/**
 * Base64 编码解码工具样式
 * 独立于博客主题，仅作用于 #b64-app 容器。
 * 暗色模式适配 Chirpy 的 html[mode=dark] 属性 + 系统偏好。
 */

#b64-app {
  --b64-border: rgba(128, 128, 128, 0.35);
  --b64-border-strong: rgba(128, 128, 128, 0.55);
  --b64-bg: rgba(128, 128, 128, 0.07);
  --b64-bg-hover: rgba(128, 128, 128, 0.14);
  --b64-text: inherit;
  --b64-text-muted: rgba(128, 128, 128, 0.95);
  --b64-accent: #2f6fde;
  --b64-accent-text: #fff;
  --b64-ok: #1a7f4b;
  --b64-warn: #a05c00;
  --b64-err: #c0392b;
  --b64-radius: 8px;
}

html[mode='dark'] #b64-app {
  --b64-bg: rgba(255, 255, 255, 0.06);
  --b64-bg-hover: rgba(255, 255, 255, 0.12);
  --b64-text-muted: rgba(190, 190, 190, 0.95);
  --b64-accent: #5b8ff0;
  --b64-ok: #57c288;
  --b64-warn: #e0a94e;
  --b64-err: #e2735f;
}

@media (prefers-color-scheme: dark) {
  html:not([mode='light']) #b64-app {
    --b64-bg: rgba(255, 255, 255, 0.06);
    --b64-bg-hover: rgba(255, 255, 255, 0.12);
    --b64-text-muted: rgba(190, 190, 190, 0.95);
    --b64-accent: #5b8ff0;
    --b64-ok: #57c288;
    --b64-warn: #e0a94e;
    --b64-err: #e2735f;
  }
}

#b64-app .b64-banner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1rem;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

#b64-app .b64-hint {
  color: var(--b64-text-muted);
}

#b64-app .b64-input-wrap,
#b64-app .b64-options,
#b64-app .b64-actions {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin: 0.8rem 0;
  padding: 0.8rem 1rem;
  border: 1px solid var(--b64-border);
  border-radius: var(--b64-radius);
  background: var(--b64-bg);
}

#b64-app .b64-label {
  font-size: 0.85rem;
  color: var(--b64-text-muted);
  margin: 0;
}

#b64-app .b64-input {
  width: 100%;
  min-height: 96px;
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--b64-border-strong);
  border-radius: 6px;
  background: transparent;
  color: inherit;
  font-size: 0.95rem;
  font-family: inherit;
  line-height: 1.5;
  resize: vertical;
  transition: border-color 0.15s ease;
}

#b64-app .b64-input:focus {
  outline: none;
  border-color: var(--b64-accent);
}

#b64-app .b64-input::placeholder {
  color: var(--b64-text-muted);
  opacity: 0.7;
}

#b64-app .b64-options label {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  margin: 0;
  cursor: pointer;
}

#b64-app .b64-options input[type='checkbox'] {
  accent-color: var(--b64-accent);
}

#b64-app .b64-options code {
  background: var(--b64-bg-hover);
  border-radius: 4px;
  padding: 0 0.25rem;
}

#b64-app .b64-actions {
  flex-direction: row;
  flex-wrap: wrap;
  gap: 0.5rem;
}

#b64-app .b64-btn {
  padding: 0.4rem 1.1rem;
  border: 1px solid var(--b64-border-strong);
  border-radius: 6px;
  background: transparent;
  color: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

#b64-app .b64-btn:hover:not(:disabled) { background: var(--b64-bg-hover); }
#b64-app .b64-btn:disabled { opacity: 0.45; cursor: not-allowed; }

#b64-app .b64-btn-primary { min-width: 6.5rem; font-weight: 500; }

#b64-app .b64-btn-active,
#b64-app .b64-btn-primary:active {
  background: var(--b64-accent);
  border-color: var(--b64-accent);
  color: var(--b64-accent-text);
}

#b64-app .b64-btn-copy {
  flex: none;
  font-size: 0.82rem;
}

#b64-app .b64-btn-copy.b64-copied {
  color: var(--b64-ok);
  border-color: var(--b64-ok);
}

#b64-app .b64-placeholder {
  padding: 1.6rem 1rem;
  border: 1px dashed var(--b64-border-strong);
  border-radius: var(--b64-radius);
  text-align: center;
  font-size: 0.9rem;
  color: var(--b64-text-muted);
}

#b64-app .b64-output {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0.8rem 1rem;
  border: 1px solid var(--b64-border);
  border-radius: var(--b64-radius);
  background: var(--b64-bg);
}

#b64-app .b64-output[hidden],
#b64-app .b64-error[hidden] {
  display: none;
}

#b64-app .b64-result {
  min-height: 96px;
  margin: 0;
  word-break: break-all;
  user-select: all;
}

#b64-app .b64-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

#b64-app .b64-meta {
  font-size: 0.82rem;
  color: var(--b64-text-muted);
}

#b64-app .b64-error {
  padding: 0.7rem 1rem;
  border: 1px solid var(--b64-err);
  border-radius: var(--b64-radius);
  color: var(--b64-err);
  font-size: 0.88rem;
}

@media (max-width: 576px) {
  #b64-app .b64-meta-row {
    flex-direction: column;
    align-items: flex-start;
  }
  #b64-app .b64-btn-copy { margin-left: auto; }
}