body {
    margin: 0;
    background: linear-gradient(#e6f2ff, #ffe6f2);
    font-family: "Verdana", "Tahoma", sans-serif;
    color: #333;
}

a {
    color: #66a3ff;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.container {
    width: 900px;
    margin: 30px auto;
    background: #ffffffcc;
    border-radius: 15px;
    box-shadow: 0 0 25px #b3d9ff;
    overflow: hidden;
}

.header {
    background: linear-gradient(to right, #b3d9ff, #ffccff);
    text-align: center;
    padding: 25px;
}

.header h1 {
    margin: 0;
    font-size: 36px;
    color: #3366ff;
    text-shadow: 1px 1px 4px #ffffff;
}

.nav {
    background: #f2f7ff;
    padding: 12px;
    text-align: center;
    border-bottom: 2px solid #cce0ff;
}

.nav a {
    margin: 0 15px;
    font-weight: bold;
}

.content {
    display: flex;
}

.sidebar {
    width: 250px;
    padding: 15px;
    background: #f9fbff;
    border-right: 2px solid #e0ecff;
}

.main {
    flex: 1;
    padding: 20px;
}

.box {
    background: white;
    border-radius: 12px;
    padding: 15px;
    margin-bottom: 15px;
    box-shadow: 0 0 10px #ddeaff;
}

.box h3 {
    margin-top: 0;
    color: #ff66cc;
}

.post {
    background: #fff;
    border-radius: 12px;
    padding: 15px;
    margin-bottom: 20px;
    box-shadow: 0 0 12px #d6e6ff;
}

.post small {
    color: #999;
}

textarea, input {
    width: 100%;
    border-radius: 10px;
    border: 1px solid #ccc;
    padding: 8px;
    font-family: inherit;
}

button {
    background: linear-gradient(#99ccff, #ffb3ff);
    border: none;
    border-radius: 20px;
    padding: 8px 15px;
    cursor: pointer;
    margin-top: 5px;
}

.footer {
    text-align: center;
    padding: 10px;
    font-size: 12px;
    background: #f2f7ff;
}