/* ── Design: industrial/utilitarian terminal feel ── */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=IBM+Plex+Sans:wght@300;400;500&display=swap');

:root {
  --bg:       #0e0f11;
  --surface:  #161820;
  --panel:    #1d1f26;
  --border:   #2a2d38;
  --accent:   #00e5a0;
  --accent2:  #4f8aff;
  --warn:     #ffb340;
  --danger:   #ff5757;
  --text:     #d4d8e8;
  --muted:    #666c82;
  --mono:     'IBM Plex Mono', monospace;
  --sans:     'IBM Plex Sans', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.2;
  min-height: 100vh;
  padding: 24px 16px 48px;
}

h1 {
  font-family: var(--mono);
  font-size: 18px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}
.subtitle {
  color: var(--muted);
  font-size: 12px;
  font-family: var(--mono);
  margin-bottom: 28px;
}

.tabs {
  display: flex;
  gap: 2px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.tab {
  font-family: var(--mono);
  font-size: 12px;
  padding: 8px 20px;
  border: none;
  background: none;
  color: var(--muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color .15s, border-color .15s;
}
.tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.tab:hover:not(.active) { color: var(--text); }

.panel { display: none; }
.panel.active { display: block; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 20px;
  margin-bottom: 16px;
}
.card-title {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: .1em;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.toggle-link {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent2);
  cursor: pointer;
  margin-bottom: 12px;
  user-select: none;
  transition: color .15s;
}
.toggle-link:hover {
  color: var(--accent);
}

label {
  display: block;
  font-size: 12px;
  color: var(--muted);
  font-family: var(--mono);
  margin-bottom: 6px;
}

textarea, input[type="text"] {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 12px;
  padding: 10px 12px;
  resize: vertical;
  outline: none;
  transition: border-color .15s;
}
textarea:focus, input:focus { border-color: var(--accent); }
textarea { min-height: 72px; }

.drop-zone {
  border: 1px dashed var(--border);
  border-radius: 6px;
  background: var(--surface);
  padding: 28px;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s, background .2s;
  position: relative;
}
.drop-zone:hover, .drop-zone.over {
  border-color: var(--accent);
  background: #1a2420;
}
.drop-zone input[type="file"] {
  position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%;
}
.drop-icon { font-size: 28px; margin-bottom: 8px; }
.drop-label { font-family: var(--mono); font-size: 12px; color: var(--muted); }

button.action {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .05em;
  padding: 10px 22px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  background: var(--accent);
  color: #000;
  transition: opacity .15s, transform .1s;
  margin-top: 8px;
}
button.action:hover { opacity: .85; }
button.action:active { transform: scale(.98); }
button.action.secondary { background: var(--accent2); }

.preview-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 16px;
}
@media (max-width: 600px) { .preview-row { grid-template-columns: 1fr; } }

.img-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px;
  text-align: center;
}
.img-box canvas, .img-box img {
  max-width: 100%;
  border-radius: 4px;
  display: block;
  margin: 0 auto 8px;
  image-rendering: pixelated;
}
.img-label {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted);
}

.log {
  font-family: var(--mono);
  font-size: 11px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 12px;
  max-height: 180px;
  overflow-y: auto;
  margin-top: 12px;
  line-height: 1.8;
}
.log .ok   { color: var(--accent); }
.log .info { color: var(--accent2); }
.log .warn { color: var(--warn); }
.log .err  { color: var(--danger); }

.bit-vis {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  margin-top: 10px;
  max-height: 120px;
  overflow: hidden;
}
.bit-cell {
  width: 10px; height: 10px;
  border-radius: 1px;
  background: var(--border);
  transition: background .3s;
}
.bit-cell.used { background: var(--accent); }

.result-box {
  background: var(--surface);
  border: 1px solid var(--accent);
  border-radius: 4px;
  padding: 14px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  word-break: break-all;
  margin-top: 12px;
  white-space: pre-wrap;
}

a.dl-btn {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  text-decoration: none;
  border: 1px solid var(--accent);
  padding: 5px 14px;
  border-radius: 3px;
  transition: background .15s;
}
a.dl-btn:hover { background: #00e5a020; }

.stat-row {
  display: flex; gap: 20px; flex-wrap: wrap; margin-top: 10px;
}
.stat {
  font-family: var(--mono);
  font-size: 11px;
}
.stat span { color: var(--accent2); font-weight: 600; }