* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body {
    background-color: #fff;
}

/* Header Styles */
header {
    background-color: #ffffff;
    padding: 10px 15px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
}

.logo-container {
    display: flex;
    align-items: center;
}

.logo-box {
    width: 30px;
    height: 30px;
    background-color: white;
    border-radius: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 5px;
}

.logo-placeholder {
    width: 30px;
    height: 30px;
}

.logo-text {
    color: #3674FF;
    font-weight: bold;
    font-size: 18px;
}

.download-btn {
    background: linear-gradient(to right, #3674FF, #B9D9FF);
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    display: flex;
    align-items: center;
}

.go-btn {
    background-color: #ffeb3b;
    color: #333;
    border-radius: 15px;
    padding: 2px 10px;
    margin-left: 5px;
    font-weight: bold;
}

.download-btn a {
    text-decoration: none;
}

/* Main Content Styles */
main {
    padding: 20px;
    max-width: 600px;
    margin: 0 auto;
}

#login-form input[type="text"]:focus,
#login-form input[type="password"]:focus {
    border-color: #409eff;      /* 高亮边框色 */
    box-shadow: 0 0 5px #409eff33;
    outline: none;
    background-color: #f0f8ff;  /* 淡蓝色背景 */
    transition: all 0.2s;
}

.back-button {
    margin-bottom: 20px;
    cursor: pointer;
}

.welcome-text {
    font-size: 24px;
    margin-bottom: 40px;
    font-weight: bold;
}

.input-group {
    margin-bottom: 20px;
    position: relative;
}

.input-group input {
    width: 100%;
    padding: 15px 0;
    border: none;
    border-bottom: 1px solid #ddd;
    font-size: 16px;
    outline: none;
}

.input-group input::placeholder {
    color: #bbb;
}

.password-group {
    display: flex;
    align-items: center;
}

.forgot-password {
    position: absolute;
    right: 0;
    color: #999;
    text-decoration: none;
    font-size: 14px;
}

.login-btn {
    width: 100%;
    background-color: #3674FF;
    color: white;
    border: none;
    border-radius: 30px;
    padding: 15px;
    font-size: 18px;
    margin-top: 40px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.login-btn:hover {
    background-color: #3674FF;
}

.register-btn {
    display: block;
    text-align: center;
    margin-top: 20px;
    padding: 15px;
    background-color: #B9D9FF;
    color: #3674FF;
    text-decoration: none;
    border-radius: 30px;
    font-size: 16px;
    transition: background-color 0.3s;
}

.register-btn:hover {
    background-color: #ffe0e4;
}