:root {
  --bg:           #080b12;
  --surface:      #0e1420;
  --surface-2:    #141c2e;
  --border:       rgba(255,255,255,0.07);
  --accent:       #3bf0a0;
  --accent-dim:   rgba(59,240,160,0.12);
  --accent-glow:  rgba(59,240,160,0.3);
  --danger:       #ff4f6a;
  --danger-dim:   rgba(255,79,106,0.1);
  --text:         #e2e8f0;
  --text-muted:   #5a6a82;
  --radius-lg:    16px;
  --radius-md:    10px;
  --font-display: 'Syne', sans-serif;
  --font-mono:    'JetBrains Mono', monospace;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  min-height: 100vh;
  display: grid;
  place-items: center;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(59,240,160,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59,240,160,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

.app {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 1060px;
  padding: 32px 20px 48px;
  display: grid;
  grid-template-columns: 480px 1fr;
  grid-template-rows: auto auto;
  gap: 20px;
}

.header {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--border);
}

.logo { display: flex; align-items: baseline; gap: 10px; }

.logo-mark {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #fff;
}

.logo-mark span { color: var(--accent); }

.logo-sub {
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.badge {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 5px 12px;
  border-radius: 99px;
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: background 0.3s;
}

.badge-dot.live { background: var(--accent); animation: pulse 1.8s infinite; }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.25; }
}

.camera-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.panel-title {
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.video-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: #000;
  border: 1px solid var(--border);
}

#video { display: none; }

#overlay {
  width: 100%;
  height: 100%;
  display: block;
}

.video-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 13px;
  pointer-events: none;
}

.video-placeholder svg { opacity: 0.3; }

.video-wrap::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    rgba(59,240,160,0.02) 50%,
    transparent 100%
  );
  animation: scan 4s linear infinite;
  pointer-events: none;
}

@keyframes scan {
  0%   { background-position: 0 -100%; }
  100% { background-position: 0 200%; }
}

.pred-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: center;
}

.pred-letter-box {
  background: var(--accent-dim);
  border: 1px solid var(--accent-glow);
  border-radius: var(--radius-md);
  padding: 10px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.pred-letter {
  font-family: var(--font-display);
  font-size: 42px;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  min-width: 32px;
  text-align: center;
  transition: all 0.15s;
}

.pred-meta { font-size: 10px; color: var(--text-muted); line-height: 1.6; }

.confidence-track {
  height: 3px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
  margin-top: 5px;
  width: 90px;
}

.confidence-fill {
  height: 100%;
  background: var(--accent);
  width: 0%;
  transition: width 0.3s ease;
  border-radius: 99px;
}

.toggle-btn {
  width: 100%;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 11px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.15s;
}

.toggle-btn:hover  { opacity: 0.88; transform: translateY(-1px); }
.toggle-btn:active { transform: translateY(0); }
.toggle-btn.start  { background: var(--accent); color: #000; }
.toggle-btn.stop   { background: var(--danger);  color: #fff; }

.builder-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.builder-top {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: stretch;
}

.detected-box {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.detected-glyph {
  font-family: var(--font-display);
  font-size: 44px;
  font-weight: 800;
  color: var(--text);
  line-height: 1;
  min-width: 36px;
  text-align: center;
}

.detected-glyph.pop { animation: pop 0.18s ease; }

@keyframes pop {
  0%   { transform: scale(0.7); opacity: 0.4; }
  60%  { transform: scale(1.1); }
  100% { transform: scale(1);   opacity: 1; }
}

.detected-meta { display: flex; flex-direction: column; gap: 6px; }

.meta-label {
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.hold-track {
  height: 3px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
  width: 100px;
}

.hold-fill {
  height: 100%;
  width: 0%;
  background: var(--text-muted);
  border-radius: 99px;
  transition: width 0.05s linear;
}

.hold-fill.ready { background: var(--accent); }

.mode-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.mode-btn {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 7px 14px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.12s;
  white-space: nowrap;
}

.mode-btn:hover  { border-color: var(--accent); color: var(--accent); background: var(--accent-dim); }
.mode-btn.active { border-color: var(--accent); color: var(--accent); background: var(--accent-dim); }

.word-display {
  min-height: 62px;
  background: var(--bg);
  border: 1px dashed var(--border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 3px;
  position: relative;
}

.char-chip {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  animation: chipIn 0.18s ease;
}

.space-chip {
  display: inline-block;
  width: 12px;
}

@keyframes chipIn {
  from { opacity: 0; transform: translateY(6px) scale(0.85); }
  to   { opacity: 1; transform: translateY(0)  scale(1); }
}

.cursor-blink {
  display: inline-block;
  width: 2px;
  height: 30px;
  background: var(--accent);
  animation: blink 1s step-end infinite;
  border-radius: 1px;
  vertical-align: middle;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

.word-empty-hint {
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  position: absolute;
  left: 16px;
  pointer-events: none;
}

.action-row {
  display: flex;
  gap: 6px;
}

.act-btn {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  padding: 7px 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.12s;
  flex: 1;
  white-space: nowrap;
}

.act-btn:hover        { border-color: var(--accent); color: var(--accent); background: var(--accent-dim); }
.act-btn.danger:hover { border-color: var(--danger); color: var(--danger); background: var(--danger-dim); }

.history-label {
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  padding-top: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.history-clear-link {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0;
  text-transform: none;
  transition: color 0.12s;
}

.history-clear-link:hover { color: var(--danger); }

.history-log {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 180px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.history-item {
  font-size: 13px;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  animation: chipIn 0.2s ease;
}

.history-text { flex: 1; word-break: break-word; }

.history-copy {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 3px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.12s;
  white-space: nowrap;
}

.history-copy:hover { border-color: var(--accent); color: var(--accent); }

.history-empty {
  font-size: 11px;
  color: var(--text-muted);
  padding: 6px 0;
}

.copy-all-btn {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  padding: 7px 14px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.12s;
  align-self: flex-start;
}

.copy-all-btn:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-dim); }

.shortcuts {
  grid-column: 1 / -1;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
  padding-top: 4px;
}

.shortcut-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 0.06em;
}

kbd {
  font-family: var(--font-mono);
  font-size: 9px;
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 3px;
  padding: 1px 5px;
  background: var(--surface-2);
  color: var(--text);
}

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 8px 18px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text);
  opacity: 0;
  transition: opacity 0.2s, transform 0.2s;
  pointer-events: none;
  z-index: 100;
}

.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 780px) {
  .app { grid-template-columns: 1fr; padding: 20px 14px 40px; }
  .header { flex-direction: column; align-items: flex-start; gap: 10px; }
}