/* Engine CSS: what every theme shares. The reset, the spacing system (the only vertical distances a theme may
 * use, measured by the spacing audit), and the mechanics the engine relies on (hidden, sr-only, lightbox, reveal).
 * Colours and fonts belong to each theme's own theme.css.
 *
 * Spacing system (26 Sept 2026, Arya: "random spacing = AI slop"). Seven roles, five values:
 *   section edge → content   96   (--gap-section; hero and closing may differ, they are full screens)
 *   label → heading          12   (--gap-label; also a field label → its input)
 *   heading → text           24   (--gap-heading)
 *   text → next block        40   (--gap-block; photo, form, map, card list, button row)
 *   items in a list          16   (--gap-item; cards, events, wishes, buttons side by side)
 *   card padding             24   (--gap-card)
 *   page side margin         24   (--gap-side)
 * Lines that belong together (a name and its parents, a number and its holder) are ONE text block with line
 * breaks, never two blocks with a small margin. */
:root {
  --gap-section: 96px;
  --gap-label: 12px;
  --gap-heading: 24px;
  --gap-block: 40px;
  --gap-item: 16px;
  --gap-card: 24px;
  --gap-side: 24px;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; overflow-x: clip; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { -webkit-font-smoothing: antialiased; }
body.is-locked { overflow: hidden; height: 100svh; }
img { display: block; max-width: 100%; }
p, h1, h2, h3, h4, figure, blockquote, ol, ul { margin: 0; }
ol, ul { padding: 0; list-style: none; }
button, input, textarea, select { font: inherit; }
.sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }

/* sections: 96 from every section edge to its content; a section before a band or the footer ends with 96 too */
.sec { padding: var(--gap-section) var(--gap-side) 0; }
.sec-end { padding-bottom: var(--gap-section); }
.sec-band { padding: var(--gap-section) var(--gap-side); }

/* the answer card and a changed state never just blink in */
.rsvp-done:not([hidden]) { animation: done-in 320ms cubic-bezier(0.23, 1, 0.32, 1); }
@keyframes done-in { from { opacity: 0; transform: translateY(6px) scale(0.98); } }
.stepper button { display: grid; place-items: center; }
/* small text links keep a 44 px tall target without moving the layout */
.tap { padding-block: 12px; margin-block: -12px; }
/* the parts the browser draws take the theme's colours (each theme sets --sel) */
::selection { background: var(--sel, rgba(0, 0, 0, 0.14)); color: inherit; }
input, textarea { caret-color: var(--caret, currentColor); }
a { text-underline-offset: 3px; }

/* a text block made of lines that belong together */
.lines > span, .lines > b, .lines > strong { display: block; }

/* scroll reveal: the engine adds .is-in */
.js .reveal { opacity: 0.35; transform: translateY(8px); transition: opacity 700ms cubic-bezier(0.23, 1, 0.32, 1), transform 700ms cubic-bezier(0.23, 1, 0.32, 1); }
.js .reveal.is-in { opacity: 1; transform: none; }

/* lightbox (themes colour it through --lb-* custom properties) */
.lightbox { position: fixed; inset: 0; z-index: 60; display: grid; place-items: center; background: var(--lb-scrim, rgba(10, 10, 10, 0.9)); }
.lightbox:not([hidden]) { animation: lb-in 200ms cubic-bezier(0.23, 1, 0.32, 1); }
.lightbox:not([hidden]) img { animation: lb-img 260ms cubic-bezier(0.23, 1, 0.32, 1); }
@keyframes lb-in { from { opacity: 0; } }
@keyframes lb-img { from { opacity: 0; transform: scale(0.96); } }
.lightbox img { max-width: 92vw; max-height: 84svh; object-fit: contain; border-radius: 6px; }
.lightbox-close, .lightbox-nav {
  position: absolute; display: grid; place-items: center; width: 48px; height: 48px; border-radius: 50%; cursor: pointer; transition: transform 160ms ease-out;
  border: 1px solid var(--lb-line, rgba(255, 255, 255, 0.3)); background: var(--lb-button, rgba(20, 20, 20, 0.7)); color: var(--lb-ink, #fff);
}
.lightbox-close:active, .lightbox-nav:active { transform: scale(0.94); }
.lightbox-close { top: calc(env(safe-area-inset-top) + 14px); right: 14px; }
.lightbox-nav { top: 50%; margin-top: -24px; }
.lightbox-nav.prev { left: 10px; }
.lightbox-nav.next { right: 10px; }

/* music button: position is shared, the look is the theme's */
.music { position: fixed; right: 16px; bottom: calc(env(safe-area-inset-bottom) + 16px); z-index: 30; width: 46px; height: 46px; border-radius: 50%; display: grid; place-items: center; cursor: pointer; }
.music-bars { display: flex; align-items: flex-end; gap: 3px; height: 16px; }
.music-bars i { width: 3px; height: 5px; border-radius: 2px; background: currentColor; }
.music[aria-pressed="true"] .music-bars i { animation: music-bar 1.1s cubic-bezier(0.65, 0, 0.35, 1) infinite alternate; }
.music[aria-pressed="true"] .music-bars i:nth-child(2) { animation-delay: -0.4s; }
.music[aria-pressed="true"] .music-bars i:nth-child(3) { animation-delay: -0.8s; }
@keyframes music-bar { from { height: 4px; } to { height: 16px; } }

/* a demo ribbon: honest about what the visitor is looking at */
.demo-note.is-low { top: auto; left: 16px; bottom: calc(env(safe-area-inset-bottom) + 16px); transform: none; max-width: calc(100% - 96px); }
.demo-note { position: fixed; left: 50%; top: calc(env(safe-area-inset-top) + 10px); z-index: 45; transform: translateX(-50%); display: flex; align-items: center; gap: 12px; padding: 6px 6px 6px 14px; border-radius: 999px; background: rgba(15, 15, 15, 0.78); color: #fff; font: 600 0.72rem/1 system-ui, sans-serif; letter-spacing: 0.02em; white-space: nowrap; -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px); }
.demo-note a { padding: 7px 12px; border-radius: 999px; background: #fff; color: #111; text-decoration: none; }
.demo-note a:hover { background: #eee; }

/* ---------- the kit: shared controls for themes that opt in with [data-kit] ----------
   A theme recolours them with --k-* and keeps its own look everywhere else. Every distance is a --gap-* token. */
[data-kit] {
  --k-ink: #222; --k-soft: #666; --k-line: #ddd; --k-card: #fff; --k-accent: #222; --k-on-accent: #fff;
  --k-accent-hover: #444; --k-focus: #222; --k-success: #3f6b3a; --k-danger: #a3272e;
  --k-radius: 12px; --k-radius-card: 16px; --k-display: Georgia, serif; --k-body: system-ui, sans-serif;
}
[data-kit] :focus-visible { outline: 2px solid var(--k-focus); outline-offset: 3px; }
[data-kit] .btn {
  display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 24px;
  border-radius: var(--k-radius-btn, 999px); border: 1px solid transparent; font: 600 0.9rem/1 var(--k-body); letter-spacing: 0.02em;
  white-space: nowrap; text-decoration: none; cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease, transform 160ms ease;
}
[data-kit] .btn:active { transform: scale(0.98); }
[data-kit] .btn:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }
[data-kit] .btn-main { background: var(--k-accent); color: var(--k-on-accent); }
@media (hover: hover) { [data-kit] .btn-main:hover { background: var(--k-accent-hover); } }
[data-kit] .btn-ghost { background: transparent; color: var(--k-ink); border-color: var(--k-line); }
@media (hover: hover) { [data-kit] .btn-ghost:hover { border-color: var(--k-ink); } }
[data-kit] .btn-block { width: 100%; }
[data-kit] .btn[data-state="loading"] { opacity: 0.75; cursor: progress; }
[data-kit] .btn[data-state="success"] { background: var(--k-success); color: #fff; border-color: transparent; }
[data-kit] .btn[data-state="error"] { background: var(--k-danger); color: #fff; border-color: transparent; }
[data-kit] .link-btn { padding: 0; border: 0; background: none; color: inherit; font: 600 0.86rem/1.5 var(--k-body); text-decoration: underline; text-underline-offset: 4px; cursor: pointer; }
[data-kit] .row { display: flex; flex-wrap: wrap; gap: var(--gap-item); }

[data-kit] .form { margin-top: var(--gap-block); display: grid; gap: var(--gap-heading); }
[data-kit] .answer { margin: 0; padding: 0; border: 0; min-width: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--gap-item); }
[data-kit] .answer-tile { position: relative; }
[data-kit] .answer-tile input { position: absolute; opacity: 0; width: 1px; height: 1px; }
[data-kit] .answer-tile span {
  display: grid; gap: var(--gap-label); height: 100%; padding: var(--gap-card); cursor: pointer; color: var(--k-ink);
  border: 1px solid var(--k-line); border-radius: var(--k-radius-card); background: var(--k-card);
  transition: background-color 160ms ease, border-color 160ms ease, transform 160ms ease;
}
[data-kit] .answer-tile b { font-family: var(--k-display); font-weight: var(--k-display-weight, 600); font-size: 1.5rem; line-height: 1; white-space: nowrap; }
[data-kit] .answer-tile small { font-size: 0.76rem; line-height: 1.35; color: var(--k-soft); }
[data-kit] .answer-tile span:hover { border-color: var(--k-ink); }
[data-kit] .answer-tile span:active { transform: scale(0.98); }
[data-kit] .answer-tile input:checked + span { background: var(--k-accent); border-color: var(--k-accent); color: var(--k-on-accent); }
[data-kit] .answer-tile input:checked + span small { color: inherit; opacity: 0.8; }
[data-kit] .answer-tile input:focus-visible + span { outline: 2px solid var(--k-focus); outline-offset: 2px; }
[data-kit] .field { display: grid; gap: var(--gap-label); margin: 0; padding: 0; border: 0; min-width: 0; }
[data-kit] .field-label { font: 600 0.8rem/1.4 var(--k-body); color: var(--k-soft); }
[data-kit] .field-opt { font-weight: 400; }
[data-kit] .field input, [data-kit] .field textarea {
  width: 100%; font: 400 1rem/1.5 var(--k-body); color: var(--k-ink); background: var(--k-card);
  border: 1px solid var(--k-line); border-radius: var(--k-radius); padding: 0.8rem 0.9rem; transition: border-color 160ms ease;
}
[data-kit] .field textarea { resize: vertical; min-height: 110px; }
[data-kit] .field input:hover, [data-kit] .field textarea:hover { border-color: var(--k-soft); }
[data-kit] .field input:focus, [data-kit] .field textarea:focus { border-color: var(--k-ink); outline: none; }
[data-kit] .field input:focus-visible, [data-kit] .field textarea:focus-visible { outline: 2px solid var(--k-focus); outline-offset: 1px; }
[data-kit] .field input[aria-invalid="true"] { border-color: var(--k-danger); }
[data-kit] .field-error { font: 400 0.8rem/1.4 var(--k-body); color: var(--k-danger); }
[data-kit] .field-count { justify-self: end; font: 400 0.72rem/1.4 var(--k-body); color: var(--k-soft); font-variant-numeric: tabular-nums; }
[data-kit] .stepper { display: inline-grid; grid-template-columns: 48px 56px 48px; align-items: center; justify-self: start; border: 1px solid var(--k-line); border-radius: 999px; background: var(--k-card); color: var(--k-ink); }
[data-kit] .stepper button { height: 48px; border: 0; background: transparent; color: inherit; font-size: 1.3rem; cursor: pointer; border-radius: 999px; }
[data-kit] .stepper button:hover { background: rgba(0, 0, 0, 0.05); }
[data-kit] .stepper button:disabled { opacity: 0.3; cursor: not-allowed; background: transparent; }
[data-kit] .stepper output { text-align: center; font-family: var(--k-display); font-size: 1.5rem; font-variant-numeric: lining-nums tabular-nums; }
[data-kit] .form-end { display: grid; gap: var(--gap-item); }
[data-kit] .form-status { font: 400 0.88rem/1.5 var(--k-body); }
[data-kit] .form-status[data-state="error"] { color: var(--k-danger); }
[data-kit] .rsvp-done { margin-top: var(--gap-block); display: grid; gap: var(--gap-item); justify-items: start; padding: var(--gap-card); border-radius: var(--k-radius-card); background: var(--k-accent); color: var(--k-on-accent); }
[data-kit] .rsvp-done-main { font-family: var(--k-display); font-size: 1.45rem; line-height: 1.25; }
[data-kit] [data-rsvp-by]:empty { display: none; }

[data-kit] .wish-feature { margin-top: var(--gap-heading); }
[data-kit] .wish-feature blockquote::before { content: "\201C"; display: block; height: 0.5em; font: 400 3.4rem/1 var(--k-display); color: var(--k-accent); }
[data-kit] .wish-feature blockquote { font-family: var(--k-display); font-size: 1.45rem; line-height: 1.35; color: var(--k-ink); overflow-wrap: anywhere; white-space: pre-wrap; }
[data-kit] .wish-feature figcaption { margin-top: var(--gap-label); font: 400 0.8rem/1.4 var(--k-body); color: var(--k-soft); }
[data-kit] .wish-list { margin-top: var(--gap-block); display: grid; gap: var(--gap-item); }
[data-kit] .wish-list:empty { display: none; }
[data-kit] .wish { padding-top: var(--gap-item); border-top: 1px solid var(--k-line); }
[data-kit] .wish.is-new { animation: kit-wish-in 900ms cubic-bezier(0.22, 1, 0.36, 1); }
@keyframes kit-wish-in { from { opacity: 0; transform: translateY(-8px); } }
[data-kit] .wish-head { display: flex; justify-content: space-between; align-items: baseline; gap: var(--gap-label); }
[data-kit] .wish-name { font: 600 0.9rem/1.4 var(--k-body); color: var(--k-ink); overflow-wrap: anywhere; min-width: 0; }
[data-kit] .wish-time { flex: none; font: 400 0.72rem/1.4 var(--k-body); color: var(--k-soft); }
[data-kit] .wish-msg { margin-top: var(--gap-label); font: 400 0.92rem/1.65 var(--k-body); color: var(--k-ink); white-space: pre-wrap; overflow-wrap: anywhere; }
[data-kit] .wishes-empty { margin-top: var(--gap-heading); font: 400 0.92rem/1.6 var(--k-body); color: var(--k-soft); }
[data-kit] #wishes-more { margin-top: var(--gap-block); }

[data-kit] .map { margin-top: var(--gap-block); aspect-ratio: 4 / 3; border-radius: var(--k-radius-card); overflow: hidden; display: grid; place-items: center; border: 1px solid var(--k-line); background: var(--k-card); }
[data-kit] .map iframe { width: 100%; height: 100%; border: 0; }
[data-kit] .map-load { min-height: 44px; padding: 0 24px; border-radius: 999px; border: 1px solid var(--k-line); background: transparent; color: var(--k-ink); font: 600 0.875rem/1 var(--k-body); cursor: pointer; white-space: nowrap; }
[data-kit] .map-load:hover { border-color: var(--k-ink); }
[data-kit] .g-item { display: block; padding: 0; border: 0; overflow: hidden; cursor: zoom-in; background: var(--k-line); }
[data-kit] .g-item img { width: 100%; height: 100%; object-fit: cover; }

@media (max-width: 359px) {
  [data-kit] .answer-tile span { padding: var(--gap-item); }
  [data-kit] .answer-tile b { font-size: 1.25rem; }
}

/* ---------- layouts (engine/layout.js) ---------- */
html.lay-snap { scroll-snap-type: y proximity; }
[data-layout="snap"] [data-page] { scroll-snap-align: start; min-height: 100svh; }
html.lay-pages body, html.lay-stories body, html.lay-tabs body { overflow: hidden; height: 100svh; overscroll-behavior: none; }
[data-layout="pages"] [data-deck], [data-layout="stories"] [data-deck], [data-layout="tabs"] [data-deck] { position: fixed; inset: 0; overflow: hidden; touch-action: pan-y; }
[data-layout="pages"] [data-page], [data-layout="stories"] [data-page], [data-layout="tabs"] [data-page] { position: absolute; inset: 0; overflow-x: hidden; overflow-y: auto; overscroll-behavior: contain; -webkit-overflow-scrolling: touch; }
[data-page]:focus { outline: none; }
/* inside a page, reveals follow each other (the layout sets --i) */
[data-layout="pages"] .reveal, [data-layout="stories"] .reveal, [data-layout="tabs"] .reveal { transition-delay: calc(var(--i, 0) * 70ms); }
[data-layout="pages"] [data-page]:not(.is-current) .reveal, [data-layout="stories"] [data-page]:not(.is-current) .reveal, [data-layout="tabs"] [data-page]:not(.is-current) .reveal { transition: none; }
/* stories: one bar per slide; the current one fills over its time, or at once when it waits for the guest */
[data-bars] { display: flex; gap: 4px; }
[data-bars] i { flex: 1; height: 2px; border-radius: 2px; background: var(--bar-track, rgba(255, 255, 255, 0.35)); overflow: hidden; }
[data-bars] b { display: block; height: 100%; width: 100%; background: var(--bar-fill, #fff); transform: scaleX(0); transform-origin: left; }
[data-bars] i.is-done b, [data-bars] i.is-now:not(.is-auto) b { transform: none; }
[data-bars] i.is-now.is-auto b { animation: bar-fill var(--dur) linear forwards; }
.is-paused [data-bars] i.is-now.is-auto b { animation-play-state: paused; }
@keyframes bar-fill { to { transform: none; } }

/* the song's name, once, beside the music button */
.music-song { position: fixed; right: 72px; bottom: calc(env(safe-area-inset-bottom) + 24px); z-index: 30; max-width: calc(100% - 96px); padding: 8px 14px; border-radius: 999px; background: var(--song-bg, rgba(15, 15, 15, 0.78)); color: var(--song-ink, #fff); font: 500 0.75rem/1.2 system-ui, sans-serif; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; transition: opacity 500ms ease, transform 500ms cubic-bezier(0.23, 1, 0.32, 1); animation: song-in 500ms cubic-bezier(0.23, 1, 0.32, 1); pointer-events: none; }
.music-song.is-gone { opacity: 0; transform: translateX(8px); }
@keyframes song-in { from { opacity: 0; transform: translateX(8px); } }
@media (min-width: 960px) { .music-song { right: 80px; bottom: 32px; } }

@media (min-width: 960px) { .music { right: 24px; bottom: 24px; } }
@media (max-width: 379px) { .demo-note.is-low span { display: none; } .demo-note.is-low { padding-left: 6px; } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { transform: none; transition: opacity 150ms linear; }
  .rsvp-done:not([hidden]), .lightbox:not([hidden]) img { animation-name: lb-in; }
  .music[aria-pressed="true"] .music-bars i { animation: none; height: 10px; }
}