/* Mobile-first. The QR is the point of the page, so it gets the width and
   everything else gets out of its way.

   One hard rule: the QR card is ALWAYS black-on-white, in every colour scheme.
   A dark-mode-inverted QR is unscannable, and the quiet zone has to be real
   white pixels sitting on real white background or it gets visually clipped. */

:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #14181d;
  --muted: #5c6672;
  --line: #dfe3e8;
  --accent: #1a56db;
  --accent-text: #ffffff;
  --btn2-bg: #e5ebf6;
  --btn2-text: #1b2d4d;
  --warn-bg: #fff4e5;
  --warn-line: #f0b429;
  --warn-text: #6b4708;
  --radius: 12px;
  --pad: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161b;
    --surface: #1a1f26;
    --text: #e8ecf1;
    --muted: #97a3b0;
    --line: #2c343d;
    --accent: #5b8def;
    --accent-text: #0b1017;
    --btn2-bg: #262f3d;
    --btn2-text: #dbe5f4;
    --warn-bg: #3a2c0c;
    --warn-line: #b9821a;
    --warn-text: #ffd88a;
  }
}

* { box-sizing: border-box; }

/* The `hidden` attribute must actually hide things.
   The UA stylesheet's `[hidden] { display: none }` lives in the user-agent
   origin, so ANY author-origin `display` declaration beats it regardless of
   specificity — and .gate/.sheet/.fs/.chooser all set `display: flex`. Without
   this rule the fullscreen overlay (fixed, inset 0, white, z-index 80) renders
   permanently over the page as a blank white screen. */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  overflow-x: hidden;
}

body { padding-bottom: env(safe-area-inset-bottom); }

.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .85em; }

h1, h2, h3 { line-height: 1.25; margin: 0; }

/* --- persistent banner / site title -------------------------------------- */
.banner {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 7px var(--pad);
  background: var(--warn-bg);
  border-bottom: 1px solid var(--warn-line);
  color: var(--warn-text);
  font-size: .8rem;
}
.banner-home {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: none;
  background: none;
  border: 0;
  padding: 3px 0;
  color: inherit;
  font: inherit;
  cursor: pointer;
  min-height: 32px;
}
/* The pill logo stands in for the word "SeedSigner". It's ~3:1, so height
   drives the size and width follows. */
.banner-logo { display: block; height: 22px; width: auto; flex: none; }
.banner-title { font-weight: 700; letter-spacing: .01em; }
/* Wraps rather than truncates: an ellipsised warning ("...real fu") is worse
   than a banner one line taller on a narrow phone. */
.banner-text {
  display: flex;
  align-items: center;
  gap: 5px;
  text-align: right;
  font-weight: 600;
}
.banner-warn { font-size: 1rem; line-height: 1; flex: none; }

/* --- layout -------------------------------------------------------------- */
main { max-width: 40rem; margin: 0 auto; padding: var(--pad); }

.scenario-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 4px 0 14px;
}
.scenario-head-text { flex: 1; min-width: 0; }
.scenario-head h1 { font-size: 1rem; font-weight: 600; }
.scenario-head p { margin: 5px 0 0; color: var(--muted); font-size: .95rem; }

/* --- landing page activities --------------------------------------------- */
/* Real buttons, not selectable cards: big, filled, thumb-sized, title only. */
.activities { display: grid; gap: 12px; margin-top: 18px; }
.activity {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  text-align: center;
  border: 0;
  border-radius: var(--radius);
  background: var(--btn2-bg);
  color: var(--btn2-text);
  font-size: 1.15rem;
  font-weight: 600;
  padding: 20px 16px;
  min-height: 66px;
  cursor: pointer;
}
.activity-lead {
  background: var(--accent);
  color: var(--accent-text);
  font-size: 1.3rem;
  min-height: 82px;
}

.view-title { font-size: 1.3rem; margin-bottom: 10px; }
.view-intro { color: var(--muted); margin: 0 0 14px; }
.view-intro-warn {
  border-left: 4px solid var(--warn-line);
  background: var(--warn-bg);
  color: var(--warn-text);
  font-weight: 600;
  padding: 13px 15px;
  margin: 0;
  border-radius: 0 8px 8px 0;
}

/* Sticky banner would otherwise cover a scrolled-to heading. */
.step { margin-bottom: 8px; scroll-margin-top: 56px; }
/* Everything is on one scrolling page now, so each step gets a hard divider —
   that boundary is what tells you where the next thing to do starts. */
.step + .step {
  border-top: 2px solid var(--line);
  padding-top: 26px;
  margin-top: 26px;
}
/* The step name is the instruction — it should read as a callout, not a label. */
.step-title {
  font-size: 1.45rem;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.step-num {
  display: inline-grid;
  place-items: center;
  width: 1.5em; height: 1.5em;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-text);
  font-size: .95rem;
  font-weight: 700;
  flex: none;
}
.step-hint { color: var(--muted); margin: 6px 0 14px; }
.sub { font-size: .95rem; margin: 20px 0 8px; color: var(--muted); }

/* --- the QR itself ------------------------------------------------------- */
.qr-stage { margin-bottom: 14px; }

/* Always white, never themed. The padding is the *visual* margin; the module
   quiet zone is drawn inside the canvas itself. */
.qr-card {
  background: #ffffff;
  border-radius: var(--radius);
  padding: 8px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
}
.qr-card canvas {
  display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  max-width: 100%;
}

.qr-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-top: 8px;
  font-size: .95rem;
  color: var(--muted);
}
.qr-note { font-size: .9rem; color: var(--muted); margin: 6px 0 12px; }

/* --- controls ------------------------------------------------------------ */
.controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 8px;
}
.control-wide { grid-column: 1 / -1; }
.control label {
  display: flex;
  justify-content: space-between;
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--muted);
  margin-bottom: 6px;
}

.segmented {
  display: flex;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--surface);
}
.segmented button {
  flex: 1;
  padding: 10px 6px;
  border: 0;
  background: transparent;
  color: var(--text);
  font-size: .92rem;
  cursor: pointer;
  min-height: 42px;
}
.segmented button + button { border-left: 1px solid var(--line); }
.segmented button[aria-pressed="true"] { background: var(--accent); color: var(--accent-text); font-weight: 600; }

input[type="range"] { width: 100%; height: 40px; accent-color: var(--accent); }

.btn {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: .9rem;
  cursor: pointer;
  min-height: 40px;
}
.btn-block { width: 100%; }
.btn-primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); font-weight: 600; }
.btn-ghost { flex: none; }
.btn-tiny { padding: 5px 10px; font-size: .78rem; min-height: 0; }
.btn:disabled { opacity: .45; cursor: default; }

/* --- details / tables ---------------------------------------------------- */
.details {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  padding: 0 12px;
  margin-top: 12px;
}
.details summary { padding: 13px 0; cursor: pointer; }
.details > div { padding-bottom: 12px; }

.kv { width: 100%; border-collapse: collapse; font-size: .95rem; }
.kv th, .kv td { text-align: left; padding: 6px 0; border-top: 1px solid var(--line); vertical-align: top; }
.kv th { color: var(--muted); font-weight: 500; white-space: nowrap; padding-right: 10px; }
.kv td.num { text-align: right; font-family: ui-monospace, monospace; white-space: nowrap; }
.addr { font-family: ui-monospace, monospace; font-size: .85rem; word-break: break-all; }

.pill {
  display: inline-block;
  font-size: .7rem;
  padding: 2px 7px;
  border-radius: 99px;
  border: 1px solid var(--line);
  color: var(--muted);
  margin-right: 4px;
}
.pill-change { border-color: var(--accent); color: var(--accent); }
.pill-external { border-color: var(--warn-line); color: var(--warn-text); background: var(--warn-bg); }

.words { display: grid; grid-template-columns: repeat(3, 1fr); gap: 5px 10px; font-size: .95rem; }
.words span { font-family: ui-monospace, monospace; }
.words i { color: var(--muted); font-style: normal; width: 1.6em; display: inline-block; }

/* --- choosers ------------------------------------------------------------ */
.chooser { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.chooser button {
  font-size: .95rem;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  border-radius: 99px;
  padding: 7px 13px;
  cursor: pointer;
  min-height: 40px;
}
.chooser button[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); font-weight: 600; }

/* --- picker sheet -------------------------------------------------------- */
.sheet {
  position: fixed;
  inset: 0;
  z-index: 60;
  background: rgba(0,0,0,.45);
  display: flex;
  align-items: flex-end;
  justify-content: center;
}
.sheet-card {
  background: var(--bg);
  width: 100%;
  max-width: 40rem;
  max-height: 88vh;
  border-radius: var(--radius) var(--radius) 0 0;
  display: flex;
  flex-direction: column;
  padding: var(--pad);
  padding-bottom: calc(var(--pad) + env(safe-area-inset-bottom));
}
.sheet-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.sheet-head h2 { font-size: 1.05rem; }
.filters { display: grid; gap: 10px; margin-bottom: 12px; }
.filters .control label { margin-bottom: 4px; }
.sheet-list { overflow-y: auto; -webkit-overflow-scrolling: touch; }

.scenario-item {
  display: block;
  width: 100%;
  text-align: left;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 8px;
  padding: 11px 12px;
  margin-bottom: 7px;
  cursor: pointer;
  color: var(--text);
}
.scenario-item[aria-current="true"] { border-color: var(--accent); }
.scenario-item strong { display: block; font-weight: 600; }
.scenario-item span { display: block; color: var(--muted); font-size: .88rem; margin-top: 3px; }
.empty { color: var(--muted); text-align: center; padding: 24px 0; font-size: .9rem; }

/* --- fullscreen QR ------------------------------------------------------- */
.fs {
  position: fixed;
  inset: 0;
  z-index: 80;
  background: #ffffff;   /* white all the way to the edges: no clipped quiet zone */
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.fs canvas { image-rendering: pixelated; image-rendering: crisp-edges; display: block; }
.fs-bar {
  position: absolute;
  left: 0; right: 0;
  bottom: calc(8px + env(safe-area-inset-bottom));
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  color: #333;
}

.foot { color: var(--muted); font-size: .85rem; border-top: 1px solid var(--line); padding-top: 12px; }
.foot p { margin: 0 0 4px; }

@media (min-width: 34rem) {
  .controls { grid-template-columns: repeat(4, 1fr); }
  .filters { grid-template-columns: repeat(2, 1fr); }
}