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

body {
    background-color: #f5f3f2;
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 15vh;
}

.header-container {
    text-align: center;
    width: 100%;
    margin-bottom: 60px;
}

.main-title {
    color: #12507b;
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: 2px;
}

.sub-title {
    color: #12507b;
    font-size: 1.2rem;
    font-weight: 300;
    letter-spacing: 4px;
    opacity: 0.8;
}

.search-container {
    width: 100%;
    display: flex;
    justify-content: center;
    transition: all 0.3s ease;
}

.search-box {
    width: 40%;
    padding: 18px 25px;
    font-size: 1.1rem;
    border: 2px solid #12507b;
    border-radius: 25px;
    outline: none;
    background-color: white;
    color: #333;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 4px 12px rgba(18, 80, 123, 0.1);
    text-align: center;
}

.search-box:hover {
    width: 60%;
    border-radius: 30px;
    box-shadow: 0 6px 20px rgba(18, 80, 123, 0.15);
}

.search-box:focus {
    border-color: #12507b;
    box-shadow: 0 0 0 3px rgba(18, 80, 123, 0.2);
}

.search-box::placeholder {
    color: #999;
    font-weight: 300;
    text-align: center;
    transition: opacity 0.3s ease;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .main-title {
        font-size: 2.5rem;
    }

    .sub-title {
        font-size: 1rem;
        letter-spacing: 2px;
    }

    .search-box {
        width: 70%;
        padding: 16px 20px;
        border-radius: 20px;
    }

    .search-box:hover {
        width: 85%;
        border-radius: 25px;
    }

    body {
        padding-top: 20vh;
    }
}

@media (max-width: 480px) {
    .main-title {
        font-size: 2rem;
    }

    .sub-title {
        font-size: 0.9rem;
        letter-spacing: 1px;
    }

    .search-box {
        width: 85%;
        padding: 14px 18px;
        border-radius: 18px;
    }

    .search-box:hover {
        width: 90%;
        border-radius: 22px;
    }

    body {
        padding-top: 25vh;
    }
}

/* 添加一些装饰性元素 */
.decoration {
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(18, 80, 123, 0.05) 0%, transparent 70%);
    z-index: -1;
}

.decoration:nth-child(1) {
    top: 10%;
    left: 5%;
}

.decoration:nth-child(2) {
    bottom: 10%;
    right: 5%;
}