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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f5f5f5;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.login-box {
    background: #ffffff;
    width: 90%;
    max-width: 380px;
    padding: 40px 20px;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    text-align: center;
}

.login-box h1 {
    color: #ffc300; /* 美团黄 */
    font-size: 28px;
    margin-bottom: 8px;
}

.sub-title {
    color: #888;
    font-size: 14px;
    margin-bottom: 30px;
}

.error-msg {
    color: #ff4d4f;
    font-size: 14px;
    margin-bottom: 15px;
    background: #fff2f0;
    padding: 8px;
    border-radius: 8px;
}

.input-group {
    margin-bottom: 16px;
}

.input-group input {
    width: 100%;
    padding: 14px 16px;
    font-size: 16px;
    border: 1px solid #e0e0e0;
    border-radius: 10px;
    background: #fafafa;
    outline: none;
    transition: all 0.3s;
}

.input-group input:focus {
    border-color: #ffc300;
    background: #ffffff;
}

.login-btn {
    width: 100%;
    padding: 14px;
    font-size: 18px;
    font-weight: bold;
    color: #ffffff;
    background-color: #ffc300; /* 美团黄 */
    border: none;
    border-radius: 10px;
    cursor: pointer;
    margin-top: 10px;
    transition: background 0.3s;
}

.login-btn:active {
    background-color: #e6b000;
}