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

/* === BASE === */
:root {
  --bg: #0b0f19;
  --bg-card: #121929;
  --bg-sidebar: #060a14;
  --bg-code: #0f1525;
  --border: #2a3045;
  --text: #e8dcc8;
  --text-muted: #9a8e7a;
  --accent: #d4a017;
  --accent-hover: #f0c040;
  --accent-bg: rgba(212, 160, 23, 0.10);
  --green: #50c878;
  --orange: #e67e22;
  --red: #e74c3c;
  --purple: #a78bfa;
  --teal: #2dd4bf;
  --table-header: #151d30;
  --table-row-alt: #121929;
}

html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  display: flex;
  min-height: 100vh;
}

/* === SIDEBAR === */
.sidebar {
  width: 280px;
  min-width: 280px;
  background: var(--bg-sidebar);
  border-right: 1px solid rgba(212, 160, 23, 0.15);
  padding: 24px 0;
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  overflow-y: auto;
  z-index: 100;
  transition: transform 0.3s ease;
}
.sidebar-header {
  padding: 0 20px 20px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}
.sidebar-header h1 {
  font-size: 18px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.3px;
  text-shadow: 0 0 12px rgba(212, 160, 23, 0.4);
}
.sidebar-header p {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
}
.nav-section {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  padding: 16px 20px 6px;
}
.sidebar a {
  display: block;
  padding: 8px 20px 8px 28px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  border-left: 3px solid transparent;
  transition: all 0.15s ease;
}
.sidebar a.sub {
  padding-left: 42px;
  font-size: 13px;
  color: #9a8e7a;
}
.sidebar a:hover {
  color: var(--text);
  background: var(--accent-bg);
}
.sidebar a.active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-bg);
  font-weight: 600;
}
.sidebar a.active.sub {
  font-weight: 600;
  color: var(--accent);
}

/* === MOBILE TOGGLE === */
.menu-toggle {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 18px;
}
.overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5);
  z-index: 90;
}

/* === MAIN CONTENT === */
.main {
  margin-left: 280px;
  flex: 1;
  min-width: 0;
}
.content {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 48px 80px;
}

/* === TYPOGRAPHY === */
.content h1 {
  font-size: 32px;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 8px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent);
  letter-spacing: -0.5px;
}
.content h2 {
  font-size: 24px;
  font-weight: 600;
  color: var(--text);
  margin: 48px 0 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(212, 160, 23, 0.3);
}
.content h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--accent);
  margin: 40px 0 14px;
  padding-top: 16px;
  border-top: 1px solid rgba(42, 48, 69, 0.5);
}
.content h4 {
  font-size: 17px;
  font-weight: 700;
  color: #2dd4bf;
  margin: 28px 0 10px;
  letter-spacing: 0.2px;
}
.content p {
  margin: 0 0 18px;
  color: var(--text);
}
.content strong {
  color: var(--text);
  font-weight: 600;
}
.content em {
  color: var(--text-muted);
}
.content a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(212, 160, 23, 0.3);
  transition: border-color 0.15s ease;
}
.content a:hover {
  border-bottom-color: var(--accent);
}

/* === LISTS === */
.content ul, .content ol {
  margin: 0 0 16px 24px;
}
.content li {
  margin-bottom: 10px;
}
.content ol > li {
  margin-bottom: 12px;
}
.content li > ul, .content li > ol {
  margin-top: 6px;
  margin-bottom: 0;
}

/* === CODE === */
.content code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 13px;
  background: rgba(15, 21, 37, 0.8);
  padding: 2px 7px;
  border-radius: 4px;
  border: 1px solid rgba(212, 160, 23, 0.15);
  color: #f0c040;
}
.content pre {
  background: #0a0e1a;
  border: 1px solid rgba(212, 160, 23, 0.12);
  border-radius: 8px;
  padding: 18px 24px;
  overflow-x: auto;
  margin: 24px 0;
  line-height: 1.5;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.3);
}
.content pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 13px;
}

/* === TABLES === */
.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 24px;
  font-size: 14px;
  border: 1px solid rgba(212, 160, 23, 0.15);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}
.content thead {
  background: var(--table-header);
}
.content th {
  text-align: left;
  padding: 10px 14px;
  font-weight: 600;
  color: var(--text);
  border-bottom: 2px solid var(--border);
  font-size: 13px;
}
.content td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.content tbody tr:nth-child(odd) {
  background: rgba(11, 15, 25, 0.6);
}
.content tbody tr:nth-child(even) {
  background: rgba(21, 29, 48, 0.6);
}
.content tbody tr:hover {
  background: var(--accent-bg);
}

/* === BLOCKQUOTE (default) === */
.content blockquote {
  border-left: 3px solid var(--accent);
  padding: 14px 24px;
  margin: 20px 0;
  background: var(--accent-bg);
  border-radius: 0 6px 6px 0;
  color: var(--text-muted);
}
.content blockquote p { color: var(--text-muted); }

/* === CALLOUT CONTAINERS === */
.callout {
  padding: 16px 24px;
  margin: 24px 0;
  border-radius: 0 8px 8px 0;
  border-left: 4px solid;
  font-size: 14px;
  line-height: 1.7;
  display: block;
  width: 100%;
  box-sizing: border-box;
}
.callout p { margin: 0; color: var(--text); }
.callout p + p { margin-top: 10px; }
.callout a { color: var(--accent); }
.callout code { font-size: 12px; }
.callout ul, .callout ol { margin: 8px 0 4px 20px; }
.callout li { margin-bottom: 4px; }
.callout-key {
  border-color: var(--accent);
  background: rgba(212, 160, 23, 0.10);
}
.callout-tip {
  border-color: var(--green);
  background: rgba(80, 200, 120, 0.10);
}
.callout-pitfall {
  border-color: var(--orange);
  background: rgba(230, 126, 34, 0.10);
}
.callout-remember {
  border-color: var(--purple);
  background: rgba(167, 139, 250, 0.10);
}
.callout-reading {
  border-color: #2dd4bf;
  background: rgba(45, 212, 191, 0.10);
}
.callout-discuss {
  border-color: #7c8db5;
  background: rgba(124, 141, 181, 0.10);
}

/* === HR === */
.content hr {
  border: none;
  border-top: 1px solid rgba(212, 160, 23, 0.2);
  margin: 40px 0;
}

/* === RESPONSIVE === */
@media (max-width: 900px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .overlay.show {
    display: block;
  }
  .menu-toggle {
    display: block;
  }
  .main {
    margin-left: 0;
  }
  .content {
    padding: 60px 24px 60px;
  }
  .content h1 { font-size: 26px; }
  .content h2 { font-size: 20px; }
  .content pre {
    padding: 14px 16px;
    font-size: 12px;
    margin-left: -8px;
    margin-right: -8px;
    border-radius: 0;
  }
  .callout {
    padding: 12px 16px;
    font-size: 13px;
  }
  .content table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

/* === MERMAID DIAGRAMS === */
.mermaid {
  background: #0f1525;
  border: 1px solid rgba(212, 160, 23, 0.2);
  border-radius: 8px;
  padding: 24px;
  margin: 24px 0;
  text-align: center;
  overflow-x: auto;
}

/* === SCROLLBAR === */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: rgba(212, 160, 23, 0.25); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(212, 160, 23, 0.45); }
/* === PROMPT BLOCKS === */
.prompt-block { position: relative; background: rgba(45,212,191,0.06); border: 1px solid rgba(45,212,191,0.2); border-left: 3px solid var(--teal); border-radius: 0 6px 6px 0; padding: 10px 52px 10px 14px; margin: 10px 0; font-size: 13px; line-height: 1.6; font-style: italic; color: var(--text); }
.prompt-block .copy-btn { top: 6px; right: 6px; }

    /* === SITE SEARCH === */
    .search-wrap {
      padding: 12px 16px 4px;
      position: relative;
    }
    .search-wrap input {
      width: 100%;
      background: #0b1020;
      border: 1px solid rgba(212,160,23,0.3);
      border-radius: 6px;
      color: var(--text);
      font-size: 13px;
      padding: 7px 10px;
      outline: none;
      transition: border-color 0.15s;
    }
    .search-wrap input::placeholder { color: var(--text-muted); }
    .search-wrap input:focus { border-color: var(--accent); }    #site-search-results {
      display: none;
      position: absolute;
      top: calc(100% - 4px);
      left: 16px;
      right: 16px;
      background: #0d1525;
      border: 1px solid rgba(212,160,23,0.35);
      border-radius: 8px;
      box-shadow: 0 8px 32px rgba(0,0,0,0.7);
      z-index: 9999;
      max-height: 380px;
      overflow-y: auto;
    }
    #site-search-results.open { display: block; }
    .ssr-item {
      display: block;
      padding: 9px 14px;
      border-bottom: 1px solid #1a2035;
      text-decoration: none;
      color: inherit;
    }
    .ssr-item:last-child { border-bottom: none; }
    .ssr-item:hover { background: rgba(212,160,23,0.08); }
    .ssr-title { font-size: 13px; font-weight: 600; color: var(--accent); }
    .ssr-desc { font-size: 11px; color: var(--text-muted); margin-top: 2px; line-height: 1.4; }
    .ssr-tag {
      display: inline-block; font-size: 10px;
      background: rgba(212,160,23,0.1); border: 1px solid rgba(212,160,23,0.25);
      color: var(--accent); border-radius: 3px; padding: 1px 5px;
      margin-top: 3px; margin-right: 3px;
    }
    .ssr-empty { padding: 12px 14px; color: var(--text-muted); font-size: 12px; text-align: center; }

/* === BACK TO TOP === */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--accent);
  font-size: 20px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { background: var(--accent-bg); border-color: var(--accent); }

/* === ON-PAGE NAV === */
.page-nav {
  position: fixed;
  top: 100px;
  right: 24px;
  width: 200px;
  max-height: calc(100vh - 140px);
  overflow-y: auto;
  font-size: 12px;
  z-index: 50;
}
.page-nav-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.page-nav a {
  display: block;
  padding: 4px 0 4px 12px;
  color: var(--text-muted);
  text-decoration: none;
  border-left: 2px solid var(--border);
  transition: all 0.15s ease;
  line-height: 1.4;
}
.page-nav a:hover, .page-nav a.active { color: var(--accent); border-left-color: var(--accent); }
@media (max-width: 1200px) { .page-nav { display: none; } }

/* === CODE LANGUAGE LABELS === */
.content pre { position: relative; }
.code-lang {
  position: absolute;
  top: 0;
  right: 0;
  padding: 2px 10px;
  font-size: 11px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text-muted);
  background: rgba(42, 48, 69, 0.8);
  border-bottom-left-radius: 6px;
  border-top-right-radius: 7px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

/* === SCROLL PROGRESS === */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 280px;
  height: 3px;
  background: var(--accent);
  z-index: 150;
  transition: width 0.1s linear;
  width: 0%;
}
@media (max-width: 900px) { .scroll-progress { left: 0; } }