:root{
    --primary:#1a3a6c;
    --secondary:#2c5282;
    --accent:#4c7db5;
    --light:#f0f4f8;
    --dark:#0d1b2a;
    --gray:#718096;
    --light-gray:#e2e8f0;
    --white:#ffffff;
    --warning:#e67e22;
    --lang-bg:#f8fafc;
    --success:#165DFF;
    --radius:12px;
    --shadow:0 5px 20px rgba(0,0,0,0.06);
    --shadow-hover:0 12px 30px rgba(0,0,0,0.1);
}
*{margin:0;padding:0;box-sizing:border-box;font-family:'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;}
body{background:var(--light);color:var(--dark);line-height:1.6;}
.container{max-width:1200px;margin:0 auto;padding:0 20px;}

/* 顶部标题区 完全统一 */
.app-header {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 60px 0;
    text-align: center;
    margin-bottom: 60px;
}
.app-header h1 {
    font-size: 2.8rem;
    margin-bottom: 15px;
    font-weight: 700;
}
.app-header p {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 700px;
    margin: 0 auto;
}

/* 筛选按钮统一 */
.app-filter {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 50px;
    flex-wrap: wrap;
}
.filter-btn {
    padding: 10px 24px;
    background: var(--white);
    border: 1px solid var(--light-gray);
    border-radius: 6px;
    color: var(--dark);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display:flex;
    align-items:center;
    gap:8px;
    font-size:14px;
}
.filter-btn:hover, .filter-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}
.filter-btn i{font-size:16px;}

/* 案例卡片统一尺寸 */
.case-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-bottom: 80px;
}
.case-item {
    background: white;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    overflow: hidden;
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    height: 100%;
}
.case-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}
.case-item-img {
    height: 200px;
    overflow: hidden;
    position: relative;
    border-radius: var(--radius) var(--radius) 0 0;
}
.case-item-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}
.case-item:hover .case-item-img img {
    transform: scale(1.05);
}
.case-item-tag {
    position: absolute;
    top: 15px;
    left: 15px;
    background: var(--success);
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    z-index: 2;
}
.case-item-content {
    padding: 30px;
    display: flex;
    flex-direction: column;
    flex: 1;
}
.case-item-location {
    color: var(--primary);
    font-size: 14px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 5px;
    font-weight:500;
}
.case-item-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 15px;
    line-height: 1.4;
    transition: color 0.3s ease;
}
.case-item:hover .case-item-title {
    color: var(--primary);
}
.case-item-desc {
    color: var(--gray);
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
    display:-webkit-box;
    -webkit-line-clamp:3;
    -webkit-box-orient:vertical;
    overflow:hidden;
    flex-grow: 1;
}
.case-params {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}
.param-tag {
    background: var(--light);
    color: var(--primary);
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
}
.case-item-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 14px 0;
    background: var(--primary);
    color: #fff;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    border: 1px solid var(--primary);
    font-size: 16px;
    margin-top: auto;
}
.case-item-link:hover {
    background: #fff;
    color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(26, 58, 108, 0.2);
}

/* 弹窗统一样式 */
.modal{
    position:fixed;
    top:0;
    left:0;
    width:100%;
    height:100%;
    background:rgba(0,0,0,0.85);
    z-index:9999;
    display:none;
    align-items:center;
    justify-content:center;
    padding:20px;
    backdrop-filter:blur(4px);
}
.modal.show{display:flex;}

.modal-content{
    background:var(--white);
    border-radius:var(--radius);
    width:100%;
    max-width:900px;
    max-height:90vh;
    box-shadow:0 5px 30px rgba(0,0,0,0.08);
    position:relative;
    animation:modalFadeIn 0.3s ease;
    overflow: hidden;
}
.modal-scroll-body {
    max-height: 90vh;
    overflow-y: auto;
    padding:40px;
}
.modal-scroll-body::-webkit-scrollbar {
    width: 6px;
}
.modal-scroll-body::-webkit-scrollbar-thumb {
    background: var(--light-gray);
    border-radius: 6px;
}
.modal-scroll-body::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

@keyframes modalFadeIn{
    from{opacity:0;transform:translateY(20px);}
    to{opacity:1;transform:translateY(0);}
}
.modal-close{
    position:absolute;
    top:12px;
    right:12px;
    width:36px;
    height:36px;
    border-radius:50%;
    background:rgba(0,0,0,0.5);
    border:none;
    cursor:pointer;
    display:flex;
    align-items:center;
    justify-content:center;
    font-size:16px;
    color:#fff;
    transition:all 0.3s;
    z-index:10;
}
.modal-close:hover{
    background:#ff3a3a;
    color:#fff;
}
.modal-body{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:32px;
}
.modal-gallery { 
    position: relative; 
}
.modal-img{
    width:100%;
    height:450px;
    object-fit:cover;
    border-radius:12px;
}

.gallery-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 100%;
    background: transparent !important;
    border: none !important;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: rgba(255,255,255,1);
    text-shadow: 0 1px 5px rgba(0,0,0,0.3);
    transition: all 0.2s ease;
    z-index: 5;
}
.gallery-btn i {
    transition: transform 0.2s ease;
}
.gallery-btn:hover i {
    transform: scale(1.2);
    color: #ffffff;
}
.gallery-prev { left: 0px; }
.gallery-next { right: 0px; }

.modal-gallery-nav {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 12px;
}
.gallery-dot {
    width: 10px;
    height: 10px;
    background: #ccc;
    border-radius: 50%;
    cursor: pointer;
}
.gallery-dot.active { background: var(--primary); }

.modal-info h3{
    font-size: 1.4rem;
    color:var(--secondary);
    margin-bottom:15px;
    line-height:1.4;
    font-weight:600;
}
.modal-location{
    color:var(--primary);
    font-size:14px;
    margin-bottom:16px;
    display:flex;
    align-items:center;
    gap:5px;
    font-weight:500;
}
.modal-desc{
    color:var(--gray);
    line-height:1.8;
    font-size:14px;
    margin-bottom:20px;
}
.modal-params{
    display:flex;
    gap:8px;
    flex-wrap:wrap;
    margin-bottom:24px;
}
.modal-category{
    display:inline-block;
    background:var(--success);
    color:#fff;
    padding:5px 12px;
    border-radius:20px;
    font-size:12px;
    font-weight:600;
    margin-bottom:16px;
}

/* 响应式完全统一 */
@media (max-width: 992px) {
    .app-header h1 { font-size: 2.2rem; }
    .app-header { padding: 40px 0; }
    .modal-img { height: 350px; }
}
@media (max-width: 768px) {
    .app-header{padding:40px 0!important;}
    .app-header h1{font-size:24px!important;}
    .app-header p{font-size:14px!important;}
    .app-filter{display:flex!important;overflow-x:auto!important;white-space:nowrap!important;padding-bottom:10px!important;gap:8px!important;justify-content: flex-start;}
    .filter-btn{flex:0 0 auto!important;padding:10px 16px!important;font-size:14px!important;}
    .case-list { grid-template-columns: 1fr; gap:20px; }
    .modal-body { grid-template-columns: 1fr; }
    .modal-img { height: 250px; }
    .modal-scroll-body { padding:20px; }
    .close-modal {width:32px;height:32px;font-size:14px;}
}
@media (max-width: 576px) {
    .app-header h1 { font-size: 1.8rem; }
    .app-header p { font-size: 1rem; }
    .case-item-img { height: 180px; }
    .modal-img { height: 200px; }
}

.no-data{
    padding:60px 0;
    text-align:center;
    color:var(--gray);
    font-size:16px;
    grid-column:1/-1;
}