/* ===== CSS Variables ===== */
:root {
  --color-bg: #f5f0e8;
  --color-sidebar: #1a1a2e;
  --color-sidebar-text: #e0d5c1;
  --color-accent: #c9a84c;
  --color-accent2: #8b5cf6;
  --color-heading: #2d1b4e;
  --color-text: #333333;
  --color-red: #dc2626;
  --color-green: #16a34a;
  --color-orange: #ea580c;
  --color-border: #d4c5a9;
  --color-card: #ffffff;
  --sidebar-width: 280px;
  --topbar-height: 4px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'Noto Serif SC', serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.8;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

/* ===== Reading Progress Bar ===== */
#progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: var(--topbar-height);
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent2));
  z-index: 10001;
  transition: width 0.1s linear;
}

/* ===== Hamburger Button ===== */
#hamburger-btn {
  display: none;
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 10002;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 10px;
  background: var(--color-sidebar);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.3);
  transition: background 0.2s;
}
#hamburger-btn:hover { background: #252545; }
#hamburger-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
  transition: all 0.3s;
}
#hamburger-btn.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
#hamburger-btn.active span:nth-child(2) { opacity: 0; }
#hamburger-btn.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ===== Overlay ===== */
#overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 10000;
  opacity: 0;
  transition: opacity 0.3s;
}
#overlay.active { display: block; opacity: 1; }

/* ===== Sidebar ===== */
#sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--color-sidebar);
  color: var(--color-sidebar-text);
  z-index: 10000;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

#sidebar-header {
  padding: 24px 20px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  flex-shrink: 0;
}

#sidebar-header h1 {
  font-family: 'Noto Sans SC', sans-serif;
  font-size: 22px;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 2px;
  margin-bottom: 4px;
}

#sidebar-header p {
  font-size: 12px;
  color: rgba(224, 213, 193, 0.5);
  letter-spacing: 1px;
}

#sidebar-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
  scrollbar-width: thin;
  scrollbar-color: rgba(201, 168, 76, 0.3) transparent;
}
#sidebar-scroll::-webkit-scrollbar { width: 4px; }
#sidebar-scroll::-webkit-scrollbar-track { background: transparent; }
#sidebar-scroll::-webkit-scrollbar-thumb { background: rgba(201, 168, 76, 0.3); border-radius: 4px; }

/* TOC Items */
.toc-section {
  margin-bottom: 4px;
}

.toc-link {
  display: block;
  padding: 6px 20px;
  color: var(--color-sidebar-text);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.5;
  transition: all 0.15s;
  border-left: 3px solid transparent;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.toc-link:hover {
  background: rgba(255,255,255,0.06);
  color: #fff;
}

.toc-link.toc-h2 {
  font-family: 'Noto Sans SC', sans-serif;
  font-weight: 600;
  font-size: 14px;
  padding: 10px 16px 8px;
  color: var(--color-accent);
  border-left: 3px solid var(--color-accent);
  letter-spacing: 1px;
}

.toc-link.toc-h3 {
  font-family: 'Noto Sans SC', sans-serif;
  font-weight: 500;
  font-size: 13px;
  padding: 5px 20px 5px 28px;
  color: rgba(224, 213, 193, 0.85);
}

.toc-link.toc-h4 {
  font-size: 12.5px;
  padding: 3px 20px 3px 40px;
  color: rgba(224, 213, 193, 0.6);
}

.toc-link.toc-h4:hover {
  color: rgba(224, 213, 193, 0.9);
}

.toc-link.active {
  color: #fff !important;
  background: rgba(201, 168, 76, 0.12);
}
.toc-link.toc-h2.active {
  border-left-color: var(--color-accent);
  background: rgba(201, 168, 76, 0.15);
}

.toc-icon {
  font-size: 10px;
  margin-right: 4px;
  opacity: 0.7;
}

/* ===== Navigation Buttons ===== */
#nav-buttons {
  padding: 12px 16px;
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.nav-btn {
  flex: 1;
  padding: 8px 0;
  border: 1px solid rgba(201, 168, 76, 0.3);
  background: transparent;
  color: var(--color-accent);
  font-family: 'Noto Sans SC', sans-serif;
  font-size: 12px;
  font-weight: 500;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 1px;
}
.nav-btn:hover {
  background: rgba(201, 168, 76, 0.15);
  border-color: var(--color-accent);
}

/* ===== Main Content ===== */
#main-content {
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  padding: 0;
  position: relative;
}

.content-wrapper {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 48px 80px;
  position: relative;
  z-index: 1;
}

/* ===== Content Typography ===== */
#main-content h2 {
  font-family: 'Noto Sans SC', sans-serif;
  font-size: 28px;
  font-weight: 700;
  color: var(--color-heading);
  margin: 56px 0 24px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--color-accent);
  position: relative;
  scroll-margin-top: 80px;
}

#main-content h2::before {
  content: '\25C7';
  position: absolute;
  left: -20px;
  color: var(--color-accent);
  font-size: 18px;
  top: 2px;
}

#main-content h3 {
  font-family: 'Noto Sans SC', sans-serif;
  font-size: 20px;
  font-weight: 600;
  color: var(--color-heading);
  margin: 40px 0 16px;
  padding-left: 14px;
  border-left: 4px solid var(--color-accent2);
  scroll-margin-top: 80px;
}

#main-content h4 {
  font-family: 'Noto Sans SC', sans-serif;
  font-size: 17px;
  font-weight: 600;
  color: var(--color-heading);
  margin: 32px 0 12px;
  padding: 10px 16px;
  background: var(--color-card);
  border-radius: 8px;
  border: 1px solid var(--color-border);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
  scroll-margin-top: 80px;
}

#main-content h4 .mw-headline {
  display: inline;
}

#main-content p {
  margin: 8px 0;
  line-height: 1.9;
  text-align: justify;
}

#main-content ul {
  margin: 8px 0 8px 24px;
  padding: 0;
}

#main-content ul li {
  margin: 4px 0;
  line-height: 1.8;
}

#main-content b, #main-content strong {
  color: var(--color-heading);
  font-weight: 600;
}

#main-content i {
  color: #666;
  font-style: italic;
}

#main-content s {
  color: #999;
}

#main-content a {
  color: var(--color-accent2);
  text-decoration: none;
  border-bottom: 1px dashed var(--color-accent2);
  transition: color 0.2s;
}
#main-content a:hover {
  color: var(--color-heading);
}

/* ===== Info Card (dl blocks) ===== */
#main-content dl {
  margin: 12px 0 16px;
  padding: 16px 20px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: 8px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}

#main-content dl dd {
  margin: 4px 0;
  padding: 4px 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
}

#main-content dl dd:first-child {
  font-weight: 500;
  color: var(--color-heading);
}

/* ===== Tip / Note Boxes ===== */
.tip-box {
  margin: 16px 0;
  padding: 14px 20px;
  background: #f0f4ff;
  border: 1px solid #c7d2fe;
  border-left: 5px solid #6366f1;
  border-radius: 8px;
  font-size: 14px;
  line-height: 1.7;
  max-width: 100%;
  text-align: left !important;
}

/* ===== Color Helpers ===== */
font[color="red"], .text-red {
  color: var(--color-red) !important;
  font-weight: 500;
}
font[color="green"], .text-green {
  color: var(--color-green) !important;
  font-weight: 500;
}
font[color="orange"], .text-orange {
  color: var(--color-orange) !important;
  font-weight: 500;
}
font[color="blue"], .text-blue {
  color: #2563eb !important;
  font-weight: 500;
}
font[color="#FFF281"] {
  color: #b8960f !important;
  font-weight: 500;
}

/* ===== Item Link Styling ===== */
#main-content a.new {
  color: #c45c5c;
  border-bottom-color: #c45c5c;
}

/* ===== Inline Item Images (30x30 px PNG) ===== */
#main-content img.item-icon {
  display: inline-block;
  vertical-align: middle;
  width: 30px;
  height: 30px;
  object-fit: contain;
  margin: 0 2px;
  border-radius: 4px;
  image-rendering: pixelated;
  transition: transform 0.15s ease;
}

#main-content img.item-icon:hover {
  transform: scale(1.8);
  z-index: 10;
  position: relative;
  box-shadow: 0 2px 12px rgba(0,0,0,0.3);
}

/* ===== Scroll-to-top button ===== */
#scroll-top-btn {
  display: none;
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-sidebar);
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
  font-size: 18px;
  cursor: pointer;
  z-index: 9999;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
  transition: all 0.2s;
  font-family: 'Noto Sans SC', sans-serif;
  line-height: 1;
}
#scroll-top-btn:hover {
  background: var(--color-accent);
  color: var(--color-sidebar);
}
#scroll-top-btn.visible {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ===== Decorative Background ===== */
#main-content::before {
  content: '';
  position: fixed;
  top: 0;
  left: var(--sidebar-width);
  right: 0;
  height: 200px;
  background: linear-gradient(180deg, rgba(45, 27, 78, 0.03) 0%, transparent 100%);
  pointer-events: none;
  z-index: 0;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  #sidebar {
    transform: translateX(-100%);
  }
  #sidebar.open {
    transform: translateX(0);
  }
  #main-content {
    margin-left: 0;
  }
  #main-content::before {
    left: 0;
  }
  #hamburger-btn {
    display: flex;
  }
  .content-wrapper {
    padding: 32px 24px 80px;
  }
  #main-content h2::before {
    left: -16px;
  }
}

@media (max-width: 768px) {
  body { font-size: 14px; }
  .content-wrapper {
    padding: 24px 16px 80px;
  }
  #main-content h2 {
    font-size: 22px;
    margin: 40px 0 16px;
  }
  #main-content h2::before {
    left: -14px;
    font-size: 14px;
  }
  #main-content h3 {
    font-size: 17px;
    margin: 28px 0 12px;
  }
  #main-content h4 {
    font-size: 15px;
    padding: 8px 12px;
    margin: 24px 0 10px;
  }
  #main-content dl {
    padding: 12px 14px;
  }
  .tip-box {
    padding: 10px 14px;
    font-size: 13px;
  }
  #main-content img.item-icon {
    width: 26px;
    height: 26px;
  }
}

@media (max-width: 480px) {
  body { font-size: 13px; }
  .content-wrapper {
    padding: 20px 12px 80px;
  }
  #main-content h2 {
    font-size: 20px;
    margin: 32px 0 12px;
    padding-bottom: 10px;
  }
  #main-content h3 {
    font-size: 16px;
    margin: 24px 0 10px;
  }
  #main-content h4 {
    font-size: 14px;
    padding: 8px 10px;
    margin: 20px 0 8px;
  }
  #main-content h2::before {
    left: -12px;
    font-size: 12px;
  }
  #main-content dl {
    padding: 10px 12px;
    margin: 8px 0 12px;
  }
  #main-content dl dd {
    font-size: 13px;
  }
  #main-content img.item-icon {
    width: 24px;
    height: 24px;
  }
}

/* ===== Print ===== */
@media print {
  #sidebar, #hamburger-btn, #overlay, #progress-bar, #scroll-top-btn, #nav-buttons { display: none !important; }
  #main-content { margin-left: 0 !important; }
  #main-content::before { display: none !important; }
  .content-wrapper { padding: 20px !important; }
  body { font-size: 12px; }
}