/* ==================== Reset & Base ==================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #1a73e8;
    --primary-dark: #1557b0;
    --primary-light: #e8f0fe;
    --accent: #00c9a7;
    --text-dark: #1f2937;
    --text-gray: #6b7280;
    --text-light: #9ca3af;
    --bg-white: #ffffff;
    --bg-light: #f9fafb;
    --bg-dark: #111827;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12);
    --radius: 12px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    color: var(--text-dark);
    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: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.section-title p {
    font-size: 1.05rem;
    color: var(--text-gray);
    max-width: 600px;
    margin: 0 auto;
}

.section-title .title-line {
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    margin: 16px auto 0;
    border-radius: 2px;
}

section {
    padding: 100px 0;
}

/* ==================== Header ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    transition: var(--transition);
    border-bottom: 1px solid transparent;
}

.header.scrolled {
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    box-shadow: var(--shadow-sm);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

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

.logo img {
    height: 40px;
    width: auto;
}

.logo span {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary);
    white-space: nowrap;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 36px;
}

.nav-links a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-gray);
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: "";
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

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

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

.nav-contact-btn {
    padding: 8px 22px;
    background: var(--primary);
    color: #fff !important;
    border-radius: 6px;
    font-size: 0.9rem;
    transition: var(--transition);
}

.nav-contact-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.nav-contact-btn::after { display: none !important; }

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

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

/* ==================== Hero ==================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #f0f7ff 0%, #e8f5e9 50%, #f0f7ff 100%);
    position: relative;
    overflow: hidden;
    padding-top: 72px;
}

.hero::before {
    content: "";
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(26, 115, 232, 0.08) 0%, transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: "";
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 201, 167, 0.06) 0%, transparent 70%);
    border-radius: 50%;
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
    position: relative;
    z-index: 1;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 24px;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.hero-content h1 .highlight {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 1.1rem;
    color: var(--text-gray);
    margin-bottom: 36px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 14px rgba(26, 115, 232, 0.35);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26, 115, 232, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--text-dark);
    border: 2px solid #e5e7eb;
}

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

.hero-visual {
    flex: 1;
    max-width: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-illustration {
    width: 100%;
    aspect-ratio: 1;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: 0 20px 60px rgba(26, 115, 232, 0.3);
    position: relative;
    overflow: hidden;
}

.hero-illustration::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-illustration .icon-large {
    font-size: 80px;
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.hero-illustration .hero-text {
    font-size: 1.4rem;
    font-weight: 600;
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 0 30px;
}

/* ==================== About ==================== */
.about {
    background: var(--bg-white);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-image {
    background: linear-gradient(135deg, var(--primary-light), #e8f5e9);
    border-radius: var(--radius);
    padding: 60px 40px;
    text-align: center;
}

.about-image .icon-large {
    font-size: 120px;
    margin-bottom: 20px;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 24px;
}

.stat-item {
    background: var(--bg-white);
    padding: 16px;
    border-radius: 8px;
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.stat-item .stat-number {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-item .stat-label {
    font-size: 0.8rem;
    color: var(--text-gray);
    margin-top: 4px;
}

.about-content h3 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.about-content p {
    color: var(--text-gray);
    line-height: 1.9;
    margin-bottom: 16px;
    font-size: 1rem;
}

.vision-box {
    margin-top: 28px;
    padding: 24px;
    background: var(--primary-light);
    border-radius: var(--radius);
    border-left: 4px solid var(--primary);
}

.vision-box h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 8px;
}

.vision-box p {
    color: var(--text-dark);
    font-weight: 500;
    margin: 0;
    font-size: 1.05rem;
}

/* ==================== Products ==================== */
.products {
    background: var(--bg-light);
}

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

.product-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 36px 28px;
    transition: var(--transition);
    border: 1px solid #f0f0f0;
    position: relative;
    overflow: hidden;
}

.product-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0);
    transition: var(--transition);
}

.product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

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

.product-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    margin-bottom: 20px;
}

.product-card:nth-child(1) .product-icon { background: #e8f0fe; }
.product-card:nth-child(2) .product-icon { background: #e8f5e9; }
.product-card:nth-child(3) .product-icon { background: #fff3e0; }
.product-card:nth-child(4) .product-icon { background: #fce4ec; }
.product-card:nth-child(5) .product-icon { background: #e3f2fd; }
.product-card:nth-child(6) .product-icon { background: #f3e5f5; }

.product-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.product-card p {
    font-size: 0.92rem;
    color: var(--text-gray);
    line-height: 1.7;
}

.product-tag {
    display: inline-block;
    margin-top: 16px;
    padding: 4px 12px;
    background: var(--bg-light);
    color: var(--primary);
    font-size: 0.8rem;
    border-radius: 4px;
    font-weight: 500;
}

/* ==================== Advantages ==================== */
.advantages {
    background: var(--bg-white);
}

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

.advantage-item {
    text-align: center;
    padding: 40px 24px;
    border-radius: var(--radius);
    transition: var(--transition);
    background: var(--bg-light);
}

.advantage-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    background: var(--bg-white);
}

.advantage-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    background: linear-gradient(135deg, var(--primary-light), #e8f5e9);
}

.advantage-item h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.advantage-item p {
    font-size: 0.88rem;
    color: var(--text-gray);
    line-height: 1.6;
}

/* ==================== Contact ==================== */
.contact {
    background: var(--bg-light);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-info h3 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.contact-info > p {
    color: var(--text-gray);
    line-height: 1.7;
}

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

.contact-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.contact-item .contact-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    border-radius: 10px;
    background: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
}

.contact-item h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 4px;
}

.contact-item p {
    font-size: 0.9rem;
    color: var(--text-gray);
    line-height: 1.5;
}

.contact-map {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    box-shadow: var(--shadow-sm);
}

.map-link {
    display: block;
    width: 100%;
    aspect-ratio: 4/3;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 20px;
    position: relative;
    background: linear-gradient(135deg, #e8f0fe 0%, #d4e8fc 100%);
    cursor: pointer;
    transition: var(--transition);
}

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

.map-link:hover .map-overlay {
    background: rgba(26, 115, 232, 0.88);
}

.map-link:hover .map-overlay span {
    color: #fff;
}

.map-static {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.map-fallback {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    background: linear-gradient(135deg, #e8f0fe 0%, #d4e8fc 100%);
}

.map-fallback span {
    font-size: 56px;
}

.map-fallback p {
    font-size: 0.95rem;
    color: var(--primary);
    font-weight: 500;
}

.map-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 14px 16px;
    background: rgba(26, 115, 232, 0.78);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    color: #fff;
    transition: var(--transition);
}

.map-overlay-icon {
    font-size: 1.1rem;
}

.contact-map .address-text {
    font-size: 0.95rem;
    color: var(--text-gray);
    text-align: center;
    line-height: 1.6;
}

/* ==================== Footer ==================== */
.footer {
    background: var(--bg-dark);
    color: #9ca3af;
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid #1f2937;
}

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-brand .logo span {
    color: #fff;
}

.footer-brand p {
    font-size: 0.9rem;
    line-height: 1.7;
    color: #9ca3af;
}

.footer-links h4,
.footer-contact h4 {
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    font-size: 0.9rem;
    color: #9ca3af;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-contact .contact-line {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.88rem;
    margin-bottom: 10px;
}

.footer-contact .contact-line span:first-child {
    font-size: 16px;
}

.seo-text {
    padding: 24px 0 0;
    border-top: 1px solid #1f2937;
}

.seo-text p {
    font-size: 0.78rem;
    line-height: 1.8;
    color: #4b5563;
    text-align: center;
}

.footer-bottom {
    padding: 24px 0;
    text-align: center;
    font-size: 0.82rem;
    color: #6b7280;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.footer-bottom a {
    color: #9ca3af;
    transition: var(--transition);
}

.footer-bottom a:hover {
    color: var(--primary);
}

/* ==================== Scroll to Top ==================== */
.scroll-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: 0 4px 14px rgba(26, 115, 232, 0.35);
    z-index: 999;
}

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

.scroll-top:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
}

/* ==================== Animations ==================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.fade-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.fade-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ==================== Responsive ==================== */
@media (max-width: 1024px) {
    .hero-content h1 { font-size: 2.4rem; }
    .products-grid { grid-template-columns: repeat(2, 1fr); }
    .advantages-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    section { padding: 70px 0; }

    .nav-links { display: none; }

    .mobile-toggle { display: flex; }

    .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--bg-white);
        padding: 24px;
        gap: 20px;
        box-shadow: var(--shadow-md);
        border-top: 1px solid #f0f0f0;
    }

    .hero .container {
        flex-direction: column;
        text-align: center;
        padding-top: 40px;
    }

    .hero-content h1 { font-size: 2rem; }
    .hero-buttons { justify-content: center; }
    .hero-visual { max-width: 300px; }

    .about-grid { grid-template-columns: 1fr; gap: 40px; }
    .products-grid { grid-template-columns: 1fr; }
    .advantages-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }

    .section-title h2 { font-size: 1.8rem; }
}