/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    background-color: #f9fafb;
    color: #374151;
    line-height: 1.5;
    min-height: 100vh;
}

/* 容器样式 */
.container {
    max-width: 28rem;
    width: 100%;
    margin: 0 auto;
    padding: 0 1rem;
}

/* 页面布局 */
.page-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem 0;
}

/* 卡片样式 */
.card {
    background: white;
    border-radius: 1rem;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.card-header {
    text-align: center;
    margin-bottom: 1.5rem;
}

.icon-wrapper {
    width: 4rem;
    height: 4rem;
    background: #fee2e2;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

.icon {
    color: #dc2626;
    font-size: 1.5rem;
}

.card-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 0.5rem;
}

.card-subtitle {
    color: #6b7280;
    margin-bottom: 1rem;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
    text-align: center;
}

.btn-primary {
    background-color: #dc2626;
    color: white;
}

.btn-primary:hover {
    background-color: #b91c1c;
}

.btn-full {
    width: 100%;
}

/* 表单样式 */
.form-group {
    margin-bottom: 1rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: #374151;
    margin-bottom: 0.25rem;
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 0.5rem 1rem;
    border: 1px solid #d1d5db;
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: #dc2626;
    box-shadow: 0 0 0 2px rgba(220, 38, 38, 0.2);
}

.form-textarea {
    resize: vertical;
    min-height: 6rem;
}

/* 响应式提示消息 */
.message {
    margin-top: 1rem;
    padding: 0.75rem;
    border-radius: 0.5rem;
    text-align: center;
    font-size: 0.875rem;
}

.message-success {
    background-color: #dcfce7;
    color: #166534;
}

.message-error {
    background-color: #fef2f2;
    color: #991b1b;
}

.message.hidden {
    display: none;
}

/* 响应式设计 */
@media (max-width: 640px) {
    .page-wrapper {
        padding: 1.5rem 0;
    }
    
    .card {
        margin: 0 1rem 1.5rem;
        padding: 1.5rem;
    }
    
    .icon-wrapper {
        width: 3rem;
        height: 3rem;
    }
    
    .icon {
        font-size: 1.25rem;
    }
    
    .card-title {
        font-size: 1.25rem;
    }
}

/* 渐变背景 */
.gradient-bg {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}