:root {
    --color-primary: #264e86;
    --color-accent: #0074e4;
    --color-highlight: #74dbef;
    --color-bg-light: #eff0f4;
    --color-white: #ffffff;
    --color-text: #2c3e50;
    --color-text-light: #5a6c7d;
    --color-border: #dce3ea;
    --color-footer-bg: #1a3559;
    --shadow-sm: 0 2px 8px rgba(38, 78, 134, 0.08);
    --shadow-md: 0 4px 20px rgba(38, 78, 134, 0.12);
    --shadow-lg: 0 8px 40px rgba(38, 78, 134, 0.16);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1240px;
    --nav-height: 72px;
    --nav-height-mobile: 60px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--color-text);
    background-color: var(--color-white);
    line-height: 1.7;
    min-width: 320px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* ========== 顶部导航 - 100%宽度 ========== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    width: 100%;
    height: var(--nav-height);
    background-color: var(--color-white);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border-bottom: 1px solid var(--color-border);
}

.site-header.scrolled {
    box-shadow: var(--shadow-md);
    border-bottom-color: transparent;
}

.header-inner {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    flex-shrink: 0;
    z-index: 1001;
}

.logo-img {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    object-fit: contain;
    flex-shrink: 0;
    background-color: var(--color-bg-light);
    transition: var(--transition);
}

.logo-text {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 0.5px;
    white-space: nowrap;
    line-height: 1.3;
}

.logo-text small {
    display: block;
    font-size: 0.68rem;
    font-weight: 400;
    color: var(--color-text-light);
    letter-spacing: 0.3px;
}

/* 桌面端导航 */
.main-nav {
    display: flex;
    align-items: center;
    gap: 6px;
    list-style: none;
}

.main-nav li {
    position: relative;
}

.main-nav a {
    display: block;
    padding: 10px 18px;
    text-decoration: none;
    color: var(--color-text);
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    white-space: nowrap;
    letter-spacing: 0.4px;
    position: relative;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 20px;
    height: 2.5px;
    background-color: var(--color-accent);
    border-radius: 2px;
    transition: transform 0.3s ease;
}

.main-nav a:hover {
    color: var(--color-accent);
    background-color: rgba(0, 116, 228, 0.04);
}

.main-nav a:hover::after {
    transform: translateX(-50%) scaleX(1);
}

.main-nav a.active {
    color: var(--color-accent);
    font-weight: 600;
    background-color: rgba(0, 116, 228, 0.06);
}

.main-nav a.active::after {
    transform: translateX(-50%) scaleX(1);
    width: 28px;
}

/* 移动端菜单按钮 */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
    width: 40px;
    height: 40px;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.mobile-menu-toggle:hover {
    background-color: var(--color-bg-light);
}

.mobile-menu-toggle .bar {
    display: block;
    width: 24px;
    height: 2.5px;
    background-color: var(--color-primary);
    border-radius: 3px;
    transition: var(--transition);
    transform-origin: center;
}

.mobile-menu-toggle.active .bar:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}
.mobile-menu-toggle.active .bar:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}
.mobile-menu-toggle.active .bar:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

/* ========== Hero区域 ========== */
.hero-section {
    position: relative;
    width: 100%;
    min-height: 620px;
    margin-top: var(--nav-height);
    background-color: var(--color-primary);
    overflow: hidden;
    display: flex;
    align-items: center;
}

.hero-bg-img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
    opacity: 0.45;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(160deg,
            rgba(38, 78, 134, 0.88) 0%,
            rgba(38, 78, 134, 0.7) 40%,
            rgba(0, 116, 228, 0.55) 70%,
            rgba(116, 219, 239, 0.3) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 60px 24px;
    color: var(--color-white);
}

.hero-content h1 {
    font-size: 2.6rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 18px;
    letter-spacing: 1px;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
    max-width: 700px;
}

.hero-content .hero-subtitle {
    font-size: 1.2rem;
    font-weight: 400;
    line-height: 1.6;
    margin-bottom: 32px;
    opacity: 0.93;
    max-width: 600px;
    text-shadow: 0 1px 6px rgba(0, 0, 0, 0.18);
    letter-spacing: 0.5px;
}

.hero-cta-group {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 50px;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: 0.5px;
    border: none;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--color-accent);
    color: #ffffff;
    box-shadow: 0 6px 24px rgba(0, 116, 228, 0.35);
}
.btn-primary:hover {
    background-color: #005bbf;
    box-shadow: 0 8px 32px rgba(0, 116, 228, 0.5);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    color: #ffffff;
    border: 2px solid rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(4px);
}
.btn-outline:hover {
    background-color: rgba(255, 255, 255, 0.12);
    border-color: #ffffff;
    transform: translateY(-2px);
}

/* ========== 通用区块 ========== */
.section {
    padding: 70px 24px;
    width: 100%;
}

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

.section-bg-white {
    background-color: var(--color-white);
}

.section-inner {
    max-width: var(--max-width);
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 10px;
    letter-spacing: 0.6px;
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    display: block;
    width: 56px;
    height: 3.5px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-highlight));
    margin: 12px auto 0;
    border-radius: 3px;
}

.section-header .section-desc {
    color: var(--color-text-light);
    font-size: 0.95rem;
    margin-top: 8px;
    letter-spacing: 0.3px;
}

/* ========== 关于我们 / 企业简介 ========== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.about-image-wrapper {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    aspect-ratio: 4 / 3;
    background-color: var(--color-bg-light);
}

.about-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.5s ease;
}

.about-image-wrapper:hover img {
    transform: scale(1.04);
}

.about-text h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

.about-text p {
    color: var(--color-text-light);
    font-size: 0.98rem;
    line-height: 1.8;
    margin-bottom: 14px;
    letter-spacing: 0.3px;
}

.about-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 20px;
}

.highlight-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background-color: var(--color-bg-light);
    border-left: 3px solid var(--color-accent);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--color-primary);
    letter-spacing: 0.3px;
}

/* ========== 业务范围 ========== */
.business-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.business-card {
    background-color: var(--color-white);
    border-radius: var(--radius-md);
    padding: 28px 22px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid transparent;
    position: relative;
    overflow: hidden;
}

.business-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-highlight));
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 0.4s ease;
    border-radius: 0 0 4px 4px;
}

.business-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--color-border);
}

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

.business-card .card-icon-img {
    width: 56px;
    height: 56px;
    object-fit: contain;
    margin: 0 auto 16px;
    display: block;
    border-radius: var(--radius-sm);
    background-color: var(--color-bg-light);
    padding: 8px;
    transition: var(--transition);
}

.business-card:hover .card-icon-img {
    background-color: rgba(0, 116, 228, 0.08);
}

.business-card h4 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 8px;
    letter-spacing: 0.4px;
}

.business-card p {
    font-size: 0.85rem;
    color: var(--color-text-light);
    line-height: 1.6;
    letter-spacing: 0.2px;
}

/* ========== 企业百科 ========== */
.encyclopedia-content {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    padding: 36px 32px;
    box-shadow: var(--shadow-md);
    border-left: 5px solid var(--color-accent);
}

.encyclopedia-content h3 {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

.encyclopedia-content p {
    font-size: 0.95rem;
    color: var(--color-text-light);
    line-height: 1.85;
    margin-bottom: 10px;
    letter-spacing: 0.3px;
}

.encyclopedia-content .info-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 16px;
}

.encyclopedia-content .info-pill {
    padding: 6px 14px;
    background-color: var(--color-bg-light);
    border-radius: 20px;
    font-size: 0.84rem;
    color: var(--color-primary);
    font-weight: 500;
    letter-spacing: 0.3px;
}

/* ========== 经营范围 ========== */
.scope-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
    list-style: none;
}

.scope-list li {
    background-color: var(--color-white);
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: var(--color-text);
    box-shadow: var(--shadow-sm);
    border-left: 3px solid var(--color-highlight);
    transition: var(--transition);
    letter-spacing: 0.3px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.scope-list li:hover {
    border-left-color: var(--color-accent);
    box-shadow: var(--shadow-md);
    transform: translateX(3px);
    background-color: #fafcff;
}

.scope-list li .scope-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--color-accent);
    flex-shrink: 0;
}

/* ========== 产品展示 ========== */
.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.product-card {
    background-color: var(--color-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--color-border);
}

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

.product-card .product-img-wrap {
    width: 100%;
    aspect-ratio: 16 / 11;
    overflow: hidden;
    background-color: var(--color-bg-light);
    position: relative;
}

.product-card .product-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.5s ease;
}

.product-card:hover .product-img-wrap img {
    transform: scale(1.06);
}

.product-card .product-info {
    padding: 18px 16px;
}

.product-card .product-info h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 6px;
    letter-spacing: 0.4px;
}

.product-card .product-info p {
    font-size: 0.84rem;
    color: var(--color-text-light);
    line-height: 1.5;
    letter-spacing: 0.2px;
}

/* ========== 联系方式 ========== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}

.contact-info h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 18px;
    letter-spacing: 0.5px;
}

.contact-info .contact-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 14px;
    font-size: 0.95rem;
    color: var(--color-text);
    letter-spacing: 0.3px;
    line-height: 1.6;
}

.contact-info .contact-icon {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    border-radius: 50%;
    background-color: var(--color-bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--color-accent);
    font-size: 1rem;
}

.contact-map-wrap {
    width: 100%;
    aspect-ratio: 4 / 3;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    background-color: var(--color-bg-light);
    position: relative;
}

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

/* ========== 底部导航 - 100%宽度 ========== */
.site-footer {
    width: 100%;
    background-color: var(--color-footer-bg);
    color: rgba(255, 255, 255, 0.85);
    padding: 48px 24px 24px;
}

.footer-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.2fr;
    gap: 36px;
}

.footer-col h4 {
    font-size: 1.05rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
    position: relative;
    padding-bottom: 10px;
}

.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 32px;
    height: 2.5px;
    background: linear-gradient(90deg, var(--color-highlight), var(--color-accent));
    border-radius: 2px;
}

.footer-col p,
.footer-col a {
    font-size: 0.88rem;
    line-height: 1.8;
    letter-spacing: 0.3px;
    color: rgba(255, 255, 255, 0.75);
    text-decoration: none;
    display: block;
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--color-highlight);
    padding-left: 4px;
}

.footer-bottom {
    max-width: var(--max-width);
    margin: 28px auto 0;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    text-align: center;
    font-size: 0.84rem;
    color: rgba(255, 255, 255, 0.55);
    letter-spacing: 0.3px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 16px;
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
    padding: 4px 10px;
    border-radius: 4px;
}

.footer-bottom a:hover {
    color: var(--color-highlight);
    background-color: rgba(255, 255, 255, 0.06);
}

.footer-bottom .mobile-link-highlight {
    color: var(--color-highlight);
    font-weight: 600;
    border: 1px solid rgba(116, 219, 239, 0.4);
    border-radius: 20px;
    padding: 6px 16px;
    letter-spacing: 0.4px;
}
.footer-bottom .mobile-link-highlight:hover {
    background-color: rgba(116, 219, 239, 0.1);
    border-color: var(--color-highlight);
    color: #ffffff;
}

/* ========== 响应式设计 ========== */
@media (max-width: 1024px) {
    .business-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .scope-list {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-inner {
        grid-template-columns: 1fr 1fr;
        gap: 28px;
    }
    .hero-content h1 {
        font-size: 2.1rem;
    }
    .about-grid {
        gap: 32px;
    }
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }
}

@media (max-width: 768px) {
    :root {
        --nav-height: var(--nav-height-mobile);
    }

    .site-header {
        height: var(--nav-height-mobile);
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .main-nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background-color: var(--color-white);
        flex-direction: column;
        padding: 80px 24px 40px;
        box-shadow: -4px 0 30px rgba(0, 0, 0, 0.15);
        transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        gap: 2px;
        z-index: 1000;
        overflow-y: auto;
    }

    .main-nav.active {
        right: 0;
    }

    .main-nav a {
        padding: 14px 16px;
        font-size: 1rem;
        border-radius: var(--radius-sm);
        width: 100%;
    }

    .main-nav a::after {
        display: none;
    }

    .main-nav a:hover {
        background-color: var(--color-bg-light);
    }

    /* 移动端菜单打开时的遮罩 */
    .menu-overlay {
        position: fixed;
        inset: 0;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 999;
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.35s ease;
    }
    .menu-overlay.active {
        opacity: 1;
        pointer-events: auto;
    }

    .hero-section {
        min-height: 460px;
        margin-top: var(--nav-height-mobile);
    }
    .hero-content {
        padding: 40px 20px;
    }
    .hero-content h1 {
        font-size: 1.7rem;
        letter-spacing: 0.6px;
    }
    .hero-content .hero-subtitle {
        font-size: 1rem;
    }
    .btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }

    .section {
        padding: 48px 16px;
    }
    .section-header h2 {
        font-size: 1.5rem;
    }
    .section-header {
        margin-bottom: 32px;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    .about-image-wrapper {
        aspect-ratio: 16 / 10;
        max-height: 300px;
    }

    .business-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }
    .business-card {
        padding: 20px 14px;
    }
    .business-card h4 {
        font-size: 0.92rem;
    }
    .business-card .card-icon-img {
        width: 42px;
        height: 42px;
    }

    .product-grid {
        grid-template-columns: 1fr 1fr;
        gap: 14px;
    }

    .scope-list {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }
    .scope-list li {
        font-size: 0.82rem;
        padding: 10px 12px;
    }

    .encyclopedia-content {
        padding: 24px 18px;
    }

    .footer-inner {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    .footer-bottom {
        flex-direction: column;
        gap: 10px;
    }

    .logo-text {
        font-size: 0.9rem;
    }
    .logo-img {
        width: 36px;
        height: 36px;
    }
}

@media (max-width: 480px) {
    .hero-section {
        min-height: 380px;
    }
    .hero-content h1 {
        font-size: 1.4rem;
    }
    .hero-content .hero-subtitle {
        font-size: 0.9rem;
    }
    .hero-cta-group {
        flex-direction: column;
        gap: 10px;
    }
    .btn {
        width: 100%;
        text-align: center;
        justify-content: center;
    }
    .business-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    .product-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }
    .scope-list {
        grid-template-columns: 1fr;
    }
    .section-header h2 {
        font-size: 1.3rem;
    }
    .about-text h3 {
        font-size: 1.2rem;
    }
    .encyclopedia-content h3 {
        font-size: 1.15rem;
    }
    .contact-info h3 {
        font-size: 1.2rem;
    }
    .main-nav {
        width: 260px;
    }
    .section {
        padding: 36px 12px;
    }
    .footer-bottom .mobile-link-highlight {
        font-size: 0.82rem;
        padding: 5px 12px;
    }
}

/* 图片通用响应式规则 */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* 懒加载图片占位效果 */
img[loading="lazy"] {
    background-color: var(--color-bg-light);
    transition: opacity 0.4s ease;
}

img.loaded {
    opacity: 1;
}

/* 平滑滚动偏移 */
@media (max-width: 768px) {
    html {
        scroll-padding-top: var(--nav-height-mobile);
    }
}