/* ============================
   基础样式重置
   ============================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #1a56db;
    --primary-dark: #1242b0;
    --primary-light: #e8f0fe;
    --secondary: #0f172a;
    --text: #334155;
    --text-light: #64748b;
    --border: #e8ecf1;
    --bg-light: #f7f9fc;
    --white: #ffffff;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 12px 40px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    color: var(--text);
    line-height: 1.7;
    background: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* ============================
   按钮样式
   ============================ */
.btn {
    display: inline-block;
    padding: 12px 32px;
    font-size: 15px;
    font-weight: 500;
    border-radius: 8px;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
    text-align: center;
    letter-spacing: 0.3px;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26, 86, 219, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: rgba(255, 255, 255, 0.6);
}

.btn-outline:hover {
    background: var(--white);
    color: var(--primary);
    border-color: var(--white);
    transform: translateY(-2px);
}

.btn-block {
    display: block;
    width: 100%;
}

/* ============================
   头部导航
   ============================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 76px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    transition: opacity 0.25s ease;
}

.logo:hover {
    opacity: 0.85;
}

.logo-img {
    height: 58px;
    width: auto;
}

.logo-text-img {
    height: 38px;
    width: auto;
}

.logo-slogan {
    font-size: 13px;
    color: var(--text-light);
    font-weight: 500;
    letter-spacing: 1px;
    margin-left: 4px;
    white-space: nowrap;
}

.nav {
    display: flex;
    align-items: center;
    gap: 2px;
}

.nav-link {
    font-size: 14.5px;
    font-weight: 500;
    color: #475569;
    position: relative;
    padding: 8px 18px;
    border-radius: 8px;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    letter-spacing: 0.2px;
}

.nav-link::after {
    display: none;
}

.nav-link:hover {
    color: var(--primary);
    background: rgba(26, 86, 219, 0.05);
}

.nav-link.active {
    color: var(--primary);
    font-weight: 600;
    background: rgba(26, 86, 219, 0.07);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    border-radius: 8px;
    transition: background 0.2s ease;
}

.nav-toggle:hover {
    background: rgba(0, 0, 0, 0.04);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--secondary);
    transition: var(--transition);
}

/* ============================
   主视觉区域
   ============================ */
.hero {
    position: relative;
    min-height: 500px;
    display: flex;
    align-items: center;
    padding-top: 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('../img/hero-bg.jpg') center center / cover no-repeat;
    z-index: 0;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(8, 16, 30, 0.88) 0%, rgba(14, 30, 58, 0.82) 40%, rgba(20, 60, 140, 0.75) 100%);
}

.hero-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(96, 165, 250, 0.015) 2px,
        rgba(96, 165, 250, 0.015) 4px
    );
    pointer-events: none;
}

.hero-decoration {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
    pointer-events: none;
}

.hero-circle {
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(96, 165, 250, 0.08);
}

.hero-circle-1 {
    width: 400px;
    height: 400px;
    top: -120px;
    right: -100px;
}

.hero-circle-2 {
    width: 250px;
    height: 250px;
    bottom: -80px;
    left: -60px;
    border-color: rgba(96, 165, 250, 0.06);
}

.hero-content {
    text-align: center;
    color: var(--white);
    padding: 40px 0;
    position: relative;
    z-index: 1;
}

.hero-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 3px;
    color: #93c5fd;
    margin-bottom: 18px;
    padding: 5px 20px;
    border: 1px solid rgba(96, 165, 250, 0.3);
    border-radius: 20px;
    background: rgba(96, 165, 250, 0.06);
    text-shadow: 0 0 12px rgba(96, 165, 250, 0.3);
}

.hero-title {
    font-size: 40px;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: 1px;
    line-height: 1.3;
    text-shadow: 0 0 40px rgba(96, 165, 250, 0.15), 0 2px 10px rgba(0, 0, 0, 0.3);
}

.hero-title-accent {
    background: linear-gradient(90deg, #3b82f6, #60a5fa, #93c5fd, #60a5fa);
    background-size: 200% 100%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: accentFlow 3s ease-in-out infinite;
    filter: drop-shadow(0 0 8px rgba(96, 165, 250, 0.4));
}

@keyframes accentFlow {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero-subtitle {
    font-size: 16px;
    opacity: 0.9;
    margin-bottom: 30px;
    line-height: 1.8;
    text-shadow: 0 1px 8px rgba(0, 0, 0, 0.4);
    letter-spacing: 0.5px;
}

.hero-btns {
    display: flex;
    gap: 14px;
    justify-content: center;
    margin-bottom: 36px;
}

.hero-divider {
    width: 48px;
    height: 2px;
    background: rgba(96, 165, 250, 0.4);
    margin: 0 auto 28px;
    border-radius: 1px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0;
}

.stat-item {
    text-align: center;
    padding: 0 32px;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255, 255, 255, 0.12);
}

.stat-number {
    font-size: 32px;
    font-weight: 700;
    display: block;
    color: var(--white);
    text-shadow: 0 0 20px rgba(96, 165, 250, 0.2);
}

.stat-unit {
    font-size: 15px;
    font-weight: 500;
    opacity: 0.8;
}

.stat-label {
    display: block;
    font-size: 13px;
    opacity: 0.6;
    margin-top: 4px;
}

/* ============================
   通用区块样式
   ============================ */
.section {
    padding: 90px 0;
}

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

.section-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 14px;
    letter-spacing: -0.3px;
}

.section-title::after {
    content: '';
    display: block;
    width: 40px;
    height: 3px;
    background: var(--primary);
    margin: 14px auto 0;
    border-radius: 2px;
    opacity: 0.7;
}

.section-desc {
    font-size: 15px;
    color: var(--text-light);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ============================
   关于我们
   ============================ */
.about {
    background: var(--bg-light);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: start;
}

.about-text {
    padding-top: 8px;
}

.about-lead {
    font-size: 17px;
    color: var(--secondary);
    font-weight: 600;
    margin-bottom: 14px;
    line-height: 1.6;
}

.about-text p {
    margin-bottom: 14px;
    color: var(--text);
    font-size: 14.5px;
    line-height: 1.8;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-top: 28px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--secondary);
    font-weight: 500;
}

.feature-item i {
    color: var(--primary);
    font-size: 14px;
    flex-shrink: 0;
}

.about-image {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.about-card {
    background: var(--white);
    padding: 28px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.about-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(26, 86, 219, 0.15);
}

.card-icon {
    width: 56px;
    height: 56px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
}

.card-icon img {
    width: 38px;
    height: 38px;
    object-fit: contain;
}

.about-card h3 {
    font-size: 17px;
    color: var(--secondary);
    margin-bottom: 8px;
    font-weight: 600;
}

.about-card p {
    font-size: 13.5px;
    color: var(--text-light);
    line-height: 1.6;
}

/* ============================
   核心业务
   ============================ */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--white);
    padding: 36px 28px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.service-card:hover {
    border-color: rgba(26, 86, 219, 0.2);
    box-shadow: var(--shadow-lg);
    transform: translateY(-3px);
}

.service-icon {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
}

.service-icon img {
    width: 44px;
    height: 44px;
    object-fit: contain;
}

.service-card h3 {
    font-size: 19px;
    color: var(--secondary);
    margin-bottom: 10px;
    font-weight: 600;
}

.service-card p {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 18px;
    line-height: 1.7;
}

.service-list {
    border-top: 1px solid var(--border);
    padding-top: 14px;
}

.service-list li {
    font-size: 13.5px;
    color: var(--text);
    padding: 5px 0;
    padding-left: 16px;
    position: relative;
}

.service-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 5px;
    height: 5px;
    background: var(--primary);
    border-radius: 50%;
}

/* ============================
   解决方案
   ============================ */
.solutions {
    background: var(--bg-light);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

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

.solution-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(26, 86, 219, 0.15);
}

.solution-img {
    aspect-ratio: 1 / 1;
    background: linear-gradient(135deg, var(--primary-light), #dbeafe);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.solution-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.solution-content {
    padding: 18px;
}

.solution-content h3 {
    font-size: 16px;
    color: var(--secondary);
    margin-bottom: 6px;
    font-weight: 600;
}

.solution-content p {
    font-size: 13px;
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 10px;
}

.solution-tag {
    display: inline-block;
    font-size: 12px;
    color: var(--primary);
    background: var(--primary-light);
    padding: 3px 10px;
    border-radius: 20px;
    font-weight: 500;
}

/* ============================
   技术优势
   ============================ */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.advantage-item {
    text-align: center;
    padding: 28px 16px;
}

.advantage-icon {
    width: 64px;
    height: 64px;
    background: var(--primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 18px;
    transition: var(--transition);
}

.advantage-item:hover .advantage-icon {
    background: var(--primary);
    box-shadow: 0 6px 20px rgba(26, 86, 219, 0.25);
}

.advantage-icon i {
    font-size: 26px;
    color: var(--primary);
    transition: var(--transition);
}

.advantage-item:hover .advantage-icon i {
    color: var(--white);
}

.advantage-item h3 {
    font-size: 17px;
    color: var(--secondary);
    margin-bottom: 8px;
    font-weight: 600;
}

.advantage-item p {
    font-size: 13.5px;
    color: var(--text-light);
    line-height: 1.6;
}

/* ============================
   AI能力
   ============================ */
.ai-section {
    background: linear-gradient(135deg, #0c1525 0%, #162d50 50%, #1a3a6a 100%);
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.ai-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(ellipse at 30% 50%, rgba(96, 165, 250, 0.06) 0%, transparent 50%);
    pointer-events: none;
}

.ai-header {
    text-align: center;
    margin-bottom: 46px;
    position: relative;
    z-index: 1;
}

.ai-badge {
    display: inline-block;
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: #60a5fa;
    margin-bottom: 14px;
    padding: 5px 18px;
    border: 1px solid rgba(96, 165, 250, 0.25);
    border-radius: 30px;
    background: rgba(96, 165, 250, 0.06);
}

.ai-header h2 {
    font-size: 30px;
    margin-bottom: 14px;
    font-weight: 700;
    letter-spacing: -0.3px;
}

.ai-lead {
    font-size: 15px;
    opacity: 0.8;
    margin-bottom: 0;
}

.ai-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    position: relative;
    z-index: 1;
}

.ai-card {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 14px;
    padding: 32px 24px;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.ai-card:hover {
    background: rgba(255, 255, 255, 0.07);
    border-color: rgba(96, 165, 250, 0.25);
    transform: translateY(-3px);
}

.ai-card-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(96, 165, 250, 0.1);
    border-radius: 14px;
}

.ai-card-icon i {
    font-size: 22px;
    color: #60a5fa;
}

.ai-card h4 {
    font-size: 17px;
    margin-bottom: 10px;
    font-weight: 600;
}

.ai-card p {
    font-size: 13.5px;
    opacity: 0.75;
    line-height: 1.6;
    margin-bottom: 0;
}

.ai-card-line {
    width: 36px;
    height: 2px;
    background: #60a5fa;
    margin: 18px auto 0;
    border-radius: 1px;
    opacity: 0.5;
}

/* ============================
   联系我们
   ============================ */
.contact {
    background: var(--bg-light);
    position: relative;
    overflow: hidden;
}

.contact::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -30%;
    width: 60%;
    height: 200%;
    background: radial-gradient(ellipse at center, rgba(26, 86, 219, 0.04) 0%, transparent 60%);
    pointer-events: none;
}

.contact-header {
    text-align: center;
    margin-bottom: 46px;
    position: relative;
    z-index: 1;
}

.contact-badge {
    display: inline-block;
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--primary);
    margin-bottom: 14px;
    padding: 5px 18px;
    border: 1px solid rgba(26, 86, 219, 0.15);
    border-radius: 30px;
    background: rgba(26, 86, 219, 0.04);
}

.contact-title {
    font-size: 30px;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 12px;
    letter-spacing: -0.3px;
}

.contact-desc {
    font-size: 15px;
    color: var(--text-light);
    margin-bottom: 0;
}

.contact-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    position: relative;
    z-index: 1;
}

.contact-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 28px 20px;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.contact-card:hover {
    border-color: rgba(26, 86, 219, 0.2);
    box-shadow: 0 6px 24px rgba(26, 86, 219, 0.08);
    transform: translateY(-3px);
}

.contact-card-icon {
    width: 52px;
    height: 52px;
    margin: 0 auto 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-light);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.contact-card:hover .contact-card-icon {
    background: var(--primary);
}

.contact-card-icon i {
    font-size: 20px;
    color: var(--primary);
    transition: all 0.3s ease;
}

.contact-card:hover .contact-card-icon i {
    color: var(--white);
}

.contact-card h4 {
    font-size: 13px;
    color: var(--text-light);
    font-weight: 500;
    margin-bottom: 6px;
}

.contact-card p {
    font-size: 14.5px;
    color: var(--secondary);
    font-weight: 600;
    margin-bottom: 0;
    word-break: break-all;
}

/* ============================
   底部
   ============================ */
.footer {
    background: var(--secondary);
    color: rgba(255, 255, 255, 0.75);
    padding: 32px 0 0;
}

.footer-qr-wrap {
    display: flex;
    justify-content: center;
    gap: 44px;
    padding: 24px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-qr-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.footer-qr-img {
    width: 90px;
    height: 90px;
    object-fit: cover;
    border-radius: 8px;
    background: var(--white);
    padding: 5px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
}

.footer-qr-label {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.45);
}

.footer-bottom-bar {
    text-align: center;
    padding: 18px 0;
    font-size: 12.5px;
    color: rgba(255, 255, 255, 0.35);
}

.footer-icp {
    color: rgba(255, 255, 255, 0.35);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-icp:hover {
    color: rgba(255, 255, 255, 0.6);
}

.footer-divider {
    margin: 0 10px;
    color: rgba(255, 255, 255, 0.15);
}

.footer-copyright {
    font-size: 12.5px;
    color: rgba(255, 255, 255, 0.35);
    margin-bottom: 0;
}

/* ============================
   返回顶部
   ============================ */
.back-to-top {
    position: fixed;
    bottom: 28px;
    right: 28px;
    width: 42px;
    height: 42px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: 0 4px 14px rgba(26, 86, 219, 0.3);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(26, 86, 219, 0.4);
}

/* ============================
   咨询弹窗
   ============================ */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--white);
    border-radius: 16px;
    padding: 40px 36px 32px;
    text-align: center;
    position: relative;
    max-width: 340px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    transform: scale(0.9) translateY(20px);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-overlay.active .modal-content {
    transform: scale(1) translateY(0);
}

.modal-close {
    position: absolute;
    top: 12px;
    right: 14px;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    font-size: 22px;
    color: #94a3b8;
    cursor: pointer;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    line-height: 1;
}

.modal-close:hover {
    background: #f1f5f9;
    color: #475569;
}

.modal-header h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--secondary);
    margin-bottom: 6px;
}

.modal-header p {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 0;
}

.modal-qr {
    margin: 24px auto;
    width: 200px;
    height: 200px;
    border-radius: 12px;
    overflow: hidden;
    background: #f8fafc;
    padding: 12px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.modal-qr img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.modal-tip {
    font-size: 12px;
    color: #94a3b8;
    margin-bottom: 0;
}

/* ============================
   响应式适配
   ============================ */
@media (max-width: 1024px) {
    .solutions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .ai-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }
    
    .header-inner {
        height: 68px;
    }
    
    .logo {
        gap: 8px;
        overflow: hidden;
    }
    
    .logo-img {
        height: 44px;
    }
    
    .logo-text-img {
        height: 28px;
    }
    
    .logo-slogan {
        font-size: 11px;
        letter-spacing: 0.5px;
    }
    
    .nav {
        position: fixed;
        top: 68px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 12px 16px;
        gap: 2px;
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
        border-bottom: 1px solid rgba(0, 0, 0, 0.06);
        transform: translateY(-120%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        padding: 12px 16px;
        width: 100%;
        text-align: center;
        border-radius: 8px;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero {
        min-height: 420px;
    }
    
    .hero-title {
        font-size: 26px;
    }
    
    .hero-tag {
        font-size: 11px;
        letter-spacing: 1px;
    }
    
    .hero-subtitle {
        font-size: 14px;
    }
    
    .hero-stats {
        flex-wrap: wrap;
    }
    
    .stat-item {
        padding: 0 20px;
    }
    
    .stat-number {
        font-size: 24px;
    }
    
    .stat-divider {
        height: 30px;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section-header {
        margin-bottom: 36px;
    }
    
    .section-title {
        font-size: 26px;
    }
    
    .section-desc {
        font-size: 14px;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 36px;
    }
    
    .about-features {
        grid-template-columns: 1fr 1fr;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .solutions-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    .ai-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-title {
        font-size: 26px;
    }
    
    .hero-btns {
        gap: 10px;
    }
    
    .hero-btns .btn {
        padding: 10px 24px;
        font-size: 14px;
    }
    
    .footer-qr-wrap {
        gap: 32px;
    }
    
    .footer-bottom-bar {
        line-height: 1.8;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    /* 触屏禁用 hover 位移 */
    .about-card:hover,
    .service-card:hover,
    .solution-card:hover,
    .ai-card:hover,
    .contact-card:hover {
        transform: none;
    }
    
    .advantage-item:hover .advantage-icon {
        box-shadow: none;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 14px;
    }
    
    .header-inner {
        height: 60px;
    }
    
    .nav {
        top: 60px;
    }
    
    .logo {
        gap: 4px;
    }
    
    .logo-slogan {
        font-size: 10px;
        margin-left: 2px;
    }
    
    .logo-img {
        height: 38px;
    }
    
    .logo-text-img {
        height: 24px;
    }
    
    .hero {
        min-height: 360px;
        padding-top: 60px;
    }
    
    .hero-content {
        padding: 20px 0;
    }
    
    .hero-title {
        font-size: 20px;
        letter-spacing: 0;
    }
    
    .hero-tag {
        font-size: 10px;
        padding: 3px 12px;
        margin-bottom: 12px;
    }
    
    .hero-subtitle {
        font-size: 12.5px;
        margin-bottom: 18px;
    }
    
    .hero-divider {
        margin: 0 auto 16px;
    }
    
    .hero-btns {
        flex-direction: column;
        align-items: center;
        gap: 10px;
        margin-bottom: 20px;
    }
    
    .hero-btns .btn {
        width: 100%;
        max-width: 220px;
        padding: 10px 20px;
        font-size: 14px;
    }
    
    .hero-circle {
        display: none;
    }
    
    .hero-stats {
        gap: 0;
    }
    
    .stat-item {
        padding: 0 14px;
    }
    
    .stat-number {
        font-size: 20px;
    }
    
    .stat-unit {
        font-size: 12px;
    }
    
    .stat-label {
        font-size: 11px;
    }
    
    .stat-divider {
        width: 1px;
        height: 28px;
    }
    
    .section {
        padding: 44px 0;
    }
    
    .section-header {
        margin-bottom: 28px;
    }
    
    .section-title {
        font-size: 22px;
    }
    
    .section-desc {
        font-size: 13px;
    }
    
    .about-content {
        gap: 24px;
    }
    
    .about-lead {
        font-size: 15px;
    }
    
    .about-text p {
        font-size: 13.5px;
    }
    
    .about-features {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .about-card {
        padding: 22px;
    }
    
    .service-card {
        padding: 24px 18px;
    }
    
    .service-icon {
        width: 48px;
        height: 48px;
    }
    
    .service-icon img {
        width: 34px;
        height: 34px;
    }
    
    .service-card h3 {
        font-size: 17px;
    }
    
    .solutions-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .solution-img {
        aspect-ratio: 16 / 9;
    }
    
    .solution-content {
        padding: 14px;
    }
    
    .solution-content h3 {
        font-size: 15px;
    }
    
    .solution-card:hover {
        transform: none;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .advantage-item {
        padding: 18px 12px;
        display: flex;
        align-items: center;
        gap: 14px;
        text-align: left;
    }
    
    .advantage-icon {
        width: 48px;
        height: 48px;
        margin: 0;
        flex-shrink: 0;
    }
    
    .advantage-item h3 {
        font-size: 15px;
        margin-bottom: 4px;
    }
    
    .advantage-item p {
        font-size: 12.5px;
    }
    
    .ai-header {
        margin-bottom: 30px;
    }
    
    .ai-header h2 {
        font-size: 22px;
    }
    
    .ai-badge {
        font-size: 11px;
        letter-spacing: 2px;
    }
    
    .ai-grid {
        gap: 14px;
    }
    
    .ai-card {
        padding: 22px 16px;
    }
    
    .ai-card h4 {
        font-size: 15px;
    }
    
    .contact-header {
        margin-bottom: 30px;
    }
    
    .contact-cards {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .contact-title {
        font-size: 22px;
    }
    
    .contact-badge {
        font-size: 11px;
        letter-spacing: 2px;
    }
    
    .contact-card {
        padding: 20px 16px;
    }
    
    .contact-card h4 {
        font-size: 12px;
    }
    
    .contact-card p {
        font-size: 14px;
    }
    
    .footer {
        padding-top: 24px;
    }
    
    .footer-qr-wrap {
        flex-direction: column;
        align-items: center;
        gap: 20px;
        padding: 20px 0;
    }
    
    .footer-qr-img {
        width: 80px;
        height: 80px;
    }
    
    .footer-bottom-bar {
        font-size: 11px;
        padding: 14px 0;
        line-height: 1.8;
    }
    
    .footer-divider {
        display: none;
    }
    
    .footer-icp,
    .footer-copyright {
        display: block;
    }
    
    .modal-content {
        padding: 28px 20px 20px;
        margin: 0 12px;
    }
    
    .modal-qr {
        width: 160px;
        height: 160px;
    }
    
    .modal-header h3 {
        font-size: 17px;
    }
    
    .back-to-top {
        width: 36px;
        height: 36px;
        bottom: 16px;
        right: 16px;
    }
}