/* 全局样式 */
:root {
    --primary-color: #4a6baf;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --font-family: 'Helvetica Neue', Arial, sans-serif;
}

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

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 导航栏 */
.navbar {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.navbar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: white;
    text-decoration: none;
}

.navbar-nav {
    display: flex;
    list-style: none;
}

.nav-item {
    margin-left: 1.5rem;
}

.nav-link {
    color: white;
    text-decoration: none;
    transition: opacity 0.3s;
}

.nav-link:hover {
    opacity: 0.8;
}

/* 按钮 */
.btn {
    display: inline-block;
    font-weight: 400;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    user-select: none;
    border: 1px solid transparent;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: 0.25rem;
    transition: all 0.15s ease-in-out;
    cursor: pointer;
    text-decoration: none;
}

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

.btn-primary:hover {
    background-color: #3a559c;
    border-color: #3a559c;
}

.btn-secondary {
    color: #fff;
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
}

.btn-success {
    color: #fff;
    background-color: var(--success-color);
    border-color: var(--success-color);
}

.btn-danger {
    color: #fff;
    background-color: var(--danger-color);
    border-color: var(--danger-color);
}

.btn-info {
    color: #fff;
    background-color: var(--info-color);
    border-color: var(--info-color);
}

.btn-info:hover {
    background-color: #138496;
    border-color: #117a8b;
}

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
    line-height: 1.5;
    border-radius: 0.2rem;
}

/* 卡片 */
.card {
    position: relative;
    display: flex;
    flex-direction: column;
    min-width: 0;
    word-wrap: break-word;
    background-color: #fff;
    background-clip: border-box;
    border: 1px solid rgba(0, 0, 0, 0.125);
    border-radius: 0.25rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.card-header {
    padding: 0.75rem 1.25rem;
    margin-bottom: 0;
    background-color: rgba(0, 0, 0, 0.03);
    border-bottom: 1px solid rgba(0, 0, 0, 0.125);
}

.card-body {
    flex: 1 1 auto;
    padding: 1.25rem;
}

.card-title {
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

.card-text {
    margin-bottom: 1rem;
}

.card-footer {
    padding: 0.75rem 1.25rem;
    background-color: rgba(0, 0, 0, 0.03);
    border-top: 1px solid rgba(0, 0, 0, 0.125);
}

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

.form-label {
    display: inline-block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-control {
    display: block;
    width: 100%;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    color: #495057;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid #ced4da;
    border-radius: 0.25rem;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus {
    color: #495057;
    background-color: #fff;
    border-color: #80bdff;
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.form-text {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: #6c757d;
}

.form-check {
    position: relative;
    display: block;
    padding-left: 1.25rem;
    margin-bottom: 0.5rem;
}

.form-check-input {
    position: absolute;
    margin-top: 0.3rem;
    margin-left: -1.25rem;
}

.form-check-label {
    margin-bottom: 0;
}

/* 问卷样式 */
.survey-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.survey-item {
    height: 100%;
}

.question-container {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background-color: #fff;
    border-radius: 0.5rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.question-title {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.question-required {
    color: var(--danger-color);
    margin-left: 0.25rem;
}

.options-list {
    list-style: none;
    margin-top: 0.5rem;
}

.option-item {
    margin-bottom: 0.5rem;
}

/* 评分题样式 */
.rating-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.rating-option {
    display: inline-block;
    width: 2.5rem;
    height: 2.5rem;
    line-height: 2.5rem;
    text-align: center;
    border: 1px solid #ddd;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s;
}

.rating-option:hover, .rating-option.selected {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* 统计结果样式 */
.result-container {
    margin-bottom: 2.5rem;
}

.progress {
    display: flex;
    height: 1.5rem;
    overflow: hidden;
    font-size: 0.75rem;
    background-color: #e9ecef;
    border-radius: 0.25rem;
    margin-top: 0.5rem;
    margin-bottom: 0.25rem;
}

.progress-bar {
    display: flex;
    flex-direction: column;
    justify-content: center;
    color: #fff;
    text-align: center;
    white-space: nowrap;
    background-color: var(--primary-color);
    transition: width 0.6s ease;
}

.text-answers {
    background-color: #f8f9fa;
    border-left: 3px solid var(--primary-color);
    padding: 0.75rem;
    margin-top: 0.5rem;
    border-radius: 0 0.25rem 0.25rem 0;
}

.text-answer-item {
    margin-bottom: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid #eee;
}

.text-answer-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar-container {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .navbar-nav {
        margin-top: 1rem;
        flex-direction: column;
    }
    
    .nav-item {
        margin-left: 0;
        margin-bottom: 0.5rem;
    }
    
    .survey-list {
        grid-template-columns: 1fr;
    }
    
    .rating-container {
        justify-content: center;
    }
}

/* 辅助类 */
.text-center {
    text-align: center;
}

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 3rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 3rem; }

.ml-1 { margin-left: 0.25rem; }
.ml-2 { margin-left: 0.5rem; }
.ml-3 { margin-left: 1rem; }

.mr-1 { margin-right: 0.25rem; }
.mr-2 { margin-right: 0.5rem; }
.mr-3 { margin-right: 1rem; }

.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 1rem; }
.p-4 { padding: 1.5rem; }
.p-5 { padding: 3rem; }

.alert {
    position: relative;
    padding: 0.75rem 1.25rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: 0.25rem;
}

.alert-success {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
}

.alert-danger {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

.alert-warning {
    color: #856404;
    background-color: #fff3cd;
    border-color: #ffeeba;
}

.alert-info {
    color: #0c5460;
    background-color: #d1ecf1;
    border-color: #bee5eb;
}