/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    background-color: #f0f2f5;
    color: #333;
    line-height: 1.6;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.9) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.9) 1px, transparent 1px);
    background-size: 20px 20px;
    background-position: -1px -1px;
    position: relative;
}

body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at top right, rgba(26, 82, 118, 0.05) 0%, transparent 40%),
                radial-gradient(circle at bottom left, rgba(52, 152, 219, 0.05) 0%, transparent 40%);
    z-index: -1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
header {
    background: linear-gradient(135deg, #0d2d47 0%, #1a5276 100%);
    color: white;
    padding: 40px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

header::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px),
        linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px);
    background-size: 30px 30px;
    z-index: 1;
}

header::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #1a5276, #3498db, #1a5276);
    z-index: 2;
}

header .container {
    position: relative;
    z-index: 3;
}

h1 {
    font-size: 2.8em;
    font-weight: bold;
    margin-bottom: 10px;
    letter-spacing: 3px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
    position: relative;
    display: inline-block;
}

h1::after {
    content: "";
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, transparent, #3498db, transparent);
}

/* 导航样式 */
nav {
    background-color: white;
    padding: 20px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    border-bottom: 1px solid #e1e8ed;
    position: relative;
    z-index: 100;
}

/* 数据统计卡片 */
.stats-container {
    background: white;
    border-radius: 12px;
    padding: 20px;
    margin: 40px auto;
    max-width: 1000px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    border: 1px solid #e1e8ed;
}

.stats-title {
    text-align: center;
    color: #1a5276;
    font-size: 1.3em;
    font-weight: bold;
    margin-bottom: 20px;
    letter-spacing: 1px;
}

.stats-grid {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    flex-wrap: nowrap;
    width: 100%;
}

.stat-card {
    flex: 1;
    text-align: center;
    padding: 15px 20px;
    border-radius: 8px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border: 1px solid #dee2e6;
    transition: all 0.3s ease;
    min-width: 150px;
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    background: linear-gradient(135deg, #e9ecef 0%, #f8f9fa 100%);
}

.stat-number {
    font-size: 1.8em;
    font-weight: bold;
    color: #1a5276;
    margin-bottom: 5px;
}

.stat-label {
    color: #6c757d;
    font-size: 0.95em;
    font-weight: 500;
}

/* 主要模块样式 */
.main-modules {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 35px;
    margin: 40px auto;
    max-width: 900px;
}

/* 服务列表样式 - 强制每行两个卡片 */
.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin: 40px auto;
    max-width: 1000px;
    width: 100%;
    /* 确保网格布局在所有环境中正常工作 */
    grid-auto-flow: row;
    grid-auto-rows: minmax(0, auto);
}

.service-item {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
    height: 100%;
    /* 确保所有卡片高度一致 */
    display: flex;
    flex-direction: column;
}

.service-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.12);
}

.service-link {
    display: block;
    text-decoration: none;
    color: inherit;
    height: 100%;
    width: 100%;
}

.service-content {
    padding: 30px;
    text-align: center;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

/* 强制保持每行两个卡片布局，无论屏幕尺寸如何 */
@media (min-width: 600px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr) !important;
    }
}

/* 更小屏幕上调整为单列，确保可读性 */
@media (max-width: 599px) {
    .services-grid {
        grid-template-columns: 1fr !important;
    }
}

.module {
    position: relative;
    width: 100%;
    padding-bottom: 100%; /* 正方形比例 */
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.4s ease;
    text-decoration: none;
    box-shadow: 0 6px 20px rgba(0,0,0,0.12);
    background: white;
}

.module::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 50%);
    z-index: 2;
}

.module::after {
    content: "";
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    border-radius: 14px;
    background: linear-gradient(45deg, transparent 48%, rgba(255,255,255,0.2) 50%, transparent 52%);
    background-size: 20px 20px;
    z-index: 1;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.module:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(0,0,0,0.18);
}

.module:hover::after {
    opacity: 1;
}

.module-content {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
    text-align: center;
    padding: 30px;
    z-index: 3;
}

.module-icon-container {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.module:hover .module-icon-container {
    transform: scale(1.1);
    background: rgba(255, 255, 255, 0.25);
}

.module h2 {
    font-size: 2em;
    margin-bottom: 15px;
    text-shadow: 0 3px 6px rgba(0,0,0,0.3);
    font-weight: bold;
    position: relative;
    display: inline-block;
}

.module h2::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 2px;
    background: rgba(255, 255, 255, 0.6);
    transition: width 0.3s ease;
}

.module:hover h2::after {
    width: 50px;
}

.module p {
    font-size: 1.1em;
    opacity: 0.95;
    line-height: 1.5;
    font-weight: 300;
}

.module-stats {
    position: absolute;
    top: 15px;
    right: 15px;
    background: rgba(0, 0, 0, 0.2);
    padding: 5px 12px;
    border-radius: 15px;
    font-size: 0.9em;
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* 模块颜色 - 现代渐变风格 */
.module {
    overflow: visible;
}

.module::after {
    content: '';
    position: absolute;
    inset: -5px;
    z-index: -1;
    border-radius: 18px;
    filter: blur(15px);
    opacity: 0.7;
    transition: opacity 0.4s ease, transform 0.4s ease;
    transform: scale(0.95);
}

.module:hover::after {
    opacity: 0.9;
    transform: scale(1);
}

/* 找成果 - 蓝色渐变 */
#find-results {
    background: linear-gradient(135deg, #165dff 0%, #4080ff 33%, #86aeff 100%);
    position: relative;
    box-shadow: 0 8px 30px rgba(22, 93, 255, 0.3);
}

#find-results::after {
    background: linear-gradient(135deg, #165dff, #4080ff, #86aeff);
}

#find-results::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="20" r="2" fill="rgba(255,255,255,0.3)"/><circle cx="80" cy="60" r="1.5" fill="rgba(255,255,255,0.2)"/><circle cx="20" cy="70" r="1" fill="rgba(255,255,255,0.25)"/></svg>');
    opacity: 0.6;
    z-index: 1;
}

/* 找需求 - 青色渐变 */
#find-demands {
    background: linear-gradient(135deg, #06b6d4 0%, #22d3ee 33%, #67e8f9 100%);
    position: relative;
    box-shadow: 0 8px 30px rgba(6, 182, 212, 0.3);
}

#find-demands::after {
    background: linear-gradient(135deg, #06b6d4, #22d3ee, #67e8f9);
}

#find-demands::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="70" cy="30" r="2" fill="rgba(255,255,255,0.3)"/><circle cx="30" cy="50" r="1.5" fill="rgba(255,255,255,0.2)"/><circle cx="60" cy="80" r="1" fill="rgba(255,255,255,0.25)"/></svg>');
    opacity: 0.6;
    z-index: 1;
}

/* 找服务 - 紫色渐变 */
#find-services {
    background: linear-gradient(135deg, #8b5cf6 0%, #a78bfa 33%, #c4b5fd 100%);
    position: relative;
    box-shadow: 0 8px 30px rgba(139, 92, 246, 0.3);
}

#find-services::after {
    background: linear-gradient(135deg, #8b5cf6, #a78bfa, #c4b5fd);
}

#find-services::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="40" cy="40" r="2" fill="rgba(255,255,255,0.3)"/><circle cx="70" cy="20" r="1.5" fill="rgba(255,255,255,0.2)"/><circle cx="20" cy="80" r="1" fill="rgba(255,255,255,0.25)"/></svg>');
    opacity: 0.6;
    z-index: 1;
}

/* 找专家 - 粉色渐变 */
#find-experts {
    background: linear-gradient(135deg, #ec4899 0%, #f472b6 33%, #f9a8d4 100%);
    position: relative;
    box-shadow: 0 8px 30px rgba(236, 72, 153, 0.3);
}

#find-experts::after {
    background: linear-gradient(135deg, #ec4899, #f472b6, #f9a8d4);
}

#find-experts::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="30" cy="30" r="2" fill="rgba(255,255,255,0.3)"/><circle cx="60" cy="40" r="1.5" fill="rgba(255,255,255,0.2)"/><circle cx="80" cy="70" r="1" fill="rgba(255,255,255,0.25)"/></svg>');
    opacity: 0.6;
    z-index: 1;
}

/* 搜索框样式 */
.search-container {
    background-color: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    margin: 40px 0;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.ai-search {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
}

.ai-search input {
    width: 100%;
    padding: 15px 20px 15px 50px;
    font-size: 16px;
    border: 2px solid #e1e8ed;
    border-radius: 50px;
    outline: none;
    transition: border-color 0.3s ease;
}

.ai-search input:focus {
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.ai-search .search-icon {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #95a5a6;
    font-size: 20px;
}

.ai-search .ai-icon {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #3498db;
    font-size: 20px;
}

/* 成果页面样式 */
.results-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 30px;
}

.result-item {
    background-color: #fff;
    border-radius: 8px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
    border: 2px solid #f1f1f1;
}

.result-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    border-color: #3498db;
}

.result-item h3 {
    color: #1a5276;
    margin-bottom: 15px;
    font-size: 1.4em;
}

/* 需求页面样式 */
.demands-container {
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    overflow: hidden;
    margin-top: 30px;
}

.demand-item {
    display: flex;
    padding: 20px;
    border-bottom: 1px solid #f1f1f1;
    transition: all 0.2s ease;
    cursor: pointer;
    position: relative;
}

.demand-item:hover {
    background-color: #f8f9fa;
    transform: translateX(5px);
}

/* 未读状态增强样式 */
.demand-item.unread {
    background-color: #e8f4f8;
    border-left: 4px solid #3498db;
    padding-left: 16px; /* 调整内边距以保持整体宽度一致 */
}

.demand-item.unread:hover {
    background-color: #d4ebf2;
}

.unread-indicator {
    width: 12px;
    height: 12px;
    background-color: #e74c3c;
    border-radius: 50%;
    margin-right: 15px;
    align-self: center;
    box-shadow: 0 0 0 2px rgba(231, 76, 60, 0.2);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(231, 76, 60, 0.7);
    }
    70% {
        box-shadow: 0 0 0 8px rgba(231, 76, 60, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(231, 76, 60, 0);
    }
}

/* 已读状态样式 */
.demand-item:not(.unread) {
    opacity: 0.9;
}

.demand-content {
    flex: 1;
}

.demand-title {
    font-weight: bold;
    color: #1a5276;
    margin-bottom: 5px;
}

.demand-meta {
    font-size: 0.9em;
    color: #7f8c8d;
}

/* 服务页面样式 */
.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-top: 30px;
}

.service-item {
    position: relative;
    width: 100%;
    padding-bottom: 100%; /* 正方形比例 */
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.service-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.service-content {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
    text-align: center;
    padding: 20px;
    background: linear-gradient(135deg, #1a5276 0%, #3498db 100%);
}

.service-item:nth-child(2) .service-content {
    background: linear-gradient(135deg, #27ae60 0%, #2ecc71 100%);
}

.service-item:nth-child(3) .service-content {
    background: linear-gradient(135deg, #f39c12 0%, #f1c40f 100%);
}

.service-item:nth-child(4) .service-content {
    background: linear-gradient(135deg, #e74c3c 0%, #ec7063 100%);
}

.service-content h3 {
    font-size: 1.6em;
    margin-bottom: 10px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

/* 专家页面样式 */
.experts-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 30px;
}

.expert-item {
    background-color: #fff;
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.expert-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.expert-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background-color: #ecf0f1;
    margin: 0 auto 15px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2em;
    color: #3498db;
}

.expert-name {
    font-weight: bold;
    color: #1a5276;
    margin-bottom: 5px;
}

.expert-title {
    color: #7f8c8d;
    margin-bottom: 10px;
    font-size: 0.9em;
}

/* 页脚样式 */
footer {
    background: linear-gradient(135deg, #0d2d47 0%, #1a5276 100%);
    color: white;
    text-align: center;
    padding: 40px 0;
    margin-top: 80px;
    position: relative;
    overflow: hidden;
}

footer::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #1a5276, #3498db, #1a5276);
}

footer::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 40px 40px;
    z-index: 1;
}

.footer-content {
    max-width: 1000px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.footer-info {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 15px;
    font-size: 0.95em;
    opacity: 0.9;
}

.footer-divider {
    width: 100px;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.5), transparent);
    margin: 10px 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .main-modules {
        grid-template-columns: 1fr;
    }
    
    .results-grid,
    .experts-grid {
        grid-template-columns: 1fr;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    h1 {
        font-size: 2em;
    }
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 按钮样式 */
.btn {
    display: inline-block;
    background-color: #3498db;
    color: white;
    padding: 12px 24px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    transition: background-color 0.3s ease;
    border: none;
    cursor: pointer;
    margin-right: 10px;
}

.btn:last-child {
    margin-right: 0;
}

.btn:hover {
    background-color: #2980b9;
}

.btn-primary {
    background-color: #1a5276;
}

.btn-primary:hover {
    background-color: #154360;
}

.btn-success {
    background-color: #27ae60;
}

.btn-success:hover {
    background-color: #229954;
}

/* 需求列表网格布局 */
.demands-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 28px;
    margin-top: 30px;
}

/* 卡片样式 */
.demand-card {
    display: block;
    background: white;
    border-radius: 16px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    height: 100%;
    border: 1px solid #e8f4f8;
}

.demand-card:hover {
    box-shadow: 0 15px 30px rgba(0,0,0,0.12);
    transform: translateY(-8px);
    border-color: #3498db;
}

.demand-card.unread {
    background-color: #f8fbfd;
    border-left: 5px solid #3498db;
}

.unread-indicator {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background-color: #e74c3c;
    box-shadow: 0 0 0 rgba(231, 76, 60, 0.7);
    animation: pulse 2s infinite;
    z-index: 1;
}

.demand-card:not(.unread) {
    opacity: 0.9;
}

.demand-card-content {
    padding: 28px;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.demand-title {
    font-size: 20px;
    font-weight: 600;
    color: #1a5276;
    margin-bottom: 16px;
    line-height: 1.4;
    position: relative;
    padding-bottom: 12px;
}

.demand-title::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, #3498db, transparent);
}

.company-info {
    color: #2980b9;
    font-weight: 500;
    margin-bottom: 16px;
    font-size: 14px;
    background-color: #ebf5fb;
    padding: 8px 12px;
    border-radius: 6px;
    display: inline-block;
}

.demand-description {
    color: #555;
    margin: 16px 0;
    line-height: 1.7;
    flex: 1;
    font-size: 15px;
}

.demand-meta {
    color: #7f8c8d;
    font-size: 13px;
    margin-top: 16px;
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.demand-meta i {
    font-size: 14px;
    color: #3498db;
}

.card-footer {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid #ecf0f1;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.view-more {
    color: #2980b9;
    font-weight: 500;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    transition: color 0.3s ease;
}

.view-more:hover {
    color: #1a5276;
}

.view-more i {
    margin-left: 8px;
    transition: transform 0.3s ease;
    font-size: 12px;
}

.demand-card:hover .view-more i {
    transform: translateX(5px);
}

/* 搜索容器样式 */
.search-container {
    background: white;
    border-radius: 16px;
    padding: 30px;
    margin-bottom: 25px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    border: 1px solid #e8f4f8;
}

.ai-search {
    position: relative;
    margin: 20px 0;
}

.ai-search input {
    width: 100%;
    padding: 15px 60px 15px 50px;
    border: 2px solid #e1e8ed;
    border-radius: 10px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.ai-search input:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.search-icon, .ai-icon {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 18px;
    color: #7f8c8d;
}

.search-icon {
    left: 20px;
}

.ai-icon {
    right: 20px;
    color: #3498db;
}

/* 脉冲动画 */
@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(231, 76, 60, 0.7);
    }
    70% {
        box-shadow: 0 0 0 12px rgba(231, 76, 60, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(231, 76, 60, 0);
    }
}

/* 响应式调整 */
@media (max-width: 768px) {
    .demands-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .demand-card-content {
        padding: 20px;
    }
    
    .demand-title {
        font-size: 18px;
    }
    
    .search-container {
        padding: 20px;
    }
}