/* ==========================================================
   OPTICAL_QR_TRANSFER — terminal theme
   ========================================================== */

:root {
  --bg:      #000000;
  --panel:   #0a0a0a;
  --border:  #2a2a2a;
  --fg:      #c9c9c9;
  --fg-dim:  #6e6e6e;
  --green:   #33ff66;
  --amber:   #ffb700;
  --red:     #ff4444;
  --mono:    'Courier New', Courier, monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.5;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  border-bottom: 1px solid var(--border);
  padding: 10px 14px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}

.brand { font-weight: bold; letter-spacing: 1px; color: var(--green); font-size: 13px; }
.cursor { animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

.tabs { display: flex; border: 1px solid var(--border); }
.tab-btn {
  background: var(--bg);
  border: none;
  color: var(--fg-dim);
  font-family: var(--mono);
  font-size: 12px;
  padding: 8px 14px;
  cursor: pointer;
  min-height: 36px;
}
.tab-btn + .tab-btn { border-left: 1px solid var(--border); }
.tab-btn.active { background: var(--green); color: #000; font-weight: bold; }

main { flex: 1; width: 100%; max-width: 1000px; margin: 0 auto; padding: 14px; }
.panel { display: none; }
.panel.active { display: block; }

.grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
@media (min-width: 820px) { .grid { grid-template-columns: 1fr 1fr; } }

.box { border: 1px solid var(--border); background: var(--panel); padding: 14px; }
.box-title { color: var(--green); font-size: 12px; margin-bottom: 12px; border-bottom: 1px solid var(--border); padding-bottom: 8px; }

.drop-zone {
  display: block;
  border: 1px dashed var(--border);
  padding: 18px 10px;
  text-align: center;
  cursor: pointer;
  position: relative;
  margin-bottom: 14px;
}
.drop-zone.drag-over { border-color: var(--green); color: var(--green); }
.drop-zone input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
#dropText { color: var(--fg-dim); font-size: 12px; }
.file-info { margin-top: 6px; }
.file-name { color: #fff; font-size: 13px; word-break: break-all; }
.file-size { color: var(--fg-dim); font-size: 11px; margin-top: 2px; }

.field { margin-bottom: 14px; }
.field-label { display: flex; justify-content: space-between; font-size: 11px; color: var(--fg); margin-bottom: 6px; }
.val { color: var(--green); }

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 11px;
  color: var(--green);
}
.checkbox-label input[type="checkbox"] {
  accent-color: var(--green);
  width: 14px;
  height: 14px;
  cursor: pointer;
}

input[type=range] {
  width: 100%;
  height: 4px;
  background: var(--border);
  outline: none;
  appearance: none;
  cursor: pointer;
}
input[type=range]::-webkit-slider-thumb { appearance: none; width: 12px; height: 16px; background: var(--green); cursor: pointer; }
input[type=range]::-moz-range-thumb { width: 12px; height: 16px; background: var(--green); border: none; cursor: pointer; }

.btn-row { display: flex; gap: 6px; }
.btn-row-wrap { flex-wrap: wrap; }
.btn-sm {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--fg-dim);
  font-family: var(--mono);
  font-weight: bold;
  padding: 8px 0;
  cursor: pointer;
  min-height: 36px;
}
.btn-sm.active { border-color: var(--green); color: var(--green); }
.hint { color: var(--fg-dim); font-size: 10px; margin-bottom: 14px; }
.divider {
  text-align: center;
  color: var(--fg-dim);
  font-size: 10px;
  letter-spacing: 1px;
  margin: 16px 0 12px;
  border-top: 1px dashed var(--border);
  padding-top: 12px;
}

.btn-main {
  display: block;
  width: 100%;
  background: var(--green);
  color: #000;
  border: none;
  font-family: var(--mono);
  font-weight: bold;
  font-size: 12px;
  letter-spacing: 0.5px;
  padding: 12px;
  cursor: pointer;
  min-height: 44px;
  text-align: center;
  text-decoration: none;
}
.btn-main:disabled { background: var(--border); color: var(--fg-dim); cursor: not-allowed; }
.btn-main.btn-stop { background: var(--red); color: #000; }
.btn-main.btn-ghost { background: var(--bg); color: var(--fg-dim); border: 1px solid var(--border); flex: 0 0 auto; width: auto; padding: 12px 16px; }
.btn-row-wrap .btn-main:not(.btn-ghost) { flex: 1 1 auto; }
.btn-row .btn-main { flex: 1 1 auto; width: auto; }

.qr-box {
  background: #fff;
  border: 1px solid var(--border);
  position: relative;
  width: 100%;
  max-width: 300px;
  aspect-ratio: 1 / 1;
  margin: 0 auto 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.qr-box canvas { width: 100%; height: 100%; image-rendering: pixelated; }
.overlay-idle {
  position: absolute;
  inset: 0;
  background: #000;
  color: var(--fg-dim);
  font-size: 11px;
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 1px;
}

.progress-track { width: 100%; height: 4px; background: var(--border); margin-bottom: 8px; }
.progress-fill { height: 100%; width: 0%; background: var(--green); }
.stat-line { font-size: 11px; color: var(--fg-dim); margin-bottom: 10px; text-align: center; }

.video-box {
  background: #000;
  border: 1px solid var(--border);
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  margin-bottom: 12px;
}
.video-box video { width: 100%; height: 100%; object-fit: cover; }
.scan-frame { position: absolute; inset: 12%; border: 1px solid var(--green); pointer-events: none; }

.metric-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 12px; }
.metric { border: 1px solid var(--border); padding: 8px; }
.metric-label { font-size: 9px; color: var(--fg-dim); margin-bottom: 3px; }
.metric-val { font-size: 16px; font-weight: bold; color: var(--green); }

/* Canvas 기반 매트릭스 레이아웃 */
.matrix-wrapper {
  border: 1px solid var(--border);
  padding: 4px;
  max-height: 120px;
  overflow-y: auto;
  min-height: 60px;
  margin-bottom: 12px;
  background: #000;
}
.matrix-canvas {
  display: block;
  width: 100%;
  image-rendering: pixelated;
}

.recv-result { border: 1px solid var(--green); padding: 10px; margin-bottom: 12px; }
.recv-filename { font-size: 12px; color: #fff; word-break: break-all; margin-bottom: 8px; }

.log {
  border: 1px solid var(--border);
  background: var(--bg);
  height: 130px;
  overflow-y: auto;
  padding: 6px 8px;
  font-size: 10px;
  color: var(--fg-dim);
}
.log div { white-space: pre-wrap; word-break: break-all; }
.log .ok   { color: var(--green); }
.log .err  { color: var(--red); }
.log .warn { color: var(--amber); }

.hidden { display: none !important; }