/* data-style.css — тема для гайда по dataclass в Python */
:root {
  --bg: #f5f7fa;
  --text: #0f172a;
  --accent: #306998;
  --accent-dark: #1e4d7a;
  --accent-light: #d4e6f1;
  --card-bg: #ffffff;
  --border: #c0d4e3;
  --sidebar-bg: #ffffff;
  --header-bg: linear-gradient(135deg, #1e4d7a, #306998);
  --header-text: #ffffff;
  --code-bg: #1e293b;
  --code-text: #e2e8f0;
  --hover: #e8f0f8;
  --footer-bg: #0f172a;
  --footer-text: #94a3b8;
  --info-bg: #d4e6f1;
  --warn-bg: #fef3c7;
  --warn-border: #f59e0b;
  --success-bg: #dcfce7;
  --success-border: #22c55e;
  --danger-bg: #fee2e2;
  --danger-border: #ef4444;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  font-size: 16px;
}
.wrapper {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
header {
  background: var(--header-bg);
  color: var(--header-text);
  padding: 32px 40px;
  border-radius: 16px;
  margin-bottom: 24px;
}
header h1 { font-size: 30px; font-weight: 700; }
header h1 a { color: #fff; text-decoration: none; }
header .subtitle { opacity: 0.9; margin-top: 8px; font-size: 16px; max-width: 700px; }
header .meta { margin-top: 12px; font-size: 13px; opacity: 0.75; }
.layout { display: flex; gap: 24px; flex: 1; }
.sidebar {
  width: 260px; flex-shrink: 0;
  background: var(--sidebar-bg);
  border-radius: 12px; padding: 20px 0;
  border: 1px solid var(--border);
  height: fit-content; position: sticky; top: 20px;
  max-height: calc(100vh - 80px); overflow-y: auto;
}
.sidebar h3 {
  font-size: 13px; text-transform: uppercase; letter-spacing: 1px;
  color: var(--accent); padding: 0 20px 12px;
  border-bottom: 1px solid var(--border); margin-bottom: 8px;
}
.sidebar ul { list-style: none; }
.sidebar li a {
  display: block; padding: 5px 20px; color: var(--text);
  text-decoration: none; font-size: 12.5px; transition: background 0.2s;
  border-left: 3px solid transparent; line-height: 1.4;
}
.sidebar li a:hover, .sidebar li a.active {
  background: var(--hover); border-left-color: var(--accent); color: var(--accent);
}
.sidebar .toc-h2 { font-weight: 600; padding-top: 7px; padding-bottom: 3px; }
.sidebar .toc-h3 { padding-left: 34px; font-size: 12px; }

main {
  flex: 1; min-width: 0;
  background: var(--card-bg); border-radius: 12px; padding: 40px;
  border: 1px solid var(--border);
}
main h2 {
  font-size: 26px; color: var(--accent-dark);
  margin: 40px 0 16px; padding-bottom: 12px;
  border-bottom: 3px solid var(--accent-light); scroll-margin-top: 24px;
}
main h2:first-child { margin-top: 0; }
main h3 { font-size: 20px; color: var(--text); margin: 28px 0 12px; scroll-margin-top: 24px; }
main h4 { font-size: 17px; color: var(--accent-dark); margin: 22px 0 10px; }
main h5 { font-size: 15px; color: var(--text); margin: 18px 0 8px; font-weight: 600; }
main p { margin: 12px 0; }
main ul, main ol { margin: 10px 0 10px 28px; }
main li { margin: 5px 0; line-height: 1.6; }
main li > ul, main li > ol { margin: 4px 0 4px 24px; }

code {
  background: var(--code-bg); color: var(--code-text);
  padding: 3px 8px; border-radius: 5px;
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.87em;
}
pre {
  background: var(--code-bg); color: var(--code-text);
  padding: 18px 22px; border-radius: 10px; overflow-x: auto;
  margin: 14px 0; border: 1px solid #334155;
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 14px; line-height: 1.6;
}
pre code { background: none; padding: 0; color: inherit; }

table {
  width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 14px;
}
th, td { border: 1px solid var(--border); padding: 10px 14px; text-align: left; vertical-align: top; }
th { background: var(--accent-light); font-weight: 600; color: var(--accent-dark); }
tr:nth-child(even) { background: #f8fafc; }

.info-box, .warn-box, .success-box, .danger-box {
  padding: 14px 18px; border-radius: 0 10px 10px 0; margin: 14px 0; font-size: 14px;
}
.info-box { background: var(--info-bg); border-left: 5px solid var(--accent); }
.warn-box { background: var(--warn-bg); border-left: 5px solid var(--warn-border); }
.success-box { background: var(--success-bg); border-left: 5px solid var(--success-border); }
.danger-box { background: var(--danger-bg); border-left: 5px solid var(--danger-border); }

.tag {
  display: inline-block; padding: 2px 10px; border-radius: 20px;
  font-size: 12px; font-weight: 600; margin: 2px 4px 2px 0;
}
.tag-blue { background: #dbeafe; color: #1d4ed8; }
.tag-green { background: #dcfce7; color: #16a34a; }
.tag-yellow { background: #fef3c7; color: #d97706; }

footer {
  margin-top: 24px; background: var(--footer-bg); color: var(--footer-text);
  padding: 18px 28px; border-radius: 12px; text-align: center; font-size: 13px;
}

/* ===== HAMBURGER MENU BUTTON ===== */
.menu-toggle {
  display: none;
  position: absolute;
  top: 20px;
  right: 20px;
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 8px;
  cursor: pointer;
  z-index: 101;
  padding: 0;
  align-items: center;
  justify-content: center;
}
.menu-toggle span,
.menu-toggle span::before,
.menu-toggle span::after {
  display: block;
  width: 20px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  position: relative;
  transition: 0.3s;
}
.menu-toggle span::before,
.menu-toggle span::after {
  content: '';
  position: absolute;
  left: 0;
}
.menu-toggle span::before { top: -6px; }
.menu-toggle span::after { top: 6px; }

/* ===== SIDEBAR CLOSE BUTTON ===== */
.sidebar-close {
  display: none;
  position: absolute;
  top: 12px;
  right: 12px;
  width: 32px;
  height: 32px;
  background: transparent;
  border: none;
  color: var(--text);
  font-size: 28px;
  cursor: pointer;
  line-height: 1;
  border-radius: 6px;
  z-index: 102;
  align-items: center;
  justify-content: center;
  padding: 0;
}
.sidebar-close:hover { background: var(--hover); }

/* ===== SIDEBAR OVERLAY ===== */
.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0,0,0,0.5);
  z-index: 98;
  opacity: 0;
  transition: opacity 0.3s;
}
.sidebar-overlay.active {
  opacity: 1;
}

@media (max-width: 900px) {
  .menu-toggle { display: flex; }
  .sidebar-close { display: flex; }
  .sidebar-overlay { display: block; pointer-events: none; }
  .sidebar-overlay.active { pointer-events: auto; }

  header { position: relative; padding-right: 64px; }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 300px;
    max-width: 80vw;
    height: 100vh;
    max-height: 100vh;
    z-index: 99;
    border-radius: 0 16px 16px 0;
    border: none;
    border-right: 1px solid var(--border);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    overflow-y: auto;
    padding-top: 48px;
  }
  .sidebar.active { transform: translateX(0); }
  .sidebar ul { display: block; padding: 0 0 24px; }
  .sidebar li a { border-left: 3px solid transparent; padding: 8px 20px; font-size: 13px; border-radius: 0; }
  .sidebar .toc-h3 { padding-left: 34px; }
  .sidebar h3 { padding: 0 20px 12px; font-size: 13px; }

  .layout { flex-direction: column; }
  main { padding: 20px 18px; }
  header { padding: 20px 18px; }
  header h1 { font-size: 22px; }
  header .subtitle { font-size: 14px; }
  header .meta { font-size: 12px; }
  table { font-size: 12px; }
  th, td { padding: 7px 8px; }
  .info-box, .warn-box, .success-box, .danger-box { padding: 11px 14px; font-size: 13px; }
  pre { padding: 14px 16px; font-size: 13px; }
  .formula { padding: 16px 18px; font-size: 16px; }
  main h2 { font-size: 23px; }
  main h3 { font-size: 18px; }
  main ul, main ol { margin-left: 20px; }
}
@media (max-width: 600px) {
  .wrapper { padding: 12px; }
  main { padding: 16px; }
  main h2 { font-size: 22px; }
}

#cursor-effect {
  position: fixed; top: 0; left: 0; width: 100vw; height: 100vh;
  pointer-events: none; z-index: -1;
}
.wrapper { position: relative; z-index: 1; }

body.sidebar-open { overflow: hidden; }