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

/* ==================== ROOT VARIABLES ==================== */
:root {
  --bg: #fdfdfd;
  --text: #222;
  --header-bg: #0070c9;
  --table-even: #f5f9ff;
  --table-hover: #e3f2fd;
  --border: #ddd;
  --link: #0066d6;
  --link-hover: #c00;
  --toc-bg: #eaf3ff;
  --toc-hover: #d0e7ff;
  --control-bg: #333;
  --control-text: #fff;
}

body.dark-mode {
  --bg: #1a1a1a;
  --text: #e0e0e0;
  --header-bg: #005a9e;
  --table-even: #252525;
  --table-hover: #333;
  --border: #444;
  --link: #4da6ff;
  --link-hover: #ff6666;
  --toc-bg: #2a3f5f;
  --toc-hover: #1e2f4a;
  --control-bg: #444;
  --control-text: #fff;
}

/* ==================== TYPOGRAPHY & LAYOUT ==================== */
body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  padding: 1.5rem 0 5rem;
  transition: background 0.3s, color 0.3s;
}

header {
  max-width: 920px;
  margin: 0 auto 2rem;
  padding: 0 1rem;
}

h1 {
  font-size: 2.2rem;
  text-align: center;
  margin-bottom: 0.75rem;
  color: var(--text);
}

h2 {
  margin: 2.5rem 0 1rem;
  font-size: 1.5rem;
  border-bottom: 2px solid var(--border);
  padding-bottom: 0.3rem;
  color: var(--text);
}

a {
  color: var(--link);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover {
  color: var(--link-hover);
}

.badges {
  text-align: center;
  margin-bottom: 1rem;
}
.badges img {
  height: 28px;
  margin: 0 0.25rem;
}

blockquote {
  max-width: 800px;
  margin: 1rem auto;
  padding: 0.75rem 1.2rem;
  background: var(--table-even);
  border-left: 4px solid var(--header-bg);
  font-style: italic;
}

.note {
  max-width: 800px;
  margin: 0.75rem auto 1.5rem;
  font-size: 0.92rem;
  color: var(--text);
  opacity: 0.85;
}

/* ==================== GLOBAL SEARCH ==================== */
#globalSearch {
  display: block;
  margin: 1.5rem auto;
  padding: 0.65rem 1rem;
  width: min(500px, 90%);
  font-size: 1rem;
  border: 2px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  transition: border-color 0.3s;
}
#globalSearch:focus {
  outline: none;
  border-color: var(--header-bg);
}

/* ==================== TABLE OF CONTENTS ==================== */
#toc {
  max-width: 960px;
  margin: 0 auto 3rem;
  padding: 0 1rem;
}
#toc h2 {
  text-align: center;
  margin-bottom: 1rem;
}
.toc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.5rem;
}
.toc-grid a {
  display: block;
  padding: 0.5rem 0.7rem;
  background: var(--toc-bg);
  border-radius: 5px;
  text-align: center;
  font-weight: 600;
  font-size: 0.9rem;
  transition: background 0.2s;
}
.toc-grid a:hover {
  background: var(--toc-hover);
}

/* ==================== MAIN CONTENT ==================== */
main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1rem;
}

section {
  margin-bottom: 3rem;
}

/* ==================== TABLES ==================== */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.94rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border);
}

th, td {
  padding: 0.6rem 0.8rem;
  text-align: left;
  vertical-align: top;
  border: 1px solid var(--border);
}

th {
  background: var(--header-bg);
  color: #fff;
  font-weight: 600;
  font-size: 0.88rem;
}

tbody tr {
  transition: background 0.2s;
}
tbody tr:nth-child(even) {
  background: var(--table-even);
}
tbody tr:hover {
  background: var(--table-hover);
}
tbody tr.hide {
  display: none;
}

/* ==================== FOOTER ==================== */
footer {
  margin-top: 4rem;
  padding: 1.5rem 1rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text);
  opacity: 0.8;
  border-top: 1px solid var(--border);
}
footer a {
  font-weight: 600;
  text-decoration: underline;
}

/* ==================== FLOATING CONTROLS ==================== */
#controls {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 999;
}

#controls button {
  padding: 0.6rem 0.9rem;
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  background: var(--control-bg);
  color: var(--control-text);
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  transition: transform 0.2s, background 0.2s;
}

#controls button:hover {
  transform: translateY(-3px);
  background: var(--header-bg);
}

#controls button:active {
  transform: scale(0.95);
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.3rem; }
  .toc-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
  #controls { bottom: 10px; right: 10px; }
  #controls button { padding: 0.5rem 0.7rem; font-size: 0.85rem; }
}