/* 泰州兴东信息技术有限公司 - 企业网站样式 */
:root {
    --color-primary: #0f62fe;
    --color-primary-dark: #0043ce;
    --color-primary-light: #4589ff;
    --color-gray-100: #161616;
    --color-gray-90: #262626;
    --color-gray-80: #393939;
    --color-gray-70: #525252;
    --color-gray-50: #8d8d8d;
    --color-gray-30: #c6c6c6;
    --color-gray-20: #e0e0e0;
    --color-gray-10: #f4f4f4;
    --color-white: #ffffff;
    --font-sans: 'Source Sans 3', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --font-serif: 'Source Sans 3', 'Noto Sans SC', 'Source Han Serif CN', serif;
    --shadow-subtle: 0 2px 6px rgba(0, 0, 0, 0.08);
    --radius: 0;
    --radius-sm: 2px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--color-gray-100);
    line-height: 1.6;
    background: var(--color-white);
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header - 浅色系导航栏 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-20);
}

.nav {
    display: flex;
    align-items: center;
    height: 3rem;
    max-width: 100%;
    padding: 0 1rem;
}

/* 汉堡菜单 - 左侧 48x48px，移动端显示 */
.nav-hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 3rem;
    height: 3rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    transition: background 0.15s;
}

.nav-hamburger:hover {
    background: var(--color-gray-10);
}

.nav-hamburger span {
    width: 20px;
    height: 2px;
    background: var(--color-gray-100);
}

/* 站点名称 */
.header-name {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0 1rem 0 0;
    margin-left: 0;
    text-decoration: none;
    color: var(--color-gray-100);
}

.header-logo {
    height: 28px;
    width: 28px;
    flex-shrink: 0;
    color: var(--color-primary);
}

.header-prefix {
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

/* 导航链接 */
.nav-links {
    display: flex;
    list-style: none;
    margin-left: 2rem;
    gap: 0;
}

.nav-links li {
    display: flex;
}

.nav-links a {
    display: block;
    padding: 0 1rem;
    color: var(--color-gray-70);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 400;
    line-height: 3rem;
    transition: color 0.15s, background 0.15s;
}

.nav-links a:hover {
    color: var(--color-gray-100);
    background: var(--color-gray-10);
}

/* Banner - 浅色系主推区 */
.banner {
    background: var(--color-gray-10);
    padding: 6rem 0 5rem;
    margin-top: 3rem;
}

.banner-inner {
    max-width: 640px;
}

.banner-eyebrow {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
    letter-spacing: 0.02em;
}

.banner-title {
    font-family: var(--font-serif);
    font-size: clamp(1.75rem, 3.5vw, 2.5rem);
    font-weight: 500;
    color: var(--color-gray-100);
    line-height: 1.3;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.banner-desc {
    font-size: 1rem;
    font-weight: 400;
    color: var(--color-gray-70);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: background 0.2s;
    cursor: pointer;
    border: none;
}

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

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

/* Sections - 交替灰白背景 */
.section {
    padding: 4rem 0;
}

.section-title {
    font-family: var(--font-serif);
    font-size: 1.75rem;
    font-weight: 500;
    color: var(--color-gray-100);
    margin-bottom: 2.5rem;
    letter-spacing: -0.02em;
}

/* About - 白底 */
.about {
    background: var(--color-white);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.about-card {
    padding: 1.5rem 0;
    border-top: 3px solid var(--color-primary);
    transition: border-color 0.2s;
}

.about-card:hover {
    border-top-color: var(--color-primary-dark);
}

.about-icon {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--color-gray-70);
}

.about-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-gray-100);
    margin-bottom: 0.75rem;
}

.about-card p {
    color: var(--color-gray-70);
    font-size: 0.875rem;
    line-height: 1.6;
}

/* Services - Gray 10 背景 */
.services {
    background: var(--color-gray-10);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.service-card {
    padding: 1.5rem;
    background: var(--color-white);
    border: 1px solid var(--color-gray-20);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.service-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-subtle);
}

.service-icon {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--color-gray-70);
}

.service-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-gray-100);
    margin-bottom: 0.5rem;
}

.service-card p {
    color: var(--color-gray-70);
    font-size: 0.875rem;
    line-height: 1.5;
}

/* Contact - 浅色底 */
.contact {
    background: var(--color-white);
    border-top: 1px solid var(--color-gray-20);
}

.contact .section-title {
    color: var(--color-gray-100);
}

.contact-content {
    max-width: 640px;
}

.contact-item {
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-gray-20);
}

.contact-item:last-child {
    border-bottom: none;
}

.contact-item strong {
    display: block;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-gray-50);
    margin-bottom: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.contact-item p {
    font-size: 0.9375rem;
    color: var(--color-gray-100);
}

/* Footer - 浅色底 */
.footer {
    background: var(--color-gray-10);
    color: var(--color-gray-70);
    padding: 2rem;
    font-size: 0.8125rem;
    border-top: 1px solid var(--color-gray-20);
}

.footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Mobile Responsive */
@media (max-width: 1056px) {
    .about-grid {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 768px) {
    .nav-hamburger {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 3rem;
        left: 0;
        right: 0;
        flex-direction: column;
        margin-left: 0;
        background: var(--color-white);
        padding: 0;
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        visibility: hidden;
        transition: max-height 0.3s, opacity 0.3s, visibility 0.3s;
        border-bottom: 1px solid var(--color-gray-20);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    }

    .nav-links.active {
        max-height: 320px;
        opacity: 1;
        visibility: visible;
    }

    .nav-links li {
        border-bottom: 1px solid var(--color-gray-20);
    }

    .nav-links a {
        padding: 1rem 1.5rem;
        line-height: 1.5;
        color: var(--color-gray-100);
    }

    .nav-links a:hover {
        background: var(--color-gray-10);
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .section {
        padding: 3rem 0;
    }

    .footer .container {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }
}