/* ============================================================
   Подготовка техлида iOS — Design System
   Art direction: техническое/образовательное → прохладные нейтрали,
   один акцент (электрик-индиго), моноширинный для кода/меток.
   ============================================================ */

/* ---------- Type scale ---------- */
:root {
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);

  --space-1: 0.25rem;  --space-2: 0.5rem;  --space-3: 0.75rem;
  --space-4: 1rem;     --space-5: 1.25rem; --space-6: 1.5rem;
  --space-8: 2rem;     --space-10: 2.5rem; --space-12: 3rem;
  --space-16: 4rem;    --space-20: 5rem;   --space-24: 6rem; --space-32: 8rem;

  --radius-sm: 0.375rem; --radius-md: 0.5rem; --radius-lg: 0.75rem;
  --radius-xl: 1rem; --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  --content-narrow: 680px;
  --content-default: 980px;
  --content-wide: 1240px;

  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Space Grotesk', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
}

/* ---------- Light theme ---------- */
:root, [data-theme='light'] {
  --color-bg: #f5f6f8;
  --color-surface: #ffffff;
  --color-surface-2: #fbfcfd;
  --color-surface-offset: #eef0f4;
  --color-surface-offset-2: #e6e9ef;
  --color-divider: #e2e5ec;
  --color-border: #d3d8e2;

  --color-text: #161922;
  --color-text-muted: #5b6172;
  --color-text-faint: #9aa1b2;
  --color-text-inverse: #f8f9fb;

  --color-primary: #4f46e5;
  --color-primary-hover: #4338ca;
  --color-primary-active: #3730a3;
  --color-primary-soft: #ecebfb;

  --color-accent: #0ea5a4;
  --color-accent-soft: #d7f4f3;

  --color-warning: #b45309;
  --color-warning-soft: #fcecd5;
  --color-success: #15803d;
  --color-success-soft: #d8f0e0;

  --shadow-sm: 0 1px 2px rgba(20,25,40,0.06);
  --shadow-md: 0 4px 14px rgba(20,25,40,0.08);
  --shadow-lg: 0 14px 36px rgba(20,25,40,0.12);

  --lvl1: #16a34a;   /* база */
  --lvl2: #d97706;   /* senior */
  --lvl3: #dc2626;   /* staff/lead */
}

/* ---------- Dark theme ---------- */
[data-theme='dark'] {
  --color-bg: #0d0f15;
  --color-surface: #14171f;
  --color-surface-2: #181c25;
  --color-surface-offset: #1b1f2a;
  --color-surface-offset-2: #20242f;
  --color-divider: #232734;
  --color-border: #2c3140;

  --color-text: #dde1ea;
  --color-text-muted: #8a90a2;
  --color-text-faint: #5a6071;
  --color-text-inverse: #14171f;

  --color-primary: #818cf8;
  --color-primary-hover: #a5b0fb;
  --color-primary-active: #6b76e8;
  --color-primary-soft: #1e2138;

  --color-accent: #2dd4bf;
  --color-accent-soft: #122a2a;

  --color-warning: #fbbf24;
  --color-warning-soft: #2a2210;
  --color-success: #4ade80;
  --color-success-soft: #122418;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 14px rgba(0,0,0,0.5);
  --shadow-lg: 0 14px 36px rgba(0,0,0,0.6);

  --lvl1: #34d399;
  --lvl2: #fbbf24;
  --lvl3: #f87171;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0d0f15; --color-surface: #14171f; --color-surface-2: #181c25;
    --color-surface-offset: #1b1f2a; --color-surface-offset-2: #20242f;
    --color-divider: #232734; --color-border: #2c3140;
    --color-text: #dde1ea; --color-text-muted: #8a90a2; --color-text-faint: #5a6071;
    --color-text-inverse: #14171f;
    --color-primary: #818cf8; --color-primary-hover: #a5b0fb; --color-primary-active: #6b76e8;
    --color-primary-soft: #1e2138; --color-accent: #2dd4bf; --color-accent-soft: #122a2a;
    --color-warning: #fbbf24; --color-warning-soft: #2a2210; --color-success: #4ade80; --color-success-soft: #122418;
    --lvl1: #34d399; --lvl2: #fbbf24; --lvl3: #f87171;
  }
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  -webkit-text-size-adjust: none; text-size-adjust: none;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility; scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}
body {
  min-height: 100dvh; line-height: 1.65;
  font-family: var(--font-body); font-size: var(--text-base);
  color: var(--color-text); background-color: var(--color-bg);
}
img, picture, video, svg { display: block; max-width: 100%; height: auto; }
ul[role='list'], ol[role='list'] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4, h5, h6 { text-wrap: balance; line-height: 1.18; font-family: var(--font-display); }
p, li { text-wrap: pretty; }
a { color: inherit; }
::selection { background: color-mix(in oklab, var(--color-primary) 25%, transparent); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }
button { cursor: pointer; background: none; border: none; }
table { border-collapse: collapse; width: 100%; }
a, button { transition: color var(--transition-interactive), background var(--transition-interactive),
  border-color var(--transition-interactive), box-shadow var(--transition-interactive); }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border-width: 0; }

/* ---------- Layout ---------- */
.wrap { width: 100%; max-width: var(--content-wide); margin-inline: auto; padding-inline: var(--space-6); }
.wrap--default { max-width: var(--content-default); }
.wrap--narrow { max-width: var(--content-narrow); }
main { display: block; }
section { padding-block: clamp(var(--space-12), 6vw, var(--space-24)); }
.section-tight { padding-block: clamp(var(--space-8), 4vw, var(--space-16)); }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklab, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-divider);
}
.site-header__inner { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); height: 4rem; }
.brand { display: flex; align-items: center; gap: var(--space-3); font-family: var(--font-display); font-weight: 600; text-decoration: none; color: var(--color-text); }
.brand svg { color: var(--color-primary); flex-shrink: 0; }
.brand span { font-size: var(--text-sm); letter-spacing: -0.01em; }
.nav { display: flex; align-items: center; gap: var(--space-1); }
.nav a {
  text-decoration: none; color: var(--color-text-muted); font-size: var(--text-sm);
  padding: var(--space-2) var(--space-3); border-radius: var(--radius-md); font-weight: 500;
}
.nav a:hover { color: var(--color-text); background: var(--color-surface-offset); }
.nav a.active { color: var(--color-primary); background: var(--color-primary-soft); }
.header-tools { display: flex; align-items: center; gap: var(--space-2); }
.theme-toggle { display: grid; place-items: center; width: 2.25rem; height: 2.25rem; border-radius: var(--radius-md); color: var(--color-text-muted); border: 1px solid var(--color-border); }
.theme-toggle:hover { color: var(--color-text); background: var(--color-surface-offset); }
.menu-btn { display: none; width: 2.25rem; height: 2.25rem; place-items: center; border-radius: var(--radius-md); border: 1px solid var(--color-border); color: var(--color-text); }

@media (max-width: 880px) {
  .nav {
    position: fixed; inset: 4rem 0 auto 0; flex-direction: column; align-items: stretch;
    background: var(--color-surface); border-bottom: 1px solid var(--color-divider);
    padding: var(--space-4); gap: var(--space-1); box-shadow: var(--shadow-lg);
    transform: translateY(-120%); transition: transform 240ms cubic-bezier(0.16,1,0.3,1);
  }
  .nav.open { transform: translateY(0); }
  .nav a { padding: var(--space-3) var(--space-4); }
  .menu-btn { display: grid; }
}

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding-block: clamp(var(--space-16), 10vw, var(--space-32)); }
.hero::before {
  content: ''; position: absolute; inset: 0; z-index: -1;
  background:
    radial-gradient(60% 80% at 80% 0%, color-mix(in oklab, var(--color-primary) 16%, transparent), transparent 70%),
    radial-gradient(50% 60% at 0% 100%, color-mix(in oklab, var(--color-accent) 13%, transparent), transparent 70%);
}
.hero__grid {
  position: absolute; inset: 0; z-index: -1; opacity: 0.5;
  background-image:
    linear-gradient(var(--color-divider) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-divider) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at 50% 30%, black, transparent 75%);
  -webkit-mask-image: radial-gradient(circle at 50% 30%, black, transparent 75%);
}
.eyebrow { display: inline-flex; align-items: center; gap: var(--space-2); font-family: var(--font-mono); font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.12em; color: var(--color-primary); background: var(--color-primary-soft); padding: var(--space-1) var(--space-3); border-radius: var(--radius-full); }
.hero h1 { font-size: var(--text-2xl); letter-spacing: -0.025em; margin-top: var(--space-5); max-width: 18ch; }
.hero .lede { font-size: var(--text-lg); color: var(--color-text-muted); margin-top: var(--space-5); max-width: 56ch; }
.hero__cta { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-8); }

/* ---------- Buttons ---------- */
.btn { display: inline-flex; align-items: center; gap: var(--space-2); text-decoration: none; font-weight: 600; font-size: var(--text-sm); padding: var(--space-3) var(--space-5); border-radius: var(--radius-md); border: 1px solid transparent; }
.btn--primary { background: var(--color-primary); color: #fff; }
.btn--primary:hover { background: var(--color-primary-hover); }
.btn--ghost { background: var(--color-surface); color: var(--color-text); border-color: var(--color-border); }
.btn--ghost:hover { background: var(--color-surface-offset); border-color: var(--color-primary); }

/* ---------- Cards ---------- */
.grid { display: grid; gap: var(--space-5); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 960px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

.card {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: var(--space-6);
  display: flex; flex-direction: column; gap: var(--space-3);
}
a.card { text-decoration: none; color: inherit; }
a.card:hover { border-color: var(--color-primary); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.card__num { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-primary); }
.card h3 { font-size: var(--text-lg); letter-spacing: -0.01em; }
.card p { color: var(--color-text-muted); font-size: var(--text-sm); }
.card__meta { margin-top: auto; font-size: var(--text-xs); color: var(--color-text-faint); font-family: var(--font-mono); }

/* ---------- Article / prose ---------- */
.prose { max-width: 74ch; }
.prose h2 { font-size: var(--text-xl); letter-spacing: -0.02em; margin-top: var(--space-12); margin-bottom: var(--space-4); padding-top: var(--space-4); scroll-margin-top: 5rem; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { font-size: var(--text-lg); margin-top: var(--space-8); margin-bottom: var(--space-3); }
.prose h4 { font-size: var(--text-base); font-weight: 700; margin-top: var(--space-6); margin-bottom: var(--space-2); font-family: var(--font-body); }
.prose p { margin-bottom: var(--space-4); }
.prose ul, .prose ol { margin: 0 0 var(--space-4) var(--space-6); display: flex; flex-direction: column; gap: var(--space-2); }
.prose li { padding-left: var(--space-1); }
.prose a { color: var(--color-primary); text-decoration: underline; text-decoration-color: color-mix(in oklab, var(--color-primary) 40%, transparent); text-underline-offset: 2px; }
.prose a:hover { text-decoration-color: var(--color-primary); }
.prose strong { color: var(--color-text); font-weight: 700; }
.prose blockquote {
  border-left: 3px solid var(--color-primary); background: var(--color-surface);
  padding: var(--space-4) var(--space-5); margin: var(--space-5) 0; border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--color-text-muted); font-size: var(--text-sm);
}
.prose blockquote p:last-child { margin-bottom: 0; }
.prose code {
  font-family: var(--font-mono); font-size: 0.875em;
  background: var(--color-surface-offset); padding: 0.15em 0.4em; border-radius: var(--radius-sm);
  color: var(--color-primary);
}
.prose pre {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); padding: var(--space-4) var(--space-5); overflow-x: auto;
  margin: var(--space-5) 0; font-size: var(--text-sm); line-height: 1.55;
}
.prose pre code { background: none; padding: 0; color: var(--color-text); }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; margin: var(--space-5) 0; border: 1px solid var(--color-border); border-radius: var(--radius-md); }
.prose table { font-size: var(--text-sm); }
.prose th, .prose td { text-align: left; padding: var(--space-3) var(--space-4); border-bottom: 1px solid var(--color-divider); vertical-align: top; }
.prose thead th { background: var(--color-surface-offset); font-family: var(--font-display); font-weight: 600; color: var(--color-text); white-space: nowrap; }
.prose tbody tr:last-child td { border-bottom: none; }
.prose tbody tr:hover { background: var(--color-surface-2); }

/* ---------- Page header ---------- */
.page-head { border-bottom: 1px solid var(--color-divider); padding-block: clamp(var(--space-10), 6vw, var(--space-16)); position: relative; overflow: hidden; }
.page-head::before { content: ''; position: absolute; inset: 0; z-index: -1; background: radial-gradient(50% 100% at 100% 0%, color-mix(in oklab, var(--color-primary) 10%, transparent), transparent 70%); }
.page-head h1 { font-size: var(--text-2xl); letter-spacing: -0.025em; margin-top: var(--space-3); }
.page-head p { color: var(--color-text-muted); font-size: var(--text-base); margin-top: var(--space-4); max-width: 60ch; }

/* ---------- Layout with sidebar (TOC) ---------- */
.doc-layout { display: grid; grid-template-columns: 260px 1fr; gap: var(--space-12); align-items: start; }
.toc { position: sticky; top: 5rem; font-size: var(--text-sm); max-height: calc(100dvh - 6rem); overflow-y: auto; }
.toc__title { font-family: var(--font-mono); font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.1em; color: var(--color-text-faint); margin-bottom: var(--space-3); }
.toc ul { list-style: none; display: flex; flex-direction: column; gap: var(--space-1); border-left: 1px solid var(--color-divider); }
.toc a { display: block; text-decoration: none; color: var(--color-text-muted); padding: var(--space-1) var(--space-3); margin-left: -1px; border-left: 2px solid transparent; }
.toc a:hover { color: var(--color-text); }
.toc a.active { color: var(--color-primary); border-left-color: var(--color-primary); }
@media (max-width: 1040px) { .doc-layout { grid-template-columns: 1fr; } .toc { display: none; } }

/* ---------- Badges / levels ---------- */
.badge { display: inline-flex; align-items: center; gap: var(--space-1); font-family: var(--font-mono); font-size: var(--text-xs); padding: 0.1em 0.55em; border-radius: var(--radius-full); border: 1px solid var(--color-border); white-space: nowrap; }
.lvl1 { color: var(--lvl1); border-color: color-mix(in oklab, var(--lvl1) 40%, transparent); }
.lvl2 { color: var(--lvl2); border-color: color-mix(in oklab, var(--lvl2) 40%, transparent); }
.lvl3 { color: var(--lvl3); border-color: color-mix(in oklab, var(--lvl3) 40%, transparent); }

/* ---------- Video cards ---------- */
.video-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: var(--space-5); }
.vcard { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); overflow: hidden; display: flex; flex-direction: column; }
.vcard:hover { border-color: var(--color-primary); box-shadow: var(--shadow-md); }
.vcard__thumb { position: relative; aspect-ratio: 16/9; display: block; background: var(--color-surface-offset); overflow: hidden; }
.vcard__thumb img { width: 100%; height: 100%; object-fit: cover; }
.vcard__thumb::after { content: ''; position: absolute; inset: 0; background: radial-gradient(circle at 50% 50%, rgba(0,0,0,0.05), rgba(0,0,0,0.25)); opacity: 0; transition: opacity var(--transition-interactive); }
.vcard__thumb:hover::after { opacity: 1; }
.vcard__play { position: absolute; inset: 0; margin: auto; width: 56px; height: 56px; display: grid; place-items: center; background: rgba(0,0,0,0.55); border-radius: var(--radius-full); color: #fff; backdrop-filter: blur(4px); z-index: 2; }
.vcard__body { padding: var(--space-4) var(--space-5); display: flex; flex-direction: column; gap: var(--space-2); flex: 1; }
.vcard__title { font-family: var(--font-display); font-weight: 600; font-size: var(--text-sm); text-decoration: none; color: var(--color-text); line-height: 1.3; }
.vcard__title:hover { color: var(--color-primary); }
.vcard__meta { font-size: var(--text-xs); color: var(--color-text-faint); display: flex; flex-wrap: wrap; gap: var(--space-2); align-items: center; }
.vcard__chapters { margin-top: var(--space-2); border-top: 1px solid var(--color-divider); padding-top: var(--space-3); display: flex; flex-direction: column; gap: var(--space-1); }
.vcard__chapters summary { cursor: pointer; font-size: var(--text-xs); font-family: var(--font-mono); color: var(--color-primary); list-style: none; user-select: none; }
.vcard__chapters summary::-webkit-details-marker { display: none; }
.vcard__chapters summary::before { content: '▸ '; }
.vcard__chapters[open] summary::before { content: '▾ '; }
.chap-list { display: flex; flex-direction: column; gap: 1px; margin-top: var(--space-2); }
.chap-list a { display: flex; gap: var(--space-2); font-size: var(--text-xs); text-decoration: none; color: var(--color-text-muted); padding: var(--space-1) var(--space-2); border-radius: var(--radius-sm); }
.chap-list a:hover { background: var(--color-surface-offset); color: var(--color-text); }
.chap-list .t { font-family: var(--font-mono); color: var(--color-primary); flex-shrink: 0; min-width: 3.2em; }

/* ---------- Mermaid ---------- */
.diagram { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: var(--space-6); margin: var(--space-6) 0; overflow-x: auto; }
.diagram h3 { font-size: var(--text-lg); margin-bottom: var(--space-4); }
.mermaid { display: flex; justify-content: center; }
.mermaid svg { max-width: 100%; height: auto; }

/* ---------- Callout ---------- */
.callout { display: flex; gap: var(--space-3); background: var(--color-surface); border: 1px solid var(--color-border); border-left: 3px solid var(--color-accent); border-radius: var(--radius-md); padding: var(--space-4) var(--space-5); margin: var(--space-5) 0; font-size: var(--text-sm); color: var(--color-text-muted); }
.callout strong { color: var(--color-text); }

/* ---------- Stat / metric ---------- */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: var(--space-4); }
.stat { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: var(--space-5); }
.stat__num { font-family: var(--font-display); font-size: var(--text-xl); font-weight: 700; color: var(--color-primary); }
.stat__label { font-size: var(--text-sm); color: var(--color-text-muted); margin-top: var(--space-1); }

/* ---------- Progress (localStorage-free, session) ---------- */
.progress-bar { height: 6px; background: var(--color-surface-offset); border-radius: var(--radius-full); overflow: hidden; }
.progress-bar__fill { height: 100%; background: linear-gradient(90deg, var(--color-primary), var(--color-accent)); border-radius: inherit; transition: width 300ms ease; width: 0; }
.check-item { display: flex; gap: var(--space-3); align-items: flex-start; padding: var(--space-3); border-radius: var(--radius-md); }
.check-item:hover { background: var(--color-surface-2); }
.check-item input { margin-top: 0.3em; width: 1.1em; height: 1.1em; accent-color: var(--color-primary); cursor: pointer; flex-shrink: 0; }
.check-item label { cursor: pointer; font-size: var(--text-sm); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--color-divider); padding-block: var(--space-12); margin-top: var(--space-16); color: var(--color-text-muted); font-size: var(--text-sm); }
.site-footer__grid { display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--space-8); }
.site-footer a { color: var(--color-text-muted); text-decoration: none; }
.site-footer a:hover { color: var(--color-primary); }
.site-footer__links { display: flex; flex-direction: column; gap: var(--space-2); }
.site-footer__note { max-width: 42ch; font-size: var(--text-xs); color: var(--color-text-faint); line-height: 1.6; }

/* ---------- Pill row ---------- */
.pills { display: flex; flex-wrap: wrap; gap: var(--space-2); margin: var(--space-4) 0; }
.pill { font-size: var(--text-xs); font-family: var(--font-mono); padding: var(--space-1) var(--space-3); border-radius: var(--radius-full); background: var(--color-surface-offset); color: var(--color-text-muted); border: 1px solid var(--color-border); }

/* ---------- Next/prev nav ---------- */
.page-nav { display: flex; justify-content: space-between; gap: var(--space-4); margin-top: var(--space-16); padding-top: var(--space-8); border-top: 1px solid var(--color-divider); flex-wrap: wrap; }
.page-nav a { text-decoration: none; color: var(--color-text-muted); font-size: var(--text-sm); display: flex; flex-direction: column; gap: var(--space-1); padding: var(--space-3) var(--space-4); border: 1px solid var(--color-border); border-radius: var(--radius-md); min-width: 200px; }
.page-nav a:hover { border-color: var(--color-primary); color: var(--color-text); }
.page-nav a span { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-text-faint); }
.page-nav a.next { text-align: right; margin-left: auto; }

/* ===== PDF download card (resources page) ===== */
.pdf-card {
  display: flex;
  gap: var(--space-5);
  align-items: flex-start;
  padding: var(--space-6);
  margin: var(--space-6) 0 var(--space-10);
  background: linear-gradient(150deg, var(--color-surface), var(--color-surface-offset));
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-lg, 16px);
  box-shadow: 0 10px 36px -16px var(--color-primary);
}
.pdf-card__icon {
  flex: none;
  display: grid;
  place-items: center;
  width: 64px;
  height: 80px;
  border-radius: 10px;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: .05em;
}
.pdf-card__body { flex: 1; min-width: 0; }
.pdf-card__body h3 { margin: 0 0 var(--space-2); font-size: var(--text-lg); line-height: 1.25; }
.pdf-card__body p { margin: 0 0 var(--space-4); color: var(--color-text-muted); }
.pdf-card__meta { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-5); }
.pdf-card__meta span {
  font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-text-muted);
  padding: 3px 10px; border: 1px solid var(--color-border); border-radius: 999px; background: var(--color-surface);
}
.pdf-card__actions { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.prose a.btn-pdf {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 600; font-size: var(--text-sm);
  text-decoration: none; text-decoration-color: transparent;
  padding: 11px 20px; border-radius: 10px;
  background: #4f46e5; color: #ffffff;
  border: 1px solid #4f46e5; transition: all .18s ease;
}
.prose a.btn-pdf:hover { background: #6b76e8; border-color: #6b76e8; transform: translateY(-1px); text-decoration: none; }
.prose a.btn-pdf--ghost { background: transparent; color: var(--color-primary); border-color: var(--color-primary); }
.prose a.btn-pdf--ghost:hover { background: var(--color-primary-soft); color: var(--color-primary); transform: translateY(-1px); }
@media (max-width: 640px) {
  .pdf-card { flex-direction: column; gap: var(--space-4); }
  .pdf-card__actions .btn-pdf { flex: 1; justify-content: center; }
}