/* 全站通用美观简洁CSS样式 */
body {
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 0;
    background: #f8f9fa;
    color: #222;
}

header {
    background: #224488;
    color: #fff;
    box-shadow: 0 2px 8px rgba(34,68,136,0.08);
}

.contact-header {
    font-size: 0.95em;
    padding: 8px 20px;
    background: #173465;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 10px;
}

.contact-header a {
    color: #fff;
    text-decoration: underline;
}

nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 20px;
}

nav .logo {
    font-size: 1.4em;
    font-weight: bold;
    color: #fff;
    text-decoration: none;
    letter-spacing: 1px;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 22px;
    margin: 0;
    padding: 0;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: 4px;
    transition: background 0.2s;
}

nav ul li a.active,
nav ul li a:hover {
    background: #5e8bff;
    color: #fff;
}

.hero {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    background: #e8eef7;
    padding: 48px 0 32px 0;
    gap: 40px;
}

.hero-img {
    width: 340px;
    max-width: 95vw;
    border-radius: 18px;
    box-shadow: 0 6px 24px rgba(34,68,136,0.13);
}

.hero-content {
    max-width: 430px;
}

.hero-content h1 {
    font-size: 2.2em;
    margin-bottom: 10px;
    color: #224488;
}

.hero-content p {
    font-size: 1.15em;
    margin-bottom: 14px;
    color: #222;
}

.btn {
    display: inline-block;
    background: #224488;
    color: #fff;
    padding: 11px 28px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.05em;
    transition: background .2s;
}

.btn:hover {
    background: #4b6ecf;
}

.features {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 32px;
    padding: 40px 10px;
    background: #fff;
}

.features div {
    flex: 1 1 230px;
    max-width: 320px;
    min-width: 210px;
    background: #f3f7ff;
    border-radius: 12px;
    padding: 24px 16px;
    text-align: center;
    box-shadow: 0 2px 12px rgba(34,68,136,0.06);
    margin: 10px 0;
}

.features img {
    width: 60px;
    margin-bottom: 12px;
}

.features h2 {
    color: #224488;
    font-size: 1.18em;
    margin: 10px 0 8px 0;
}

.features p {
    color: #444;
    font-size: 0.98em;
}

main {
    max-width: 900px;
    margin: 32px auto 18px auto;
    padding: 0 18px;
}

main img {
    width: 100%;
    max-width: 460px;
    margin: 16px auto 24px auto;
    border-radius: 14px;
    display: block;
    box-shadow: 0 2px 12px rgba(34,68,136,0.09);
}

main h1 {
    color: #224488;
    margin-top: 0;
    font-size: 2em;
}

main h2 {
    margin-top: 1.5em;
    color: #3761b8;
}

main ul, main ol {
    margin-left: 1.6em;
    margin-bottom: 1.2em;
}

main ul li, main ol li {
    margin-bottom: 0.5em;
}

form {
    background: #f8f9ff;
    border-radius: 9px;
    padding: 18px;
    box-shadow: 0 1px 8px rgba(34,68,136,0.06);
    max-width: 430px;
    margin: 18px 0;
}

form label {
    display: block;
    margin: 12px 0 5px 0;
    font-weight: 500;
}

form input, form textarea {
    width: 100%;
    border: 1px solid #b4c4e0;
    border-radius: 5px;
    padding: 7px 8px;
    font-size: 1em;
    margin-bottom: 8px;
    background: #fff;
}

form button {
    padding: 9px 24px;
    background: #224488;
    border: none;
    color: #fff;
    border-radius: 5px;
    font-weight: 600;
    cursor: pointer;
    font-size: 1em;
}

form button:hover {
    background: #4b6ecf;
}

footer {
    background: #224488;
    color: #fff;
    text-align: center;
    padding: 15px 0 13px 0;
    margin-top: 32px;
    font-size: 1em;
}

@media (max-width: 760px) {
    nav ul {
        gap: 12px;
    }
    .hero {
        flex-direction: column;
        gap: 18px;
        padding: 20px 0 18px 0;
    }
    .features {
        flex-direction: column;
        gap: 18px;
        padding: 18px 5px;
    }
    main {
        padding: 0 6px;
    }
}