/* 共读 · 暖色阅读风格（陶土色 + 米色，参考 cyy_second_brain_app 的「寻常」配色） */

:root {
  --terracotta: #B56A4C;
  --terracotta-deep: #9E583D;
  --terracotta-soft: rgba(181, 106, 76, 0.10);
  --beige: #F8F1E6;
  --beige-deep: #F1E7D5;
  --track: #E8DCC8;
  --paper: #FCF7EC;
  --ink: #4A3F35;
  --ink-soft: rgba(74, 63, 53, 0.68);
  --ink-faint: rgba(74, 63, 53, 0.60);
  --serif: Georgia, "Times New Roman", "Songti SC", "Noto Serif SC", "STSong", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  /* 正文中文字体：拉丁字符仍走 Georgia，仅中文回落到阿里巴巴普惠体 2.0 */
  --serif-cjk-light: Georgia, "Times New Roman", "AlibabaPuHuiTi2-45L", "Songti SC", "Noto Serif SC", "STSong", serif;
  --serif-cjk-bold: Georgia, "Times New Roman", "AlibabaPuHuiTi2-55R", "Songti SC", "Noto Serif SC", "STSong", serif;
}

/* 阿里巴巴普惠体 2.0：非加粗 45 Light，加粗 55 Regular */
@font-face {
  font-family: "AlibabaPuHuiTi2-45L";
  font-style: normal;
  font-weight: 100 500;
  font-display: swap;
  src: url("https://cdn.jsdelivr.net/npm/@fontpkg/alibaba-pu-hui-ti-2-0/AlibabaPuHuiTi-2-45-Light.ttf") format("truetype");
}

@font-face {
  font-family: "AlibabaPuHuiTi2-55R";
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url("https://cdn.jsdelivr.net/npm/@fontpkg/alibaba-pu-hui-ti-2-0/AlibabaPuHuiTi-2-55-Regular.ttf") format("truetype");
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--beige);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.7;
}

::selection { background: rgba(181, 106, 76, 0.22); }

a { color: inherit; }

button { font-family: inherit; cursor: pointer; }

.app { display: flex; min-height: 100vh; }

/* ---------------- 侧边栏 ---------------- */

.sidebar {
  width: 268px;
  flex: 0 0 268px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  padding: 34px 22px 26px;
  border-right: 1px solid var(--track);
  display: flex;
  flex-direction: column;
  transition: width 0.26s ease, flex-basis 0.26s ease, padding 0.26s ease, opacity 0.2s ease;
}

/* 侧边栏收起按钮（位于侧边栏右上角） */
.sidebar-collapse {
  position: absolute;
  top: 30px;
  right: 16px;
  display: none;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  padding: 0;
  font-size: 15px;
  line-height: 1;
  color: var(--ink-faint);
  background: transparent;
  border: 1px solid var(--track);
  border-radius: 8px;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.sidebar-collapse:hover {
  color: var(--terracotta);
  border-color: rgba(181, 106, 76, 0.45);
  background: rgba(232, 220, 200, 0.55);
}

/* 侧边栏展开按钮（收起后浮动显示） */
.sidebar-reopen {
  display: none;
  position: fixed;
  top: 18px;
  left: 16px;
  z-index: 15;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  font-size: 17px;
  line-height: 1;
  color: var(--ink-soft);
  background: var(--paper);
  border: 1px solid var(--track);
  border-radius: 9px;
  box-shadow: 0 6px 18px -12px rgba(74, 63, 53, 0.5);
  transition: color 0.15s, border-color 0.15s;
}

.sidebar-reopen:hover {
  color: var(--terracotta);
  border-color: rgba(181, 106, 76, 0.5);
}

/* 桌面端：显示收起按钮，并在 sidebar-collapsed 时收起侧边栏 */
@media (min-width: 901px) {
  .sidebar-collapse { display: flex; }

  .app.sidebar-collapsed .sidebar {
    width: 0;
    flex-basis: 0;
    padding-left: 0;
    padding-right: 0;
    border-right-color: transparent;
    opacity: 0;
    overflow: hidden;
    pointer-events: none;
  }

  .app.sidebar-collapsed .sidebar-reopen { display: flex; }
}

.brand { padding: 0 10px; }

.brand-rule {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--terracotta);
  margin-bottom: 16px;
}

.brand-title {
  display: inline-block;
  margin: 0;
  font-family: var(--serif);
  font-size: 27px;
  font-weight: 500;
  letter-spacing: 0.22em;
  color: var(--ink);
  text-decoration: none;
  cursor: pointer;
  transition: color 0.15s;
}

.brand-title:hover { color: var(--terracotta); }

.brand-sub {
  margin: 8px 0 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}

.search { display: block; margin: 24px 6px 0; }

.search input {
  width: 100%;
  padding: 9px 13px;
  font-family: inherit;
  font-size: 13px;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--track);
  border-radius: 9px;
  outline: none;
  transition: border-color 0.18s, box-shadow 0.18s;
}

.search input::placeholder { color: var(--ink-faint); letter-spacing: 0.04em; }

.search input:focus {
  border-color: var(--terracotta);
  box-shadow: 0 0 0 3px var(--terracotta-soft);
}

.nav { margin-top: 20px; flex: 1; }

.nav-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  width: 100%;
  padding: 8px 12px;
  border: none;
  border-radius: 9px;
  background: transparent;
  font-size: 14px;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
  text-align: left;
  transition: background 0.15s, color 0.15s;
}

.nav-item:hover { background: rgba(232, 220, 200, 0.55); color: var(--ink); }

.nav-item.active {
  background: var(--terracotta-soft);
  color: var(--terracotta);
  font-weight: 500;
}

.nav-item .count {
  font-size: 11.5px;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}

.nav-item.active .count { color: rgba(181, 106, 76, 0.72); }

.nav-category { margin-top: 6px; font-weight: 500; color: var(--ink); }

/* 分类展开 / 折叠 */
.nav-cat { margin-top: 6px; }

.nav-cat-row { display: flex; align-items: center; gap: 2px; }

.nav-cat-row .nav-category { margin-top: 0; flex: 1; min-width: 0; }

.nav-cat-toggle {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 30px;
  padding: 0;
  background: transparent;
  border: none;
  border-radius: 7px;
  color: var(--ink-faint);
  transition: color 0.15s, background 0.15s;
}

.nav-cat-toggle:hover { color: var(--terracotta); background: rgba(232, 220, 200, 0.55); }

.nav-cat-toggle .caret {
  width: 0;
  height: 0;
  border-left: 5px solid currentColor;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  transition: transform 0.18s ease;
}

.nav-cat:not(.collapsed) .nav-cat-toggle .caret { transform: rotate(90deg); }

.nav-cat.collapsed .nav-sub,
.nav-cat.collapsed .nav-empty { display: none; }

.nav-sub {
  margin: 1px 0 1px 18px;
  padding-left: 8px;
  border-left: 1px solid var(--track);
}

.nav-sub .nav-item { font-size: 13px; padding: 6px 10px; }

.nav-empty {
  margin: 2px 0 2px 27px;
  font-size: 12px;
  color: var(--ink-faint);
}

.sidebar-foot {
  margin-top: 22px;
  padding: 16px 10px 0;
  border-top: 1px solid var(--track);
  font-size: 11.5px;
  line-height: 1.9;
  letter-spacing: 0.03em;
  color: var(--ink-faint);
}

.sidebar-foot code {
  font-family: var(--mono);
  font-size: 10.5px;
  background: var(--beige-deep);
  border-radius: 4px;
  padding: 1px 5px;
}

/* ---------------- 主区域 ---------------- */

.main { flex: 1; min-width: 0; }

.topbar {
  display: none;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--track);
  background: var(--beige);
  position: sticky;
  top: 0;
  z-index: 10;
}

.menu-btn {
  padding: 6px 14px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  background: var(--paper);
  border: 1px solid var(--track);
  border-radius: 8px;
}

.topbar-title {
  font-family: var(--serif);
  font-size: 17px;
  letter-spacing: 0.2em;
  color: var(--ink);
}

.content {
  max-width: 860px;
  margin: 0 auto;
  padding: 60px 52px 110px;
}

/* ---------------- 列表 ---------------- */

.list-head { margin-bottom: 30px; }

.list-head h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: 23px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--ink);
}

.list-meta {
  margin: 10px 0 0;
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--ink-faint);
}

.cards { display: flex; flex-direction: column; gap: 14px; }

.card {
  display: block;
  padding: 21px 24px 19px;
  background: var(--paper);
  border: 1px solid var(--track);
  border-radius: 13px;
  text-decoration: none;
  transition: border-color 0.18s, box-shadow 0.18s, transform 0.18s;
}

.card:hover {
  border-color: rgba(181, 106, 76, 0.45);
  box-shadow: 0 10px 26px -18px rgba(74, 63, 53, 0.45);
  transform: translateY(-1px);
}

.card-title {
  margin: 0;
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 500;
  line-height: 1.55;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.card-summary {
  margin: 9px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-soft);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-meta {
  margin: 14px 0 0;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--ink-faint);
}

.card-source {
  color: var(--terracotta);
  background: var(--terracotta-soft);
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 11.5px;
}

/* ---------------- 空状态 ---------------- */

.empty {
  padding: 76px 20px;
  text-align: center;
}

.empty-title {
  font-family: var(--serif);
  font-size: 18px;
  letter-spacing: 0.12em;
  color: var(--ink-soft);
}

.empty-hint {
  margin-top: 14px;
  font-size: 13px;
  line-height: 2.1;
  color: var(--ink-faint);
}

.empty-hint code {
  font-family: var(--mono);
  font-size: 12px;
  background: var(--beige-deep);
  border-radius: 5px;
  padding: 2px 7px;
}

/* ---------------- 阅读视图 ---------------- */

.reader { max-width: 700px; margin: 0 auto; }

.reader-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

.reader-lang {
  display: flex;
  align-items: center;
  gap: 12px;
}

.reader-note {
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--ink-faint);
}

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--track);
  border-radius: 8px;
  overflow: hidden;
  background: var(--paper);
}

.lang-pill {
  padding: 6px 15px;
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  background: transparent;
  border: none;
  transition: color 0.15s, background 0.15s;
}

.lang-pill + .lang-pill { border-left: 1px solid var(--track); }

.lang-pill:hover { color: var(--terracotta); }

.lang-pill.active {
  background: var(--terracotta-soft);
  color: var(--terracotta);
  font-weight: 500;
}

.ghost-btn {
  padding: 7px 15px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid var(--track);
  border-radius: 8px;
  transition: color 0.15s, border-color 0.15s;
}

.ghost-btn:hover { color: var(--terracotta); border-color: rgba(181, 106, 76, 0.55); }

.reader-title {
  margin: 0;
  font-family: var(--serif-cjk-bold);
  font-size: 29px;
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.reader-meta {
  margin: 16px 0 0;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--track);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
}

.reader-body {
  font-family: var(--serif-cjk-light);
  font-size: 17px;
  line-height: 1.95;
  color: var(--ink);
  padding-top: 30px;
  overflow-wrap: break-word;
}

.reader-body p { margin: 1.05em 0; }

.reader-body strong, .reader-body b { font-family: var(--serif-cjk-bold); }

.reader-body h2, .reader-body h3, .reader-body h4 {
  font-family: var(--serif-cjk-bold);
  font-weight: 600;
  line-height: 1.5;
  margin: 1.9em 0 0.75em;
}

.reader-body h2 { font-size: 22px; }
.reader-body h3 { font-size: 19px; }
.reader-body h4 { font-size: 17px; }

.reader-body a {
  color: var(--terracotta);
  text-decoration: none;
  border-bottom: 1px solid rgba(181, 106, 76, 0.35);
  transition: border-color 0.15s;
}

.reader-body a:hover { border-bottom-color: var(--terracotta); }

.reader-body img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 1.6em auto;
  border-radius: 9px;
}

.reader-body blockquote {
  margin: 1.5em 0;
  padding: 13px 20px;
  border-left: 3px solid rgba(181, 106, 76, 0.55);
  border-radius: 0 9px 9px 0;
  background: rgba(181, 106, 76, 0.05);
  color: var(--ink-soft);
}

.reader-body hr {
  border: none;
  border-top: 1px solid var(--track);
  margin: 2.4em 0;
}

.reader-body ul, .reader-body ol { padding-left: 1.5em; }

.reader-body li { margin: 0.4em 0; }

.reader-body code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--beige-deep);
  border-radius: 5px;
  padding: 2px 6px;
}

.reader-body pre {
  background: var(--beige-deep);
  border: 1px solid var(--track);
  border-radius: 9px;
  padding: 16px 18px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.7;
}

.reader-body pre code { background: transparent; padding: 0; }

.reader-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  margin: 1.5em 0;
}

.reader-body th, .reader-body td {
  border: 1px solid var(--track);
  padding: 8px 11px;
  text-align: left;
}

.reader-body th { background: var(--beige-deep); }

.reader-body figcaption {
  font-family: var(--sans);
  font-size: 12.5px;
  text-align: center;
  color: var(--ink-faint);
  margin-top: -0.8em;
}

.reader-foot {
  margin-top: 58px;
  padding-top: 28px;
  border-top: 1px solid var(--track);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.btn {
  display: inline-block;
  padding: 11px 24px;
  background: var(--terracotta);
  color: #FFF9F2;
  border: none;
  border-radius: 9px;
  font-size: 14px;
  letter-spacing: 0.1em;
  text-decoration: none;
  box-shadow: 0 8px 20px -12px rgba(181, 106, 76, 0.9);
  transition: background 0.16s;
}

.btn:hover { background: var(--terracotta-deep); }

/* ---------------- 移动端 ---------------- */

.scrim {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(74, 63, 53, 0.3);
  z-index: 20;
}

@media (max-width: 900px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: 30;
    background: var(--beige);
    transform: translateX(-104%);
    transition: transform 0.24s ease;
    box-shadow: 12px 0 32px -20px rgba(74, 63, 53, 0.5);
  }

  .sidebar.open { transform: none; }

  .scrim.show { display: block; }

  .topbar { display: flex; }

  .content { padding: 34px 22px 84px; }

  .list-head h2 { font-size: 20px; }

  .card { padding: 18px 18px 16px; }

  .reader-title { font-size: 23px; }

  .reader-body { font-size: 16px; line-height: 1.9; }
}