/**
 * HAMA 表单样式
 * 统一的表单输入、按钮、消息样式
 *
 * 依赖: variables.css
 */

/* ========================================
   表单容器
======================================== */

.form-container {
  max-width: 600px;
  margin: 0 auto;
  padding: var(--space-lg);
}

.form-wide {
  max-width: 800px;
}

/* ========================================
   表单组
======================================== */

.form-group {
  margin-bottom: var(--space-md);
}

.form-group:last-child {
  margin-bottom: 0;
}

/* ========================================
   表单标签
======================================== */

.form-label {
  display: block;
  margin-bottom: var(--space-xs);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-primary);
}

.form-label.required::after {
  content: ' *';
  color: #dc2626;
}

.form-label-hint {
  display: block;
  margin-top: 4px;
  font-size: var(--text-xs);
  font-weight: var(--font-normal);
  color: var(--text-tertiary);
}

/* ========================================
   表单输入框
======================================== */

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  font-size: var(--text-base);
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--bg-light);
  transition: all var(--duration-fast) var(--ease-out);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--nvidia-green);
  box-shadow: 0 0 0 3px var(--nvidia-green-alpha-10);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-tertiary);
}

/* 文本域 */
.form-textarea {
  min-height: 120px;
  resize: vertical;
}

/* 下拉选择 */
.form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
}

/* ========================================
   表单错误状态
======================================== */

.form-field-error {
  border-color: #dc2626 !important;
  box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1) !important;
}

.field-error {
  display: block;
  margin-top: 6px;
  font-size: var(--text-sm);
  color: #dc2626;
}

/* ========================================
   表单按钮
======================================== */

.form-submit {
  width: 100%;
  padding: 14px 32px;
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: white;
  background: linear-gradient(135deg, var(--nvidia-green) 0%, var(--nvidia-green-dark) 100%);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  box-shadow: var(--shadow-green-sm);
}

.form-submit:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-green-md);
}

.form-submit:active:not(:disabled) {
  transform: translateY(0);
}

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

/* 加载状态 */
.btn-loading {
  position: relative;
}

.btn-loading-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  margin-right: 8px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* ========================================
   表单消息
======================================== */

.form-message {
  display: flex;
  align-items: center;
  padding: 14px 18px;
  margin-bottom: var(--space-md);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  animation: slideInDown 0.3s var(--ease-out);
}

@keyframes slideInDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.form-message-fade-out {
  animation: fadeOut 0.3s var(--ease-out) forwards;
}

@keyframes fadeOut {
  to {
    opacity: 0;
    transform: translateY(-5px);
  }
}

.form-message-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  margin-right: 12px;
  font-size: 16px;
  font-weight: bold;
  border-radius: 50%;
  flex-shrink: 0;
}

.form-message-text {
  flex: 1;
}

/* 成功消息 */
.form-message-success {
  background: #f0fdf4;
  border: 1px solid #86efac;
  color: #166534;
}

.form-message-success .form-message-icon {
  background: #86efac;
  color: #166534;
}

/* 错误消息 */
.form-message-error {
  background: #fef2f2;
  border: 1px solid #fca5a5;
  color: #991b1b;
}

.form-message-error .form-message-icon {
  background: #fca5a5;
  color: #991b1b;
}

/* ========================================
   复选框和单选框
======================================== */

.form-checkbox,
.form-radio {
  display: flex;
  align-items: center;
  margin-bottom: var(--space-sm);
  cursor: pointer;
}

.form-checkbox input[type="checkbox"],
.form-radio input[type="radio"] {
  width: 18px;
  height: 18px;
  margin-right: 8px;
  cursor: pointer;
  accent-color: var(--nvidia-green);
}

.form-checkbox label,
.form-radio label {
  font-size: var(--text-base);
  color: var(--text-primary);
  cursor: pointer;
}

/* ========================================
   表单行（两列布局）
======================================== */

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

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

/* ========================================
   隐私协议
======================================== */

.form-privacy {
  margin-top: var(--space-md);
  padding: var(--space-md);
  background: var(--surface-light);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.form-privacy a {
  color: var(--nvidia-green);
  text-decoration: underline;
}

/* ========================================
   表单标题
======================================== */

.form-title {
  margin-bottom: var(--space-md);
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  text-align: center;
}

.form-subtitle {
  margin-bottom: var(--space-lg);
  font-size: var(--text-base);
  color: var(--text-secondary);
  text-align: center;
  line-height: var(--leading-relaxed);
}

/* ========================================
   响应式调整
======================================== */

@media (max-width: 768px) {
  .form-container {
    padding: var(--space-md);
  }

  .form-input,
  .form-textarea,
  .form-select {
    font-size: 16px; /* 防止iOS自动缩放 */
  }

  .form-submit {
    font-size: var(--text-base);
  }
}

/* ========================================
   深色模式支持
======================================== */

@media (prefers-color-scheme: dark) {
  .form-input,
  .form-textarea,
  .form-select {
    background: var(--surface-dark);
    border-color: var(--border-dark);
    color: var(--text-on-dark);
  }

  .form-privacy {
    background: var(--surface-dark);
  }
}