:root {
  --bg: #f6f3ee;
  --surface: #ffffff;
  --text: #1d1a16;
  --muted: #6d665c;
  --border: #e2dcd2;
  --accent: #b4442c;
  --accent-text: #ffffff;
  --danger-bg: #fbe9e5;
  --danger: #8f2a17;
  --radius: 12px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16130f;
    --surface: #221e19;
    --text: #f1ece4;
    --muted: #a59d90;
    --border: #3a342c;
    --accent: #e0674b;
    --accent-text: #16130f;
    --danger-bg: #3d1d16;
    --danger: #ffb4a3;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
img { max-width: 100%; display: block; }
h2 { font-size: 1.15rem; margin: 0 0 .25rem; display: flex; align-items: center; gap: .5rem; }
.muted { color: var(--muted); margin: 0 0 .75rem; font-size: .92rem; }
.error-text { color: var(--danger); }

/* layout */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; justify-content: space-between; align-items: center;
  padding: .6rem 16px; padding-top: max(.6rem, env(safe-area-inset-top));
  background: var(--bg); border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; letter-spacing: .02em; }
.topbar nav { display: flex; gap: .25rem; align-items: center; }
.topbar form { margin: 0; }
main { max-width: 760px; margin: 0 auto; padding: 12px 16px 80px; }
.step {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px; margin: 12px 0;
}
.num {
  display: inline-grid; place-items: center; width: 1.6rem; height: 1.6rem; border-radius: 50%;
  background: var(--text); color: var(--bg); font-size: .85rem;
}
.row { display: flex; gap: .5rem; flex-wrap: wrap; align-items: center; }
.two-col { display: grid; grid-template-columns: 1fr; gap: 0 .75rem; }
@media (min-width: 560px) { .two-col { grid-template-columns: 1fr 1fr; } }

/* controls */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  min-height: 44px; padding: .55rem 1rem; border-radius: 10px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  font: inherit; font-weight: 600; cursor: pointer; text-decoration: none;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn.small { min-height: 36px; padding: .35rem .7rem; font-size: .88rem; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.busy { pointer-events: none; opacity: .75; }
.btn.busy::before {
  content: ""; width: 1em; height: 1em; border-radius: 50%;
  border: 2px solid currentColor; border-right-color: transparent; animation: spin .8s linear infinite;
}
.link { background: none; border: 0; color: var(--text); font: inherit; padding: .5rem; cursor: pointer; }
.field { display: block; margin: 0 0 .75rem; }
.field > span { display: block; font-size: .85rem; font-weight: 600; margin-bottom: .25rem; }
input, textarea, select {
  width: 100%; font: inherit; color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 8px; padding: .55rem .65rem;
}
textarea { resize: vertical; }
.segmented { display: inline-flex; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
.segmented button {
  font: inherit; border: 0; background: var(--surface); color: var(--text);
  padding: .55rem 1rem; min-height: 44px; cursor: pointer;
}
.segmented button + button { border-left: 1px solid var(--border); }
.segmented button.on { background: var(--text); color: var(--bg); }
.segmented.small button { min-height: 36px; padding: .35rem .8rem; font-size: .88rem; }

/* references */
.thumbs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-bottom: .75rem; }
.thumbs:empty { display: none; }
.thumb { position: relative; aspect-ratio: 1; border-radius: 8px; overflow: hidden; background: var(--bg); }
.thumb img { width: 100%; height: 100%; object-fit: cover; }
.thumb button {
  position: absolute; top: 4px; right: 4px; width: 28px; height: 28px; border-radius: 50%;
  border: 0; background: rgba(0,0,0,.65); color: #fff; font-size: 1rem; cursor: pointer;
}
#ref-add-label { margin-bottom: .75rem; }

/* concept + image cards */
.cards { display: grid; gap: 10px; margin: .75rem 0; }
.cards:empty { display: none; }
@media (min-width: 560px) { .cards { grid-template-columns: 1fr 1fr; } }
.card {
  border: 1px solid var(--border); border-radius: 10px; background: var(--surface); overflow: hidden;
}
.concept { padding: 12px; display: flex; flex-direction: column; gap: .5rem; }
.concept.selected { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.concept h3 { margin: 0; font-size: 1rem; }
.concept p { margin: 0; font-size: .93rem; }
.concept .pick { display: flex; align-items: center; gap: .5rem; font-weight: 600; font-size: .9rem; }
.concept .pick input { width: 1.2rem; height: 1.2rem; }
.concept form { display: grid; gap: .5rem; }
.img-wrap { background: #fff; position: relative; }
.img-wrap img { width: 100%; cursor: zoom-in; }
.card-body { padding: 10px 12px 12px; display: grid; gap: .4rem; }
.card-title { font-weight: 600; }
.card-sub { font-size: .85rem; margin: 0; }
.tweak-form { display: flex; gap: .5rem; }
.tweak-form input { flex: 1; }

/* loading placeholder */
.pending .img-wrap {
  aspect-ratio: 1; display: grid; place-items: center; text-align: center; padding: 1rem;
  background: linear-gradient(100deg, var(--bg) 30%, var(--border) 50%, var(--bg) 70%);
  background-size: 300% 100%; animation: shimmer 1.6s linear infinite; color: var(--muted);
}
.pending .elapsed { font-variant-numeric: tabular-nums; }
.inline-loading { display: flex; gap: .6rem; align-items: center; color: var(--muted); padding: .5rem 0; }
.inline-loading::before {
  content: ""; width: 1.1em; height: 1.1em; border-radius: 50%;
  border: 2px solid currentColor; border-right-color: transparent; animation: spin .8s linear infinite;
}

/* mockup step */
.picker { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 4px; }
.picker button {
  flex: 0 0 84px; height: 84px; padding: 0; border-radius: 8px; overflow: hidden;
  border: 2px solid var(--border); background: #fff; cursor: pointer;
}
.picker button.on { border-color: var(--accent); }
.picker img { width: 100%; height: 100%; object-fit: contain; }
.body-photo-row { display: flex; gap: .75rem; align-items: center; }
#body-preview { width: 84px; height: 84px; object-fit: cover; border-radius: 8px; }

/* gallery */
.gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; margin-top: .75rem; }
@media (min-width: 560px) { .gallery { grid-template-columns: repeat(3, 1fr); } }
.gallery figure { margin: 0; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; background: var(--surface); }
.gallery img { width: 100%; aspect-ratio: 1; object-fit: cover; background: #fff; cursor: zoom-in; }
.gallery figcaption { display: flex; justify-content: space-between; align-items: center; gap: .25rem; padding: .35rem .5rem; font-size: .8rem; }
.gallery figcaption a { color: var(--accent); font-weight: 600; text-decoration: none; padding: .25rem; }
.past-sessions { margin-top: 1rem; font-size: .92rem; }
.past-sessions ul { padding-left: 1.1rem; }
.past-sessions button { background: none; border: 0; color: var(--accent); font: inherit; cursor: pointer; padding: .25rem 0; text-align: left; }

/* toast + lightbox */
.toast {
  position: fixed; left: 16px; right: 16px; bottom: max(16px, env(safe-area-inset-bottom)); z-index: 20;
  max-width: 600px; margin: 0 auto; padding: .8rem 1rem; border-radius: 10px;
  background: var(--danger-bg); color: var(--danger); border: 1px solid var(--danger);
  box-shadow: 0 6px 24px rgba(0,0,0,.2);
}
dialog#lightbox {
  border: 0; padding: 12px; border-radius: var(--radius); background: var(--surface); color: var(--text);
  max-width: min(96vw, 900px); max-height: 94vh;
}
dialog#lightbox::backdrop { background: rgba(0,0,0,.75); }
#lightbox-img { max-height: 78vh; margin: 0 auto 10px; background: #fff; }

/* login */
.login-page { display: grid; place-items: center; min-height: 100vh; padding: 16px; }
.login-card {
  width: 100%; max-width: 360px; display: grid; gap: .75rem;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px;
}
.login-card h1 { margin: 0; font-size: 1.4rem; }

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes shimmer { to { background-position: -300% 0; } }