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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #1e2a3e;
    background-color: #ffffff;
}

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

/* header */
header {
    background: #0a2b3e;
    color: white;
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.logo h1 {
    font-size: 1.8rem;
    letter-spacing: 1px;
    margin-bottom: 4px;
}

.logo span {
    font-size: 0.8rem;
    opacity: 0.8;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 28px;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.2s;
}

nav a:hover {
    opacity: 0.7;
}

/* hero */
.hero {
    background: linear-gradient(135deg, #0f3b4f 0%, #1b5a6e 100%);
    color: white;
    text-align: center;
    padding: 80px 20px;
}

.hero h2 {
    font-size: 3rem;
    margin-bottom: 20px;
}

.slogan {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 12px;
}

.sub-slogan {
    font-size: 1.1rem;
    margin-bottom: 32px;
    opacity: 0.9;
}

.btn-primary {
    display: inline-block;
    background-color: #f59e0b;
    color: #1e2a3e;
    padding: 12px 28px;
    border-radius: 40px;
    text-decoration: none;
    font-weight: 600;
    transition: background 0.2s;
}

.btn-primary:hover {
    background-color: #e68a00;
}

/* section titles */
.section-title {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 48px;
    color: #0a2b3e;
    position: relative;
}

.section-title:after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: #f59e0b;
    margin: 12px auto 0;
}

/* values cards */
.values {
    padding: 60px 0;
    background: #f8fafc;
}

.value-cards {
    display: flex;
    gap: 30px;
    justify-content: center;
    flex-wrap: wrap;
}

.card {
    background: white;
    border-radius: 16px;
    padding: 30px 20px;
    text-align: center;
    flex: 1;
    min-width: 220px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    transition: transform 0.2s;
}

.card:hover {
    transform: translateY(-5px);
}

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

.card h4 {
    font-size: 1.4rem;
    margin-bottom: 12px;
    color: #0a2b3e;
}

/* about */
.about {
    padding: 60px 0;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    font-size: 1.05rem;
    color: #2d3e50;
}

.about-content p {
    margin-bottom: 20px;
}

/* services */
.services {
    background: #f1f5f9;
    padding: 60px 0;
}

.service-cards {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
}

.service-card {
    background: white;
    border-radius: 12px;
    padding: 28px;
    flex: 1;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.service-card h4 {
    font-size: 1.3rem;
    margin-bottom: 12px;
    color: #0f3b4f;
}

/* cases */
.cases {
    padding: 60px 0;
}

.case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.case-item {
    background: #f8fafc;
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    border-left: 4px solid #f59e0b;
}

.case-item h4 {
    margin-bottom: 12px;
    font-size: 1.2rem;
}

.more-cases {
    text-align: center;
    font-style: italic;
    color: #4a627a;
}

/* contact */
.contact {
    background: #eef2f5;
    padding: 60px 0;
    text-align: center;
}

.contact-info p {
    margin: 12px 0;
    font-size: 1.05rem;
}

.contact-note {
    margin-top: 24px;
    font-size: 0.85rem;
    color: #6c7e94;
}

/* footer */
footer {
    background: #0a2b3e;
    color: #cbd5e1;
    text-align: center;
    padding: 32px 0;
    font-size: 0.9rem;
}

footer a {
    color: #f59e0b;
    text-decoration: none;
}

/* 响应式 */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 12px;
    }
    nav ul {
        gap: 18px;
        flex-wrap: wrap;
        justify-content: center;
    }
    .hero h2 {
        font-size: 2rem;
    }
    .slogan {
        font-size: 1.2rem;
    }
    .section-title {
        font-size: 1.6rem;
    }
    .value-cards, .service-cards {
        flex-direction: column;
    }
}