/* ==========================================================================
   组件 -- 按钮 / 卡片 / 表单 / 结果区 / chip / toast / loading
   严格遵循 DESIGN.md：胶囊主按钮、18px 卡片、单一落影不上 chrome
   ========================================================================== */

/* ---- 主按钮：Action Blue 胶囊 ---- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-family: var(--font-text);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.47;
  letter-spacing: -0.374px;
  border-radius: var(--rounded-pill);
  padding: 11px 22px;
  min-height: 44px;            /* 触控目标 */
  transition: transform var(--transition-fast);
  user-select: none;
  white-space: nowrap;
}

.btn-primary:active {
  transform: scale(0.95);      /* 全系统统一微动 */
}

.btn-primary:focus-visible {
  outline: 2px solid var(--color-primary-focus);
  outline-offset: 2px;
}

.btn-primary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

/* ---- 次级幽灵按钮：透明 + Action Blue 描边 ---- */
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  background: transparent;
  color: var(--color-primary);
  font-family: var(--font-text);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.47;
  letter-spacing: -0.374px;
  border: 1px solid var(--color-primary);
  border-radius: var(--rounded-pill);
  padding: 10px 22px;
  min-height: 44px;
  transition: transform var(--transition-fast);
  white-space: nowrap;
}

.btn-secondary:active {
  transform: scale(0.95);
}

.btn-secondary:focus-visible {
  outline: 2px solid var(--color-primary-focus);
  outline-offset: 2px;
}

/* ---- 工具按钮：8px 圆角，紧凑 ---- */
.btn-utility {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  background: var(--color-surface-pearl);
  color: var(--color-ink-muted-80);
  font-family: var(--font-text);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.29;
  letter-spacing: -0.224px;
  border: 1px solid var(--color-divider-soft);
  border-radius: var(--rounded-sm);
  padding: 8px 15px;
  min-height: 36px;
  transition: transform var(--transition-fast);
}

.btn-utility:active {
  transform: scale(0.95);
}

.btn-utility:focus-visible {
  outline: 2px solid var(--color-primary-focus);
  outline-offset: 2px;
}

/* ---- 工具卡：白底 + 发丝边 + 18px 圆角 ---- */
.card {
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--rounded-lg);
  padding: var(--spacing-lg);
}

.card + .card {
  margin-top: var(--spacing-lg);
}

.card__label {
  font-family: var(--font-text);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.29;
  letter-spacing: -0.224px;
  color: var(--color-ink-muted-80);
  margin-bottom: var(--spacing-sm);
  display: block;
}

/* ---- 表单：输入框 / textarea ---- */
.field {
  margin-bottom: var(--spacing-md);
}

.field:last-child {
  margin-bottom: 0;
}

.input,
.textarea {
  width: 100%;
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-text);
  font-size: 17px;
  line-height: 1.47;
  letter-spacing: -0.374px;
  border: 1px solid var(--color-hairline);
  border-radius: var(--rounded-sm);
  padding: 10px 14px;
  transition: border-color var(--transition-fast);
}

.input {
  height: 44px;
}

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

.input::placeholder,
.textarea::placeholder {
  color: var(--color-ink-muted-48);
}

/* textarea 风格：等宽、最小高度 */
.textarea {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.5;
  min-height: 180px;
  resize: vertical;
}

.textarea--tall {
  min-height: 280px;
}

/* ---- 选项 chip：胶囊，选中描边升级 ---- */
.chip-group {
  display: inline-flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.chip {
  display: inline-flex;
  align-items: center;
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-text);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.43;
  letter-spacing: -0.224px;
  border: 1px solid var(--color-hairline);
  border-radius: var(--rounded-pill);
  padding: 10px 16px;
  min-height: 36px;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.chip:active {
  transform: scale(0.95);
}

.chip--selected {
  border: 2px solid var(--color-primary-focus);
  padding: 9px 15px;          /* 抵消 2px 边框 */
  color: var(--color-primary);
  font-weight: 600;
}

/* ---- 表单操作行 ---- */
.form-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
  flex-wrap: wrap;
}

/* ---- 结果区：等宽、羊皮纸底、可滚动 ---- */
.result {
  background: var(--color-canvas-parchment);
  border: 1px solid var(--color-divider-soft);
  border-radius: var(--rounded-sm);
  padding: var(--spacing-md);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  color: var(--color-ink);
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 560px;
  overflow: auto;
}

.result--empty {
  color: var(--color-ink-muted-48);
  font-style: normal;
  white-space: normal;
}

.result__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-sm);
}

.result__title {
  font-family: var(--font-text);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.224px;
  color: var(--color-ink-muted-80);
}

/* ---- loading 转圈（仅用于按钮内） ---- */
.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: var(--color-on-primary);
  border-radius: var(--rounded-full);
  animation: spin 0.7s linear infinite;
}

.spinner--dark {
  border-color: rgba(0, 0, 0, 0.15);
  border-top-color: var(--color-ink);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ---- toast：底部居中浮层 ---- */
.toast-stack {
  position: fixed;
  left: 50%;
  bottom: var(--spacing-lg);
  transform: translateX(-50%);
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  align-items: center;
  pointer-events: none;
}

.toast {
  background: var(--color-surface-tile-1);
  color: var(--color-body-on-dark);
  font-family: var(--font-text);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.43;
  letter-spacing: -0.224px;
  border-radius: var(--rounded-md);
  padding: 10px 16px;
  max-width: min(90vw, 480px);
  box-shadow: var(--shadow-product); /* 浮层提示借用唯一落影 */
  animation: toast-in var(--transition-fast);
}

.toast--error {
  background: var(--color-surface-tile-3);
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---- 工具页空状态 ---- */
.empty-hint {
  color: var(--color-ink-muted-48);
  font-size: 14px;
  line-height: 1.43;
}

@media (max-width: 640px) {
  .card {
    padding: var(--spacing-md);
  }
  .form-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .form-actions .btn-primary,
  .form-actions .btn-secondary {
    width: 100%;
  }
}