/* 公共样式 - 诺特兰德蛋白粉主题色 */

:root {
    /* 主色调 - 橙色系（诺特兰德品牌色） */
    --primary-color: #FF6B35;
    --primary-light: #FF8C42;
    --primary-lighter: #FFA366;
    --primary-lightest: #FFB88C;
    
    /* 辅助色 - 深蓝色（专业、力量） */
    --secondary-color: #1E3A5F;
    --secondary-light: #2C5282;
    
    /* 中性色 */
    --text-primary: #1A1A1A;
    --text-secondary: #666666;
    --text-light: #999999;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F5F5F5;
    --bg-tertiary: #FAFAFA;
    --border-color: #E0E0E0;
    
    /* 状态色 */
    --success-color: #52C41A;
    --warning-color: #FAAD14;
    --error-color: #FF4D4F;
    --info-color: #1890FF;
    
    /* 阴影 */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    
    /* 间距 */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 顶部导航栏 */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
    padding: var(--spacing-md) 0;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    flex-shrink: 0;
    display: block;
    width: 32px;
    height: 32px;
    min-width: 32px;
    min-height: 32px;
    max-width: 32px;
    max-height: 32px;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
    transition: transform 0.3s ease;
    object-fit: contain;
    vertical-align: middle;
    background: transparent;
}

.logo:hover .logo-icon {
    transform: scale(1.05);
}

.logo h1 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 4px;
    margin: 0;
}

.logo .subtitle {
    font-size: 12px;
    opacity: 0.9;
}

.nav {
    display: flex;
    gap: var(--spacing-md);
}

.nav-item {
    color: white;
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 6px;
    font-weight: 500;
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.nav-item:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.nav-item.active {
    background-color: rgba(255, 255, 255, 0.2);
    font-weight: 600;
}

/* 主内容区 */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    min-height: calc(100vh - 200px); /* 确保内容区域有最小高度 */
}

/* 页面标题 */
.page-header {
    margin-bottom: var(--spacing-xl);
}

.page-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.title-icon {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
}

.page-title h2 {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.page-title p {
    color: var(--text-secondary);
    font-size: 14px;
}

/* 卡片 */
.card {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--border-color);
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

/* 按钮 */
.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    box-shadow: var(--shadow-sm);
    min-height: 40px; /* 确保触摸友好 */
}

.btn-primary:hover {
    opacity: 0.9;
}

.btn-primary:active {
    opacity: 0.8;
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    min-height: 40px; /* 确保触摸友好 */
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--bg-secondary);
}

.btn-secondary:active {
    background: var(--bg-tertiary);
}

.btn-secondary.small {
    padding: 6px var(--spacing-md);
    font-size: 12px;
    min-height: 32px;
}

/* 表单 */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    min-height: 40px; /* 确保触摸友好 */
    background: var(--bg-primary);
}

.form-group 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 var(--spacing-sm) center;
    padding-right: var(--spacing-xl);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(255, 107, 53, 0.15);
    background: var(--bg-primary);
}

/* 表单验证状态 */
.form-group input:invalid:not(:placeholder-shown),
.form-group textarea:invalid:not(:placeholder-shown) {
    border-color: var(--error-color);
}

.form-group input:valid:not(:placeholder-shown),
.form-group textarea:valid:not(:placeholder-shown) {
    border-color: var(--success-color);
}

/* 标签页 */
.input-tabs,
.comparison-tabs {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    background: none;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    min-height: 40px; /* 确保触摸友好 */
}

.tab-btn:hover {
    color: var(--primary-color);
    background: var(--bg-secondary);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    font-weight: 500;
    background: var(--bg-secondary);
}

/* 结果卡片 */
.result-card {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--border-color);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border-color);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.result-header h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.result-badge,
.score-badge {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.result-badge {
    background: var(--bg-secondary);
    color: var(--text-secondary);
}

.score-badge.good {
    background: rgba(82, 196, 26, 0.1);
    color: var(--success-color);
}

.score-badge.excellent {
    background: rgba(24, 144, 255, 0.1);
    color: var(--info-color);
}

/* 操作按钮组 */
.action-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
    justify-content: flex-start;
    align-items: center;
    flex-wrap: wrap;
}

.action-buttons button {
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

/* 导出按钮组（报告导出） */
.export-buttons-group {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-left: var(--spacing-lg);
    position: relative;
}

.export-buttons-group::before {
    content: '';
    position: absolute;
    left: calc(-1 * var(--spacing-md));
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 24px;
    background: var(--border-color);
}

/* 主要操作按钮（查看详细报告）放在最右侧 */
.action-buttons .btn-primary {
    margin-left: auto;
    flex-shrink: 0;
}

/* 页脚 */
.footer {
    background: var(--bg-primary);
    padding: var(--spacing-lg);
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: var(--spacing-xxl);
    border-top: 1px solid var(--border-color);
    box-shadow: 0 -2px 4px rgba(0, 0, 0, 0.05);
}

/* 通用工具类 */
.section-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--border-color);
}

.text-center {
    text-align: center;
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* 可访问性优化 */
button:focus-visible,
a:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: 4px;
}

/* 禁用文本选择（对于按钮和交互元素） */
button,
.btn-primary,
.btn-secondary {
    user-select: none;
    -webkit-user-select: none;
}

/* 确保链接和按钮有足够的点击区域 */
a,
button {
    min-height: 40px;
    min-width: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* 通知系统 */
.toast-container {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    pointer-events: none;
}

.toast {
    min-width: 300px;
    max-width: 400px;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-primary);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--primary-color);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    animation: slideInRight 0.3s ease-out;
    pointer-events: auto;
    position: relative;
}

.toast.success {
    border-left-color: var(--success-color);
}

.toast.error {
    border-left-color: var(--error-color);
}

.toast.warning {
    border-left-color: var(--warning-color);
}

.toast.info {
    border-left-color: var(--info-color);
}

.toast-icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toast-icon svg {
    width: 100%;
    height: 100%;
}

.toast.success .toast-icon {
    color: var(--success-color);
}

.toast.error .toast-icon {
    color: var(--error-color);
}

.toast.warning .toast-icon {
    color: var(--warning-color);
}

.toast.info .toast-icon {
    color: var(--info-color);
}

.toast-content {
    flex: 1;
    font-size: 14px;
    color: var(--text-primary);
    line-height: 1.5;
}

.toast-close {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    border: none;
    background: none;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    border-radius: 4px;
    transition: all 0.2s;
}

.toast-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOutRight {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.toast.hiding {
    animation: slideOutRight 0.3s ease-out forwards;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .main-content {
        padding: var(--spacing-lg);
    }
    
    .header-container {
        padding: 0 var(--spacing-md);
    }
}

@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: flex-start;
    }
    
    .logo {
        width: 100%;
    }
    
    .nav {
        width: 100%;
        flex-wrap: wrap;
        justify-content: flex-start;
        gap: var(--spacing-xs);
    }
    
    .nav-item {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 13px;
    }
    
    .main-content {
        padding: var(--spacing-md);
    }
    
    .page-title {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }
    
    .title-icon {
        margin: 0 auto;
    }
    
    .action-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
        justify-content: flex-start;
    }
    
    .export-buttons-group {
        width: 100%;
        flex-direction: column;
        gap: var(--spacing-sm);
        margin-left: 0;
    }
    
    .export-buttons-group::before {
        display: none;
    }
    
    .action-buttons button,
    .export-buttons-group button {
        width: 100%;
    }
    
    .action-buttons .btn-primary {
        margin-left: 0;
        width: 100%;
        order: -1; /* 在小屏幕上，主要操作按钮放在最前面 */
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 18px;
    }
    
    .logo .subtitle {
        font-size: 11px;
    }
    
    .nav {
        width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .nav-item {
        flex: 1;
        text-align: center;
        font-size: 12px;
        padding: var(--spacing-xs);
        white-space: nowrap;
    }
    
    .page-title h2 {
        font-size: 22px;
    }
    
    .page-title p {
        font-size: 13px;
    }
    
    .card {
        padding: var(--spacing-md);
    }
    
    .result-card {
        padding: var(--spacing-md);
    }
    
    .result-header {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: var(--spacing-sm);
    }
    
    .result-header h4 {
        flex: 1;
        min-width: 0;
    }
    
    .result-badge,
    .score-badge {
        flex-shrink: 0;
        white-space: nowrap;
    }
    
    .form-group input,
    .form-group select,
    .form-group textarea {
        font-size: 16px; /* 防止iOS自动缩放 */
    }
    
    .input-tabs,
    .comparison-tabs {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .tab-btn {
        white-space: nowrap;
        font-size: 13px;
    }
}