/* ============================================================
   Slide-over checklist drawer + scroll-jump FAB.
   The drawer lives at the viewport's right edge with a tab handle
   sticking out on its left side. Closed by default; the tab click
   toggles it. checklist.js auto-opens it whenever an item flips
   from incomplete → complete (unless the user manually closed it).

   The scroll-jump button is a sibling FAB next to the copy-to-
   clipboard button. It uses an IntersectionObserver on the
   generated rust block to flip its chevron direction: down when
   the rust block is off-screen (click → jump to it), up when it's
   in view (click → jump back to the last selected flag's <dt>).
   ============================================================ */

:root {
  --checklist-w: 22rem;
  --checklist-tab-w: 2.4rem;
  --checklist-z: 900;          /* below topbar (1000) */
  --fab-size: 2.6rem;
  --fab-gap: 0.6rem;
}

/* ----- drawer --------------------------------------------------------- */
.checklist-drawer {
  position: fixed;
  top: 6rem;
  bottom: 6rem;
  right: 0;
  width: var(--checklist-w);
  max-width: calc(100vw - 2rem);
  display: flex;
  align-items: stretch;
  z-index: var(--checklist-z);
  pointer-events: none;        /* handled per-child */

  /* Closed: drawer body is shifted off-screen by its own width minus the
     tab so only the tab sticks out. Open: translate(0). */
  transform: translateX(calc(100% - var(--checklist-tab-w)));
  transition: transform 280ms cubic-bezier(0.2, 0.7, 0.25, 1);
}
.checklist-drawer.is-open { transform: translateX(0); }

.checklist-tab,
.checklist-body { pointer-events: auto; }

/* ----- tab handle (left edge of drawer) ------------------------------- */
.checklist-tab {
  position: absolute;
  top: 0;
  left: 0;
  width: var(--checklist-tab-w);
  height: 100%;
  background: var(--primary, #be6e34);
  color: var(--white, #fff);
  border: none;
  border-radius: 8px 0 0 8px;
  box-shadow: -2px 0 8px rgba(0, 0, 0, 0.15);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 0;
  font-family: inherit;
  transition: background 150ms ease;
}
.checklist-tab:hover { background: var(--primary-dark, #6d2c0f); }
.checklist-tab i { font-size: 1.05rem; }
.checklist-tab .tab-label {
  /* Vertical text — rotated, monospace, small. */
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  white-space: nowrap;
}
.checklist-tab .tab-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.4rem;
  height: 1.4rem;
  padding: 0 0.35rem;
  background: var(--white, #fff);
  color: var(--primary-dark, #6d2c0f);
  border-radius: 1rem;
  font-size: 0.7rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.checklist-tab .tab-badge[data-progress="0"] { display: none; }

/* ----- drawer body --------------------------------------------------- */
.checklist-body {
  flex: 1 1 auto;
  margin-left: var(--checklist-tab-w);
  background: var(--bg, #fafaf8);
  color: var(--text, #2d2d2d);
  border: 1px solid var(--border, #e0dcd4);
  border-right: none;
  border-radius: 8px 0 0 8px;
  box-shadow: -4px 6px 18px rgba(0, 0, 0, 0.18);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.checklist-body header {
  padding: 0.85rem 1rem 0.65rem;
  border-bottom: 1px solid var(--border, #e0dcd4);
}
.checklist-body header h3 {
  margin: 0;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary-dark, #6d2c0f);
  letter-spacing: 0.5px;
}
.checklist-body header .checklist-summary {
  margin: 0.2rem 0 0;
  font-size: 0.75rem;
  color: var(--text-light, #555);
}

.checklist {
  list-style: none;
  margin: 0;
  padding: 0.5rem 0.5rem 0.85rem;
  overflow-y: auto;
  flex: 1 1 auto;
}

.checklist-item {
  display: grid;
  grid-template-columns: 1.5rem 1fr;
  grid-template-rows: auto auto;
  gap: 0.15rem 0.5rem;
  align-items: start;
  padding: 0.6rem 0.6rem;
  border-radius: 4px;
  transition: background 200ms ease;
}

.checklist-item .checklist-mark {
  grid-column: 1;
  grid-row: 1 / span 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  font-size: 1rem;
  color: var(--text-light, #888);
  transition: color 200ms ease;
}

/* Heading-as-button: the mark + label become a single clickable target.
   Reset native button chrome and re-flow the children into the same grid
   cells the static span layout uses. */
.checklist-item .checklist-jump {
  grid-column: 1 / span 2;
  grid-row: 1;
  display: grid;
  grid-template-columns: 1.5rem 1fr;
  align-items: center;
  gap: 0 0.5rem;
  background: transparent;
  border: 0;
  padding: 0;
  margin: 0;
  font: inherit;
  color: inherit;
  text-align: left;
  cursor: pointer;
  border-radius: 4px;
  transition: color 150ms ease;
}
.checklist-item .checklist-jump .checklist-mark {
  grid-column: 1;
  grid-row: 1;
}
.checklist-item .checklist-jump .checklist-text {
  grid-column: 2;
  grid-row: 1;
}
.checklist-item .checklist-jump:hover .checklist-text {
  color: var(--primary, #be6e34);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}
.checklist-item .checklist-jump:focus-visible {
  outline: 2px solid var(--primary, #be6e34);
  outline-offset: 2px;
}
.checklist-item.is-done .checklist-jump:hover .checklist-text {
  text-decoration: line-through underline;
  text-decoration-color: var(--primary, #be6e34);
}

.checklist-item.is-done .checklist-mark { color: #1f9d55; }      /* green */

.checklist-item .checklist-text {
  grid-column: 2;
  grid-row: 1;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text, #2d2d2d);
  transition: color 200ms ease, text-decoration-color 200ms ease;
}
.checklist-item.is-done .checklist-text {
  color: var(--text-light, #888);
  text-decoration: line-through;
  text-decoration-color: rgba(0, 0, 0, 0.25);
}

.checklist-item .checklist-detail {
  grid-column: 2;
  grid-row: 2;
  font-size: 0.75rem;
  color: var(--text-light, #888);
  line-height: 1.4;
}
.checklist-item .checklist-detail code {
  background: var(--code-bg, #f0ede8);
  padding: 0.05rem 0.3rem;
  border-radius: 3px;
  font-size: 0.75rem;
}

/* Pulse highlight on the item that just transitioned to done. */
.checklist-item.just-completed {
  background: color-mix(in srgb, #1f9d55 16%, transparent);
  animation: just-completed-pulse 2.5s ease-out;
}
@keyframes just-completed-pulse {
  0%   { background: color-mix(in srgb, #1f9d55 35%, transparent); }
  100% { background: color-mix(in srgb, #1f9d55  0%, transparent); }
}

/* Brief glow on a flag row the checklist just jumped to, so the user sees
   where they landed. Outside the drawer, applied by checklist.js. */
dl.flags dt.flag-row.checklist-flash {
  animation: checklist-flag-flash 1.6s ease-out;
}
@keyframes checklist-flag-flash {
  0%   { background: color-mix(in srgb, var(--primary, #be6e34) 28%, transparent); }
  100% { background: transparent; }
}

/* ----- dark theme ---------------------------------------------------- */
[data-theme="dark"] .checklist-body {
  background: #1a1a1a;
  color: var(--text);
  border-color: #3a3a3a;
  box-shadow: -4px 6px 18px rgba(0, 0, 0, 0.55);
}
[data-theme="dark"] .checklist-item.is-done .checklist-mark { color: #58c97a; }
[data-theme="dark"] .checklist-item.just-completed {
  background: color-mix(in srgb, #58c97a 22%, transparent);
}

/* ----- mobile -------------------------------------------------------- */
@media (max-width: 700px) {
  .checklist-drawer {
    --checklist-w: 88vw;
    top: 5rem;
    bottom: 5rem;
  }
}

/* ============================================================
   Scroll-jump FAB — sibling of the copy-floating button.
   Same .is-active gate as copy-floating; cli.js toggles both
   together when prog.count > 0.
   ============================================================ */
.scroll-jump-floating {
  position: fixed;
  /* Match copy-floating: lift above iOS Safari's bottom URL bar via
     safe-area-inset-bottom. The right offset stacks this FAB to the
     left of copy-floating, so we feed the same inset into the calc. */
  bottom: max(1rem, env(safe-area-inset-bottom, 1rem));
  right: calc(max(1rem, env(safe-area-inset-right, 1rem)) + var(--fab-size) + var(--fab-gap));
  width: var(--fab-size);
  height: var(--fab-size);
  border-radius: 50%;
  background: var(--code-bg);
  border: 1px solid var(--border);
  color: var(--text);
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.18);
  transition: background 120ms ease, color 120ms ease, transform 120ms ease,
              box-shadow 120ms ease;
  z-index: 50;
  padding: 0;
}
.scroll-jump-floating.is-active { display: inline-flex; }

.scroll-jump-floating:hover {
  background: var(--primary);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.22);
}
.scroll-jump-floating:active {
  transform: translateY(0);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}
.scroll-jump-floating:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* The chevron icon flips via CSS based on a class the JS toggles. */
.scroll-jump-floating .fa-chevron-down,
.scroll-jump-floating .fa-chevron-up {
  font-size: 0.95rem;
  transition: transform 200ms ease;
}

@media (prefers-reduced-motion: reduce) {
  .checklist-drawer,
  .checklist-item.just-completed,
  .scroll-jump-floating,
  .scroll-jump-floating .fa-chevron-down,
  .scroll-jump-floating .fa-chevron-up {
    transition: none;
    animation: none;
  }
}