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

:root {
    --primary-color: #0066cc;
    --primary-dark: #004d99;
    --primary-light: #3399ff;
    --secondary-color: #00a8a8;
    --accent-color: #ff6b35;
    --text-dark: #1a1a2e;
    --text-gray: #666666;
    --text-light: #999999;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e0e0e0;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    --transition: all 0.3s ease;
    --font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    padding-top: 64px;
}

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

ul, ol {
    list-style: none;
}

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    outline: none;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
    outline: none;
}

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

.section {
    padding: 80px 0;
}

.section-title {
    font-size: 36px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 16px;
    color: var(--text-dark);
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-gray);
    text-align: center;
    margin-bottom: 50px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 500;
    border-radius: 8px;
    transition: var(--transition);
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

.btn-accent {
    background: linear-gradient(135deg, var(--accent-color), #e55a2b);
    color: white;
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-white:hover {
    background: var(--bg-light);
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
    font-weight: bold;
}

.logo-text {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
}

.logo-text span {
    display: block;
    font-size: 12px;
    font-weight: 400;
    color: var(--text-gray);
}

.nav {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav-menu {
    display: flex;
    gap: 18px;
}

.nav-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
    position: relative;
    padding: 8px 0;
    white-space: nowrap;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

/* ========== 导航下拉菜单 ========== */
.nav-dropdown {
    position: relative;
}
.nav-dropdown-toggle {
    cursor: default;
}
.nav-submenu {
    position: absolute;
    top: 100%;
    left: -12px;
    background: white;
    min-width: 140px;
    box-shadow: 0 6px 20px rgba(0,0,0,0.12);
    border-radius: 8px;
    padding: 8px 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(6px);
    transition: all 0.2s ease;
    z-index: 1000;
    list-style: none;
}
.nav-dropdown:hover .nav-submenu {
    opacity: 1;
    visibility: visible;
    transform: translateY(4px);
}
.nav-submenu li {
    list-style: none;
}
.nav-submenu a {
    display: block;
    padding: 8px 20px;
    font-size: 13px;
    color: var(--text-dark);
    white-space: nowrap;
    transition: background 0.15s, color 0.15s;
}
.nav-submenu a:hover {
    background: var(--primary-light, #e8f4fd);
    color: var(--primary-color);
}

.header-cta {
    display: flex;
    gap: 12px;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: transparent;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    transition: var(--transition);
}

.footer {
    background: linear-gradient(180deg, #1a1a2e 0%, #0f0f1a 100%);
    color: white;
    padding: 60px 0 30px;
}

.footer-main {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.footer-logo .logo-icon {
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-color));
}

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer-contact-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    margin-bottom: 12px;
}

.footer-contact-item i {
    color: var(--primary-light);
    font-size: 16px;
}

.footer-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 24px;
    position: relative;
    padding-bottom: 12px;
}

.footer-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--primary-color);
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-light);
    padding-left: 5px;
}

.footer-qrcode {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.footer-qrcode img {
    width: 150px;
    height: auto;
    background: white;
    padding: 8px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    margin-bottom: 8px;
}

.footer-qrcode p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 13px;
    margin: 0;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-copyright {
    color: rgba(255, 255, 255, 0.5);
    font-size: 13px;
}

.footer-social {
    display: flex;
    gap: 16px;
}

.footer-social a {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 16px;
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

.floating-contact {
    position: fixed;
    right: 20px;
    bottom: 100px;
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.floating-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 22px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.floating-btn:hover {
    transform: scale(1.1);
}

.floating-phone {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

.floating-wechat {
    background: linear-gradient(135deg, #07c160, #06ad56);
}

.floating-top {
    background: var(--text-gray);
    opacity: 0;
    visibility: hidden;
}

.floating-top.visible {
    opacity: 1;
    visibility: visible;
}

.page-banner {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 140px 0 60px;
    text-align: center;
    color: white;
    position: relative;
    overflow: hidden;
}

.page-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="40" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></svg>');
    background-size: 100px;
    animation: float 20s linear infinite;
}

@keyframes float {
    0% { transform: translateX(0) translateY(0); }
    100% { transform: translateX(-100px) translateY(-100px); }
}

.page-banner h1 {
    font-size: 42px;
    font-weight: 600;
    margin-bottom: 16px;
    position: relative;
}

.page-banner p {
    font-size: 18px;
    opacity: 0.9;
    position: relative;
}

.breadcrumb {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 20px;
    font-size: 14px;
    position: relative;
}

.breadcrumb a {
    opacity: 0.8;
}

.breadcrumb a:hover {
    opacity: 1;
}

.breadcrumb span {
    opacity: 0.6;
}

.card {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.card-image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16/10;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.card:hover .card-image img {
    transform: scale(1.05);
}

.card-body {
    padding: 24px;
}

.card-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.card-desc {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.6;
}

.tag {
    display: inline-block;
    padding: 4px 12px;
    font-size: 12px;
    border-radius: 20px;
    background: var(--bg-light);
    color: var(--text-gray);
}

.tag-primary {
    background: rgba(0, 102, 204, 0.1);
    color: var(--primary-color);
}

.tag-accent {
    background: rgba(255, 107, 53, 0.1);
    color: var(--accent-color);
}

.icon-box {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 20px;
}

.icon-box-primary {
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.1), rgba(0, 168, 168, 0.1));
    color: var(--primary-color);
}

.icon-box-accent {
    background: rgba(255, 107, 53, 0.1);
    color: var(--accent-color);
}

.divider {
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
    margin: 0 auto 30px;
}

.animate-fade-in {
    animation: fadeIn 0.6s ease forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #0a1628 0%, #1a365d 50%, #0d2137 100%);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.03)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    background-size: 50px;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: radial-gradient(ellipse, rgba(0, 102, 204, 0.15) 0%, transparent 70%);
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.5; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.05); }
}

.hero .container {
    position: relative;
    z-index: 1;
    text-align: center;
    color: white;
}

.hero h1 {
    font-size: 52px;
    font-weight: 700;
    margin-bottom: 20px;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: 22px;
    opacity: 0.9;
    margin-bottom: 40px;
    font-weight: 300;
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.hero-feature {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 30px;
    font-size: 15px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.hero-feature i {
    color: var(--primary-light);
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
}

.pain-points-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.pain-point-card {
    background: white;
    padding: 40px 30px;
    border-radius: 20px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.pain-point-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.pain-point-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.pain-point-card p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.7;
}

.products-preview {
    background: var(--bg-light);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.card-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 48px;
}

.card-tag {
    position: absolute;
    top: 16px;
    left: 16px;
    padding: 6px 14px;
    background: var(--accent-color);
    color: white;
    font-size: 12px;
    font-weight: 500;
    border-radius: 20px;
}

.card-tag.tag-accent {
    background: var(--primary-color);
}

.section-cta {
    text-align: center;
    margin-top: 50px;
}

.cases-preview {
    background: white;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.case-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.case-image {
    aspect-ratio: 16/9;
    overflow: hidden;
}

.case-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 48px;
}

.case-content {
    padding: 30px;
}

.case-content h3 {
    font-size: 20px;
    margin: 12px 0;
    color: var(--text-dark);
}

.case-content p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.7;
    margin-bottom: 20px;
}

.case-stats {
    display: flex;
    gap: 30px;
    margin-bottom: 20px;
    padding: 16px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

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

.case-stat-value {
    display: block;
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
}

.case-stat-label {
    font-size: 13px;
    color: var(--text-gray);
}

.stats-section {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 60px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.stat-item {
    text-align: center;
    color: white;
}

.stat-icon {
    font-size: 36px;
    margin-bottom: 16px;
    opacity: 0.9;
}

.stat-number {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 16px;
    opacity: 0.9;
}

.partners-section {
    background: var(--bg-light);
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.partner-item {
    background: white;
    border-radius: 12px;
    padding: 30px 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.partner-item:hover {
    box-shadow: var(--shadow-md);
}

.partner-placeholder {
    color: var(--text-gray);
    font-size: 14px;
}

.certificates {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.certificate-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-gray);
}

.certificate-item i {
    color: var(--accent-color);
    font-size: 24px;
}

.cta-section {
    background: linear-gradient(135deg, #1a1a2e, #16213e);
    padding: 80px 0;
}

.cta-content {
    text-align: center;
    color: white;
}

.cta-content h2 {
    font-size: 36px;
    margin-bottom: 16px;
}

.cta-content p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 30px;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
}

.qrcode-placeholder {
    width: 120px;
    height: 120px;
    background: white;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 60px;
    color: var(--text-gray);
    margin: 0 auto 10px;
}