:root {
  --color-bg: #f4f6f9;
  --color-card: #ffffff;
  --color-text: #1f2937;
  --color-muted: #6b7280;
  --color-border: #e5e7eb;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-success: #16a34a;
  --color-success-hover: #15803d;
  --color-danger: #dc2626;
  --color-danger-hover: #b91c1c;
  --color-secondary: #6b7280;
  --color-warning-bg: #fef2f2;
  --radius: 10px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
}

.app {
  max-width: 860px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.app-header h1 {
  font-size: 1.5rem;
  margin: 0;
}

.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
}

.card h2 {
  margin-top: 0;
  font-size: 1.1rem;
}

.hidden {
  display: none !important;
}

label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 6px;
  color: var(--color-muted);
}

textarea,
input[type="password"],
input[type="text"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  resize: vertical;
}

textarea:focus,
input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.hint {
  font-size: 0.8rem;
  color: var(--color-muted);
  margin: 8px 0 0;
}

/* ===== Buttons ===== */
.btn {
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, opacity 0.15s ease;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
}

.btn-success {
  background: var(--color-success);
  color: #fff;
}
.btn-success:hover:not(:disabled) {
  background: var(--color-success-hover);
}

.btn-secondary {
  background: #e5e7eb;
  color: var(--color-text);
}
.btn-secondary:hover:not(:disabled) {
  background: #d1d5db;
}

.btn-danger {
  background: #fee2e2;
  color: var(--color-danger);
}
.btn-danger:hover:not(:disabled) {
  background: #fecaca;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.82rem;
  background: #eef2ff;
  color: var(--color-primary);
}
.btn-sm:hover:not(:disabled) {
  background: #e0e7ff;
}

.icon-btn {
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  width: 38px;
  height: 38px;
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}
.icon-btn:hover {
  background: #f3f4f6;
}

.btn-copy {
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  padding: 2px 6px;
  border-radius: 6px;
}
.btn-copy:hover {
  background: #f3f4f6;
}

/* ===== Secret key row ===== */
.key-input-row {
  display: flex;
  gap: 8px;
}
.key-input-row input {
  flex: 1;
}

/* ===== Record controls ===== */
.record-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 14px;
}

.record-status {
  font-size: 0.9rem;
  color: var(--color-danger);
  font-weight: 600;
}

.preview-box {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px dashed var(--color-border);
}

.preview-box audio {
  width: 100%;
  margin-bottom: 10px;
}

.preview-actions {
  display: flex;
  gap: 10px;
}

/* ===== Recordings list ===== */
.recordings-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.empty-hint {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin: 0;
}

.recording-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 14px 16px;
}

.recording-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.recording-date {
  font-size: 0.8rem;
  color: var(--color-muted);
}

.badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
.badge-success {
  background: #dcfce7;
  color: var(--color-success-hover);
}
.badge-muted {
  background: #f3f4f6;
  color: var(--color-muted);
}

.recording-script {
  font-size: 0.92rem;
  margin: 0 0 10px;
  color: var(--color-text);
}

.recording-item audio {
  width: 100%;
  margin-bottom: 10px;
}

.recording-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.item-error {
  display: none;
  margin-top: 10px;
  padding: 8px 10px;
  background: var(--color-warning-bg);
  color: var(--color-danger);
  border-radius: 8px;
  font-size: 0.85rem;
}
.item-error.visible {
  display: block;
}

/* ===== Compare block ===== */
.compare-wrapper {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--color-border);
}

.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

@media (max-width: 640px) {
  .compare-grid {
    grid-template-columns: 1fr;
  }
}

.compare-col {
  background: #f9fafb;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 10px 12px;
}

.compare-col-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.compare-col-header h4 {
  margin: 0;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--color-muted);
}

.compare-text {
  font-size: 0.92rem;
  word-break: break-word;
}

.diff-same {
  color: var(--color-text);
}
.diff-removed {
  color: var(--color-danger);
  text-decoration: line-through;
  opacity: 0.85;
}
.diff-added {
  color: var(--color-primary);
  font-weight: 600;
}

.diff-legend {
  font-size: 0.75rem;
  color: var(--color-muted);
  margin: 10px 0 0;
}

/* ===== Toasts ===== */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 1000;
  max-width: 320px;
}

.toast {
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 0.85rem;
  color: #fff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  animation: toast-in 0.15s ease-out;
}
.toast-success {
  background: var(--color-success);
}
.toast-error {
  background: var(--color-danger);
}
.toast-info {
  background: #334155;
}

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

@media (max-width: 480px) {
  .app {
    padding: 16px 12px 48px;
  }
  .toast-container {
    left: 12px;
    right: 12px;
    max-width: none;
  }
}