@import url("reset.css");
@import url("variables.css");

/*
-----------------------------------------
CSS PROPERTIES & VALUES - QUICK REFERENCE
-----------------------------------------

CSS comments use /* and * / (without the space).

UNITS
px    = Pixels. Fixed CSS measurement.
%     = Percentage relative to another value,
        often the parent element.
em    = Relative to the element's font size
        (or parent's font size for font-size).
rem   = Relative to the root HTML font size.
vw    = 1% of the viewport width.
vh    = 1% of the viewport height.
ch    = Approximate width of the "0" character.

TYPOGRAPHY
font-family: Arial, sans-serif;
  Sets the typeface and fallback fonts.

font-size: 16px;
  Sets the size of the text.

font-weight: 400;
  Controls text weight.
  400 = Normal, 700 = Bold.
  Variable fonts may support values 100-900.

line-height: 1.5;
  Controls spacing between lines.
  1.5 means 1.5 times the font size.

letter-spacing: 2px;
  Controls spacing between characters.
  Negative values tighten spacing.

text-align: left;
  Aligns text: left, right, center, justify.

text-transform: uppercase;
  Changes appearance of text:
  uppercase, lowercase, capitalize, none.

COLOUR
color: #222222;
  Sets text colour.

background-color: #ffffff;
  Sets the background colour.

SPACING
margin: 20px;
  Space outside an element.

padding: 20px;
  Space inside an element.

margin-bottom: 20px;
  Adds space below an element.

WIDTH
width: 100%;
  Sets an element's width.

max-width: 800px;
  Limits how wide an element can become.

-----------------------------------------
*/


/*
03 — APPLYING VARIABLES / BASELINE BRIDGE
Numbering update: examples 01 and 02 have since been swapped at your request.
The original-number references below describe the files before that swap:
old 01 is now 02 (styled), and old 02 is now 01 (reset/reference).

The supplied example 02 has a reset and reference notes, but no typography
rules. Both originals are protected. Here we explicitly restore example 01's
basic typography and spacing, substituting variables for reusable values.
This necessary bridge is the only extra change in the colour lesson.
No grid, animation or experimental layout is introduced yet.
Try changing --font-size-h1 or --spacing-large in variables.css.
*/
body {
  background-color: var(--color-background);
  color: var(--color-text);
  font-family: var(--font-primary);
  font-size: var(--font-size-body);
  line-height: 1.6;
  padding: var(--spacing-large);
}
h1 {
  color: var(--color-primary);
  font-size: var(--font-size-h1);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -1px;
  margin-bottom: var(--spacing-medium);
}
h2 {
  color: var(--color-secondary);
  font-size: var(--font-size-h2);
  font-weight: 400;
  line-height: 1.3;
  margin-bottom: var(--spacing-heading);
}
p {
  font-size: var(--font-size-body);
  font-weight: 400;
  line-height: 1.6;
  letter-spacing: 0px;
  max-width: 650px;
  margin-bottom: var(--spacing-medium);
}
/* A long word can wrap on a narrow screen without introducing fluid sizing. */
h1, h2, p { overflow-wrap: break-word; }

/*
04 — EDITORIAL GRID
width: auto fills available space after padding. max-width caps the container
at 1280px. margin: 0 auto centres it using equal automatic side margins.
display: grid arranges direct children into tracks. repeat(3, ...) creates
three equal columns. 1fr means one share of free space; minmax(0, 1fr)
lets a column shrink below its content width. gap adds space BETWEEN tracks.
grid-column: 1 / -1 spans from the first to the last grid line.
align-items: start aligns the tops without stretching short paragraphs.
Try two columns or a larger gap. The single-column mobile lesson follows in 06.
*/
.editorial {
  width: auto;
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--spacing-large);
  align-items: start;
}
.edition, .editorial h1, .editorial h2 { grid-column: 1 / -1; }
.edition {
  color: var(--color-secondary);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  border-top: 2px solid var(--color-primary);
  padding-top: var(--spacing-small);
}
.editorial > p { border-top: 1px solid var(--color-primary); padding-top: var(--spacing-medium); }

/*
WORKSHOP NAVIGATION — shared across the ten examples
These ordinary links open the neighbouring folder without JavaScript.
inline-block keeps the arrows beside the example number. Padding gives each
arrow a comfortable click area; currentColor follows this page's text colour.
The navigation stays in normal flow above the content, so it cannot cover it.
An outline makes keyboard focus visible. Unavailable directions are plain
spans, not links, so they cannot accidentally navigate or receive focus.
*/
.example-navigation {
  font-family: inherit;
  font-size: 14px;
  line-height: 1;
  margin-bottom: 20px;
}
.example-navigation a,
.example-navigation .unavailable {
  display: inline-block;
  padding: 12px;
  font-size: 20px;
  color: inherit;
  text-decoration: none;
}
.example-navigation a:hover { text-decoration: underline; }
.example-navigation a:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 2px;
}
.example-navigation .unavailable { opacity: .35; }
.example-navigation .example-number { font-size: 12px; }