* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: #f5f7fb;
    padding: 20px;
    color: #1f2d3d;
}
.container {
    max-width: 600px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    overflow: hidden;
    padding: 24px;
}
h1 {
    font-size: 24px;
    text-align: center;
    margin-bottom: 24px;
    color: #1890ff;
}
.step {
    transition: all 0.3s;
}
.form-group {
    margin-bottom: 20px;
}
label {
    display: block;
    font-weight: 500;
    margin-bottom: 8px;
}
input[type="text"],
input[type="tel"] {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #dcdfe6;
    border-radius: 8px;
    font-size: 16px;
    transition: 0.2s;
}
input:focus {
    outline: none;
    border-color: #1890ff;
    box-shadow: 0 0 0 2px rgba(24,144,255,0.2);
}
.btn {
    background: #1890ff;
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    width: 100%;
    transition: background 0.2s;
}
.btn:hover {
    background: #0c7adb;
}
.btn:active {
    transform: scale(0.98);
}
.info-box {
    background: #e6f7ff;
    border-left: 4px solid #1890ff;
    padding: 12px;
    border-radius: 8px;
    margin-top: 16px;
    font-size: 14px;
}
.progress {
    margin-top: 16px;
    font-size: 14px;
    color: #52c41a;
}
.msg-box {
    margin-top: 16px;
    padding: 12px;
    border-radius: 8px;
    text-align: center;
}
.msg-error {
    background: #fff2f0;
    border: 1px solid #ffccc7;
    color: #ff4d4f;
}
.msg-success {
    background: #f6ffed;
    border: 1px solid #b7eb8f;
    color: #52c41a;
}
small {
    display: block;
    color: #909399;
    font-size: 12px;
    margin-top: 4px;
}