/* ============================
   全局变量 & 重置
   ============================ */
:root {
    --primary: #0066FF;
    --primary-light: #00D4FF;
    --primary-dark: #0044CC;
    --dark: #0A1628;
    --dark-2: #111F38;
    --dark-3: #1A2B48;
    --gray-50: #F8FAFC;
    --gray-100: #F1F5F9;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-400: #94A3B8;
    --gray-500: #64748B;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1E293B;
    --gray-900: #0F172A;
    --white: #FFFFFF;
    --gradient-primary: linear-gradient(135deg, #0066FF 0%, #00D4FF 100%);
    --gradient-dark: linear-gradient(180deg, #0A1628 0%, #0F1F38 100%);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 40px rgba(0, 102, 255, 0.15);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 70px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    color: var(--gray-800);
    background: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================
   通用组件
   ============================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 32px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: 0 4px 20px rgba(0, 102, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 102, 255, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 1.5px solid rgba(255, 255, 255, 0.4);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--white);
}

.btn-block {
    width: 100%;
    padding: 14px;
    font-size: 16px;
}

.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--primary);
    margin-bottom: 12px;
}

.section-title {
    font-size: 36px;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.section-subtitle {
    font-size: 16px;
    color: var(--gray-500);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================
   导航栏
   ============================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.logo-text {
    font-size: 18px;
    font-weight: 700;
    color: var(--gray-900);
    letter-spacing: -0.3px;
}

.nav-menu {
    display: flex;
    gap: 4px;
    margin-left: auto;
}

.nav-link {
    display: block;
    padding: 8px 20px;
    font-size: 15px;
    font-weight: 500;
    color: var(--gray-600);
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--primary);
    background: rgba(0, 102, 255, 0.06);
}

.nav-link.active {
    color: var(--primary);
    font-weight: 600;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.nav-phone {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 15px;
    font-weight: 600;
    color: var(--primary);
    padding: 8px 16px;
    background: rgba(0, 102, 255, 0.06);
    border-radius: 8px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    width: 24px;
    height: 2.5px;
    background: var(--gray-700);
    border-radius: 2px;
    transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================
   轮播图 Hero
   ============================ */
.hero {
    position: relative;
    height: 80vh;
    min-height: 540px;
    overflow: hidden;
    margin-top: 70px;
}

.carousel {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

/* 横向滑动轨道 */
.carousel-track {
    display: flex;
    width: 100%;
    height: 100%;
    transition: transform 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
    will-change: transform;
}

/* 拖动时关闭过渡，做到跟手 */
.carousel-track.dragging {
    transition: none;
}

.carousel-slide {
    position: relative;
    flex: 0 0 100%;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.carousel-slide::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 20% 30%, rgba(0, 102, 255, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(0, 212, 255, 0.1) 0%, transparent 50%);
}

.carousel-content {
    position: relative;
    z-index: 2;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    width: 70%;
}

.carousel-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(0, 212, 255, 0.15);
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary-light);
    margin-bottom: 24px;
    animation: fadeInUp 0.8s ease;
}

.carousel-title {
    font-size: 52px;
    font-weight: 800;
    color: var(--white);
    line-height: 1.2;
    margin-bottom: 20px;
    letter-spacing: -1px;
    animation: fadeInUp 0.8s ease 0.1s both;
}

.carousel-desc {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin-bottom: 32px;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.carousel-btns {
    display: flex;
    gap: 16px;
    animation: fadeInUp 0.8s ease 0.3s both;
}

/* 轮播图视觉效果 */
.carousel-visual {
    position: absolute;
    right: 15%;
    top: 50%;
    transform: translateY(-50%);
    width: 420px;
    height: 420px;
    z-index: 1;
}

.core-sphere {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100px;
    height: 100px;
    background: var(--gradient-primary);
    border-radius: 50%;
    box-shadow: 0 0 60px rgba(0, 102, 255, 0.5);
    animation: pulse 3s ease-in-out infinite;
}

.orbit-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: 50%;
    animation: rotate 20s linear infinite;
}

.ring-1 {
    width: 240px;
    height: 240px;
}

.ring-2 {
    width: 380px;
    height: 380px;
    animation-duration: 30s;
    animation-direction: reverse;
}

.floating-card {
    position: absolute;
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 14px;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--white);
    font-size: 14px;
    font-weight: 600;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    animation: floatCard 4s ease-in-out infinite;
}

.floating-card .fc-icon {
    font-size: 24px;
}

.card-1 { top: 10%; left: 5%; animation-delay: 0s; }
.card-2 { top: 15%; right: 0%; animation-delay: 1s; }
.card-3 { bottom: 15%; left: 0%; animation-delay: 2s; }
.card-4 { bottom: 10%; right: 5%; animation-delay: 0.5s; }

/* 统计浮动 */
.stats-floating {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    width: 100%;
}

.stats-floating .stat-item {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 16px;
    padding: 28px 24px;
    text-align: center;
    animation: floatCard 4s ease-in-out infinite;
}

.stats-floating .stat-item:nth-child(2) { animation-delay: 0.5s; }
.stats-floating .stat-item:nth-child(3) { animation-delay: 1s; }
.stats-floating .stat-item:nth-child(4) { animation-delay: 1.5s; }

.stats-floating .stat-num {
    font-size: 36px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
}

.stats-floating .stat-label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    margin-top: 4px;
    display: block;
}

/* 技术栈浮动 */
.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    align-items: center;
    height: 100%;
}

.tech-item {
    padding: 14px 24px;
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 12px;
    color: var(--white);
    font-size: 16px;
    font-weight: 600;
    animation: floatCard 3s ease-in-out infinite;
}

.tech-item:nth-child(1) { animation-delay: 0s; }
.tech-item:nth-child(2) { animation-delay: 0.2s; }
.tech-item:nth-child(3) { animation-delay: 0.4s; }
.tech-item:nth-child(4) { animation-delay: 0.6s; }
.tech-item:nth-child(5) { animation-delay: 0.8s; }
.tech-item:nth-child(6) { animation-delay: 1s; }
.tech-item:nth-child(7) { animation-delay: 1.2s; }
.tech-item:nth-child(8) { animation-delay: 1.4s; }

/* 轮播图控制 */
.carousel-dots {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 10;
}

.dot {
    width: 32px;
    height: 4px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 2px;
    cursor: pointer;
    transition: var(--transition);
}

.dot.active {
    background: var(--primary-light);
    width: 48px;
}

.carousel-arrows {
    position: absolute;
    top: 50%;
    width: 100%;
    display: flex;
    justify-content: space-between;
    padding: 0 24px;
    transform: translateY(-50%);
    z-index: 10;
    pointer-events: none;
}

.arrow {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--white);
    font-size: 18px;
    cursor: pointer;
    transition: var(--transition);
    pointer-events: auto;
    display: flex;
    align-items: center;
    justify-content: center;
}

.arrow:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

/* ============================
   我们能做什么
   ============================ */
.services {
    padding: 100px 0;
    background: var(--gray-50);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    transition: var(--transition);
    border: 1px solid var(--gray-100);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: var(--transition);
    transform-origin: left;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 102, 255, 0.06);
    border-radius: 16px;
    margin-bottom: 24px;
    transition: var(--transition);
}

.service-card:hover .service-icon {
    background: rgba(0, 102, 255, 0.12);
    transform: scale(1.05);
}

.service-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.service-desc {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.7;
    margin-bottom: 20px;
}

.service-features {
    margin-bottom: 20px;
}

.service-features li {
    font-size: 13px;
    color: var(--gray-600);
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
}

.service-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 700;
}

.service-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    transition: var(--transition);
}

.service-link:hover {
    gap: 4px;
    letter-spacing: 0.5px;
}

/* ============================
   我们的优势
   ============================ */
.advantages {
    padding: 100px 0;
    background: var(--white);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.adv-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 32px;
    display: flex;
    align-items: flex-start;
    gap: 20px;
    transition: var(--transition);
    position: relative;
}

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

.adv-num {
    font-size: 36px;
    font-weight: 800;
    color: var(--gray-100);
    line-height: 1;
    flex-shrink: 0;
    transition: var(--transition);
}

.adv-card:hover .adv-num {
    color: rgba(0, 102, 255, 0.15);
}

.adv-body {
    flex: 1;
}

.adv-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.adv-desc {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.7;
}

.adv-icon {
    position: absolute;
    top: 28px;
    right: 28px;
    font-size: 28px;
    opacity: 0.5;
    transition: var(--transition);
}

.adv-card:hover .adv-icon {
    opacity: 1;
    transform: scale(1.1);
}

/* ============================
   解决方案
   ============================ */
.solutions {
    padding: 100px 0;
    background: var(--gray-50);
}

.solutions-tabs {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.tab-list {
    display: flex;
    border-bottom: 1px solid var(--gray-200);
    background: var(--gray-50);
}

.tab-btn {
    flex: 1;
    padding: 18px 24px;
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-500);
    background: none;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.tab-btn:hover {
    color: var(--primary);
}

.tab-btn.active {
    color: var(--primary);
    background: var(--white);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 20%;
    right: 20%;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.tab-content {
    padding: 48px;
}

.tab-panel {
    display: none;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.tab-panel.active {
    display: grid;
    animation: fadeInUp 0.5s ease;
}

.panel-left h3 {
    font-size: 28px;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 16px;
}

.panel-left p {
    font-size: 15px;
    color: var(--gray-500);
    line-height: 1.8;
    margin-bottom: 24px;
}

.panel-list {
    margin-bottom: 32px;
}

.panel-list li {
    padding: 10px 0;
    font-size: 15px;
    color: var(--gray-700);
    display: flex;
    align-items: center;
    gap: 10px;
}

.panel-list .check {
    width: 22px;
    height: 22px;
    background: rgba(0, 102, 255, 0.1);
    color: var(--primary);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
    flex-shrink: 0;
}

.panel-right {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.panel-card {
    background: var(--gray-50);
    border-radius: var(--radius);
    padding: 28px 20px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid transparent;
}

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

.pc-icon {
    font-size: 36px;
    margin-bottom: 12px;
}

.panel-card h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 6px;
}

.panel-card p {
    font-size: 13px;
    color: var(--gray-400);
}

/* ============================
   案例列表
   ============================ */
.cases {
    padding: 100px 0;
    background: var(--white);
}

    .cases-filter {
        display: flex;
        justify-content: center;
        gap: 8px;
        margin-bottom: 15px;
        flex-wrap: wrap;
    }

.filter-btn {
    padding: 10px 24px;
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-500);
    background: var(--gray-100);
    border: none;
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover {
    color: var(--primary);
    background: rgba(0, 102, 255, 0.08);
}

.filter-btn.active {
    color: var(--white);
    background: var(--gradient-primary);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.case-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--gray-100);
}

.case-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.case-card.hidden {
    display: none;
}

.case-image {
    height: 220px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
   
}
.photo_nav{
 padding: 30px;
 /* height: 550px; */
 border-radius: var(--radius);
 background-color: var(--white);
}
.photo{
     background-position: center;
    background-size: 100% 100%;
    background-repeat: no-repeat;
    border-radius: var(--radius);
    height: 100%;
}

/* 用伪元素承载背景图，便于悬浮放大且被容器裁切 */
.case-image::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: var(--bg);
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
    transition: transform 0.5s ease;
    z-index: 0;
}

.case-image:hover::before {
    transform: scale(1.1);
}

.case-mockup {
    transform: perspective(600px) rotateY(-5deg) rotateX(5deg);
    transition: var(--transition);
}

.case-card:hover .case-mockup {
    transform: perspective(600px) rotateY(0deg) rotateX(0deg);
}

.mockup-screen {
    width: 130px;
    height: 220px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 16px;
    padding: 10px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.mockup-web {
    width: 260px;
    height: 170px;
    border-radius: 10px;
}

.ms-header {
    display: flex;
    gap: 4px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--gray-100);
    margin-bottom: 8px;
}

.ms-header span {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--gray-300);
}

.ms-header span:nth-child(1) { background: #FF5F57; }
.ms-header span:nth-child(2) { background: #FEBC2E; }
.ms-header span:nth-child(3) { background: #28C840; }

.ms-banner {
    height: 50px;
    background: var(--gray-100);
    border-radius: 8px;
    margin-bottom: 8px;
}

.ms-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
    margin-bottom: 8px;
}

.ms-grid div {
    height: 30px;
    background: var(--gray-100);
    border-radius: 6px;
}

.ms-list div {
    height: 20px;
    background: var(--gray-100);
    border-radius: 6px;
    margin-bottom: 6px;
}

.ms-circle {
    width: 50px;
    height: 50px;
    background: var(--gray-100);
    border-radius: 50%;
    margin: 10px auto;
}

.ms-web-hero {
    height: 40px;
    background: rgba(255, 255, 255, 0.4);
    border-radius: 6px;
    margin-bottom: 8px;
}

.ms-web-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
}

.ms-web-row div {
    height: 30px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 4px;
}

.ms-web-chart {
    display: flex;
    align-items: flex-end;
    gap: 6px;
    height: 60px;
    margin-bottom: 8px;
}

.ms-web-chart .bar {
    flex: 1;
    background: rgba(255, 255, 255, 0.4);
    border-radius: 4px 4px 0 0;
    min-height: 10px;
}

.case-tag {
    position: absolute;
    z-index: 1;
    top: 16px;
    right: 16px;
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 12px;
    font-size: 12px;
    font-weight: 700;
    color: var(--gray-700);
    backdrop-filter: blur(10px);
}

.case-info {
    padding: 24px;
}

.case-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 10px;
}

.case-desc {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.7;
    margin-bottom: 16px;
    /* 固定两行高度并隐藏溢出 */
    height: 47.6px;
    overflow: hidden;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
}

.case-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.case-tags span {
    padding: 4px 10px;
    background: var(--gray-100);
    border-radius: 4px;
    font-size: 12px;
    color: var(--gray-600);
    font-weight: 500;
}

.cases-more {
    text-align: center;
    margin-top: 48px;
}

.cases-more .btn-outline {
    color: var(--primary);
    border-color: var(--primary);
}

.cases-more .btn-outline:hover {
    background: var(--primary);
    color: var(--white);
}

/* ============================
   数据统计
   ============================ */
.stats-section {
    padding: 80px 0;
    background: var(--gradient-dark);
    position: relative;
    overflow: hidden;
}

.stats-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(0, 102, 255, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(0, 212, 255, 0.1) 0%, transparent 50%);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    position: relative;
}

.stat-block {
    text-align: center;
}

.stat-block .stat-num {
    font-size: 56px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.stat-block .stat-label {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.6);
    margin-top: 8px;
}

/* ============================
   联系我们
   ============================ */
.contact {
    padding: 100px 0;
    background: var(--gray-50);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.3fr;
    gap: 48px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 20px;
    background: var(--white);
    border-radius: var(--radius);
    transition: var(--transition);
    border: 1px solid var(--gray-100);
}

.contact-item:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.ci-icon {
    width: 44px;
    height: 44px;
    background: rgba(0, 102, 255, 0.08);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.ci-body h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-400);
    margin-bottom: 4px;
}

.ci-body p {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-800);
}

.contact-qr {
    margin-top: 8px;
    text-align: center;
    padding: 24px;
    background: var(--white);
    border-radius: var(--radius);
    border: 1px solid var(--gray-100);
}

.qr-placeholder {
    width: 120px;
    height: 120px;
    margin: 0 auto 12px;
    background: var(--gray-50);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.qr-placeholder img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
}

.qr-pattern {
    width: 100px;
    height: 100px;
    position: relative;
    background: var(--white);
    border-radius: 8px;
}

.qr-corner {
    position: absolute;
    width: 24px;
    height: 24px;
    border: 4px solid var(--gray-900);
    border-radius: 4px;
}

.qr-tl { top: 4px; left: 4px; }
.qr-tr { top: 4px; right: 4px; }
.qr-bl { bottom: 4px; left: 4px; }

.qr-dots {
    position: absolute;
    top: 32px;
    left: 32px;
    right: 32px;
    bottom: 32px;
    background-image: 
        repeating-linear-gradient(0deg, var(--gray-900) 0, var(--gray-900) 3px, transparent 3px, transparent 6px),
        repeating-linear-gradient(90deg, var(--gray-900) 0, var(--gray-900) 3px, transparent 3px, transparent 6px);
    opacity: 0.7;
}

.contact-qr p {
    font-size: 13px;
    color: var(--gray-500);
}

.contact-form-wrap {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-md);
    position: relative;
}

.form-title {
    font-size: 24px;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.form-subtitle {
    font-size: 14px;
    color: var(--gray-500);
    margin-bottom: 28px;
}

.contact-form .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 8px;
}

.required {
    color: #EF4444;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 14px;
    color: var(--gray-800);
    background: var(--gray-50);
    border: 1.5px solid var(--gray-200);
    border-radius: 8px;
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--white);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-tip {
    font-size: 13px;
    color: var(--gray-400);
    text-align: center;
    margin-top: 16px;
}

.form-success {
    display: none;
    text-align: center;
    padding: 40px 20px;
}

.form-success.show {
    display: block;
    animation: fadeInUp 0.5s ease;
}

.success-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    background: rgba(34, 197, 94, 0.1);
    color: #22C55E;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    font-weight: 700;
}

.form-success h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.form-success p {
    font-size: 15px;
    color: var(--gray-500);
}

/* ============================
   页脚
   ============================ */
.footer {
    background: var(--dark);
    color: rgba(255, 255, 255, 0.6);
    padding: 64px 0 0;
}

.footer-top {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 64px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.footer-logo span {
    font-size: 18px;
    font-weight: 700;
    color: var(--white);
}

.footer-desc {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer-cert {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.cert-badge {
    padding: 6px 14px;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: 6px;
    font-size: 12px;
    color: var(--primary-light);
    font-weight: 500;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.footer-col h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 16px;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.5);
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: var(--primary-light);
}

.footer-bottom {
    padding: 24px 0;
    text-align: center;
    font-size: 13px;
}

.footer-addr {
    margin-top: 4px;
    font-size: 12px;
    opacity: 0.5;
}

/* ============================
   返回顶部
   ============================ */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: var(--white);
    border-radius: 50%;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--primary);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-4px);
}

/* ============================
   动画
   ============================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 60px rgba(0, 102, 255, 0.5);
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        box-shadow: 0 0 80px rgba(0, 102, 255, 0.7);
        transform: translate(-50%, -50%) scale(1.05);
    }
}

@keyframes rotate {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes floatCard {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

/* 滚动渐入 */
.fade-in {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================
   响应式
   ============================ */
@media (max-width: 1024px) {
    .carousel-content { width: 60%; }
    .carousel-title { font-size: 42px; }
    .carousel-visual { width: 320px; height: 320px; right: 3%; }
    .ring-1 { width: 180px; height: 180px; }
    .ring-2 { width: 300px; height: 300px; }
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .advantages-grid { grid-template-columns: repeat(2, 1fr); }
    .cases-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    /* 移动端容器间距收窄 */
    .container { padding: 0 15px; }
    .nav-container { padding: 0 15px; }
    /* 板块间间距缩小为当前一半（100px -> 50px） */
    .services,
    .advantages,
    .solutions,
    .cases,
    .contact,
    .section-block {
        padding: 15px 0;
    }
    /* 板块标题与内容间距也收窄，统一移动端间距 */
    .section-header {
        margin-bottom: 15px;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 10px;
        gap: 0;
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-link {
        display: inline-block;
        width: auto;
        align-self: flex-start;
        padding: 10px 15px;
        border-radius: 8px;
    }

    .nav-phone { display: none; }
    .nav-toggle { display: flex; }

    .hero {
        min-height: 0;
        height: 78vh;
        margin-top: 60px;
        padding: 0;
    }
    /* 移动端 slide 仍作为 track 的一项并排排列 */
    .carousel-slide {
        padding: 0;
    }
    .carousel-content {
        width: 100%;
        padding: 0 24px;
        text-align: center;
    }
    .carousel-title { font-size: 30px; }
    .carousel-desc { font-size: 15px; margin-bottom: 24px; }
    .carousel-btns { justify-content: center; flex-wrap: wrap; }
    .carousel-visual { display: none; }
    /* 移动端隐藏左右箭头，改用触摸滑动 */
    .carousel-arrows { display: none; }
    .carousel-dots { bottom: 20px; }

    .section-title { font-size: 28px; }
    .section-subtitle { font-size: 14px; }

    .services-grid { grid-template-columns: 1fr; gap: 15px; }
    .service-card { padding: 24px 20px; }
    .advantages-grid { grid-template-columns: 1fr; gap: 15px; }
    .adv-card { padding: 24px 20px; }
    .cases-grid { grid-template-columns: 1fr; gap: 15px; }
    .cases-more { margin-top: 15px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 15px; }
    .stat-block .stat-num { font-size: 40px; }

    .tab-list { flex-direction: column; }
    .tab-content { padding: 24px; }
    .tab-panel { grid-template-columns: 1fr; gap: 15px; }
    .panel-right { grid-template-columns: 1fr 1fr; gap: 12px; }
    .panel-card { padding: 20px 16px; }

    .contact-grid { grid-template-columns: 1fr; gap: 15px; }
    .contact-info { gap: 12px; }
    .contact-item { padding: 16px; }
    .form-row { grid-template-columns: 1fr !important; }
    .contact-form-wrap { padding: 20px; }

    .footer-top { grid-template-columns: 1fr; gap: 24px; padding-bottom: 15px;}
    .footer-links { grid-template-columns: 1fr 1fr; gap: 15px; }

    .contact-form-wrap { padding: 24px; }
    .photo_nav{padding: 15px;}
    .photo{
        width: 100%;
        height: calc((100vw - 30px) / 624px * 600px);
    }
}