/* --- Buttons --- */
.btn {
  user-select: none;
  -webkit-user-select: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4em;
  font-family: var(--font-body);
  font-size: var(--font-size-btn);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.04em;
  text-decoration: none;
  border: 1px solid var(--color-transparent);
  border-radius: var(--radius-btn);
  box-shadow: 0 6px 16px var(--color-btn-shadow);
  cursor: pointer;
}

.btn:hover {
  box-shadow: 0 10px 24px var(--color-btn-shadow-hover);
}

.btn:focus-visible {
  outline: 2px solid var(--color-ink);
  outline-offset: 2px;
}

.btn--primary {
  padding: 0.95rem 1.75rem;
  background: var(--color-ink);
  color: var(--color-bg);
  border-color: var(--color-ink);
  font-family: var(--font-display);
  font-weight: var(--font-weight-regular);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

/* Main flow CTAs: slightly larger and heavier than other primary buttons. */
:is(.hero-cta, .downloads-back-link) .btn--primary {
  font-size: var(--font-size-accent);
  font-weight: var(--font-weight-cta-primary);
}

.btn--ghost {
  padding: 0.55rem 1rem;
  background: var(--color-transparent);
  color: var(--color-ink);
  border-color: var(--color-ink-faint);
}

.btn--ghost:hover {
  background: var(--color-ink-hover);
  border-color: var(--color-ink-border-strong);
}

.btn svg {
  flex-shrink: 0;
  fill: none;
  stroke: currentColor;
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.btn__label {
  display: inline-block;
  transform: translateY(var(--button-text-nudge-y));
}

.btn--primary svg {
  width: 1.15rem;
  height: 1.15rem;
}

.btn--ghost svg {
  width: 0.85rem;
  height: 0.85rem;
}

.btn svg.brand-icon {
  fill: currentColor;
  stroke: none;
}

/* On opening the menu, we scale the top and bottom bars, initially length 20px
and 16px apart, horizontally by 0.8, so that they're length 16px and thus form
the edges of a square. We also scale them by sqrt(2), so that they're long
enough to be the diagonals of that square. We then rotate them +/-45deg about
their right ends: transform-origin: 100% 50% so that they become the diagonals
of a square X. */
.menu-toggle {
  --menu-toggle-bar-scale: calc(1.414213562 * 0.8);
}

.menu-toggle svg {
  width: 1rem;
  height: 1rem;
  overflow: visible;
}

.menu-toggle__bar {
  transform-box: fill-box;
  transform-origin: 100% 50%;
}

.menu-toggle__bar--middle {
  transform-origin: 50% 50%;
}

.menu-toggle[aria-expanded="true"] .menu-toggle__bar--top {
  transform: rotate(-45deg) scaleX(var(--menu-toggle-bar-scale));
}

.menu-toggle[aria-expanded="true"] .menu-toggle__bar--middle {
  transform: scaleX(0);
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] .menu-toggle__bar--bottom {
  transform: rotate(45deg) scaleX(var(--menu-toggle-bar-scale));
}

/* Square hit target: .btn--ghost alone uses wider horizontal padding. */
.btn--ghost.menu-toggle {
  padding: 0.55rem;
  /* For visibility contrast against the maze background. */
  background: var(--color-bg);
}

.btn--ghost.menu-toggle:hover {
  background: var(--color-menu-toggle-hover-bg);
}

.menu-panel {
  --flip-duration: 1180ms;
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.5rem;
  min-width: min(16rem, calc(100vw - 2.5rem));
  padding: 0.65rem;
  border: 1px solid var(--color-ink-faint);
  border-radius: var(--radius-image);
  background: var(--color-bg);
  box-shadow: var(--shadow-soft);
}

menu-button {
  display: block;
  width: 100%;
}

menu-toggle-button {
  display: inline-block;
}

theme-toggle-button {
  display: block;
  width: 100%;
}

#site-menu.menu-panel {
  z-index: var(--z-site-menu);
}

.menu-panel[hidden] {
  display: none;
}

main .view-downloads.downloads-page {
  max-width: 42rem;
  margin-left: auto;
  margin-right: auto;
}

.downloads-note {
  margin: 0.2rem 0 0;
  max-width: 36rem;
  font-family: var(--font-dialog-body);
  font-size: var(--font-size-dialog-body);
  line-height: 1.55;
  color: var(--color-ink-muted);
  text-align: center;
}

/* No downloads note till Macondo is ready on downloads first paint (fonts-boot.js). */
html:not(.fonts-ready) .downloads-note {
  opacity: 0;
}

.downloads-nav {
  position: static;
  margin-top: 1.75rem;
  margin-left: auto;
  margin-right: auto;
  width: min(32rem, 100%);
  opacity: 1;
}

/* Downloads: Macondo on faces (#site-menu faces inherit display from .menu-card__face). */
.downloads-nav .menu-card__face {
  font-family: var(--font-stack-download);
}

:is(#site-menu, .downloads-nav) .menu-card__face {
  font-size: var(--font-size-accent);
  font-weight: var(--font-weight-menu-card);
}

.downloads-back-link {
  margin: 1.6rem 0 0;
}

.menu-panel .btn {
  position: relative;
  justify-content: flex-start;
  width: 100%;
  padding: 0;
  text-align: left;
  border-color: var(--color-transparent);
  background: var(--color-transparent);
  perspective: 900px;
}

/* Stagger flip timing by nav row; use flex children (menu-button or plain
button). */
:is(.menu-panel, .downloads-nav) > :nth-child(1) {
  --flip-duration: 200ms;
}

:is(.menu-panel, .downloads-nav) > :nth-child(2) {
  --flip-duration: 400ms;
}

:is(.menu-panel, .downloads-nav) > :nth-child(3) {
  --flip-duration: 800ms;
}

:is(.menu-panel, .downloads-nav) > :nth-child(4) {
  --flip-duration: 1600ms;
}

:is(.menu-panel, .downloads-nav) > :nth-child(5) {
  --flip-duration: 3200ms;
}

:is(.menu-panel, .downloads-nav) > :nth-child(6) {
  --flip-duration: 4800ms;
}

:is(.menu-panel, .downloads-nav) > :nth-child(7) {
  --flip-duration: 5200ms;
}

/* Theme toggle: label + icon show the target mode (sun -> light, moon -> dark). */
.theme-toggle-views {
  display: grid;
  align-items: center;
  width: 100%;
}

.theme-toggle-view {
  display: none;
  grid-area: 1 / 1;
  align-items: center;
  gap: 0.4em;
}

:root[data-theme="dark"] [data-theme-toggle] .theme-toggle-view--to-light,
:root[data-theme="light"] [data-theme-toggle] .theme-toggle-view--to-dark {
  display: flex;
}

.menu-card {
  position: relative;
  display: block;
  width: 100%;
}

.menu-card__face {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 0.4em;
  width: 100%;
  min-height: 2.1rem;
  padding: 0.55rem 1rem;
  border: 1px solid var(--color-ink-faint);
  border-radius: var(--radius-btn);
  background: var(--color-transparent);
  backface-visibility: hidden;
  font-family: var(--font-display);
  font-weight: var(--font-weight-regular);
}

.menu-card__face--front {
  transform: rotateX(180deg);
}

.menu-panel .btn:hover .menu-card__face {
  background: var(--color-ink-hover);
  border-color: var(--color-ink-border-strong);
}

@media (prefers-reduced-motion: reduce) {
  .menu-card {
    transform: none !important; /* Here we use !important as a cascade safety net, ensuring that this reduced-motion rule overrides the open-state transform even if their relative order in this style sheet changes. */
  }

  .menu-card__face--back {
    display: none;
  }

  .menu-card__face--front {
    position: static;
    transform: none;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .btn {
    transition:
      background 0.2s ease,
      color 0.2s ease,
      border-color 0.2s ease,
      box-shadow 0.2s ease,
      transform 0.15s ease;
  }

  .btn:hover {
    transform: translateY(-1px);
  }

  .btn--primary:active {
    transform: translateY(1px);
  }

  .menu-toggle__bar {
    transition:
      transform 0.2s ease,
      opacity 0.2s ease;
  }

  .view-home .hero-cta {
    opacity: 0;
    animation: fade-in-up 0.9s ease 0.2s forwards;
  }

  html.fonts-ready .view-downloads .downloads-note {
    opacity: 0;
    animation: fade-in-up 0.9s ease 0.2s forwards;
  }

  .view-downloads .downloads-back-link {
    opacity: 0;
    animation: fade-in-up 0.9s ease 0.2s forwards;
  }

  .menu-card {
    transform-style: preserve-3d;
    transition: transform var(--flip-duration) cubic-bezier(0.2, 0.75, 0.2, 1);
  }

  .menu-panel[data-menu-open="true"] .menu-card {
    transform: rotateX(180deg);
  }

  .menu-card__face--front {
    position: absolute;
    inset: 0;
  }
}

@media (width < 768px) {
  .downloads-nav {
    width: min(30rem, calc(100vw - 2.5rem));
  }
}

@media (width >= 768px) {
  .btn--primary {
    padding: 1.05rem 2rem;
    font-size: var(--font-size-btn-primary);
  }

  :is(.hero-cta, .downloads-back-link) .btn--primary {
    font-size: var(--font-size-accent-wide);
  }

  :is(#site-menu, .downloads-nav) .menu-card__face {
    font-size: var(--font-size-accent-wide);
  }
}

@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}