/* Base theme */
:root {
  --bg: #0b0c10;
  --surface: #111319;
  --elev-1: #151925;
  --text: #e6e8ee;
  --muted: #9aa3b2;
  --primary: #4f8cff;
  --primary-600: #3d72d9;
  --ring: rgba(79, 140, 255, 0.6);
  --ok: #3ddc97;
  --warn: #ffb020;
  --err: #ff6b6b;
  --card-radius: 14px;
  --gap: 16px;
  --shadow: 0 6px 20px rgba(0,0,0,0.35);
  --font: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f7fb;
    --surface: #ffffff;
    --elev-1: #ffffff;
    --text: #1f2430;
    --muted: #5b6472;
    --shadow: 0 10px 30px rgba(24, 36, 56, 0.12);
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: radial-gradient(1200px 800px at 80% -200px, rgba(79,140,255,0.12), transparent 60%),
              radial-gradient(900px 600px at -200px 100%, rgba(61,220,151,0.10), transparent 60%),
              var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* Page height for full backgrounds; horizontal centering handled by container */
  min-height: 100vh;
  min-height: 100dvh;
}

.container {
  max-width: 1080px;
  padding: 28px 20px 40px;
  margin: 0 auto; /* horizontal centering for overflow cases */
  width: 100%;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap);
  margin-bottom: 22px;
}

h1 {
  font-size: clamp(20px, 3vw, 28px);
  line-height: 1.2;
  margin: 0;
  letter-spacing: 0.2px;
}

.muted { color: var(--muted); font-weight: 500; }

.link.subtle {
  color: var(--muted);
  text-decoration: none;
  border: 1px solid rgba(150,160,180,0.25);
  padding: 8px 12px;
  border-radius: 999px;
  transition: .2s ease;
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(0,0,0,0.02));
}
.link.subtle:hover { color: var(--text); border-color: rgba(150,160,180,0.4); transform: translateY(-1px); }

.grid {
  display: grid;
  gap: var(--gap);
}

.layout {
  /* Single centered column */
  grid-template-columns: 1fr;
  justify-items: center;
}

@media (max-width: 920px) {
  .layout { grid-template-columns: 1fr; }
}

/* Constrain inner column and keep it centered */
.left { width: 100%; max-width: 760px; }

.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(0,0,0,0.02)), var(--elev-1);
  border: 1px solid rgba(150,160,180,0.16);
  box-shadow: var(--shadow);
  border-radius: var(--card-radius);
}

.controls {
  padding: 16px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap);
}

@media (max-width: 680px) {
  .controls { grid-template-columns: 1fr 1fr; }
  .controls .btn { grid-column: span 2; }
}

.field { display: grid; gap: 8px; }
.field label { font-size: 13px; color: var(--muted); }

select, input[type="number"] {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid rgba(150,160,180,0.28);
  background: var(--surface);
  color: var(--text);
  outline: none;
  transition: .2s ease;
}
select:focus, input[type="number"]:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--ring); }

.btn {
  align-self: end;
  height: 40px;
  border: none;
  border-radius: 12px;
  padding: 0 16px;
  font-weight: 600;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease;
}
.btn.primary {
  color: #fff;
  background: linear-gradient(180deg, var(--primary), var(--primary-600));
  box-shadow: 0 8px 18px rgba(79, 140, 255, 0.35);
}
.btn.primary:hover { transform: translateY(-1px); }
.btn.primary:active { transform: translateY(0); }

/* Neutral/ghost style for secondary actions */
.btn.ghost {
  color: var(--text);
  background: var(--surface);
  border: 1px solid rgba(150,160,180,0.28);
}
.btn.ghost:hover { border-color: rgba(150,160,180,0.45); transform: translateY(-1px); }
.btn.ghost:active { transform: translateY(0); }

.preview { display: grid; gap: var(--gap); }

.video-wrap, .captured-wrap {
  padding: 12px;
}
.video-frame {
  position: relative;
  overflow: hidden;
  border-radius: 12px;
  border: 1px solid rgba(150,160,180,0.2);
  background: #000;
}
.video-frame video {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  background: #000;
}
.video-frame img {
  display: block;
  max-width: 100%;
  max-height: 400px;
  width: auto;
  height: auto;
  object-fit: contain;
  margin: 0 auto;
}

.result {
  padding: 14px 16px;
  font-size: 14px;
  width: 100%;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.result code.hash {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  background: rgba(150,160,180,0.12);
  border: 1px solid rgba(150,160,180,0.28);
  padding: 2px 6px;
  border-radius: 6px;
  display: inline-block;
  max-width: 100%;
  overflow-wrap: anywhere;
}

.kicker {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  color: var(--muted);
  font-size: 13px;
}
.kicker .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 0 3px rgba(61,220,151,0.15); }

/* Utilities */
.spacer { height: 10px; }