/* base.css — CSS variables, reset, typography */

:root {
  /* BRAND FIRE */
  --color-brand:         #E8511A;
  --color-brand-hover:   #D0430D;
  --color-brand-light:   #FFF1EB;
  --color-brand-soft:    rgba(232, 81, 26, 0.12);

  /* PYTHON BLUE */
  --color-blue:          #2B6CB0;
  --color-blue-light:    #EBF4FF;
  --color-blue-soft:     rgba(43, 108, 176, 0.12);

  /* NEUTRALS — warm paper */
  --color-bg:            #FAFAF7;
  --color-bg-secondary:  #F5F2ED;
  --color-bg-hover:      #EDE8E1;
  --color-bg-code:       #F0EDE8;
  --color-surface:       #FFFFFF;

  /* BORDERS */
  --color-border:        #E0DAD2;
  --color-border-subtle: #EBE6DF;

  /* TEXT */
  --color-text:           #1C1917;
  --color-text-secondary: #57534E;
  --color-text-muted:     #A8A29E;

  /* CODE BLOCK */
  --color-code-bg:        #0F1117;
  --color-code-border:    #1E2332;

  /* SEMANTIC */
  --color-success: #16A34A;
  --color-warning: #D97706;
  --color-new-badge: #7C3AED;

  /* TYPOGRAPHY */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  /* LAYOUT */
  --sidebar-width:      268px;
  --toc-width:          228px;
  --topbar-height:      58px;
  --content-max-width:  840px;
  --radius:             8px;
  --radius-lg:          12px;
  --radius-xl:          18px;

  /* SHADOWS */
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.08);
  --shadow-md:  0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg:  0 8px 32px rgba(0,0,0,0.12);
}

[data-theme="dark"] {
  --color-bg:            #0F0E0D;
  --color-bg-secondary:  #171614;
  --color-bg-hover:      #1E1C1A;
  --color-bg-code:       #161412;
  --color-surface:       #1A1817;
  --color-border:        #2A2724;
  --color-border-subtle: #221F1C;
  --color-text:          #E8E3DC;
  --color-text-secondary:#B5AEA6;
  --color-text-muted:    #6B6560;
  --color-brand-light:   #2A160C;
  --color-blue-light:    #0D1A26;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--topbar-height) + 24px);
  /* without this, the off-canvas mobile sidebar (position:fixed +
   * translateX(-100%)) inflates the layout viewport on mobile Chrome,
   * which throws off vw-based centering for fixed overlays (e.g. the
   * mermaid fullscreen modal renders off-center). */
  overflow-x: clip;
}

body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
  overflow-x: clip; /* clip не создаёт scroll-контейнер — не блокирует inner scroll на iOS */
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-brand);
  text-decoration: none;
}

a:hover { text-decoration: underline; }

img, svg { display: block; max-width: 100%; }

/* ── TYPOGRAPHY ── */

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
}

/* Content area headings */
.prose h1 { font-size: 2rem; font-weight: 800; margin-bottom: 1.5rem; }
.prose h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--color-border);
}
.prose h3 { font-size: 1.1rem; font-weight: 650; margin-top: 1.75rem; margin-bottom: 0.5rem; }
.prose h4 { font-size: 1rem; font-weight: 650; margin-top: 1.25rem; margin-bottom: 0.4rem; }

.prose p { margin-bottom: 1rem; }
.prose ul, .prose ol { margin-bottom: 1rem; padding-left: 1.5rem; }
.prose li { margin-bottom: 0.25rem; }
.prose strong { font-weight: 650; }
.prose em { font-style: italic; }
.prose blockquote {
  border-left: 3px solid var(--color-brand);
  padding: 0.5rem 1rem;
  margin: 1.25rem 0;
  background: var(--color-brand-light);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--color-text-secondary);
}

/* Inline code */
.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-bg-code);
  border: 1px solid var(--color-border);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--color-text);
}

/* Code blocks */
.code-wrap {
  position: relative;
  margin: 1.25rem 0;
}

.prose pre {
  background: var(--color-code-bg);
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-x: contain;
  touch-action: pan-x pan-y;
  margin: 0;
  white-space: pre;
}

.prose pre code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: transparent;
  border: none;
  padding: 0;
  color: #E8E3DC;
  line-height: 1.65;
  display: block;
  white-space: pre;
  word-break: normal;
  overflow-wrap: normal;
}

/* Copy button — outside pre, inside .code-wrap, always top-right */
.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: rgba(255, 255, 255, 0.55);
  border-radius: var(--radius);
  padding: 0.25rem 0.55rem;
  font-size: 0.72rem;
  font-weight: 500;
  font-family: var(--font-sans);
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s, background 0.15s, color 0.15s;
  white-space: nowrap;
  z-index: 2;
}
.code-wrap:hover .copy-btn { opacity: 1; }
.copy-btn:hover {
  background: rgba(255, 255, 255, 0.18);
  color: rgba(255, 255, 255, 0.9);
}
.copy-btn.copied {
  background: rgba(22, 163, 74, 0.25);
  color: #4ade80;
  border-color: rgba(22, 163, 74, 0.4);
  opacity: 1;
}

/* Tables */
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.9em;
}
.prose th {
  background: var(--color-bg-secondary);
  font-weight: 650;
  text-align: left;
  padding: 0.6rem 0.875rem;
  border: 1px solid var(--color-border);
}
.prose td {
  padding: 0.5rem 0.875rem;
  border: 1px solid var(--color-border-subtle);
  vertical-align: top;
}
.prose tr:nth-child(even) td { background: var(--color-bg-secondary); }

/* Admonitions */
.admonition {
  margin: 1.25rem 0;
  padding: 0.875rem 1.125rem;
  border-radius: var(--radius-lg);
  border-left: 3px solid;
}
.admonition-title {
  font-weight: 700;
  margin-bottom: 0.4rem;
  font-size: 0.9em;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.admonition.note   { background: var(--color-blue-light);  border-color: var(--color-blue); }
.admonition.tip    { background: #F0FDF4; border-color: var(--color-success); }
.admonition.warning{ background: #FFFBEB; border-color: var(--color-warning); }
.admonition.danger { background: #FFF1F2; border-color: #E11D48; }
.admonition.new    { background: #F5F3FF; border-color: var(--color-new-badge); }

.admonition.note    .admonition-title { color: var(--color-blue); }
.admonition.tip     .admonition-title { color: var(--color-success); }
.admonition.warning .admonition-title { color: var(--color-warning); }
.admonition.danger  .admonition-title { color: #E11D48; }
.admonition.new     .admonition-title { color: var(--color-new-badge); }

/* Collapsible solution blocks (pymdownx.details → <details class="solution">) */
.prose details.solution {
  margin: 1.5rem 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-bg-secondary);
  overflow: hidden;
}
.prose details.solution > summary {
  cursor: pointer;
  padding: 0.6rem 1rem;
  font-weight: 700;
  font-size: 0.8em;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-brand);
  border-left: 3px solid var(--color-brand);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5em;
  user-select: none;
  border-bottom: 1px solid transparent;
  transition: background 0.12s, border-color 0.12s;
}
.prose details.solution > summary:hover {
  background: var(--color-bg-hover);
}
.prose details.solution > summary::-webkit-details-marker { display: none; }
.prose details.solution > summary::before {
  content: "▶";
  font-size: 0.6em;
  display: inline-block;
  transition: transform 0.18s ease;
  flex-shrink: 0;
}
.prose details.solution[open] > summary::before { transform: rotate(90deg); }
.prose details.solution[open] > summary { border-bottom-color: var(--color-border); }
.prose details.solution > .highlight        { margin: 1rem 1.125rem; }
.prose details.solution > .highlight:last-child { margin-bottom: 1rem; }
.prose details.solution > p                 { padding: 0.5rem 1.125rem; margin: 0; }

/* Anchor links from toc extension */
.prose .headerlink {
  opacity: 0;
  margin-left: 0.4em;
  font-size: 0.8em;
  transition: opacity 0.15s;
}
.prose h2:hover .headerlink,
.prose h3:hover .headerlink { opacity: 0.5; }

/* ── UTILITIES ── */

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* Google Fonts preload */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');