/* ============================================================
   Image to Base64 Converter — page layout & component styles
   ============================================================ */

.b64-page {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1rem 3rem;
}

/* Tabs */
.b64-tabs {
  display: flex;
  gap: 0.5rem;
  margin: 2rem 0 1.25rem;
  border-bottom: 1px solid var(--border-color);
}
.b64-tab {
  appearance: none;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 0.75rem 0.25rem;
  margin-bottom: -1px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition);
}
.b64-tab + .b64-tab { margin-left: 1.25rem; }
.b64-tab:hover { color: var(--text-primary); }
.b64-tab.is-active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.b64-tab:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--focus-ring);
  border-radius: 4px;
}

.b64-panel[hidden] { display: none; }

/* Drop zone */
.b64-dropzone {
  border: 2px dashed var(--border-color);
  border-radius: 12px;
  padding: 2.5rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  margin-bottom: 1.25rem;
  user-select: none;
}
.b64-dropzone:hover,
.b64-dropzone:focus,
.b64-dropzone.is-dragover {
  border-color: var(--accent);
  background: var(--accent-light);
  outline: none;
}
.b64-dropzone__inner { pointer-events: none; }
.b64-dropzone__inner .b64-btn { pointer-events: auto; }
.b64-dropzone__icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
  display: block;
}
.b64-dropzone__text {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  margin: 0 0 6px;
}
.b64-dropzone__sub {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin: 0 0 12px;
}

/* File info panel */
.b64-file-info {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  margin-bottom: 1.25rem;
}
.b64-file-info[hidden] { display: none; }
.b64-file-thumb {
  width: 40px;
  height: 40px;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  flex-shrink: 0;
}
.b64-file-meta { flex: 1; min-width: 0; }
.b64-file-name {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 4px;
}
.b64-file-badges { display: flex; gap: 6px; flex-wrap: wrap; }
.b64-badge {
  display: inline-block;
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 600;
  background: var(--bg-hover);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}
.b64-remove-btn {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 0.95rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}
.b64-remove-btn:hover {
  background: rgba(239, 68, 68, 0.1);
  border-color: #ef4444;
  color: #ef4444;
}

/* Messages */
.b64-error {
  padding: 10px 14px;
  border-radius: 8px;
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #ef4444;
  font-size: 0.875rem;
  margin-bottom: 12px;
}
.b64-error[hidden] { display: none; }

/* Output */
.b64-output-wrap[hidden] { display: none; }
.b64-output-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}
.b64-output-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}
.b64-checkbox {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}
.b64-checkbox input { accent-color: var(--accent); margin: 0; }

.b64-output,
.b64-decode-input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  background: var(--bg-input);
  color: var(--text-primary);
  font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
  font-size: 0.8rem;
  line-height: 1.5;
  resize: vertical;
  transition: border-color var(--transition);
}
.b64-output:focus,
.b64-decode-input:focus {
  outline: none;
  border-color: var(--accent);
}

.b64-output-stats {
  display: flex;
  gap: 1.25rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin: 8px 0 14px;
}

/* Buttons */
.b64-btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
  align-items: center;
  margin-bottom: 0.5rem;
}
.b64-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  height: 40px;
  padding: 0 1.25rem;
  border-radius: 10px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: background var(--transition), color var(--transition),
              border-color var(--transition), box-shadow var(--transition), opacity var(--transition);
}
.b64-btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--focus-ring);
}
.b64-btn--primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.b64-btn--primary:hover { background: #1d4ed8; border-color: #1d4ed8; }
.b64-btn--secondary {
  background: var(--bg-card);
  color: var(--accent);
  border-color: var(--accent);
}
.b64-btn--secondary:hover { background: var(--accent-light); }
.b64-btn--ghost {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border-color);
}
.b64-btn--ghost:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-light); }
.b64-btn--small {
  height: 32px;
  padding: 0 0.9rem;
  font-size: 0.8rem;
}
.b64-btn:disabled { opacity: 0.45; cursor: not-allowed; }
.b64-btn.is-copied { background: #16a34a; border-color: #16a34a; color: #fff; }

/* Privacy note */
.b64-privacy-note {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin: 0.9rem 0 0;
}

/* Decode preview */
.b64-decode-preview[hidden] { display: none; }
.b64-decode-preview {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-color);
}
.b64-preview-title {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 0.75rem;
  color: var(--text-primary);
}
.b64-preview-img {
  display: block;
  max-width: 100%;
  max-height: 320px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  margin-bottom: 1rem;
}

/* How It Works */
.b64-how-section { margin: 2.5rem 0; }
.b64-how-section h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 0 1rem;
  color: var(--text-primary);
}
.b64-how-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.b64-how-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.25rem;
}
.b64-how-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.b64-how-card strong {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.3rem;
}
.b64-how-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.55;
}

/* FAQ */
.b64-faq { margin-bottom: 3rem; }
.b64-faq h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 0 0.25rem;
  color: var(--text-primary);
}
.b64-faq__item {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin-bottom: 8px;
  overflow: hidden;
}
.b64-faq__item summary {
  padding: 12px 16px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}
.b64-faq__item summary::-webkit-details-marker { display: none; }
.b64-faq__item summary::after {
  content: '+';
  font-size: 1.1rem;
  color: var(--text-secondary);
  flex-shrink: 0;
  margin-left: 8px;
  transition: transform var(--transition);
}
.b64-faq__item[open] summary::after { transform: rotate(45deg); }
.b64-faq__item p {
  padding: 0 16px 14px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* Responsive */
@media (max-width: 540px) {
  .b64-how-grid { grid-template-columns: 1fr; }
  .b64-btn-row { flex-direction: column; align-items: stretch; }
  .b64-btn { width: 100%; }
  .b64-output-stats { flex-direction: column; gap: 4px; }
}