/* Shared base and reusable components for the design system page and the site.
   Theme-agnostic: everything here reads tokens from main.css / main-alt.css. */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 5rem; }
body {
  margin: 0;
  background: var(--color-background);
  color: var(--color-text-primary);
  font: var(--font-weight-regular) var(--font-size-md) / var(--line-height-normal) var(--font-family-body);
}
h1, h2, h3 {
  margin: 0;
  font-family: var(--font-family-title);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  text-wrap: balance;
}
p { margin: 0; }
::selection { background: var(--color-selection); }
:focus-visible { outline: 2px solid var(--color-focus-ring); outline-offset: 2px; }

.container {
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: max(var(--space-4), env(safe-area-inset-left, 0px));
}

/* Top bar */
.topbar {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}
.topbar .container {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-6);
  padding-block: var(--space-3);
}
.brand .brand-sub { color: var(--color-text-muted); font-weight: var(--font-weight-regular); }
.brand {
  font-family: var(--font-family-title);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.brand span { color: var(--color-primary); }
.topbar nav { display: flex; flex-wrap: wrap; gap: var(--space-1) var(--space-4); font-size: var(--font-size-sm); }
.topbar nav a { color: var(--color-text-secondary); text-decoration: none; padding-block: var(--space-1); }
.topbar nav a:hover { color: var(--color-text-link); }

/* Menu: a row on wide screens, a hamburger dropdown below 48rem (see breakpoints at the end) */
.menu {
  display: flex;
  flex: 1;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-6);
}
.menu-check { position: fixed; top: 0; left: 0; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
.burger {
  display: none;
  place-items: center;
  width: var(--control-height-md);
  height: var(--control-height-md);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.burger .bars,
.burger .bars::before,
.burger .bars::after {
  display: block;
  width: 1.25rem;
  height: 2px;
  background: var(--color-text-primary);
  transition: top var(--duration-normal) var(--easing-standard), rotate var(--duration-normal) var(--easing-standard), background var(--duration-fast);
}
.burger .bars { position: relative; }
.burger .bars::before, .burger .bars::after { content: ""; position: absolute; left: 0; }
.burger .bars::before { top: -6px; }
.burger .bars::after { top: 6px; }
.menu-check:checked + .burger .bars { background: transparent; }
.menu-check:checked + .burger .bars::before { top: 0; rotate: 45deg; }
.menu-check:checked + .burger .bars::after { top: 0; rotate: -45deg; }
.menu-check:focus-visible + .burger { outline: 2px solid var(--color-focus-ring); outline-offset: 2px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: var(--control-height-md);
  padding-inline: var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-text-on-primary);
  font: var(--font-weight-semibold) var(--font-size-sm) / 1 var(--font-family-body);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background var(--duration-fast) var(--easing-standard);
}
.btn:hover { background: var(--color-primary-hover); }
.btn:active { background: var(--color-primary-active); }
.btn.ghost { background: transparent; color: var(--color-text-primary); border-color: var(--color-border-strong); }
.btn.ghost:hover { background: var(--color-surface-sunken); }
.btn.sm { height: var(--control-height-sm); padding-inline: var(--space-3); font-size: var(--font-size-xs); }
.btn.ghost[aria-pressed="true"] { background: var(--color-primary-subtle); border-color: var(--color-primary); }

/* Mode and theme switchers */
.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); }
.segmented {
  display: inline-flex;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.segmented button {
  height: var(--control-height-sm);
  padding-inline: var(--space-3);
  border: 0;
  border-right: 1px solid var(--color-border-strong);
  background: transparent;
  color: var(--color-text-secondary);
  font: var(--font-weight-semibold) var(--font-size-xs) / 1 var(--font-family-body);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background var(--duration-fast) var(--easing-standard);
}
.segmented button:last-child { border-right: 0; }
.segmented button:hover { background: var(--color-surface-sunken); }
.segmented button[aria-pressed="true"] { background: var(--color-primary); color: var(--color-text-on-primary); }
.segmented button:focus-visible { outline-offset: -2px; }

/* Forms */
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr)); gap: var(--space-4); }
.form-grid .wide { grid-column: 1 / -1; }
.field { display: grid; gap: var(--space-1); align-content: start; min-width: 0; }
.label { font: var(--font-weight-semibold) var(--font-size-sm) / var(--line-height-tight) var(--font-family-body); color: var(--color-text-primary); }
.label .opt { font-weight: var(--font-weight-regular); color: var(--color-text-muted); }
.help { font-size: var(--font-size-xs); color: var(--color-text-muted); }
.error { font-size: var(--font-size-xs); color: var(--color-danger); }
.success { font-size: var(--font-size-xs); color: var(--color-success); }

.input, .select, .textarea {
  width: 100%;
  height: var(--control-height-md);
  padding-inline: var(--space-3);
  background: var(--color-surface);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  font: var(--font-weight-regular) var(--font-size-md) / 1.2 var(--font-family-body);
  transition: border-color var(--duration-fast) var(--easing-standard), box-shadow var(--duration-fast) var(--easing-standard);
}
.input.sm, .select.sm { height: var(--control-height-sm); font-size: var(--font-size-sm); }
.input.lg, .select.lg { height: var(--control-height-lg); font-size: var(--font-size-lg); }
.textarea { height: auto; min-height: 6rem; padding-block: var(--space-3); line-height: var(--line-height-normal); resize: vertical; }
.input::placeholder, .textarea::placeholder { color: var(--color-text-muted); }
.input:hover:not(:disabled), .select:hover:not(:disabled), .textarea:hover:not(:disabled) { border-color: var(--color-text-muted); }
.input:focus-visible, .select:focus-visible, .textarea:focus-visible, .is-focus {
  outline: none;
  border-color: var(--color-focus-ring);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-focus-ring) 35%, transparent);
}
.select {
  appearance: none;
  padding-right: var(--space-8);
  background-image: linear-gradient(45deg, transparent 50%, currentColor 50%), linear-gradient(135deg, currentColor 50%, transparent 50%);
  background-position: calc(100% - 1.125rem) 50%, calc(100% - 0.8125rem) 50%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
}
.input[aria-invalid="true"], .select[aria-invalid="true"], .textarea[aria-invalid="true"] { border-color: var(--color-danger); background-color: var(--color-danger-subtle); }
.input.is-valid { border-color: var(--color-success); }
.input:disabled, .select:disabled, .textarea:disabled { background: var(--color-surface-sunken); color: var(--color-text-muted); cursor: not-allowed; opacity: 0.7; }

.choices { margin: 0; padding: 0; border: 0; display: grid; gap: var(--space-3); min-width: 0; }
.choices legend { padding: 0; margin-bottom: var(--space-2); font: var(--font-weight-semibold) var(--font-size-sm) / 1.2 var(--font-family-body); }
.check { display: flex; align-items: flex-start; gap: var(--space-3); cursor: pointer; }
.check:has(input:disabled) { cursor: not-allowed; opacity: 0.6; }
.check input {
  appearance: none;
  flex: none;
  display: grid;
  place-content: center;
  width: 1.25rem;
  height: 1.25rem;
  margin: 0.125rem 0 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  cursor: inherit;
  transition: background var(--duration-fast) var(--easing-standard), border-color var(--duration-fast) var(--easing-standard);
}
.check input[type="checkbox"] { border-radius: var(--radius-sm); }
.check input[type="radio"] { border-radius: var(--radius-full); }
.check input::before {
  content: "";
  width: 0.625rem;
  height: 0.625rem;
  background: var(--color-text-on-primary);
  transform: scale(0);
  transition: transform var(--duration-fast) var(--easing-standard);
}
.check input[type="checkbox"]::before { clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0%, 43% 62%); }
.check input[type="radio"]::before { border-radius: var(--radius-full); }
.check input:checked { background: var(--color-primary); border-color: var(--color-primary); }
.check input:checked::before { transform: scale(1); }
.check input:hover:not(:disabled):not(:checked) { border-color: var(--color-text-muted); }
.check input:focus-visible { outline: 2px solid var(--color-focus-ring); outline-offset: 2px; }
.check .text { display: grid; gap: 2px; }
.check .text b { font: var(--font-weight-medium) var(--font-size-md) / 1.3 var(--font-family-body); }
/* Switch: a checkbox with role="switch" */
.check input.switch { width: 2.5rem; height: 1.5rem; margin: 0; place-content: center start; border-radius: var(--radius-full); background: var(--color-border-strong); border-color: transparent; padding: 3px; }
.check input.switch::before { width: 1.125rem; height: 1.125rem; border-radius: var(--radius-full); clip-path: none; transform: none; background: #fff; transition: translate var(--duration-fast) var(--easing-standard); }
.check input.switch:checked { background: var(--color-primary); }
.check input.switch:checked::before { transform: none; translate: 1rem 0; }

.form-actions { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-6); }

/* Photo carousel. The track is a native scroll-snap scroller, so swiping, trackpads and arrow keys
   work without script. main.js only wires the arrows and thumbnails and tracks the current photo. Mobile friendly! */
.carousel { max-width: 60rem; }
.stage {
  position: relative;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--color-surface-sunken);
  box-shadow: var(--shadow-md);
}
.track {
  display: flex;
  height: 100%;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  scrollbar-width: none;
}
.track::-webkit-scrollbar { display: none; }
.track:focus-visible { outline: 2px solid var(--color-focus-ring); outline-offset: -2px; }
.slide {
  position: relative;
  flex: 0 0 100%;
  height: 100%;
  margin: 0;
  scroll-snap-align: center;
  scroll-snap-stop: always;
}
.slide figcaption {
  position: absolute;
  inset: auto 0 0 0;
  padding: var(--space-8) var(--space-6) var(--space-4);
  background: linear-gradient(transparent, rgb(0 0 0 / 70%));
  color: #fff;
  font-size: var(--font-size-sm);
}
.slide figcaption b { display: block; font: var(--font-weight-bold) var(--font-size-lg) / 1.2 var(--font-family-title); }
.counter {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-full);
  background: rgb(0 0 0 / 55%);
  color: #fff;
  font: var(--font-weight-medium) var(--font-size-xs) / 1 var(--font-family-mono);
  font-variant-numeric: tabular-nums;
  pointer-events: none;
}
.arrow {
  position: absolute;
  top: 50%;
  translate: 0 -50%;
  display: grid;
  place-items: center;
  width: var(--control-height-lg);
  height: var(--control-height-lg);
  padding: 0;
  border: 0;
  border-radius: var(--radius-full);
  background: rgb(0 0 0 / 55%);
  color: #fff;
  font: var(--font-size-2xl) / 1 var(--font-family-body);
  cursor: pointer;
  transition: background var(--duration-fast) var(--easing-standard), opacity var(--duration-fast) var(--easing-standard);
}
.arrow:hover:not(:disabled) { background: var(--color-primary); }
.arrow:disabled { opacity: 0.35; cursor: default; }
.arrow.prev { left: var(--space-3); }
.arrow.next { right: var(--space-3); }
.arrow.prev::before { content: "‹"; }
.arrow.next::before { content: "›"; }
/* On touch screens people swipe, so the arrows get out of the way (this goes for tablets as well, but we can switch that if we want) */
@media (hover: none) and (pointer: coarse) { .arrow { display: none; } }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

.thumbs {
  position: relative;
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-3);
  padding: 4px;
  overflow-x: auto;
  scroll-behavior: smooth;
  scrollbar-width: thin;
}
.thumb {
  position: relative;
  flex: 0 0 calc((100% - 5 * var(--space-2)) / 6);
  aspect-ratio: 3 / 2;
  padding: 0;
  border: 0;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background: var(--color-surface-sunken);
  opacity: 0.55;
  outline: 2px solid transparent;
  outline-offset: 2px;
  cursor: pointer;
  transition: opacity var(--duration-fast) var(--easing-standard), outline-color var(--duration-fast) var(--easing-standard);
}
.thumb:hover { opacity: 0.9; }
.thumb[aria-current="true"] { opacity: 1; outline-color: var(--color-primary); }
.thumb:focus-visible { outline-color: var(--color-focus-ring); outline-style: dashed; }
@media (max-width: 40rem) { .thumb { flex-basis: 30%; } }

/* Placeholder photos. Replace each .photo with an <img> (object-fit: cover) when real images are ready. */
.photo {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: var(--space-1);
  text-align: center;
  color: #fff;
  background: linear-gradient(135deg, color-mix(in srgb, var(--tint) 85%, black), color-mix(in srgb, var(--tint) 45%, var(--color-surface-sunken)));
}
.photo .n { font: var(--font-weight-bold) var(--font-size-3xl) / 1 var(--font-family-title); text-transform: uppercase; }
.photo .hint { font: var(--font-weight-medium) var(--font-size-xs) / 1 var(--font-family-mono); opacity: 0.8; }
.thumbs .photo .n { font-size: var(--font-size-lg); }
/* Portrait photos keep the stage's height and sit centered, leaving empty space on either side.
   With real images use: img { height: 100%; width: 100%; object-fit: contain; } */
.photo.portrait { inset: 0 auto; left: 50%; translate: -50% 0; width: auto; height: 100%; aspect-ratio: 2 / 3; }
.p1 { --tint: var(--color-primary); }
.p2 { --tint: var(--color-secondary); }
.p3 { --tint: var(--color-accent); }
.p4 { --tint: var(--color-primary-active); }
.p5 { --tint: var(--color-secondary-hover); }
.p6 { --tint: var(--color-text-muted); }

/* Breakpoints: 64rem, 48rem (hamburger), 40rem, 30rem. Desktop first. */
@media (max-width: 48rem) {
  .burger { display: grid; margin-left: auto; }
  .menu {
    display: none;
    flex-basis: 100%;
    flex-direction: column;
    align-items: stretch;
    max-height: calc(100dvh - 4.5rem);
    overflow-y: auto;
    padding-bottom: var(--space-2);
  }
  .menu-check:checked ~ .menu { display: flex; }
  .topbar nav { flex-direction: column; gap: 0; font-size: var(--font-size-md); }
  .topbar nav a { padding-block: var(--space-3); border-bottom: 1px solid var(--color-border); }
  .toolbar { padding-top: var(--space-2); }
}
@media (max-width: 40rem) {
  .arrow { width: var(--control-height-md); height: var(--control-height-md); font-size: var(--font-size-xl); }
  .arrow.prev { left: var(--space-2); }
  .arrow.next { right: var(--space-2); }
  .slide figcaption { padding: var(--space-6) var(--space-4) var(--space-3); }
  .photo .n { font-size: var(--font-size-2xl); }
}
@media (max-width: 30rem) {
  .brand .brand-sub { display: none; }
  .toolbar { flex-direction: column; align-items: stretch; }
  .segmented { display: flex; }
  .segmented button { flex: 1; }
  .toolbar .btn { width: 100%; }
  .slide figcaption { font-size: var(--font-size-xs); }
  .slide figcaption b { font-size: var(--font-size-md); }
}
@media (prefers-reduced-motion: reduce) {
  html, .track, .thumbs { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}

/* Site parts: shared by the example site and shown in the design system's "Site parts" section. */
.stack > * + * { margin-top: var(--space-4); }
.prose { max-width: 70ch; }
.prose > * + * { margin-top: var(--space-4); }
.card {
  padding: var(--space-6);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}
.badge {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  background: var(--color-primary-subtle);
  color: var(--color-text-primary);
  border: 1px solid var(--color-primary);
  font: var(--font-weight-semibold) var(--font-size-xs) / 1.2 var(--font-family-body);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
/* Stitching: a dashed line, like the seam on a leather jacket. */
.stitch { border: 0; border-top: 2px dashed var(--color-border-strong); margin-block: var(--space-6); }
/* Diagonal red and blue stripes, echoing the flyer. */
.stripe-divider {
  display: block;
  width: 6rem;
  height: 0.75rem;
  margin-block: var(--space-4);
  background: linear-gradient(115deg, var(--color-primary) 0 45%, transparent 45% 55%, var(--color-secondary) 55% 100%);
}
/* A grid that fits as many columns as there is room for, so any number of items works. */
.auto-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(var(--grid-min, 9rem), 1fr));
  gap: var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
}