease;
  padding-right: 300px; /* Default open on desktop */
}

body.toc-closed {
  padding-right: 0;
}

/* -------------------------------------------------------------------------
   Layout (Matching general.css)
   ------------------------------------------------------------------------- */
#preface, #chapters, #afterword {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

/* -------------------------------------------------------------------------
   Typography & Headings
   ------------------------------------------------------------------------- */
h1, h2, h3, .heading {
  font-family: var(--font-serif);
  font-weight: 700;
  background: linear-gradient(to right, var(--grad-start), var(--grad-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  color: transparent; /* Fallback */
  text-align: center;
  margin-bottom: 1rem;
}

/* Invisible headings to help Calibre make a Table of Contents */
.toc-heading { display: none; }

/* -------------------------------------------------------------------------
   Meta Tags & Preface
   ------------------------------------------------------------------------- */
p.message {
  text-align: center;
  margin-bottom: 2rem;
  color: var(--c-text-muted);
}

/* Collapsible Meta Tags (Details/Summary) */
details.meta-details {
  margin: 2rem auto 3rem;
  border: none;
  background: rgba(255, 255, 255, 0.02);
  position: relative;
}

details.meta-details::before,
details.meta-details::after {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  height: 30px;
  background: url('assets/frame-decor.svg') center no-repeat;
  background-size: contain;
}

details.meta-details::before {
  top: -15px;
}

details.meta-details::after {
  bottom: -15px;
}

details.meta-details summary {
  padding: 1rem 1.5rem;
  font-family: var(--font-sans);
  font-weight: bold;
  font-size: 1rem;
  color: var(--c-text-strong);
  text-transform: uppercase;
  letter-spacing: 1px;
  cursor: pointer;
  list-style: none;
  text-align: center;
  border-bottom: 1px solid transparent;
}

details.meta-details summary::-webkit-details-marker {
  display: none;
}

details.meta-details summary::before {
  content: "+ ";
  color: var(--c-accent);
}

details.meta-details[open] summary::before {
  content: "- ";
}

details.meta-details[open] summary {
  border-bottom: 1px solid var(--c-accent);
}

details.meta-details .meta dl.tags,
details.meta-details dl.tags {
  border: none;
  box-shadow: none;
  margin: 0;
  max-width: none;
  background: transparent;
}

.meta dl.tags {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.8rem 1.5rem;
  text-align: left;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  padding: 1.5rem;
  margin: 2rem auto 3rem auto;
  border: none;
  background: rgba(255, 255, 255, 0.02);
  color: var(--c-text-main);
  position: relative;
}

.meta dl.tags::before,
.meta dl.tags::after {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  height: 30px;
  background: url('assets/frame-decor.svg') center no-repeat;
  background-size: contain;
}

.meta dl.tags::before {
  top: -15px;
}

.meta dl.tags::after {
  bottom: -15px;
}

details.meta-details .meta dl.tags::before,
details.meta-details .meta dl.tags::after,
details.meta-details dl.tags::before,
details.meta-details dl.tags::after {
  display: none;
}

.meta dl.tags dt {
  font-weight: bold;
  color: var(--c-accent);
  text-align: right;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 0.85rem;
}

.meta dl.tags dd {
  margin: 0;
}

.meta dl.tags a {
  color: var(--c-text-strong);
  text-decoration: none;
}
.meta dl.tags a:hover {
  text-decoration: underline;
  color: var(--c-accent);
}

.byline {
  text-align: center;
  font-family: var(--font-sans);
  font-size: 1.1rem;
  color: var(--c-text-muted);
  margin-bottom: 2rem;
}

.byline a {
  color: var(--c-accent);
  text-decoration: none;
}
.byline a:hover {
  color: var(--c-accent-hover);
}

/* Quote / Summary */
.meta blockquote.userstuff {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--c-text-strong);
  background: transparent;
  border: none;
  padding: 1.5rem 2rem;
  margin: 2rem auto 1rem auto;
  text-align: center;
  font-style: italic;
}

/* Chapter Headings */
.meta.group .heading {
  font-size: 1.8rem;
  border-top: none;
  border-bottom: none;
  padding: 2rem 0;
  margin: 1rem 0 2rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  position: relative;
}

.meta.group .heading::before,
.meta.group .heading::after {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 15px;
  background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 20" preserveAspectRatio="none"><polygon points="100,4 104,10 100,16 96,10" fill="%23c19976"/><circle cx="10" cy="10" r="1.5" fill="%23c19976"/><circle cx="190" cy="10" r="1.5" fill="%23c19976"/><path d="M10,10 C40,0 60,20 92,10" fill="none" stroke="%23c19976" stroke-width="1"/><path d="M108,10 C140,20 160,0 190,10" fill="none" stroke="%23c19976" stroke-width="1"/></svg>') center no-repeat;
  background-size: 100% 100%;
}

.meta.group .heading::before {
  top: -5px;
}

.meta.group .heading::after {
  bottom: -5px;
}

/* -------------------------------------------------------------------------
   Content (Userstuff)
   ------------------------------------------------------------------------- */
.userstuff {
  font-size: 1.1rem;
  color: var(--c-text-main);
}

.userstuff p {
  text-align: justify;
  margin-bottom: 1.2em;
  text-indent: 2em;
}

/* -------------------------------------------------------------------------
   BG3 Custom Elements (Adapted from provided CSS)
   ------------------------------------------------------------------------- */
.dice-options {
  border: none;
  padding: 15px;
  margin: 1.5em 0;
  background-color: var(--c-bg-paper);
  font-family: var(--font-sans);
  font-size: 0.95em;
  border-radius: 4px;
}

.dice-options ol,
.dice-options li {
  list-style: none !important;
  padding: 0 !important;
  margin: 0 !important;
  text-indent: 0 !important;
}

.roll-list li {
  display: flex;
  align-items: center;
  padding: 0.1em 0.5em;
}

.roll-list li > span:first-child {
  flex-basis: 150px;
  flex-shrink: 0;
  margin-right: 1em;
}

.graytext {
  color: var(--c-text-muted);
  white-space: pre;
  font-family: "Courier New", Courier, monospace;
}

.text {
  color: var(--c-text-strong);
  font-family: var(--font-sans);
  font-size: 0.9em;
}

.align-right {
  color: var(--c-text-muted);
  text-align: right;
  padding-left: 1em;
}

.choice {
  color: var(--c-text-strong);
  font-family: var(--font-serif);
  font-size: 1em;
}

.choice:hover {
  color: var(--c-bg-outer);
  background-color: #f1ebdb;
}

.chosen {
  color: var(--c-accent);
  text-decoration: underline;
  text-decoration-color: var(--c-accent);
  font-weight: bold;
  font-family: var(--font-serif);
  font-size: 1em;
}

.chosen:hover {
  color: var(--c-accent-hover);
  background-color: #f1ebdb;
}

.success:hover .choice,
.success:hover .chosen,
.success:hover .dice {
  background-color: #396088 !important;
}

.fail:hover .choice,
.fail:hover .chosen,
.fail:hover .dice {
  background-color: #690f04 !important;
}

.dice {
  color: #54cf02;
  font-family: 'Courier New', monospace;
  font-weight: bold;
  font-smooth: never;
  -webkit-font-smoothing: none;
}

.dice:hover {
  color: #a0ff5a;
}

/* Character Colors */
.redbull { color: #2f3ff0; font-weight: bold; white-space: pre; font-family: "Trebuchet MS", "Avantgarde", "TeX Gyre Adventor", "URW Gothic L", "Futura", sans-serif; }
.ferrari { color: #EF1A2D; font-weight: bold; white-space: pre; font-family: "Apple Chancery", "Snell Roundhand", "URW Chancery L", "Brush Script MT", "Lucida Handwriting", cursive; }
.williams { color: #00A0DE; font-weight: bold; white-space: pre; font-family: "Arial", "Noto Sans", sans-serif; }
.amg { color: #00A19B; font-weight: bold; white-space: pre; font-family: "Palatino", "URW Palladio L", "Times", "Times New Roman", serif; }
.mclaren { color: #FF8000; white-space: pre; font-family: "Franklin Gothic Bold", "Impact", "Haettenschweiler", "Roboto Black", fantasy; }
.haas { color: #E6002B; white-space: pre; font-family: "Verdana", "Helvetica", sans-serif; }
.alpine { color: #EC0374; font-weight: bold; white-space: pre; font-family: "Georgia", "Didot", "Book Antiqua", serif; }

.textchoice1 {
  color: var(--c-text-main);
  padding-left: 1em;
}

.aligned {
  color: var(--c-text-main);
  font-family: monospace;
}

.handwriting {
  color: var(--c-accent);
  font-family: 'STKaiTi', cursive, var(--font-serif);
  font-style: italic;
}

/* In-game Books and Letters */
.book-text, .letter {
  font-family: var(--font-serif);
  border-left: 4px solid var(--c-accent);
  padding: 15px 20px;
  margin: 20px auto;
  color: #110f0b;
  background-color: #f1ebdb;
  width: 90%;
  max-width: 700px;
  font-size: 1.1em;
  text-indent: 0 !important;
}

.book-text p, .letter p {
  text-indent: 0 !important;
  color: #110f0b;
}

.text-gray {
  color: var(--c-text-muted) !important;
}

.text-large {
  font-size: 1.1em;
  line-height: 1.35;
}

/* Darkmode Block (Used for character info) */
.darkmode {
  background-color: rgba(255, 255, 255, 0.03);
  border: none;
  border-radius: 8px;
  padding: 2em;
  margin: 2em auto;
  text-indent: 0;
}

.darkmode h1, .darkmode h2 {
  text-indent: 0;
  text-align: center;
  margin-top: 1em;
  margin-bottom: 0.5em;
}

.darkmode h1:first-child {
  margin-top: 0;
}

.darkmode .text {
  color: var(--c-accent);
}

.darkmode .normtext {
  color: var(--c-text-main);
  text-indent: 0;
}

.darkmode .normtext p {
  text-indent: 0;
}

.darkmode a:link {
  color: var(--c-text-strong);
}

.darkmode details summary .text {
  text-decoration: underline;
}

.darkmode a:hover {
  color: var(--c-bg-outer);
  background-color: #f1ebdb;
}

.darkmode a:visited {
  color: var(--c-accent);
}

.darkmode a:visited:hover {
  color: var(--c-accent-hover);
  background-color: #f1ebdb;
}

hr {
  border: none;
  height: 15px;
  background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 20" preserveAspectRatio="none"><polygon points="100,4 104,10 100,16 96,10" fill="%23c19976"/><circle cx="10" cy="10" r="1.5" fill="%23c19976"/><circle cx="190" cy="10" r="1.5" fill="%23c19976"/><path d="M10,10 C40,0 60,20 92,10" fill="none" stroke="%23c19976" stroke-width="1"/><path d="M108,10 C140,20 160,0 190,10" fill="none" stroke="%23c19976" stroke-width="1"/></svg>') center no-repeat;
  background-size: 60% 100%;
  margin: 2rem 0;
}

/* -------------------------------------------------------------------------
   TOC Sidebar
   ------------------------------------------------------------------------- */
#toc-sidebar {
  position: fixed;
  top: 0;
  right: 0;
  width: 300px;
  height: 100vh;
  background: var(--c-bg-paper);
  border-left: 2px solid var(--c-border);
  box-shadow: -4px 0 10px rgba(0,0,0,0.5);
  font-family: var(--font-serif);
  z-index: 1000;
  transition: transform 0.3s ease;
  display: flex;
  flex-direction: column;
}

body.toc-closed #toc-sidebar {
  transform: translateX(100%);
}

#toc-toggle-btn {
  position: absolute;
  left: -54px;
  top: 2rem;
  width: 44px;
  height: 44px;
  background: transparent;
  color: var(--c-accent);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-family: var(--font-serif);
  font-weight: normal;
  transition: all 0.3s ease;
  z-index: 1000;
}

#toc-toggle-btn:hover {
  color: var(--c-accent-hover);
  transform: scale(1.05);
}

#toc-toggle-btn .toc-btn-text {
  display: none;
}

#toc-toggle-btn .toc-btn-icon {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 24px;
  height: 24px;
  position: relative;
}

#toc-toggle-btn .line {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  height: 2px;
  background-size: 100% 100%;
  background-repeat: no-repeat;
  background-position: center;
  transition: all 0.3s ease;
}

#toc-toggle-btn .line-1 {
  width: 24px;
  background-image: url('assets/burger-1.svg');
  top: 6px;
}

#toc-toggle-btn .line-2 {
  width: 19px;
  background-image: url('assets/burger-2.svg');
  top: 11px;
}

#toc-toggle-btn .line-3 {
  width: 24px;
  background-image: url('assets/burger-3.svg');
  top: 16px;
}

body:not(.toc-closed) #toc-toggle-btn .line-1 {
  transform: translate(-50%, 5px) rotate(45deg);
}
body:not(.toc-closed) #toc-toggle-btn .line-2 {
  opacity: 0;
  transform: translate(-50%, 0) scale(0.1);
}
body:not(.toc-closed) #toc-toggle-btn .line-3 {
  transform: translate(-50%, -5px) rotate(-45deg);
}

body.toc-closed #toc-toggle-btn:hover .line-2 {
  transform: translate(calc(-50% + 4px), 0);
}

#toc-sidebar .toc-content {
  padding: 2.5rem 0;
  overflow-y: auto;
  flex: 1;
}

#toc-sidebar h3 {
  margin-top: 0;
  font-size: 1.8rem;
  background: linear-gradient(to right, #fef0e2, #c19976);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  color: transparent;
  border-bottom: none;
  padding-bottom: 1.5rem;
  margin: 0 2.5rem 2rem 2.5rem;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 2px;
  display: block;
  position: relative;
}

#toc-sidebar h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 12px;
  background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 20" preserveAspectRatio="none"><path d="M0,10 Q25,0 50,10 T100,10" fill="none" stroke="%23c19976" stroke-width="2"/><path d="M0,10 Q25,20 50,10 T100,10" fill="none" stroke="%23c19976" stroke-width="1"/></svg>') repeat-x;
  background-size: 80px 100%;
}

#toc-sidebar ul {
  list-style: none;
  padding: 0 2.5rem;
  margin: 0;
  counter-reset: chapter;
}

#toc-sidebar li {
  margin-bottom: 1.2rem;
  position: relative;
}

#toc-sidebar a {
  text-decoration: none;
  color: var(--c-text-main);
  transition: all 0.2s;
  display: block;
  padding: 0.5rem 0;
  border-bottom: 1px dotted var(--c-text-muted);
  font-size: 1.05rem;
  position: relative;
}

#toc-sidebar a::before {
  counter-increment: chapter;
  content: "CH. " counter(chapter) " \2014 ";
  font-size: 0.85em;
  color: var(--c-text-muted);
  font-family: var(--font-serif);
  text-transform: uppercase;
  margin-right: 0.5rem;
}

#toc-sidebar a:hover, #toc-sidebar a.active {
  color: var(--c-accent);
  font-weight: bold;
}

#toc-sidebar a:hover::after, #toc-sidebar a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(to right, var(--grad-start), var(--grad-end));
}

/* 响应式设计 */
@media (max-width: 1024px) {
  body {
    padding-right: 0 !important;
  }
  
  #toc-sidebar {
    width: 100vw;
    border-left: none;
  }
  
  body:not(.toc-closed) #toc-toggle-btn {
    position: absolute;
    left: 1rem;
    top: 1rem;
    width: 44px;
    height: 44px;
    background: transparent;
    border: none;
    z-index: 1001;
  }
  
  body.toc-closed #toc-toggle-btn {
    position: absolute;
    left: -54px;
    right: auto;
    top: 2rem;
    transform: none;
    width: 44px;
    height: 44px;
    font-size: 1.5rem;
    background: transparent;
    border: none;
    z-index: 1001;
  }
}

@media (max-width: 768px) {
  #preface, #chapters, #afterword {
    padding: 2rem 2.5rem; /* 左右对称的 padding，增加到 2.5rem 约 40px，确保不被 26px 的按钮遮挡 */
  }
  .userstuff p {
    text-indent: 0;
  }
  
  /* Mobile Meta Tags Layout */
  .meta dl.tags {
    display: block;
    padding: 1rem;
  }
  .meta dl.tags dt {
    text-align: left;
    margin-top: 1.2rem;
  }
  .meta dl.tags dt:first-child {
    margin-top: 0;
  }
  .meta dl.tags dd {
    margin-left: 0;
    margin-top: 0.3rem;
  }
}