/* ═══════════════════════════════════════════════════════
   CW Trainer v0.4 — Style
   Tema: radio industriale, verde fosforo su sfondo scuro
════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Share+Tech+Mono&family=Exo+2:wght@300;400;600;700&display=swap');

/* ─── CSS Variables ─── */
:root {
  --bg-base:       #0d0f0e;
  --bg-panel:      #141714;
  --bg-card:       #181c18;
  --bg-card-hover: #1e231e;
  --bg-input:      #0f120f;

  --green-bright:  #39ff52;
  --green-mid:     #22c73a;
  --green-dim:     #0f6620;
  --green-faint:   #0a2e0d;
  --green-glow:    rgba(57, 255, 82, 0.18);

  --amber:         #ffb83f;
  --amber-dim:     #7a5000;
  --red-alert:     #ff4040;
  --blue-accent:   #3fbfff;

  --text-primary:  #d4ffd8;
  --text-secondary:#7aaa7f;
  --text-muted:    #3d5c40;
  --text-dim:      #243326;

  --border:        #1e2e1f;
  --border-bright: #2a4a2c;
  --border-focus:  var(--green-mid);

  --radius-sm:     4px;
  --radius-md:     8px;
  --radius-lg:     12px;

  --font-mono:     'Share Tech Mono', monospace;
  --font-ui:       'Exo 2', sans-serif;

  --shadow-card:   0 2px 16px rgba(0,0,0,0.6), 0 0 0 1px var(--border);
  --shadow-glow:   0 0 20px var(--green-glow);
  --transition:    0.18s ease;
}

/* ─── Reset & Base ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { height: 100%; }

body {
  font-family: var(--font-ui);
  background: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  /* scanline texture */
  background-image: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.08) 2px,
    rgba(0,0,0,0.08) 4px
  );
}

/* ─── Header ─── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border-bright);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(0,0,0,0.5);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.header-icon {
  font-size: 22px;
  filter: drop-shadow(0 0 6px var(--green-bright));
  animation: pulse-icon 3s ease-in-out infinite;
}

@keyframes pulse-icon {
  0%, 100% { filter: drop-shadow(0 0 6px var(--green-bright)); }
  50% { filter: drop-shadow(0 0 14px var(--green-bright)); }
}

.app-header h1 {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  letter-spacing: 0.15em;
  color: var(--green-bright);
  text-shadow: 0 0 12px var(--green-glow);
  text-transform: uppercase;
}

.header-version {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--green-dim);
  background: var(--green-faint);
  border: 1px solid var(--green-dim);
  padding: 2px 7px;
  border-radius: 3px;
  letter-spacing: 0.1em;
}

.header-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

/* ─── Main Layout ─── */
.app-main {
  display: grid;
  grid-template-columns: 280px 1fr 280px;
  gap: 16px;
  padding: 16px;
  flex: 1;
  max-width: 1300px;
  margin: 0 auto;
  width: 100%;
}

.panel { display: flex; flex-direction: column; gap: 12px; }

/* ─── Cards ─── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition);
}

.card:hover { border-color: var(--border-bright); }

.card-title {
  display: flex;
  align-items: center;
  gap: 8px;
  position: relative;
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.card-title-icon { font-size: 14px; }
.ml-auto { margin-left: auto; }

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-ui);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-primary {
  background: var(--green-mid);
  color: #000;
  border-color: var(--green-bright);
}
.btn-primary:hover:not(:disabled) {
  background: var(--green-bright);
  box-shadow: 0 0 12px var(--green-glow);
}

.btn-secondary {
  background: transparent;
  color: var(--green-mid);
  border-color: var(--green-dim);
}
.btn-secondary:hover:not(:disabled) {
  background: var(--green-faint);
  border-color: var(--green-mid);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: var(--border-bright);
}
.btn-ghost:hover:not(:disabled) {
  color: var(--text-primary);
  border-color: var(--green-dim);
  background: var(--bg-card-hover);
}

.btn-danger { color: var(--red-alert) !important; }
.btn-danger:hover:not(:disabled) { border-color: var(--red-alert) !important; background: rgba(255,64,64,0.08) !important; }

.btn-sm { padding: 5px 10px; font-size: 0.75rem; }
.btn-xs { padding: 3px 8px; font-size: 0.72rem; }

.btn-play {
  background: var(--green-mid);
  color: #000;
  border-color: var(--green-bright);
  padding: 10px 20px;
  font-size: 0.9rem;
  flex: 1;
}
.btn-play:hover:not(:disabled) {
  background: var(--green-bright);
  box-shadow: var(--shadow-glow);
}

.btn-stop {
  background: transparent;
  color: var(--red-alert);
  border-color: var(--red-alert);
  padding: 10px 16px;
  font-size: 0.9rem;
}
.btn-stop:hover:not(:disabled) { background: rgba(255,64,64,0.12); }

/* ─── Form controls ─── */
.param-group {
  margin-bottom: 12px;
}
.param-group:last-child { margin-bottom: 0; }

.param-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
  letter-spacing: 0.03em;
}

.param-value-badge {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--green-bright);
  background: var(--green-faint);
  border: 1px solid var(--green-dim);
  padding: 1px 6px;
  border-radius: 3px;
  min-width: 40px;
  text-align: center;
}

.param-hint {
  font-size: 0.68rem;
  color: var(--text-muted);
  margin-top: 4px;
  font-family: var(--font-mono);
}

.param-row-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

/* ─── Sliders ─── */
.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--bg-input);
  border: 1px solid var(--border-bright);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--green-mid);
  border: 2px solid var(--green-bright);
  box-shadow: 0 0 6px var(--green-glow);
  cursor: pointer;
  transition: all var(--transition);
}

.slider::-webkit-slider-thumb:hover {
  background: var(--green-bright);
  box-shadow: 0 0 12px var(--green-glow);
  transform: scale(1.2);
}

.slider.slider-accent::-webkit-slider-thumb {
  background: var(--amber);
  border-color: var(--amber);
  box-shadow: 0 0 6px rgba(255,184,63,0.4);
}

.slider-sm { height: 3px; }

/* ─── Select ─── */
.select {
  width: 100%;
  padding: 7px 10px;
  background: var(--bg-input);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: 0.8rem;
  outline: none;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%237aaa7f' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 30px;
}

.select:focus { border-color: var(--border-focus); box-shadow: 0 0 0 2px rgba(34,199,58,0.15); }
.select-sm { font-size: 0.75rem; padding: 5px 8px; }

/* ─── Input number ─── */
.input-num {
  width: 80px;
  padding: 5px 8px;
  background: var(--bg-input);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  outline: none;
  text-align: right;
}
.input-num:focus { border-color: var(--border-focus); }

/* ─── Toggle ─── */
.toggle-label {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
}

.toggle-input { display: none; }

.toggle-track {
  width: 34px;
  height: 18px;
  background: var(--bg-input);
  border: 1px solid var(--border-bright);
  border-radius: 9px;
  position: relative;
  transition: all var(--transition);
  flex-shrink: 0;
}

.toggle-track::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 12px;
  height: 12px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: all var(--transition);
}

.toggle-input:checked + .toggle-track {
  background: var(--green-faint);
  border-color: var(--green-mid);
}

.toggle-input:checked + .toggle-track::after {
  left: 18px;
  background: var(--green-bright);
  box-shadow: 0 0 6px var(--green-glow);
}

.toggle-text {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 600;
  letter-spacing: 0.05em;
}

.badge-info {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--green-faint);
  border: 1px solid var(--green-dim);
  color: var(--green-mid);
  font-size: 0.65rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: help;
  flex-shrink: 0;
}

/* ─── Farnsworth block ─── */
.farnsworth-block {
  background: var(--green-faint);
  border: 1px solid var(--green-dim);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  margin-bottom: 14px;
}

.farnsworth-header {
  display: flex;
  align-items: center;
  gap: 8px;
}

.farnsworth-controls {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--green-dim);
}

.farnsworth-hint { color: var(--amber-dim); }

.farnsworth-controls .param-hint { color: var(--amber); }

/* ─── Sequence Builder ─── */
.sequence-builder {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-height: 60px;
  padding: 8px;
  background: var(--bg-input);
  border: 1px dashed var(--border-bright);
  border-radius: var(--radius-md);
  align-items: flex-start;
  position: relative;
}

.sequence-builder.drag-over {
  border-color: var(--green-mid);
  background: var(--green-faint);
}

.sequence-empty {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-style: italic;
  align-self: center;
  width: 100%;
  text-align: center;
  padding: 10px;
}

/* Sequence block chips */
.seq-block {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 8px 10px;
  border-radius: var(--radius-md);
  border: 1px solid;
  font-size: 0.75rem;
  cursor: grab;
  user-select: none;
  transition: all var(--transition);
  min-width: 90px;
  position: relative;
}

.seq-block:active { cursor: grabbing; }
.seq-block.dragging { opacity: 0.4; transform: scale(0.95); }
.seq-block.drag-over-target { transform: translateX(4px); }

.seq-block-cw    { background: rgba(57,255,82,0.08);  border-color: var(--green-mid);   color: var(--green-bright); }
.seq-block-pause { background: rgba(63,191,255,0.08); border-color: var(--blue-accent); color: var(--blue-accent); }
.seq-block-voice { background: rgba(255,184,63,0.08); border-color: var(--amber);       color: var(--amber); }

.seq-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 700;
  letter-spacing: 0.05em;
  font-size: 0.72rem;
  text-transform: uppercase;
}

.seq-block-remove {
  background: none;
  border: none;
  color: inherit;
  opacity: 0.5;
  cursor: pointer;
  padding: 0;
  font-size: 12px;
  line-height: 1;
  transition: opacity var(--transition);
}
.seq-block-remove:hover { opacity: 1; }

.seq-block-params { display: flex; flex-direction: column; gap: 3px; }

.seq-block-param {
  display: flex;
  align-items: center;
  gap: 6px;
}

.seq-block-param label {
  font-size: 0.65rem;
  opacity: 0.75;
  white-space: nowrap;
  min-width: 20px;
}

.seq-block-param input[type="range"] {
  flex: 1;
  height: 3px;
  padding: 0;
  accent-color: currentColor;
}

.seq-block-param .mini-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  min-width: 28px;
  text-align: right;
  opacity: 0.9;
}

.seq-block-param select {
  font-size: 0.65rem;
  background: rgba(0,0,0,0.3);
  border: 1px solid currentColor;
  color: inherit;
  border-radius: 3px;
  padding: 1px 4px;
  opacity: 0.9;
}

/* Block picker dropdown */
.input-text {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-ui);
  padding: 4px 8px;
}
.input-text-sm { font-size: 0.8rem; width: 160px; }
.block-picker-wrapper {
  position: relative;
  margin-left: auto;
}
.block-picker {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  z-index: 200;
  background: var(--bg-panel);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(0,0,0,0.6);
  min-width: 200px;
}

.block-picker-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 11px 16px;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: 0.82rem;
  cursor: pointer;
  transition: background var(--transition);
  text-align: left;
}

.block-picker-item small {
  font-size: 0.68rem;
  color: var(--text-muted);
  margin-left: auto;
}

.block-picker-item:hover { background: var(--bg-card-hover); }

.block-icon-cw    { color: var(--green-bright); }
.block-icon-pause { color: var(--blue-accent); }
.block-icon-voice { color: var(--amber); }

/* ─── Session Options Grid ─── */
.session-options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

/* ─── Token Textarea ─── */
.token-textarea {
  width: 100%;
  height: 180px;
  background: var(--bg-input);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 10px;
  resize: vertical;
  outline: none;
  line-height: 1.6;
}

.token-textarea:focus { border-color: var(--border-focus); box-shadow: 0 0 0 2px rgba(34,199,58,0.1); }

.token-actions {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.badge-count {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  background: var(--green-faint);
  color: var(--green-mid);
  border: 1px solid var(--green-dim);
  border-radius: 10px;
  padding: 1px 8px;
  margin-left: 4px;
}

/* ─── Player ─── */
.player-display {
  background: var(--bg-input);
  border: 1px solid var(--green-dim);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
  margin-bottom: 14px;
  box-shadow: inset 0 0 20px rgba(0,0,0,0.4), 0 0 8px var(--green-glow);
}

.player-token-current {
  font-family: var(--font-mono);
  font-size: 2.4rem;
  color: var(--green-bright);
  text-shadow: 0 0 20px var(--green-glow), 0 0 40px rgba(57,255,82,0.3);
  letter-spacing: 0.1em;
  min-height: 50px;
  line-height: 1.2;
  transition: all 0.2s ease;
}

.player-progress-row {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
}

.player-stat {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

.player-wpm-display {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--green-dim);
  margin-top: 4px;
}

.player-controls {
  display: flex;
  gap: 8px;
}

.player-status {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 10px;
  min-height: 18px;
  letter-spacing: 0.05em;
  transition: color 0.3s;
}

.player-status.playing { color: var(--green-mid); }
.player-status.error   { color: var(--red-alert); }

/* ─── Modal Config ─── */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 500;
  background: rgba(0,0,0,0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}

.modal-dialog {
  background: var(--bg-panel);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-lg);
  width: 600px;
  max-width: 96vw;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 16px 48px rgba(0,0,0,0.8), 0 0 0 1px var(--green-dim);
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.modal-header h2 {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-primary);
}

.btn-modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.btn-modal-close:hover { color: var(--text-primary); background: var(--bg-card-hover); }

.modal-body {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 14px 20px;
  border-top: 1px solid var(--border);
}

.config-section { display: flex; flex-direction: column; gap: 12px; }

.config-section-title {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--green-mid);
  border-bottom: 1px solid var(--green-faint);
  padding-bottom: 6px;
}

.config-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.config-row label {
  font-size: 0.78rem;
  color: var(--text-secondary);
  flex: 1;
}

/* ─── ICAO grid ─── */
.icao-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 6px;
}

.icao-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.icao-item label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--green-mid);
  min-width: 16px;
}

.icao-item input[type="text"] {
  flex: 1;
  padding: 3px 6px;
  background: var(--bg-input);
  border: 1px solid var(--border-bright);
  border-radius: 3px;
  color: var(--text-primary);
  font-size: 0.72rem;
  font-family: var(--font-mono);
  outline: none;
}
.icao-item input:focus { border-color: var(--border-focus); }

/* ─── Toast ─── */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
  background: var(--bg-panel);
  border: 1px solid var(--green-mid);
  color: var(--green-bright);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 16px rgba(0,0,0,0.6), 0 0 12px var(--green-glow);
  animation: toast-in 0.25s ease;
  max-width: 320px;
}

.toast.toast-error {
  border-color: var(--red-alert);
  color: var(--red-alert);
  box-shadow: 0 4px 16px rgba(0,0,0,0.6), 0 0 12px rgba(255,64,64,0.2);
}

@keyframes toast-in {
  from { transform: translateY(12px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

/* ─── Utilities ─── */
.hidden { display: none !important; }
.mt-2   { margin-top: 10px; }
.mt-0   { margin-top: 0; }

/* ─── Scrollbar ─── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--green-dim); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--green-mid); }

/* ─── Responsive ─── */
@media (max-width: 1100px) {
  .app-main {
    grid-template-columns: 260px 1fr 260px;
  }
}

@media (max-width: 900px) {
  .app-main {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto auto;
  }
  .panel-left  { grid-column: 1; }
  .panel-center { grid-column: 2; }
  .panel-right  { grid-column: 1 / -1; }
}

@media (max-width: 600px) {
  .app-main {
    grid-template-columns: 1fr;
    padding: 10px;
  }
  .panel-left, .panel-center, .panel-right { grid-column: 1; }
  .header-actions { gap: 4px; }
  .app-header { padding: 10px 14px; }
  .app-header h1 { font-size: 1.1rem; }
  .param-row-2col { grid-template-columns: 1fr; }
  .session-options-grid { grid-template-columns: 1fr; }
}

/* ═══════════════════════════════════════════════════════
   v0.5 ADDITIONS — Koch + PWA
════════════════════════════════════════════════════════ */

/* ─── Mode tabs ─── */
.mode-tabs {
  display: flex;
  gap: 2px;
  background: var(--bg-input);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-sm);
  padding: 3px;
}

.mode-tab {
  padding: 6px 16px;
  background: transparent;
  border: none;
  border-radius: 3px;
  color: var(--text-muted);
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: all var(--transition);
}

.mode-tab.active {
  background: var(--green-faint);
  color: var(--green-bright);
  border: 1px solid var(--green-dim);
  box-shadow: 0 0 8px var(--green-glow);
}

.mode-tab:hover:not(.active) {
  color: var(--text-secondary);
  background: var(--bg-card-hover);
}

/* ─── Koch layout override ─── */
.app-main-koch {
  grid-template-columns: 300px 1fr 280px;
}

/* ─── Koch Level Card ─── */
.koch-level-card { position: relative; }

.koch-level-display {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 14px;
}

.koch-level-number {
  font-family: var(--font-mono);
  font-size: 3.2rem;
  color: var(--green-bright);
  text-shadow: 0 0 20px var(--green-glow);
  line-height: 1;
}

.koch-level-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Caratteri attivi Koch */
.koch-chars-active {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 12px;
  min-height: 32px;
}

.koch-char-chip {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 3px 8px;
  background: var(--green-faint);
  border: 1px solid var(--green-dim);
  border-radius: 3px;
  color: var(--green-mid);
  transition: all var(--transition);
}

.koch-char-chip.new {
  background: rgba(57,255,82,0.2);
  border-color: var(--green-bright);
  color: var(--green-bright);
  box-shadow: 0 0 6px var(--green-glow);
}

.koch-next-char {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.koch-next-badge {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--amber);
  font-size: 0.9rem;
}

.koch-btn-group {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  margin-bottom: 12px;
}

.koch-progress-info {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.koch-threshold-hint {
  font-size: 0.7rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* ─── Koch player ─── */
.koch-player-card { }

.koch-player-display {
  margin-bottom: 14px;
}

.koch-session-stats {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: 8px;
  margin-bottom: 14px;
}

.stat-box {
  background: var(--bg-input);
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-sm);
  padding: 8px 6px;
  text-align: center;
}

.stat-box-pct { border-color: var(--green-dim); }

.stat-val {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  color: var(--green-bright);
  line-height: 1;
  margin-bottom: 3px;
}

.stat-box-pct .stat-val { color: var(--amber); }

.stat-lbl {
  font-size: 0.62rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ─── Koch answer area ─── */
.koch-answer-area {
  background: var(--green-faint);
  border: 1px solid var(--green-mid);
  border-radius: var(--radius-md);
  padding: 14px;
  margin-bottom: 12px;
  animation: answer-appear 0.2s ease;
}

@keyframes answer-appear {
  from { transform: translateY(-6px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

.koch-answer-prompt {
  font-size: 0.78rem;
  color: var(--green-mid);
  margin-bottom: 10px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.koch-answer-input-row {
  display: flex;
  gap: 8px;
}

.koch-answer-input {
  flex: 1;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1px solid var(--green-mid);
  border-radius: var(--radius-sm);
  color: var(--green-bright);
  font-family: var(--font-mono);
  font-size: 1.4rem;
  text-align: center;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  outline: none;
  box-shadow: 0 0 12px var(--green-glow);
}

.koch-answer-input:focus {
  border-color: var(--green-bright);
  box-shadow: 0 0 0 2px rgba(57,255,82,0.2), 0 0 12px var(--green-glow);
}

/* ─── Koch feedback ─── */
.koch-feedback {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin-bottom: 10px;
  animation: feedback-pop 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes feedback-pop {
  from { transform: scale(0.9); opacity: 0; }
  to   { transform: scale(1);   opacity: 1; }
}

.koch-feedback.correct {
  background: rgba(57,255,82,0.1);
  border: 1px solid var(--green-mid);
  color: var(--green-bright);
}

.koch-feedback.wrong {
  background: rgba(255,64,64,0.1);
  border: 1px solid var(--red-alert);
  color: var(--red-alert);
}

#koch-feedback-icon { font-size: 1.1rem; }

#koch-feedback-correct {
  margin-left: auto;
  font-size: 0.75rem;
  opacity: 0.7;
}

/* ─── Koch history ─── */
.koch-history {
  max-height: 180px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.koch-history-empty {
  font-size: 0.73rem;
  color: var(--text-muted);
  text-align: center;
  padding: 16px;
  font-style: italic;
}

.history-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 8px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.history-item.ok  { background: rgba(57,255,82,0.06);  color: var(--green-mid); }
.history-item.err { background: rgba(255,64,64,0.06);  color: var(--red-alert); }

.history-char    { font-weight: 700; min-width: 24px; font-size: 0.9rem; }
.history-answer  { opacity: 0.7; }
.history-icon    { margin-left: auto; }

/* ─── Koch progress chart ─── */
.koch-progress-chart {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 280px;
  overflow-y: auto;
}

.chart-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.chart-char {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--green-mid);
  min-width: 20px;
  text-align: right;
}

.chart-bar-bg {
  flex: 1;
  height: 8px;
  background: var(--bg-input);
  border-radius: 4px;
  overflow: hidden;
}

.chart-bar-fill {
  height: 100%;
  border-radius: 4px;
  background: var(--green-mid);
  transition: width 0.4s ease;
}

.chart-bar-fill.high { background: var(--green-bright); }
.chart-bar-fill.mid  { background: var(--amber); }
.chart-bar-fill.low  { background: var(--red-alert); }

.chart-pct {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  min-width: 34px;
  text-align: right;
}

/* ─── Koch sessions log ─── */
.koch-sessions-log {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 200px;
  overflow-y: auto;
}

.session-log-item {
  padding: 7px 10px;
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--green-dim);
  font-size: 0.72rem;
}

.session-log-item.promoted { border-left-color: var(--green-bright); }

.session-log-date   { color: var(--text-muted); margin-bottom: 2px; }
.session-log-result { color: var(--text-secondary); }
.session-log-level  { color: var(--green-mid); font-family: var(--font-mono); }

/* ─── SW status badge ─── */
.sw-badge {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.65rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

.sw-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green-dim);
}

.sw-badge.ready .sw-dot { background: var(--green-bright); box-shadow: 0 0 4px var(--green-glow); }

/* ─── PWA Install Banner ─── */
.pwa-banner {
  position: fixed;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 900;
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-panel);
  border: 1px solid var(--green-mid);
  border-radius: var(--radius-lg);
  padding: 12px 18px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.7), 0 0 16px var(--green-glow);
  font-size: 0.82rem;
  color: var(--text-primary);
  animation: banner-in 0.3s ease;
  white-space: nowrap;
}

@keyframes banner-in {
  from { transform: translateX(-50%) translateY(16px); opacity: 0; }
  to   { transform: translateX(-50%) translateY(0);    opacity: 1; }
}

/* ─── Responsive Koch ─── */
@media (max-width: 1100px) {
  .app-main-koch { grid-template-columns: 270px 1fr 250px; }
}

@media (max-width: 900px) {
  .app-main-koch {
    grid-template-columns: 1fr 1fr;
  }
  .app-main-koch .panel-right { grid-column: 1 / -1; }
}

@media (max-width: 600px) {
  .app-main-koch { grid-template-columns: 1fr; }
  .mode-tabs { display: none; }
  .koch-session-stats { grid-template-columns: 1fr 1fr; }
  .pwa-banner { width: calc(100% - 32px); white-space: normal; }
}

/* ─── Bottone MP3 (v0.6) ─── */
.btn-mp3 {
  color: var(--amber) !important;
  border-color: var(--amber-dim) !important;
}
.btn-mp3:hover:not(:disabled) {
  background: rgba(255,184,63,0.1) !important;
  border-color: var(--amber) !important;
  box-shadow: 0 0 8px rgba(255,184,63,0.25);
}