/* ==========================================================
   经典书导读 · 样式系统 (Douban Editorial Style System)
   ========================================================== */

:root {
  --green: #007722;
  --green-hover: #005f1b;
  --green-subtle: #f0f7f2;
  --green-border: #c8e6d2;
  --star-color: #e09015;
  --star-empty: #dcd9d0;
  
  --ink: #1a1a1a;
  --ink-secondary: #3d3d3d;
  --muted: #6e6e6e;
  --faint: #999999;
  
  --paper: #ffffff;
  --soft: #f8f7f4;
  --soft-hover: #f1efe9;
  --hair: #e8e5de;
  --hair-strong: #d0ccc0;
  
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  --display: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  --serif: var(--sans);
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-pill: 999px;
  
  --shadow-cover: 0 3px 10px rgba(0, 0, 0, 0.12), 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-cover-hover: 0 6px 18px rgba(0, 0, 0, 0.16), 0 2px 5px rgba(0, 0, 0, 0.1);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.04);
}

/* Base reset & typography */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 3.8rem;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: #d4ebd9;
  color: var(--ink);
}

a {
  color: var(--green);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--green-hover);
}

h1, h2, h3 {
  font-family: var(--display);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.015em;
}

p {
  margin: 0 0 1rem;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.tabular {
  font-variant-numeric: tabular-nums;
}

/* Page Layout */
.wrap {
  max-width: 46rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header & Brand */
.sitehead {
  border-bottom: 1px solid var(--hair);
  padding: 1rem 0;
}

.sitehead-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.sitehead-left {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  min-width: 0;
}

.sitehead .brand {
  font-family: var(--display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  display: inline-flex;
  align-items: baseline;
  gap: 0.6rem;
  letter-spacing: -0.015em;
  white-space: nowrap;
}

.sitehead .brand small {
  font-family: var(--sans);
  font-weight: 500;
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.sitehead-tag {
  font-size: 0.74rem;
  color: var(--green);
  background: var(--green-subtle);
  border: 1px solid var(--green-border);
  padding: 0.16rem 0.55rem;
  border-radius: var(--radius-pill);
  font-family: var(--sans);
  font-weight: 500;
  white-space: nowrap;
  flex-shrink: 0;
}

/* Hero Section (Index) */
.hero {
  padding: 2.2rem 0 1.4rem;
}

.hero h1 {
  font-size: 1.85rem;
  margin: 0 0 0.5rem;
  line-height: 1.35;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.7rem;
}

.hero h1 .hero-subtitle {
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: normal;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.hero p {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.7;
  margin: 0 0 1.2rem;
}

/* Search Bar */
.search-box {
  position: relative;
  margin: 0 0 1.6rem;
}

.search-input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 0.9rem;
  width: 16px;
  height: 16px;
  fill: none;
  stroke: var(--muted);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 0.65rem 2.4rem 0.65rem 2.4rem;
  font-size: 0.92rem;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--soft);
  border: 1px solid var(--hair-strong);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color 0.18s ease, background 0.18s ease, box-shadow 0.18s ease;
}

.search-input:focus {
  background: var(--paper);
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(0, 119, 34, 0.12);
}

.search-clear {
  position: absolute;
  right: 0.7rem;
  display: none;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border: none;
  background: var(--hair);
  color: var(--muted);
  border-radius: 50%;
  font-size: 13px;
  cursor: pointer;
  line-height: 1;
}

.search-clear:hover {
  background: var(--hair-strong);
  color: var(--ink);
}

.search-meta {
  display: none;
  margin-top: 0.5rem;
  font-size: 0.82rem;
  color: var(--muted);
}

.search-meta b {
  color: var(--green);
}

/* Sticky Domain Navigation Bar (Architectural Underline Tabs) */
.dnav {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--hair);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
}

.dnav-inner {
  max-width: 46rem;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  gap: 1.6rem;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.dnav-inner::-webkit-scrollbar {
  display: none;
}

.dnav a {
  position: relative;
  flex: 0 0 auto;
  padding: 0.82rem 0.1rem;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  background: transparent;
  border: none;
  transition: color 0.18s ease;
}

.dnav a:hover {
  color: var(--ink);
}

.dnav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--green);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

.dnav a.active {
  color: var(--ink);
  font-weight: 600;
}

.dnav a.active::after {
  transform: scaleX(1);
}

/* Domain Sections */
.domain {
  padding: 2.5rem 0 0.8rem;
  scroll-margin-top: 60px;
}

.domain-header {
  margin-bottom: 1rem;
}

.domain h2 {
  font-size: 1.35rem;
  margin: 0 0 0.4rem;
  color: var(--ink);
  letter-spacing: -0.015em;
}

.domain .intro {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.7;
  margin: 0;
}

/* Book Rows (Clean Editorial List) */
.book-list {
  border-top: 1px solid var(--hair);
  margin-top: 1rem;
}

.brow {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  padding: 1.15rem 0.65rem;
  margin: 0 -0.65rem;
  border-bottom: 1px solid var(--hair);
  text-decoration: none;
  color: var(--ink);
  border-radius: var(--radius-md);
  contain: layout;
  transition: background 0.15s ease;
}

.brow:hover {
  background: var(--soft);
}

.brow-cover-wrap {
  flex: 0 0 68px;
  width: 68px;
}

.brow-cover-wrap picture {
  display: block;
  width: 100%;
}

.brow-cover-wrap img {
  width: 100%;
  height: auto;
  border-radius: 3px;
  box-shadow: var(--shadow-cover);
  border: 1px solid rgba(0, 0, 0, 0.05);
  aspect-ratio: 2 / 2.9;
  object-fit: cover;
  background: var(--soft);
}

.brow-body {
  flex: 1 1 auto;
  min-width: 0;
}

.brow-title {
  font-family: var(--display);
  font-size: 1.08rem;
  font-weight: 600;
  margin: 0 0 0.3rem;
  line-height: 1.45;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.brow-title .brow-name {
  color: var(--ink);
}

.brow-meta {
  font-size: 0.82rem;
  color: var(--muted);
  margin: 0 0 0.4rem;
  line-height: 1.5;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.55rem;
}

.brow-meta-info {
  color: var(--muted);
}

.brow-meta-sep {
  color: var(--hair-strong);
  user-select: none;
}

.brow-rating-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.28rem;
  font-size: 0.8rem;
}

.brow-rating-score {
  font-weight: 600;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.brow-rating-stars {
  font-size: 0.72rem;
  color: var(--star-color);
  letter-spacing: 0.03em;
}

.brow-rating-count {
  font-size: 0.75rem;
  color: var(--faint);
}

.brow-desc {
  font-size: 0.86rem;
  color: var(--ink-secondary);
  margin: 0;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Empty Search State */
.search-empty {
  display: none;
  text-align: center;
  padding: 3.5rem 1rem;
  color: var(--muted);
}

.search-empty svg {
  width: 48px;
  height: 48px;
  stroke: var(--hair-strong);
  fill: none;
  margin: 0 auto 1rem;
}

.search-empty p {
  font-size: 0.95rem;
  margin: 0;
}

/* ==========================================================
   Detail Page Styles
   ========================================================== */

.back-nav {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 1.25rem 0 0.85rem;
  font-size: 0.88rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s ease;
}

.back-link:hover {
  color: var(--ink);
}

.breadcrumb-sep {
  color: var(--hair-strong);
  user-select: none;
  font-size: 0.82rem;
}

.breadcrumb-domain {
  color: var(--ink-secondary);
  font-size: 0.88rem;
  font-weight: 500;
}

.book-title-header {
  margin: 0.4rem 0 1.25rem;
}

.book-title-header h1 {
  font-size: 1.95rem;
  line-height: 1.35;
  margin: 0;
  color: var(--ink);
  letter-spacing: -0.015em;
}

/* Top metadata block (Douban card style) */
.detail-top {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  margin-bottom: 1.6rem;
}

.detail-cover-wrap {
  flex: 0 0 138px;
  width: 138px;
}

.detail-cover-wrap picture {
  display: block;
  width: 100%;
}

.detail-cover {
  width: 100%;
  height: auto;
  border-radius: 4px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.14), 0 1px 4px rgba(0, 0, 0, 0.08);
  border: 1px solid rgba(0, 0, 0, 0.06);
  aspect-ratio: 2 / 2.9;
  object-fit: cover;
  background: var(--soft);
}

.detail-meta {
  flex: 1 1 auto;
  font-size: 0.9rem;
  line-height: 1.9;
}

.detail-meta-item {
  display: flex;
  margin-bottom: 0.1rem;
}

.detail-meta-item .label {
  color: var(--muted);
  flex: 0 0 4.2rem;
}

.detail-meta-item .value {
  color: var(--ink);
}

.detail-meta-item a.douban-link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  color: var(--green);
  border-bottom: 1px solid var(--green-border);
  font-weight: 500;
  margin-top: 0.2rem;
}

.detail-meta-item a.douban-link:hover {
  border-color: var(--green);
}

/* Rating Box */
.ratebox {
  display: flex;
  align-items: center;
  gap: 1.15rem;
  background: var(--soft);
  border: 1px solid var(--hair);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.25rem;
  margin: 0 0 1.8rem;
}

.ratebox-num {
  font-size: 2.3rem;
  font-weight: 700;
  color: var(--green);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.ratebox-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.ratebox-stars {
  font-size: 0.88rem;
  color: var(--star-color);
  letter-spacing: 0.05em;
  margin-bottom: 0.2rem;
}

.ratebox-label {
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.4;
}

/* One sentence intro quote */
.intro-quote {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--ink);
  background: var(--green-subtle);
  border-left: 3px solid var(--green);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1rem 1.35rem;
  margin: 0 0 2.2rem;
  font-weight: 500;
}

/* Content Sections */
.section-block {
  margin: 0 0 2.6rem;
}

.section-block h2 {
  font-size: 1.28rem;
  font-weight: 600;
  margin: 0 0 1.15rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--hair-strong);
  color: var(--ink);
  letter-spacing: -0.01em;
}

/* Thesis */
.thesis-body p {
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--ink-secondary);
  margin-bottom: 0.9rem;
}

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

/* Core Ideas & Parts */
.idea-list, .part-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.idea-item, .part-item {
  padding: 1.25rem 0;
  border-top: 1px solid var(--hair);
}

.idea-item:first-child, .part-item:first-child {
  border-top: none;
  padding-top: 0.25rem;
}

.idea-item:last-child, .part-item:last-child {
  border-bottom: 1px solid var(--hair);
}

.idea-title, .part-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 0.45rem;
  line-height: 1.5;
}

.idea-desc, .part-desc {
  font-size: 0.95rem;
  color: var(--ink-secondary);
  margin: 0 0 0.65rem;
  line-height: 1.75;
}

/* Example Box */
.example-box {
  background: var(--soft);
  border: 1px solid var(--hair);
  border-left: 3px solid var(--green);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 0.75rem 1rem;
  margin-top: 0.5rem;
  font-size: 0.88rem;
  color: var(--ink-secondary);
  line-height: 1.65;
}

/* Prev / Next Navigation (Cover Cards) */
.pn {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
  border-top: 1px solid var(--hair);
  padding: 1.5rem 0 1rem;
  margin: 2.5rem 0 1rem;
}

.pn a {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  text-decoration: none;
  border: 1px solid var(--hair);
  border-radius: var(--radius-md);
  padding: 0.75rem 0.9rem;
  color: var(--ink);
  background: var(--paper);
  min-width: 0;
  transition: all 0.18s ease;
}

.pn a:hover {
  background: var(--soft);
  border-color: var(--hair-strong);
}

.pn a picture {
  flex: 0 0 44px;
  width: 44px;
  display: block;
}

.pn a img {
  width: 44px;
  height: auto;
  aspect-ratio: 2 / 2.9;
  object-fit: cover;
  border-radius: 3px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
  flex: 0 0 auto;
}

.pn a .t {
  font-family: var(--display);
  font-size: 0.88rem;
  font-weight: 700;
  line-height: 1.45;
  min-width: 0;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  letter-spacing: -0.01em;
}

.pn a .t span {
  display: block;
  font-family: var(--sans);
  font-size: 0.74rem;
  color: var(--green);
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.pn a.next {
  flex-direction: row-reverse;
  text-align: right;
}

.pn a.solo {
  grid-column: 1 / -1;
}

/* Bottom back to index button */
.nav-back-catalog {
  display: block;
  text-align: center;
  margin: 0.5rem auto 1.5rem;
  padding: 0.55rem 1.4rem;
  font-size: 0.88rem;
  color: var(--ink-secondary);
  background: var(--soft);
  border: 1px solid var(--hair);
  border-radius: var(--radius-pill);
  width: fit-content;
  transition: all 0.15s ease;
}

.nav-back-catalog:hover {
  color: var(--green);
  background: var(--green-subtle);
  border-color: var(--green-border);
}

/* Footer */
footer {
  border-top: 1px solid var(--hair);
  margin-top: 2.5rem;
  padding: 1.6rem 0 3.2rem;
}

footer p {
  font-size: 0.78rem;
  color: var(--muted);
  margin: 0 0 0.35rem;
  line-height: 1.6;
}

/* Responsive adjustments */
@media (min-width: 640px) {
  .hero h1 {
    font-size: 2.2rem;
  }
  
  .brow {
    padding: 1rem 0.8rem;
    margin: 0 -0.8rem;
  }
  
  .brow-cover-wrap {
    flex: 0 0 76px;
    width: 76px;
  }
  
  .brow-title {
    font-size: 1.15rem;
  }
  
  .detail-cover-wrap {
    flex: 0 0 168px;
    width: 168px;
  }
  
  .book-title-header h1 {
    font-size: 2.1rem;
  }
}

/* ==========================================================
   Mobile & Tablet Responsive System (< 640px)
   Impeccable craft for handheld touch screens
   ========================================================== */
@media (max-width: 640px) {
  /* Layout wrap */
  .wrap {
    padding: 0 1rem;
  }

  /* Header: eliminate awkward wraps */
  .sitehead {
    padding: 0.75rem 0;
  }

  .sitehead .brand {
    font-size: 1.12rem;
    gap: 0.4rem;
  }

  .sitehead .brand small {
    display: none; /* Hide long English brand subtitle on mobile to preserve 1-line layout */
  }

  .sitehead-tag {
    font-size: 0.7rem;
    padding: 0.12rem 0.48rem;
  }

  .sidebar-toggle-btn {
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
  }

  /* Hero */
  .hero {
    padding: 1.6rem 0 0.8rem;
  }

  .hero h1 {
    font-size: 1.55rem;
    gap: 0.4rem;
    margin-bottom: 0.4rem;
  }

  .hero h1 .hero-subtitle {
    display: block;
    width: 100%;
    font-size: 0.82rem;
    margin-top: 0.15rem;
  }

  .hero p {
    font-size: 0.88rem;
    line-height: 1.65;
    margin-bottom: 1rem;
  }

  /* Search input: 16px font-size to prevent iOS Safari auto-zoom */
  .search-box {
    margin-bottom: 1.2rem;
  }

  .search-input {
    font-size: 16px;
    min-height: 44px;
    padding: 0.6rem 2.2rem 0.6rem 2.3rem;
  }

  .search-icon {
    left: 0.8rem;
  }

  /* Sticky Domain Navigation Bar */
  .dnav-inner {
    padding: 0 1rem;
    gap: 1.35rem;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-x: contain;
  }

  .dnav a {
    font-size: 0.88rem;
    padding: 0.72rem 0.05rem;
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;
  }

  /* Domain header */
  .domain {
    padding: 2rem 0 0.5rem;
    scroll-margin-top: 54px;
  }

  .domain h2 {
    font-size: 1.25rem;
  }

  .domain .intro {
    font-size: 0.85rem;
    line-height: 1.6;
  }

  /* Book Rows on Mobile */
  .brow {
    padding: 0.95rem 0.25rem;
    margin: 0 -0.25rem;
    gap: 0.85rem;
    align-items: flex-start;
  }

  .brow-cover-wrap {
    flex: 0 0 58px;
    width: 58px;
  }

  .brow-cover-wrap img {
    border-radius: 3px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
  }

  .brow-title {
    font-size: 1rem;
    line-height: 1.4;
    margin-bottom: 0.2rem;
  }

  .brow-meta {
    font-size: 0.78rem;
    line-height: 1.5;
    margin-bottom: 0.3rem;
  }

  .brow-desc {
    font-size: 0.82rem;
    line-height: 1.55;
    -webkit-line-clamp: 2;
  }

  /* Detail Page */
  .back-nav {
    padding: 0.95rem 0 0.65rem;
    font-size: 0.82rem;
  }

  .back-link {
    font-size: 0.82rem;
  }

  .book-title-header {
    margin: 0.4rem 0 1rem;
  }

  .book-title-header h1 {
    font-size: 1.55rem;
    line-height: 1.3;
  }

  /* Detail Top: side-by-side compact mobile card */
  .detail-top {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    gap: 0.9rem;
    margin-bottom: 1.3rem;
  }

  .detail-cover-wrap {
    flex: 0 0 100px;
    width: 100px;
  }

  .detail-cover {
    border-radius: 4px;
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.12);
  }

  .detail-meta {
    font-size: 0.84rem;
    line-height: 1.7;
    width: auto;
  }

  .detail-meta-item {
    margin-bottom: 0.1rem;
  }

  .detail-meta-item .label {
    flex: 0 0 3.6rem;
    font-size: 0.8rem;
  }

  .detail-meta-item .value {
    font-size: 0.84rem;
    word-break: break-word;
  }

  .detail-meta-item a.douban-link {
    font-size: 0.8rem;
    margin-top: 0.25rem;
  }

  /* Ratebox */
  .ratebox {
    padding: 0.75rem 1rem;
    margin: 0 0 1.5rem;
    gap: 0.9rem;
  }

  .ratebox-num {
    font-size: 2rem;
  }

  .ratebox-stars {
    font-size: 0.82rem;
    margin-bottom: 0.1rem;
  }

  .ratebox-label {
    font-size: 0.76rem;
  }

  /* Intro quote */
  .intro-quote {
    font-size: 0.92rem;
    line-height: 1.7;
    padding: 0.85rem 1rem;
    margin: 0 0 1.6rem;
  }

  /* Content sections */
  .section-block {
    margin: 0 0 1.8rem;
  }

  .section-block h2 {
    font-size: 1.15rem;
    margin: 0 0 0.8rem;
    padding-bottom: 0.35rem;
  }

  .thesis-body p {
    font-size: 0.92rem;
    line-height: 1.8;
    margin-bottom: 0.75rem;
  }

  .idea-item, .part-item {
    padding: 0.85rem 0;
  }

  .idea-title, .part-title {
    font-size: 0.96rem;
    line-height: 1.45;
  }

  .idea-desc, .part-desc {
    font-size: 0.88rem;
    line-height: 1.68;
    margin-bottom: 0.4rem;
  }

  .example-box {
    font-size: 0.82rem;
    padding: 0.48rem 0.75rem;
    line-height: 1.55;
  }

  /* Prev / Next navigation: stacked 1 column on mobile for full title visibility */
  .pn {
    grid-template-columns: 1fr;
    gap: 0.65rem;
    padding: 1.2rem 0 0.8rem;
    margin: 1.8rem 0 0.8rem;
  }

  .pn a {
    padding: 0.65rem 0.85rem;
    min-height: 54px;
    gap: 0.7rem;
  }

  .pn a picture {
    flex: 0 0 38px;
    width: 38px;
  }

  .pn a img {
    width: 38px;
  }

  .pn a .t {
    font-size: 0.85rem;
    line-height: 1.4;
  }

  .pn a .t span {
    font-size: 0.72rem;
    margin-bottom: 0.12rem;
  }

  .nav-back-catalog {
    font-size: 0.84rem;
    padding: 0.6rem 1.4rem;
    min-height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  /* Floating drawer button */
  .floating-menu-btn {
    bottom: calc(16px + env(safe-area-inset-bottom, 0px));
    right: 16px;
    padding: 0.55rem 0.95rem;
    font-size: 0.82rem;
  }

  /* Sidebar drawer search input */
  #sidebarSearchInput {
    font-size: 16px; /* Stop iOS Safari auto-zoom */
  }

  .sidebar-link {
    min-height: 40px;
    padding: 0.52rem 1.15rem 0.52rem 1.05rem;
  }
}

/* Extra small mobile (< 380px, e.g. iPhone SE / mini) */
@media (max-width: 380px) {
  .wrap {
    padding: 0 0.85rem;
  }

  .brow {
    gap: 0.65rem;
  }

  .brow-cover-wrap {
    flex: 0 0 52px;
    width: 52px;
  }

  .detail-cover-wrap {
    flex: 0 0 90px;
    width: 90px;
  }

  .detail-meta-item .label {
    flex: 0 0 3.2rem;
  }

  .sitehead .brand {
    font-size: 1.05rem;
  }
}

/* ==========================================================
   Global Sidebar & Navigation Drawer System
   ========================================================== */

/* Layout container */
.layout-container {
  display: flex;
  min-height: 100vh;
}

.main-wrapper {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

/* Sidebar Backdrop (Mobile Drawer) */
.sidebar-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 15, 15, 0.45);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  z-index: 290;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

body.sidebar-open .sidebar-backdrop {
  opacity: 1;
  pointer-events: auto;
}

/* Global Sidebar */
.global-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 290px;
  max-width: 84vw;
  background: var(--paper);
  border-right: 1px solid var(--hair);
  z-index: 300;
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s ease;
  user-select: none;
  -webkit-user-select: none;
}

body.sidebar-open .global-sidebar {
  transform: translateX(0);
  box-shadow: 4px 0 24px rgba(0, 0, 0, 0.12);
}

/* Sidebar Header */
.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 1.15rem 0.9rem;
  border-bottom: 1px solid var(--hair);
  flex: 0 0 auto;
}

.sidebar-brand {
  text-decoration: none;
  color: var(--ink);
  display: flex;
  flex-direction: column;
}

.sidebar-brand-title {
  font-family: var(--display);
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.25;
  letter-spacing: -0.015em;
}

.sidebar-brand-sub {
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.05em;
  margin-top: 0.15rem;
}

.sidebar-close-btn {
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 1.5rem;
  line-height: 1;
  padding: 0.25rem 0.4rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}

.sidebar-close-btn:hover {
  color: var(--ink);
  background: var(--soft);
}

/* Sidebar Search */
.sidebar-search {
  padding: 0.75rem 1.15rem;
  border-bottom: 1px solid var(--hair);
  background: var(--soft);
  flex: 0 0 auto;
}

.sidebar-search-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.sb-search-icon {
  position: absolute;
  left: 0.65rem;
  width: 14px;
  height: 14px;
  stroke: var(--muted);
  stroke-width: 2;
  fill: none;
  pointer-events: none;
}

#sidebarSearchInput {
  width: 100%;
  padding: 0.42rem 1.8rem 0.42rem 2rem;
  font-size: 0.84rem;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--hair-strong);
  border-radius: var(--radius-pill);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

#sidebarSearchInput:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 2px rgba(0, 119, 34, 0.12);
}

.sb-search-clear {
  position: absolute;
  right: 0.5rem;
  display: none;
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 14px;
  cursor: pointer;
  padding: 0 0.2rem;
  line-height: 1;
}

.sidebar-search-empty {
  display: none;
  font-size: 0.78rem;
  color: var(--muted);
  text-align: center;
  padding-top: 0.45rem;
}

/* Sidebar Navigation List */
.sidebar-nav {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 0.6rem 0;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--hair) transparent;
}

.sidebar-nav::-webkit-scrollbar {
  width: 4px;
}

.sidebar-nav::-webkit-scrollbar-thumb {
  background: var(--hair);
  border-radius: 4px;
}

.sidebar-group {
  margin-bottom: 0.8rem;
}

.sidebar-group:last-child {
  margin-bottom: 0.3rem;
}

.sidebar-group-title {
  padding: 0.45rem 1.15rem 0.25rem;
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.06em;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-transform: uppercase;
}

.sidebar-badge {
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--faint);
  background: var(--soft);
  border: 1px solid var(--hair);
  padding: 0.05rem 0.4rem;
  border-radius: var(--radius-pill);
}

.sidebar-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.46rem 1.15rem 0.46rem 1.05rem;
  font-size: 0.86rem;
  color: var(--ink);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: background 0.12s ease, border-color 0.12s ease, color 0.12s ease;
  line-height: 1.4;
}

.sidebar-link:hover {
  background: var(--soft);
  color: var(--green);
}

.sidebar-link.active {
  background: var(--green-subtle);
  border-left-color: var(--green);
  color: var(--green);
  font-weight: 600;
}

.sb-num {
  font-size: 0.74rem;
  color: var(--faint);
  flex: 0 0 1.35rem;
  font-weight: 500;
}

.sidebar-link.active .sb-num {
  color: var(--green);
}

.sb-title {
  font-family: var(--sans);
  flex: 1 1 auto;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sb-score {
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--muted);
  flex: 0 0 auto;
}

.sidebar-link.active .sb-score {
  color: var(--green);
}

/* Sidebar Footer */
.sidebar-footer {
  flex: 0 0 auto;
  padding: 0.8rem 1.15rem;
  border-top: 1px solid var(--hair);
  background: var(--paper);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-catalog-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--ink-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.15s ease;
}

.sidebar-catalog-link:hover {
  color: var(--green);
}

.sidebar-kbd-hint {
  font-size: 0.68rem;
  color: var(--faint);
}

.sidebar-kbd-hint kbd {
  background: var(--soft);
  border: 1px solid var(--hair-strong);
  border-radius: 3px;
  padding: 0.1rem 0.3rem;
  font-family: var(--mono);
}

/* Header with Sidebar Toggle */
.sitehead-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.sidebar-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: var(--soft);
  border: 1px solid var(--hair-strong);
  border-radius: var(--radius-sm);
  padding: 0.3rem 0.65rem;
  font-size: 0.82rem;
  font-family: var(--sans);
  color: var(--ink);
  cursor: pointer;
  transition: all 0.15s ease;
}

.sidebar-toggle-btn:hover {
  background: var(--paper);
  border-color: var(--green);
  color: var(--green);
}

.sidebar-toggle-btn svg {
  stroke: currentColor;
}

.sidebar-toggle-btn .kbd-pill {
  margin-left: 0.15rem;
}

.sidebar-toggle-btn .kbd-pill kbd {
  background: var(--paper);
  border: 1px solid var(--hair-strong);
  border-radius: 3px;
  padding: 0.05rem 0.3rem;
  font-size: 0.68rem;
  font-family: var(--mono);
  color: var(--muted);
}

/* Floating Drawer Pill on Touch/Mobile Screens */
.floating-menu-btn {
  position: fixed;
  bottom: calc(20px + env(safe-area-inset-bottom, 0px));
  right: 18px;
  z-index: 180;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.6rem 1.05rem;
  border-radius: var(--radius-pill);
  background: rgba(22, 22, 22, 0.92);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.22), 0 1px 4px rgba(0, 0, 0, 0.12);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  font-size: 0.84rem;
  font-weight: 500;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease;
}

.floating-menu-btn:hover {
  background: #000000;
  transform: translateY(-2px);
}

.floating-menu-btn:active {
  transform: scale(0.96);
}

.floating-menu-btn svg {
  stroke: currentColor;
}

/* Responsive Rules: Default Hidden for Immersive Reading Across All Devices */
@media (min-width: 1024px) {
  .global-sidebar {
    width: 320px;
  }

  .floating-menu-btn {
    display: none;
  }
}

@media (max-width: 1023px) {
  .sidebar-kbd-hint,
  .sidebar-toggle-btn .kbd-pill {
    display: none;
  }
}

/* ==========================================================
   Cmd+K 全局搜索与用户书架状态 (Cmd+K Global Search & Shelf)
   ========================================================== */

/* 1. Header Cmd+K Trigger Button */
.sitehead-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.cmdk-trigger-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--hair-strong);
  background: var(--soft);
  color: var(--ink-secondary);
  font-size: 0.82rem;
  font-family: var(--sans);
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.cmdk-trigger-btn:hover {
  background: var(--paper);
  border-color: var(--green);
  color: var(--green);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.cmdk-trigger-kbd kbd {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--muted);
  background: var(--paper);
  border: 1px solid var(--hair-strong);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  line-height: 1;
}

/* 2. Toast Notification */
.status-toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  opacity: 0;
  pointer-events: none;
  background: rgba(22, 28, 24, 0.94);
  color: #ffffff;
  padding: 0.55rem 1.15rem;
  border-radius: var(--radius-pill);
  font-size: 0.86rem;
  font-weight: 500;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.22);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 9999;
  transition: opacity 0.2s cubic-bezier(0.16, 1, 0.3, 1), transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.status-toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

/* 3. Detail Page Shelf Action Bar */
.detail-user-shelf {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin: 1.1rem 0 1.25rem;
  padding: 0.85rem 1.1rem;
  background: var(--soft);
  border: 1px solid var(--hair);
  border-radius: var(--radius-md);
}

.shelf-action-group {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.detail-shelf-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 1.05rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--hair-strong);
  background: var(--paper);
  color: var(--ink-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.18s ease;
}

.detail-shelf-btn:hover {
  border-color: var(--muted);
  color: var(--ink);
}

.detail-shelf-btn.btn-want.active {
  background: #fffbeb;
  border-color: #f59e0b;
  color: #b45309;
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(245, 158, 11, 0.18);
}

.detail-shelf-btn.btn-read.active {
  background: #f0fdf4;
  border-color: #22c55e;
  color: #15803d;
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(34, 197, 94, 0.18);
}

.detail-shelf-btn svg {
  stroke: currentColor;
}

.shelf-status-badge {
  font-size: 0.82rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.shelf-status-badge.badge-want {
  color: #b45309;
  font-weight: 600;
}

.shelf-status-badge.badge-read {
  color: #15803d;
  font-weight: 600;
}

/* 4. Index Page Shelf Filter Bar */
.shelf-filter-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.85rem;
  flex-wrap: wrap;
}

.shelf-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--hair-strong);
  background: var(--paper);
  color: var(--muted);
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.shelf-pill:hover {
  border-color: var(--muted);
  color: var(--ink);
}

.shelf-pill.active {
  background: var(--ink);
  border-color: var(--ink);
  color: #ffffff;
  font-weight: 500;
}

.shelf-pill.pill-want.active {
  background: #b45309;
  border-color: #b45309;
  color: #ffffff;
}

.shelf-pill.pill-read.active {
  background: var(--green);
  border-color: var(--green);
  color: #ffffff;
}

.shelf-count {
  font-size: 0.76rem;
  opacity: 0.85;
}

.empty-action-btn {
  margin-top: 0.85rem;
  display: inline-block;
  padding: 0.45rem 1rem;
  border-radius: var(--radius-pill);
  background: var(--green);
  color: #ffffff;
  border: none;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.15s ease;
}

.empty-action-btn:hover {
  background: var(--green-hover);
}

/* 5. Index Card User Status Badge & Quick Actions */
.brow-title-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.brow-user-tag {
  display: none;
  font-size: 0.7rem;
  line-height: 1.2;
  padding: 0.12rem 0.42rem;
  border-radius: 3px;
  font-weight: 600;
}

.brow-user-tag.tag-want {
  display: inline-block;
  background: #fffbeb;
  color: #b45309;
  border: 1px solid #fde68a;
}

.brow-user-tag.tag-read {
  display: inline-block;
  background: #f0fdf4;
  color: #15803d;
  border: 1px solid #bbf7d0;
}

.brow-actions {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  align-self: center;
  margin-left: 0.75rem;
  flex-shrink: 0;
}

.brow-act-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  padding: 0.25rem 0.55rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--hair-strong);
  background: var(--paper);
  color: var(--muted);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.brow-act-btn:hover {
  border-color: var(--muted);
  color: var(--ink);
}

.brow-act-btn.brow-act-want.active {
  background: #fffbeb;
  border-color: #f59e0b;
  color: #b45309;
  font-weight: 600;
}

.brow-act-btn.brow-act-read.active {
  background: #f0fdf4;
  border-color: #22c55e;
  color: #15803d;
  font-weight: 600;
}

/* 6. Cmd+K Modal Dialog */
body.cmdk-modal-open {
  overflow: hidden;
}

.cmdk-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(18, 24, 20, 0.48);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 3.5rem 1rem 2rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.cmdk-backdrop.is-open {
  opacity: 1;
  pointer-events: auto;
}

.cmdk-dialog {
  background: var(--paper);
  border: 1px solid var(--hair-strong);
  border-radius: 14px;
  width: 100%;
  max-width: 640px;
  max-height: calc(85vh - 2rem);
  display: flex;
  flex-direction: column;
  box-shadow: 0 24px 56px -12px rgba(0, 0, 0, 0.25), 0 2px 6px rgba(0, 0, 0, 0.08);
  transform: translateY(-10px) scale(0.98);
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  overflow: hidden;
}

.cmdk-backdrop.is-open .cmdk-dialog {
  transform: translateY(0) scale(1);
}

.cmdk-head {
  padding: 0.85rem 1.1rem;
  border-bottom: 1px solid var(--hair);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.cmdk-input-wrap {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex: 1;
  min-width: 0;
}

.cmdk-icon {
  stroke: var(--muted);
  flex-shrink: 0;
}

.cmdk-input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 1.02rem;
  color: var(--ink);
  background: transparent;
  font-family: var(--sans);
  min-width: 0;
}

.cmdk-input::placeholder {
  color: var(--faint);
  font-size: 0.92rem;
}

.cmdk-input-clear {
  display: none;
  border: none;
  background: var(--soft);
  color: var(--muted);
  width: 20px;
  height: 20px;
  border-radius: 50%;
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.cmdk-close-btn {
  border: 1px solid var(--hair-strong);
  background: var(--soft);
  color: var(--muted);
  font-size: 0.72rem;
  font-family: var(--mono);
  padding: 0.2rem 0.45rem;
  border-radius: 4px;
  cursor: pointer;
}

.cmdk-close-btn:hover {
  background: var(--soft-hover);
  color: var(--ink);
}

.cmdk-pills-bar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 1.1rem;
  border-bottom: 1px solid var(--hair);
  background: var(--soft);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.cmdk-pills-bar::-webkit-scrollbar {
  display: none;
}

.cmdk-pill {
  font-size: 0.78rem;
  padding: 0.24rem 0.65rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--hair);
  background: var(--paper);
  color: var(--muted);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
}

.cmdk-pill:hover {
  border-color: var(--muted);
  color: var(--ink);
}

.cmdk-pill.active {
  background: var(--ink);
  border-color: var(--ink);
  color: #ffffff;
  font-weight: 500;
}

.cmdk-pill.pill-want.active {
  background: #b45309;
  border-color: #b45309;
  color: #ffffff;
}

.cmdk-pill.pill-read.active {
  background: var(--green);
  border-color: var(--green);
  color: #ffffff;
}

.cmdk-pill-sep {
  width: 1px;
  height: 14px;
  background: var(--hair-strong);
  margin: 0 0.2rem;
  flex-shrink: 0;
}

.cmdk-body {
  flex: 1;
  overflow-y: auto;
  overscroll-behavior: contain;
  min-height: 240px;
}

.cmdk-results {
  list-style: none;
  margin: 0;
  padding: 0.4rem 0;
}

.cmdk-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.7rem 1.1rem;
  gap: 0.85rem;
  cursor: pointer;
  border-bottom: 1px solid rgba(0, 0, 0, 0.03);
  transition: background 0.12s ease;
}

.cmdk-item:hover,
.cmdk-item.is-selected {
  background: var(--green-subtle);
}

.cmdk-item-link {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex: 1;
  min-width: 0;
  text-decoration: none;
  color: inherit;
}

.cmdk-item-cover {
  width: 40px;
  height: 56px;
  flex-shrink: 0;
  border-radius: 3px;
  overflow: hidden;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
  background: var(--soft);
}

.cmdk-item-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cmdk-item-info {
  flex: 1;
  min-width: 0;
}

.cmdk-item-title-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.2rem;
  flex-wrap: wrap;
}

.cmdk-item-title {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--ink);
  line-height: 1.3;
}

.cmdk-item-domain {
  font-size: 0.7rem;
  color: var(--green);
  background: var(--green-subtle);
  border: 1px solid var(--green-border);
  padding: 0.05rem 0.35rem;
  border-radius: 3px;
  line-height: 1.2;
}

.cmdk-item-tag {
  font-size: 0.68rem;
  padding: 0.05rem 0.35rem;
  border-radius: 3px;
  font-weight: 600;
  line-height: 1.2;
}

.cmdk-item-tag.tag-want {
  background: #fffbeb;
  color: #b45309;
  border: 1px solid #fde68a;
}

.cmdk-item-tag.tag-read {
  background: #f0fdf4;
  color: #15803d;
  border: 1px solid #bbf7d0;
}

.cmdk-item-meta {
  font-size: 0.78rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 0.2rem;
}

.cmdk-item-rating {
  color: var(--star-color);
  font-weight: 600;
}

.cmdk-item-intro {
  font-size: 0.76rem;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.4;
}

mark.cmdk-highlight {
  background: rgba(0, 119, 34, 0.18);
  color: var(--green-hover);
  font-weight: 700;
  padding: 0 0.15em;
  border-radius: 2px;
}

.cmdk-item-actions {
  display: flex;
  gap: 0.35rem;
  align-items: center;
  flex-shrink: 0;
}

.cmdk-act-btn {
  font-size: 0.74rem;
  padding: 0.25rem 0.55rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--hair-strong);
  background: var(--paper);
  color: var(--muted);
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.cmdk-act-btn:hover {
  border-color: var(--muted);
  color: var(--ink);
}

.cmdk-act-btn.cmdk-act-want.active {
  background: #fffbeb;
  border-color: #f59e0b;
  color: #b45309;
  font-weight: 600;
}

.cmdk-act-btn.cmdk-act-read.active {
  background: #f0fdf4;
  border-color: #22c55e;
  color: #15803d;
  font-weight: 600;
}

.cmdk-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1.5rem;
  color: var(--muted);
  text-align: center;
}

.cmdk-empty svg {
  stroke: var(--hair-strong);
  margin-bottom: 0.75rem;
}

.cmdk-empty-text {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--ink-secondary);
  margin-bottom: 0.25rem;
}

.cmdk-empty-sub {
  font-size: 0.8rem;
  color: var(--faint);
  margin: 0;
}

.cmdk-foot {
  padding: 0.55rem 1.1rem;
  border-top: 1px solid var(--hair);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--muted);
  background: var(--soft);
}

.cmdk-foot-hints {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.cmdk-hint kbd {
  font-family: var(--mono);
  font-size: 0.7rem;
  background: var(--paper);
  border: 1px solid var(--hair-strong);
  padding: 0.08rem 0.32rem;
  border-radius: 3px;
  margin-right: 0.2rem;
}

/* Mobile responsive adjustments */
@media (max-width: 640px) {
  .cmdk-backdrop {
    padding: 1.5rem 0.5rem 1rem;
  }
  .cmdk-dialog {
    max-height: 90vh;
    border-radius: 10px;
  }
  .cmdk-trigger-text {
    display: none;
  }
  .cmdk-trigger-btn {
    padding: 0.35rem 0.55rem;
  }
  .brow-actions {
    margin-left: 0.4rem;
  }
  .brow-act-btn span {
    display: none;
  }
  .cmdk-item-intro {
    display: none;
  }
  .cmdk-foot-hints {
    display: none;
  }
}

/* ==========================================================
   思维导图组件样式 (Tree Mindmap Canvas & Outline Styles)
   ========================================================== */

.mindmap-section {
  margin-top: 2.2rem;
  padding: 1.25rem 1.4rem;
  background: var(--paper);
  border: 1px solid var(--hair);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
}

.mindmap-section.is-fullscreen {
  position: fixed !important;
  inset: 0 !important;
  z-index: 99999 !important;
  width: 100vw !important;
  height: 100vh !important;
  margin: 0 !important;
  border-radius: 0 !important;
  border: none !important;
  background: #fbfbf9 !important;
  display: flex !important;
  flex-direction: column !important;
  padding: 0.9rem 1.4rem !important;
  box-shadow: none !important;
}

.mindmap-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--hair);
}

.mindmap-header-left {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.mindmap-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.18rem 0.55rem;
  background: var(--green-subtle);
  color: var(--green);
  border: 1px solid var(--green-border);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.mindmap-title {
  margin: 0;
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.mindmap-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* Control Button Groups */
.mm-view-switch,
.mm-level-switch,
.mm-zoom-controls {
  display: inline-flex;
  align-items: center;
  background: var(--soft);
  border: 1px solid var(--hair-strong);
  border-radius: var(--radius-sm);
  padding: 2px;
  gap: 1px;
}

.mm-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.28rem 0.55rem;
  background: transparent;
  border: none;
  border-radius: 3px;
  color: var(--ink-secondary);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
  line-height: 1.2;
}

.mm-btn:hover {
  background: var(--paper);
  color: var(--green);
}

.mm-btn.active {
  background: var(--paper);
  color: var(--green);
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.mm-btn-icon {
  padding: 0.28rem 0.45rem;
}

.mm-btn-standalone {
  background: var(--paper);
  border: 1px solid var(--hair-strong);
  border-radius: var(--radius-sm);
  padding: 0.32rem 0.65rem;
}

.mm-btn-standalone:hover {
  border-color: var(--green);
  color: var(--green);
  background: var(--green-subtle);
}

.mm-btn-standalone:active {
  transform: scale(0.97);
}

/* Viewport Wrapper */
.mm-viewport-wrapper {
  margin-top: 0.9rem;
  position: relative;
  flex: 1;
  display: flex;
  flex-direction: column;
}

/* Interactive Markmap Canvas Viewport */
.mm-viewport {
  width: 100%;
  height: 560px;
  min-height: 480px;
  background-color: #fdfdfc;
  background-image: radial-gradient(#d6d3cb 1px, transparent 1px);
  background-size: 20px 20px;
  border: 1px solid var(--hair);
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.02);
}

.mindmap-section.is-fullscreen .mm-viewport {
  height: 100% !important;
  flex: 1;
  border-radius: var(--radius-sm);
}

#markmapSvg {
  width: 100%;
  height: 100%;
  display: block;
  user-select: none;
}

/* Markmap Toolbar Styling */
.mm-toolbar-wrap {
  position: absolute;
  bottom: 12px;
  right: 12px;
  z-index: 10;
}

.mm-toolbar {
  display: flex;
  user-select: none;
  align-items: center;
  border: 1px solid var(--hair-strong);
  border-radius: var(--radius-sm);
  background-color: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  padding: 0.25rem;
  line-height: 1;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.mm-toolbar svg {
  display: block;
}

.mm-toolbar-item {
  margin-left: 0.25rem;
}

.mm-toolbar-item:first-child {
  margin-left: 0;
}

.mm-toolbar-item > * {
  min-width: 1.25rem;
  height: 1.25rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 0.75rem;
  color: var(--muted);
  border-radius: 3px;
  transition: all 0.15s ease;
}

.mm-toolbar-item:hover > * {
  background-color: var(--soft-hover);
  color: var(--green);
}

.mm-toolbar-item.active > * {
  background-color: var(--green-subtle);
  color: var(--green);
}

/* Markmap SVG Node & Link Polish */
.markmap-node text {
  font-family: var(--sans);
  fill: var(--ink);
}

.markmap-node foreignObject {
  overflow: visible;
}

.markmap-node foreignObject div {
  font-family: var(--sans);
  color: var(--ink);
  font-size: 14px;
  line-height: 1.45;
}

.markmap-node circle {
  cursor: pointer;
  transition: r 0.15s ease, stroke-width 0.15s ease;
}

.markmap-node circle:hover {
  r: 6px;
  stroke-width: 2.5px;
}

/* Canvas Hint */
.mm-canvas-hint {
  position: absolute;
  bottom: 0.75rem;
  left: 0.75rem;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border: 1px solid var(--hair);
  border-radius: 4px;
  padding: 0.25rem 0.65rem;
  font-size: 0.74rem;
  color: var(--muted);
  pointer-events: none;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
}

/* Toast Message */
.mm-toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: rgba(26, 26, 26, 0.92);
  color: #ffffff;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 500;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
  pointer-events: none;
  opacity: 0;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 100000;
}

.mm-toast.active {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Responsive */
@media (max-width: 640px) {
  .mindmap-section {
    padding: 0.9rem 0.75rem;
  }
  .mindmap-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .mindmap-actions {
    width: 100%;
    justify-content: flex-start;
  }
  .mm-viewport {
    height: 440px;
    min-height: 380px;
  }
}