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

:root {
    /* 飞书风格配色 - 科技蓝主题 */
    --primary-blue: #3370FF;
    --primary-blue-hover: #245FEB;
    --primary-blue-light: #F2F3FF;
    --primary-blue-lighter: #F7F8FF;
    
    /* 背景色 */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F7F8FA;
    --bg-tertiary: #F2F3F5;
    --bg-card: #FFFFFF;
    
    /* 文字颜色 */
    --text-primary: #1D2129;
    --text-secondary: #4E5969;
    --text-tertiary: #86909C;
    --text-disabled: #C9CDD4;
    
    /* 边框颜色 */
    --border-color: #E5E6EB;
    --border-light: #F2F3F5;
    --border-focus: #3370FF;
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    
    /* 状态颜色 */
    --success-color: #00D26A;
    --error-color: #F53F3F;
    --warning-color: #FF7D00;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg-secondary);
    min-height: 100vh;
    padding: 0;
    margin: 0;
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: var(--bg-primary);
    padding: 32px 40px;
    min-height: 100vh;
}

header {
    text-align: center;
    margin-bottom: 40px;
    position: relative;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
}

header h1 {
    font-size: 2.2em;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, #4E8CFF 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1em;
    font-weight: 400;
    letter-spacing: 0.01em;
}

.btn-back {
    position: absolute;
    top: 0;
    left: 0;
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.btn-back:hover {
    background: var(--primary-blue-light);
    border-color: var(--primary-blue);
    color: var(--primary-blue);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.menu {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.menu-card {
    background: var(--bg-card);
    color: var(--text-primary);
    padding: 28px 24px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: center;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.menu-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--primary-blue), transparent);
    opacity: 0;
    transition: opacity 0.3s;
}

.menu-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-blue);
    background: var(--primary-blue-lighter);
}

.menu-card:hover::before {
    opacity: 1;
}

.menu-icon {
    font-size: 3em;
    margin-bottom: 16px;
    opacity: 0.9;
    transition: all 0.3s;
    filter: grayscale(0%);
}

.menu-card:hover .menu-icon {
    opacity: 1;
    transform: scale(1.05);
}

.menu-card h2 {
    margin-bottom: 12px;
    font-size: 1.4em;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--text-primary);
}

.menu-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.95em;
}

.form-section {
    margin-bottom: 24px;
    padding: 24px;
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.form-section h2 {
    color: var(--text-primary);
    margin-bottom: 20px;
    font-size: 1.4em;
    font-weight: 600;
    letter-spacing: -0.01em;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.9em;
    letter-spacing: 0.01em;
}

.form-control,
input[type="text"],
input[type="number"],
textarea,
select {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    color: var(--text-primary);
    transition: all 0.2s ease;
    font-family: inherit;
}

.form-control:focus,
input[type="text"]:focus,
input[type="number"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--primary-blue);
    background: var(--bg-primary);
    box-shadow: 0 0 0 3px var(--primary-blue-light);
}

textarea {
    resize: vertical;
    min-height: 100px;
    line-height: 1.6;
}

.btn {
    padding: 12px 24px;
    border: 1px solid transparent;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
    margin-right: 12px;
    letter-spacing: 0.01em;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-primary {
    background: var(--primary-blue);
    color: #FFFFFF;
    border-color: var(--primary-blue);
}

.btn-primary:hover {
    background: var(--primary-blue-hover);
    border-color: var(--primary-blue-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-success {
    background: var(--primary-blue);
    color: #FFFFFF;
    border-color: var(--primary-blue);
}

.btn-success:hover {
    background: var(--primary-blue-hover);
    border-color: var(--primary-blue-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--border-color);
    box-shadow: var(--shadow-sm);
}

.form-actions {
    margin-top: 24px;
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.question-item {
    background: var(--bg-card);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.question-item:hover {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-md);
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.question-header h3 {
    color: var(--text-primary);
    font-size: 1.2em;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.btn-danger {
    background: var(--bg-primary);
    color: var(--error-color);
    padding: 8px 16px;
    font-size: 13px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-danger:hover {
    background: #FFF1F0;
    border-color: var(--error-color);
    color: var(--error-color);
}

.option-item {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
}

.option-item:hover {
    background: var(--primary-blue-light);
    border-color: var(--primary-blue);
}

.option-item input {
    width: auto;
    margin-right: 12px;
    accent-color: var(--primary-blue);
}

.option-item label {
    flex: 1;
    margin: 0;
    color: var(--text-primary);
    cursor: pointer;
    font-weight: 400;
}

.keyword-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 12px;
}

.keyword-tag {
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: 10px 20px;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 14px;
    border: 1px solid var(--border-color);
    font-weight: 400;
}

.keyword-tag:hover {
    background: var(--primary-blue-light);
    border-color: var(--primary-blue);
    color: var(--primary-blue);
    transform: translateY(-1px);
}

.keyword-tag.selected {
    background: var(--primary-blue);
    color: #FFFFFF;
    border-color: var(--primary-blue);
}

.questionnaire-list {
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.questionnaire-list h2 {
    color: var(--text-primary);
    margin-bottom: 20px;
    font-weight: 600;
    font-size: 1.4em;
    letter-spacing: -0.01em;
}

.questionnaire-item {
    background: var(--bg-card);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 16px;
    transition: all 0.2s ease;
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    box-shadow: var(--shadow-sm);
}

.questionnaire-item:hover {
    background: var(--primary-blue-lighter);
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.questionnaire-content {
    flex: 1;
    cursor: pointer;
}

.questionnaire-item h3 {
    color: var(--text-primary);
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 1.2em;
}

.questionnaire-item p {
    color: var(--text-secondary);
    margin-bottom: 6px;
    font-size: 0.95em;
}

.questionnaire-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.answer-item {
    background: var(--bg-card);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
    border-left: 4px solid var(--primary-blue);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary-blue);
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.answer-item:hover {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-md);
}

.answer-item h3 {
    color: var(--text-primary);
    margin-bottom: 12px;
    font-weight: 600;
    font-size: 1.2em;
}

.answer-item .answer-content {
    background: var(--bg-secondary);
    padding: 16px;
    border-radius: 8px;
    margin-top: 12px;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    line-height: 1.7;
}

.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
    font-size: 1.1em;
}

.error {
    background: #FFF1F0;
    color: var(--error-color);
    padding: 16px 20px;
    border-radius: 8px;
    margin-bottom: 24px;
    border: 1px solid #FFE5E5;
    border-left: 4px solid var(--error-color);
}

.success {
    background: #F0FFF4;
    color: var(--success-color);
    padding: 16px 20px;
    border-radius: 8px;
    margin-bottom: 24px;
    border: 1px solid #E5FFED;
    border-left: 4px solid var(--success-color);
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* 选择文本样式 */
::selection {
    background: var(--primary-blue-light);
    color: var(--primary-blue);
}

/* 调研看板 */
.dashboard-summary .summary-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    margin-bottom: 12px;
    color: var(--text-secondary);
    font-size: 0.95em;
}
.dashboard-summary .stat-item strong {
    color: var(--primary-blue);
}
.survey-desc {
    color: var(--text-secondary);
    font-size: 0.9em;
    line-height: 1.6;
    margin-top: 8px;
}
.table-wrapper {
    overflow-x: auto;
    margin-top: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-primary);
}
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
    min-width: 600px;
}
.data-table th,
.data-table td {
    padding: 12px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    vertical-align: top;
    max-width: 320px;
    word-break: break-word;
}
.data-table th {
    background: var(--bg-secondary);
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
}
.data-table tbody tr:hover {
    background: var(--primary-blue-lighter);
}
.data-table td:first-child {
    font-weight: 500;
    color: var(--text-secondary);
}
.table-hint,
.empty-hint {
    color: var(--text-tertiary);
    font-size: 0.9em;
    margin-top: 12px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 20px 16px;
    }

    header h1 {
        font-size: 1.8em;
    }

    .menu {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .menu-card {
        padding: 24px 20px;
    }
}