/* ===== Panels Layout ===== */
.panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

/* ===== Panel Card ===== */
.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.panel--input.mode-encode {
  border-color: rgba(34, 197, 94, 0.2);
  box-shadow: 0 0 30px rgba(34, 197, 94, 0.05);
}

.panel--input.mode-decode {
  border-color: rgba(245, 158, 11, 0.2);
  box-shadow: 0 0 30px rgba(245, 158, 11, 0.05);
}

.panel--input.mode-hash {
  border-color: rgba(239, 68, 68, 0.2);
  box-shadow: 0 0 30px rgba(239, 68, 68, 0.05);
}

.panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.panel__title {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.panel__actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ===== Mode Toggle ===== */
.mode-toggle {
  display: flex;
  background: var(--surface);
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
}

.mode-btn {
  padding: 5px 14px;
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  background: transparent;
  color: var(--text-muted);
}

.mode-btn--encode.active {
  background: var(--encode-dim);
  color: var(--encode);
}

.mode-btn--decode.active {
  background: var(--decode-dim);
  color: var(--decode);
}

.mode-btn--hash {
  cursor: default;
}

.mode-btn--hash.active {
  background: var(--hash-dim);
  color: var(--hash);
}

.mode-btn:not(.active):hover {
  color: var(--text);
}

/* ===== Textarea ===== */
.panel__textarea {
  width: 100%;
  min-height: 200px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.6;
  resize: vertical;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.panel__textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(167, 139, 250, 0.1);
}

.panel__textarea--output {
  color: var(--text-code);
}

.panel__textarea--output.decode-output {
  color: var(--decode);
}

.panel__textarea--output.hash-output {
  color: var(--hash);
}

.panel__textarea::placeholder {
  color: var(--text-muted);
  font-style: italic;
}

/* ===== Parameters Row ===== */
.params-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

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

.param-group label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
}

.param-input {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  width: 120px;
  transition: border-color var(--transition);
}

.param-input:focus {
  outline: none;
  border-color: var(--primary);
}

.param-input--number {
  width: 70px;
  text-align: center;
}

.param-btn {
  padding: 6px 12px;
  background: var(--primary-dim);
  border: 1px solid rgba(167, 139, 250, 0.3);
  border-radius: var(--radius-sm);
  color: var(--primary);
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.param-btn:hover {
  background: rgba(167, 139, 250, 0.25);
}

/* Hash badge */
.hash-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  background: var(--hash-dim);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: 20px;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--hash);
}

/* ===== Stats Row ===== */
.stats-row {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

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

.stat strong {
  color: var(--text);
  font-family: var(--font-mono);
  font-weight: 500;
}

/* ===== Visualizer ===== */
.visualizer {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.visualizer__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 14px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: color var(--transition);
}

.visualizer__toggle:hover {
  color: var(--text);
}

.visualizer__chevron {
  transition: transform 0.3s ease;
}

.visualizer.open .visualizer__chevron {
  transform: rotate(180deg);
}

.visualizer__content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 20px;
}

.visualizer.open .visualizer__content {
  max-height: 2000px;
  padding: 0 20px 20px;
}

/* ===== Step Cards ===== */
.step-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
}

.step-card:last-child {
  margin-bottom: 0;
}

.step-card__header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.step-card__number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  background: var(--primary);
  color: #0f0f1a;
  border-radius: 50%;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

.step-card__title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
}

.step-card__body {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.8;
  color: var(--text-muted);
}

.step-card__body .highlight {
  color: var(--text);
}

.step-card__body .encode-char {
  color: var(--encode);
  font-weight: 600;
}

.step-card__body .decode-char {
  color: var(--decode);
  font-weight: 600;
}

.step-card__body .arrow {
  color: var(--primary);
  margin: 0 4px;
}

.step-card__body .warning {
  color: var(--hash);
  font-family: var(--font-body);
  font-weight: 500;
}

/* Alphabet strip */
.alphabet-strip {
  display: flex;
  gap: 1px;
  overflow-x: auto;
  padding: 8px 0;
  margin: 8px 0;
}

.alphabet-strip__char {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--card);
  border-radius: 3px;
  flex-shrink: 0;
  transition: all var(--transition);
}

.alphabet-strip__char.from {
  background: var(--primary);
  color: #0f0f1a;
  font-weight: 700;
}

.alphabet-strip__char.to {
  background: var(--encode);
  color: #0f0f1a;
  font-weight: 700;
}

/* Char mapping grid */
.char-map {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 4px;
}

.char-map__item {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 2px 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

/* ===== Compare Mode ===== */
.compare-mode {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.compare-input {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.compare-input__label {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.compare-input .panel__textarea {
  min-height: 100px;
}

.compare-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.compare-column {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.compare-column__header {
  display: flex;
  align-items: center;
  gap: 8px;
}

.compare-column__select {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.8rem;
  cursor: pointer;
}

.compare-column__select:focus {
  outline: none;
  border-color: var(--primary);
}

.compare-column__output {
  width: 100%;
  min-height: 120px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  color: var(--text-code);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.5;
  resize: vertical;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .panels {
    grid-template-columns: 1fr;
  }

  .compare-columns {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .panel {
    padding: 16px;
  }

  .panel__textarea {
    min-height: 150px;
  }

  .compare-columns {
    grid-template-columns: 1fr;
  }

  .stats-row {
    gap: 8px;
  }

  .stat {
    font-size: 0.65rem;
  }
}

@media (max-width: 480px) {
  .panel__header {
    flex-direction: column;
    align-items: flex-start;
  }

  .params-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .param-input {
    width: 100%;
  }
}