/* latin-ext */
@font-face {
  font-family: 'DM Sans';
  font-style: italic;
  font-weight: 100 1000;
  font-display: swap;
  src: url(/fonts/dm-sans/dm-sans-latin-ext-italic.woff2) format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
/* latin */
@font-face {
  font-family: 'DM Sans';
  font-style: italic;
  font-weight: 100 1000;
  font-display: swap;
  src: url(/fonts/dm-sans/dm-sans-latin-italic.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
/* latin-ext */
@font-face {
  font-family: 'DM Sans';
  font-style: normal;
  font-weight: 100 1000;
  font-display: swap;
  src: url(/fonts/dm-sans/dm-sans-latin-ext-normal.woff2) format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
/* latin */
@font-face {
  font-family: 'DM Sans';
  font-style: normal;
  font-weight: 100 1000;
  font-display: swap;
  src: url(/fonts/dm-sans/dm-sans-latin-normal.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* Shared roles keep every course section on the same readable text scale. */
.interactive-course {
  --font-text: 'DM Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-code: ui-monospace, SFMono-Regular, Consolas, monospace;
  --text-title: 32px;
  --text-heading: 24px;
  --text-subheading: 18px;
  --text-body: 16px;
  --text-label: 14px;
  --text-code: 14px;
  --leading-body: 1.7;
  font-optical-sizing: auto;
}
.lesson-main { font-size: var(--text-body); line-height: var(--leading-body); }
.lesson-main h1 { font-size: var(--text-title); line-height: 1.25; }
.lesson-main h2 { font-size: var(--text-heading); line-height: 1.35; }
.lesson-main h3 { font-size: var(--text-subheading); line-height: 1.4; }
.lesson-main code, .lesson-main pre { font-family: var(--font-code); font-size: var(--text-code); }
.lesson-main .lesson-controls button { font-size: var(--text-label); }