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

body {
    font-family: "Segoe UI", Arial, sans-serif;
    color: #1f2933;
    background-color: #f7fafc;
    line-height: 1.6;
}

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

a:hover {
    color: #2563eb;
}

.container {
    width: min(1100px, 90vw);
    margin: 0 auto;
}

.hero {
    background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 55%, #2563eb 100%);
    color: #ffffff;
    padding: 24px 0 120px;
    position: relative;
    overflow: hidden;
}

.hero::after {
    content: "";
    position: absolute;
    top: -120px;
    right: -120px;
    width: 240px;
    height: 240px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.15);
}

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

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

.logo-icon {
    width: 40px;
    height: 40px;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

.nav {
    display: flex;
    gap: 28px;
    font-weight: 500;
}

.nav a {
    position: relative;
}

.nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -6px;
    width: 0;
    height: 2px;
    background-color: #ffffff;
    transition: width 0.3s ease;
}

.nav a:hover::after {
    width: 100%;
}

.hero-text {
    margin-top: 80px;
}

.hero-text h1 {
    font-size: clamp(32px, 5vw, 54px);
    font-weight: 700;
    margin-bottom: 16px;
    max-width: 580px;
    white-space: nowrap; /* 防止标题折行 */
}

.hero-text p {
    font-size: 18px;
    max-width: 520px;
    margin-bottom: 28px;
}

.cta {
    display: inline-block;
    padding: 14px 30px;
    border-radius: 999px;
    background-color: #ffffff;
    color: #1e3a8a;
    font-weight: 600;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 26px rgba(37, 99, 235, 0.25);
}

.about {
    padding: 96px 0;
    background-color: #ffffff;
}

.about-grid {
    display: grid;
    gap: 32px;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.about h2 {
    font-size: 24px;
    margin-bottom: 12px;
}

.about p, .about li {
    color: #475569;
}

.about ul {
    padding-left: 18px;
    list-style-type: disc;
}

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

.section-header h2 {
    font-size: 32px;
    margin-bottom: 12px;
}

.section-header p {
    color: #475569;
    max-width: 620px;
    margin: 0 auto;
}

.products {
    padding: 96px 0;
}

.product-grid {
    display: grid;
    gap: 28px;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.product-grid article {
    background-color: #ffffff;
    border-radius: 16px;
    padding: 28px;
    box-shadow: 0 14px 32px rgba(15, 23, 42, 0.08);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.product-grid article:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 45px rgba(15, 23, 42, 0.12);
}

.product-grid h3 {
    font-size: 22px;
    margin-bottom: 14px;
}

.product-grid p {
    color: #4b5563;
}

.careers {
    padding: 96px 0;
    background-color: #0f172a;
    color: #e2e8f0;
}

.job-grid {
    display: grid;
    gap: 28px;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.job-grid article {
    background-color: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(148, 163, 184, 0.2);
    border-radius: 16px;
    padding: 28px;
    backdrop-filter: blur(6px);
}

.job-grid h3 {
    font-size: 22px;
    margin-bottom: 12px;
}

.job-grid p {
    color: #cbd5f5;
}

.job-meta {
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #94a3b8;
    margin-top: 18px;
}

.careers-footer {
    margin-top: 32px;
    text-align: center;
    color: #e2e8f0;
}

.careers-footer a {
    color: #60a5fa;
}

.careers-footer a:hover {
    color: #bfdbfe;
}

.contact {
    padding: 96px 0;
    background: linear-gradient(135deg, #e0f2fe 0%, #e2e8f0 100%);
}

.contact-card {
    display: grid;
    gap: 32px;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    background-color: #ffffff;
    border-radius: 20px;
    padding: 48px;
    box-shadow: 0 22px 50px rgba(148, 163, 184, 0.3);
}

.contact-card h2 {
    font-size: 24px;
    margin-bottom: 16px;
}

.contact-card p {
    color: #475569;
}

.footer {
    background-color: #020617;
    color: #f8fafc;
    padding: 32px 0;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
    text-align: center;
}

.footer-logo {
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

@media (max-width: 720px) {
    .hero-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
    }

    .nav {
        gap: 18px;
    }

    .hero {
        padding-bottom: 80px;
    }
}