:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --panel: #f4f5f7;
  --border: #d8dbe0;
  --fg: #16181d;
  --muted: #5c6270;
  --accent: #2f6df6;
  --error: #b3261e;
  --ok: #1d7a45;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101216;
    --panel: #191c22;
    --border: #2b303a;
    --fg: #e7e9ee;
    --muted: #9aa1b1;
    --accent: #7aa2ff;
    --error: #ff8177;
    --ok: #6ddc9b;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 1.25rem 3rem;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

header, main, footer { max-width: 60rem; margin: 0 auto; }

header { padding: 2.5rem 0 1.5rem; }
h1 { margin: 0 0 .3rem; font-size: 1.65rem; letter-spacing: -.01em; }
h2 { margin: 0 0 1rem; font-size: 1.15rem; }
h3 { margin: 1.5rem 0 .5rem; font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
.sub { margin: 0; color: var(--muted); }

section {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1.5rem;
}

/* ---- controls ---- */

.controls { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 1rem; }

button, .file-btn {
  font: inherit;
  font-size: .9rem;
  padding: .45rem .9rem;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
}
button:hover:not(:disabled), .file-btn:hover { border-color: var(--accent); color: var(--accent); }
button:disabled { opacity: .45; cursor: default; }
.file-btn input { display: none; }

/* ---- scan stage ---- */

#stage {
  position: relative;
  width: 100%;
  background: #000;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  min-height: 12rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

#stage video, #stage #preview {
  display: block;
  width: 100%;
  height: auto;
  max-height: 70vh;
  object-fit: contain;
}
#stage video[hidden], #stage #preview[hidden] { display: none; }

#overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

#stage-hint { color: #9aa1b1; font-size: .9rem; padding: 3rem 1rem; margin: 0; text-align: center; }

#scan-status { min-height: 1.4rem; margin: .7rem 0 0; font-size: .9rem; color: var(--muted); }
#scan-status.error { color: var(--error); }

/* ---- results ---- */

.results { list-style: none; margin: 0; padding: 0; display: grid; gap: .5rem; }
.results li {
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: .55rem .7rem;
  background: var(--bg);
  font-size: .9rem;
  overflow-wrap: anywhere;
}
.results li.empty { color: var(--muted); border-style: dashed; }
.results .meta { display: flex; gap: .5rem; align-items: center; color: var(--muted); font-size: .78rem; margin-bottom: .2rem; }
.results .tag {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0 .5rem;
  text-transform: uppercase;
  letter-spacing: .05em;
  font-size: .68rem;
  color: var(--ok);
}
.results .payload { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .85rem; }

/* ---- generate ---- */

.gen-grid { display: grid; grid-template-columns: 1fr 16rem; gap: 1.25rem; align-items: start; }
@media (max-width: 40rem) { .gen-grid { grid-template-columns: 1fr; } }

.gen-input label { display: block; font-size: .8rem; color: var(--muted); margin-bottom: .3rem; }

textarea, select {
  font: inherit;
  width: 100%;
  padding: .5rem .6rem;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  resize: vertical;
}
textarea { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9rem; }

.gen-opts { display: grid; grid-template-columns: 1fr auto; gap: .6rem 1rem; align-items: end; margin-top: .8rem; }
.gen-opts .check { display: flex; align-items: center; gap: .4rem; font-size: .9rem; color: var(--fg); margin: 0 0 .5rem; }
.gen-opts .check input { width: auto; margin: 0; }

.code-frame {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 8rem;
}
.code-frame svg { width: 100%; height: auto; display: block; }
.code-frame:empty::after { content: "—"; color: #999; }

.download { display: inline-block; margin-top: .6rem; font-size: .85rem; color: var(--accent); }
.download-row { display: flex; gap: 1rem; align-items: baseline; flex-wrap: wrap; }
.copy-btn {
  background: none;
  border: none;
  padding: 0;
  font: inherit;
  font-size: .85rem;
  cursor: pointer;
  text-decoration: underline;
}

.error { color: var(--error); font-size: .88rem; margin: .8rem 0 0; }

footer { color: var(--muted); font-size: .82rem; padding-top: .5rem; }