:root {
    --primary-color: #1a73e8;
    --primary-hover: #1557b0;
    --secondary-color: #667eea;
    --accent-color: #764ba2;
    --text-primary: #1a1a2e;
    --text-secondary: #333;
    --text-muted: #555;
    --text-light: #666;
    --text-faint: #888;
    --bg-primary: #f8f9fa;
    --bg-secondary: #fff;
    --border-color: #eee;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 2px 12px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

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

html {
    scroll-behavior: smooth;
}

:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

:focus:not(:focus-visible) {
    outline: none;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text-primary);
    background: var(--bg-primary);
    line-height: 1.6;
    padding-top: 72px;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    transition: all 0.3s;
    text-align: center;
}

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

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

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

.btn-outline:hover {
    background: var(--primary-color);
    color: #fff;
}

.section-title {
    font-size: 2rem;
    margin-bottom: 8px;
}

.section-subtitle {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 32px;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    box-shadow: var(--shadow-sm);
    z-index: 100;
}

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

.logo {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 24px;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
}

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 8px;
    background: transparent;
    border: none;
    cursor: pointer;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--text-secondary);
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 72px;
    background: url('products/HR-background.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.hero h1 {
    font-size: 2.5rem;
    color: #fff;
    margin-bottom: 16px;
}

.hero .slogan {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 16px;
}

.hero .subtitle {
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 32px;
}

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

section {
    padding: 48px 0;
    scroll-margin-top: 72px;
}

.section-alt {
    background: var(--bg-secondary);
}

.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 32px;
    align-items: center;
}

.about-text p {
    margin-bottom: 16px;
    color: var(--text-muted);
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 32px;
}

.about-highlights .item {
    text-align: center;
    padding: 16px;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
}

.about-highlights .num {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.about-highlights .label {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: 4px;
}

.about-image {
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-image img {
    max-width: 100%;
    max-height: 200px;
    object-fit: contain;
}

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

.product-card {
    background: var(--bg-secondary);
    padding: 24px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all 0.3s ease;
}

.product-card .icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.product-card h3 {
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.product-card p {
    font-size: 0.9rem;
    color: var(--text-light);
}

.product-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.product-link:hover .product-card {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

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

.why-card {
    text-align: center;
    padding: 24px;
}

.why-card .emoji {
    font-size: 2.5rem;
    margin-bottom: 12px;
}

.why-card h4 {
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.why-card p {
    font-size: 0.9rem;
    color: var(--text-light);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    align-items: flex-start;
}

.contact-info h3 {
    margin-bottom: 24px;
}

.contact-info .item {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
    align-items: flex-start;
}

.contact-info .item .label {
    font-size: 0.85rem;
    color: var(--text-faint);
    margin-bottom: 2px;
}

.contact-info .item .value {
    font-size: 1rem;
    color: var(--text-secondary);
}

.contact-info .item .icon {
    font-size: 1.3rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.contact-map {
    background: #e8f4fd;
    border-radius: var(--radius-lg);
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    color: var(--text-muted);
    padding: 20px;
    text-align: center;
    line-height: 1.8;
    cursor: pointer;
    transition: all 0.3s ease;
}

.contact-map:hover {
    background: #d4eafd;
    transform: scale(1.02);
}

.contact-map a {
    display: block;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: inherit;
}

.contact-map-link {
    text-decoration: none;
    color: inherit;
}

footer {
    background: #0a4b78;
    color: rgba(255, 255, 255, 0.8);
    padding: 48px 0 24px;
    text-align: left;
}

footer .footer-content {
    display: grid !important;
    grid-template-columns: repeat(4, 1fr) !important;
    gap: 32px;
    margin-bottom: 32px;
    text-align: left !important;
}

footer .footer-brand .brand {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 12px;
}

footer .footer-brand p {
    font-size: 0.9rem;
    margin-bottom: 8px;
    opacity: 0.8;
}

footer .footer-brand .contact-info {
    font-size: 0.85rem;
    opacity: 0.7;
}

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

footer .footer-links ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

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

footer .footer-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    transition: color 0.3s;
}

footer .footer-links a:hover {
    color: #fff;
}

footer .footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    text-align: center;
}

footer .footer-bottom .copy {
    font-size: 0.85rem;
    opacity: 0.6;
    margin-bottom: 8px;
}

footer .footer-bottom .address {
    font-size: 0.8rem;
    opacity: 0.5;
}

.contact-form {
    background: var(--bg-secondary);
    padding: 24px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.contact-form h3 {
    margin-bottom: 20px;
}

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

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    transition: border-color 0.3s;
}

.contact-form input:focus,
.contact-form textarea:focus {
    border-color: var(--primary-color);
    outline: none;
}

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

.contact-form button {
    width: 100%;
    border: none;
    cursor: pointer;
}

.header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
    flex-wrap: wrap;
    gap: 16px;
}

.search-bar {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.search-bar input {
    flex: 1;
    max-width: 280px;
    padding: 10px 14px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    transition: border-color 0.3s;
}

.search-bar input:focus {
    border-color: var(--primary-color);
    outline: none;
}

.search-bar button {
    padding: 10px 16px;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.3s;
}

.search-bar button:hover {
    background: var(--secondary-color);
}

.category-tabs {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.category-tabs .tab {
    padding: 10px 24px;
    border: 2px solid var(--border-color);
    background: var(--bg-secondary);
    border-radius: 32px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.category-tabs .tab:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.category-tabs .tab.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        padding: 16px 24px;
        border-bottom: 1px solid var(--border-color);
        gap: 16px;
    }

    .nav-links.open {
        display: flex;
    }

    .hamburger {
        display: flex;
    }

    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .about-highlights {
        grid-template-columns: 1fr;
    }

    .products-grid,
    .why-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    footer .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .category-tabs {
        justify-content: center;
    }

    .category-tabs .tab {
        padding: 8px 16px;
        font-size: 0.85rem;
    }

    .hero .btn-group {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
        text-align: center;
    }
}