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

:root {
  --bg: #0d0c08;
  --surface: #161510;
  --surface2: #1a1914;
  --border: #3a3525;
  --accent: #e8a22e;
  --accent-hi: #ffc44a;
  --accent-dim: #8a5e18;
  --text: #c9a84c;
  --text2: #7a6530;
  --green: #4a8c3f;
  --red: #c0392b;
  --radius: 4px;
  --font: 'Special Elite', 'Courier New', monospace;
  --scanline: repeating-linear-gradient(
    0deg, transparent, transparent 2px,
    rgba(0,0,0,.08) 2px, rgba(0,0,0,.08) 4px
  );
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: var(--scanline);
  pointer-events: none;
  z-index: 9999;
}

header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

header h1 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--accent-hi);
  text-shadow: 0 0 12px #e8a22e66, 0 0 40px #e8a22e22;
}

header .subtitle {
  font-size: 0.78rem;
  color: var(--text2);
}

.main {
  display: flex;
  flex: 1;
  overflow: hidden;
  height: calc(100vh - 53px - 31px); /* subtract header + footer */
}

/* ── Sidebar ── */
.sidebar {
  width: 340px;
  min-width: 260px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sidebar-section {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}

.sidebar-section h3 {
  font-size: 0.7rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text2);
  margin-bottom: 12px;
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  gap: 8px;
}

.setting-row:last-child { margin-bottom: 0; }

.setting-label {
  font-size: 0.82rem;
  color: var(--text);
  white-space: nowrap;
}

.setting-val {
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 600;
  min-width: 36px;
  text-align: right;
}

.slider-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
}

input[type=range] {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  transition: background 0.15s;
}

input[type=range]::-webkit-slider-thumb:hover { background: var(--accent-hi); }

.list-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
}

.list-tabs button {
  flex: 1;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text2);
  font-size: 0.75rem;
  padding: 8px 4px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  font-family: var(--font);
}

.list-tabs button.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.word-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.word-list::-webkit-scrollbar { width: 5px; }
.word-list::-webkit-scrollbar-track { background: transparent; }
.word-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

.word-chip {
  display: inline-block;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.72rem;
  padding: 2px 7px;
  margin: 2px;
  color: var(--text2);
  cursor: default;
  transition: border-color 0.15s, color 0.15s;
}

.word-chip.active-word {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(74, 158, 255, 0.1);
}

.upload-row {
  padding: 10px 16px;
  border-top: 1px solid var(--border);
}

.upload-btn {
  width: 100%;
  background: var(--surface2);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  color: var(--text2);
  font-size: 0.78rem;
  padding: 8px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
  font-family: var(--font);
}

.upload-btn:hover { border-color: var(--accent); color: var(--accent); }

#csvInput { display: none; }

#csvFilename {
  font-size: 0.72rem;
  color: var(--green);
  padding: 4px 0;
  display: none;
}

/* ── Practice area ── */
.practice {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 116px 24px;
  gap: 12px;
  overflow-y: auto;
}

.practice-top {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

/* ── Flip card ── */
.card-scene {
  width: 100%;
  max-width: 500px;
  perspective: 1000px;
}

.card-inner {
  width: 100%;
  min-height: 240px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.4, 0.2, 0.2, 1);
}

.card-inner.flipped {
  transform: rotateY(180deg);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  width: 100%;
  padding: 32px;
  text-align: center;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.card-front {
  /* default visible face — blurred while listening */
  transition: filter 0.3s;
}

.morse-display.blurred {
  filter: blur(10px);
  user-select: none;
}

.card-back {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform: rotateY(180deg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.card-category {
  font-size: 0.68rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text2);
  margin-bottom: 16px;
}

.morse-display {
  font-size: 2.2rem;
  letter-spacing: 6px;
  color: var(--accent);
  min-height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  word-break: break-all;
}

.morse-display.playing { color: var(--green); }

.english-display {
  margin-top: 20px;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
  min-height: 40px;
}

.meaning-display {
  margin-top: 6px;
  font-size: 0.85rem;
  color: var(--text2);
  min-height: 22px;
}

/* countdown bar */
.countdown-wrap {
  width: 100%;
  max-width: 500px;
}

.countdown-bar-bg {
  height: 4px;
  background: var(--surface2);
  border-radius: 2px;
  overflow: hidden;
}

.countdown-bar-fill {
  height: 100%;
  background: var(--accent-dim);
  border-radius: 2px;
  transition: width 0.1s linear;
  width: 0%;
}

.countdown-label {
  font-size: 0.72rem;
  color: var(--text2);
  text-align: center;
  margin-top: 4px;
  min-height: 16px;
}

/* status */
.status-line {
  font-size: 0.8rem;
  color: var(--text2);
  min-height: 20px;
}

.status-line.active  { color: var(--green); }
.status-line.paused  { color: var(--accent2); }
.status-line.stopped { color: var(--text2); }

/* controls */
.controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  padding: 10px 22px;
  border-radius: var(--radius);
  border: none;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
  font-family: var(--font);
  letter-spacing: 0.5px;
}

.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.35; cursor: not-allowed; transform: none; }

.btn-start  { background: transparent; color: var(--green);  border: 1px solid var(--green); }
.btn-stop   { background: transparent; color: var(--red);    border: 1px solid var(--red); }
.btn-skip   { background: transparent; color: var(--text2);  border: 1px solid var(--border); }
.btn-reveal { background: transparent; color: var(--accent); border: 1px solid var(--accent); }

.btn-start:hover:not(:disabled)  { background: rgba(74,140,63,.15); }
.btn-stop:hover:not(:disabled)   { background: rgba(192,57,43,.15); }
.btn-skip:hover:not(:disabled)   { background: rgba(58,53,37,.4); }
.btn-reveal:hover:not(:disabled) { background: rgba(232,162,46,.12); }

/* quiz fieldset */
.quiz-fieldset {
  border: 1px solid var(--accent-dim);
  border-radius: var(--radius);
  padding: 8px 10px 6px;
  margin-top: 8px;
}

.quiz-fieldset legend {
  font-size: 0.65rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text2);
  padding: 0 4px;
}

.quiz-fieldset .toggle-row { margin-bottom: 0; }

/* toggle switch */
.toggle-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.toggle {
  position: relative;
  width: 34px;
  height: 18px;
  flex-shrink: 0;
}

.toggle input { opacity: 0; width: 0; height: 0; }

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--border);
  border-radius: 9px;
  cursor: pointer;
  transition: background 0.2s;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 12px; height: 12px;
  left: 3px; top: 3px;
  background: #fff;
  border-radius: 50%;
  transition: transform 0.2s;
}

.toggle input:checked + .toggle-slider { background: var(--accent); }
.toggle input:checked + .toggle-slider::before { transform: translateX(16px); }

.progress-info {
  font-size: 0.75rem;
  color: var(--text2);
  min-height: 18px;
}

/* ── Quiz / mic ── */
.quiz-area {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.mic-btn {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: var(--surface2);
  color: var(--text2);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, border-color 0.2s, color 0.2s, transform 0.1s;
}

.mic-btn svg { width: 22px; height: 22px; }

.mic-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.mic-btn.listening {
  background: rgba(232,162,46,.15);
  border-color: var(--accent);
  color: var(--accent);
  animation: mic-pulse 1s ease-in-out infinite;
}

@keyframes mic-pulse {
  0%, 100% { transform: scale(1); }
  50%       { transform: scale(1.1); }
}

.mic-btn.loading {
  border-color: var(--accent2);
  color: var(--accent2);
  cursor: wait;
  animation: mic-spin 1.2s linear infinite;
}

.mic-btn.processing {
  border-color: var(--accent);
  color: var(--accent);
  cursor: wait;
  animation: mic-spin 0.8s linear infinite;
}

@keyframes mic-spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

.whisper-progress {
  width: 120px;
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

.whisper-progress-fill {
  height: 100%;
  background: var(--accent2);
  border-radius: 2px;
  width: 0%;
  transition: width 0.3s ease;
}

.quiz-hint {
  font-size: 0.78rem;
  color: var(--text2);
}

.heard-display {
  font-size: 0.75rem;
  color: var(--text2);
  font-style: italic;
  min-height: 16px;
}

.quiz-result {
  margin-top: 14px;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 6px;
  text-align: center;
}

.quiz-result.correct {
  background: rgba(61, 220, 132, 0.15);
  color: var(--green);
  border: 1px solid var(--green);
}

.quiz-result.wrong {
  background: rgba(255, 92, 92, 0.15);
  color: var(--red);
  border: 1px solid var(--red);
}

.card-inner.shake {
  animation: shake 0.4s ease-in-out;
}

@keyframes shake {
  0%, 100% { transform: rotateY(0deg) translateX(0); }
  20%       { transform: rotateY(0deg) translateX(-8px); }
  40%       { transform: rotateY(0deg) translateX(8px); }
  60%       { transform: rotateY(0deg) translateX(-6px); }
  80%       { transform: rotateY(0deg) translateX(6px); }
}

.score-display {
  font-size: 0.82rem;
  color: var(--text2);
  text-align: center;
}

.score-display .score-correct { color: var(--green); font-weight: 700; }
.score-display .score-wrong   { color: var(--red);   font-weight: 700; }

/* ── Credits footer ── */
.credits {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 6px 20px;
  font-size: 0.7rem;
  color: var(--text2);
  text-align: right;
  flex-shrink: 0;
}

.credits a {
  color: var(--text2);
  text-decoration: none;
}

.credits a:hover {
  color: var(--accent);
  text-decoration: underline;
}