* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", sans-serif;
    scroll-behavior: smooth;
}

body {
    background: url(https://www.lt518.com/theme/plant/image/1076-1920x1080.jpg) no-repeat center fixed;
    background-size: cover;
    position: relative;
}
body::before {
    content: '';
    position: fixed;
    left:0; top:0; width:100%; height:100%;
    background: rgba(255,255,255,0.92);
    z-index: -1;
}

.right-nav {
    position: fixed;
    right: 24px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 999;
    padding: 10px 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.nav-item {
    position: relative;
    width: 36px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    cursor: pointer;
    transition: all 0.3s ease;
}
.nav-item::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #ccc;
    transition: all 0.3s;
}
.nav-item:hover::before,
.nav-item.active::before {
    background: #5c87bb;
    transform: scale(1.6);
}
.nav-item::after {
    content: attr(data-text);
    position: absolute;
    right: 18px;
    background: #5c87bb;
    color: #fff;
    font-size: 12px;
    padding: 4px 10px;
    border-radius: 4px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transform: translateX(10px);
    transition: all 0.25s ease;
}
.nav-item:hover::after {
    opacity: 1;
    transform: translateX(0);
    right: 24px;
}

.banner {
    width: 100vw;
    height: 100vh;
    background: url('https://www.lt518.com/theme/plant/image/201904040223012561.jpg') no-repeat center;
    background-size: cover;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    position: relative;
    text-align: center;
}
.banner::before {
    content: '';
    position: absolute;
    left:0; top:0;
    width:100%; height:100%;
    background: rgba(0,0,0,0.5);
}
.banner .container {
    position: relative;
    z-index: 2;
    max-width: 1200px;
    padding: 0 20px;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}
.banner h1 {
    font-size: 56px;
    margin-bottom:25px;
    line-height:1.3;
    text-align: center;
}
.banner p {
    font-size: 20px;
    max-width: 650px;
    margin:0 auto 40px;
    line-height:1.7;
    text-align: center;
}
.banner-btn {
    display: inline-block;
    padding:0 50px;
    height:56px;
    line-height:56px;
    background:#5c87bb;
    color:#fff;
    border-radius:4px;
    font-size:17px;
    text-decoration:none;
    transition:0.3s;
}
.banner-btn:hover {
    background:#4a72a3;
}

.about {
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 20px;
    display: flex;
    align-items: center;
    gap: 60px;
}
.about-img {
    flex: 0 0 500px;
}
.about-img img {
    width: 100%;
    height: 333px;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}
.about-text {
    flex: 1;
}
.about-text h2 {
    font-size: 32px;
    color: #1D2129;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 15px;
}
.about-text h2::after {
    content: '';
    width: 50px;
    height: 3px;
    background: #5c87bb;
    position: absolute;
    left: 0;
    bottom: 0;
}
.about-text p {
    font-size: 16px;
    line-height: 1.9;
    color: #4E5969;
    margin-bottom: 15px;
}

.about-area {
    font-size: 16px;
    line-height: 1.9;
    color: #4E5969;
    margin-bottom: 15px;
}

.service {
    background: #F7F8FA;
    padding: 80px 20px;
}
.service-container {
    max-width: 1200px;
    margin: 0 auto;
}
.service h2 {
    text-align: center;
    font-size: 32px;
    color: #1D2129;
    margin-bottom: 50px;
    position: relative;
    padding-bottom: 15px;
}
.service h2::after {
    content: '';
    width: 50px;
    height: 3px;
    background: #5c87bb;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: 0;
}
.service-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    list-style: none;
    margin: 0;
    padding: 0;
}
.service-item {
    width: calc(25% - 15px);
    background: #fff;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
    transition: 0.3s;
    border: 1px solid transparent;
}
.service-item:hover {
    transform: translateY(-5px);
    border-color: #5c87bb;
}
.service-item h3 {
    font-size: 19px;
    color: #1D2129;
    margin-bottom: 15px;
}
.service-item p {
    font-size: 15px;
    line-height: 1.8;
    color: #4E5969;
}

.cert {
    padding: 80px 20px;
    max-width: 1200px;
    margin: 0 auto;
}
.cert h2 {
    text-align: center;
    font-size: 32px;
    color: #1D2129;
    margin-bottom: 50px;
    position: relative;
    padding-bottom: 15px;
}
.cert h2::after {
    content: '';
    width: 50px;
    height: 3px;
    background: #5c87bb;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: 0;
}
.cert-slider {
    overflow: hidden;
    position: relative;
}
.cert-wrap {
    display: flex;
    width: max-content;
    animation: slide 25s linear infinite;
}
.cert-item {
    width: 260px;
    margin: 0 15px;
}
.cert-item img {
    width: 100%;
    height: 360px;
    object-fit: cover;
    border-radius: 6px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}
@keyframes slide {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}
.cert-slider:hover .cert-wrap {
    animation-play-state: paused;
}

.case {
    background: #F7F8FA;
    padding: 80px 20px;
}
.case-container {
    max-width: 1200px;
    margin: 0 auto;
}
.case h2 {
    text-align: center;
    font-size: 32px;
    color: #1D2129;
    margin-bottom: 50px;
    position: relative;
    padding-bottom: 15px;
}
.case h2::after {
    content: '';
    width: 50px;
    height: 3px;
    background: #5c87bb;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: 0;
}
.case-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}
.case-item {
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
    transition: 0.3s;
}
.case-item:hover {
    transform: translateY(-6px);
}
.case-img {
    width: 100%;
    height: 240px;
    object-fit: cover;
}
.case-info {
    padding: 25px;
}
.case-info h3 {
    font-size: 18px;
    color: #1D2129;
    margin-bottom: 8px;
}
.case-info p {
    font-size: 14px;
    color: #4E5969;
    line-height: 1.7;
    margin-bottom: 12px;
}
.case-tag {
    display: inline-block;
    font-size: 12px;
    color: #5c87bb;
    background: #e8eff7;
    padding: 3px 8px;
    border-radius: 4px;
    margin-right: 6px;
    margin-bottom: 6px;
}

.process {
    background: #F7F8FA;
    padding: 80px 20px;
}
.process-container {
    max-width: 1200px;
    margin: 0 auto;
}
.process h2 {
    text-align: center;
    font-size: 32px;
    color: #1D2129;
    margin-bottom: 50px;
    position: relative;
    padding-bottom: 15px;
}
.process h2::after {
    content: '';
    width: 50px;
    height: 3px;
    background: #5c87bb;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: 0;
}
.process-steps {
    display: flex;
    justify-content: space-between;
    position: relative;
}
.process-steps::before {
    content: '';
    position: absolute;
    top: 30px;
    left: 5%;
    right: 5%;
    height: 2px;
    background: #E5E6EB;
    z-index: 1;
}
.process-step {
    position: relative;
    z-index: 2;
    text-align: center;
    width: 14%;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease forwards;
}
.process-step:nth-child(1) { animation-delay: 0.1s; }
.process-step:nth-child(2) { animation-delay: 0.2s; }
.process-step:nth-child(3) { animation-delay: 0.3s; }
.process-step:nth-child(4) { animation-delay: 0.4s; }
.process-step:nth-child(5) { animation-delay: 0.5s; }
.process-step:nth-child(6) { animation-delay: 0.6s; }
.step-icon {
    width: 60px;
    height: 60px;
    line-height: 60px;
    background: #5c87bb;
    color: #fff;
    border-radius: 50%;
    font-size: 22px;
    font-weight: bold;
    margin: 0 auto 20px;
    box-shadow: 0 5px 15px rgba(92,135,187,0.15);
    position: relative;
    z-index: 2;
}
.step-icon::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 125%;
    height: 125%;
    border-radius: 50%;
    background: rgba(92, 135, 187, 0.3);
    transform: translate(-50%, -50%) scale(0.8);
    z-index: -1;
    animation: pulseRing 3s infinite ease-out;
}
.process-step h3 {
    font-size: 16px;
    color: #1D2129;
    margin-bottom: 5px;
}
.process-step p {
    font-size: 13px;
    color: #4E5969;
    line-height: 1.5;
}
.process-step:hover .step-icon {
    transform: scale(1.08);
    transition: 0.3s;
}
@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
@keyframes pulseRing {
    0% {
        transform: translate(-50%, -50%) scale(0.8);
        opacity: 0.8;
    }
    100% {
        transform: translate(-50%, -50%) scale(1.4);
        opacity: 0;
    }
}

.client {
    padding: 80px 20px;
    max-width: 1200px;
    margin: 0 auto;
}
.client h2 {
    text-align: center;
    font-size: 32px;
    color: #1D2129;
    margin-bottom: 50px;
    position: relative;
    padding-bottom: 15px;
}
.client h2::after {
    content: '';
    width: 50px;
    height: 3px;
    background: #5c87bb;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: 0;
}
.client-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
}
.client-item {
    width: 160px;
    height: 90px;
    background: #fff;
    border: 1px solid #E5E6EB;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: 0.3s;
}
.client-item img {
    max-width: 80%;
    max-height: 50px;
    opacity: 0.7;
    transition: 0.3s;
}
.client-item:hover {
    border-color: #5c87bb;
    box-shadow: 0 5px 15px rgba(92,135,187,0.1);
}
.client-item:hover img {
    opacity: 1;
    transform: scale(1.05);
}

.wiki {
    background: #F7F8FA;
    padding: 80px 20px;
}
.wiki-container {
    max-width: 1200px;
    margin: 0 auto;
}
.wiki h2 {
    text-align: center;
    font-size: 32px;
    color: #1D2129;
    margin-bottom: 50px;
    position: relative;
    padding-bottom: 15px;
}
.wiki h2::after {
    content: '';
    width: 50px;
    height: 3px;
    background: #5c87bb;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: 0;
}
.wiki-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}
.wiki-item {
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
    transition: 0.3s;
    border: 1px solid transparent;
}
.wiki-item:hover {
    transform: translateY(-5px);
    border-color: #5c87bb;
}
.wiki-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}
.wiki-info {
    padding: 25px;
}
.wiki-info h3 {
    font-size: 18px;
    color: #1D2129;
    margin-bottom: 10px;
    line-height: 1.5;
}
.wiki-info p {
    font-size: 14px;
    color: #4E5969;
    line-height: 1.7;
    margin-bottom: 15px;
}
.wiki-more {
    display: inline-block;
    color: #5c87bb;
    font-size: 14px;
    text-decoration: none;
    font-weight: 500;
}

.container {
    max-width: 1200px;
    margin: 50px auto;
    padding: 0 20px;
    display: flex;
    gap: 40px;
    align-items: flex-start;
    flex-direction: row-reverse;
}
.form-box{
    flex: 0 0 470px;
    background:#fff;
    border:1px solid #5c87bb;
    border-radius:12px;
    padding:38px;
}
.form-title{text-align:center;color:#5c87bb;margin-bottom:30px;font-size:23px}
.form-item{margin-bottom:23px}
.form-item label{color:#333;margin-bottom:7px;display:block}
.form-item input,.form-item textarea{width:100%;height:47px;border:1px solid #ddd;border-radius:8px;padding:0 15px;outline:none}
.form-item textarea{height:125px;padding:15px;resize:none}
.submit-btn{width:100%;height:50px;background:#5c87bb;color:#fff;border:none;border-radius:8px;font-size:16px;cursor:pointer}
.submit-btn:hover{background:#4a72a3}

.faq {
    flex: 1;
    padding: 0;
}
.faq h2 {
    text-align: center;
    font-size: 32px;
    color: #1D2129;
    margin-bottom: 30px;
    position: relative;
    padding-bottom: 15px;
}
.faq h2::after {
    content: '';
    width: 50px;
    height: 3px;
    background: #5c87bb;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    bottom: 0;
}
.faq-item {
    margin-bottom: 16px;
    border: 1px solid #E5E6EB;
    border-radius: 10px;
    overflow: hidden;
}
.faq-question {
    padding: 1px 20px;
    background: #FAFAFC;
    font-size: 16px;
    font-weight: 500;
    color: #1D2129;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: 0.2s;
}
.faq-question:hover {
    background: #f0f5fa;
}
.faq-question::after {
    content: '+';
    font-size: 26px;
    color: #5c87bb;
    transition: 0.3s;
}
.faq-question.active::after {
    transform: rotate(45deg);
}
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
}
.faq-answer-inner {
    padding: 0 28px 25px;
    font-size: 14px;
    color: #4E5969;
    line-height: 1.9;
}

.footer {
    background: #1D2129;
    color: #fff;
    padding: 50px 20px 30px;
}
.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 40px;
}
.footer-col {
    flex: 1;
    min-width: 250px;
}
.footer-col h3 {
    font-size: 18px;
    margin-bottom: 25px;
    position: relative;
    padding-bottom: 12px;
}
.footer-col h3::after {
    content: '';
    width: 40px;
    height: 2px;
    background: #5c87bb;
    position: absolute;
    left: 0;
    bottom: 0;
}
.footer-col p {
    font-size: 14px;
    color: #C9CDD4;
    line-height: 2;
    margin-bottom: 10px;
}
.footer-bottom {
    text-align: center;
    padding-top: 30px;
    margin-top: 40px;
    border-top: 1px solid #33363D;
    font-size: 14px;
    color: #86909C;
}
.footer a:hover { color:#C9CDD4 !important; }

@media (max-width:1200px) {
    .about {
        flex-direction: column;
        gap: 40px;
    }
    .about-img {
        flex: 0 0 auto;
        width: 100%;
    }
}
@media (max-width:992px) {
    .case-grid { grid-template-columns: repeat(2, 1fr); }
    .wiki-grid { grid-template-columns: repeat(2, 1fr); }
    .service-item { width: calc(50% - 10px); }
}
@media (max-width:900px) {
    .container { flex-direction: column; }
    .process-steps {
        flex-wrap: wrap;
        gap: 20px 0;
    }
    .process-step {
        width: 33%;
        margin-bottom: 20px;
    }
    .process-steps::before { display: none; }
}
@media (max-width:768px) {
    .right-nav {display:none;}
    .banner h1 {font-size:32px;}
    .case-grid { grid-template-columns: 1fr; }
    .wiki-grid { grid-template-columns: 1fr; }
    .service-item { width: 100%; }
    .cert-item { width: 220px; }
    .client-item { width: 140px; }
}
@media (max-width:600px) {
    .process-step { width: 50%; }
}

.inspiration-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem 1.5rem 3rem;
}

/* 头部区域 */
.inspiration {
    text-align: center;
    margin-bottom: 2rem;
}
.inspiration h2 {
    font-size: 2.2rem;
    font-weight: 700;
    color: #1D2129;
    background-clip: text;
    -webkit-background-clip: text;
    letter-spacing: -0.3px;
    margin-bottom: 0.5rem;
    font-size: 32px;
}
.inspiration p {
    color: #5e7c97;
    font-weight: 400;
    font-size: 0.95rem;
    max-width: 680px;
    margin: 0 auto;
}

/* 分类标签导航 */
.category-tabs {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.8rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid #e2edf2;
    padding-bottom: 1rem;
}
.cat-btn {
    background: white;
    border: none;
    padding: 0.6rem 1.6rem;
    font-size: 0.95rem;
    font-weight: 600;
    font-family: inherit;
    border-radius: 60px;
    cursor: pointer;
    transition: all 0.2s ease;
    color: #3c5a7d;
    box-shadow: 0 1px 2px rgba(0,0,0,0.02);
    border: 1px solid #dce5ec;
}
.cat-btn:hover {
    background-color: #eef3fa;
    border-color: #bfd1de;
    transform: translateY(-1px);
}
.cat-btn.active {
    background: #5c87bb;
    border-color: #5c87bb;
    color: white;
    box-shadow: 0 6px 14px rgba(30, 74, 59, 0.2);
}

/* 图片网格 */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.8rem;
    margin-bottom: 2rem;
}

/* 卡片样式 + 4:3 比例容器 */
.card {
    background: #ffffff;
    border-radius: 1.2rem;
    overflow: hidden;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.05);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    cursor: pointer;
}
.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 18px 30px -12px rgba(0, 0, 0, 0.12);
}
.image-wrapper {
    position: relative;
    width: 100%;
    padding-bottom: 75%; /* 4:3 */
    background-color: #eef2f5;
    overflow: hidden;
}
.image-wrapper img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.35s ease;
}
.card:hover .image-wrapper img {
    transform: scale(1.03);
}
.card-info {
    padding: 0.9rem 1rem 1.1rem;
}
.card-info h3 {
    font-size: 1rem;
    font-weight: 600;
    color: #0f2b3b;
    margin-bottom: 0.25rem;
}
.card-info p {
    font-size: 0.75rem;
    color: #6f8eaa;
    line-height: 1.4;
}

/* 展开按钮样式 */
.expand-section {
    text-align: center;
    margin-top: 0.5rem;
    margin-bottom: 0.5rem;
}
.expand-btn {
    background: white;
    border: 1px solid #cbdde9;
    padding: 0.75rem 2rem;
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: 40px;
    font-family: inherit;
    color: #1e4a3b;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    background-color: #fefefe;
    box-shadow: 0 2px 6px rgba(0,0,0,0.03);
}
.expand-btn:hover {
    background-color: #eaf4ed;
    border-color: #9bc0ae;
    transform: translateY(-2px);
    box-shadow: 0 8px 18px rgba(0,0,0,0.05);
}
.expand-btn:active {
    transform: translateY(1px);
}
.expand-icon {
    font-size: 1.1rem;
    transition: transform 0.2s;
}
.expand-btn.expanded .expand-icon {
    transform: rotate(180deg);
}

.expand-btn.hidden-btn {
    display: none;
}

/* 空状态提示 */
.empty-message {
    text-align: center;
    padding: 2.5rem;
    background: #fafdff;
    border-radius: 1.8rem;
    color: #7c97af;
    font-weight: 500;
    grid-column: 1 / -1;
}

.footer-note {
    text-align: center;
    margin-top: 2.5rem;
    font-size: 0.75rem;
    color: #8ca3bc;
    border-top: 1px solid #e2edf2;
    padding-top: 1.8rem;
}

/* ========== 灯箱/图片预览模态框样式 ========== */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.92);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    visibility: hidden;
    opacity: 0;
    transition: visibility 0.2s, opacity 0.25s ease;
    cursor: pointer; /* 点击任意空白关闭 */
}
.lightbox.active {
    visibility: visible;
    opacity: 1;
}
.lightbox-container {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: default;
    animation: fadeScale 0.25s ease-out;
}
@keyframes fadeScale {
    from {
        opacity: 0;
        transform: scale(0.96);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}
.lightbox-img {
    max-width: 90vw;
    max-height: 80vh;
    object-fit: contain;
    border-radius: 1rem;
    box-shadow: 0 25px 45px rgba(0,0,0,0.4);
    background: #111;
    border: 2px solid rgba(255,255,255,0.15);
}
.lightbox-caption {
    margin-top: 1.2rem;
    background: rgba(20, 20, 30, 0.75);
    backdrop-filter: blur(12px);
    border-radius: 60px;
    padding: 0.6rem 1.5rem;
    color: #f0f3f8;
    font-size: 0.9rem;
    font-weight: 500;
    text-align: center;
    max-width: 80%;
    letter-spacing: 0.3px;
    border: 1px solid rgba(255,255,255,0.2);
}
.lightbox-caption h4 {
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 0.2rem;
}
.lightbox-caption p {
    font-size: 0.8rem;
    opacity: 0.85;
}
/* 关闭小提示 (优雅) */
.close-hint {
    position: absolute;
    bottom: 1rem;
    left: 0;
    right: 0;
    text-align: center;
    font-size: 0.7rem;
    color: rgba(255,255,255,0.5);
    pointer-events: none;
    margin-top: 1rem;
    top: -40px;
}
@media (max-width: 640px) {
    .lightbox-caption {
        padding: 0.4rem 1rem;
        font-size: 0.75rem;
        max-width: 90%;
    }
    .close-hint {
        font-size: 0.6rem;
    }
}