/* 营养健康知识图谱问答系统 - H5移动端样式 */

:root {
    --primary: #7B1FA2;
    --primary-light: #9C27B0;
    --primary-lighter: #CE93D8;
    --white: #ffffff;
    --gray-light: #f5f5f5;
    --gray: #999999;
    --dark: #333333;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: linear-gradient(135deg, var(--primary), var(--primary-light), var(--primary-lighter));
    min-height: 100vh;
    color: var(--dark);
}

/* 容器 */
.container {
    max-width: 768px;
    margin: 0 auto;
    padding: 15px;
}

/* 卡片样式 */
.card {
    background: var(--white);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}

.card:active {
    transform: scale(0.98);
}

.card-title {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 10px;
    color: var(--primary);
}

.card-content {
    font-size: 14px;
    line-height: 1.6;
    color: #666;
}

/* 搜索框 */
.search-box {
    background: var(--white);
    border-radius: 25px;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

.search-box input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 16px;
    padding: 5px;
}

.search-box .voice-icon {
    font-size: 24px;
    color: var(--primary);
    margin-left: 10px;
    cursor: pointer;
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 25px;
    border: none;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s;
    text-align: center;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: var(--white);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(123, 31, 162, 0.4);
}

.btn-block {
    display: block;
    width: 100%;
}

/* 表单 */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    color: var(--dark);
    font-weight: 500;
}

.form-input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 16px;
    transition: border-color 0.3s;
}

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

/* 底部导航 */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--white);
    display: flex;
    justify-content: space-around;
    padding: 10px 0;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.nav-item {
    flex: 1;
    text-align: center;
    color: var(--gray);
    text-decoration: none;
    font-size: 12px;
}

.nav-item.active {
    color: var(--primary);
}

.nav-item .icon {
    font-size: 24px;
    display: block;
    margin-bottom: 5px;
}

/* 网格布局 */
.grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

/* 标签 */
.tag {
    display: inline-block;
    padding: 5px 12px;
    background: var(--primary-lighter);
    color: var(--primary);
    border-radius: 15px;
    font-size: 12px;
    margin-right: 8px;
    margin-bottom: 8px;
}

/* 列表项 */
.list-item {
    padding: 15px;
    border-bottom: 1px solid #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.list-item:last-child {
    border-bottom: none;
}

/* 头像 */
.avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--primary-lighter);
}

/* 问答区域 */
.qa-container {
    padding-bottom: 80px;
}

.question-bubble {
    background: var(--primary);
    color: var(--white);
    padding: 15px;
    border-radius: 20px 20px 5px 20px;
    margin-bottom: 15px;
    margin-left: auto;
    max-width: 80%;
}

.answer-bubble {
    background: var(--white);
    padding: 15px;
    border-radius: 20px 20px 20px 5px;
    margin-bottom: 15px;
    max-width: 80%;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

/* 输入区域 */
.input-area {
    position: fixed;
    bottom: 60px;
    left: 15px;
    right: 15px;
    background: var(--white);
    padding: 12px 15px;
    padding-bottom: calc(12px + env(safe-area-inset-bottom));
    display: flex;
    align-items: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    border-radius: 30px;
    z-index: 999;
}

.input-area input {
    flex: 1;
    padding: 10px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 20px;
    margin-right: 10px;
    font-size: 14px;
}

.input-area button {
    padding: 10px 20px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 20px;
    cursor: pointer;
}

/* 响应式调整 */
@media (max-width: 480px) {
    .grid {
        grid-template-columns: 1fr;
    }
    
    .card {
        padding: 15px;
    }
}

/* 加载动画 */
.loading {
    text-align: center;
    padding: 20px;
    color: var(--gray);
}

.spinner {
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto 10px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 提示消息 */
.toast {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 15px 25px;
    border-radius: 10px;
    z-index: 9999;
    display: none;
}

.toast.show {
    display: block;
    animation: fadeInOut 2s;
}

@keyframes fadeInOut {
    0%, 100% { opacity: 0; }
    20%, 80% { opacity: 1; }
}